From 45a8eca3a283eec00ed0394491a2d586ba4d5dc0 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Sun, 20 Oct 2019 22:08:58 +0200 Subject: [PATCH 01/10] win32/pthread: avoid name clashes with winpthread The mingw-w64 GCC seems to link implicitly to libwinpthread, which does implement a pthread emulation (that is more complete than Git's). Let's keep preferring Git's. To avoid linker errors where it thinks that the `pthread_self` and the `pthread_create` symbols are defined twice, let's give our version a `win32_` prefix, just like we already do for `pthread_join()`. Signed-off-by: Johannes Schindelin --- compat/win32/pthread.c | 4 ++-- compat/win32/pthread.h | 8 +++++--- 2 files changed, 7 insertions(+), 5 deletions(-) diff --git a/compat/win32/pthread.c b/compat/win32/pthread.c index 2e7eead42cb008..9934c7ac6fa151 100644 --- a/compat/win32/pthread.c +++ b/compat/win32/pthread.c @@ -21,7 +21,7 @@ static unsigned __stdcall win32_start_routine(void *arg) return 0; } -int pthread_create(pthread_t *thread, const void *unused, +int win32_pthread_create(pthread_t *thread, const void *unused, void *(*start_routine)(void*), void *arg) { thread->arg = arg; @@ -50,7 +50,7 @@ int win32_pthread_join(pthread_t *thread, void **value_ptr) } } -pthread_t pthread_self(void) +pthread_t win32_pthread_self(void) { pthread_t t = { NULL }; t.tid = GetCurrentThreadId(); diff --git a/compat/win32/pthread.h b/compat/win32/pthread.h index 737983d00bae91..4e57147da2e57a 100644 --- a/compat/win32/pthread.h +++ b/compat/win32/pthread.h @@ -50,8 +50,9 @@ typedef struct { DWORD tid; } pthread_t; -int pthread_create(pthread_t *thread, const void *unused, - void *(*start_routine)(void*), void *arg); +int win32_pthread_create(pthread_t *thread, const void *unused, + void *(*start_routine)(void*), void *arg); +#define pthread_create win32_pthread_create /* * To avoid the need of copying a struct, we use small macro wrapper to pass @@ -62,7 +63,8 @@ int pthread_create(pthread_t *thread, const void *unused, int win32_pthread_join(pthread_t *thread, void **value_ptr); #define pthread_equal(t1, t2) ((t1).tid == (t2).tid) -pthread_t pthread_self(void); +pthread_t win32_pthread_self(void); +#define pthread_self win32_pthread_self static inline void NORETURN pthread_exit(void *ret) { From 9e7f6ddea2f6bc299335d085244339d045c69227 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Fri, 12 Aug 2022 12:44:15 +0200 Subject: [PATCH 02/10] git-compat-util: avoid redeclaring _DEFAULT_SOURCE We are about to vendor in `mimalloc`'s source code which we will want to include `git-compat-util.h` after defining that constant. Signed-off-by: Johannes Schindelin --- git-compat-util.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/git-compat-util.h b/git-compat-util.h index 31d627fb40a58f..d78d5e363ed88f 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -185,7 +185,9 @@ struct strbuf; #define _ALL_SOURCE 1 #define _GNU_SOURCE 1 #define _BSD_SOURCE 1 +#ifndef _DEFAULT_SOURCE #define _DEFAULT_SOURCE 1 +#endif #define _NETBSD_SOURCE 1 #define _SGI_SOURCE 1 From ce055a3bcfc553aba6988b72bcdf8c9154df917d Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Mon, 24 Jun 2019 21:31:30 +0200 Subject: [PATCH 03/10] Import the source code of mimalloc This commit imports mimalloc's source code as per v2.0.6, fetched from the tag at https://github.com/microsoft/mimalloc. The .c files are from the src/ subdirectory, and the .h files from the include/ subdirectory. We will subsequently modify the source code to accommodate building within Git's context. Since we plan on using the `mi_*()` family of functions, we skip the C++-specific source code, some POSIX compliant functions to interact with mimalloc, and the code that wants to support auto-magic overriding of the `malloc()` function (mimalloc-new-delete.h, alloc-posix.c, mimalloc-override.h, alloc-override.c, alloc-override-osx.c, alloc-override-win.c and static.c). To appease the `check-whitespace` job of Git's Continuous Integration, this commit was washed one time via `git rebase --whitespace=fix`. Signed-off-by: Johannes Schindelin --- Makefile | 1 + compat/mimalloc/LICENSE | 21 + compat/mimalloc/alloc-aligned.c | 260 +++++ compat/mimalloc/alloc.c | 934 ++++++++++++++++ compat/mimalloc/arena.c | 446 ++++++++ compat/mimalloc/bitmap.c | 395 +++++++ compat/mimalloc/bitmap.h | 107 ++ compat/mimalloc/heap.c | 580 ++++++++++ compat/mimalloc/init.c | 693 ++++++++++++ compat/mimalloc/mimalloc-atomic.h | 338 ++++++ compat/mimalloc/mimalloc-internal.h | 1049 ++++++++++++++++++ compat/mimalloc/mimalloc-types.h | 598 +++++++++++ compat/mimalloc/mimalloc.h | 453 ++++++++ compat/mimalloc/options.c | 627 +++++++++++ compat/mimalloc/os.c | 1443 +++++++++++++++++++++++++ compat/mimalloc/page-queue.c | 331 ++++++ compat/mimalloc/page.c | 869 +++++++++++++++ compat/mimalloc/random.c | 367 +++++++ compat/mimalloc/readme.md | 715 +++++++++++++ compat/mimalloc/segment-cache.c | 360 +++++++ compat/mimalloc/segment.c | 1542 +++++++++++++++++++++++++++ compat/mimalloc/stats.c | 583 ++++++++++ 22 files changed, 12712 insertions(+) create mode 100644 compat/mimalloc/LICENSE create mode 100644 compat/mimalloc/alloc-aligned.c create mode 100644 compat/mimalloc/alloc.c create mode 100644 compat/mimalloc/arena.c create mode 100644 compat/mimalloc/bitmap.c create mode 100644 compat/mimalloc/bitmap.h create mode 100644 compat/mimalloc/heap.c create mode 100644 compat/mimalloc/init.c create mode 100644 compat/mimalloc/mimalloc-atomic.h create mode 100644 compat/mimalloc/mimalloc-internal.h create mode 100644 compat/mimalloc/mimalloc-types.h create mode 100644 compat/mimalloc/mimalloc.h create mode 100644 compat/mimalloc/options.c create mode 100644 compat/mimalloc/os.c create mode 100644 compat/mimalloc/page-queue.c create mode 100644 compat/mimalloc/page.c create mode 100644 compat/mimalloc/random.c create mode 100644 compat/mimalloc/readme.md create mode 100644 compat/mimalloc/segment-cache.c create mode 100644 compat/mimalloc/segment.c create mode 100644 compat/mimalloc/stats.c diff --git a/Makefile b/Makefile index 117652ca651da8..513d2308b0b5fa 100644 --- a/Makefile +++ b/Makefile @@ -1246,6 +1246,7 @@ BUILTIN_OBJS += builtin/write-tree.o # upstream unnecessarily (making merging in future changes easier). THIRD_PARTY_SOURCES += compat/inet_ntop.c THIRD_PARTY_SOURCES += compat/inet_pton.c +THIRD_PARTY_SOURCES += compat/mimalloc/% THIRD_PARTY_SOURCES += compat/nedmalloc/% THIRD_PARTY_SOURCES += compat/obstack.% THIRD_PARTY_SOURCES += compat/poll/% diff --git a/compat/mimalloc/LICENSE b/compat/mimalloc/LICENSE new file mode 100644 index 00000000000000..670b668a0c928e --- /dev/null +++ b/compat/mimalloc/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2018-2021 Microsoft Corporation, Daan Leijen + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/compat/mimalloc/alloc-aligned.c b/compat/mimalloc/alloc-aligned.c new file mode 100644 index 00000000000000..5594b6d38387d2 --- /dev/null +++ b/compat/mimalloc/alloc-aligned.c @@ -0,0 +1,260 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +#include "mimalloc.h" +#include "mimalloc-internal.h" + +#include // memset + +// ------------------------------------------------------ +// Aligned Allocation +// ------------------------------------------------------ + +// Fallback primitive aligned allocation -- split out for better codegen +static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_fallback(mi_heap_t* const heap, const size_t size, const size_t alignment, const size_t offset, const bool zero) mi_attr_noexcept +{ + mi_assert_internal(size <= PTRDIFF_MAX); + mi_assert_internal(alignment!=0 && _mi_is_power_of_two(alignment) && alignment <= MI_ALIGNMENT_MAX); + + const uintptr_t align_mask = alignment-1; // for any x, `(x & align_mask) == (x % alignment)` + const size_t padsize = size + MI_PADDING_SIZE; + + // use regular allocation if it is guaranteed to fit the alignment constraints + if (offset==0 && alignment<=padsize && padsize<=MI_MAX_ALIGN_GUARANTEE && (padsize&align_mask)==0) { + void* p = _mi_heap_malloc_zero(heap, size, zero); + mi_assert_internal(p == NULL || ((uintptr_t)p % alignment) == 0); + return p; + } + + // otherwise over-allocate + void* p = _mi_heap_malloc_zero(heap, size + alignment - 1, zero); + if (p == NULL) return NULL; + + // .. and align within the allocation + uintptr_t adjust = alignment - (((uintptr_t)p + offset) & align_mask); + mi_assert_internal(adjust <= alignment); + void* aligned_p = (adjust == alignment ? p : (void*)((uintptr_t)p + adjust)); + if (aligned_p != p) mi_page_set_has_aligned(_mi_ptr_page(p), true); + mi_assert_internal(((uintptr_t)aligned_p + offset) % alignment == 0); + mi_assert_internal(p == _mi_page_ptr_unalign(_mi_ptr_segment(aligned_p), _mi_ptr_page(aligned_p), aligned_p)); + return aligned_p; +} + +// Primitive aligned allocation +static void* mi_heap_malloc_zero_aligned_at(mi_heap_t* const heap, const size_t size, const size_t alignment, const size_t offset, const bool zero) mi_attr_noexcept +{ + // note: we don't require `size > offset`, we just guarantee that the address at offset is aligned regardless of the allocated size. + mi_assert(alignment > 0); + if (mi_unlikely(alignment==0 || !_mi_is_power_of_two(alignment))) { // require power-of-two (see ) + #if MI_DEBUG > 0 + _mi_error_message(EOVERFLOW, "aligned allocation requires the alignment to be a power-of-two (size %zu, alignment %zu)\n", size, alignment); + #endif + return NULL; + } + if (mi_unlikely(alignment > MI_ALIGNMENT_MAX)) { // we cannot align at a boundary larger than this (or otherwise we cannot find segment headers) + #if MI_DEBUG > 0 + _mi_error_message(EOVERFLOW, "aligned allocation has a maximum alignment of %zu (size %zu, alignment %zu)\n", MI_ALIGNMENT_MAX, size, alignment); + #endif + return NULL; + } + if (mi_unlikely(size > PTRDIFF_MAX)) { // we don't allocate more than PTRDIFF_MAX (see ) + #if MI_DEBUG > 0 + _mi_error_message(EOVERFLOW, "aligned allocation request is too large (size %zu, alignment %zu)\n", size, alignment); + #endif + return NULL; + } + const uintptr_t align_mask = alignment-1; // for any x, `(x & align_mask) == (x % alignment)` + const size_t padsize = size + MI_PADDING_SIZE; // note: cannot overflow due to earlier size > PTRDIFF_MAX check + + // try first if there happens to be a small block available with just the right alignment + if (mi_likely(padsize <= MI_SMALL_SIZE_MAX)) { + mi_page_t* page = _mi_heap_get_free_small_page(heap, padsize); + const bool is_aligned = (((uintptr_t)page->free+offset) & align_mask)==0; + if (mi_likely(page->free != NULL && is_aligned)) + { + #if MI_STAT>1 + mi_heap_stat_increase(heap, malloc, size); + #endif + void* p = _mi_page_malloc(heap, page, padsize); // TODO: inline _mi_page_malloc + mi_assert_internal(p != NULL); + mi_assert_internal(((uintptr_t)p + offset) % alignment == 0); + if (zero) { _mi_block_zero_init(page, p, size); } + return p; + } + } + // fallback + return mi_heap_malloc_zero_aligned_at_fallback(heap, size, alignment, offset, zero); +} + + +// ------------------------------------------------------ +// Optimized mi_heap_malloc_aligned / mi_malloc_aligned +// ------------------------------------------------------ + +mi_decl_restrict void* mi_heap_malloc_aligned_at(mi_heap_t* heap, size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_malloc_zero_aligned_at(heap, size, alignment, offset, false); +} + +mi_decl_restrict void* mi_heap_malloc_aligned(mi_heap_t* heap, size_t size, size_t alignment) mi_attr_noexcept { + #if !MI_PADDING + // without padding, any small sized allocation is naturally aligned (see also `_mi_segment_page_start`) + if (!_mi_is_power_of_two(alignment)) return NULL; + if (mi_likely(_mi_is_power_of_two(size) && size >= alignment && size <= MI_SMALL_SIZE_MAX)) + #else + // with padding, we can only guarantee this for fixed alignments + if (mi_likely((alignment == sizeof(void*) || (alignment == MI_MAX_ALIGN_SIZE && size > (MI_MAX_ALIGN_SIZE/2))) + && size <= MI_SMALL_SIZE_MAX)) + #endif + { + // fast path for common alignment and size + return mi_heap_malloc_small(heap, size); + } + else { + return mi_heap_malloc_aligned_at(heap, size, alignment, 0); + } +} + +// ------------------------------------------------------ +// Aligned Allocation +// ------------------------------------------------------ + +mi_decl_restrict void* mi_heap_zalloc_aligned_at(mi_heap_t* heap, size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_malloc_zero_aligned_at(heap, size, alignment, offset, true); +} + +mi_decl_restrict void* mi_heap_zalloc_aligned(mi_heap_t* heap, size_t size, size_t alignment) mi_attr_noexcept { + return mi_heap_zalloc_aligned_at(heap, size, alignment, 0); +} + +mi_decl_restrict void* mi_heap_calloc_aligned_at(mi_heap_t* heap, size_t count, size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + size_t total; + if (mi_count_size_overflow(count, size, &total)) return NULL; + return mi_heap_zalloc_aligned_at(heap, total, alignment, offset); +} + +mi_decl_restrict void* mi_heap_calloc_aligned(mi_heap_t* heap, size_t count, size_t size, size_t alignment) mi_attr_noexcept { + return mi_heap_calloc_aligned_at(heap,count,size,alignment,0); +} + +mi_decl_restrict void* mi_malloc_aligned_at(size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_malloc_aligned_at(mi_get_default_heap(), size, alignment, offset); +} + +mi_decl_restrict void* mi_malloc_aligned(size_t size, size_t alignment) mi_attr_noexcept { + return mi_heap_malloc_aligned(mi_get_default_heap(), size, alignment); +} + +mi_decl_restrict void* mi_zalloc_aligned_at(size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_zalloc_aligned_at(mi_get_default_heap(), size, alignment, offset); +} + +mi_decl_restrict void* mi_zalloc_aligned(size_t size, size_t alignment) mi_attr_noexcept { + return mi_heap_zalloc_aligned(mi_get_default_heap(), size, alignment); +} + +mi_decl_restrict void* mi_calloc_aligned_at(size_t count, size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_calloc_aligned_at(mi_get_default_heap(), count, size, alignment, offset); +} + +mi_decl_restrict void* mi_calloc_aligned(size_t count, size_t size, size_t alignment) mi_attr_noexcept { + return mi_heap_calloc_aligned(mi_get_default_heap(), count, size, alignment); +} + + +// ------------------------------------------------------ +// Aligned re-allocation +// ------------------------------------------------------ + +static void* mi_heap_realloc_zero_aligned_at(mi_heap_t* heap, void* p, size_t newsize, size_t alignment, size_t offset, bool zero) mi_attr_noexcept { + mi_assert(alignment > 0); + if (alignment <= sizeof(uintptr_t)) return _mi_heap_realloc_zero(heap,p,newsize,zero); + if (p == NULL) return mi_heap_malloc_zero_aligned_at(heap,newsize,alignment,offset,zero); + size_t size = mi_usable_size(p); + if (newsize <= size && newsize >= (size - (size / 2)) + && (((uintptr_t)p + offset) % alignment) == 0) { + return p; // reallocation still fits, is aligned and not more than 50% waste + } + else { + void* newp = mi_heap_malloc_aligned_at(heap,newsize,alignment,offset); + if (newp != NULL) { + if (zero && newsize > size) { + const mi_page_t* page = _mi_ptr_page(newp); + if (page->is_zero) { + // already zero initialized + mi_assert_expensive(mi_mem_is_zero(newp,newsize)); + } + else { + // also set last word in the previous allocation to zero to ensure any padding is zero-initialized + size_t start = (size >= sizeof(intptr_t) ? size - sizeof(intptr_t) : 0); + memset((uint8_t*)newp + start, 0, newsize - start); + } + } + _mi_memcpy_aligned(newp, p, (newsize > size ? size : newsize)); + mi_free(p); // only free if successful + } + return newp; + } +} + +static void* mi_heap_realloc_zero_aligned(mi_heap_t* heap, void* p, size_t newsize, size_t alignment, bool zero) mi_attr_noexcept { + mi_assert(alignment > 0); + if (alignment <= sizeof(uintptr_t)) return _mi_heap_realloc_zero(heap,p,newsize,zero); + size_t offset = ((uintptr_t)p % alignment); // use offset of previous allocation (p can be NULL) + return mi_heap_realloc_zero_aligned_at(heap,p,newsize,alignment,offset,zero); +} + +void* mi_heap_realloc_aligned_at(mi_heap_t* heap, void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_realloc_zero_aligned_at(heap,p,newsize,alignment,offset,false); +} + +void* mi_heap_realloc_aligned(mi_heap_t* heap, void* p, size_t newsize, size_t alignment) mi_attr_noexcept { + return mi_heap_realloc_zero_aligned(heap,p,newsize,alignment,false); +} + +void* mi_heap_rezalloc_aligned_at(mi_heap_t* heap, void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_realloc_zero_aligned_at(heap, p, newsize, alignment, offset, true); +} + +void* mi_heap_rezalloc_aligned(mi_heap_t* heap, void* p, size_t newsize, size_t alignment) mi_attr_noexcept { + return mi_heap_realloc_zero_aligned(heap, p, newsize, alignment, true); +} + +void* mi_heap_recalloc_aligned_at(mi_heap_t* heap, void* p, size_t newcount, size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + size_t total; + if (mi_count_size_overflow(newcount, size, &total)) return NULL; + return mi_heap_rezalloc_aligned_at(heap, p, total, alignment, offset); +} + +void* mi_heap_recalloc_aligned(mi_heap_t* heap, void* p, size_t newcount, size_t size, size_t alignment) mi_attr_noexcept { + size_t total; + if (mi_count_size_overflow(newcount, size, &total)) return NULL; + return mi_heap_rezalloc_aligned(heap, p, total, alignment); +} + +void* mi_realloc_aligned_at(void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_realloc_aligned_at(mi_get_default_heap(), p, newsize, alignment, offset); +} + +void* mi_realloc_aligned(void* p, size_t newsize, size_t alignment) mi_attr_noexcept { + return mi_heap_realloc_aligned(mi_get_default_heap(), p, newsize, alignment); +} + +void* mi_rezalloc_aligned_at(void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_rezalloc_aligned_at(mi_get_default_heap(), p, newsize, alignment, offset); +} + +void* mi_rezalloc_aligned(void* p, size_t newsize, size_t alignment) mi_attr_noexcept { + return mi_heap_rezalloc_aligned(mi_get_default_heap(), p, newsize, alignment); +} + +void* mi_recalloc_aligned_at(void* p, size_t newcount, size_t size, size_t alignment, size_t offset) mi_attr_noexcept { + return mi_heap_recalloc_aligned_at(mi_get_default_heap(), p, newcount, size, alignment, offset); +} + +void* mi_recalloc_aligned(void* p, size_t newcount, size_t size, size_t alignment) mi_attr_noexcept { + return mi_heap_recalloc_aligned(mi_get_default_heap(), p, newcount, size, alignment); +} diff --git a/compat/mimalloc/alloc.c b/compat/mimalloc/alloc.c new file mode 100644 index 00000000000000..70d74cb95790e8 --- /dev/null +++ b/compat/mimalloc/alloc.c @@ -0,0 +1,934 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2022, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#ifndef _DEFAULT_SOURCE +#define _DEFAULT_SOURCE // for realpath() on Linux +#endif + +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include // memset, strlen +#include // malloc, exit + +#define MI_IN_ALLOC_C +#include "alloc-override.c" +#undef MI_IN_ALLOC_C + +// ------------------------------------------------------ +// Allocation +// ------------------------------------------------------ + +// Fast allocation in a page: just pop from the free list. +// Fall back to generic allocation only if the list is empty. +extern inline void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t size) mi_attr_noexcept { + mi_assert_internal(page->xblock_size==0||mi_page_block_size(page) >= size); + mi_block_t* const block = page->free; + if (mi_unlikely(block == NULL)) { + return _mi_malloc_generic(heap, size); + } + mi_assert_internal(block != NULL && _mi_ptr_page(block) == page); + // pop from the free list + page->used++; + page->free = mi_block_next(page, block); + mi_assert_internal(page->free == NULL || _mi_ptr_page(page->free) == page); + +#if (MI_DEBUG>0) + if (!page->is_zero) { memset(block, MI_DEBUG_UNINIT, size); } +#elif (MI_SECURE!=0) + block->next = 0; // don't leak internal data +#endif + +#if (MI_STAT>0) + const size_t bsize = mi_page_usable_block_size(page); + if (bsize <= MI_MEDIUM_OBJ_SIZE_MAX) { + mi_heap_stat_increase(heap, normal, bsize); + mi_heap_stat_counter_increase(heap, normal_count, 1); +#if (MI_STAT>1) + const size_t bin = _mi_bin(bsize); + mi_heap_stat_increase(heap, normal_bins[bin], 1); +#endif + } +#endif + +#if (MI_PADDING > 0) && defined(MI_ENCODE_FREELIST) + mi_padding_t* const padding = (mi_padding_t*)((uint8_t*)block + mi_page_usable_block_size(page)); + ptrdiff_t delta = ((uint8_t*)padding - (uint8_t*)block - (size - MI_PADDING_SIZE)); + mi_assert_internal(delta >= 0 && mi_page_usable_block_size(page) >= (size - MI_PADDING_SIZE + delta)); + padding->canary = (uint32_t)(mi_ptr_encode(page,block,page->keys)); + padding->delta = (uint32_t)(delta); + uint8_t* fill = (uint8_t*)padding - delta; + const size_t maxpad = (delta > MI_MAX_ALIGN_SIZE ? MI_MAX_ALIGN_SIZE : delta); // set at most N initial padding bytes + for (size_t i = 0; i < maxpad; i++) { fill[i] = MI_DEBUG_PADDING; } +#endif + + return block; +} + +// allocate a small block +extern inline mi_decl_restrict void* mi_heap_malloc_small(mi_heap_t* heap, size_t size) mi_attr_noexcept { + mi_assert(heap!=NULL); + mi_assert(heap->thread_id == 0 || heap->thread_id == _mi_thread_id()); // heaps are thread local + mi_assert(size <= MI_SMALL_SIZE_MAX); + #if (MI_PADDING) + if (size == 0) { + size = sizeof(void*); + } + #endif + mi_page_t* page = _mi_heap_get_free_small_page(heap,size + MI_PADDING_SIZE); + void* p = _mi_page_malloc(heap, page, size + MI_PADDING_SIZE); + mi_assert_internal(p==NULL || mi_usable_size(p) >= size); + #if MI_STAT>1 + if (p != NULL) { + if (!mi_heap_is_initialized(heap)) { heap = mi_get_default_heap(); } + mi_heap_stat_increase(heap, malloc, mi_usable_size(p)); + } + #endif + return p; +} + +extern inline mi_decl_restrict void* mi_malloc_small(size_t size) mi_attr_noexcept { + return mi_heap_malloc_small(mi_get_default_heap(), size); +} + +// The main allocation function +extern inline mi_decl_restrict void* mi_heap_malloc(mi_heap_t* heap, size_t size) mi_attr_noexcept { + if (mi_likely(size <= MI_SMALL_SIZE_MAX)) { + return mi_heap_malloc_small(heap, size); + } + else { + mi_assert(heap!=NULL); + mi_assert(heap->thread_id == 0 || heap->thread_id == _mi_thread_id()); // heaps are thread local + void* const p = _mi_malloc_generic(heap, size + MI_PADDING_SIZE); // note: size can overflow but it is detected in malloc_generic + mi_assert_internal(p == NULL || mi_usable_size(p) >= size); + #if MI_STAT>1 + if (p != NULL) { + if (!mi_heap_is_initialized(heap)) { heap = mi_get_default_heap(); } + mi_heap_stat_increase(heap, malloc, mi_usable_size(p)); + } + #endif + return p; + } +} + +extern inline mi_decl_restrict void* mi_malloc(size_t size) mi_attr_noexcept { + return mi_heap_malloc(mi_get_default_heap(), size); +} + + +void _mi_block_zero_init(const mi_page_t* page, void* p, size_t size) { + // note: we need to initialize the whole usable block size to zero, not just the requested size, + // or the recalloc/rezalloc functions cannot safely expand in place (see issue #63) + MI_UNUSED(size); + mi_assert_internal(p != NULL); + mi_assert_internal(mi_usable_size(p) >= size); // size can be zero + mi_assert_internal(_mi_ptr_page(p)==page); + if (page->is_zero && size > sizeof(mi_block_t)) { + // already zero initialized memory + ((mi_block_t*)p)->next = 0; // clear the free list pointer + mi_assert_expensive(mi_mem_is_zero(p, mi_usable_size(p))); + } + else { + // otherwise memset + memset(p, 0, mi_usable_size(p)); + } +} + +// zero initialized small block +mi_decl_restrict void* mi_zalloc_small(size_t size) mi_attr_noexcept { + void* p = mi_malloc_small(size); + if (p != NULL) { + _mi_block_zero_init(_mi_ptr_page(p), p, size); // todo: can we avoid getting the page again? + } + return p; +} + +void* _mi_heap_malloc_zero(mi_heap_t* heap, size_t size, bool zero) mi_attr_noexcept { + void* p = mi_heap_malloc(heap,size); + if (zero && p != NULL) { + _mi_block_zero_init(_mi_ptr_page(p),p,size); // todo: can we avoid getting the page again? + } + return p; +} + +extern inline mi_decl_restrict void* mi_heap_zalloc(mi_heap_t* heap, size_t size) mi_attr_noexcept { + return _mi_heap_malloc_zero(heap, size, true); +} + +mi_decl_restrict void* mi_zalloc(size_t size) mi_attr_noexcept { + return mi_heap_zalloc(mi_get_default_heap(),size); +} + + +// ------------------------------------------------------ +// Check for double free in secure and debug mode +// This is somewhat expensive so only enabled for secure mode 4 +// ------------------------------------------------------ + +#if (MI_ENCODE_FREELIST && (MI_SECURE>=4 || MI_DEBUG!=0)) +// linear check if the free list contains a specific element +static bool mi_list_contains(const mi_page_t* page, const mi_block_t* list, const mi_block_t* elem) { + while (list != NULL) { + if (elem==list) return true; + list = mi_block_next(page, list); + } + return false; +} + +static mi_decl_noinline bool mi_check_is_double_freex(const mi_page_t* page, const mi_block_t* block) { + // The decoded value is in the same page (or NULL). + // Walk the free lists to verify positively if it is already freed + if (mi_list_contains(page, page->free, block) || + mi_list_contains(page, page->local_free, block) || + mi_list_contains(page, mi_page_thread_free(page), block)) + { + _mi_error_message(EAGAIN, "double free detected of block %p with size %zu\n", block, mi_page_block_size(page)); + return true; + } + return false; +} + +static inline bool mi_check_is_double_free(const mi_page_t* page, const mi_block_t* block) { + mi_block_t* n = mi_block_nextx(page, block, page->keys); // pretend it is freed, and get the decoded first field + if (((uintptr_t)n & (MI_INTPTR_SIZE-1))==0 && // quick check: aligned pointer? + (n==NULL || mi_is_in_same_page(block, n))) // quick check: in same page or NULL? + { + // Suspicous: decoded value a in block is in the same page (or NULL) -- maybe a double free? + // (continue in separate function to improve code generation) + return mi_check_is_double_freex(page, block); + } + return false; +} +#else +static inline bool mi_check_is_double_free(const mi_page_t* page, const mi_block_t* block) { + MI_UNUSED(page); + MI_UNUSED(block); + return false; +} +#endif + +// --------------------------------------------------------------------------- +// Check for heap block overflow by setting up padding at the end of the block +// --------------------------------------------------------------------------- + +#if (MI_PADDING>0) && defined(MI_ENCODE_FREELIST) +static bool mi_page_decode_padding(const mi_page_t* page, const mi_block_t* block, size_t* delta, size_t* bsize) { + *bsize = mi_page_usable_block_size(page); + const mi_padding_t* const padding = (mi_padding_t*)((uint8_t*)block + *bsize); + *delta = padding->delta; + return ((uint32_t)mi_ptr_encode(page,block,page->keys) == padding->canary && *delta <= *bsize); +} + +// Return the exact usable size of a block. +static size_t mi_page_usable_size_of(const mi_page_t* page, const mi_block_t* block) { + size_t bsize; + size_t delta; + bool ok = mi_page_decode_padding(page, block, &delta, &bsize); + mi_assert_internal(ok); mi_assert_internal(delta <= bsize); + return (ok ? bsize - delta : 0); +} + +static bool mi_verify_padding(const mi_page_t* page, const mi_block_t* block, size_t* size, size_t* wrong) { + size_t bsize; + size_t delta; + bool ok = mi_page_decode_padding(page, block, &delta, &bsize); + *size = *wrong = bsize; + if (!ok) return false; + mi_assert_internal(bsize >= delta); + *size = bsize - delta; + uint8_t* fill = (uint8_t*)block + bsize - delta; + const size_t maxpad = (delta > MI_MAX_ALIGN_SIZE ? MI_MAX_ALIGN_SIZE : delta); // check at most the first N padding bytes + for (size_t i = 0; i < maxpad; i++) { + if (fill[i] != MI_DEBUG_PADDING) { + *wrong = bsize - delta + i; + return false; + } + } + return true; +} + +static void mi_check_padding(const mi_page_t* page, const mi_block_t* block) { + size_t size; + size_t wrong; + if (!mi_verify_padding(page,block,&size,&wrong)) { + _mi_error_message(EFAULT, "buffer overflow in heap block %p of size %zu: write after %zu bytes\n", block, size, wrong ); + } +} + +// When a non-thread-local block is freed, it becomes part of the thread delayed free +// list that is freed later by the owning heap. If the exact usable size is too small to +// contain the pointer for the delayed list, then shrink the padding (by decreasing delta) +// so it will later not trigger an overflow error in `mi_free_block`. +static void mi_padding_shrink(const mi_page_t* page, const mi_block_t* block, const size_t min_size) { + size_t bsize; + size_t delta; + bool ok = mi_page_decode_padding(page, block, &delta, &bsize); + mi_assert_internal(ok); + if (!ok || (bsize - delta) >= min_size) return; // usually already enough space + mi_assert_internal(bsize >= min_size); + if (bsize < min_size) return; // should never happen + size_t new_delta = (bsize - min_size); + mi_assert_internal(new_delta < bsize); + mi_padding_t* padding = (mi_padding_t*)((uint8_t*)block + bsize); + padding->delta = (uint32_t)new_delta; +} +#else +static void mi_check_padding(const mi_page_t* page, const mi_block_t* block) { + MI_UNUSED(page); + MI_UNUSED(block); +} + +static size_t mi_page_usable_size_of(const mi_page_t* page, const mi_block_t* block) { + MI_UNUSED(block); + return mi_page_usable_block_size(page); +} + +static void mi_padding_shrink(const mi_page_t* page, const mi_block_t* block, const size_t min_size) { + MI_UNUSED(page); + MI_UNUSED(block); + MI_UNUSED(min_size); +} +#endif + +// only maintain stats for smaller objects if requested +#if (MI_STAT>0) +static void mi_stat_free(const mi_page_t* page, const mi_block_t* block) { + #if (MI_STAT < 2) + MI_UNUSED(block); + #endif + mi_heap_t* const heap = mi_heap_get_default(); + const size_t bsize = mi_page_usable_block_size(page); + #if (MI_STAT>1) + const size_t usize = mi_page_usable_size_of(page, block); + mi_heap_stat_decrease(heap, malloc, usize); + #endif + if (bsize <= MI_MEDIUM_OBJ_SIZE_MAX) { + mi_heap_stat_decrease(heap, normal, bsize); + #if (MI_STAT > 1) + mi_heap_stat_decrease(heap, normal_bins[_mi_bin(bsize)], 1); + #endif + } + else if (bsize <= MI_LARGE_OBJ_SIZE_MAX) { + mi_heap_stat_decrease(heap, large, bsize); + } + else { + mi_heap_stat_decrease(heap, huge, bsize); + } +} +#else +static void mi_stat_free(const mi_page_t* page, const mi_block_t* block) { + MI_UNUSED(page); MI_UNUSED(block); +} +#endif + +#if (MI_STAT>0) +// maintain stats for huge objects +static void mi_stat_huge_free(const mi_page_t* page) { + mi_heap_t* const heap = mi_heap_get_default(); + const size_t bsize = mi_page_block_size(page); // to match stats in `page.c:mi_page_huge_alloc` + if (bsize <= MI_LARGE_OBJ_SIZE_MAX) { + mi_heap_stat_decrease(heap, large, bsize); + } + else { + mi_heap_stat_decrease(heap, huge, bsize); + } +} +#else +static void mi_stat_huge_free(const mi_page_t* page) { + MI_UNUSED(page); +} +#endif + +// ------------------------------------------------------ +// Free +// ------------------------------------------------------ + +// multi-threaded free +static mi_decl_noinline void _mi_free_block_mt(mi_page_t* page, mi_block_t* block) +{ + // The padding check may access the non-thread-owned page for the key values. + // that is safe as these are constant and the page won't be freed (as the block is not freed yet). + mi_check_padding(page, block); + mi_padding_shrink(page, block, sizeof(mi_block_t)); // for small size, ensure we can fit the delayed thread pointers without triggering overflow detection + #if (MI_DEBUG!=0) + memset(block, MI_DEBUG_FREED, mi_usable_size(block)); + #endif + + // huge page segments are always abandoned and can be freed immediately + mi_segment_t* segment = _mi_page_segment(page); + if (segment->kind==MI_SEGMENT_HUGE) { + mi_stat_huge_free(page); + _mi_segment_huge_page_free(segment, page, block); + return; + } + + // Try to put the block on either the page-local thread free list, or the heap delayed free list. + mi_thread_free_t tfreex; + bool use_delayed; + mi_thread_free_t tfree = mi_atomic_load_relaxed(&page->xthread_free); + do { + use_delayed = (mi_tf_delayed(tfree) == MI_USE_DELAYED_FREE); + if (mi_unlikely(use_delayed)) { + // unlikely: this only happens on the first concurrent free in a page that is in the full list + tfreex = mi_tf_set_delayed(tfree,MI_DELAYED_FREEING); + } + else { + // usual: directly add to page thread_free list + mi_block_set_next(page, block, mi_tf_block(tfree)); + tfreex = mi_tf_set_block(tfree,block); + } + } while (!mi_atomic_cas_weak_release(&page->xthread_free, &tfree, tfreex)); + + if (mi_unlikely(use_delayed)) { + // racy read on `heap`, but ok because MI_DELAYED_FREEING is set (see `mi_heap_delete` and `mi_heap_collect_abandon`) + mi_heap_t* const heap = (mi_heap_t*)(mi_atomic_load_acquire(&page->xheap)); //mi_page_heap(page); + mi_assert_internal(heap != NULL); + if (heap != NULL) { + // add to the delayed free list of this heap. (do this atomically as the lock only protects heap memory validity) + mi_block_t* dfree = mi_atomic_load_ptr_relaxed(mi_block_t, &heap->thread_delayed_free); + do { + mi_block_set_nextx(heap,block,dfree, heap->keys); + } while (!mi_atomic_cas_ptr_weak_release(mi_block_t,&heap->thread_delayed_free, &dfree, block)); + } + + // and reset the MI_DELAYED_FREEING flag + tfree = mi_atomic_load_relaxed(&page->xthread_free); + do { + tfreex = tfree; + mi_assert_internal(mi_tf_delayed(tfree) == MI_DELAYED_FREEING); + tfreex = mi_tf_set_delayed(tfree,MI_NO_DELAYED_FREE); + } while (!mi_atomic_cas_weak_release(&page->xthread_free, &tfree, tfreex)); + } +} + +// regular free +static inline void _mi_free_block(mi_page_t* page, bool local, mi_block_t* block) +{ + // and push it on the free list + if (mi_likely(local)) { + // owning thread can free a block directly + if (mi_unlikely(mi_check_is_double_free(page, block))) return; + mi_check_padding(page, block); + #if (MI_DEBUG!=0) + memset(block, MI_DEBUG_FREED, mi_page_block_size(page)); + #endif + mi_block_set_next(page, block, page->local_free); + page->local_free = block; + page->used--; + if (mi_unlikely(mi_page_all_free(page))) { + _mi_page_retire(page); + } + else if (mi_unlikely(mi_page_is_in_full(page))) { + _mi_page_unfull(page); + } + } + else { + _mi_free_block_mt(page,block); + } +} + + +// Adjust a block that was allocated aligned, to the actual start of the block in the page. +mi_block_t* _mi_page_ptr_unalign(const mi_segment_t* segment, const mi_page_t* page, const void* p) { + mi_assert_internal(page!=NULL && p!=NULL); + const size_t diff = (uint8_t*)p - _mi_page_start(segment, page, NULL); + const size_t adjust = (diff % mi_page_block_size(page)); + return (mi_block_t*)((uintptr_t)p - adjust); +} + + +static void mi_decl_noinline mi_free_generic(const mi_segment_t* segment, bool local, void* p) mi_attr_noexcept { + mi_page_t* const page = _mi_segment_page_of(segment, p); + mi_block_t* const block = (mi_page_has_aligned(page) ? _mi_page_ptr_unalign(segment, page, p) : (mi_block_t*)p); + mi_stat_free(page, block); + _mi_free_block(page, local, block); +} + +// Get the segment data belonging to a pointer +// This is just a single `and` in assembly but does further checks in debug mode +// (and secure mode) if this was a valid pointer. +static inline mi_segment_t* mi_checked_ptr_segment(const void* p, const char* msg) +{ + MI_UNUSED(msg); +#if (MI_DEBUG>0) + if (mi_unlikely(((uintptr_t)p & (MI_INTPTR_SIZE - 1)) != 0)) { + _mi_error_message(EINVAL, "%s: invalid (unaligned) pointer: %p\n", msg, p); + return NULL; + } +#endif + + mi_segment_t* const segment = _mi_ptr_segment(p); + if (mi_unlikely(segment == NULL)) return NULL; // checks also for (p==NULL) + +#if (MI_DEBUG>0) + if (mi_unlikely(!mi_is_in_heap_region(p))) { + _mi_warning_message("%s: pointer might not point to a valid heap region: %p\n" + "(this may still be a valid very large allocation (over 64MiB))\n", msg, p); + if (mi_likely(_mi_ptr_cookie(segment) == segment->cookie)) { + _mi_warning_message("(yes, the previous pointer %p was valid after all)\n", p); + } + } +#endif +#if (MI_DEBUG>0 || MI_SECURE>=4) + if (mi_unlikely(_mi_ptr_cookie(segment) != segment->cookie)) { + _mi_error_message(EINVAL, "%s: pointer does not point to a valid heap space: %p\n", msg, p); + return NULL; + } +#endif + return segment; +} + +// Free a block +void mi_free(void* p) mi_attr_noexcept +{ + mi_segment_t* const segment = mi_checked_ptr_segment(p,"mi_free"); + if (mi_unlikely(segment == NULL)) return; + + mi_threadid_t tid = _mi_thread_id(); + mi_page_t* const page = _mi_segment_page_of(segment, p); + + if (mi_likely(tid == mi_atomic_load_relaxed(&segment->thread_id) && page->flags.full_aligned == 0)) { // the thread id matches and it is not a full page, nor has aligned blocks + // local, and not full or aligned + mi_block_t* block = (mi_block_t*)(p); + if (mi_unlikely(mi_check_is_double_free(page,block))) return; + mi_check_padding(page, block); + mi_stat_free(page, block); + #if (MI_DEBUG!=0) + memset(block, MI_DEBUG_FREED, mi_page_block_size(page)); + #endif + mi_block_set_next(page, block, page->local_free); + page->local_free = block; + if (mi_unlikely(--page->used == 0)) { // using this expression generates better code than: page->used--; if (mi_page_all_free(page)) + _mi_page_retire(page); + } + } + else { + // non-local, aligned blocks, or a full page; use the more generic path + // note: recalc page in generic to improve code generation + mi_free_generic(segment, tid == segment->thread_id, p); + } +} + +bool _mi_free_delayed_block(mi_block_t* block) { + // get segment and page + const mi_segment_t* const segment = _mi_ptr_segment(block); + mi_assert_internal(_mi_ptr_cookie(segment) == segment->cookie); + mi_assert_internal(_mi_thread_id() == segment->thread_id); + mi_page_t* const page = _mi_segment_page_of(segment, block); + + // Clear the no-delayed flag so delayed freeing is used again for this page. + // This must be done before collecting the free lists on this page -- otherwise + // some blocks may end up in the page `thread_free` list with no blocks in the + // heap `thread_delayed_free` list which may cause the page to be never freed! + // (it would only be freed if we happen to scan it in `mi_page_queue_find_free_ex`) + _mi_page_use_delayed_free(page, MI_USE_DELAYED_FREE, false /* dont overwrite never delayed */); + + // collect all other non-local frees to ensure up-to-date `used` count + _mi_page_free_collect(page, false); + + // and free the block (possibly freeing the page as well since used is updated) + _mi_free_block(page, true, block); + return true; +} + +// Bytes available in a block +mi_decl_noinline static size_t mi_page_usable_aligned_size_of(const mi_segment_t* segment, const mi_page_t* page, const void* p) mi_attr_noexcept { + const mi_block_t* block = _mi_page_ptr_unalign(segment, page, p); + const size_t size = mi_page_usable_size_of(page, block); + const ptrdiff_t adjust = (uint8_t*)p - (uint8_t*)block; + mi_assert_internal(adjust >= 0 && (size_t)adjust <= size); + return (size - adjust); +} + +static inline size_t _mi_usable_size(const void* p, const char* msg) mi_attr_noexcept { + const mi_segment_t* const segment = mi_checked_ptr_segment(p, msg); + if (segment==NULL) return 0; // also returns 0 if `p == NULL` + const mi_page_t* const page = _mi_segment_page_of(segment, p); + if (mi_likely(!mi_page_has_aligned(page))) { + const mi_block_t* block = (const mi_block_t*)p; + return mi_page_usable_size_of(page, block); + } + else { + // split out to separate routine for improved code generation + return mi_page_usable_aligned_size_of(segment, page, p); + } +} + +size_t mi_usable_size(const void* p) mi_attr_noexcept { + return _mi_usable_size(p, "mi_usable_size"); +} + + +// ------------------------------------------------------ +// ensure explicit external inline definitions are emitted! +// ------------------------------------------------------ + +#ifdef __cplusplus +void* _mi_externs[] = { + (void*)&_mi_page_malloc, + (void*)&mi_malloc, + (void*)&mi_malloc_small, + (void*)&mi_zalloc_small, + (void*)&mi_heap_malloc, + (void*)&mi_heap_zalloc, + (void*)&mi_heap_malloc_small +}; +#endif + + +// ------------------------------------------------------ +// Allocation extensions +// ------------------------------------------------------ + +void mi_free_size(void* p, size_t size) mi_attr_noexcept { + MI_UNUSED_RELEASE(size); + mi_assert(p == NULL || size <= _mi_usable_size(p,"mi_free_size")); + mi_free(p); +} + +void mi_free_size_aligned(void* p, size_t size, size_t alignment) mi_attr_noexcept { + MI_UNUSED_RELEASE(alignment); + mi_assert(((uintptr_t)p % alignment) == 0); + mi_free_size(p,size); +} + +void mi_free_aligned(void* p, size_t alignment) mi_attr_noexcept { + MI_UNUSED_RELEASE(alignment); + mi_assert(((uintptr_t)p % alignment) == 0); + mi_free(p); +} + +extern inline mi_decl_restrict void* mi_heap_calloc(mi_heap_t* heap, size_t count, size_t size) mi_attr_noexcept { + size_t total; + if (mi_count_size_overflow(count,size,&total)) return NULL; + return mi_heap_zalloc(heap,total); +} + +mi_decl_restrict void* mi_calloc(size_t count, size_t size) mi_attr_noexcept { + return mi_heap_calloc(mi_get_default_heap(),count,size); +} + +// Uninitialized `calloc` +extern mi_decl_restrict void* mi_heap_mallocn(mi_heap_t* heap, size_t count, size_t size) mi_attr_noexcept { + size_t total; + if (mi_count_size_overflow(count, size, &total)) return NULL; + return mi_heap_malloc(heap, total); +} + +mi_decl_restrict void* mi_mallocn(size_t count, size_t size) mi_attr_noexcept { + return mi_heap_mallocn(mi_get_default_heap(),count,size); +} + +// Expand (or shrink) in place (or fail) +void* mi_expand(void* p, size_t newsize) mi_attr_noexcept { + #if MI_PADDING + // we do not shrink/expand with padding enabled + MI_UNUSED(p); MI_UNUSED(newsize); + return NULL; + #else + if (p == NULL) return NULL; + const size_t size = _mi_usable_size(p,"mi_expand"); + if (newsize > size) return NULL; + return p; // it fits + #endif +} + +void* _mi_heap_realloc_zero(mi_heap_t* heap, void* p, size_t newsize, bool zero) mi_attr_noexcept { + const size_t size = _mi_usable_size(p,"mi_realloc"); // also works if p == NULL + if (mi_unlikely(newsize <= size && newsize >= (size / 2))) { + // todo: adjust potential padding to reflect the new size? + return p; // reallocation still fits and not more than 50% waste + } + void* newp = mi_heap_malloc(heap,newsize); + if (mi_likely(newp != NULL)) { + if (zero && newsize > size) { + // also set last word in the previous allocation to zero to ensure any padding is zero-initialized + const size_t start = (size >= sizeof(intptr_t) ? size - sizeof(intptr_t) : 0); + memset((uint8_t*)newp + start, 0, newsize - start); + } + if (mi_likely(p != NULL)) { + _mi_memcpy_aligned(newp, p, (newsize > size ? size : newsize)); + mi_free(p); // only free the original pointer if successful + } + } + return newp; +} + +void* mi_heap_realloc(mi_heap_t* heap, void* p, size_t newsize) mi_attr_noexcept { + return _mi_heap_realloc_zero(heap, p, newsize, false); +} + +void* mi_heap_reallocn(mi_heap_t* heap, void* p, size_t count, size_t size) mi_attr_noexcept { + size_t total; + if (mi_count_size_overflow(count, size, &total)) return NULL; + return mi_heap_realloc(heap, p, total); +} + + +// Reallocate but free `p` on errors +void* mi_heap_reallocf(mi_heap_t* heap, void* p, size_t newsize) mi_attr_noexcept { + void* newp = mi_heap_realloc(heap, p, newsize); + if (newp==NULL && p!=NULL) mi_free(p); + return newp; +} + +void* mi_heap_rezalloc(mi_heap_t* heap, void* p, size_t newsize) mi_attr_noexcept { + return _mi_heap_realloc_zero(heap, p, newsize, true); +} + +void* mi_heap_recalloc(mi_heap_t* heap, void* p, size_t count, size_t size) mi_attr_noexcept { + size_t total; + if (mi_count_size_overflow(count, size, &total)) return NULL; + return mi_heap_rezalloc(heap, p, total); +} + + +void* mi_realloc(void* p, size_t newsize) mi_attr_noexcept { + return mi_heap_realloc(mi_get_default_heap(),p,newsize); +} + +void* mi_reallocn(void* p, size_t count, size_t size) mi_attr_noexcept { + return mi_heap_reallocn(mi_get_default_heap(),p,count,size); +} + +// Reallocate but free `p` on errors +void* mi_reallocf(void* p, size_t newsize) mi_attr_noexcept { + return mi_heap_reallocf(mi_get_default_heap(),p,newsize); +} + +void* mi_rezalloc(void* p, size_t newsize) mi_attr_noexcept { + return mi_heap_rezalloc(mi_get_default_heap(), p, newsize); +} + +void* mi_recalloc(void* p, size_t count, size_t size) mi_attr_noexcept { + return mi_heap_recalloc(mi_get_default_heap(), p, count, size); +} + + + +// ------------------------------------------------------ +// strdup, strndup, and realpath +// ------------------------------------------------------ + +// `strdup` using mi_malloc +mi_decl_restrict char* mi_heap_strdup(mi_heap_t* heap, const char* s) mi_attr_noexcept { + if (s == NULL) return NULL; + size_t n = strlen(s); + char* t = (char*)mi_heap_malloc(heap,n+1); + if (t != NULL) _mi_memcpy(t, s, n + 1); + return t; +} + +mi_decl_restrict char* mi_strdup(const char* s) mi_attr_noexcept { + return mi_heap_strdup(mi_get_default_heap(), s); +} + +// `strndup` using mi_malloc +mi_decl_restrict char* mi_heap_strndup(mi_heap_t* heap, const char* s, size_t n) mi_attr_noexcept { + if (s == NULL) return NULL; + const char* end = (const char*)memchr(s, 0, n); // find end of string in the first `n` characters (returns NULL if not found) + const size_t m = (end != NULL ? (size_t)(end - s) : n); // `m` is the minimum of `n` or the end-of-string + mi_assert_internal(m <= n); + char* t = (char*)mi_heap_malloc(heap, m+1); + if (t == NULL) return NULL; + _mi_memcpy(t, s, m); + t[m] = 0; + return t; +} + +mi_decl_restrict char* mi_strndup(const char* s, size_t n) mi_attr_noexcept { + return mi_heap_strndup(mi_get_default_heap(),s,n); +} + +#ifndef __wasi__ +// `realpath` using mi_malloc +#ifdef _WIN32 +#ifndef PATH_MAX +#define PATH_MAX MAX_PATH +#endif +#include +mi_decl_restrict char* mi_heap_realpath(mi_heap_t* heap, const char* fname, char* resolved_name) mi_attr_noexcept { + // todo: use GetFullPathNameW to allow longer file names + char buf[PATH_MAX]; + DWORD res = GetFullPathNameA(fname, PATH_MAX, (resolved_name == NULL ? buf : resolved_name), NULL); + if (res == 0) { + errno = GetLastError(); return NULL; + } + else if (res > PATH_MAX) { + errno = EINVAL; return NULL; + } + else if (resolved_name != NULL) { + return resolved_name; + } + else { + return mi_heap_strndup(heap, buf, PATH_MAX); + } +} +#else +#include // pathconf +static size_t mi_path_max(void) { + static size_t path_max = 0; + if (path_max <= 0) { + long m = pathconf("/",_PC_PATH_MAX); + if (m <= 0) path_max = 4096; // guess + else if (m < 256) path_max = 256; // at least 256 + else path_max = m; + } + return path_max; +} + +char* mi_heap_realpath(mi_heap_t* heap, const char* fname, char* resolved_name) mi_attr_noexcept { + if (resolved_name != NULL) { + return realpath(fname,resolved_name); + } + else { + size_t n = mi_path_max(); + char* buf = (char*)mi_malloc(n+1); + if (buf==NULL) return NULL; + char* rname = realpath(fname,buf); + char* result = mi_heap_strndup(heap,rname,n); // ok if `rname==NULL` + mi_free(buf); + return result; + } +} +#endif + +mi_decl_restrict char* mi_realpath(const char* fname, char* resolved_name) mi_attr_noexcept { + return mi_heap_realpath(mi_get_default_heap(),fname,resolved_name); +} +#endif + +/*------------------------------------------------------- +C++ new and new_aligned +The standard requires calling into `get_new_handler` and +throwing the bad_alloc exception on failure. If we compile +with a C++ compiler we can implement this precisely. If we +use a C compiler we cannot throw a `bad_alloc` exception +but we call `exit` instead (i.e. not returning). +-------------------------------------------------------*/ + +#ifdef __cplusplus +#include +static bool mi_try_new_handler(bool nothrow) { + #if defined(_MSC_VER) || (__cplusplus >= 201103L) + std::new_handler h = std::get_new_handler(); + #else + std::new_handler h = std::set_new_handler(); + std::set_new_handler(h); + #endif + if (h==NULL) { + _mi_error_message(ENOMEM, "out of memory in 'new'"); + if (!nothrow) { + throw std::bad_alloc(); + } + return false; + } + else { + h(); + return true; + } +} +#else +typedef void (*std_new_handler_t)(void); + +#if (defined(__GNUC__) || defined(__clang__)) +std_new_handler_t __attribute((weak)) _ZSt15get_new_handlerv(void) { + return NULL; +} +static std_new_handler_t mi_get_new_handler(void) { + return _ZSt15get_new_handlerv(); +} +#else +// note: on windows we could dynamically link to `?get_new_handler@std@@YAP6AXXZXZ`. +static std_new_handler_t mi_get_new_handler() { + return NULL; +} +#endif + +static bool mi_try_new_handler(bool nothrow) { + std_new_handler_t h = mi_get_new_handler(); + if (h==NULL) { + _mi_error_message(ENOMEM, "out of memory in 'new'"); + if (!nothrow) { + abort(); // cannot throw in plain C, use abort + } + return false; + } + else { + h(); + return true; + } +} +#endif + +static mi_decl_noinline void* mi_try_new(size_t size, bool nothrow ) { + void* p = NULL; + while(p == NULL && mi_try_new_handler(nothrow)) { + p = mi_malloc(size); + } + return p; +} + +mi_decl_restrict void* mi_new(size_t size) { + void* p = mi_malloc(size); + if (mi_unlikely(p == NULL)) return mi_try_new(size,false); + return p; +} + +mi_decl_restrict void* mi_new_nothrow(size_t size) mi_attr_noexcept { + void* p = mi_malloc(size); + if (mi_unlikely(p == NULL)) return mi_try_new(size, true); + return p; +} + +mi_decl_restrict void* mi_new_aligned(size_t size, size_t alignment) { + void* p; + do { + p = mi_malloc_aligned(size, alignment); + } + while(p == NULL && mi_try_new_handler(false)); + return p; +} + +mi_decl_restrict void* mi_new_aligned_nothrow(size_t size, size_t alignment) mi_attr_noexcept { + void* p; + do { + p = mi_malloc_aligned(size, alignment); + } + while(p == NULL && mi_try_new_handler(true)); + return p; +} + +mi_decl_restrict void* mi_new_n(size_t count, size_t size) { + size_t total; + if (mi_unlikely(mi_count_size_overflow(count, size, &total))) { + mi_try_new_handler(false); // on overflow we invoke the try_new_handler once to potentially throw std::bad_alloc + return NULL; + } + else { + return mi_new(total); + } +} + +void* mi_new_realloc(void* p, size_t newsize) { + void* q; + do { + q = mi_realloc(p, newsize); + } while (q == NULL && mi_try_new_handler(false)); + return q; +} + +void* mi_new_reallocn(void* p, size_t newcount, size_t size) { + size_t total; + if (mi_unlikely(mi_count_size_overflow(newcount, size, &total))) { + mi_try_new_handler(false); // on overflow we invoke the try_new_handler once to potentially throw std::bad_alloc + return NULL; + } + else { + return mi_new_realloc(p, total); + } +} diff --git a/compat/mimalloc/arena.c b/compat/mimalloc/arena.c new file mode 100644 index 00000000000000..567c8a93ac30c8 --- /dev/null +++ b/compat/mimalloc/arena.c @@ -0,0 +1,446 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2019-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +/* ---------------------------------------------------------------------------- +"Arenas" are fixed area's of OS memory from which we can allocate +large blocks (>= MI_ARENA_MIN_BLOCK_SIZE, 4MiB). +In contrast to the rest of mimalloc, the arenas are shared between +threads and need to be accessed using atomic operations. + +Currently arenas are only used to for huge OS page (1GiB) reservations, +or direct OS memory reservations -- otherwise it delegates to direct allocation from the OS. +In the future, we can expose an API to manually add more kinds of arenas +which is sometimes needed for embedded devices or shared memory for example. +(We can also employ this with WASI or `sbrk` systems to reserve large arenas + on demand and be able to reuse them efficiently). + +The arena allocation needs to be thread safe and we use an atomic bitmap to allocate. +-----------------------------------------------------------------------------*/ +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include // memset +#include // ENOMEM + +#include "bitmap.h" // atomic bitmap + + +// os.c +void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool* large, mi_stats_t* stats); +void _mi_os_free_ex(void* p, size_t size, bool was_committed, mi_stats_t* stats); + +void* _mi_os_alloc_huge_os_pages(size_t pages, int numa_node, mi_msecs_t max_secs, size_t* pages_reserved, size_t* psize); +void _mi_os_free_huge_pages(void* p, size_t size, mi_stats_t* stats); + +bool _mi_os_commit(void* p, size_t size, bool* is_zero, mi_stats_t* stats); +bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* stats); + + +/* ----------------------------------------------------------- + Arena allocation +----------------------------------------------------------- */ + + +// Block info: bit 0 contains the `in_use` bit, the upper bits the +// size in count of arena blocks. +typedef uintptr_t mi_block_info_t; +#define MI_ARENA_BLOCK_SIZE (MI_SEGMENT_SIZE) // 8MiB (must be at least MI_SEGMENT_ALIGN) +#define MI_ARENA_MIN_OBJ_SIZE (MI_ARENA_BLOCK_SIZE/2) // 4MiB +#define MI_MAX_ARENAS (64) // not more than 256 (since we use 8 bits in the memid) + +// A memory arena descriptor +typedef struct mi_arena_s { + _Atomic(uint8_t*) start; // the start of the memory area + size_t block_count; // size of the area in arena blocks (of `MI_ARENA_BLOCK_SIZE`) + size_t field_count; // number of bitmap fields (where `field_count * MI_BITMAP_FIELD_BITS >= block_count`) + int numa_node; // associated NUMA node + bool is_zero_init; // is the arena zero initialized? + bool allow_decommit; // is decommit allowed? if true, is_large should be false and blocks_committed != NULL + bool is_large; // large- or huge OS pages (always committed) + _Atomic(size_t) search_idx; // optimization to start the search for free blocks + mi_bitmap_field_t* blocks_dirty; // are the blocks potentially non-zero? + mi_bitmap_field_t* blocks_committed; // are the blocks committed? (can be NULL for memory that cannot be decommitted) + mi_bitmap_field_t blocks_inuse[1]; // in-place bitmap of in-use blocks (of size `field_count`) +} mi_arena_t; + + +// The available arenas +static mi_decl_cache_align _Atomic(mi_arena_t*) mi_arenas[MI_MAX_ARENAS]; +static mi_decl_cache_align _Atomic(size_t) mi_arena_count; // = 0 + + +/* ----------------------------------------------------------- + Arena allocations get a memory id where the lower 8 bits are + the arena index +1, and the upper bits the block index. +----------------------------------------------------------- */ + +// Use `0` as a special id for direct OS allocated memory. +#define MI_MEMID_OS 0 + +static size_t mi_arena_id_create(size_t arena_index, mi_bitmap_index_t bitmap_index) { + mi_assert_internal(arena_index < 0xFE); + mi_assert_internal(((bitmap_index << 8) >> 8) == bitmap_index); // no overflow? + return ((bitmap_index << 8) | ((arena_index+1) & 0xFF)); +} + +static void mi_arena_id_indices(size_t memid, size_t* arena_index, mi_bitmap_index_t* bitmap_index) { + mi_assert_internal(memid != MI_MEMID_OS); + *arena_index = (memid & 0xFF) - 1; + *bitmap_index = (memid >> 8); +} + +static size_t mi_block_count_of_size(size_t size) { + return _mi_divide_up(size, MI_ARENA_BLOCK_SIZE); +} + +/* ----------------------------------------------------------- + Thread safe allocation in an arena +----------------------------------------------------------- */ +static bool mi_arena_alloc(mi_arena_t* arena, size_t blocks, mi_bitmap_index_t* bitmap_idx) +{ + size_t idx = 0; // mi_atomic_load_relaxed(&arena->search_idx); // start from last search; ok to be relaxed as the exact start does not matter + if (_mi_bitmap_try_find_from_claim_across(arena->blocks_inuse, arena->field_count, idx, blocks, bitmap_idx)) { + mi_atomic_store_relaxed(&arena->search_idx, mi_bitmap_index_field(*bitmap_idx)); // start search from found location next time around + return true; + }; + return false; +} + + +/* ----------------------------------------------------------- + Arena Allocation +----------------------------------------------------------- */ + +static mi_decl_noinline void* mi_arena_alloc_from(mi_arena_t* arena, size_t arena_index, size_t needed_bcount, + bool* commit, bool* large, bool* is_pinned, bool* is_zero, size_t* memid, mi_os_tld_t* tld) +{ + mi_bitmap_index_t bitmap_index; + if (!mi_arena_alloc(arena, needed_bcount, &bitmap_index)) return NULL; + + // claimed it! set the dirty bits (todo: no need for an atomic op here?) + void* p = arena->start + (mi_bitmap_index_bit(bitmap_index)*MI_ARENA_BLOCK_SIZE); + *memid = mi_arena_id_create(arena_index, bitmap_index); + *is_zero = _mi_bitmap_claim_across(arena->blocks_dirty, arena->field_count, needed_bcount, bitmap_index, NULL); + *large = arena->is_large; + *is_pinned = (arena->is_large || !arena->allow_decommit); + if (arena->blocks_committed == NULL) { + // always committed + *commit = true; + } + else if (*commit) { + // arena not committed as a whole, but commit requested: ensure commit now + bool any_uncommitted; + _mi_bitmap_claim_across(arena->blocks_committed, arena->field_count, needed_bcount, bitmap_index, &any_uncommitted); + if (any_uncommitted) { + bool commit_zero; + _mi_os_commit(p, needed_bcount * MI_ARENA_BLOCK_SIZE, &commit_zero, tld->stats); + if (commit_zero) *is_zero = true; + } + } + else { + // no need to commit, but check if already fully committed + *commit = _mi_bitmap_is_claimed_across(arena->blocks_committed, arena->field_count, needed_bcount, bitmap_index); + } + return p; +} + +static mi_decl_noinline void* mi_arena_allocate(int numa_node, size_t size, size_t alignment, bool* commit, bool* large, bool* is_pinned, bool* is_zero, size_t* memid, mi_os_tld_t* tld) +{ + MI_UNUSED_RELEASE(alignment); + mi_assert_internal(alignment <= MI_SEGMENT_ALIGN); + const size_t max_arena = mi_atomic_load_relaxed(&mi_arena_count); + const size_t bcount = mi_block_count_of_size(size); + if (mi_likely(max_arena == 0)) return NULL; + mi_assert_internal(size <= bcount*MI_ARENA_BLOCK_SIZE); + + // try numa affine allocation + for (size_t i = 0; i < max_arena; i++) { + mi_arena_t* arena = mi_atomic_load_ptr_relaxed(mi_arena_t, &mi_arenas[i]); + if (arena==NULL) break; // end reached + if ((arena->numa_node<0 || arena->numa_node==numa_node) && // numa local? + (*large || !arena->is_large)) // large OS pages allowed, or arena is not large OS pages + { + void* p = mi_arena_alloc_from(arena, i, bcount, commit, large, is_pinned, is_zero, memid, tld); + mi_assert_internal((uintptr_t)p % alignment == 0); + if (p != NULL) { + return p; + } + } + } + + // try from another numa node instead.. + for (size_t i = 0; i < max_arena; i++) { + mi_arena_t* arena = mi_atomic_load_ptr_relaxed(mi_arena_t, &mi_arenas[i]); + if (arena==NULL) break; // end reached + if ((arena->numa_node>=0 && arena->numa_node!=numa_node) && // not numa local! + (*large || !arena->is_large)) // large OS pages allowed, or arena is not large OS pages + { + void* p = mi_arena_alloc_from(arena, i, bcount, commit, large, is_pinned, is_zero, memid, tld); + mi_assert_internal((uintptr_t)p % alignment == 0); + if (p != NULL) { + return p; + } + } + } + return NULL; +} + + +void* _mi_arena_alloc_aligned(size_t size, size_t alignment, bool* commit, bool* large, bool* is_pinned, bool* is_zero, + size_t* memid, mi_os_tld_t* tld) +{ + mi_assert_internal(commit != NULL && is_pinned != NULL && is_zero != NULL && memid != NULL && tld != NULL); + mi_assert_internal(size > 0); + *memid = MI_MEMID_OS; + *is_zero = false; + *is_pinned = false; + + bool default_large = false; + if (large==NULL) large = &default_large; // ensure `large != NULL` + const int numa_node = _mi_os_numa_node(tld); // current numa node + + // try to allocate in an arena if the alignment is small enough and the object is not too small (as for heap meta data) + if (size >= MI_ARENA_MIN_OBJ_SIZE && alignment <= MI_SEGMENT_ALIGN) { + void* p = mi_arena_allocate(numa_node, size, alignment, commit, large, is_pinned, is_zero, memid, tld); + if (p != NULL) return p; + } + + // finally, fall back to the OS + if (mi_option_is_enabled(mi_option_limit_os_alloc)) { + errno = ENOMEM; + return NULL; + } + *is_zero = true; + *memid = MI_MEMID_OS; + void* p = _mi_os_alloc_aligned(size, alignment, *commit, large, tld->stats); + if (p != NULL) *is_pinned = *large; + return p; +} + +void* _mi_arena_alloc(size_t size, bool* commit, bool* large, bool* is_pinned, bool* is_zero, size_t* memid, mi_os_tld_t* tld) +{ + return _mi_arena_alloc_aligned(size, MI_ARENA_BLOCK_SIZE, commit, large, is_pinned, is_zero, memid, tld); +} + +/* ----------------------------------------------------------- + Arena free +----------------------------------------------------------- */ + +void _mi_arena_free(void* p, size_t size, size_t memid, bool all_committed, mi_os_tld_t* tld) { + mi_assert_internal(size > 0 && tld->stats != NULL); + if (p==NULL) return; + if (size==0) return; + + if (memid == MI_MEMID_OS) { + // was a direct OS allocation, pass through + _mi_os_free_ex(p, size, all_committed, tld->stats); + } + else { + // allocated in an arena + size_t arena_idx; + size_t bitmap_idx; + mi_arena_id_indices(memid, &arena_idx, &bitmap_idx); + mi_assert_internal(arena_idx < MI_MAX_ARENAS); + mi_arena_t* arena = mi_atomic_load_ptr_relaxed(mi_arena_t,&mi_arenas[arena_idx]); + mi_assert_internal(arena != NULL); + const size_t blocks = mi_block_count_of_size(size); + // checks + if (arena == NULL) { + _mi_error_message(EINVAL, "trying to free from non-existent arena: %p, size %zu, memid: 0x%zx\n", p, size, memid); + return; + } + mi_assert_internal(arena->field_count > mi_bitmap_index_field(bitmap_idx)); + if (arena->field_count <= mi_bitmap_index_field(bitmap_idx)) { + _mi_error_message(EINVAL, "trying to free from non-existent arena block: %p, size %zu, memid: 0x%zx\n", p, size, memid); + return; + } + // potentially decommit + if (!arena->allow_decommit || arena->blocks_committed == NULL) { + mi_assert_internal(all_committed); // note: may be not true as we may "pretend" to be not committed (in segment.c) + } + else { + mi_assert_internal(arena->blocks_committed != NULL); + _mi_os_decommit(p, blocks * MI_ARENA_BLOCK_SIZE, tld->stats); // ok if this fails + _mi_bitmap_unclaim_across(arena->blocks_committed, arena->field_count, blocks, bitmap_idx); + } + // and make it available to others again + bool all_inuse = _mi_bitmap_unclaim_across(arena->blocks_inuse, arena->field_count, blocks, bitmap_idx); + if (!all_inuse) { + _mi_error_message(EAGAIN, "trying to free an already freed block: %p, size %zu\n", p, size); + return; + }; + } +} + +/* ----------------------------------------------------------- + Add an arena. +----------------------------------------------------------- */ + +static bool mi_arena_add(mi_arena_t* arena) { + mi_assert_internal(arena != NULL); + mi_assert_internal((uintptr_t)mi_atomic_load_ptr_relaxed(uint8_t,&arena->start) % MI_SEGMENT_ALIGN == 0); + mi_assert_internal(arena->block_count > 0); + + size_t i = mi_atomic_increment_acq_rel(&mi_arena_count); + if (i >= MI_MAX_ARENAS) { + mi_atomic_decrement_acq_rel(&mi_arena_count); + return false; + } + mi_atomic_store_ptr_release(mi_arena_t,&mi_arenas[i], arena); + return true; +} + +bool mi_manage_os_memory(void* start, size_t size, bool is_committed, bool is_large, bool is_zero, int numa_node) mi_attr_noexcept +{ + if (size < MI_ARENA_BLOCK_SIZE) return false; + + if (is_large) { + mi_assert_internal(is_committed); + is_committed = true; + } + + const size_t bcount = size / MI_ARENA_BLOCK_SIZE; + const size_t fields = _mi_divide_up(bcount, MI_BITMAP_FIELD_BITS); + const size_t bitmaps = (is_committed ? 2 : 3); + const size_t asize = sizeof(mi_arena_t) + (bitmaps*fields*sizeof(mi_bitmap_field_t)); + mi_arena_t* arena = (mi_arena_t*)_mi_os_alloc(asize, &_mi_stats_main); // TODO: can we avoid allocating from the OS? + if (arena == NULL) return false; + + arena->block_count = bcount; + arena->field_count = fields; + arena->start = (uint8_t*)start; + arena->numa_node = numa_node; // TODO: or get the current numa node if -1? (now it allows anyone to allocate on -1) + arena->is_large = is_large; + arena->is_zero_init = is_zero; + arena->allow_decommit = !is_large && !is_committed; // only allow decommit for initially uncommitted memory + arena->search_idx = 0; + arena->blocks_dirty = &arena->blocks_inuse[fields]; // just after inuse bitmap + arena->blocks_committed = (!arena->allow_decommit ? NULL : &arena->blocks_inuse[2*fields]); // just after dirty bitmap + // the bitmaps are already zero initialized due to os_alloc + // initialize committed bitmap? + if (arena->blocks_committed != NULL && is_committed) { + memset((void*)arena->blocks_committed, 0xFF, fields*sizeof(mi_bitmap_field_t)); // cast to void* to avoid atomic warning + } + // and claim leftover blocks if needed (so we never allocate there) + ptrdiff_t post = (fields * MI_BITMAP_FIELD_BITS) - bcount; + mi_assert_internal(post >= 0); + if (post > 0) { + // don't use leftover bits at the end + mi_bitmap_index_t postidx = mi_bitmap_index_create(fields - 1, MI_BITMAP_FIELD_BITS - post); + _mi_bitmap_claim(arena->blocks_inuse, fields, post, postidx, NULL); + } + + mi_arena_add(arena); + return true; +} + +// Reserve a range of regular OS memory +int mi_reserve_os_memory(size_t size, bool commit, bool allow_large) mi_attr_noexcept +{ + size = _mi_align_up(size, MI_ARENA_BLOCK_SIZE); // at least one block + bool large = allow_large; + void* start = _mi_os_alloc_aligned(size, MI_SEGMENT_ALIGN, commit, &large, &_mi_stats_main); + if (start==NULL) return ENOMEM; + if (!mi_manage_os_memory(start, size, (large || commit), large, true, -1)) { + _mi_os_free_ex(start, size, commit, &_mi_stats_main); + _mi_verbose_message("failed to reserve %zu k memory\n", _mi_divide_up(size,1024)); + return ENOMEM; + } + _mi_verbose_message("reserved %zu KiB memory%s\n", _mi_divide_up(size,1024), large ? " (in large os pages)" : ""); + return 0; +} + +static size_t mi_debug_show_bitmap(const char* prefix, mi_bitmap_field_t* fields, size_t field_count ) { + size_t inuse_count = 0; + for (size_t i = 0; i < field_count; i++) { + char buf[MI_BITMAP_FIELD_BITS + 1]; + uintptr_t field = mi_atomic_load_relaxed(&fields[i]); + for (size_t bit = 0; bit < MI_BITMAP_FIELD_BITS; bit++) { + bool inuse = ((((uintptr_t)1 << bit) & field) != 0); + if (inuse) inuse_count++; + buf[MI_BITMAP_FIELD_BITS - 1 - bit] = (inuse ? 'x' : '.'); + } + buf[MI_BITMAP_FIELD_BITS] = 0; + _mi_verbose_message("%s%s\n", prefix, buf); + } + return inuse_count; +} + +void mi_debug_show_arenas(void) mi_attr_noexcept { + size_t max_arenas = mi_atomic_load_relaxed(&mi_arena_count); + for (size_t i = 0; i < max_arenas; i++) { + mi_arena_t* arena = mi_atomic_load_ptr_relaxed(mi_arena_t, &mi_arenas[i]); + if (arena == NULL) break; + size_t inuse_count = 0; + _mi_verbose_message("arena %zu: %zu blocks with %zu fields\n", i, arena->block_count, arena->field_count); + inuse_count += mi_debug_show_bitmap(" ", arena->blocks_inuse, arena->field_count); + _mi_verbose_message(" blocks in use ('x'): %zu\n", inuse_count); + } +} + +/* ----------------------------------------------------------- + Reserve a huge page arena. +----------------------------------------------------------- */ +// reserve at a specific numa node +int mi_reserve_huge_os_pages_at(size_t pages, int numa_node, size_t timeout_msecs) mi_attr_noexcept { + if (pages==0) return 0; + if (numa_node < -1) numa_node = -1; + if (numa_node >= 0) numa_node = numa_node % _mi_os_numa_node_count(); + size_t hsize = 0; + size_t pages_reserved = 0; + void* p = _mi_os_alloc_huge_os_pages(pages, numa_node, timeout_msecs, &pages_reserved, &hsize); + if (p==NULL || pages_reserved==0) { + _mi_warning_message("failed to reserve %zu GiB huge pages\n", pages); + return ENOMEM; + } + _mi_verbose_message("numa node %i: reserved %zu GiB huge pages (of the %zu GiB requested)\n", numa_node, pages_reserved, pages); + + if (!mi_manage_os_memory(p, hsize, true, true, true, numa_node)) { + _mi_os_free_huge_pages(p, hsize, &_mi_stats_main); + return ENOMEM; + } + return 0; +} + + +// reserve huge pages evenly among the given number of numa nodes (or use the available ones as detected) +int mi_reserve_huge_os_pages_interleave(size_t pages, size_t numa_nodes, size_t timeout_msecs) mi_attr_noexcept { + if (pages == 0) return 0; + + // pages per numa node + size_t numa_count = (numa_nodes > 0 ? numa_nodes : _mi_os_numa_node_count()); + if (numa_count <= 0) numa_count = 1; + const size_t pages_per = pages / numa_count; + const size_t pages_mod = pages % numa_count; + const size_t timeout_per = (timeout_msecs==0 ? 0 : (timeout_msecs / numa_count) + 50); + + // reserve evenly among numa nodes + for (size_t numa_node = 0; numa_node < numa_count && pages > 0; numa_node++) { + size_t node_pages = pages_per; // can be 0 + if (numa_node < pages_mod) node_pages++; + int err = mi_reserve_huge_os_pages_at(node_pages, (int)numa_node, timeout_per); + if (err) return err; + if (pages < node_pages) { + pages = 0; + } + else { + pages -= node_pages; + } + } + + return 0; +} + +int mi_reserve_huge_os_pages(size_t pages, double max_secs, size_t* pages_reserved) mi_attr_noexcept { + MI_UNUSED(max_secs); + _mi_warning_message("mi_reserve_huge_os_pages is deprecated: use mi_reserve_huge_os_pages_interleave/at instead\n"); + if (pages_reserved != NULL) *pages_reserved = 0; + int err = mi_reserve_huge_os_pages_interleave(pages, 0, (size_t)(max_secs * 1000.0)); + if (err==0 && pages_reserved!=NULL) *pages_reserved = pages; + return err; +} diff --git a/compat/mimalloc/bitmap.c b/compat/mimalloc/bitmap.c new file mode 100644 index 00000000000000..8634b32ab13fa9 --- /dev/null +++ b/compat/mimalloc/bitmap.c @@ -0,0 +1,395 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2019-2021 Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +/* ---------------------------------------------------------------------------- +Concurrent bitmap that can set/reset sequences of bits atomically, +represeted as an array of fields where each field is a machine word (`size_t`) + +There are two api's; the standard one cannot have sequences that cross +between the bitmap fields (and a sequence must be <= MI_BITMAP_FIELD_BITS). +(this is used in region allocation) + +The `_across` postfixed functions do allow sequences that can cross over +between the fields. (This is used in arena allocation) +---------------------------------------------------------------------------- */ + +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "bitmap.h" + +/* ----------------------------------------------------------- + Bitmap definition +----------------------------------------------------------- */ + +// The bit mask for a given number of blocks at a specified bit index. +static inline size_t mi_bitmap_mask_(size_t count, size_t bitidx) { + mi_assert_internal(count + bitidx <= MI_BITMAP_FIELD_BITS); + mi_assert_internal(count > 0); + if (count >= MI_BITMAP_FIELD_BITS) return MI_BITMAP_FIELD_FULL; + if (count == 0) return 0; + return ((((size_t)1 << count) - 1) << bitidx); +} + + +/* ----------------------------------------------------------- + Claim a bit sequence atomically +----------------------------------------------------------- */ + +// Try to atomically claim a sequence of `count` bits in a single +// field at `idx` in `bitmap`. Returns `true` on success. +inline bool _mi_bitmap_try_find_claim_field(mi_bitmap_t bitmap, size_t idx, const size_t count, mi_bitmap_index_t* bitmap_idx) +{ + mi_assert_internal(bitmap_idx != NULL); + mi_assert_internal(count <= MI_BITMAP_FIELD_BITS); + mi_assert_internal(count > 0); + mi_bitmap_field_t* field = &bitmap[idx]; + size_t map = mi_atomic_load_relaxed(field); + if (map==MI_BITMAP_FIELD_FULL) return false; // short cut + + // search for 0-bit sequence of length count + const size_t mask = mi_bitmap_mask_(count, 0); + const size_t bitidx_max = MI_BITMAP_FIELD_BITS - count; + +#ifdef MI_HAVE_FAST_BITSCAN + size_t bitidx = mi_ctz(~map); // quickly find the first zero bit if possible +#else + size_t bitidx = 0; // otherwise start at 0 +#endif + size_t m = (mask << bitidx); // invariant: m == mask shifted by bitidx + + // scan linearly for a free range of zero bits + while (bitidx <= bitidx_max) { + const size_t mapm = map & m; + if (mapm == 0) { // are the mask bits free at bitidx? + mi_assert_internal((m >> bitidx) == mask); // no overflow? + const size_t newmap = map | m; + mi_assert_internal((newmap^map) >> bitidx == mask); + if (!mi_atomic_cas_weak_acq_rel(field, &map, newmap)) { // TODO: use strong cas here? + // no success, another thread claimed concurrently.. keep going (with updated `map`) + continue; + } + else { + // success, we claimed the bits! + *bitmap_idx = mi_bitmap_index_create(idx, bitidx); + return true; + } + } + else { + // on to the next bit range +#ifdef MI_HAVE_FAST_BITSCAN + const size_t shift = (count == 1 ? 1 : mi_bsr(mapm) - bitidx + 1); + mi_assert_internal(shift > 0 && shift <= count); +#else + const size_t shift = 1; +#endif + bitidx += shift; + m <<= shift; + } + } + // no bits found + return false; +} + +// Find `count` bits of 0 and set them to 1 atomically; returns `true` on success. +// Starts at idx, and wraps around to search in all `bitmap_fields` fields. +// `count` can be at most MI_BITMAP_FIELD_BITS and will never cross fields. +bool _mi_bitmap_try_find_from_claim(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx) { + size_t idx = start_field_idx; + for (size_t visited = 0; visited < bitmap_fields; visited++, idx++) { + if (idx >= bitmap_fields) idx = 0; // wrap + if (_mi_bitmap_try_find_claim_field(bitmap, idx, count, bitmap_idx)) { + return true; + } + } + return false; +} + +/* +// Find `count` bits of 0 and set them to 1 atomically; returns `true` on success. +// For now, `count` can be at most MI_BITMAP_FIELD_BITS and will never span fields. +bool _mi_bitmap_try_find_claim(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t count, mi_bitmap_index_t* bitmap_idx) { + return _mi_bitmap_try_find_from_claim(bitmap, bitmap_fields, 0, count, bitmap_idx); +} +*/ + +// Set `count` bits at `bitmap_idx` to 0 atomically +// Returns `true` if all `count` bits were 1 previously. +bool _mi_bitmap_unclaim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) { + const size_t idx = mi_bitmap_index_field(bitmap_idx); + const size_t bitidx = mi_bitmap_index_bit_in_field(bitmap_idx); + const size_t mask = mi_bitmap_mask_(count, bitidx); + mi_assert_internal(bitmap_fields > idx); MI_UNUSED(bitmap_fields); + // mi_assert_internal((bitmap[idx] & mask) == mask); + size_t prev = mi_atomic_and_acq_rel(&bitmap[idx], ~mask); + return ((prev & mask) == mask); +} + + +// Set `count` bits at `bitmap_idx` to 1 atomically +// Returns `true` if all `count` bits were 0 previously. `any_zero` is `true` if there was at least one zero bit. +bool _mi_bitmap_claim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx, bool* any_zero) { + const size_t idx = mi_bitmap_index_field(bitmap_idx); + const size_t bitidx = mi_bitmap_index_bit_in_field(bitmap_idx); + const size_t mask = mi_bitmap_mask_(count, bitidx); + mi_assert_internal(bitmap_fields > idx); MI_UNUSED(bitmap_fields); + //mi_assert_internal(any_zero != NULL || (bitmap[idx] & mask) == 0); + size_t prev = mi_atomic_or_acq_rel(&bitmap[idx], mask); + if (any_zero != NULL) *any_zero = ((prev & mask) != mask); + return ((prev & mask) == 0); +} + +// Returns `true` if all `count` bits were 1. `any_ones` is `true` if there was at least one bit set to one. +static bool mi_bitmap_is_claimedx(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx, bool* any_ones) { + const size_t idx = mi_bitmap_index_field(bitmap_idx); + const size_t bitidx = mi_bitmap_index_bit_in_field(bitmap_idx); + const size_t mask = mi_bitmap_mask_(count, bitidx); + mi_assert_internal(bitmap_fields > idx); MI_UNUSED(bitmap_fields); + size_t field = mi_atomic_load_relaxed(&bitmap[idx]); + if (any_ones != NULL) *any_ones = ((field & mask) != 0); + return ((field & mask) == mask); +} + +bool _mi_bitmap_is_claimed(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) { + return mi_bitmap_is_claimedx(bitmap, bitmap_fields, count, bitmap_idx, NULL); +} + +bool _mi_bitmap_is_any_claimed(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) { + bool any_ones; + mi_bitmap_is_claimedx(bitmap, bitmap_fields, count, bitmap_idx, &any_ones); + return any_ones; +} + + +//-------------------------------------------------------------------------- +// the `_across` functions work on bitmaps where sequences can cross over +// between the fields. This is used in arena allocation +//-------------------------------------------------------------------------- + +// Try to atomically claim a sequence of `count` bits starting from the field +// at `idx` in `bitmap` and crossing into subsequent fields. Returns `true` on success. +static bool mi_bitmap_try_find_claim_field_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t idx, const size_t count, const size_t retries, mi_bitmap_index_t* bitmap_idx) +{ + mi_assert_internal(bitmap_idx != NULL); + + // check initial trailing zeros + mi_bitmap_field_t* field = &bitmap[idx]; + size_t map = mi_atomic_load_relaxed(field); + const size_t initial = mi_clz(map); // count of initial zeros starting at idx + mi_assert_internal(initial <= MI_BITMAP_FIELD_BITS); + if (initial == 0) return false; + if (initial >= count) return _mi_bitmap_try_find_claim_field(bitmap, idx, count, bitmap_idx); // no need to cross fields + if (_mi_divide_up(count - initial, MI_BITMAP_FIELD_BITS) >= (bitmap_fields - idx)) return false; // not enough entries + + // scan ahead + size_t found = initial; + size_t mask = 0; // mask bits for the final field + while(found < count) { + field++; + map = mi_atomic_load_relaxed(field); + const size_t mask_bits = (found + MI_BITMAP_FIELD_BITS <= count ? MI_BITMAP_FIELD_BITS : (count - found)); + mask = mi_bitmap_mask_(mask_bits, 0); + if ((map & mask) != 0) return false; + found += mask_bits; + } + mi_assert_internal(field < &bitmap[bitmap_fields]); + + // found range of zeros up to the final field; mask contains mask in the final field + // now claim it atomically + mi_bitmap_field_t* const final_field = field; + const size_t final_mask = mask; + mi_bitmap_field_t* const initial_field = &bitmap[idx]; + const size_t initial_mask = mi_bitmap_mask_(initial, MI_BITMAP_FIELD_BITS - initial); + + // initial field + size_t newmap; + field = initial_field; + map = mi_atomic_load_relaxed(field); + do { + newmap = map | initial_mask; + if ((map & initial_mask) != 0) { goto rollback; }; + } while (!mi_atomic_cas_strong_acq_rel(field, &map, newmap)); + + // intermediate fields + while (++field < final_field) { + newmap = MI_BITMAP_FIELD_FULL; + map = 0; + if (!mi_atomic_cas_strong_acq_rel(field, &map, newmap)) { goto rollback; } + } + + // final field + mi_assert_internal(field == final_field); + map = mi_atomic_load_relaxed(field); + do { + newmap = map | final_mask; + if ((map & final_mask) != 0) { goto rollback; } + } while (!mi_atomic_cas_strong_acq_rel(field, &map, newmap)); + + // claimed! + *bitmap_idx = mi_bitmap_index_create(idx, MI_BITMAP_FIELD_BITS - initial); + return true; + +rollback: + // roll back intermediate fields + while (--field > initial_field) { + newmap = 0; + map = MI_BITMAP_FIELD_FULL; + mi_assert_internal(mi_atomic_load_relaxed(field) == map); + mi_atomic_store_release(field, newmap); + } + if (field == initial_field) { + map = mi_atomic_load_relaxed(field); + do { + mi_assert_internal((map & initial_mask) == initial_mask); + newmap = map & ~initial_mask; + } while (!mi_atomic_cas_strong_acq_rel(field, &map, newmap)); + } + // retry? (we make a recursive call instead of goto to be able to use const declarations) + if (retries < 4) { + return mi_bitmap_try_find_claim_field_across(bitmap, bitmap_fields, idx, count, retries+1, bitmap_idx); + } + else { + return false; + } +} + + +// Find `count` bits of zeros and set them to 1 atomically; returns `true` on success. +// Starts at idx, and wraps around to search in all `bitmap_fields` fields. +bool _mi_bitmap_try_find_from_claim_across(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx) { + mi_assert_internal(count > 0); + if (count==1) return _mi_bitmap_try_find_from_claim(bitmap, bitmap_fields, start_field_idx, count, bitmap_idx); + size_t idx = start_field_idx; + for (size_t visited = 0; visited < bitmap_fields; visited++, idx++) { + if (idx >= bitmap_fields) idx = 0; // wrap + // try to claim inside the field + if (count <= MI_BITMAP_FIELD_BITS) { + if (_mi_bitmap_try_find_claim_field(bitmap, idx, count, bitmap_idx)) { + return true; + } + } + // try to claim across fields + if (mi_bitmap_try_find_claim_field_across(bitmap, bitmap_fields, idx, count, 0, bitmap_idx)) { + return true; + } + } + return false; +} + +// Helper for masks across fields; returns the mid count, post_mask may be 0 +static size_t mi_bitmap_mask_across(mi_bitmap_index_t bitmap_idx, size_t bitmap_fields, size_t count, size_t* pre_mask, size_t* mid_mask, size_t* post_mask) { + MI_UNUSED_RELEASE(bitmap_fields); + const size_t bitidx = mi_bitmap_index_bit_in_field(bitmap_idx); + if (mi_likely(bitidx + count <= MI_BITMAP_FIELD_BITS)) { + *pre_mask = mi_bitmap_mask_(count, bitidx); + *mid_mask = 0; + *post_mask = 0; + mi_assert_internal(mi_bitmap_index_field(bitmap_idx) < bitmap_fields); + return 0; + } + else { + const size_t pre_bits = MI_BITMAP_FIELD_BITS - bitidx; + mi_assert_internal(pre_bits < count); + *pre_mask = mi_bitmap_mask_(pre_bits, bitidx); + count -= pre_bits; + const size_t mid_count = (count / MI_BITMAP_FIELD_BITS); + *mid_mask = MI_BITMAP_FIELD_FULL; + count %= MI_BITMAP_FIELD_BITS; + *post_mask = (count==0 ? 0 : mi_bitmap_mask_(count, 0)); + mi_assert_internal(mi_bitmap_index_field(bitmap_idx) + mid_count + (count==0 ? 0 : 1) < bitmap_fields); + return mid_count; + } +} + +// Set `count` bits at `bitmap_idx` to 0 atomically +// Returns `true` if all `count` bits were 1 previously. +bool _mi_bitmap_unclaim_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) { + size_t idx = mi_bitmap_index_field(bitmap_idx); + size_t pre_mask; + size_t mid_mask; + size_t post_mask; + size_t mid_count = mi_bitmap_mask_across(bitmap_idx, bitmap_fields, count, &pre_mask, &mid_mask, &post_mask); + bool all_one = true; + mi_bitmap_field_t* field = &bitmap[idx]; + size_t prev = mi_atomic_and_acq_rel(field++, ~pre_mask); + if ((prev & pre_mask) != pre_mask) all_one = false; + while(mid_count-- > 0) { + prev = mi_atomic_and_acq_rel(field++, ~mid_mask); + if ((prev & mid_mask) != mid_mask) all_one = false; + } + if (post_mask!=0) { + prev = mi_atomic_and_acq_rel(field, ~post_mask); + if ((prev & post_mask) != post_mask) all_one = false; + } + return all_one; +} + +// Set `count` bits at `bitmap_idx` to 1 atomically +// Returns `true` if all `count` bits were 0 previously. `any_zero` is `true` if there was at least one zero bit. +bool _mi_bitmap_claim_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx, bool* pany_zero) { + size_t idx = mi_bitmap_index_field(bitmap_idx); + size_t pre_mask; + size_t mid_mask; + size_t post_mask; + size_t mid_count = mi_bitmap_mask_across(bitmap_idx, bitmap_fields, count, &pre_mask, &mid_mask, &post_mask); + bool all_zero = true; + bool any_zero = false; + _Atomic(size_t)*field = &bitmap[idx]; + size_t prev = mi_atomic_or_acq_rel(field++, pre_mask); + if ((prev & pre_mask) != 0) all_zero = false; + if ((prev & pre_mask) != pre_mask) any_zero = true; + while (mid_count-- > 0) { + prev = mi_atomic_or_acq_rel(field++, mid_mask); + if ((prev & mid_mask) != 0) all_zero = false; + if ((prev & mid_mask) != mid_mask) any_zero = true; + } + if (post_mask!=0) { + prev = mi_atomic_or_acq_rel(field, post_mask); + if ((prev & post_mask) != 0) all_zero = false; + if ((prev & post_mask) != post_mask) any_zero = true; + } + if (pany_zero != NULL) *pany_zero = any_zero; + return all_zero; +} + + +// Returns `true` if all `count` bits were 1. +// `any_ones` is `true` if there was at least one bit set to one. +static bool mi_bitmap_is_claimedx_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx, bool* pany_ones) { + size_t idx = mi_bitmap_index_field(bitmap_idx); + size_t pre_mask; + size_t mid_mask; + size_t post_mask; + size_t mid_count = mi_bitmap_mask_across(bitmap_idx, bitmap_fields, count, &pre_mask, &mid_mask, &post_mask); + bool all_ones = true; + bool any_ones = false; + mi_bitmap_field_t* field = &bitmap[idx]; + size_t prev = mi_atomic_load_relaxed(field++); + if ((prev & pre_mask) != pre_mask) all_ones = false; + if ((prev & pre_mask) != 0) any_ones = true; + while (mid_count-- > 0) { + prev = mi_atomic_load_relaxed(field++); + if ((prev & mid_mask) != mid_mask) all_ones = false; + if ((prev & mid_mask) != 0) any_ones = true; + } + if (post_mask!=0) { + prev = mi_atomic_load_relaxed(field); + if ((prev & post_mask) != post_mask) all_ones = false; + if ((prev & post_mask) != 0) any_ones = true; + } + if (pany_ones != NULL) *pany_ones = any_ones; + return all_ones; +} + +bool _mi_bitmap_is_claimed_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) { + return mi_bitmap_is_claimedx_across(bitmap, bitmap_fields, count, bitmap_idx, NULL); +} + +bool _mi_bitmap_is_any_claimed_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) { + bool any_ones; + mi_bitmap_is_claimedx_across(bitmap, bitmap_fields, count, bitmap_idx, &any_ones); + return any_ones; +} diff --git a/compat/mimalloc/bitmap.h b/compat/mimalloc/bitmap.h new file mode 100644 index 00000000000000..e3375033a9326e --- /dev/null +++ b/compat/mimalloc/bitmap.h @@ -0,0 +1,107 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2019-2020 Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +/* ---------------------------------------------------------------------------- +Concurrent bitmap that can set/reset sequences of bits atomically, +represeted as an array of fields where each field is a machine word (`size_t`) + +There are two api's; the standard one cannot have sequences that cross +between the bitmap fields (and a sequence must be <= MI_BITMAP_FIELD_BITS). +(this is used in region allocation) + +The `_across` postfixed functions do allow sequences that can cross over +between the fields. (This is used in arena allocation) +---------------------------------------------------------------------------- */ +#pragma once +#ifndef MI_BITMAP_H +#define MI_BITMAP_H + +/* ----------------------------------------------------------- + Bitmap definition +----------------------------------------------------------- */ + +#define MI_BITMAP_FIELD_BITS (8*MI_SIZE_SIZE) +#define MI_BITMAP_FIELD_FULL (~((size_t)0)) // all bits set + +// An atomic bitmap of `size_t` fields +typedef _Atomic(size_t) mi_bitmap_field_t; +typedef mi_bitmap_field_t* mi_bitmap_t; + +// A bitmap index is the index of the bit in a bitmap. +typedef size_t mi_bitmap_index_t; + +// Create a bit index. +static inline mi_bitmap_index_t mi_bitmap_index_create(size_t idx, size_t bitidx) { + mi_assert_internal(bitidx < MI_BITMAP_FIELD_BITS); + return (idx*MI_BITMAP_FIELD_BITS) + bitidx; +} + +// Create a bit index. +static inline mi_bitmap_index_t mi_bitmap_index_create_from_bit(size_t full_bitidx) { + return mi_bitmap_index_create(full_bitidx / MI_BITMAP_FIELD_BITS, full_bitidx % MI_BITMAP_FIELD_BITS); +} + +// Get the field index from a bit index. +static inline size_t mi_bitmap_index_field(mi_bitmap_index_t bitmap_idx) { + return (bitmap_idx / MI_BITMAP_FIELD_BITS); +} + +// Get the bit index in a bitmap field +static inline size_t mi_bitmap_index_bit_in_field(mi_bitmap_index_t bitmap_idx) { + return (bitmap_idx % MI_BITMAP_FIELD_BITS); +} + +// Get the full bit index +static inline size_t mi_bitmap_index_bit(mi_bitmap_index_t bitmap_idx) { + return bitmap_idx; +} + +/* ----------------------------------------------------------- + Claim a bit sequence atomically +----------------------------------------------------------- */ + +// Try to atomically claim a sequence of `count` bits in a single +// field at `idx` in `bitmap`. Returns `true` on success. +bool _mi_bitmap_try_find_claim_field(mi_bitmap_t bitmap, size_t idx, const size_t count, mi_bitmap_index_t* bitmap_idx); + +// Starts at idx, and wraps around to search in all `bitmap_fields` fields. +// For now, `count` can be at most MI_BITMAP_FIELD_BITS and will never cross fields. +bool _mi_bitmap_try_find_from_claim(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx); + +// Set `count` bits at `bitmap_idx` to 0 atomically +// Returns `true` if all `count` bits were 1 previously. +bool _mi_bitmap_unclaim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx); + +// Set `count` bits at `bitmap_idx` to 1 atomically +// Returns `true` if all `count` bits were 0 previously. `any_zero` is `true` if there was at least one zero bit. +bool _mi_bitmap_claim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx, bool* any_zero); + +bool _mi_bitmap_is_claimed(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx); +bool _mi_bitmap_is_any_claimed(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx); + + +//-------------------------------------------------------------------------- +// the `_across` functions work on bitmaps where sequences can cross over +// between the fields. This is used in arena allocation +//-------------------------------------------------------------------------- + +// Find `count` bits of zeros and set them to 1 atomically; returns `true` on success. +// Starts at idx, and wraps around to search in all `bitmap_fields` fields. +bool _mi_bitmap_try_find_from_claim_across(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx); + +// Set `count` bits at `bitmap_idx` to 0 atomically +// Returns `true` if all `count` bits were 1 previously. +bool _mi_bitmap_unclaim_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx); + +// Set `count` bits at `bitmap_idx` to 1 atomically +// Returns `true` if all `count` bits were 0 previously. `any_zero` is `true` if there was at least one zero bit. +bool _mi_bitmap_claim_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx, bool* pany_zero); + +bool _mi_bitmap_is_claimed_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx); +bool _mi_bitmap_is_any_claimed_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx); + +#endif diff --git a/compat/mimalloc/heap.c b/compat/mimalloc/heap.c new file mode 100644 index 00000000000000..42c6cfd63699db --- /dev/null +++ b/compat/mimalloc/heap.c @@ -0,0 +1,580 @@ +/*---------------------------------------------------------------------------- +Copyright (c) 2018-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include // memset, memcpy + +#if defined(_MSC_VER) && (_MSC_VER < 1920) +#pragma warning(disable:4204) // non-constant aggregate initializer +#endif + +/* ----------------------------------------------------------- + Helpers +----------------------------------------------------------- */ + +// return `true` if ok, `false` to break +typedef bool (heap_page_visitor_fun)(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_t* page, void* arg1, void* arg2); + +// Visit all pages in a heap; returns `false` if break was called. +static bool mi_heap_visit_pages(mi_heap_t* heap, heap_page_visitor_fun* fn, void* arg1, void* arg2) +{ + if (heap==NULL || heap->page_count==0) return 0; + + // visit all pages + #if MI_DEBUG>1 + size_t total = heap->page_count; + #endif + size_t count = 0; + for (size_t i = 0; i <= MI_BIN_FULL; i++) { + mi_page_queue_t* pq = &heap->pages[i]; + mi_page_t* page = pq->first; + while(page != NULL) { + mi_page_t* next = page->next; // save next in case the page gets removed from the queue + mi_assert_internal(mi_page_heap(page) == heap); + count++; + if (!fn(heap, pq, page, arg1, arg2)) return false; + page = next; // and continue + } + } + mi_assert_internal(count == total); + return true; +} + + +#if MI_DEBUG>=2 +static bool mi_heap_page_is_valid(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_t* page, void* arg1, void* arg2) { + MI_UNUSED(arg1); + MI_UNUSED(arg2); + MI_UNUSED(pq); + mi_assert_internal(mi_page_heap(page) == heap); + mi_segment_t* segment = _mi_page_segment(page); + mi_assert_internal(segment->thread_id == heap->thread_id); + mi_assert_expensive(_mi_page_is_valid(page)); + return true; +} +#endif +#if MI_DEBUG>=3 +static bool mi_heap_is_valid(mi_heap_t* heap) { + mi_assert_internal(heap!=NULL); + mi_heap_visit_pages(heap, &mi_heap_page_is_valid, NULL, NULL); + return true; +} +#endif + + + + +/* ----------------------------------------------------------- + "Collect" pages by migrating `local_free` and `thread_free` + lists and freeing empty pages. This is done when a thread + stops (and in that case abandons pages if there are still + blocks alive) +----------------------------------------------------------- */ + +typedef enum mi_collect_e { + MI_NORMAL, + MI_FORCE, + MI_ABANDON +} mi_collect_t; + + +static bool mi_heap_page_collect(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_t* page, void* arg_collect, void* arg2 ) { + MI_UNUSED(arg2); + MI_UNUSED(heap); + mi_assert_internal(mi_heap_page_is_valid(heap, pq, page, NULL, NULL)); + mi_collect_t collect = *((mi_collect_t*)arg_collect); + _mi_page_free_collect(page, collect >= MI_FORCE); + if (mi_page_all_free(page)) { + // no more used blocks, free the page. + // note: this will free retired pages as well. + _mi_page_free(page, pq, collect >= MI_FORCE); + } + else if (collect == MI_ABANDON) { + // still used blocks but the thread is done; abandon the page + _mi_page_abandon(page, pq); + } + return true; // don't break +} + +static bool mi_heap_page_never_delayed_free(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_t* page, void* arg1, void* arg2) { + MI_UNUSED(arg1); + MI_UNUSED(arg2); + MI_UNUSED(heap); + MI_UNUSED(pq); + _mi_page_use_delayed_free(page, MI_NEVER_DELAYED_FREE, false); + return true; // don't break +} + +static void mi_heap_collect_ex(mi_heap_t* heap, mi_collect_t collect) +{ + if (heap==NULL || !mi_heap_is_initialized(heap)) return; + + const bool force = collect >= MI_FORCE; + _mi_deferred_free(heap, force); + + // note: never reclaim on collect but leave it to threads that need storage to reclaim + const bool force_main = + #ifdef NDEBUG + collect == MI_FORCE + #else + collect >= MI_FORCE + #endif + && _mi_is_main_thread() && mi_heap_is_backing(heap) && !heap->no_reclaim; + + if (force_main) { + // the main thread is abandoned (end-of-program), try to reclaim all abandoned segments. + // if all memory is freed by now, all segments should be freed. + _mi_abandoned_reclaim_all(heap, &heap->tld->segments); + } + + // if abandoning, mark all pages to no longer add to delayed_free + if (collect == MI_ABANDON) { + mi_heap_visit_pages(heap, &mi_heap_page_never_delayed_free, NULL, NULL); + } + + // free thread delayed blocks. + // (if abandoning, after this there are no more thread-delayed references into the pages.) + _mi_heap_delayed_free(heap); + + // collect retired pages + _mi_heap_collect_retired(heap, force); + + // collect all pages owned by this thread + mi_heap_visit_pages(heap, &mi_heap_page_collect, &collect, NULL); + mi_assert_internal( collect != MI_ABANDON || mi_atomic_load_ptr_acquire(mi_block_t,&heap->thread_delayed_free) == NULL ); + + // collect abandoned segments (in particular, decommit expired parts of segments in the abandoned segment list) + // note: forced decommit can be quite expensive if many threads are created/destroyed so we do not force on abandonment + _mi_abandoned_collect(heap, collect == MI_FORCE /* force? */, &heap->tld->segments); + + // collect segment local caches + if (force) { + _mi_segment_thread_collect(&heap->tld->segments); + } + + // decommit in global segment caches + // note: forced decommit can be quite expensive if many threads are created/destroyed so we do not force on abandonment + _mi_segment_cache_collect( collect == MI_FORCE, &heap->tld->os); + + // collect regions on program-exit (or shared library unload) + if (force && _mi_is_main_thread() && mi_heap_is_backing(heap)) { + //_mi_mem_collect(&heap->tld->os); + } +} + +void _mi_heap_collect_abandon(mi_heap_t* heap) { + mi_heap_collect_ex(heap, MI_ABANDON); +} + +void mi_heap_collect(mi_heap_t* heap, bool force) mi_attr_noexcept { + mi_heap_collect_ex(heap, (force ? MI_FORCE : MI_NORMAL)); +} + +void mi_collect(bool force) mi_attr_noexcept { + mi_heap_collect(mi_get_default_heap(), force); +} + + +/* ----------------------------------------------------------- + Heap new +----------------------------------------------------------- */ + +mi_heap_t* mi_heap_get_default(void) { + mi_thread_init(); + return mi_get_default_heap(); +} + +mi_heap_t* mi_heap_get_backing(void) { + mi_heap_t* heap = mi_heap_get_default(); + mi_assert_internal(heap!=NULL); + mi_heap_t* bheap = heap->tld->heap_backing; + mi_assert_internal(bheap!=NULL); + mi_assert_internal(bheap->thread_id == _mi_thread_id()); + return bheap; +} + +mi_heap_t* mi_heap_new(void) { + mi_heap_t* bheap = mi_heap_get_backing(); + mi_heap_t* heap = mi_heap_malloc_tp(bheap, mi_heap_t); // todo: OS allocate in secure mode? + if (heap==NULL) return NULL; + _mi_memcpy_aligned(heap, &_mi_heap_empty, sizeof(mi_heap_t)); + heap->tld = bheap->tld; + heap->thread_id = _mi_thread_id(); + _mi_random_split(&bheap->random, &heap->random); + heap->cookie = _mi_heap_random_next(heap) | 1; + heap->keys[0] = _mi_heap_random_next(heap); + heap->keys[1] = _mi_heap_random_next(heap); + heap->no_reclaim = true; // don't reclaim abandoned pages or otherwise destroy is unsafe + // push on the thread local heaps list + heap->next = heap->tld->heaps; + heap->tld->heaps = heap; + return heap; +} + +uintptr_t _mi_heap_random_next(mi_heap_t* heap) { + return _mi_random_next(&heap->random); +} + +// zero out the page queues +static void mi_heap_reset_pages(mi_heap_t* heap) { + mi_assert_internal(heap != NULL); + mi_assert_internal(mi_heap_is_initialized(heap)); + // TODO: copy full empty heap instead? + memset(&heap->pages_free_direct, 0, sizeof(heap->pages_free_direct)); +#ifdef MI_MEDIUM_DIRECT + memset(&heap->pages_free_medium, 0, sizeof(heap->pages_free_medium)); +#endif + _mi_memcpy_aligned(&heap->pages, &_mi_heap_empty.pages, sizeof(heap->pages)); + heap->thread_delayed_free = NULL; + heap->page_count = 0; +} + +// called from `mi_heap_destroy` and `mi_heap_delete` to free the internal heap resources. +static void mi_heap_free(mi_heap_t* heap) { + mi_assert(heap != NULL); + mi_assert_internal(mi_heap_is_initialized(heap)); + if (heap==NULL || !mi_heap_is_initialized(heap)) return; + if (mi_heap_is_backing(heap)) return; // dont free the backing heap + + // reset default + if (mi_heap_is_default(heap)) { + _mi_heap_set_default_direct(heap->tld->heap_backing); + } + + // remove ourselves from the thread local heaps list + // linear search but we expect the number of heaps to be relatively small + mi_heap_t* prev = NULL; + mi_heap_t* curr = heap->tld->heaps; + while (curr != heap && curr != NULL) { + prev = curr; + curr = curr->next; + } + mi_assert_internal(curr == heap); + if (curr == heap) { + if (prev != NULL) { prev->next = heap->next; } + else { heap->tld->heaps = heap->next; } + } + mi_assert_internal(heap->tld->heaps != NULL); + + // and free the used memory + mi_free(heap); +} + + +/* ----------------------------------------------------------- + Heap destroy +----------------------------------------------------------- */ + +static bool _mi_heap_page_destroy(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_t* page, void* arg1, void* arg2) { + MI_UNUSED(arg1); + MI_UNUSED(arg2); + MI_UNUSED(heap); + MI_UNUSED(pq); + + // ensure no more thread_delayed_free will be added + _mi_page_use_delayed_free(page, MI_NEVER_DELAYED_FREE, false); + + // stats + const size_t bsize = mi_page_block_size(page); + if (bsize > MI_MEDIUM_OBJ_SIZE_MAX) { + if (bsize <= MI_LARGE_OBJ_SIZE_MAX) { + mi_heap_stat_decrease(heap, large, bsize); + } + else { + mi_heap_stat_decrease(heap, huge, bsize); + } + } +#if (MI_STAT) + _mi_page_free_collect(page, false); // update used count + const size_t inuse = page->used; + if (bsize <= MI_LARGE_OBJ_SIZE_MAX) { + mi_heap_stat_decrease(heap, normal, bsize * inuse); +#if (MI_STAT>1) + mi_heap_stat_decrease(heap, normal_bins[_mi_bin(bsize)], inuse); +#endif + } + mi_heap_stat_decrease(heap, malloc, bsize * inuse); // todo: off for aligned blocks... +#endif + + /// pretend it is all free now + mi_assert_internal(mi_page_thread_free(page) == NULL); + page->used = 0; + + // and free the page + // mi_page_free(page,false); + page->next = NULL; + page->prev = NULL; + _mi_segment_page_free(page,false /* no force? */, &heap->tld->segments); + + return true; // keep going +} + +void _mi_heap_destroy_pages(mi_heap_t* heap) { + mi_heap_visit_pages(heap, &_mi_heap_page_destroy, NULL, NULL); + mi_heap_reset_pages(heap); +} + +void mi_heap_destroy(mi_heap_t* heap) { + mi_assert(heap != NULL); + mi_assert(mi_heap_is_initialized(heap)); + mi_assert(heap->no_reclaim); + mi_assert_expensive(mi_heap_is_valid(heap)); + if (heap==NULL || !mi_heap_is_initialized(heap)) return; + if (!heap->no_reclaim) { + // don't free in case it may contain reclaimed pages + mi_heap_delete(heap); + } + else { + // free all pages + _mi_heap_destroy_pages(heap); + mi_heap_free(heap); + } +} + + + +/* ----------------------------------------------------------- + Safe Heap delete +----------------------------------------------------------- */ + +// Transfer the pages from one heap to the other +static void mi_heap_absorb(mi_heap_t* heap, mi_heap_t* from) { + mi_assert_internal(heap!=NULL); + if (from==NULL || from->page_count == 0) return; + + // reduce the size of the delayed frees + _mi_heap_delayed_free(from); + + // transfer all pages by appending the queues; this will set a new heap field + // so threads may do delayed frees in either heap for a while. + // note: appending waits for each page to not be in the `MI_DELAYED_FREEING` state + // so after this only the new heap will get delayed frees + for (size_t i = 0; i <= MI_BIN_FULL; i++) { + mi_page_queue_t* pq = &heap->pages[i]; + mi_page_queue_t* append = &from->pages[i]; + size_t pcount = _mi_page_queue_append(heap, pq, append); + heap->page_count += pcount; + from->page_count -= pcount; + } + mi_assert_internal(from->page_count == 0); + + // and do outstanding delayed frees in the `from` heap + // note: be careful here as the `heap` field in all those pages no longer point to `from`, + // turns out to be ok as `_mi_heap_delayed_free` only visits the list and calls a + // the regular `_mi_free_delayed_block` which is safe. + _mi_heap_delayed_free(from); + #if !defined(_MSC_VER) || (_MSC_VER > 1900) // somehow the following line gives an error in VS2015, issue #353 + mi_assert_internal(mi_atomic_load_ptr_relaxed(mi_block_t,&from->thread_delayed_free) == NULL); + #endif + + // and reset the `from` heap + mi_heap_reset_pages(from); +} + +// Safe delete a heap without freeing any still allocated blocks in that heap. +void mi_heap_delete(mi_heap_t* heap) +{ + mi_assert(heap != NULL); + mi_assert(mi_heap_is_initialized(heap)); + mi_assert_expensive(mi_heap_is_valid(heap)); + if (heap==NULL || !mi_heap_is_initialized(heap)) return; + + if (!mi_heap_is_backing(heap)) { + // tranfer still used pages to the backing heap + mi_heap_absorb(heap->tld->heap_backing, heap); + } + else { + // the backing heap abandons its pages + _mi_heap_collect_abandon(heap); + } + mi_assert_internal(heap->page_count==0); + mi_heap_free(heap); +} + +mi_heap_t* mi_heap_set_default(mi_heap_t* heap) { + mi_assert(heap != NULL); + mi_assert(mi_heap_is_initialized(heap)); + if (heap==NULL || !mi_heap_is_initialized(heap)) return NULL; + mi_assert_expensive(mi_heap_is_valid(heap)); + mi_heap_t* old = mi_get_default_heap(); + _mi_heap_set_default_direct(heap); + return old; +} + + + + +/* ----------------------------------------------------------- + Analysis +----------------------------------------------------------- */ + +// static since it is not thread safe to access heaps from other threads. +static mi_heap_t* mi_heap_of_block(const void* p) { + if (p == NULL) return NULL; + mi_segment_t* segment = _mi_ptr_segment(p); + bool valid = (_mi_ptr_cookie(segment) == segment->cookie); + mi_assert_internal(valid); + if (mi_unlikely(!valid)) return NULL; + return mi_page_heap(_mi_segment_page_of(segment,p)); +} + +bool mi_heap_contains_block(mi_heap_t* heap, const void* p) { + mi_assert(heap != NULL); + if (heap==NULL || !mi_heap_is_initialized(heap)) return false; + return (heap == mi_heap_of_block(p)); +} + + +static bool mi_heap_page_check_owned(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_t* page, void* p, void* vfound) { + MI_UNUSED(heap); + MI_UNUSED(pq); + bool* found = (bool*)vfound; + mi_segment_t* segment = _mi_page_segment(page); + void* start = _mi_page_start(segment, page, NULL); + void* end = (uint8_t*)start + (page->capacity * mi_page_block_size(page)); + *found = (p >= start && p < end); + return (!*found); // continue if not found +} + +bool mi_heap_check_owned(mi_heap_t* heap, const void* p) { + mi_assert(heap != NULL); + if (heap==NULL || !mi_heap_is_initialized(heap)) return false; + if (((uintptr_t)p & (MI_INTPTR_SIZE - 1)) != 0) return false; // only aligned pointers + bool found = false; + mi_heap_visit_pages(heap, &mi_heap_page_check_owned, (void*)p, &found); + return found; +} + +bool mi_check_owned(const void* p) { + return mi_heap_check_owned(mi_get_default_heap(), p); +} + +/* ----------------------------------------------------------- + Visit all heap blocks and areas + Todo: enable visiting abandoned pages, and + enable visiting all blocks of all heaps across threads +----------------------------------------------------------- */ + +// Separate struct to keep `mi_page_t` out of the public interface +typedef struct mi_heap_area_ex_s { + mi_heap_area_t area; + mi_page_t* page; +} mi_heap_area_ex_t; + +static bool mi_heap_area_visit_blocks(const mi_heap_area_ex_t* xarea, mi_block_visit_fun* visitor, void* arg) { + mi_assert(xarea != NULL); + if (xarea==NULL) return true; + const mi_heap_area_t* area = &xarea->area; + mi_page_t* page = xarea->page; + mi_assert(page != NULL); + if (page == NULL) return true; + + _mi_page_free_collect(page,true); + mi_assert_internal(page->local_free == NULL); + if (page->used == 0) return true; + + const size_t bsize = mi_page_block_size(page); + const size_t ubsize = mi_page_usable_block_size(page); // without padding + size_t psize; + uint8_t* pstart = _mi_page_start(_mi_page_segment(page), page, &psize); + + if (page->capacity == 1) { + // optimize page with one block + mi_assert_internal(page->used == 1 && page->free == NULL); + return visitor(mi_page_heap(page), area, pstart, ubsize, arg); + } + + // create a bitmap of free blocks. + #define MI_MAX_BLOCKS (MI_SMALL_PAGE_SIZE / sizeof(void*)) + uintptr_t free_map[MI_MAX_BLOCKS / sizeof(uintptr_t)]; + memset(free_map, 0, sizeof(free_map)); + + size_t free_count = 0; + for (mi_block_t* block = page->free; block != NULL; block = mi_block_next(page,block)) { + free_count++; + mi_assert_internal((uint8_t*)block >= pstart && (uint8_t*)block < (pstart + psize)); + size_t offset = (uint8_t*)block - pstart; + mi_assert_internal(offset % bsize == 0); + size_t blockidx = offset / bsize; // Todo: avoid division? + mi_assert_internal( blockidx < MI_MAX_BLOCKS); + size_t bitidx = (blockidx / sizeof(uintptr_t)); + size_t bit = blockidx - (bitidx * sizeof(uintptr_t)); + free_map[bitidx] |= ((uintptr_t)1 << bit); + } + mi_assert_internal(page->capacity == (free_count + page->used)); + + // walk through all blocks skipping the free ones + size_t used_count = 0; + for (size_t i = 0; i < page->capacity; i++) { + size_t bitidx = (i / sizeof(uintptr_t)); + size_t bit = i - (bitidx * sizeof(uintptr_t)); + uintptr_t m = free_map[bitidx]; + if (bit == 0 && m == UINTPTR_MAX) { + i += (sizeof(uintptr_t) - 1); // skip a run of free blocks + } + else if ((m & ((uintptr_t)1 << bit)) == 0) { + used_count++; + uint8_t* block = pstart + (i * bsize); + if (!visitor(mi_page_heap(page), area, block, ubsize, arg)) return false; + } + } + mi_assert_internal(page->used == used_count); + return true; +} + +typedef bool (mi_heap_area_visit_fun)(const mi_heap_t* heap, const mi_heap_area_ex_t* area, void* arg); + + +static bool mi_heap_visit_areas_page(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_t* page, void* vfun, void* arg) { + MI_UNUSED(heap); + MI_UNUSED(pq); + mi_heap_area_visit_fun* fun = (mi_heap_area_visit_fun*)vfun; + mi_heap_area_ex_t xarea; + const size_t bsize = mi_page_block_size(page); + const size_t ubsize = mi_page_usable_block_size(page); + xarea.page = page; + xarea.area.reserved = page->reserved * bsize; + xarea.area.committed = page->capacity * bsize; + xarea.area.blocks = _mi_page_start(_mi_page_segment(page), page, NULL); + xarea.area.used = page->used * bsize; + xarea.area.block_size = ubsize; + xarea.area.full_block_size = bsize; + return fun(heap, &xarea, arg); +} + +// Visit all heap pages as areas +static bool mi_heap_visit_areas(const mi_heap_t* heap, mi_heap_area_visit_fun* visitor, void* arg) { + if (visitor == NULL) return false; + return mi_heap_visit_pages((mi_heap_t*)heap, &mi_heap_visit_areas_page, (void*)(visitor), arg); // note: function pointer to void* :-{ +} + +// Just to pass arguments +typedef struct mi_visit_blocks_args_s { + bool visit_blocks; + mi_block_visit_fun* visitor; + void* arg; +} mi_visit_blocks_args_t; + +static bool mi_heap_area_visitor(const mi_heap_t* heap, const mi_heap_area_ex_t* xarea, void* arg) { + mi_visit_blocks_args_t* args = (mi_visit_blocks_args_t*)arg; + if (!args->visitor(heap, &xarea->area, NULL, xarea->area.block_size, args->arg)) return false; + if (args->visit_blocks) { + return mi_heap_area_visit_blocks(xarea, args->visitor, args->arg); + } + else { + return true; + } +} + +// Visit all blocks in a heap +bool mi_heap_visit_blocks(const mi_heap_t* heap, bool visit_blocks, mi_block_visit_fun* visitor, void* arg) { + mi_visit_blocks_args_t args = { visit_blocks, visitor, arg }; + return mi_heap_visit_areas(heap, &mi_heap_area_visitor, &args); +} diff --git a/compat/mimalloc/init.c b/compat/mimalloc/init.c new file mode 100644 index 00000000000000..6b2a99e47a6180 --- /dev/null +++ b/compat/mimalloc/init.c @@ -0,0 +1,693 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2022, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#include "mimalloc.h" +#include "mimalloc-internal.h" + +#include // memcpy, memset +#include // atexit + +// Empty page used to initialize the small free pages array +const mi_page_t _mi_page_empty = { + 0, false, false, false, false, + 0, // capacity + 0, // reserved capacity + { 0 }, // flags + false, // is_zero + 0, // retire_expire + NULL, // free + #if MI_ENCODE_FREELIST + { 0, 0 }, + #endif + 0, // used + 0, // xblock_size + NULL, // local_free + MI_ATOMIC_VAR_INIT(0), // xthread_free + MI_ATOMIC_VAR_INIT(0), // xheap + NULL, NULL + #if MI_INTPTR_SIZE==8 + , { 0 } // padding + #endif +}; + +#define MI_PAGE_EMPTY() ((mi_page_t*)&_mi_page_empty) + +#if (MI_PADDING>0) && (MI_INTPTR_SIZE >= 8) +#define MI_SMALL_PAGES_EMPTY { MI_INIT128(MI_PAGE_EMPTY), MI_PAGE_EMPTY(), MI_PAGE_EMPTY() } +#elif (MI_PADDING>0) +#define MI_SMALL_PAGES_EMPTY { MI_INIT128(MI_PAGE_EMPTY), MI_PAGE_EMPTY(), MI_PAGE_EMPTY(), MI_PAGE_EMPTY() } +#else +#define MI_SMALL_PAGES_EMPTY { MI_INIT128(MI_PAGE_EMPTY), MI_PAGE_EMPTY() } +#endif + + +// Empty page queues for every bin +#define QNULL(sz) { NULL, NULL, (sz)*sizeof(uintptr_t) } +#define MI_PAGE_QUEUES_EMPTY \ + { QNULL(1), \ + QNULL( 1), QNULL( 2), QNULL( 3), QNULL( 4), QNULL( 5), QNULL( 6), QNULL( 7), QNULL( 8), /* 8 */ \ + QNULL( 10), QNULL( 12), QNULL( 14), QNULL( 16), QNULL( 20), QNULL( 24), QNULL( 28), QNULL( 32), /* 16 */ \ + QNULL( 40), QNULL( 48), QNULL( 56), QNULL( 64), QNULL( 80), QNULL( 96), QNULL( 112), QNULL( 128), /* 24 */ \ + QNULL( 160), QNULL( 192), QNULL( 224), QNULL( 256), QNULL( 320), QNULL( 384), QNULL( 448), QNULL( 512), /* 32 */ \ + QNULL( 640), QNULL( 768), QNULL( 896), QNULL( 1024), QNULL( 1280), QNULL( 1536), QNULL( 1792), QNULL( 2048), /* 40 */ \ + QNULL( 2560), QNULL( 3072), QNULL( 3584), QNULL( 4096), QNULL( 5120), QNULL( 6144), QNULL( 7168), QNULL( 8192), /* 48 */ \ + QNULL( 10240), QNULL( 12288), QNULL( 14336), QNULL( 16384), QNULL( 20480), QNULL( 24576), QNULL( 28672), QNULL( 32768), /* 56 */ \ + QNULL( 40960), QNULL( 49152), QNULL( 57344), QNULL( 65536), QNULL( 81920), QNULL( 98304), QNULL(114688), QNULL(131072), /* 64 */ \ + QNULL(163840), QNULL(196608), QNULL(229376), QNULL(262144), QNULL(327680), QNULL(393216), QNULL(458752), QNULL(524288), /* 72 */ \ + QNULL(MI_MEDIUM_OBJ_WSIZE_MAX + 1 /* 655360, Huge queue */), \ + QNULL(MI_MEDIUM_OBJ_WSIZE_MAX + 2) /* Full queue */ } + +#define MI_STAT_COUNT_NULL() {0,0,0,0} + +// Empty statistics +#if MI_STAT>1 +#define MI_STAT_COUNT_END_NULL() , { MI_STAT_COUNT_NULL(), MI_INIT32(MI_STAT_COUNT_NULL) } +#else +#define MI_STAT_COUNT_END_NULL() +#endif + +#define MI_STATS_NULL \ + MI_STAT_COUNT_NULL(), MI_STAT_COUNT_NULL(), \ + MI_STAT_COUNT_NULL(), MI_STAT_COUNT_NULL(), \ + MI_STAT_COUNT_NULL(), MI_STAT_COUNT_NULL(), \ + MI_STAT_COUNT_NULL(), MI_STAT_COUNT_NULL(), \ + MI_STAT_COUNT_NULL(), MI_STAT_COUNT_NULL(), \ + MI_STAT_COUNT_NULL(), MI_STAT_COUNT_NULL(), \ + MI_STAT_COUNT_NULL(), MI_STAT_COUNT_NULL(), \ + { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \ + { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } \ + MI_STAT_COUNT_END_NULL() + + +// Empty slice span queues for every bin +#define SQNULL(sz) { NULL, NULL, sz } +#define MI_SEGMENT_SPAN_QUEUES_EMPTY \ + { SQNULL(1), \ + SQNULL( 1), SQNULL( 2), SQNULL( 3), SQNULL( 4), SQNULL( 5), SQNULL( 6), SQNULL( 7), SQNULL( 10), /* 8 */ \ + SQNULL( 12), SQNULL( 14), SQNULL( 16), SQNULL( 20), SQNULL( 24), SQNULL( 28), SQNULL( 32), SQNULL( 40), /* 16 */ \ + SQNULL( 48), SQNULL( 56), SQNULL( 64), SQNULL( 80), SQNULL( 96), SQNULL( 112), SQNULL( 128), SQNULL( 160), /* 24 */ \ + SQNULL( 192), SQNULL( 224), SQNULL( 256), SQNULL( 320), SQNULL( 384), SQNULL( 448), SQNULL( 512), SQNULL( 640), /* 32 */ \ + SQNULL( 768), SQNULL( 896), SQNULL( 1024) /* 35 */ } + + +// -------------------------------------------------------- +// Statically allocate an empty heap as the initial +// thread local value for the default heap, +// and statically allocate the backing heap for the main +// thread so it can function without doing any allocation +// itself (as accessing a thread local for the first time +// may lead to allocation itself on some platforms) +// -------------------------------------------------------- + +mi_decl_cache_align const mi_heap_t _mi_heap_empty = { + NULL, + MI_SMALL_PAGES_EMPTY, + MI_PAGE_QUEUES_EMPTY, + MI_ATOMIC_VAR_INIT(NULL), + 0, // tid + 0, // cookie + { 0, 0 }, // keys + { {0}, {0}, 0 }, + 0, // page count + MI_BIN_FULL, 0, // page retired min/max + NULL, // next + false +}; + +#define tld_empty_stats ((mi_stats_t*)((uint8_t*)&tld_empty + offsetof(mi_tld_t,stats))) +#define tld_empty_os ((mi_os_tld_t*)((uint8_t*)&tld_empty + offsetof(mi_tld_t,os))) + +mi_decl_cache_align static const mi_tld_t tld_empty = { + 0, + false, + NULL, NULL, + { MI_SEGMENT_SPAN_QUEUES_EMPTY, 0, 0, 0, 0, tld_empty_stats, tld_empty_os }, // segments + { 0, tld_empty_stats }, // os + { MI_STATS_NULL } // stats +}; + +// the thread-local default heap for allocation +mi_decl_thread mi_heap_t* _mi_heap_default = (mi_heap_t*)&_mi_heap_empty; + +extern mi_heap_t _mi_heap_main; + +static mi_tld_t tld_main = { + 0, false, + &_mi_heap_main, & _mi_heap_main, + { MI_SEGMENT_SPAN_QUEUES_EMPTY, 0, 0, 0, 0, &tld_main.stats, &tld_main.os }, // segments + { 0, &tld_main.stats }, // os + { MI_STATS_NULL } // stats +}; + +mi_heap_t _mi_heap_main = { + &tld_main, + MI_SMALL_PAGES_EMPTY, + MI_PAGE_QUEUES_EMPTY, + MI_ATOMIC_VAR_INIT(NULL), + 0, // thread id + 0, // initial cookie + { 0, 0 }, // the key of the main heap can be fixed (unlike page keys that need to be secure!) + { {0x846ca68b}, {0}, 0 }, // random + 0, // page count + MI_BIN_FULL, 0, // page retired min/max + NULL, // next heap + false // can reclaim +}; + +bool _mi_process_is_initialized = false; // set to `true` in `mi_process_init`. + +mi_stats_t _mi_stats_main = { MI_STATS_NULL }; + + +static void mi_heap_main_init(void) { + if (_mi_heap_main.cookie == 0) { + _mi_heap_main.thread_id = _mi_thread_id(); + _mi_heap_main.cookie = _mi_os_random_weak((uintptr_t)&mi_heap_main_init); + _mi_random_init(&_mi_heap_main.random); + _mi_heap_main.keys[0] = _mi_heap_random_next(&_mi_heap_main); + _mi_heap_main.keys[1] = _mi_heap_random_next(&_mi_heap_main); + } +} + +mi_heap_t* _mi_heap_main_get(void) { + mi_heap_main_init(); + return &_mi_heap_main; +} + + +/* ----------------------------------------------------------- + Initialization and freeing of the thread local heaps +----------------------------------------------------------- */ + +// note: in x64 in release build `sizeof(mi_thread_data_t)` is under 4KiB (= OS page size). +typedef struct mi_thread_data_s { + mi_heap_t heap; // must come first due to cast in `_mi_heap_done` + mi_tld_t tld; +} mi_thread_data_t; + + +// Thread meta-data is allocated directly from the OS. For +// some programs that do not use thread pools and allocate and +// destroy many OS threads, this may causes too much overhead +// per thread so we maintain a small cache of recently freed metadata. + +#define TD_CACHE_SIZE (8) +static _Atomic(mi_thread_data_t*) td_cache[TD_CACHE_SIZE]; + +static mi_thread_data_t* mi_thread_data_alloc(void) { + // try to find thread metadata in the cache + mi_thread_data_t* td; + for (int i = 0; i < TD_CACHE_SIZE; i++) { + td = mi_atomic_load_ptr_relaxed(mi_thread_data_t, &td_cache[i]); + if (td != NULL) { + td = mi_atomic_exchange_ptr_acq_rel(mi_thread_data_t, &td_cache[i], NULL); + if (td != NULL) { + return td; + } + } + } + // if that fails, allocate directly from the OS + td = (mi_thread_data_t*)_mi_os_alloc(sizeof(mi_thread_data_t), &_mi_stats_main); + if (td == NULL) { + // if this fails, try once more. (issue #257) + td = (mi_thread_data_t*)_mi_os_alloc(sizeof(mi_thread_data_t), &_mi_stats_main); + if (td == NULL) { + // really out of memory + _mi_error_message(ENOMEM, "unable to allocate thread local heap metadata (%zu bytes)\n", sizeof(mi_thread_data_t)); + } + } + return td; +} + +static void mi_thread_data_free( mi_thread_data_t* tdfree ) { + // try to add the thread metadata to the cache + for (int i = 0; i < TD_CACHE_SIZE; i++) { + mi_thread_data_t* td = mi_atomic_load_ptr_relaxed(mi_thread_data_t, &td_cache[i]); + if (td == NULL) { + mi_thread_data_t* expected = NULL; + if (mi_atomic_cas_ptr_weak_acq_rel(mi_thread_data_t, &td_cache[i], &expected, tdfree)) { + return; + } + } + } + // if that fails, just free it directly + _mi_os_free(tdfree, sizeof(mi_thread_data_t), &_mi_stats_main); +} + +static void mi_thread_data_collect(void) { + // free all thread metadata from the cache + for (int i = 0; i < TD_CACHE_SIZE; i++) { + mi_thread_data_t* td = mi_atomic_load_ptr_relaxed(mi_thread_data_t, &td_cache[i]); + if (td != NULL) { + td = mi_atomic_exchange_ptr_acq_rel(mi_thread_data_t, &td_cache[i], NULL); + if (td != NULL) { + _mi_os_free( td, sizeof(mi_thread_data_t), &_mi_stats_main ); + } + } + } +} + +// Initialize the thread local default heap, called from `mi_thread_init` +static bool _mi_heap_init(void) { + if (mi_heap_is_initialized(mi_get_default_heap())) return true; + if (_mi_is_main_thread()) { + // mi_assert_internal(_mi_heap_main.thread_id != 0); // can happen on freeBSD where alloc is called before any initialization + // the main heap is statically allocated + mi_heap_main_init(); + _mi_heap_set_default_direct(&_mi_heap_main); + //mi_assert_internal(_mi_heap_default->tld->heap_backing == mi_get_default_heap()); + } + else { + // use `_mi_os_alloc` to allocate directly from the OS + mi_thread_data_t* td = mi_thread_data_alloc(); + if (td == NULL) return false; + + // OS allocated so already zero initialized + mi_tld_t* tld = &td->tld; + mi_heap_t* heap = &td->heap; + _mi_memcpy_aligned(tld, &tld_empty, sizeof(*tld)); + _mi_memcpy_aligned(heap, &_mi_heap_empty, sizeof(*heap)); + heap->thread_id = _mi_thread_id(); + _mi_random_init(&heap->random); + heap->cookie = _mi_heap_random_next(heap) | 1; + heap->keys[0] = _mi_heap_random_next(heap); + heap->keys[1] = _mi_heap_random_next(heap); + heap->tld = tld; + tld->heap_backing = heap; + tld->heaps = heap; + tld->segments.stats = &tld->stats; + tld->segments.os = &tld->os; + tld->os.stats = &tld->stats; + _mi_heap_set_default_direct(heap); + } + return false; +} + +// Free the thread local default heap (called from `mi_thread_done`) +static bool _mi_heap_done(mi_heap_t* heap) { + if (!mi_heap_is_initialized(heap)) return true; + + // reset default heap + _mi_heap_set_default_direct(_mi_is_main_thread() ? &_mi_heap_main : (mi_heap_t*)&_mi_heap_empty); + + // switch to backing heap + heap = heap->tld->heap_backing; + if (!mi_heap_is_initialized(heap)) return false; + + // delete all non-backing heaps in this thread + mi_heap_t* curr = heap->tld->heaps; + while (curr != NULL) { + mi_heap_t* next = curr->next; // save `next` as `curr` will be freed + if (curr != heap) { + mi_assert_internal(!mi_heap_is_backing(curr)); + mi_heap_delete(curr); + } + curr = next; + } + mi_assert_internal(heap->tld->heaps == heap && heap->next == NULL); + mi_assert_internal(mi_heap_is_backing(heap)); + + // collect if not the main thread + if (heap != &_mi_heap_main) { + _mi_heap_collect_abandon(heap); + } + + // merge stats + _mi_stats_done(&heap->tld->stats); + + // free if not the main thread + if (heap != &_mi_heap_main) { + // the following assertion does not always hold for huge segments as those are always treated + // as abondened: one may allocate it in one thread, but deallocate in another in which case + // the count can be too large or negative. todo: perhaps not count huge segments? see issue #363 + // mi_assert_internal(heap->tld->segments.count == 0 || heap->thread_id != _mi_thread_id()); + mi_thread_data_free((mi_thread_data_t*)heap); + } + else { + mi_thread_data_collect(); // free cached thread metadata + #if 0 + // never free the main thread even in debug mode; if a dll is linked statically with mimalloc, + // there may still be delete/free calls after the mi_fls_done is called. Issue #207 + _mi_heap_destroy_pages(heap); + mi_assert_internal(heap->tld->heap_backing == &_mi_heap_main); + #endif + } + return false; +} + + + +// -------------------------------------------------------- +// Try to run `mi_thread_done()` automatically so any memory +// owned by the thread but not yet released can be abandoned +// and re-owned by another thread. +// +// 1. windows dynamic library: +// call from DllMain on DLL_THREAD_DETACH +// 2. windows static library: +// use `FlsAlloc` to call a destructor when the thread is done +// 3. unix, pthreads: +// use a pthread key to call a destructor when a pthread is done +// +// In the last two cases we also need to call `mi_process_init` +// to set up the thread local keys. +// -------------------------------------------------------- + +static void _mi_thread_done(mi_heap_t* default_heap); + +#if defined(_WIN32) && defined(MI_SHARED_LIB) + // nothing to do as it is done in DllMain +#elif defined(_WIN32) && !defined(MI_SHARED_LIB) + // use thread local storage keys to detect thread ending + #include + #include + #if (_WIN32_WINNT < 0x600) // before Windows Vista + WINBASEAPI DWORD WINAPI FlsAlloc( _In_opt_ PFLS_CALLBACK_FUNCTION lpCallback ); + WINBASEAPI PVOID WINAPI FlsGetValue( _In_ DWORD dwFlsIndex ); + WINBASEAPI BOOL WINAPI FlsSetValue( _In_ DWORD dwFlsIndex, _In_opt_ PVOID lpFlsData ); + WINBASEAPI BOOL WINAPI FlsFree(_In_ DWORD dwFlsIndex); + #endif + static DWORD mi_fls_key = (DWORD)(-1); + static void NTAPI mi_fls_done(PVOID value) { + if (value!=NULL) _mi_thread_done((mi_heap_t*)value); + } +#elif defined(MI_USE_PTHREADS) + // use pthread local storage keys to detect thread ending + // (and used with MI_TLS_PTHREADS for the default heap) + pthread_key_t _mi_heap_default_key = (pthread_key_t)(-1); + static void mi_pthread_done(void* value) { + if (value!=NULL) _mi_thread_done((mi_heap_t*)value); + } +#elif defined(__wasi__) +// no pthreads in the WebAssembly Standard Interface +#else + #pragma message("define a way to call mi_thread_done when a thread is done") +#endif + +// Set up handlers so `mi_thread_done` is called automatically +static void mi_process_setup_auto_thread_done(void) { + static bool tls_initialized = false; // fine if it races + if (tls_initialized) return; + tls_initialized = true; + #if defined(_WIN32) && defined(MI_SHARED_LIB) + // nothing to do as it is done in DllMain + #elif defined(_WIN32) && !defined(MI_SHARED_LIB) + mi_fls_key = FlsAlloc(&mi_fls_done); + #elif defined(MI_USE_PTHREADS) + mi_assert_internal(_mi_heap_default_key == (pthread_key_t)(-1)); + pthread_key_create(&_mi_heap_default_key, &mi_pthread_done); + #endif + _mi_heap_set_default_direct(&_mi_heap_main); +} + + +bool _mi_is_main_thread(void) { + return (_mi_heap_main.thread_id==0 || _mi_heap_main.thread_id == _mi_thread_id()); +} + +static _Atomic(size_t) thread_count = MI_ATOMIC_VAR_INIT(1); + +size_t _mi_current_thread_count(void) { + return mi_atomic_load_relaxed(&thread_count); +} + +// This is called from the `mi_malloc_generic` +void mi_thread_init(void) mi_attr_noexcept +{ + // ensure our process has started already + mi_process_init(); + + // initialize the thread local default heap + // (this will call `_mi_heap_set_default_direct` and thus set the + // fiber/pthread key to a non-zero value, ensuring `_mi_thread_done` is called) + if (_mi_heap_init()) return; // returns true if already initialized + + _mi_stat_increase(&_mi_stats_main.threads, 1); + mi_atomic_increment_relaxed(&thread_count); + //_mi_verbose_message("thread init: 0x%zx\n", _mi_thread_id()); +} + +void mi_thread_done(void) mi_attr_noexcept { + _mi_thread_done(mi_get_default_heap()); +} + +static void _mi_thread_done(mi_heap_t* heap) { + mi_atomic_decrement_relaxed(&thread_count); + _mi_stat_decrease(&_mi_stats_main.threads, 1); + + // check thread-id as on Windows shutdown with FLS the main (exit) thread may call this on thread-local heaps... + if (heap->thread_id != _mi_thread_id()) return; + + // abandon the thread local heap + if (_mi_heap_done(heap)) return; // returns true if already ran +} + +void _mi_heap_set_default_direct(mi_heap_t* heap) { + mi_assert_internal(heap != NULL); + #if defined(MI_TLS_SLOT) + mi_tls_slot_set(MI_TLS_SLOT,heap); + #elif defined(MI_TLS_PTHREAD_SLOT_OFS) + *mi_tls_pthread_heap_slot() = heap; + #elif defined(MI_TLS_PTHREAD) + // we use _mi_heap_default_key + #else + _mi_heap_default = heap; + #endif + + // ensure the default heap is passed to `_mi_thread_done` + // setting to a non-NULL value also ensures `mi_thread_done` is called. + #if defined(_WIN32) && defined(MI_SHARED_LIB) + // nothing to do as it is done in DllMain + #elif defined(_WIN32) && !defined(MI_SHARED_LIB) + mi_assert_internal(mi_fls_key != 0); + FlsSetValue(mi_fls_key, heap); + #elif defined(MI_USE_PTHREADS) + if (_mi_heap_default_key != (pthread_key_t)(-1)) { // can happen during recursive invocation on freeBSD + pthread_setspecific(_mi_heap_default_key, heap); + } + #endif +} + + +// -------------------------------------------------------- +// Run functions on process init/done, and thread init/done +// -------------------------------------------------------- +static void mi_process_done(void); + +static bool os_preloading = true; // true until this module is initialized +static bool mi_redirected = false; // true if malloc redirects to mi_malloc + +// Returns true if this module has not been initialized; Don't use C runtime routines until it returns false. +bool _mi_preloading(void) { + return os_preloading; +} + +mi_decl_nodiscard bool mi_is_redirected(void) mi_attr_noexcept { + return mi_redirected; +} + +// Communicate with the redirection module on Windows +#if defined(_WIN32) && defined(MI_SHARED_LIB) +#ifdef __cplusplus +extern "C" { +#endif +mi_decl_export void _mi_redirect_entry(DWORD reason) { + // called on redirection; careful as this may be called before DllMain + if (reason == DLL_PROCESS_ATTACH) { + mi_redirected = true; + } + else if (reason == DLL_PROCESS_DETACH) { + mi_redirected = false; + } + else if (reason == DLL_THREAD_DETACH) { + mi_thread_done(); + } +} +__declspec(dllimport) bool mi_allocator_init(const char** message); +__declspec(dllimport) void mi_allocator_done(void); +#ifdef __cplusplus +} +#endif +#else +static bool mi_allocator_init(const char** message) { + if (message != NULL) *message = NULL; + return true; +} +static void mi_allocator_done(void) { + // nothing to do +} +#endif + +// Called once by the process loader +static void mi_process_load(void) { + mi_heap_main_init(); + #if defined(MI_TLS_RECURSE_GUARD) + volatile mi_heap_t* dummy = _mi_heap_default; // access TLS to allocate it before setting tls_initialized to true; + MI_UNUSED(dummy); + #endif + os_preloading = false; + #if !(defined(_WIN32) && defined(MI_SHARED_LIB)) // use Dll process detach (see below) instead of atexit (issue #521) + atexit(&mi_process_done); + #endif + _mi_options_init(); + mi_process_init(); + //mi_stats_reset();- + if (mi_redirected) _mi_verbose_message("malloc is redirected.\n"); + + // show message from the redirector (if present) + const char* msg = NULL; + mi_allocator_init(&msg); + if (msg != NULL && (mi_option_is_enabled(mi_option_verbose) || mi_option_is_enabled(mi_option_show_errors))) { + _mi_fputs(NULL,NULL,NULL,msg); + } +} + +#if defined(_WIN32) && (defined(_M_IX86) || defined(_M_X64)) +#include +mi_decl_cache_align bool _mi_cpu_has_fsrm = false; + +static void mi_detect_cpu_features(void) { + // FSRM for fast rep movsb support (AMD Zen3+ (~2020) or Intel Ice Lake+ (~2017)) + int32_t cpu_info[4]; + __cpuid(cpu_info, 7); + _mi_cpu_has_fsrm = ((cpu_info[3] & (1 << 4)) != 0); // bit 4 of EDX : see +} +#else +static void mi_detect_cpu_features(void) { + // nothing +} +#endif + +// Initialize the process; called by thread_init or the process loader +void mi_process_init(void) mi_attr_noexcept { + // ensure we are called once + if (_mi_process_is_initialized) return; + _mi_verbose_message("process init: 0x%zx\n", _mi_thread_id()); + _mi_process_is_initialized = true; + mi_process_setup_auto_thread_done(); + + + mi_detect_cpu_features(); + _mi_os_init(); + mi_heap_main_init(); + #if (MI_DEBUG) + _mi_verbose_message("debug level : %d\n", MI_DEBUG); + #endif + _mi_verbose_message("secure level: %d\n", MI_SECURE); + mi_thread_init(); + + #if defined(_WIN32) && !defined(MI_SHARED_LIB) + // When building as a static lib the FLS cleanup happens to early for the main thread. + // To avoid this, set the FLS value for the main thread to NULL so the fls cleanup + // will not call _mi_thread_done on the (still executing) main thread. See issue #508. + FlsSetValue(mi_fls_key, NULL); + #endif + + mi_stats_reset(); // only call stat reset *after* thread init (or the heap tld == NULL) + + if (mi_option_is_enabled(mi_option_reserve_huge_os_pages)) { + size_t pages = mi_option_get_clamp(mi_option_reserve_huge_os_pages, 0, 128*1024); + long reserve_at = mi_option_get(mi_option_reserve_huge_os_pages_at); + if (reserve_at != -1) { + mi_reserve_huge_os_pages_at(pages, reserve_at, pages*500); + } else { + mi_reserve_huge_os_pages_interleave(pages, 0, pages*500); + } + } + if (mi_option_is_enabled(mi_option_reserve_os_memory)) { + long ksize = mi_option_get(mi_option_reserve_os_memory); + if (ksize > 0) { + mi_reserve_os_memory((size_t)ksize*MI_KiB, true /* commit? */, true /* allow large pages? */); + } + } +} + +// Called when the process is done (through `at_exit`) +static void mi_process_done(void) { + // only shutdown if we were initialized + if (!_mi_process_is_initialized) return; + // ensure we are called once + static bool process_done = false; + if (process_done) return; + process_done = true; + + #if defined(_WIN32) && !defined(MI_SHARED_LIB) + FlsFree(mi_fls_key); // call thread-done on all threads (except the main thread) to prevent dangling callback pointer if statically linked with a DLL; Issue #208 + #endif + + #ifndef MI_SKIP_COLLECT_ON_EXIT + #if (MI_DEBUG != 0) || !defined(MI_SHARED_LIB) + // free all memory if possible on process exit. This is not needed for a stand-alone process + // but should be done if mimalloc is statically linked into another shared library which + // is repeatedly loaded/unloaded, see issue #281. + mi_collect(true /* force */ ); + #endif + #endif + + if (mi_option_is_enabled(mi_option_show_stats) || mi_option_is_enabled(mi_option_verbose)) { + mi_stats_print(NULL); + } + mi_allocator_done(); + _mi_verbose_message("process done: 0x%zx\n", _mi_heap_main.thread_id); + os_preloading = true; // don't call the C runtime anymore +} + + + +#if defined(_WIN32) && defined(MI_SHARED_LIB) + // Windows DLL: easy to hook into process_init and thread_done + __declspec(dllexport) BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved) { + MI_UNUSED(reserved); + MI_UNUSED(inst); + if (reason==DLL_PROCESS_ATTACH) { + mi_process_load(); + } + else if (reason==DLL_PROCESS_DETACH) { + mi_process_done(); + } + else if (reason==DLL_THREAD_DETACH) { + if (!mi_is_redirected()) { + mi_thread_done(); + } + } + return TRUE; + } + +#elif defined(_MSC_VER) + // MSVC: use data section magic for static libraries + // See + static int _mi_process_init(void) { + mi_process_load(); + return 0; + } + typedef int(*_mi_crt_callback_t)(void); + #if defined(_M_X64) || defined(_M_ARM64) + __pragma(comment(linker, "/include:" "_mi_msvc_initu")) + #pragma section(".CRT$XIU", long, read) + #else + __pragma(comment(linker, "/include:" "__mi_msvc_initu")) + #endif + #pragma data_seg(".CRT$XIU") + mi_decl_externc _mi_crt_callback_t _mi_msvc_initu[] = { &_mi_process_init }; + #pragma data_seg() + +#elif defined(__cplusplus) + // C++: use static initialization to detect process start + static bool _mi_process_init(void) { + mi_process_load(); + return (_mi_heap_main.thread_id != 0); + } + static bool mi_initialized = _mi_process_init(); + +#elif defined(__GNUC__) || defined(__clang__) + // GCC,Clang: use the constructor attribute + static void __attribute__((constructor)) _mi_process_init(void) { + mi_process_load(); + } + +#else +#pragma message("define a way to call mi_process_load on your platform") +#endif diff --git a/compat/mimalloc/mimalloc-atomic.h b/compat/mimalloc/mimalloc-atomic.h new file mode 100644 index 00000000000000..c66f80493321ee --- /dev/null +++ b/compat/mimalloc/mimalloc-atomic.h @@ -0,0 +1,338 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2021 Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#pragma once +#ifndef MIMALLOC_ATOMIC_H +#define MIMALLOC_ATOMIC_H + +// -------------------------------------------------------------------------------------------- +// Atomics +// We need to be portable between C, C++, and MSVC. +// We base the primitives on the C/C++ atomics and create a mimimal wrapper for MSVC in C compilation mode. +// This is why we try to use only `uintptr_t` and `*` as atomic types. +// To gain better insight in the range of used atomics, we use explicitly named memory order operations +// instead of passing the memory order as a parameter. +// ----------------------------------------------------------------------------------------------- + +#if defined(__cplusplus) +// Use C++ atomics +#include +#define _Atomic(tp) std::atomic +#define mi_atomic(name) std::atomic_##name +#define mi_memory_order(name) std::memory_order_##name +#if !defined(ATOMIC_VAR_INIT) || (__cplusplus >= 202002L) // c++20, see issue #571 + #define MI_ATOMIC_VAR_INIT(x) x +#else + #define MI_ATOMIC_VAR_INIT(x) ATOMIC_VAR_INIT(x) +#endif +#elif defined(_MSC_VER) +// Use MSVC C wrapper for C11 atomics +#define _Atomic(tp) tp +#define MI_ATOMIC_VAR_INIT(x) x +#define mi_atomic(name) mi_atomic_##name +#define mi_memory_order(name) mi_memory_order_##name +#else +// Use C11 atomics +#include +#define mi_atomic(name) atomic_##name +#define mi_memory_order(name) memory_order_##name +#define MI_ATOMIC_VAR_INIT(x) ATOMIC_VAR_INIT(x) +#endif + +// Various defines for all used memory orders in mimalloc +#define mi_atomic_cas_weak(p,expected,desired,mem_success,mem_fail) \ + mi_atomic(compare_exchange_weak_explicit)(p,expected,desired,mem_success,mem_fail) + +#define mi_atomic_cas_strong(p,expected,desired,mem_success,mem_fail) \ + mi_atomic(compare_exchange_strong_explicit)(p,expected,desired,mem_success,mem_fail) + +#define mi_atomic_load_acquire(p) mi_atomic(load_explicit)(p,mi_memory_order(acquire)) +#define mi_atomic_load_relaxed(p) mi_atomic(load_explicit)(p,mi_memory_order(relaxed)) +#define mi_atomic_store_release(p,x) mi_atomic(store_explicit)(p,x,mi_memory_order(release)) +#define mi_atomic_store_relaxed(p,x) mi_atomic(store_explicit)(p,x,mi_memory_order(relaxed)) +#define mi_atomic_exchange_release(p,x) mi_atomic(exchange_explicit)(p,x,mi_memory_order(release)) +#define mi_atomic_exchange_acq_rel(p,x) mi_atomic(exchange_explicit)(p,x,mi_memory_order(acq_rel)) +#define mi_atomic_cas_weak_release(p,exp,des) mi_atomic_cas_weak(p,exp,des,mi_memory_order(release),mi_memory_order(relaxed)) +#define mi_atomic_cas_weak_acq_rel(p,exp,des) mi_atomic_cas_weak(p,exp,des,mi_memory_order(acq_rel),mi_memory_order(acquire)) +#define mi_atomic_cas_strong_release(p,exp,des) mi_atomic_cas_strong(p,exp,des,mi_memory_order(release),mi_memory_order(relaxed)) +#define mi_atomic_cas_strong_acq_rel(p,exp,des) mi_atomic_cas_strong(p,exp,des,mi_memory_order(acq_rel),mi_memory_order(acquire)) + +#define mi_atomic_add_relaxed(p,x) mi_atomic(fetch_add_explicit)(p,x,mi_memory_order(relaxed)) +#define mi_atomic_sub_relaxed(p,x) mi_atomic(fetch_sub_explicit)(p,x,mi_memory_order(relaxed)) +#define mi_atomic_add_acq_rel(p,x) mi_atomic(fetch_add_explicit)(p,x,mi_memory_order(acq_rel)) +#define mi_atomic_sub_acq_rel(p,x) mi_atomic(fetch_sub_explicit)(p,x,mi_memory_order(acq_rel)) +#define mi_atomic_and_acq_rel(p,x) mi_atomic(fetch_and_explicit)(p,x,mi_memory_order(acq_rel)) +#define mi_atomic_or_acq_rel(p,x) mi_atomic(fetch_or_explicit)(p,x,mi_memory_order(acq_rel)) + +#define mi_atomic_increment_relaxed(p) mi_atomic_add_relaxed(p,(uintptr_t)1) +#define mi_atomic_decrement_relaxed(p) mi_atomic_sub_relaxed(p,(uintptr_t)1) +#define mi_atomic_increment_acq_rel(p) mi_atomic_add_acq_rel(p,(uintptr_t)1) +#define mi_atomic_decrement_acq_rel(p) mi_atomic_sub_acq_rel(p,(uintptr_t)1) + +static inline void mi_atomic_yield(void); +static inline intptr_t mi_atomic_addi(_Atomic(intptr_t)*p, intptr_t add); +static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub); + + +#if defined(__cplusplus) || !defined(_MSC_VER) + +// In C++/C11 atomics we have polymorphic atomics so can use the typed `ptr` variants (where `tp` is the type of atomic value) +// We use these macros so we can provide a typed wrapper in MSVC in C compilation mode as well +#define mi_atomic_load_ptr_acquire(tp,p) mi_atomic_load_acquire(p) +#define mi_atomic_load_ptr_relaxed(tp,p) mi_atomic_load_relaxed(p) + +// In C++ we need to add casts to help resolve templates if NULL is passed +#if defined(__cplusplus) +#define mi_atomic_store_ptr_release(tp,p,x) mi_atomic_store_release(p,(tp*)x) +#define mi_atomic_store_ptr_relaxed(tp,p,x) mi_atomic_store_relaxed(p,(tp*)x) +#define mi_atomic_cas_ptr_weak_release(tp,p,exp,des) mi_atomic_cas_weak_release(p,exp,(tp*)des) +#define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des) mi_atomic_cas_weak_acq_rel(p,exp,(tp*)des) +#define mi_atomic_cas_ptr_strong_release(tp,p,exp,des) mi_atomic_cas_strong_release(p,exp,(tp*)des) +#define mi_atomic_exchange_ptr_release(tp,p,x) mi_atomic_exchange_release(p,(tp*)x) +#define mi_atomic_exchange_ptr_acq_rel(tp,p,x) mi_atomic_exchange_acq_rel(p,(tp*)x) +#else +#define mi_atomic_store_ptr_release(tp,p,x) mi_atomic_store_release(p,x) +#define mi_atomic_store_ptr_relaxed(tp,p,x) mi_atomic_store_relaxed(p,x) +#define mi_atomic_cas_ptr_weak_release(tp,p,exp,des) mi_atomic_cas_weak_release(p,exp,des) +#define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des) mi_atomic_cas_weak_acq_rel(p,exp,des) +#define mi_atomic_cas_ptr_strong_release(tp,p,exp,des) mi_atomic_cas_strong_release(p,exp,des) +#define mi_atomic_exchange_ptr_release(tp,p,x) mi_atomic_exchange_release(p,x) +#define mi_atomic_exchange_ptr_acq_rel(tp,p,x) mi_atomic_exchange_acq_rel(p,x) +#endif + +// These are used by the statistics +static inline int64_t mi_atomic_addi64_relaxed(volatile int64_t* p, int64_t add) { + return mi_atomic(fetch_add_explicit)((_Atomic(int64_t)*)p, add, mi_memory_order(relaxed)); +} +static inline void mi_atomic_maxi64_relaxed(volatile int64_t* p, int64_t x) { + int64_t current = mi_atomic_load_relaxed((_Atomic(int64_t)*)p); + while (current < x && !mi_atomic_cas_weak_release((_Atomic(int64_t)*)p, ¤t, x)) { /* nothing */ }; +} + +// Used by timers +#define mi_atomic_loadi64_acquire(p) mi_atomic(load_explicit)(p,mi_memory_order(acquire)) +#define mi_atomic_loadi64_relaxed(p) mi_atomic(load_explicit)(p,mi_memory_order(relaxed)) +#define mi_atomic_storei64_release(p,x) mi_atomic(store_explicit)(p,x,mi_memory_order(release)) +#define mi_atomic_storei64_relaxed(p,x) mi_atomic(store_explicit)(p,x,mi_memory_order(relaxed)) + + + +#elif defined(_MSC_VER) + +// MSVC C compilation wrapper that uses Interlocked operations to model C11 atomics. +#define WIN32_LEAN_AND_MEAN +#include +#include +#ifdef _WIN64 +typedef LONG64 msc_intptr_t; +#define MI_64(f) f##64 +#else +typedef LONG msc_intptr_t; +#define MI_64(f) f +#endif + +typedef enum mi_memory_order_e { + mi_memory_order_relaxed, + mi_memory_order_consume, + mi_memory_order_acquire, + mi_memory_order_release, + mi_memory_order_acq_rel, + mi_memory_order_seq_cst +} mi_memory_order; + +static inline uintptr_t mi_atomic_fetch_add_explicit(_Atomic(uintptr_t)*p, uintptr_t add, mi_memory_order mo) { + (void)(mo); + return (uintptr_t)MI_64(_InterlockedExchangeAdd)((volatile msc_intptr_t*)p, (msc_intptr_t)add); +} +static inline uintptr_t mi_atomic_fetch_sub_explicit(_Atomic(uintptr_t)*p, uintptr_t sub, mi_memory_order mo) { + (void)(mo); + return (uintptr_t)MI_64(_InterlockedExchangeAdd)((volatile msc_intptr_t*)p, -((msc_intptr_t)sub)); +} +static inline uintptr_t mi_atomic_fetch_and_explicit(_Atomic(uintptr_t)*p, uintptr_t x, mi_memory_order mo) { + (void)(mo); + return (uintptr_t)MI_64(_InterlockedAnd)((volatile msc_intptr_t*)p, (msc_intptr_t)x); +} +static inline uintptr_t mi_atomic_fetch_or_explicit(_Atomic(uintptr_t)*p, uintptr_t x, mi_memory_order mo) { + (void)(mo); + return (uintptr_t)MI_64(_InterlockedOr)((volatile msc_intptr_t*)p, (msc_intptr_t)x); +} +static inline bool mi_atomic_compare_exchange_strong_explicit(_Atomic(uintptr_t)*p, uintptr_t* expected, uintptr_t desired, mi_memory_order mo1, mi_memory_order mo2) { + (void)(mo1); (void)(mo2); + uintptr_t read = (uintptr_t)MI_64(_InterlockedCompareExchange)((volatile msc_intptr_t*)p, (msc_intptr_t)desired, (msc_intptr_t)(*expected)); + if (read == *expected) { + return true; + } + else { + *expected = read; + return false; + } +} +static inline bool mi_atomic_compare_exchange_weak_explicit(_Atomic(uintptr_t)*p, uintptr_t* expected, uintptr_t desired, mi_memory_order mo1, mi_memory_order mo2) { + return mi_atomic_compare_exchange_strong_explicit(p, expected, desired, mo1, mo2); +} +static inline uintptr_t mi_atomic_exchange_explicit(_Atomic(uintptr_t)*p, uintptr_t exchange, mi_memory_order mo) { + (void)(mo); + return (uintptr_t)MI_64(_InterlockedExchange)((volatile msc_intptr_t*)p, (msc_intptr_t)exchange); +} +static inline void mi_atomic_thread_fence(mi_memory_order mo) { + (void)(mo); + _Atomic(uintptr_t) x = 0; + mi_atomic_exchange_explicit(&x, 1, mo); +} +static inline uintptr_t mi_atomic_load_explicit(_Atomic(uintptr_t) const* p, mi_memory_order mo) { + (void)(mo); +#if defined(_M_IX86) || defined(_M_X64) + return *p; +#else + uintptr_t x = *p; + if (mo > mi_memory_order_relaxed) { + while (!mi_atomic_compare_exchange_weak_explicit(p, &x, x, mo, mi_memory_order_relaxed)) { /* nothing */ }; + } + return x; +#endif +} +static inline void mi_atomic_store_explicit(_Atomic(uintptr_t)*p, uintptr_t x, mi_memory_order mo) { + (void)(mo); +#if defined(_M_IX86) || defined(_M_X64) + *p = x; +#else + mi_atomic_exchange_explicit(p, x, mo); +#endif +} +static inline int64_t mi_atomic_loadi64_explicit(_Atomic(int64_t)*p, mi_memory_order mo) { + (void)(mo); +#if defined(_M_X64) + return *p; +#else + int64_t old = *p; + int64_t x = old; + while ((old = InterlockedCompareExchange64(p, x, old)) != x) { + x = old; + } + return x; +#endif +} +static inline void mi_atomic_storei64_explicit(_Atomic(int64_t)*p, int64_t x, mi_memory_order mo) { + (void)(mo); +#if defined(x_M_IX86) || defined(_M_X64) + *p = x; +#else + InterlockedExchange64(p, x); +#endif +} + +// These are used by the statistics +static inline int64_t mi_atomic_addi64_relaxed(volatile _Atomic(int64_t)*p, int64_t add) { +#ifdef _WIN64 + return (int64_t)mi_atomic_addi((int64_t*)p, add); +#else + int64_t current; + int64_t sum; + do { + current = *p; + sum = current + add; + } while (_InterlockedCompareExchange64(p, sum, current) != current); + return current; +#endif +} +static inline void mi_atomic_maxi64_relaxed(volatile _Atomic(int64_t)*p, int64_t x) { + int64_t current; + do { + current = *p; + } while (current < x && _InterlockedCompareExchange64(p, x, current) != current); +} + +// The pointer macros cast to `uintptr_t`. +#define mi_atomic_load_ptr_acquire(tp,p) (tp*)mi_atomic_load_acquire((_Atomic(uintptr_t)*)(p)) +#define mi_atomic_load_ptr_relaxed(tp,p) (tp*)mi_atomic_load_relaxed((_Atomic(uintptr_t)*)(p)) +#define mi_atomic_store_ptr_release(tp,p,x) mi_atomic_store_release((_Atomic(uintptr_t)*)(p),(uintptr_t)(x)) +#define mi_atomic_store_ptr_relaxed(tp,p,x) mi_atomic_store_relaxed((_Atomic(uintptr_t)*)(p),(uintptr_t)(x)) +#define mi_atomic_cas_ptr_weak_release(tp,p,exp,des) mi_atomic_cas_weak_release((_Atomic(uintptr_t)*)(p),(uintptr_t*)exp,(uintptr_t)des) +#define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des) mi_atomic_cas_weak_acq_rel((_Atomic(uintptr_t)*)(p),(uintptr_t*)exp,(uintptr_t)des) +#define mi_atomic_cas_ptr_strong_release(tp,p,exp,des) mi_atomic_cas_strong_release((_Atomic(uintptr_t)*)(p),(uintptr_t*)exp,(uintptr_t)des) +#define mi_atomic_exchange_ptr_release(tp,p,x) (tp*)mi_atomic_exchange_release((_Atomic(uintptr_t)*)(p),(uintptr_t)x) +#define mi_atomic_exchange_ptr_acq_rel(tp,p,x) (tp*)mi_atomic_exchange_acq_rel((_Atomic(uintptr_t)*)(p),(uintptr_t)x) + +#define mi_atomic_loadi64_acquire(p) mi_atomic(loadi64_explicit)(p,mi_memory_order(acquire)) +#define mi_atomic_loadi64_relaxed(p) mi_atomic(loadi64_explicit)(p,mi_memory_order(relaxed)) +#define mi_atomic_storei64_release(p,x) mi_atomic(storei64_explicit)(p,x,mi_memory_order(release)) +#define mi_atomic_storei64_relaxed(p,x) mi_atomic(storei64_explicit)(p,x,mi_memory_order(relaxed)) + + +#endif + + +// Atomically add a signed value; returns the previous value. +static inline intptr_t mi_atomic_addi(_Atomic(intptr_t)*p, intptr_t add) { + return (intptr_t)mi_atomic_add_acq_rel((_Atomic(uintptr_t)*)p, (uintptr_t)add); +} + +// Atomically subtract a signed value; returns the previous value. +static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub) { + return (intptr_t)mi_atomic_addi(p, -sub); +} + +// Yield +#if defined(__cplusplus) +#include +static inline void mi_atomic_yield(void) { + std::this_thread::yield(); +} +#elif defined(_WIN32) +#define WIN32_LEAN_AND_MEAN +#include +static inline void mi_atomic_yield(void) { + YieldProcessor(); +} +#elif defined(__SSE2__) +#include +static inline void mi_atomic_yield(void) { + _mm_pause(); +} +#elif (defined(__GNUC__) || defined(__clang__)) && \ + (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__armel__) || defined(__ARMEL__) || \ + defined(__aarch64__) || defined(__powerpc__) || defined(__ppc__) || defined(__PPC__)) +#if defined(__x86_64__) || defined(__i386__) +static inline void mi_atomic_yield(void) { + __asm__ volatile ("pause" ::: "memory"); +} +#elif defined(__aarch64__) +static inline void mi_atomic_yield(void) { + __asm__ volatile("wfe"); +} +#elif (defined(__arm__) && __ARM_ARCH__ >= 7) +static inline void mi_atomic_yield(void) { + __asm__ volatile("yield" ::: "memory"); +} +#elif defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) +static inline void mi_atomic_yield(void) { + __asm__ __volatile__ ("or 27,27,27" ::: "memory"); +} +#elif defined(__armel__) || defined(__ARMEL__) +static inline void mi_atomic_yield(void) { + __asm__ volatile ("nop" ::: "memory"); +} +#endif +#elif defined(__sun) +// Fallback for other archs +#include +static inline void mi_atomic_yield(void) { + smt_pause(); +} +#elif defined(__wasi__) +#include +static inline void mi_atomic_yield(void) { + sched_yield(); +} +#else +#include +static inline void mi_atomic_yield(void) { + sleep(0); +} +#endif + + +#endif // __MIMALLOC_ATOMIC_H diff --git a/compat/mimalloc/mimalloc-internal.h b/compat/mimalloc/mimalloc-internal.h new file mode 100644 index 00000000000000..de5c53b1e52f93 --- /dev/null +++ b/compat/mimalloc/mimalloc-internal.h @@ -0,0 +1,1049 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2022, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#pragma once +#ifndef MIMALLOC_INTERNAL_H +#define MIMALLOC_INTERNAL_H + +#include "mimalloc-types.h" + +#if (MI_DEBUG>0) +#define mi_trace_message(...) _mi_trace_message(__VA_ARGS__) +#else +#define mi_trace_message(...) +#endif + +#define MI_CACHE_LINE 64 +#if defined(_MSC_VER) +#pragma warning(disable:4127) // suppress constant conditional warning (due to MI_SECURE paths) +#pragma warning(disable:26812) // unscoped enum warning +#define mi_decl_noinline __declspec(noinline) +#define mi_decl_thread __declspec(thread) +#define mi_decl_cache_align __declspec(align(MI_CACHE_LINE)) +#elif (defined(__GNUC__) && (__GNUC__ >= 3)) || defined(__clang__) // includes clang and icc +#define mi_decl_noinline __attribute__((noinline)) +#define mi_decl_thread __thread +#define mi_decl_cache_align __attribute__((aligned(MI_CACHE_LINE))) +#else +#define mi_decl_noinline +#define mi_decl_thread __thread // hope for the best :-) +#define mi_decl_cache_align +#endif + +#if defined(__EMSCRIPTEN__) && !defined(__wasi__) +#define __wasi__ +#endif + +#if defined(__cplusplus) +#define mi_decl_externc extern "C" +#else +#define mi_decl_externc +#endif + +#if !defined(_WIN32) && !defined(__wasi__) +#define MI_USE_PTHREADS +#include +#endif + +// "options.c" +void _mi_fputs(mi_output_fun* out, void* arg, const char* prefix, const char* message); +void _mi_fprintf(mi_output_fun* out, void* arg, const char* fmt, ...); +void _mi_warning_message(const char* fmt, ...); +void _mi_verbose_message(const char* fmt, ...); +void _mi_trace_message(const char* fmt, ...); +void _mi_options_init(void); +void _mi_error_message(int err, const char* fmt, ...); + +// random.c +void _mi_random_init(mi_random_ctx_t* ctx); +void _mi_random_split(mi_random_ctx_t* ctx, mi_random_ctx_t* new_ctx); +uintptr_t _mi_random_next(mi_random_ctx_t* ctx); +uintptr_t _mi_heap_random_next(mi_heap_t* heap); +uintptr_t _mi_os_random_weak(uintptr_t extra_seed); +static inline uintptr_t _mi_random_shuffle(uintptr_t x); + +// init.c +extern mi_decl_cache_align mi_stats_t _mi_stats_main; +extern mi_decl_cache_align const mi_page_t _mi_page_empty; +bool _mi_is_main_thread(void); +size_t _mi_current_thread_count(void); +bool _mi_preloading(void); // true while the C runtime is not ready + +// os.c +size_t _mi_os_page_size(void); +void _mi_os_init(void); // called from process init +void* _mi_os_alloc(size_t size, mi_stats_t* stats); // to allocate thread local data +void _mi_os_free(void* p, size_t size, mi_stats_t* stats); // to free thread local data + +bool _mi_os_protect(void* addr, size_t size); +bool _mi_os_unprotect(void* addr, size_t size); +bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* stats); +bool _mi_os_decommit(void* p, size_t size, mi_stats_t* stats); +bool _mi_os_reset(void* p, size_t size, mi_stats_t* stats); +// bool _mi_os_unreset(void* p, size_t size, bool* is_zero, mi_stats_t* stats); +size_t _mi_os_good_alloc_size(size_t size); +bool _mi_os_has_overcommit(void); + +// arena.c +void* _mi_arena_alloc_aligned(size_t size, size_t alignment, bool* commit, bool* large, bool* is_pinned, bool* is_zero, size_t* memid, mi_os_tld_t* tld); +void* _mi_arena_alloc(size_t size, bool* commit, bool* large, bool* is_pinned, bool* is_zero, size_t* memid, mi_os_tld_t* tld); +void _mi_arena_free(void* p, size_t size, size_t memid, bool is_committed, mi_os_tld_t* tld); + +// "segment-cache.c" +void* _mi_segment_cache_pop(size_t size, mi_commit_mask_t* commit_mask, mi_commit_mask_t* decommit_mask, bool* large, bool* is_pinned, bool* is_zero, size_t* memid, mi_os_tld_t* tld); +bool _mi_segment_cache_push(void* start, size_t size, size_t memid, const mi_commit_mask_t* commit_mask, const mi_commit_mask_t* decommit_mask, bool is_large, bool is_pinned, mi_os_tld_t* tld); +void _mi_segment_cache_collect(bool force, mi_os_tld_t* tld); +void _mi_segment_map_allocated_at(const mi_segment_t* segment); +void _mi_segment_map_freed_at(const mi_segment_t* segment); + +// "segment.c" +mi_page_t* _mi_segment_page_alloc(mi_heap_t* heap, size_t block_wsize, mi_segments_tld_t* tld, mi_os_tld_t* os_tld); +void _mi_segment_page_free(mi_page_t* page, bool force, mi_segments_tld_t* tld); +void _mi_segment_page_abandon(mi_page_t* page, mi_segments_tld_t* tld); +bool _mi_segment_try_reclaim_abandoned( mi_heap_t* heap, bool try_all, mi_segments_tld_t* tld); +void _mi_segment_thread_collect(mi_segments_tld_t* tld); +void _mi_segment_huge_page_free(mi_segment_t* segment, mi_page_t* page, mi_block_t* block); + +uint8_t* _mi_segment_page_start(const mi_segment_t* segment, const mi_page_t* page, size_t* page_size); // page start for any page +void _mi_abandoned_reclaim_all(mi_heap_t* heap, mi_segments_tld_t* tld); +void _mi_abandoned_await_readers(void); +void _mi_abandoned_collect(mi_heap_t* heap, bool force, mi_segments_tld_t* tld); + + + +// "page.c" +void* _mi_malloc_generic(mi_heap_t* heap, size_t size) mi_attr_noexcept mi_attr_malloc; + +void _mi_page_retire(mi_page_t* page) mi_attr_noexcept; // free the page if there are no other pages with many free blocks +void _mi_page_unfull(mi_page_t* page); +void _mi_page_free(mi_page_t* page, mi_page_queue_t* pq, bool force); // free the page +void _mi_page_abandon(mi_page_t* page, mi_page_queue_t* pq); // abandon the page, to be picked up by another thread... +void _mi_heap_delayed_free(mi_heap_t* heap); +void _mi_heap_collect_retired(mi_heap_t* heap, bool force); + +void _mi_page_use_delayed_free(mi_page_t* page, mi_delayed_t delay, bool override_never); +size_t _mi_page_queue_append(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_queue_t* append); +void _mi_deferred_free(mi_heap_t* heap, bool force); + +void _mi_page_free_collect(mi_page_t* page,bool force); +void _mi_page_reclaim(mi_heap_t* heap, mi_page_t* page); // callback from segments + +size_t _mi_bin_size(uint8_t bin); // for stats +uint8_t _mi_bin(size_t size); // for stats + +// "heap.c" +void _mi_heap_destroy_pages(mi_heap_t* heap); +void _mi_heap_collect_abandon(mi_heap_t* heap); +void _mi_heap_set_default_direct(mi_heap_t* heap); + +// "stats.c" +void _mi_stats_done(mi_stats_t* stats); + +mi_msecs_t _mi_clock_now(void); +mi_msecs_t _mi_clock_end(mi_msecs_t start); +mi_msecs_t _mi_clock_start(void); + +// "alloc.c" +void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t size) mi_attr_noexcept; // called from `_mi_malloc_generic` +void* _mi_heap_malloc_zero(mi_heap_t* heap, size_t size, bool zero) mi_attr_noexcept; +void* _mi_heap_realloc_zero(mi_heap_t* heap, void* p, size_t newsize, bool zero) mi_attr_noexcept; +mi_block_t* _mi_page_ptr_unalign(const mi_segment_t* segment, const mi_page_t* page, const void* p); +bool _mi_free_delayed_block(mi_block_t* block); +void _mi_block_zero_init(const mi_page_t* page, void* p, size_t size); + +#if MI_DEBUG>1 +bool _mi_page_is_valid(mi_page_t* page); +#endif + + +// ------------------------------------------------------ +// Branches +// ------------------------------------------------------ + +#if defined(__GNUC__) || defined(__clang__) +#define mi_unlikely(x) __builtin_expect(!!(x),false) +#define mi_likely(x) __builtin_expect(!!(x),true) +#else +#define mi_unlikely(x) (x) +#define mi_likely(x) (x) +#endif + +#ifndef __has_builtin +#define __has_builtin(x) 0 +#endif + + +/* ----------------------------------------------------------- + Error codes passed to `_mi_fatal_error` + All are recoverable but EFAULT is a serious error and aborts by default in secure mode. + For portability define undefined error codes using common Unix codes: + +----------------------------------------------------------- */ +#include +#ifndef EAGAIN // double free +#define EAGAIN (11) +#endif +#ifndef ENOMEM // out of memory +#define ENOMEM (12) +#endif +#ifndef EFAULT // corrupted free-list or meta-data +#define EFAULT (14) +#endif +#ifndef EINVAL // trying to free an invalid pointer +#define EINVAL (22) +#endif +#ifndef EOVERFLOW // count*size overflow +#define EOVERFLOW (75) +#endif + + +/* ----------------------------------------------------------- + Inlined definitions +----------------------------------------------------------- */ +#define MI_UNUSED(x) (void)(x) +#if (MI_DEBUG>0) +#define MI_UNUSED_RELEASE(x) +#else +#define MI_UNUSED_RELEASE(x) MI_UNUSED(x) +#endif + +#define MI_INIT4(x) x(),x(),x(),x() +#define MI_INIT8(x) MI_INIT4(x),MI_INIT4(x) +#define MI_INIT16(x) MI_INIT8(x),MI_INIT8(x) +#define MI_INIT32(x) MI_INIT16(x),MI_INIT16(x) +#define MI_INIT64(x) MI_INIT32(x),MI_INIT32(x) +#define MI_INIT128(x) MI_INIT64(x),MI_INIT64(x) +#define MI_INIT256(x) MI_INIT128(x),MI_INIT128(x) + + +// Is `x` a power of two? (0 is considered a power of two) +static inline bool _mi_is_power_of_two(uintptr_t x) { + return ((x & (x - 1)) == 0); +} + +// Align upwards +static inline uintptr_t _mi_align_up(uintptr_t sz, size_t alignment) { + mi_assert_internal(alignment != 0); + uintptr_t mask = alignment - 1; + if ((alignment & mask) == 0) { // power of two? + return ((sz + mask) & ~mask); + } + else { + return (((sz + mask)/alignment)*alignment); + } +} + +// Align downwards +static inline uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) { + mi_assert_internal(alignment != 0); + uintptr_t mask = alignment - 1; + if ((alignment & mask) == 0) { // power of two? + return (sz & ~mask); + } + else { + return ((sz / alignment) * alignment); + } +} + +// Divide upwards: `s <= _mi_divide_up(s,d)*d < s+d`. +static inline uintptr_t _mi_divide_up(uintptr_t size, size_t divider) { + mi_assert_internal(divider != 0); + return (divider == 0 ? size : ((size + divider - 1) / divider)); +} + +// Is memory zero initialized? +static inline bool mi_mem_is_zero(void* p, size_t size) { + for (size_t i = 0; i < size; i++) { + if (((uint8_t*)p)[i] != 0) return false; + } + return true; +} + + +// Align a byte size to a size in _machine words_, +// i.e. byte size == `wsize*sizeof(void*)`. +static inline size_t _mi_wsize_from_size(size_t size) { + mi_assert_internal(size <= SIZE_MAX - sizeof(uintptr_t)); + return (size + sizeof(uintptr_t) - 1) / sizeof(uintptr_t); +} + +// Overflow detecting multiply +#if __has_builtin(__builtin_umul_overflow) || (defined(__GNUC__) && (__GNUC__ >= 5)) +#include // UINT_MAX, ULONG_MAX +#if defined(_CLOCK_T) // for Illumos +#undef _CLOCK_T +#endif +static inline bool mi_mul_overflow(size_t count, size_t size, size_t* total) { + #if (SIZE_MAX == ULONG_MAX) + return __builtin_umull_overflow(count, size, (unsigned long *)total); + #elif (SIZE_MAX == UINT_MAX) + return __builtin_umul_overflow(count, size, (unsigned int *)total); + #else + return __builtin_umulll_overflow(count, size, (unsigned long long *)total); + #endif +} +#else /* __builtin_umul_overflow is unavailable */ +static inline bool mi_mul_overflow(size_t count, size_t size, size_t* total) { + #define MI_MUL_NO_OVERFLOW ((size_t)1 << (4*sizeof(size_t))) // sqrt(SIZE_MAX) + *total = count * size; + return ((size >= MI_MUL_NO_OVERFLOW || count >= MI_MUL_NO_OVERFLOW) + && size > 0 && (SIZE_MAX / size) < count); +} +#endif + +// Safe multiply `count*size` into `total`; return `true` on overflow. +static inline bool mi_count_size_overflow(size_t count, size_t size, size_t* total) { + if (count==1) { // quick check for the case where count is one (common for C++ allocators) + *total = size; + return false; + } + else if (mi_unlikely(mi_mul_overflow(count, size, total))) { + _mi_error_message(EOVERFLOW, "allocation request is too large (%zu * %zu bytes)\n", count, size); + *total = SIZE_MAX; + return true; + } + else return false; +} + + +/* ---------------------------------------------------------------------------------------- +The thread local default heap: `_mi_get_default_heap` returns the thread local heap. +On most platforms (Windows, Linux, FreeBSD, NetBSD, etc), this just returns a +__thread local variable (`_mi_heap_default`). With the initial-exec TLS model this ensures +that the storage will always be available (allocated on the thread stacks). +On some platforms though we cannot use that when overriding `malloc` since the underlying +TLS implementation (or the loader) will call itself `malloc` on a first access and recurse. +We try to circumvent this in an efficient way: +- macOSX : we use an unused TLS slot from the OS allocated slots (MI_TLS_SLOT). On OSX, the + loader itself calls `malloc` even before the modules are initialized. +- OpenBSD: we use an unused slot from the pthread block (MI_TLS_PTHREAD_SLOT_OFS). +- DragonFly: defaults are working but seem slow compared to freeBSD (see PR #323) +------------------------------------------------------------------------------------------- */ + +extern const mi_heap_t _mi_heap_empty; // read-only empty heap, initial value of the thread local default heap +extern bool _mi_process_is_initialized; +mi_heap_t* _mi_heap_main_get(void); // statically allocated main backing heap + +#if defined(MI_MALLOC_OVERRIDE) +#if defined(__APPLE__) // macOS +#define MI_TLS_SLOT 89 // seems unused? +// #define MI_TLS_RECURSE_GUARD 1 +// other possible unused ones are 9, 29, __PTK_FRAMEWORK_JAVASCRIPTCORE_KEY4 (94), __PTK_FRAMEWORK_GC_KEY9 (112) and __PTK_FRAMEWORK_OLDGC_KEY9 (89) +// see +#elif defined(__OpenBSD__) +// use end bytes of a name; goes wrong if anyone uses names > 23 characters (ptrhread specifies 16) +// see +#define MI_TLS_PTHREAD_SLOT_OFS (6*sizeof(int) + 4*sizeof(void*) + 24) +// #elif defined(__DragonFly__) +// #warning "mimalloc is not working correctly on DragonFly yet." +// #define MI_TLS_PTHREAD_SLOT_OFS (4 + 1*sizeof(void*)) // offset `uniqueid` (also used by gdb?) +#elif defined(__ANDROID__) +// See issue #381 +#define MI_TLS_PTHREAD +#endif +#endif + +#if defined(MI_TLS_SLOT) +static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept; // forward declaration +#elif defined(MI_TLS_PTHREAD_SLOT_OFS) +static inline mi_heap_t** mi_tls_pthread_heap_slot(void) { + pthread_t self = pthread_self(); + #if defined(__DragonFly__) + if (self==NULL) { + mi_heap_t* pheap_main = _mi_heap_main_get(); + return &pheap_main; + } + #endif + return (mi_heap_t**)((uint8_t*)self + MI_TLS_PTHREAD_SLOT_OFS); +} +#elif defined(MI_TLS_PTHREAD) +extern pthread_key_t _mi_heap_default_key; +#endif + +// Default heap to allocate from (if not using TLS- or pthread slots). +// Do not use this directly but use through `mi_heap_get_default()` (or the unchecked `mi_get_default_heap`). +// This thread local variable is only used when neither MI_TLS_SLOT, MI_TLS_PTHREAD, or MI_TLS_PTHREAD_SLOT_OFS are defined. +// However, on the Apple M1 we do use the address of this variable as the unique thread-id (issue #356). +extern mi_decl_thread mi_heap_t* _mi_heap_default; // default heap to allocate from + +static inline mi_heap_t* mi_get_default_heap(void) { +#if defined(MI_TLS_SLOT) + mi_heap_t* heap = (mi_heap_t*)mi_tls_slot(MI_TLS_SLOT); + if (mi_unlikely(heap == NULL)) { + #ifdef __GNUC__ + __asm(""); // prevent conditional load of the address of _mi_heap_empty + #endif + heap = (mi_heap_t*)&_mi_heap_empty; + } + return heap; +#elif defined(MI_TLS_PTHREAD_SLOT_OFS) + mi_heap_t* heap = *mi_tls_pthread_heap_slot(); + return (mi_unlikely(heap == NULL) ? (mi_heap_t*)&_mi_heap_empty : heap); +#elif defined(MI_TLS_PTHREAD) + mi_heap_t* heap = (mi_unlikely(_mi_heap_default_key == (pthread_key_t)(-1)) ? _mi_heap_main_get() : (mi_heap_t*)pthread_getspecific(_mi_heap_default_key)); + return (mi_unlikely(heap == NULL) ? (mi_heap_t*)&_mi_heap_empty : heap); +#else + #if defined(MI_TLS_RECURSE_GUARD) + if (mi_unlikely(!_mi_process_is_initialized)) return _mi_heap_main_get(); + #endif + return _mi_heap_default; +#endif +} + +static inline bool mi_heap_is_default(const mi_heap_t* heap) { + return (heap == mi_get_default_heap()); +} + +static inline bool mi_heap_is_backing(const mi_heap_t* heap) { + return (heap->tld->heap_backing == heap); +} + +static inline bool mi_heap_is_initialized(mi_heap_t* heap) { + mi_assert_internal(heap != NULL); + return (heap != &_mi_heap_empty); +} + +static inline uintptr_t _mi_ptr_cookie(const void* p) { + extern mi_heap_t _mi_heap_main; + mi_assert_internal(_mi_heap_main.cookie != 0); + return ((uintptr_t)p ^ _mi_heap_main.cookie); +} + +/* ----------------------------------------------------------- + Pages +----------------------------------------------------------- */ + +static inline mi_page_t* _mi_heap_get_free_small_page(mi_heap_t* heap, size_t size) { + mi_assert_internal(size <= (MI_SMALL_SIZE_MAX + MI_PADDING_SIZE)); + const size_t idx = _mi_wsize_from_size(size); + mi_assert_internal(idx < MI_PAGES_DIRECT); + return heap->pages_free_direct[idx]; +} + +// Get the page belonging to a certain size class +static inline mi_page_t* _mi_get_free_small_page(size_t size) { + return _mi_heap_get_free_small_page(mi_get_default_heap(), size); +} + +// Segment that contains the pointer +static inline mi_segment_t* _mi_ptr_segment(const void* p) { + // mi_assert_internal(p != NULL); + return (mi_segment_t*)((uintptr_t)p & ~MI_SEGMENT_MASK); +} + +static inline mi_page_t* mi_slice_to_page(mi_slice_t* s) { + mi_assert_internal(s->slice_offset== 0 && s->slice_count > 0); + return (mi_page_t*)(s); +} + +static inline mi_slice_t* mi_page_to_slice(mi_page_t* p) { + mi_assert_internal(p->slice_offset== 0 && p->slice_count > 0); + return (mi_slice_t*)(p); +} + +// Segment belonging to a page +static inline mi_segment_t* _mi_page_segment(const mi_page_t* page) { + mi_segment_t* segment = _mi_ptr_segment(page); + mi_assert_internal(segment == NULL || ((mi_slice_t*)page >= segment->slices && (mi_slice_t*)page < segment->slices + segment->slice_entries)); + return segment; +} + +static inline mi_slice_t* mi_slice_first(const mi_slice_t* slice) { + mi_slice_t* start = (mi_slice_t*)((uint8_t*)slice - slice->slice_offset); + mi_assert_internal(start >= _mi_ptr_segment(slice)->slices); + mi_assert_internal(start->slice_offset == 0); + mi_assert_internal(start + start->slice_count > slice); + return start; +} + +// Get the page containing the pointer +static inline mi_page_t* _mi_segment_page_of(const mi_segment_t* segment, const void* p) { + ptrdiff_t diff = (uint8_t*)p - (uint8_t*)segment; + mi_assert_internal(diff >= 0 && diff < (ptrdiff_t)MI_SEGMENT_SIZE); + size_t idx = (size_t)diff >> MI_SEGMENT_SLICE_SHIFT; + mi_assert_internal(idx < segment->slice_entries); + mi_slice_t* slice0 = (mi_slice_t*)&segment->slices[idx]; + mi_slice_t* slice = mi_slice_first(slice0); // adjust to the block that holds the page data + mi_assert_internal(slice->slice_offset == 0); + mi_assert_internal(slice >= segment->slices && slice < segment->slices + segment->slice_entries); + return mi_slice_to_page(slice); +} + +// Quick page start for initialized pages +static inline uint8_t* _mi_page_start(const mi_segment_t* segment, const mi_page_t* page, size_t* page_size) { + return _mi_segment_page_start(segment, page, page_size); +} + +// Get the page containing the pointer +static inline mi_page_t* _mi_ptr_page(void* p) { + return _mi_segment_page_of(_mi_ptr_segment(p), p); +} + +// Get the block size of a page (special case for huge objects) +static inline size_t mi_page_block_size(const mi_page_t* page) { + const size_t bsize = page->xblock_size; + mi_assert_internal(bsize > 0); + if (mi_likely(bsize < MI_HUGE_BLOCK_SIZE)) { + return bsize; + } + else { + size_t psize; + _mi_segment_page_start(_mi_page_segment(page), page, &psize); + return psize; + } +} + +// Get the usable block size of a page without fixed padding. +// This may still include internal padding due to alignment and rounding up size classes. +static inline size_t mi_page_usable_block_size(const mi_page_t* page) { + return mi_page_block_size(page) - MI_PADDING_SIZE; +} + +// size of a segment +static inline size_t mi_segment_size(mi_segment_t* segment) { + return segment->segment_slices * MI_SEGMENT_SLICE_SIZE; +} + +static inline uint8_t* mi_segment_end(mi_segment_t* segment) { + return (uint8_t*)segment + mi_segment_size(segment); +} + +// Thread free access +static inline mi_block_t* mi_page_thread_free(const mi_page_t* page) { + return (mi_block_t*)(mi_atomic_load_relaxed(&((mi_page_t*)page)->xthread_free) & ~3); +} + +static inline mi_delayed_t mi_page_thread_free_flag(const mi_page_t* page) { + return (mi_delayed_t)(mi_atomic_load_relaxed(&((mi_page_t*)page)->xthread_free) & 3); +} + +// Heap access +static inline mi_heap_t* mi_page_heap(const mi_page_t* page) { + return (mi_heap_t*)(mi_atomic_load_relaxed(&((mi_page_t*)page)->xheap)); +} + +static inline void mi_page_set_heap(mi_page_t* page, mi_heap_t* heap) { + mi_assert_internal(mi_page_thread_free_flag(page) != MI_DELAYED_FREEING); + mi_atomic_store_release(&page->xheap,(uintptr_t)heap); +} + +// Thread free flag helpers +static inline mi_block_t* mi_tf_block(mi_thread_free_t tf) { + return (mi_block_t*)(tf & ~0x03); +} +static inline mi_delayed_t mi_tf_delayed(mi_thread_free_t tf) { + return (mi_delayed_t)(tf & 0x03); +} +static inline mi_thread_free_t mi_tf_make(mi_block_t* block, mi_delayed_t delayed) { + return (mi_thread_free_t)((uintptr_t)block | (uintptr_t)delayed); +} +static inline mi_thread_free_t mi_tf_set_delayed(mi_thread_free_t tf, mi_delayed_t delayed) { + return mi_tf_make(mi_tf_block(tf),delayed); +} +static inline mi_thread_free_t mi_tf_set_block(mi_thread_free_t tf, mi_block_t* block) { + return mi_tf_make(block, mi_tf_delayed(tf)); +} + +// are all blocks in a page freed? +// note: needs up-to-date used count, (as the `xthread_free` list may not be empty). see `_mi_page_collect_free`. +static inline bool mi_page_all_free(const mi_page_t* page) { + mi_assert_internal(page != NULL); + return (page->used == 0); +} + +// are there any available blocks? +static inline bool mi_page_has_any_available(const mi_page_t* page) { + mi_assert_internal(page != NULL && page->reserved > 0); + return (page->used < page->reserved || (mi_page_thread_free(page) != NULL)); +} + +// are there immediately available blocks, i.e. blocks available on the free list. +static inline bool mi_page_immediate_available(const mi_page_t* page) { + mi_assert_internal(page != NULL); + return (page->free != NULL); +} + +// is more than 7/8th of a page in use? +static inline bool mi_page_mostly_used(const mi_page_t* page) { + if (page==NULL) return true; + uint16_t frac = page->reserved / 8U; + return (page->reserved - page->used <= frac); +} + +static inline mi_page_queue_t* mi_page_queue(const mi_heap_t* heap, size_t size) { + return &((mi_heap_t*)heap)->pages[_mi_bin(size)]; +} + + + +//----------------------------------------------------------- +// Page flags +//----------------------------------------------------------- +static inline bool mi_page_is_in_full(const mi_page_t* page) { + return page->flags.x.in_full; +} + +static inline void mi_page_set_in_full(mi_page_t* page, bool in_full) { + page->flags.x.in_full = in_full; +} + +static inline bool mi_page_has_aligned(const mi_page_t* page) { + return page->flags.x.has_aligned; +} + +static inline void mi_page_set_has_aligned(mi_page_t* page, bool has_aligned) { + page->flags.x.has_aligned = has_aligned; +} + + +/* ------------------------------------------------------------------- +Encoding/Decoding the free list next pointers + +This is to protect against buffer overflow exploits where the +free list is mutated. Many hardened allocators xor the next pointer `p` +with a secret key `k1`, as `p^k1`. This prevents overwriting with known +values but might be still too weak: if the attacker can guess +the pointer `p` this can reveal `k1` (since `p^k1^p == k1`). +Moreover, if multiple blocks can be read as well, the attacker can +xor both as `(p1^k1) ^ (p2^k1) == p1^p2` which may reveal a lot +about the pointers (and subsequently `k1`). + +Instead mimalloc uses an extra key `k2` and encodes as `((p^k2)<<> (MI_INTPTR_BITS - shift)))); +} +static inline uintptr_t mi_rotr(uintptr_t x, uintptr_t shift) { + shift %= MI_INTPTR_BITS; + return (shift==0 ? x : ((x >> shift) | (x << (MI_INTPTR_BITS - shift)))); +} + +static inline void* mi_ptr_decode(const void* null, const mi_encoded_t x, const uintptr_t* keys) { + void* p = (void*)(mi_rotr(x - keys[0], keys[0]) ^ keys[1]); + return (mi_unlikely(p==null) ? NULL : p); +} + +static inline mi_encoded_t mi_ptr_encode(const void* null, const void* p, const uintptr_t* keys) { + uintptr_t x = (uintptr_t)(mi_unlikely(p==NULL) ? null : p); + return mi_rotl(x ^ keys[1], keys[0]) + keys[0]; +} + +static inline mi_block_t* mi_block_nextx( const void* null, const mi_block_t* block, const uintptr_t* keys ) { + #ifdef MI_ENCODE_FREELIST + return (mi_block_t*)mi_ptr_decode(null, block->next, keys); + #else + MI_UNUSED(keys); MI_UNUSED(null); + return (mi_block_t*)block->next; + #endif +} + +static inline void mi_block_set_nextx(const void* null, mi_block_t* block, const mi_block_t* next, const uintptr_t* keys) { + #ifdef MI_ENCODE_FREELIST + block->next = mi_ptr_encode(null, next, keys); + #else + MI_UNUSED(keys); MI_UNUSED(null); + block->next = (mi_encoded_t)next; + #endif +} + +static inline mi_block_t* mi_block_next(const mi_page_t* page, const mi_block_t* block) { + #ifdef MI_ENCODE_FREELIST + mi_block_t* next = mi_block_nextx(page,block,page->keys); + // check for free list corruption: is `next` at least in the same page? + // TODO: check if `next` is `page->block_size` aligned? + if (mi_unlikely(next!=NULL && !mi_is_in_same_page(block, next))) { + _mi_error_message(EFAULT, "corrupted free list entry of size %zub at %p: value 0x%zx\n", mi_page_block_size(page), block, (uintptr_t)next); + next = NULL; + } + return next; + #else + MI_UNUSED(page); + return mi_block_nextx(page,block,NULL); + #endif +} + +static inline void mi_block_set_next(const mi_page_t* page, mi_block_t* block, const mi_block_t* next) { + #ifdef MI_ENCODE_FREELIST + mi_block_set_nextx(page,block,next, page->keys); + #else + MI_UNUSED(page); + mi_block_set_nextx(page,block,next,NULL); + #endif +} + + +// ------------------------------------------------------------------- +// commit mask +// ------------------------------------------------------------------- + +static inline void mi_commit_mask_create_empty(mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + cm->mask[i] = 0; + } +} + +static inline void mi_commit_mask_create_full(mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + cm->mask[i] = ~((size_t)0); + } +} + +static inline bool mi_commit_mask_is_empty(const mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + if (cm->mask[i] != 0) return false; + } + return true; +} + +static inline bool mi_commit_mask_is_full(const mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + if (cm->mask[i] != ~((size_t)0)) return false; + } + return true; +} + +// defined in `segment.c`: +size_t _mi_commit_mask_committed_size(const mi_commit_mask_t* cm, size_t total); +size_t _mi_commit_mask_next_run(const mi_commit_mask_t* cm, size_t* idx); + +#define mi_commit_mask_foreach(cm,idx,count) \ + idx = 0; \ + while ((count = _mi_commit_mask_next_run(cm,&idx)) > 0) { + +#define mi_commit_mask_foreach_end() \ + idx += count; \ + } + + + + +// ------------------------------------------------------------------- +// Fast "random" shuffle +// ------------------------------------------------------------------- + +static inline uintptr_t _mi_random_shuffle(uintptr_t x) { + if (x==0) { x = 17; } // ensure we don't get stuck in generating zeros +#if (MI_INTPTR_SIZE==8) + // by Sebastiano Vigna, see: + x ^= x >> 30; + x *= 0xbf58476d1ce4e5b9UL; + x ^= x >> 27; + x *= 0x94d049bb133111ebUL; + x ^= x >> 31; +#elif (MI_INTPTR_SIZE==4) + // by Chris Wellons, see: + x ^= x >> 16; + x *= 0x7feb352dUL; + x ^= x >> 15; + x *= 0x846ca68bUL; + x ^= x >> 16; +#endif + return x; +} + +// ------------------------------------------------------------------- +// Optimize numa node access for the common case (= one node) +// ------------------------------------------------------------------- + +int _mi_os_numa_node_get(mi_os_tld_t* tld); +size_t _mi_os_numa_node_count_get(void); + +extern _Atomic(size_t) _mi_numa_node_count; +static inline int _mi_os_numa_node(mi_os_tld_t* tld) { + if (mi_likely(mi_atomic_load_relaxed(&_mi_numa_node_count) == 1)) return 0; + else return _mi_os_numa_node_get(tld); +} +static inline size_t _mi_os_numa_node_count(void) { + const size_t count = mi_atomic_load_relaxed(&_mi_numa_node_count); + if (mi_likely(count>0)) return count; + else return _mi_os_numa_node_count_get(); +} + + +// ------------------------------------------------------------------- +// Getting the thread id should be performant as it is called in the +// fast path of `_mi_free` and we specialize for various platforms. +// We only require _mi_threadid() to return a unique id for each thread. +// ------------------------------------------------------------------- +#if defined(_WIN32) + +#define WIN32_LEAN_AND_MEAN +#include +static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept { + // Windows: works on Intel and ARM in both 32- and 64-bit + return (uintptr_t)NtCurrentTeb(); +} + +// We use assembly for a fast thread id on the main platforms. The TLS layout depends on +// both the OS and libc implementation so we use specific tests for each main platform. +// If you test on another platform and it works please send a PR :-) +// see also https://akkadia.org/drepper/tls.pdf for more info on the TLS register. +#elif defined(__GNUC__) && ( \ + (defined(__GLIBC__) && (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))) \ + || (defined(__APPLE__) && (defined(__x86_64__) || defined(__aarch64__))) \ + || (defined(__BIONIC__) && (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))) \ + || (defined(__FreeBSD__) && (defined(__x86_64__) || defined(__i386__) || defined(__aarch64__))) \ + || (defined(__OpenBSD__) && (defined(__x86_64__) || defined(__i386__) || defined(__aarch64__))) \ + ) + +static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept { + void* res; + const size_t ofs = (slot*sizeof(void*)); + #if defined(__i386__) + __asm__("movl %%gs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x86 32-bit always uses GS + #elif defined(__APPLE__) && defined(__x86_64__) + __asm__("movq %%gs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x86_64 macOSX uses GS + #elif defined(__x86_64__) && (MI_INTPTR_SIZE==4) + __asm__("movl %%fs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x32 ABI + #elif defined(__x86_64__) + __asm__("movq %%fs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x86_64 Linux, BSD uses FS + #elif defined(__arm__) + void** tcb; MI_UNUSED(ofs); + __asm__ volatile ("mrc p15, 0, %0, c13, c0, 3\nbic %0, %0, #3" : "=r" (tcb)); + res = tcb[slot]; + #elif defined(__aarch64__) + void** tcb; MI_UNUSED(ofs); + #if defined(__APPLE__) // M1, issue #343 + __asm__ volatile ("mrs %0, tpidrro_el0\nbic %0, %0, #7" : "=r" (tcb)); + #else + __asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb)); + #endif + res = tcb[slot]; + #endif + return res; +} + +// setting a tls slot is only used on macOS for now +static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept { + const size_t ofs = (slot*sizeof(void*)); + #if defined(__i386__) + __asm__("movl %1,%%gs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // 32-bit always uses GS + #elif defined(__APPLE__) && defined(__x86_64__) + __asm__("movq %1,%%gs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // x86_64 macOS uses GS + #elif defined(__x86_64__) && (MI_INTPTR_SIZE==4) + __asm__("movl %1,%%fs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // x32 ABI + #elif defined(__x86_64__) + __asm__("movq %1,%%fs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // x86_64 Linux, BSD uses FS + #elif defined(__arm__) + void** tcb; MI_UNUSED(ofs); + __asm__ volatile ("mrc p15, 0, %0, c13, c0, 3\nbic %0, %0, #3" : "=r" (tcb)); + tcb[slot] = value; + #elif defined(__aarch64__) + void** tcb; MI_UNUSED(ofs); + #if defined(__APPLE__) // M1, issue #343 + __asm__ volatile ("mrs %0, tpidrro_el0\nbic %0, %0, #7" : "=r" (tcb)); + #else + __asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb)); + #endif + tcb[slot] = value; + #endif +} + +static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept { + #if defined(__BIONIC__) + // issue #384, #495: on the Bionic libc (Android), slot 1 is the thread id + // see: https://github.com/aosp-mirror/platform_bionic/blob/c44b1d0676ded732df4b3b21c5f798eacae93228/libc/platform/bionic/tls_defines.h#L86 + return (uintptr_t)mi_tls_slot(1); + #else + // in all our other targets, slot 0 is the thread id + // glibc: https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=sysdeps/x86_64/nptl/tls.h + // apple: https://github.com/apple/darwin-xnu/blob/main/libsyscall/os/tsd.h#L36 + return (uintptr_t)mi_tls_slot(0); + #endif +} + +#else + +// otherwise use portable C, taking the address of a thread local variable (this is still very fast on most platforms). +static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept { + return (uintptr_t)&_mi_heap_default; +} + +#endif + + +// ----------------------------------------------------------------------- +// Count bits: trailing or leading zeros (with MI_INTPTR_BITS on all zero) +// ----------------------------------------------------------------------- + +#if defined(__GNUC__) + +#include // LONG_MAX +#define MI_HAVE_FAST_BITSCAN +static inline size_t mi_clz(uintptr_t x) { + if (x==0) return MI_INTPTR_BITS; +#if (INTPTR_MAX == LONG_MAX) + return __builtin_clzl(x); +#else + return __builtin_clzll(x); +#endif +} +static inline size_t mi_ctz(uintptr_t x) { + if (x==0) return MI_INTPTR_BITS; +#if (INTPTR_MAX == LONG_MAX) + return __builtin_ctzl(x); +#else + return __builtin_ctzll(x); +#endif +} + +#elif defined(_MSC_VER) + +#include // LONG_MAX +#define MI_HAVE_FAST_BITSCAN +static inline size_t mi_clz(uintptr_t x) { + if (x==0) return MI_INTPTR_BITS; + unsigned long idx; +#if (INTPTR_MAX == LONG_MAX) + _BitScanReverse(&idx, x); +#else + _BitScanReverse64(&idx, x); +#endif + return ((MI_INTPTR_BITS - 1) - idx); +} +static inline size_t mi_ctz(uintptr_t x) { + if (x==0) return MI_INTPTR_BITS; + unsigned long idx; +#if (INTPTR_MAX == LONG_MAX) + _BitScanForward(&idx, x); +#else + _BitScanForward64(&idx, x); +#endif + return idx; +} + +#else +static inline size_t mi_ctz32(uint32_t x) { + // de Bruijn multiplication, see + static const unsigned char debruijn[32] = { + 0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8, + 31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9 + }; + if (x==0) return 32; + return debruijn[((x & -(int32_t)x) * 0x077CB531UL) >> 27]; +} +static inline size_t mi_clz32(uint32_t x) { + // de Bruijn multiplication, see + static const uint8_t debruijn[32] = { + 31, 22, 30, 21, 18, 10, 29, 2, 20, 17, 15, 13, 9, 6, 28, 1, + 23, 19, 11, 3, 16, 14, 7, 24, 12, 4, 8, 25, 5, 26, 27, 0 + }; + if (x==0) return 32; + x |= x >> 1; + x |= x >> 2; + x |= x >> 4; + x |= x >> 8; + x |= x >> 16; + return debruijn[(uint32_t)(x * 0x07C4ACDDUL) >> 27]; +} + +static inline size_t mi_clz(uintptr_t x) { + if (x==0) return MI_INTPTR_BITS; +#if (MI_INTPTR_BITS <= 32) + return mi_clz32((uint32_t)x); +#else + size_t count = mi_clz32((uint32_t)(x >> 32)); + if (count < 32) return count; + return (32 + mi_clz32((uint32_t)x)); +#endif +} +static inline size_t mi_ctz(uintptr_t x) { + if (x==0) return MI_INTPTR_BITS; +#if (MI_INTPTR_BITS <= 32) + return mi_ctz32((uint32_t)x); +#else + size_t count = mi_ctz32((uint32_t)x); + if (count < 32) return count; + return (32 + mi_ctz32((uint32_t)(x>>32))); +#endif +} + +#endif + +// "bit scan reverse": Return index of the highest bit (or MI_INTPTR_BITS if `x` is zero) +static inline size_t mi_bsr(uintptr_t x) { + return (x==0 ? MI_INTPTR_BITS : MI_INTPTR_BITS - 1 - mi_clz(x)); +} + + +// --------------------------------------------------------------------------------- +// Provide our own `_mi_memcpy` for potential performance optimizations. +// +// For now, only on Windows with msvc/clang-cl we optimize to `rep movsb` if +// we happen to run on x86/x64 cpu's that have "fast short rep movsb" (FSRM) support +// (AMD Zen3+ (~2020) or Intel Ice Lake+ (~2017). See also issue #201 and pr #253. +// --------------------------------------------------------------------------------- + +#if defined(_WIN32) && (defined(_M_IX86) || defined(_M_X64)) +#include +#include +extern bool _mi_cpu_has_fsrm; +static inline void _mi_memcpy(void* dst, const void* src, size_t n) { + if (_mi_cpu_has_fsrm) { + __movsb((unsigned char*)dst, (const unsigned char*)src, n); + } + else { + memcpy(dst, src, n); // todo: use noinline? + } +} +#else +#include +static inline void _mi_memcpy(void* dst, const void* src, size_t n) { + memcpy(dst, src, n); +} +#endif + + +// ------------------------------------------------------------------------------- +// The `_mi_memcpy_aligned` can be used if the pointers are machine-word aligned +// This is used for example in `mi_realloc`. +// ------------------------------------------------------------------------------- + +#if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__) +// On GCC/CLang we provide a hint that the pointers are word aligned. +#include +static inline void _mi_memcpy_aligned(void* dst, const void* src, size_t n) { + mi_assert_internal(((uintptr_t)dst % MI_INTPTR_SIZE == 0) && ((uintptr_t)src % MI_INTPTR_SIZE == 0)); + void* adst = __builtin_assume_aligned(dst, MI_INTPTR_SIZE); + const void* asrc = __builtin_assume_aligned(src, MI_INTPTR_SIZE); + _mi_memcpy(adst, asrc, n); +} +#else +// Default fallback on `_mi_memcpy` +static inline void _mi_memcpy_aligned(void* dst, const void* src, size_t n) { + mi_assert_internal(((uintptr_t)dst % MI_INTPTR_SIZE == 0) && ((uintptr_t)src % MI_INTPTR_SIZE == 0)); + _mi_memcpy(dst, src, n); +} +#endif + + +#endif diff --git a/compat/mimalloc/mimalloc-types.h b/compat/mimalloc/mimalloc-types.h new file mode 100644 index 00000000000000..a07858e22bccc0 --- /dev/null +++ b/compat/mimalloc/mimalloc-types.h @@ -0,0 +1,598 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#pragma once +#ifndef MIMALLOC_TYPES_H +#define MIMALLOC_TYPES_H + +#include // ptrdiff_t +#include // uintptr_t, uint16_t, etc +#include "mimalloc-atomic.h" // _Atomic + +#ifdef _MSC_VER +#pragma warning(disable:4214) // bitfield is not int +#endif + +// Minimal alignment necessary. On most platforms 16 bytes are needed +// due to SSE registers for example. This must be at least `sizeof(void*)` +#ifndef MI_MAX_ALIGN_SIZE +#define MI_MAX_ALIGN_SIZE 16 // sizeof(max_align_t) +#endif + +// ------------------------------------------------------ +// Variants +// ------------------------------------------------------ + +// Define NDEBUG in the release version to disable assertions. +// #define NDEBUG + +// Define MI_STAT as 1 to maintain statistics; set it to 2 to have detailed statistics (but costs some performance). +// #define MI_STAT 1 + +// Define MI_SECURE to enable security mitigations +// #define MI_SECURE 1 // guard page around metadata +// #define MI_SECURE 2 // guard page around each mimalloc page +// #define MI_SECURE 3 // encode free lists (detect corrupted free list (buffer overflow), and invalid pointer free) +// #define MI_SECURE 4 // checks for double free. (may be more expensive) + +#if !defined(MI_SECURE) +#define MI_SECURE 0 +#endif + +// Define MI_DEBUG for debug mode +// #define MI_DEBUG 1 // basic assertion checks and statistics, check double free, corrupted free list, and invalid pointer free. +// #define MI_DEBUG 2 // + internal assertion checks +// #define MI_DEBUG 3 // + extensive internal invariant checking (cmake -DMI_DEBUG_FULL=ON) +#if !defined(MI_DEBUG) +#if !defined(NDEBUG) || defined(_DEBUG) +#define MI_DEBUG 2 +#else +#define MI_DEBUG 0 +#endif +#endif + +// Reserve extra padding at the end of each block to be more resilient against heap block overflows. +// The padding can detect byte-precise buffer overflow on free. +#if !defined(MI_PADDING) && (MI_DEBUG>=1) +#define MI_PADDING 1 +#endif + + +// Encoded free lists allow detection of corrupted free lists +// and can detect buffer overflows, modify after free, and double `free`s. +#if (MI_SECURE>=3 || MI_DEBUG>=1 || MI_PADDING > 0) +#define MI_ENCODE_FREELIST 1 +#endif + + +// ------------------------------------------------------ +// Platform specific values +// ------------------------------------------------------ + +// ------------------------------------------------------ +// Size of a pointer. +// We assume that `sizeof(void*)==sizeof(intptr_t)` +// and it holds for all platforms we know of. +// +// However, the C standard only requires that: +// p == (void*)((intptr_t)p)) +// but we also need: +// i == (intptr_t)((void*)i) +// or otherwise one might define an intptr_t type that is larger than a pointer... +// ------------------------------------------------------ + +#if INTPTR_MAX > INT64_MAX +# define MI_INTPTR_SHIFT (4) // assume 128-bit (as on arm CHERI for example) +#elif INTPTR_MAX == INT64_MAX +# define MI_INTPTR_SHIFT (3) +#elif INTPTR_MAX == INT32_MAX +# define MI_INTPTR_SHIFT (2) +#else +#error platform pointers must be 32, 64, or 128 bits +#endif + +#if SIZE_MAX == UINT64_MAX +# define MI_SIZE_SHIFT (3) +typedef int64_t mi_ssize_t; +#elif SIZE_MAX == UINT32_MAX +# define MI_SIZE_SHIFT (2) +typedef int32_t mi_ssize_t; +#else +#error platform objects must be 32 or 64 bits +#endif + +#if (SIZE_MAX/2) > LONG_MAX +# define MI_ZU(x) x##ULL +# define MI_ZI(x) x##LL +#else +# define MI_ZU(x) x##UL +# define MI_ZI(x) x##L +#endif + +#define MI_INTPTR_SIZE (1< 4 +#define MI_SEGMENT_SHIFT (10 + MI_SEGMENT_SLICE_SHIFT) // 64MiB +#else +#define MI_SEGMENT_SHIFT ( 7 + MI_SEGMENT_SLICE_SHIFT) // 4MiB on 32-bit +#endif + +#define MI_SMALL_PAGE_SHIFT (MI_SEGMENT_SLICE_SHIFT) // 64KiB +#define MI_MEDIUM_PAGE_SHIFT ( 3 + MI_SMALL_PAGE_SHIFT) // 512KiB + + +// Derived constants +#define MI_SEGMENT_SIZE (MI_ZU(1)<= 655360) +#error "mimalloc internal: define more bins" +#endif +#if (MI_ALIGNMENT_MAX > MI_SEGMENT_SIZE/2) +#error "mimalloc internal: the max aligned boundary is too large for the segment size" +#endif +#if (MI_ALIGNED_MAX % MI_SEGMENT_SLICE_SIZE != 0) +#error "mimalloc internal: the max aligned boundary must be an integral multiple of the segment slice size" +#endif + +// Maximum slice offset (15) +#define MI_MAX_SLICE_OFFSET ((MI_ALIGNMENT_MAX / MI_SEGMENT_SLICE_SIZE) - 1) + +// Used as a special value to encode block sizes in 32 bits. +#define MI_HUGE_BLOCK_SIZE ((uint32_t)(2*MI_GiB)) + +// blocks up to this size are always allocated aligned +#define MI_MAX_ALIGN_GUARANTEE (8*MI_MAX_ALIGN_SIZE) + + + + +// ------------------------------------------------------ +// Mimalloc pages contain allocated blocks +// ------------------------------------------------------ + +// The free lists use encoded next fields +// (Only actually encodes when MI_ENCODED_FREELIST is defined.) +typedef uintptr_t mi_encoded_t; + +// thread id's +typedef size_t mi_threadid_t; + +// free lists contain blocks +typedef struct mi_block_s { + mi_encoded_t next; +} mi_block_t; + + +// The delayed flags are used for efficient multi-threaded free-ing +typedef enum mi_delayed_e { + MI_USE_DELAYED_FREE = 0, // push on the owning heap thread delayed list + MI_DELAYED_FREEING = 1, // temporary: another thread is accessing the owning heap + MI_NO_DELAYED_FREE = 2, // optimize: push on page local thread free queue if another block is already in the heap thread delayed free list + MI_NEVER_DELAYED_FREE = 3 // sticky, only resets on page reclaim +} mi_delayed_t; + + +// The `in_full` and `has_aligned` page flags are put in a union to efficiently +// test if both are false (`full_aligned == 0`) in the `mi_free` routine. +#if !MI_TSAN +typedef union mi_page_flags_s { + uint8_t full_aligned; + struct { + uint8_t in_full : 1; + uint8_t has_aligned : 1; + } x; +} mi_page_flags_t; +#else +// under thread sanitizer, use a byte for each flag to suppress warning, issue #130 +typedef union mi_page_flags_s { + uint16_t full_aligned; + struct { + uint8_t in_full; + uint8_t has_aligned; + } x; +} mi_page_flags_t; +#endif + +// Thread free list. +// We use the bottom 2 bits of the pointer for mi_delayed_t flags +typedef uintptr_t mi_thread_free_t; + +// A page contains blocks of one specific size (`block_size`). +// Each page has three list of free blocks: +// `free` for blocks that can be allocated, +// `local_free` for freed blocks that are not yet available to `mi_malloc` +// `thread_free` for freed blocks by other threads +// The `local_free` and `thread_free` lists are migrated to the `free` list +// when it is exhausted. The separate `local_free` list is necessary to +// implement a monotonic heartbeat. The `thread_free` list is needed for +// avoiding atomic operations in the common case. +// +// +// `used - |thread_free|` == actual blocks that are in use (alive) +// `used - |thread_free| + |free| + |local_free| == capacity` +// +// We don't count `freed` (as |free|) but use `used` to reduce +// the number of memory accesses in the `mi_page_all_free` function(s). +// +// Notes: +// - Access is optimized for `mi_free` and `mi_page_alloc` (in `alloc.c`) +// - Using `uint16_t` does not seem to slow things down +// - The size is 8 words on 64-bit which helps the page index calculations +// (and 10 words on 32-bit, and encoded free lists add 2 words. Sizes 10 +// and 12 are still good for address calculation) +// - To limit the structure size, the `xblock_size` is 32-bits only; for +// blocks > MI_HUGE_BLOCK_SIZE the size is determined from the segment page size +// - `thread_free` uses the bottom bits as a delayed-free flags to optimize +// concurrent frees where only the first concurrent free adds to the owning +// heap `thread_delayed_free` list (see `alloc.c:mi_free_block_mt`). +// The invariant is that no-delayed-free is only set if there is +// at least one block that will be added, or as already been added, to +// the owning heap `thread_delayed_free` list. This guarantees that pages +// will be freed correctly even if only other threads free blocks. +typedef struct mi_page_s { + // "owned" by the segment + uint32_t slice_count; // slices in this page (0 if not a page) + uint32_t slice_offset; // distance from the actual page data slice (0 if a page) + uint8_t is_reset : 1; // `true` if the page memory was reset + uint8_t is_committed : 1; // `true` if the page virtual memory is committed + uint8_t is_zero_init : 1; // `true` if the page was zero initialized + + // layout like this to optimize access in `mi_malloc` and `mi_free` + uint16_t capacity; // number of blocks committed, must be the first field, see `segment.c:page_clear` + uint16_t reserved; // number of blocks reserved in memory + mi_page_flags_t flags; // `in_full` and `has_aligned` flags (8 bits) + uint8_t is_zero : 1; // `true` if the blocks in the free list are zero initialized + uint8_t retire_expire : 7; // expiration count for retired blocks + + mi_block_t* free; // list of available free blocks (`malloc` allocates from this list) + #ifdef MI_ENCODE_FREELIST + uintptr_t keys[2]; // two random keys to encode the free lists (see `_mi_block_next`) + #endif + uint32_t used; // number of blocks in use (including blocks in `local_free` and `thread_free`) + uint32_t xblock_size; // size available in each block (always `>0`) + + mi_block_t* local_free; // list of deferred free blocks by this thread (migrates to `free`) + _Atomic(mi_thread_free_t) xthread_free; // list of deferred free blocks freed by other threads + _Atomic(uintptr_t) xheap; + + struct mi_page_s* next; // next page owned by this thread with the same `block_size` + struct mi_page_s* prev; // previous page owned by this thread with the same `block_size` + + // 64-bit 9 words, 32-bit 12 words, (+2 for secure) + #if MI_INTPTR_SIZE==8 + uintptr_t padding[1]; + #endif +} mi_page_t; + + + +typedef enum mi_page_kind_e { + MI_PAGE_SMALL, // small blocks go into 64KiB pages inside a segment + MI_PAGE_MEDIUM, // medium blocks go into medium pages inside a segment + MI_PAGE_LARGE, // larger blocks go into a page of just one block + MI_PAGE_HUGE, // huge blocks (> 16 MiB) are put into a single page in a single segment. +} mi_page_kind_t; + +typedef enum mi_segment_kind_e { + MI_SEGMENT_NORMAL, // MI_SEGMENT_SIZE size with pages inside. + MI_SEGMENT_HUGE, // > MI_LARGE_SIZE_MAX segment with just one huge page inside. +} mi_segment_kind_t; + +// ------------------------------------------------------ +// A segment holds a commit mask where a bit is set if +// the corresponding MI_COMMIT_SIZE area is committed. +// The MI_COMMIT_SIZE must be a multiple of the slice +// size. If it is equal we have the most fine grained +// decommit (but setting it higher can be more efficient). +// The MI_MINIMAL_COMMIT_SIZE is the minimal amount that will +// be committed in one go which can be set higher than +// MI_COMMIT_SIZE for efficiency (while the decommit mask +// is still tracked in fine-grained MI_COMMIT_SIZE chunks) +// ------------------------------------------------------ + +#define MI_MINIMAL_COMMIT_SIZE (2*MI_MiB) +#define MI_COMMIT_SIZE (MI_SEGMENT_SLICE_SIZE) // 64KiB +#define MI_COMMIT_MASK_BITS (MI_SEGMENT_SIZE / MI_COMMIT_SIZE) +#define MI_COMMIT_MASK_FIELD_BITS MI_SIZE_BITS +#define MI_COMMIT_MASK_FIELD_COUNT (MI_COMMIT_MASK_BITS / MI_COMMIT_MASK_FIELD_BITS) + +#if (MI_COMMIT_MASK_BITS != (MI_COMMIT_MASK_FIELD_COUNT * MI_COMMIT_MASK_FIELD_BITS)) +#error "the segment size must be exactly divisible by the (commit size * size_t bits)" +#endif + +typedef struct mi_commit_mask_s { + size_t mask[MI_COMMIT_MASK_FIELD_COUNT]; +} mi_commit_mask_t; + +typedef mi_page_t mi_slice_t; +typedef int64_t mi_msecs_t; + + +// Segments are large allocated memory blocks (8mb on 64 bit) from +// the OS. Inside segments we allocated fixed size _pages_ that +// contain blocks. +typedef struct mi_segment_s { + size_t memid; // memory id for arena allocation + bool mem_is_pinned; // `true` if we cannot decommit/reset/protect in this memory (i.e. when allocated using large OS pages) + bool mem_is_large; // in large/huge os pages? + bool mem_is_committed; // `true` if the whole segment is eagerly committed + + bool allow_decommit; + mi_msecs_t decommit_expire; + mi_commit_mask_t decommit_mask; + mi_commit_mask_t commit_mask; + + _Atomic(struct mi_segment_s*) abandoned_next; + + // from here is zero initialized + struct mi_segment_s* next; // the list of freed segments in the cache (must be first field, see `segment.c:mi_segment_init`) + + size_t abandoned; // abandoned pages (i.e. the original owning thread stopped) (`abandoned <= used`) + size_t abandoned_visits; // count how often this segment is visited in the abandoned list (to force reclaim it it is too long) + size_t used; // count of pages in use + uintptr_t cookie; // verify addresses in debug mode: `mi_ptr_cookie(segment) == segment->cookie` + + size_t segment_slices; // for huge segments this may be different from `MI_SLICES_PER_SEGMENT` + size_t segment_info_slices; // initial slices we are using segment info and possible guard pages. + + // layout like this to optimize access in `mi_free` + mi_segment_kind_t kind; + _Atomic(mi_threadid_t) thread_id; // unique id of the thread owning this segment + size_t slice_entries; // entries in the `slices` array, at most `MI_SLICES_PER_SEGMENT` + mi_slice_t slices[MI_SLICES_PER_SEGMENT]; +} mi_segment_t; + + +// ------------------------------------------------------ +// Heaps +// Provide first-class heaps to allocate from. +// A heap just owns a set of pages for allocation and +// can only be allocate/reallocate from the thread that created it. +// Freeing blocks can be done from any thread though. +// Per thread, the segments are shared among its heaps. +// Per thread, there is always a default heap that is +// used for allocation; it is initialized to statically +// point to an empty heap to avoid initialization checks +// in the fast path. +// ------------------------------------------------------ + +// Thread local data +typedef struct mi_tld_s mi_tld_t; + +// Pages of a certain block size are held in a queue. +typedef struct mi_page_queue_s { + mi_page_t* first; + mi_page_t* last; + size_t block_size; +} mi_page_queue_t; + +#define MI_BIN_FULL (MI_BIN_HUGE+1) + +// Random context +typedef struct mi_random_cxt_s { + uint32_t input[16]; + uint32_t output[16]; + int output_available; +} mi_random_ctx_t; + + +// In debug mode there is a padding structure at the end of the blocks to check for buffer overflows +#if (MI_PADDING) +typedef struct mi_padding_s { + uint32_t canary; // encoded block value to check validity of the padding (in case of overflow) + uint32_t delta; // padding bytes before the block. (mi_usable_size(p) - delta == exact allocated bytes) +} mi_padding_t; +#define MI_PADDING_SIZE (sizeof(mi_padding_t)) +#define MI_PADDING_WSIZE ((MI_PADDING_SIZE + MI_INTPTR_SIZE - 1) / MI_INTPTR_SIZE) +#else +#define MI_PADDING_SIZE 0 +#define MI_PADDING_WSIZE 0 +#endif + +#define MI_PAGES_DIRECT (MI_SMALL_WSIZE_MAX + MI_PADDING_WSIZE + 1) + + +// A heap owns a set of pages. +struct mi_heap_s { + mi_tld_t* tld; + mi_page_t* pages_free_direct[MI_PAGES_DIRECT]; // optimize: array where every entry points a page with possibly free blocks in the corresponding queue for that size. + mi_page_queue_t pages[MI_BIN_FULL + 1]; // queue of pages for each size class (or "bin") + _Atomic(mi_block_t*) thread_delayed_free; + mi_threadid_t thread_id; // thread this heap belongs too + uintptr_t cookie; // random cookie to verify pointers (see `_mi_ptr_cookie`) + uintptr_t keys[2]; // two random keys used to encode the `thread_delayed_free` list + mi_random_ctx_t random; // random number context used for secure allocation + size_t page_count; // total number of pages in the `pages` queues. + size_t page_retired_min; // smallest retired index (retired pages are fully free, but still in the page queues) + size_t page_retired_max; // largest retired index into the `pages` array. + mi_heap_t* next; // list of heaps per thread + bool no_reclaim; // `true` if this heap should not reclaim abandoned pages +}; + + + +// ------------------------------------------------------ +// Debug +// ------------------------------------------------------ + +#if !defined(MI_DEBUG_UNINIT) +#define MI_DEBUG_UNINIT (0xD0) +#endif +#if !defined(MI_DEBUG_FREED) +#define MI_DEBUG_FREED (0xDF) +#endif +#if !defined(MI_DEBUG_PADDING) +#define MI_DEBUG_PADDING (0xDE) +#endif + +#if (MI_DEBUG) +// use our own assertion to print without memory allocation +void _mi_assert_fail(const char* assertion, const char* fname, unsigned int line, const char* func ); +#define mi_assert(expr) ((expr) ? (void)0 : _mi_assert_fail(#expr,__FILE__,__LINE__,__func__)) +#else +#define mi_assert(x) +#endif + +#if (MI_DEBUG>1) +#define mi_assert_internal mi_assert +#else +#define mi_assert_internal(x) +#endif + +#if (MI_DEBUG>2) +#define mi_assert_expensive mi_assert +#else +#define mi_assert_expensive(x) +#endif + +// ------------------------------------------------------ +// Statistics +// ------------------------------------------------------ + +#ifndef MI_STAT +#if (MI_DEBUG>0) +#define MI_STAT 2 +#else +#define MI_STAT 0 +#endif +#endif + +typedef struct mi_stat_count_s { + int64_t allocated; + int64_t freed; + int64_t peak; + int64_t current; +} mi_stat_count_t; + +typedef struct mi_stat_counter_s { + int64_t total; + int64_t count; +} mi_stat_counter_t; + +typedef struct mi_stats_s { + mi_stat_count_t segments; + mi_stat_count_t pages; + mi_stat_count_t reserved; + mi_stat_count_t committed; + mi_stat_count_t reset; + mi_stat_count_t page_committed; + mi_stat_count_t segments_abandoned; + mi_stat_count_t pages_abandoned; + mi_stat_count_t threads; + mi_stat_count_t normal; + mi_stat_count_t huge; + mi_stat_count_t large; + mi_stat_count_t malloc; + mi_stat_count_t segments_cache; + mi_stat_counter_t pages_extended; + mi_stat_counter_t mmap_calls; + mi_stat_counter_t commit_calls; + mi_stat_counter_t page_no_retire; + mi_stat_counter_t searches; + mi_stat_counter_t normal_count; + mi_stat_counter_t huge_count; + mi_stat_counter_t large_count; +#if MI_STAT>1 + mi_stat_count_t normal_bins[MI_BIN_HUGE+1]; +#endif +} mi_stats_t; + + +void _mi_stat_increase(mi_stat_count_t* stat, size_t amount); +void _mi_stat_decrease(mi_stat_count_t* stat, size_t amount); +void _mi_stat_counter_increase(mi_stat_counter_t* stat, size_t amount); + +#if (MI_STAT) +#define mi_stat_increase(stat,amount) _mi_stat_increase( &(stat), amount) +#define mi_stat_decrease(stat,amount) _mi_stat_decrease( &(stat), amount) +#define mi_stat_counter_increase(stat,amount) _mi_stat_counter_increase( &(stat), amount) +#else +#define mi_stat_increase(stat,amount) (void)0 +#define mi_stat_decrease(stat,amount) (void)0 +#define mi_stat_counter_increase(stat,amount) (void)0 +#endif + +#define mi_heap_stat_counter_increase(heap,stat,amount) mi_stat_counter_increase( (heap)->tld->stats.stat, amount) +#define mi_heap_stat_increase(heap,stat,amount) mi_stat_increase( (heap)->tld->stats.stat, amount) +#define mi_heap_stat_decrease(heap,stat,amount) mi_stat_decrease( (heap)->tld->stats.stat, amount) + +// ------------------------------------------------------ +// Thread Local data +// ------------------------------------------------------ + +// A "span" is is an available range of slices. The span queues keep +// track of slice spans of at most the given `slice_count` (but more than the previous size class). +typedef struct mi_span_queue_s { + mi_slice_t* first; + mi_slice_t* last; + size_t slice_count; +} mi_span_queue_t; + +#define MI_SEGMENT_BIN_MAX (35) // 35 == mi_segment_bin(MI_SLICES_PER_SEGMENT) + +// OS thread local data +typedef struct mi_os_tld_s { + size_t region_idx; // start point for next allocation + mi_stats_t* stats; // points to tld stats +} mi_os_tld_t; + + +// Segments thread local data +typedef struct mi_segments_tld_s { + mi_span_queue_t spans[MI_SEGMENT_BIN_MAX+1]; // free slice spans inside segments + size_t count; // current number of segments; + size_t peak_count; // peak number of segments + size_t current_size; // current size of all segments + size_t peak_size; // peak size of all segments + mi_stats_t* stats; // points to tld stats + mi_os_tld_t* os; // points to os stats +} mi_segments_tld_t; + +// Thread local data +struct mi_tld_s { + unsigned long long heartbeat; // monotonic heartbeat count + bool recurse; // true if deferred was called; used to prevent infinite recursion. + mi_heap_t* heap_backing; // backing heap of this thread (cannot be deleted) + mi_heap_t* heaps; // list of heaps in this thread (so we can abandon all when the thread terminates) + mi_segments_tld_t segments; // segment tld + mi_os_tld_t os; // os tld + mi_stats_t stats; // statistics +}; + +#endif diff --git a/compat/mimalloc/mimalloc.h b/compat/mimalloc/mimalloc.h new file mode 100644 index 00000000000000..6a6f1b373be1d4 --- /dev/null +++ b/compat/mimalloc/mimalloc.h @@ -0,0 +1,453 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2022, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#pragma once +#ifndef MIMALLOC_H +#define MIMALLOC_H + +#define MI_MALLOC_VERSION 206 // major + 2 digits minor + +// ------------------------------------------------------ +// Compiler specific attributes +// ------------------------------------------------------ + +#ifdef __cplusplus + #if (__cplusplus >= 201103L) || (_MSC_VER > 1900) // C++11 + #define mi_attr_noexcept noexcept + #else + #define mi_attr_noexcept throw() + #endif +#else + #define mi_attr_noexcept +#endif + +#if defined(__cplusplus) && (__cplusplus >= 201703) + #define mi_decl_nodiscard [[nodiscard]] +#elif (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__) // includes clang, icc, and clang-cl + #define mi_decl_nodiscard __attribute__((warn_unused_result)) +#elif (_MSC_VER >= 1700) + #define mi_decl_nodiscard _Check_return_ +#else + #define mi_decl_nodiscard +#endif + +#if defined(_MSC_VER) || defined(__MINGW32__) + #if !defined(MI_SHARED_LIB) + #define mi_decl_export + #elif defined(MI_SHARED_LIB_EXPORT) + #define mi_decl_export __declspec(dllexport) + #else + #define mi_decl_export __declspec(dllimport) + #endif + #if defined(__MINGW32__) + #define mi_decl_restrict + #define mi_attr_malloc __attribute__((malloc)) + #else + #if (_MSC_VER >= 1900) && !defined(__EDG__) + #define mi_decl_restrict __declspec(allocator) __declspec(restrict) + #else + #define mi_decl_restrict __declspec(restrict) + #endif + #define mi_attr_malloc + #endif + #define mi_cdecl __cdecl + #define mi_attr_alloc_size(s) + #define mi_attr_alloc_size2(s1,s2) + #define mi_attr_alloc_align(p) +#elif defined(__GNUC__) // includes clang and icc + #if defined(MI_SHARED_LIB) && defined(MI_SHARED_LIB_EXPORT) + #define mi_decl_export __attribute__((visibility("default"))) + #else + #define mi_decl_export + #endif + #define mi_cdecl // leads to warnings... __attribute__((cdecl)) + #define mi_decl_restrict + #define mi_attr_malloc __attribute__((malloc)) + #if (defined(__clang_major__) && (__clang_major__ < 4)) || (__GNUC__ < 5) + #define mi_attr_alloc_size(s) + #define mi_attr_alloc_size2(s1,s2) + #define mi_attr_alloc_align(p) + #elif defined(__INTEL_COMPILER) + #define mi_attr_alloc_size(s) __attribute__((alloc_size(s))) + #define mi_attr_alloc_size2(s1,s2) __attribute__((alloc_size(s1,s2))) + #define mi_attr_alloc_align(p) + #else + #define mi_attr_alloc_size(s) __attribute__((alloc_size(s))) + #define mi_attr_alloc_size2(s1,s2) __attribute__((alloc_size(s1,s2))) + #define mi_attr_alloc_align(p) __attribute__((alloc_align(p))) + #endif +#else + #define mi_cdecl + #define mi_decl_export + #define mi_decl_restrict + #define mi_attr_malloc + #define mi_attr_alloc_size(s) + #define mi_attr_alloc_size2(s1,s2) + #define mi_attr_alloc_align(p) +#endif + +// ------------------------------------------------------ +// Includes +// ------------------------------------------------------ + +#include // size_t +#include // bool + +#ifdef __cplusplus +extern "C" { +#endif + +// ------------------------------------------------------ +// Standard malloc interface +// ------------------------------------------------------ + +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_malloc(size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_calloc(size_t count, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(1,2); +mi_decl_nodiscard mi_decl_export void* mi_realloc(void* p, size_t newsize) mi_attr_noexcept mi_attr_alloc_size(2); +mi_decl_export void* mi_expand(void* p, size_t newsize) mi_attr_noexcept mi_attr_alloc_size(2); + +mi_decl_export void mi_free(void* p) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export mi_decl_restrict char* mi_strdup(const char* s) mi_attr_noexcept mi_attr_malloc; +mi_decl_nodiscard mi_decl_export mi_decl_restrict char* mi_strndup(const char* s, size_t n) mi_attr_noexcept mi_attr_malloc; +mi_decl_nodiscard mi_decl_export mi_decl_restrict char* mi_realpath(const char* fname, char* resolved_name) mi_attr_noexcept mi_attr_malloc; + +// ------------------------------------------------------ +// Extended functionality +// ------------------------------------------------------ +#define MI_SMALL_WSIZE_MAX (128) +#define MI_SMALL_SIZE_MAX (MI_SMALL_WSIZE_MAX*sizeof(void*)) + +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_malloc_small(size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_zalloc_small(size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_zalloc(size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); + +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_mallocn(size_t count, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(1,2); +mi_decl_nodiscard mi_decl_export void* mi_reallocn(void* p, size_t count, size_t size) mi_attr_noexcept mi_attr_alloc_size2(2,3); +mi_decl_nodiscard mi_decl_export void* mi_reallocf(void* p, size_t newsize) mi_attr_noexcept mi_attr_alloc_size(2); + +mi_decl_nodiscard mi_decl_export size_t mi_usable_size(const void* p) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export size_t mi_good_size(size_t size) mi_attr_noexcept; + + +// ------------------------------------------------------ +// Internals +// ------------------------------------------------------ + +typedef void (mi_cdecl mi_deferred_free_fun)(bool force, unsigned long long heartbeat, void* arg); +mi_decl_export void mi_register_deferred_free(mi_deferred_free_fun* deferred_free, void* arg) mi_attr_noexcept; + +typedef void (mi_cdecl mi_output_fun)(const char* msg, void* arg); +mi_decl_export void mi_register_output(mi_output_fun* out, void* arg) mi_attr_noexcept; + +typedef void (mi_cdecl mi_error_fun)(int err, void* arg); +mi_decl_export void mi_register_error(mi_error_fun* fun, void* arg); + +mi_decl_export void mi_collect(bool force) mi_attr_noexcept; +mi_decl_export int mi_version(void) mi_attr_noexcept; +mi_decl_export void mi_stats_reset(void) mi_attr_noexcept; +mi_decl_export void mi_stats_merge(void) mi_attr_noexcept; +mi_decl_export void mi_stats_print(void* out) mi_attr_noexcept; // backward compatibility: `out` is ignored and should be NULL +mi_decl_export void mi_stats_print_out(mi_output_fun* out, void* arg) mi_attr_noexcept; + +mi_decl_export void mi_process_init(void) mi_attr_noexcept; +mi_decl_export void mi_thread_init(void) mi_attr_noexcept; +mi_decl_export void mi_thread_done(void) mi_attr_noexcept; +mi_decl_export void mi_thread_stats_print_out(mi_output_fun* out, void* arg) mi_attr_noexcept; + +mi_decl_export void mi_process_info(size_t* elapsed_msecs, size_t* user_msecs, size_t* system_msecs, + size_t* current_rss, size_t* peak_rss, + size_t* current_commit, size_t* peak_commit, size_t* page_faults) mi_attr_noexcept; + +// ------------------------------------------------------------------------------------- +// Aligned allocation +// Note that `alignment` always follows `size` for consistency with unaligned +// allocation, but unfortunately this differs from `posix_memalign` and `aligned_alloc`. +// ------------------------------------------------------------------------------------- +#define MI_ALIGNMENT_MAX (1024*1024UL) // maximum supported alignment is 1MiB + +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_malloc_aligned(size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1) mi_attr_alloc_align(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_malloc_aligned_at(size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_zalloc_aligned(size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1) mi_attr_alloc_align(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_zalloc_aligned_at(size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_calloc_aligned(size_t count, size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(1,2) mi_attr_alloc_align(3); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_calloc_aligned_at(size_t count, size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(1,2); +mi_decl_nodiscard mi_decl_export void* mi_realloc_aligned(void* p, size_t newsize, size_t alignment) mi_attr_noexcept mi_attr_alloc_size(2) mi_attr_alloc_align(3); +mi_decl_nodiscard mi_decl_export void* mi_realloc_aligned_at(void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_alloc_size(2); + + +// ------------------------------------------------------------------------------------- +// Heaps: first-class, but can only allocate from the same thread that created it. +// ------------------------------------------------------------------------------------- + +struct mi_heap_s; +typedef struct mi_heap_s mi_heap_t; + +mi_decl_nodiscard mi_decl_export mi_heap_t* mi_heap_new(void); +mi_decl_export void mi_heap_delete(mi_heap_t* heap); +mi_decl_export void mi_heap_destroy(mi_heap_t* heap); +mi_decl_export mi_heap_t* mi_heap_set_default(mi_heap_t* heap); +mi_decl_export mi_heap_t* mi_heap_get_default(void); +mi_decl_export mi_heap_t* mi_heap_get_backing(void); +mi_decl_export void mi_heap_collect(mi_heap_t* heap, bool force) mi_attr_noexcept; + +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_malloc(mi_heap_t* heap, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_zalloc(mi_heap_t* heap, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_calloc(mi_heap_t* heap, size_t count, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(2, 3); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_mallocn(mi_heap_t* heap, size_t count, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(2, 3); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_malloc_small(mi_heap_t* heap, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2); + +mi_decl_nodiscard mi_decl_export void* mi_heap_realloc(mi_heap_t* heap, void* p, size_t newsize) mi_attr_noexcept mi_attr_alloc_size(3); +mi_decl_nodiscard mi_decl_export void* mi_heap_reallocn(mi_heap_t* heap, void* p, size_t count, size_t size) mi_attr_noexcept mi_attr_alloc_size2(3,4); +mi_decl_nodiscard mi_decl_export void* mi_heap_reallocf(mi_heap_t* heap, void* p, size_t newsize) mi_attr_noexcept mi_attr_alloc_size(3); + +mi_decl_nodiscard mi_decl_export mi_decl_restrict char* mi_heap_strdup(mi_heap_t* heap, const char* s) mi_attr_noexcept mi_attr_malloc; +mi_decl_nodiscard mi_decl_export mi_decl_restrict char* mi_heap_strndup(mi_heap_t* heap, const char* s, size_t n) mi_attr_noexcept mi_attr_malloc; +mi_decl_nodiscard mi_decl_export mi_decl_restrict char* mi_heap_realpath(mi_heap_t* heap, const char* fname, char* resolved_name) mi_attr_noexcept mi_attr_malloc; + +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_malloc_aligned(mi_heap_t* heap, size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2) mi_attr_alloc_align(3); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_malloc_aligned_at(mi_heap_t* heap, size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_zalloc_aligned(mi_heap_t* heap, size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2) mi_attr_alloc_align(3); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_zalloc_aligned_at(mi_heap_t* heap, size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_calloc_aligned(mi_heap_t* heap, size_t count, size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(2, 3) mi_attr_alloc_align(4); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_heap_calloc_aligned_at(mi_heap_t* heap, size_t count, size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size2(2, 3); +mi_decl_nodiscard mi_decl_export void* mi_heap_realloc_aligned(mi_heap_t* heap, void* p, size_t newsize, size_t alignment) mi_attr_noexcept mi_attr_alloc_size(3) mi_attr_alloc_align(4); +mi_decl_nodiscard mi_decl_export void* mi_heap_realloc_aligned_at(mi_heap_t* heap, void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_alloc_size(3); + + +// -------------------------------------------------------------------------------- +// Zero initialized re-allocation. +// Only valid on memory that was originally allocated with zero initialization too. +// e.g. `mi_calloc`, `mi_zalloc`, `mi_zalloc_aligned` etc. +// see +// -------------------------------------------------------------------------------- + +mi_decl_nodiscard mi_decl_export void* mi_rezalloc(void* p, size_t newsize) mi_attr_noexcept mi_attr_alloc_size(2); +mi_decl_nodiscard mi_decl_export void* mi_recalloc(void* p, size_t newcount, size_t size) mi_attr_noexcept mi_attr_alloc_size2(2,3); + +mi_decl_nodiscard mi_decl_export void* mi_rezalloc_aligned(void* p, size_t newsize, size_t alignment) mi_attr_noexcept mi_attr_alloc_size(2) mi_attr_alloc_align(3); +mi_decl_nodiscard mi_decl_export void* mi_rezalloc_aligned_at(void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_alloc_size(2); +mi_decl_nodiscard mi_decl_export void* mi_recalloc_aligned(void* p, size_t newcount, size_t size, size_t alignment) mi_attr_noexcept mi_attr_alloc_size2(2,3) mi_attr_alloc_align(4); +mi_decl_nodiscard mi_decl_export void* mi_recalloc_aligned_at(void* p, size_t newcount, size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_alloc_size2(2,3); + +mi_decl_nodiscard mi_decl_export void* mi_heap_rezalloc(mi_heap_t* heap, void* p, size_t newsize) mi_attr_noexcept mi_attr_alloc_size(3); +mi_decl_nodiscard mi_decl_export void* mi_heap_recalloc(mi_heap_t* heap, void* p, size_t newcount, size_t size) mi_attr_noexcept mi_attr_alloc_size2(3,4); + +mi_decl_nodiscard mi_decl_export void* mi_heap_rezalloc_aligned(mi_heap_t* heap, void* p, size_t newsize, size_t alignment) mi_attr_noexcept mi_attr_alloc_size(3) mi_attr_alloc_align(4); +mi_decl_nodiscard mi_decl_export void* mi_heap_rezalloc_aligned_at(mi_heap_t* heap, void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_alloc_size(3); +mi_decl_nodiscard mi_decl_export void* mi_heap_recalloc_aligned(mi_heap_t* heap, void* p, size_t newcount, size_t size, size_t alignment) mi_attr_noexcept mi_attr_alloc_size2(3,4) mi_attr_alloc_align(5); +mi_decl_nodiscard mi_decl_export void* mi_heap_recalloc_aligned_at(mi_heap_t* heap, void* p, size_t newcount, size_t size, size_t alignment, size_t offset) mi_attr_noexcept mi_attr_alloc_size2(3,4); + + +// ------------------------------------------------------ +// Analysis +// ------------------------------------------------------ + +mi_decl_export bool mi_heap_contains_block(mi_heap_t* heap, const void* p); +mi_decl_export bool mi_heap_check_owned(mi_heap_t* heap, const void* p); +mi_decl_export bool mi_check_owned(const void* p); + +// An area of heap space contains blocks of a single size. +typedef struct mi_heap_area_s { + void* blocks; // start of the area containing heap blocks + size_t reserved; // bytes reserved for this area (virtual) + size_t committed; // current available bytes for this area + size_t used; // number of allocated blocks + size_t block_size; // size in bytes of each block + size_t full_block_size; // size in bytes of a full block including padding and metadata. +} mi_heap_area_t; + +typedef bool (mi_cdecl mi_block_visit_fun)(const mi_heap_t* heap, const mi_heap_area_t* area, void* block, size_t block_size, void* arg); + +mi_decl_export bool mi_heap_visit_blocks(const mi_heap_t* heap, bool visit_all_blocks, mi_block_visit_fun* visitor, void* arg); + +// Experimental +mi_decl_nodiscard mi_decl_export bool mi_is_in_heap_region(const void* p) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export bool mi_is_redirected(void) mi_attr_noexcept; + +mi_decl_export int mi_reserve_huge_os_pages_interleave(size_t pages, size_t numa_nodes, size_t timeout_msecs) mi_attr_noexcept; +mi_decl_export int mi_reserve_huge_os_pages_at(size_t pages, int numa_node, size_t timeout_msecs) mi_attr_noexcept; + +mi_decl_export int mi_reserve_os_memory(size_t size, bool commit, bool allow_large) mi_attr_noexcept; +mi_decl_export bool mi_manage_os_memory(void* start, size_t size, bool is_committed, bool is_large, bool is_zero, int numa_node) mi_attr_noexcept; + +mi_decl_export void mi_debug_show_arenas(void) mi_attr_noexcept; + +// deprecated +mi_decl_export int mi_reserve_huge_os_pages(size_t pages, double max_secs, size_t* pages_reserved) mi_attr_noexcept; + + +// ------------------------------------------------------ +// Convenience +// ------------------------------------------------------ + +#define mi_malloc_tp(tp) ((tp*)mi_malloc(sizeof(tp))) +#define mi_zalloc_tp(tp) ((tp*)mi_zalloc(sizeof(tp))) +#define mi_calloc_tp(tp,n) ((tp*)mi_calloc(n,sizeof(tp))) +#define mi_mallocn_tp(tp,n) ((tp*)mi_mallocn(n,sizeof(tp))) +#define mi_reallocn_tp(p,tp,n) ((tp*)mi_reallocn(p,n,sizeof(tp))) +#define mi_recalloc_tp(p,tp,n) ((tp*)mi_recalloc(p,n,sizeof(tp))) + +#define mi_heap_malloc_tp(hp,tp) ((tp*)mi_heap_malloc(hp,sizeof(tp))) +#define mi_heap_zalloc_tp(hp,tp) ((tp*)mi_heap_zalloc(hp,sizeof(tp))) +#define mi_heap_calloc_tp(hp,tp,n) ((tp*)mi_heap_calloc(hp,n,sizeof(tp))) +#define mi_heap_mallocn_tp(hp,tp,n) ((tp*)mi_heap_mallocn(hp,n,sizeof(tp))) +#define mi_heap_reallocn_tp(hp,p,tp,n) ((tp*)mi_heap_reallocn(hp,p,n,sizeof(tp))) +#define mi_heap_recalloc_tp(hp,p,tp,n) ((tp*)mi_heap_recalloc(hp,p,n,sizeof(tp))) + + +// ------------------------------------------------------ +// Options +// ------------------------------------------------------ + +typedef enum mi_option_e { + // stable options + mi_option_show_errors, + mi_option_show_stats, + mi_option_verbose, + // some of the following options are experimental + // (deprecated options are kept for binary backward compatibility with v1.x versions) + mi_option_eager_commit, + mi_option_deprecated_eager_region_commit, + mi_option_deprecated_reset_decommits, + mi_option_large_os_pages, // use large (2MiB) OS pages, implies eager commit + mi_option_reserve_huge_os_pages, // reserve N huge OS pages (1GiB) at startup + mi_option_reserve_huge_os_pages_at, // reserve huge OS pages at a specific NUMA node + mi_option_reserve_os_memory, // reserve specified amount of OS memory at startup + mi_option_deprecated_segment_cache, + mi_option_page_reset, + mi_option_abandoned_page_decommit, + mi_option_deprecated_segment_reset, + mi_option_eager_commit_delay, + mi_option_decommit_delay, + mi_option_use_numa_nodes, // 0 = use available numa nodes, otherwise use at most N nodes. + mi_option_limit_os_alloc, // 1 = do not use OS memory for allocation (but only reserved arenas) + mi_option_os_tag, + mi_option_max_errors, + mi_option_max_warnings, + mi_option_max_segment_reclaim, + mi_option_allow_decommit, + mi_option_segment_decommit_delay, + mi_option_decommit_extend_delay, + _mi_option_last +} mi_option_t; + + +mi_decl_nodiscard mi_decl_export bool mi_option_is_enabled(mi_option_t option); +mi_decl_export void mi_option_enable(mi_option_t option); +mi_decl_export void mi_option_disable(mi_option_t option); +mi_decl_export void mi_option_set_enabled(mi_option_t option, bool enable); +mi_decl_export void mi_option_set_enabled_default(mi_option_t option, bool enable); + +mi_decl_nodiscard mi_decl_export long mi_option_get(mi_option_t option); +mi_decl_nodiscard mi_decl_export long mi_option_get_clamp(mi_option_t option, long min, long max); +mi_decl_export void mi_option_set(mi_option_t option, long value); +mi_decl_export void mi_option_set_default(mi_option_t option, long value); + + +// ------------------------------------------------------------------------------------------------------- +// "mi" prefixed implementations of various posix, Unix, Windows, and C++ allocation functions. +// (This can be convenient when providing overrides of these functions as done in `mimalloc-override.h`.) +// note: we use `mi_cfree` as "checked free" and it checks if the pointer is in our heap before free-ing. +// ------------------------------------------------------------------------------------------------------- + +mi_decl_export void mi_cfree(void* p) mi_attr_noexcept; +mi_decl_export void* mi__expand(void* p, size_t newsize) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export size_t mi_malloc_size(const void* p) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export size_t mi_malloc_good_size(size_t size) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export size_t mi_malloc_usable_size(const void *p) mi_attr_noexcept; + +mi_decl_export int mi_posix_memalign(void** p, size_t alignment, size_t size) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_memalign(size_t alignment, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2) mi_attr_alloc_align(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_valloc(size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_pvalloc(size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_aligned_alloc(size_t alignment, size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(2) mi_attr_alloc_align(1); + +mi_decl_nodiscard mi_decl_export void* mi_reallocarray(void* p, size_t count, size_t size) mi_attr_noexcept mi_attr_alloc_size2(2,3); +mi_decl_nodiscard mi_decl_export int mi_reallocarr(void* p, size_t count, size_t size) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export void* mi_aligned_recalloc(void* p, size_t newcount, size_t size, size_t alignment) mi_attr_noexcept; +mi_decl_nodiscard mi_decl_export void* mi_aligned_offset_recalloc(void* p, size_t newcount, size_t size, size_t alignment, size_t offset) mi_attr_noexcept; + +mi_decl_nodiscard mi_decl_export mi_decl_restrict unsigned short* mi_wcsdup(const unsigned short* s) mi_attr_noexcept mi_attr_malloc; +mi_decl_nodiscard mi_decl_export mi_decl_restrict unsigned char* mi_mbsdup(const unsigned char* s) mi_attr_noexcept mi_attr_malloc; +mi_decl_export int mi_dupenv_s(char** buf, size_t* size, const char* name) mi_attr_noexcept; +mi_decl_export int mi_wdupenv_s(unsigned short** buf, size_t* size, const unsigned short* name) mi_attr_noexcept; + +mi_decl_export void mi_free_size(void* p, size_t size) mi_attr_noexcept; +mi_decl_export void mi_free_size_aligned(void* p, size_t size, size_t alignment) mi_attr_noexcept; +mi_decl_export void mi_free_aligned(void* p, size_t alignment) mi_attr_noexcept; + +// The `mi_new` wrappers implement C++ semantics on out-of-memory instead of directly returning `NULL`. +// (and call `std::get_new_handler` and potentially raise a `std::bad_alloc` exception). +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_new(size_t size) mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_new_aligned(size_t size, size_t alignment) mi_attr_malloc mi_attr_alloc_size(1) mi_attr_alloc_align(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_new_nothrow(size_t size) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_new_aligned_nothrow(size_t size, size_t alignment) mi_attr_noexcept mi_attr_malloc mi_attr_alloc_size(1) mi_attr_alloc_align(2); +mi_decl_nodiscard mi_decl_export mi_decl_restrict void* mi_new_n(size_t count, size_t size) mi_attr_malloc mi_attr_alloc_size2(1, 2); +mi_decl_nodiscard mi_decl_export void* mi_new_realloc(void* p, size_t newsize) mi_attr_alloc_size(2); +mi_decl_nodiscard mi_decl_export void* mi_new_reallocn(void* p, size_t newcount, size_t size) mi_attr_alloc_size2(2, 3); + +#ifdef __cplusplus +} +#endif + +// --------------------------------------------------------------------------------------------- +// Implement the C++ std::allocator interface for use in STL containers. +// (note: see `mimalloc-new-delete.h` for overriding the new/delete operators globally) +// --------------------------------------------------------------------------------------------- +#ifdef __cplusplus + +#include // std::size_t +#include // PTRDIFF_MAX +#if (__cplusplus >= 201103L) || (_MSC_VER > 1900) // C++11 +#include // std::true_type +#include // std::forward +#endif + +template struct mi_stl_allocator { + typedef T value_type; + typedef std::size_t size_type; + typedef std::ptrdiff_t difference_type; + typedef value_type& reference; + typedef value_type const& const_reference; + typedef value_type* pointer; + typedef value_type const* const_pointer; + template struct rebind { typedef mi_stl_allocator other; }; + + mi_stl_allocator() mi_attr_noexcept = default; + mi_stl_allocator(const mi_stl_allocator&) mi_attr_noexcept = default; + template mi_stl_allocator(const mi_stl_allocator&) mi_attr_noexcept { } + mi_stl_allocator select_on_container_copy_construction() const { return *this; } + void deallocate(T* p, size_type) { mi_free(p); } + + #if (__cplusplus >= 201703L) // C++17 + mi_decl_nodiscard T* allocate(size_type count) { return static_cast(mi_new_n(count, sizeof(T))); } + mi_decl_nodiscard T* allocate(size_type count, const void*) { return allocate(count); } + #else + mi_decl_nodiscard pointer allocate(size_type count, const void* = 0) { return static_cast(mi_new_n(count, sizeof(value_type))); } + #endif + + #if ((__cplusplus >= 201103L) || (_MSC_VER > 1900)) // C++11 + using propagate_on_container_copy_assignment = std::true_type; + using propagate_on_container_move_assignment = std::true_type; + using propagate_on_container_swap = std::true_type; + using is_always_equal = std::true_type; + template void construct(U* p, Args&& ...args) { ::new(p) U(std::forward(args)...); } + template void destroy(U* p) mi_attr_noexcept { p->~U(); } + #else + void construct(pointer p, value_type const& val) { ::new(p) value_type(val); } + void destroy(pointer p) { p->~value_type(); } + #endif + + size_type max_size() const mi_attr_noexcept { return (PTRDIFF_MAX/sizeof(value_type)); } + pointer address(reference x) const { return &x; } + const_pointer address(const_reference x) const { return &x; } +}; + +template bool operator==(const mi_stl_allocator& , const mi_stl_allocator& ) mi_attr_noexcept { return true; } +template bool operator!=(const mi_stl_allocator& , const mi_stl_allocator& ) mi_attr_noexcept { return false; } +#endif // __cplusplus + +#endif diff --git a/compat/mimalloc/options.c b/compat/mimalloc/options.c new file mode 100644 index 00000000000000..7497e70a7baee2 --- /dev/null +++ b/compat/mimalloc/options.c @@ -0,0 +1,627 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include +#include // strtol +#include // strncpy, strncat, strlen, strstr +#include // toupper +#include + +#ifdef _MSC_VER +#pragma warning(disable:4996) // strncpy, strncat +#endif + + +static long mi_max_error_count = 16; // stop outputting errors after this (use < 0 for no limit) +static long mi_max_warning_count = 16; // stop outputting warnings after this (use < 0 for no limit) + +static void mi_add_stderr_output(void); + +int mi_version(void) mi_attr_noexcept { + return MI_MALLOC_VERSION; +} + +#ifdef _WIN32 +#include +#endif + +// -------------------------------------------------------- +// Options +// These can be accessed by multiple threads and may be +// concurrently initialized, but an initializing data race +// is ok since they resolve to the same value. +// -------------------------------------------------------- +typedef enum mi_init_e { + UNINIT, // not yet initialized + DEFAULTED, // not found in the environment, use default value + INITIALIZED // found in environment or set explicitly +} mi_init_t; + +typedef struct mi_option_desc_s { + long value; // the value + mi_init_t init; // is it initialized yet? (from the environment) + mi_option_t option; // for debugging: the option index should match the option + const char* name; // option name without `mimalloc_` prefix + const char* legacy_name; // potential legacy v1.x option name +} mi_option_desc_t; + +#define MI_OPTION(opt) mi_option_##opt, #opt, NULL +#define MI_OPTION_LEGACY(opt,legacy) mi_option_##opt, #opt, #legacy + +static mi_option_desc_t options[_mi_option_last] = +{ + // stable options + #if MI_DEBUG || defined(MI_SHOW_ERRORS) + { 1, UNINIT, MI_OPTION(show_errors) }, + #else + { 0, UNINIT, MI_OPTION(show_errors) }, + #endif + { 0, UNINIT, MI_OPTION(show_stats) }, + { 0, UNINIT, MI_OPTION(verbose) }, + + // Some of the following options are experimental and not all combinations are valid. Use with care. + { 1, UNINIT, MI_OPTION(eager_commit) }, // commit per segment directly (8MiB) (but see also `eager_commit_delay`) + { 0, UNINIT, MI_OPTION(deprecated_eager_region_commit) }, + { 0, UNINIT, MI_OPTION(deprecated_reset_decommits) }, + { 0, UNINIT, MI_OPTION(large_os_pages) }, // use large OS pages, use only with eager commit to prevent fragmentation of VMA's + { 0, UNINIT, MI_OPTION(reserve_huge_os_pages) }, // per 1GiB huge pages + { -1, UNINIT, MI_OPTION(reserve_huge_os_pages_at) }, // reserve huge pages at node N + { 0, UNINIT, MI_OPTION(reserve_os_memory) }, + { 0, UNINIT, MI_OPTION(deprecated_segment_cache) }, // cache N segments per thread + { 0, UNINIT, MI_OPTION(page_reset) }, // reset page memory on free + { 0, UNINIT, MI_OPTION_LEGACY(abandoned_page_decommit, abandoned_page_reset) },// decommit free page memory when a thread terminates + { 0, UNINIT, MI_OPTION(deprecated_segment_reset) }, + #if defined(__NetBSD__) + { 0, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed + #elif defined(_WIN32) + { 4, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed (but per page in the segment on demand) + #else + { 1, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed (but per page in the segment on demand) + #endif + { 25, UNINIT, MI_OPTION_LEGACY(decommit_delay, reset_delay) }, // page decommit delay in milli-seconds + { 0, UNINIT, MI_OPTION(use_numa_nodes) }, // 0 = use available numa nodes, otherwise use at most N nodes. + { 0, UNINIT, MI_OPTION(limit_os_alloc) }, // 1 = do not use OS memory for allocation (but only reserved arenas) + { 100, UNINIT, MI_OPTION(os_tag) }, // only apple specific for now but might serve more or less related purpose + { 16, UNINIT, MI_OPTION(max_errors) }, // maximum errors that are output + { 16, UNINIT, MI_OPTION(max_warnings) }, // maximum warnings that are output + { 8, UNINIT, MI_OPTION(max_segment_reclaim)},// max. number of segment reclaims from the abandoned segments per try. + { 1, UNINIT, MI_OPTION(allow_decommit) }, // decommit slices when no longer used (after decommit_delay milli-seconds) + { 500, UNINIT, MI_OPTION(segment_decommit_delay) }, // decommit delay in milli-seconds for freed segments + { 2, UNINIT, MI_OPTION(decommit_extend_delay) } +}; + +static void mi_option_init(mi_option_desc_t* desc); + +void _mi_options_init(void) { + // called on process load; should not be called before the CRT is initialized! + // (e.g. do not call this from process_init as that may run before CRT initialization) + mi_add_stderr_output(); // now it safe to use stderr for output + for(int i = 0; i < _mi_option_last; i++ ) { + mi_option_t option = (mi_option_t)i; + long l = mi_option_get(option); MI_UNUSED(l); // initialize + if (option != mi_option_verbose) { + mi_option_desc_t* desc = &options[option]; + _mi_verbose_message("option '%s': %ld\n", desc->name, desc->value); + } + } + mi_max_error_count = mi_option_get(mi_option_max_errors); + mi_max_warning_count = mi_option_get(mi_option_max_warnings); +} + +mi_decl_nodiscard long mi_option_get(mi_option_t option) { + mi_assert(option >= 0 && option < _mi_option_last); + if (option < 0 || option >= _mi_option_last) return 0; + mi_option_desc_t* desc = &options[option]; + mi_assert(desc->option == option); // index should match the option + if (mi_unlikely(desc->init == UNINIT)) { + mi_option_init(desc); + } + return desc->value; +} + +mi_decl_nodiscard long mi_option_get_clamp(mi_option_t option, long min, long max) { + long x = mi_option_get(option); + return (x < min ? min : (x > max ? max : x)); +} + +void mi_option_set(mi_option_t option, long value) { + mi_assert(option >= 0 && option < _mi_option_last); + if (option < 0 || option >= _mi_option_last) return; + mi_option_desc_t* desc = &options[option]; + mi_assert(desc->option == option); // index should match the option + desc->value = value; + desc->init = INITIALIZED; +} + +void mi_option_set_default(mi_option_t option, long value) { + mi_assert(option >= 0 && option < _mi_option_last); + if (option < 0 || option >= _mi_option_last) return; + mi_option_desc_t* desc = &options[option]; + if (desc->init != INITIALIZED) { + desc->value = value; + } +} + +mi_decl_nodiscard bool mi_option_is_enabled(mi_option_t option) { + return (mi_option_get(option) != 0); +} + +void mi_option_set_enabled(mi_option_t option, bool enable) { + mi_option_set(option, (enable ? 1 : 0)); +} + +void mi_option_set_enabled_default(mi_option_t option, bool enable) { + mi_option_set_default(option, (enable ? 1 : 0)); +} + +void mi_option_enable(mi_option_t option) { + mi_option_set_enabled(option,true); +} + +void mi_option_disable(mi_option_t option) { + mi_option_set_enabled(option,false); +} + + +static void mi_out_stderr(const char* msg, void* arg) { + MI_UNUSED(arg); + if (msg == NULL) return; + #ifdef _WIN32 + // on windows with redirection, the C runtime cannot handle locale dependent output + // after the main thread closes so we use direct console output. + if (!_mi_preloading()) { + // _cputs(msg); // _cputs cannot be used at is aborts if it fails to lock the console + static HANDLE hcon = INVALID_HANDLE_VALUE; + if (hcon == INVALID_HANDLE_VALUE) { + hcon = GetStdHandle(STD_ERROR_HANDLE); + } + const size_t len = strlen(msg); + if (hcon != INVALID_HANDLE_VALUE && len > 0 && len < UINT32_MAX) { + DWORD written = 0; + WriteConsoleA(hcon, msg, (DWORD)len, &written, NULL); + } + } + #else + fputs(msg, stderr); + #endif +} + +// Since an output function can be registered earliest in the `main` +// function we also buffer output that happens earlier. When +// an output function is registered it is called immediately with +// the output up to that point. +#ifndef MI_MAX_DELAY_OUTPUT +#define MI_MAX_DELAY_OUTPUT ((size_t)(32*1024)) +#endif +static char out_buf[MI_MAX_DELAY_OUTPUT+1]; +static _Atomic(size_t) out_len; + +static void mi_out_buf(const char* msg, void* arg) { + MI_UNUSED(arg); + if (msg==NULL) return; + if (mi_atomic_load_relaxed(&out_len)>=MI_MAX_DELAY_OUTPUT) return; + size_t n = strlen(msg); + if (n==0) return; + // claim space + size_t start = mi_atomic_add_acq_rel(&out_len, n); + if (start >= MI_MAX_DELAY_OUTPUT) return; + // check bound + if (start+n >= MI_MAX_DELAY_OUTPUT) { + n = MI_MAX_DELAY_OUTPUT-start-1; + } + _mi_memcpy(&out_buf[start], msg, n); +} + +static void mi_out_buf_flush(mi_output_fun* out, bool no_more_buf, void* arg) { + if (out==NULL) return; + // claim (if `no_more_buf == true`, no more output will be added after this point) + size_t count = mi_atomic_add_acq_rel(&out_len, (no_more_buf ? MI_MAX_DELAY_OUTPUT : 1)); + // and output the current contents + if (count>MI_MAX_DELAY_OUTPUT) count = MI_MAX_DELAY_OUTPUT; + out_buf[count] = 0; + out(out_buf,arg); + if (!no_more_buf) { + out_buf[count] = '\n'; // if continue with the buffer, insert a newline + } +} + + +// Once this module is loaded, switch to this routine +// which outputs to stderr and the delayed output buffer. +static void mi_out_buf_stderr(const char* msg, void* arg) { + mi_out_stderr(msg,arg); + mi_out_buf(msg,arg); +} + + + +// -------------------------------------------------------- +// Default output handler +// -------------------------------------------------------- + +// Should be atomic but gives errors on many platforms as generally we cannot cast a function pointer to a uintptr_t. +// For now, don't register output from multiple threads. +static mi_output_fun* volatile mi_out_default; // = NULL +static _Atomic(void*) mi_out_arg; // = NULL + +static mi_output_fun* mi_out_get_default(void** parg) { + if (parg != NULL) { *parg = mi_atomic_load_ptr_acquire(void,&mi_out_arg); } + mi_output_fun* out = mi_out_default; + return (out == NULL ? &mi_out_buf : out); +} + +void mi_register_output(mi_output_fun* out, void* arg) mi_attr_noexcept { + mi_out_default = (out == NULL ? &mi_out_stderr : out); // stop using the delayed output buffer + mi_atomic_store_ptr_release(void,&mi_out_arg, arg); + if (out!=NULL) mi_out_buf_flush(out,true,arg); // output all the delayed output now +} + +// add stderr to the delayed output after the module is loaded +static void mi_add_stderr_output() { + mi_assert_internal(mi_out_default == NULL); + mi_out_buf_flush(&mi_out_stderr, false, NULL); // flush current contents to stderr + mi_out_default = &mi_out_buf_stderr; // and add stderr to the delayed output +} + +// -------------------------------------------------------- +// Messages, all end up calling `_mi_fputs`. +// -------------------------------------------------------- +static _Atomic(size_t) error_count; // = 0; // when >= max_error_count stop emitting errors +static _Atomic(size_t) warning_count; // = 0; // when >= max_warning_count stop emitting warnings + +// When overriding malloc, we may recurse into mi_vfprintf if an allocation +// inside the C runtime causes another message. +// In some cases (like on macOS) the loader already allocates which +// calls into mimalloc; if we then access thread locals (like `recurse`) +// this may crash as the access may call _tlv_bootstrap that tries to +// (recursively) invoke malloc again to allocate space for the thread local +// variables on demand. This is why we use a _mi_preloading test on such +// platforms. However, C code generator may move the initial thread local address +// load before the `if` and we therefore split it out in a separate funcion. +static mi_decl_thread bool recurse = false; + +static mi_decl_noinline bool mi_recurse_enter_prim(void) { + if (recurse) return false; + recurse = true; + return true; +} + +static mi_decl_noinline void mi_recurse_exit_prim(void) { + recurse = false; +} + +static bool mi_recurse_enter(void) { + #if defined(__APPLE__) || defined(MI_TLS_RECURSE_GUARD) + if (_mi_preloading()) return true; + #endif + return mi_recurse_enter_prim(); +} + +static void mi_recurse_exit(void) { + #if defined(__APPLE__) || defined(MI_TLS_RECURSE_GUARD) + if (_mi_preloading()) return; + #endif + mi_recurse_exit_prim(); +} + +void _mi_fputs(mi_output_fun* out, void* arg, const char* prefix, const char* message) { + if (out==NULL || (FILE*)out==stdout || (FILE*)out==stderr) { // TODO: use mi_out_stderr for stderr? + if (!mi_recurse_enter()) return; + out = mi_out_get_default(&arg); + if (prefix != NULL) out(prefix, arg); + out(message, arg); + mi_recurse_exit(); + } + else { + if (prefix != NULL) out(prefix, arg); + out(message, arg); + } +} + +// Define our own limited `fprintf` that avoids memory allocation. +// We do this using `snprintf` with a limited buffer. +static void mi_vfprintf( mi_output_fun* out, void* arg, const char* prefix, const char* fmt, va_list args ) { + char buf[512]; + if (fmt==NULL) return; + if (!mi_recurse_enter()) return; + vsnprintf(buf,sizeof(buf)-1,fmt,args); + mi_recurse_exit(); + _mi_fputs(out,arg,prefix,buf); +} + +void _mi_fprintf( mi_output_fun* out, void* arg, const char* fmt, ... ) { + va_list args; + va_start(args,fmt); + mi_vfprintf(out,arg,NULL,fmt,args); + va_end(args); +} + +static void mi_vfprintf_thread(mi_output_fun* out, void* arg, const char* prefix, const char* fmt, va_list args) { + if (prefix != NULL && strlen(prefix) <= 32 && !_mi_is_main_thread()) { + char tprefix[64]; + snprintf(tprefix, sizeof(tprefix), "%sthread 0x%zx: ", prefix, _mi_thread_id()); + mi_vfprintf(out, arg, tprefix, fmt, args); + } + else { + mi_vfprintf(out, arg, prefix, fmt, args); + } +} + +void _mi_trace_message(const char* fmt, ...) { + if (mi_option_get(mi_option_verbose) <= 1) return; // only with verbose level 2 or higher + va_list args; + va_start(args, fmt); + mi_vfprintf_thread(NULL, NULL, "mimalloc: ", fmt, args); + va_end(args); +} + +void _mi_verbose_message(const char* fmt, ...) { + if (!mi_option_is_enabled(mi_option_verbose)) return; + va_list args; + va_start(args,fmt); + mi_vfprintf(NULL, NULL, "mimalloc: ", fmt, args); + va_end(args); +} + +static void mi_show_error_message(const char* fmt, va_list args) { + if (!mi_option_is_enabled(mi_option_verbose)) { + if (!mi_option_is_enabled(mi_option_show_errors)) return; + if (mi_max_error_count >= 0 && (long)mi_atomic_increment_acq_rel(&error_count) > mi_max_error_count) return; + } + mi_vfprintf_thread(NULL, NULL, "mimalloc: error: ", fmt, args); +} + +void _mi_warning_message(const char* fmt, ...) { + if (!mi_option_is_enabled(mi_option_verbose)) { + if (!mi_option_is_enabled(mi_option_show_errors)) return; + if (mi_max_warning_count >= 0 && (long)mi_atomic_increment_acq_rel(&warning_count) > mi_max_warning_count) return; + } + va_list args; + va_start(args,fmt); + mi_vfprintf_thread(NULL, NULL, "mimalloc: warning: ", fmt, args); + va_end(args); +} + + +#if MI_DEBUG +void _mi_assert_fail(const char* assertion, const char* fname, unsigned line, const char* func ) { + _mi_fprintf(NULL, NULL, "mimalloc: assertion failed: at \"%s\":%u, %s\n assertion: \"%s\"\n", fname, line, (func==NULL?"":func), assertion); + abort(); +} +#endif + +// -------------------------------------------------------- +// Errors +// -------------------------------------------------------- + +static mi_error_fun* volatile mi_error_handler; // = NULL +static _Atomic(void*) mi_error_arg; // = NULL + +static void mi_error_default(int err) { + MI_UNUSED(err); +#if (MI_DEBUG>0) + if (err==EFAULT) { + #ifdef _MSC_VER + __debugbreak(); + #endif + abort(); + } +#endif +#if (MI_SECURE>0) + if (err==EFAULT) { // abort on serious errors in secure mode (corrupted meta-data) + abort(); + } +#endif +#if defined(MI_XMALLOC) + if (err==ENOMEM || err==EOVERFLOW) { // abort on memory allocation fails in xmalloc mode + abort(); + } +#endif +} + +void mi_register_error(mi_error_fun* fun, void* arg) { + mi_error_handler = fun; // can be NULL + mi_atomic_store_ptr_release(void,&mi_error_arg, arg); +} + +void _mi_error_message(int err, const char* fmt, ...) { + // show detailed error message + va_list args; + va_start(args, fmt); + mi_show_error_message(fmt, args); + va_end(args); + // and call the error handler which may abort (or return normally) + if (mi_error_handler != NULL) { + mi_error_handler(err, mi_atomic_load_ptr_acquire(void,&mi_error_arg)); + } + else { + mi_error_default(err); + } +} + +// -------------------------------------------------------- +// Initialize options by checking the environment +// -------------------------------------------------------- + +static void mi_strlcpy(char* dest, const char* src, size_t dest_size) { + if (dest==NULL || src==NULL || dest_size == 0) return; + // copy until end of src, or when dest is (almost) full + while (*src != 0 && dest_size > 1) { + *dest++ = *src++; + dest_size--; + } + // always zero terminate + *dest = 0; +} + +static void mi_strlcat(char* dest, const char* src, size_t dest_size) { + if (dest==NULL || src==NULL || dest_size == 0) return; + // find end of string in the dest buffer + while (*dest != 0 && dest_size > 1) { + dest++; + dest_size--; + } + // and catenate + mi_strlcpy(dest, src, dest_size); +} + +#ifdef MI_NO_GETENV +static bool mi_getenv(const char* name, char* result, size_t result_size) { + MI_UNUSED(name); + MI_UNUSED(result); + MI_UNUSED(result_size); + return false; +} +#else +static inline int mi_strnicmp(const char* s, const char* t, size_t n) { + if (n==0) return 0; + for (; *s != 0 && *t != 0 && n > 0; s++, t++, n--) { + if (toupper(*s) != toupper(*t)) break; + } + return (n==0 ? 0 : *s - *t); +} +#if defined _WIN32 +// On Windows use GetEnvironmentVariable instead of getenv to work +// reliably even when this is invoked before the C runtime is initialized. +// i.e. when `_mi_preloading() == true`. +// Note: on windows, environment names are not case sensitive. +#include +static bool mi_getenv(const char* name, char* result, size_t result_size) { + result[0] = 0; + size_t len = GetEnvironmentVariableA(name, result, (DWORD)result_size); + return (len > 0 && len < result_size); +} +#elif !defined(MI_USE_ENVIRON) || (MI_USE_ENVIRON!=0) +// On Posix systemsr use `environ` to acces environment variables +// even before the C runtime is initialized. +#if defined(__APPLE__) && defined(__has_include) && __has_include() +#include +static char** mi_get_environ(void) { + return (*_NSGetEnviron()); +} +#else +extern char** environ; +static char** mi_get_environ(void) { + return environ; +} +#endif +static bool mi_getenv(const char* name, char* result, size_t result_size) { + if (name==NULL) return false; + const size_t len = strlen(name); + if (len == 0) return false; + char** env = mi_get_environ(); + if (env == NULL) return false; + // compare up to 256 entries + for (int i = 0; i < 256 && env[i] != NULL; i++) { + const char* s = env[i]; + if (mi_strnicmp(name, s, len) == 0 && s[len] == '=') { // case insensitive + // found it + mi_strlcpy(result, s + len + 1, result_size); + return true; + } + } + return false; +} +#else +// fallback: use standard C `getenv` but this cannot be used while initializing the C runtime +static bool mi_getenv(const char* name, char* result, size_t result_size) { + // cannot call getenv() when still initializing the C runtime. + if (_mi_preloading()) return false; + const char* s = getenv(name); + if (s == NULL) { + // we check the upper case name too. + char buf[64+1]; + size_t len = strlen(name); + if (len >= sizeof(buf)) len = sizeof(buf) - 1; + for (size_t i = 0; i < len; i++) { + buf[i] = toupper(name[i]); + } + buf[len] = 0; + s = getenv(buf); + } + if (s != NULL && strlen(s) < result_size) { + mi_strlcpy(result, s, result_size); + return true; + } + else { + return false; + } +} +#endif // !MI_USE_ENVIRON +#endif // !MI_NO_GETENV + +static void mi_option_init(mi_option_desc_t* desc) { + // Read option value from the environment + char s[64+1]; + char buf[64+1]; + mi_strlcpy(buf, "mimalloc_", sizeof(buf)); + mi_strlcat(buf, desc->name, sizeof(buf)); + bool found = mi_getenv(buf,s,sizeof(s)); + if (!found && desc->legacy_name != NULL) { + mi_strlcpy(buf, "mimalloc_", sizeof(buf)); + mi_strlcat(buf, desc->legacy_name, sizeof(buf)); + found = mi_getenv(buf,s,sizeof(s)); + if (found) { + _mi_warning_message("environment option \"mimalloc_%s\" is deprecated -- use \"mimalloc_%s\" instead.\n", desc->legacy_name, desc->name ); + } + } + + if (found) { + size_t len = strlen(s); + if (len >= sizeof(buf)) len = sizeof(buf) - 1; + for (size_t i = 0; i < len; i++) { + buf[i] = (char)toupper(s[i]); + } + buf[len] = 0; + if (buf[0]==0 || strstr("1;TRUE;YES;ON", buf) != NULL) { + desc->value = 1; + desc->init = INITIALIZED; + } + else if (strstr("0;FALSE;NO;OFF", buf) != NULL) { + desc->value = 0; + desc->init = INITIALIZED; + } + else { + char* end = buf; + long value = strtol(buf, &end, 10); + if (desc->option == mi_option_reserve_os_memory) { + // this option is interpreted in KiB to prevent overflow of `long` + if (*end == 'K') { end++; } + else if (*end == 'M') { value *= MI_KiB; end++; } + else if (*end == 'G') { value *= MI_MiB; end++; } + else { value = (value + MI_KiB - 1) / MI_KiB; } + if (end[0] == 'I' && end[1] == 'B') { end += 2; } + else if (*end == 'B') { end++; } + } + if (*end == 0) { + desc->value = value; + desc->init = INITIALIZED; + } + else { + // set `init` first to avoid recursion through _mi_warning_message on mimalloc_verbose. + desc->init = DEFAULTED; + if (desc->option == mi_option_verbose && desc->value == 0) { + // if the 'mimalloc_verbose' env var has a bogus value we'd never know + // (since the value defaults to 'off') so in that case briefly enable verbose + desc->value = 1; + _mi_warning_message("environment option mimalloc_%s has an invalid value.\n", desc->name ); + desc->value = 0; + } + else { + _mi_warning_message("environment option mimalloc_%s has an invalid value.\n", desc->name ); + } + } + } + mi_assert_internal(desc->init != UNINIT); + } + else if (!_mi_preloading()) { + desc->init = DEFAULTED; + } +} diff --git a/compat/mimalloc/os.c b/compat/mimalloc/os.c new file mode 100644 index 00000000000000..8bb236d92a2dbd --- /dev/null +++ b/compat/mimalloc/os.c @@ -0,0 +1,1443 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#ifndef _DEFAULT_SOURCE +#define _DEFAULT_SOURCE // ensure mmap flags are defined +#endif + +#if defined(__sun) +// illumos provides new mman.h api when any of these are defined +// otherwise the old api based on caddr_t which predates the void pointers one. +// stock solaris provides only the former, chose to atomically to discard those +// flags only here rather than project wide tough. +#undef _XOPEN_SOURCE +#undef _POSIX_C_SOURCE +#endif +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include // strerror + +#ifdef _MSC_VER +#pragma warning(disable:4996) // strerror +#endif + +#if defined(__wasi__) +#define MI_USE_SBRK +#endif + +#if defined(_WIN32) +#include +#elif defined(__wasi__) +#include // sbrk +#else +#include // mmap +#include // sysconf +#if defined(__linux__) +#include +#include +#if defined(__GLIBC__) +#include // linux mmap flags +#else +#include +#endif +#endif +#if defined(__APPLE__) +#include +#if !TARGET_IOS_IPHONE && !TARGET_IOS_SIMULATOR +#include +#endif +#endif +#if defined(__FreeBSD__) || defined(__DragonFly__) +#include +#if __FreeBSD_version >= 1200000 +#include +#include +#endif +#include +#endif +#endif + +/* ----------------------------------------------------------- + Initialization. + On windows initializes support for aligned allocation and + large OS pages (if MIMALLOC_LARGE_OS_PAGES is true). +----------------------------------------------------------- */ +bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* stats); +bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats); + +static void* mi_align_up_ptr(void* p, size_t alignment) { + return (void*)_mi_align_up((uintptr_t)p, alignment); +} + +static void* mi_align_down_ptr(void* p, size_t alignment) { + return (void*)_mi_align_down((uintptr_t)p, alignment); +} + + +// page size (initialized properly in `os_init`) +static size_t os_page_size = 4096; + +// minimal allocation granularity +static size_t os_alloc_granularity = 4096; + +// if non-zero, use large page allocation +static size_t large_os_page_size = 0; + +// is memory overcommit allowed? +// set dynamically in _mi_os_init (and if true we use MAP_NORESERVE) +static bool os_overcommit = true; + +bool _mi_os_has_overcommit(void) { + return os_overcommit; +} + +// OS (small) page size +size_t _mi_os_page_size(void) { + return os_page_size; +} + +// if large OS pages are supported (2 or 4MiB), then return the size, otherwise return the small page size (4KiB) +size_t _mi_os_large_page_size(void) { + return (large_os_page_size != 0 ? large_os_page_size : _mi_os_page_size()); +} + +#if !defined(MI_USE_SBRK) && !defined(__wasi__) +static bool use_large_os_page(size_t size, size_t alignment) { + // if we have access, check the size and alignment requirements + if (large_os_page_size == 0 || !mi_option_is_enabled(mi_option_large_os_pages)) return false; + return ((size % large_os_page_size) == 0 && (alignment % large_os_page_size) == 0); +} +#endif + +// round to a good OS allocation size (bounded by max 12.5% waste) +size_t _mi_os_good_alloc_size(size_t size) { + size_t align_size; + if (size < 512*MI_KiB) align_size = _mi_os_page_size(); + else if (size < 2*MI_MiB) align_size = 64*MI_KiB; + else if (size < 8*MI_MiB) align_size = 256*MI_KiB; + else if (size < 32*MI_MiB) align_size = 1*MI_MiB; + else align_size = 4*MI_MiB; + if (mi_unlikely(size >= (SIZE_MAX - align_size))) return size; // possible overflow? + return _mi_align_up(size, align_size); +} + +#if defined(_WIN32) +// We use VirtualAlloc2 for aligned allocation, but it is only supported on Windows 10 and Windows Server 2016. +// So, we need to look it up dynamically to run on older systems. (use __stdcall for 32-bit compatibility) +// NtAllocateVirtualAllocEx is used for huge OS page allocation (1GiB) +// We define a minimal MEM_EXTENDED_PARAMETER ourselves in order to be able to compile with older SDK's. +typedef enum MI_MEM_EXTENDED_PARAMETER_TYPE_E { + MiMemExtendedParameterInvalidType = 0, + MiMemExtendedParameterAddressRequirements, + MiMemExtendedParameterNumaNode, + MiMemExtendedParameterPartitionHandle, + MiMemExtendedParameterUserPhysicalHandle, + MiMemExtendedParameterAttributeFlags, + MiMemExtendedParameterMax +} MI_MEM_EXTENDED_PARAMETER_TYPE; + +typedef struct DECLSPEC_ALIGN(8) MI_MEM_EXTENDED_PARAMETER_S { + struct { DWORD64 Type : 8; DWORD64 Reserved : 56; } Type; + union { DWORD64 ULong64; PVOID Pointer; SIZE_T Size; HANDLE Handle; DWORD ULong; } Arg; +} MI_MEM_EXTENDED_PARAMETER; + +typedef struct MI_MEM_ADDRESS_REQUIREMENTS_S { + PVOID LowestStartingAddress; + PVOID HighestEndingAddress; + SIZE_T Alignment; +} MI_MEM_ADDRESS_REQUIREMENTS; + +#define MI_MEM_EXTENDED_PARAMETER_NONPAGED_HUGE 0x00000010 + +#include +typedef PVOID (__stdcall *PVirtualAlloc2)(HANDLE, PVOID, SIZE_T, ULONG, ULONG, MI_MEM_EXTENDED_PARAMETER*, ULONG); +typedef NTSTATUS (__stdcall *PNtAllocateVirtualMemoryEx)(HANDLE, PVOID*, SIZE_T*, ULONG, ULONG, MI_MEM_EXTENDED_PARAMETER*, ULONG); +static PVirtualAlloc2 pVirtualAlloc2 = NULL; +static PNtAllocateVirtualMemoryEx pNtAllocateVirtualMemoryEx = NULL; + +// Similarly, GetNumaProcesorNodeEx is only supported since Windows 7 +typedef struct MI_PROCESSOR_NUMBER_S { WORD Group; BYTE Number; BYTE Reserved; } MI_PROCESSOR_NUMBER; + +typedef VOID (__stdcall *PGetCurrentProcessorNumberEx)(MI_PROCESSOR_NUMBER* ProcNumber); +typedef BOOL (__stdcall *PGetNumaProcessorNodeEx)(MI_PROCESSOR_NUMBER* Processor, PUSHORT NodeNumber); +typedef BOOL (__stdcall* PGetNumaNodeProcessorMaskEx)(USHORT Node, PGROUP_AFFINITY ProcessorMask); +static PGetCurrentProcessorNumberEx pGetCurrentProcessorNumberEx = NULL; +static PGetNumaProcessorNodeEx pGetNumaProcessorNodeEx = NULL; +static PGetNumaNodeProcessorMaskEx pGetNumaNodeProcessorMaskEx = NULL; + +static bool mi_win_enable_large_os_pages(void) +{ + if (large_os_page_size > 0) return true; + + // Try to see if large OS pages are supported + // To use large pages on Windows, we first need access permission + // Set "Lock pages in memory" permission in the group policy editor + // + unsigned long err = 0; + HANDLE token = NULL; + BOOL ok = OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &token); + if (ok) { + TOKEN_PRIVILEGES tp; + ok = LookupPrivilegeValue(NULL, TEXT("SeLockMemoryPrivilege"), &tp.Privileges[0].Luid); + if (ok) { + tp.PrivilegeCount = 1; + tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; + ok = AdjustTokenPrivileges(token, FALSE, &tp, 0, (PTOKEN_PRIVILEGES)NULL, 0); + if (ok) { + err = GetLastError(); + ok = (err == ERROR_SUCCESS); + if (ok) { + large_os_page_size = GetLargePageMinimum(); + } + } + } + CloseHandle(token); + } + if (!ok) { + if (err == 0) err = GetLastError(); + _mi_warning_message("cannot enable large OS page support, error %lu\n", err); + } + return (ok!=0); +} + +void _mi_os_init(void) +{ + os_overcommit = false; + // get the page size + SYSTEM_INFO si; + GetSystemInfo(&si); + if (si.dwPageSize > 0) os_page_size = si.dwPageSize; + if (si.dwAllocationGranularity > 0) os_alloc_granularity = si.dwAllocationGranularity; + // get the VirtualAlloc2 function + HINSTANCE hDll; + hDll = LoadLibrary(TEXT("kernelbase.dll")); + if (hDll != NULL) { + // use VirtualAlloc2FromApp if possible as it is available to Windows store apps + pVirtualAlloc2 = (PVirtualAlloc2)(void (*)(void))GetProcAddress(hDll, "VirtualAlloc2FromApp"); + if (pVirtualAlloc2==NULL) pVirtualAlloc2 = (PVirtualAlloc2)(void (*)(void))GetProcAddress(hDll, "VirtualAlloc2"); + FreeLibrary(hDll); + } + // NtAllocateVirtualMemoryEx is used for huge page allocation + hDll = LoadLibrary(TEXT("ntdll.dll")); + if (hDll != NULL) { + pNtAllocateVirtualMemoryEx = (PNtAllocateVirtualMemoryEx)(void (*)(void))GetProcAddress(hDll, "NtAllocateVirtualMemoryEx"); + FreeLibrary(hDll); + } + // Try to use Win7+ numa API + hDll = LoadLibrary(TEXT("kernel32.dll")); + if (hDll != NULL) { + pGetCurrentProcessorNumberEx = (PGetCurrentProcessorNumberEx)(void (*)(void))GetProcAddress(hDll, "GetCurrentProcessorNumberEx"); + pGetNumaProcessorNodeEx = (PGetNumaProcessorNodeEx)(void (*)(void))GetProcAddress(hDll, "GetNumaProcessorNodeEx"); + pGetNumaNodeProcessorMaskEx = (PGetNumaNodeProcessorMaskEx)(void (*)(void))GetProcAddress(hDll, "GetNumaNodeProcessorMaskEx"); + FreeLibrary(hDll); + } + if (mi_option_is_enabled(mi_option_large_os_pages) || mi_option_is_enabled(mi_option_reserve_huge_os_pages)) { + mi_win_enable_large_os_pages(); + } +} +#elif defined(__wasi__) +void _mi_os_init(void) { + os_overcommit = false; + os_page_size = 64*MI_KiB; // WebAssembly has a fixed page size: 64KiB + os_alloc_granularity = 16; +} + +#else // generic unix + +static void os_detect_overcommit(void) { +#if defined(__linux__) + int fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY); + if (fd < 0) return; + char buf[32]; + ssize_t nread = read(fd, &buf, sizeof(buf)); + close(fd); + // + // 0: heuristic overcommit, 1: always overcommit, 2: never overcommit (ignore NORESERVE) + if (nread >= 1) { + os_overcommit = (buf[0] == '0' || buf[0] == '1'); + } +#elif defined(__FreeBSD__) + int val = 0; + size_t olen = sizeof(val); + if (sysctlbyname("vm.overcommit", &val, &olen, NULL, 0) == 0) { + os_overcommit = (val != 0); + } +#else + // default: overcommit is true +#endif +} + +void _mi_os_init(void) { + // get the page size + long result = sysconf(_SC_PAGESIZE); + if (result > 0) { + os_page_size = (size_t)result; + os_alloc_granularity = os_page_size; + } + large_os_page_size = 2*MI_MiB; // TODO: can we query the OS for this? + os_detect_overcommit(); +} +#endif + + +#if defined(MADV_NORMAL) +static int mi_madvise(void* addr, size_t length, int advice) { + #if defined(__sun) + return madvise((caddr_t)addr, length, advice); // Solaris needs cast (issue #520) + #else + return madvise(addr, length, advice); + #endif +} +#endif + + +/* ----------------------------------------------------------- + aligned hinting +-------------------------------------------------------------- */ + +// On 64-bit systems, we can do efficient aligned allocation by using +// the 2TiB to 30TiB area to allocate those. +#if (MI_INTPTR_SIZE >= 8) +static mi_decl_cache_align _Atomic(uintptr_t)aligned_base; + +// Return a MI_SEGMENT_SIZE aligned address that is probably available. +// If this returns NULL, the OS will determine the address but on some OS's that may not be +// properly aligned which can be more costly as it needs to be adjusted afterwards. +// For a size > 1GiB this always returns NULL in order to guarantee good ASLR randomization; +// (otherwise an initial large allocation of say 2TiB has a 50% chance to include (known) addresses +// in the middle of the 2TiB - 6TiB address range (see issue #372)) + +#define MI_HINT_BASE ((uintptr_t)2 << 40) // 2TiB start +#define MI_HINT_AREA ((uintptr_t)4 << 40) // upto 6TiB (since before win8 there is "only" 8TiB available to processes) +#define MI_HINT_MAX ((uintptr_t)30 << 40) // wrap after 30TiB (area after 32TiB is used for huge OS pages) + +static void* mi_os_get_aligned_hint(size_t try_alignment, size_t size) +{ + if (try_alignment <= 1 || try_alignment > MI_SEGMENT_SIZE) return NULL; + size = _mi_align_up(size, MI_SEGMENT_SIZE); + if (size > 1*MI_GiB) return NULL; // guarantee the chance of fixed valid address is at most 1/(MI_HINT_AREA / 1<<30) = 1/4096. + #if (MI_SECURE>0) + size += MI_SEGMENT_SIZE; // put in `MI_SEGMENT_SIZE` virtual gaps between hinted blocks; this splits VLA's but increases guarded areas. + #endif + + uintptr_t hint = mi_atomic_add_acq_rel(&aligned_base, size); + if (hint == 0 || hint > MI_HINT_MAX) { // wrap or initialize + uintptr_t init = MI_HINT_BASE; + #if (MI_SECURE>0 || MI_DEBUG==0) // security: randomize start of aligned allocations unless in debug mode + uintptr_t r = _mi_heap_random_next(mi_get_default_heap()); + init = init + ((MI_SEGMENT_SIZE * ((r>>17) & 0xFFFFF)) % MI_HINT_AREA); // (randomly 20 bits)*4MiB == 0 to 4TiB + #endif + uintptr_t expected = hint + size; + mi_atomic_cas_strong_acq_rel(&aligned_base, &expected, init); + hint = mi_atomic_add_acq_rel(&aligned_base, size); // this may still give 0 or > MI_HINT_MAX but that is ok, it is a hint after all + } + if (hint%try_alignment != 0) return NULL; + return (void*)hint; +} +#else +static void* mi_os_get_aligned_hint(size_t try_alignment, size_t size) { + MI_UNUSED(try_alignment); MI_UNUSED(size); + return NULL; +} +#endif + +/* ----------------------------------------------------------- + Free memory +-------------------------------------------------------------- */ + +static bool mi_os_mem_free(void* addr, size_t size, bool was_committed, mi_stats_t* stats) +{ + if (addr == NULL || size == 0) return true; // || _mi_os_is_huge_reserved(addr) + bool err = false; +#if defined(_WIN32) + DWORD errcode = 0; + err = (VirtualFree(addr, 0, MEM_RELEASE) == 0); + if (err) { errcode = GetLastError(); } + if (errcode == ERROR_INVALID_ADDRESS) { + // In mi_os_mem_alloc_aligned the fallback path may have returned a pointer inside + // the memory region returned by VirtualAlloc; in that case we need to free using + // the start of the region. + MEMORY_BASIC_INFORMATION info = { 0, 0 }; + VirtualQuery(addr, &info, sizeof(info)); + if (info.AllocationBase < addr && ((uint8_t*)addr - (uint8_t*)info.AllocationBase) < MI_SEGMENT_SIZE) { + errcode = 0; + err = (VirtualFree(info.AllocationBase, 0, MEM_RELEASE) == 0); + if (err) { errcode = GetLastError(); } + } + } + if (errcode != 0) { + _mi_warning_message("unable to release OS memory: error code 0x%x, addr: %p, size: %zu\n", errcode, addr, size); + } +#elif defined(MI_USE_SBRK) || defined(__wasi__) + err = false; // sbrk heap cannot be shrunk +#else + err = (munmap(addr, size) == -1); + if (err) { + _mi_warning_message("unable to release OS memory: %s, addr: %p, size: %zu\n", strerror(errno), addr, size); + } +#endif + if (was_committed) { _mi_stat_decrease(&stats->committed, size); } + _mi_stat_decrease(&stats->reserved, size); + return !err; +} + + +/* ----------------------------------------------------------- + Raw allocation on Windows (VirtualAlloc) +-------------------------------------------------------------- */ + +#ifdef _WIN32 + +#define MEM_COMMIT_RESERVE (MEM_COMMIT|MEM_RESERVE) + +static void* mi_win_virtual_allocx(void* addr, size_t size, size_t try_alignment, DWORD flags) { +#if (MI_INTPTR_SIZE >= 8) + // on 64-bit systems, try to use the virtual address area after 2TiB for 4MiB aligned allocations + if (addr == NULL) { + void* hint = mi_os_get_aligned_hint(try_alignment,size); + if (hint != NULL) { + void* p = VirtualAlloc(hint, size, flags, PAGE_READWRITE); + if (p != NULL) return p; + _mi_verbose_message("warning: unable to allocate hinted aligned OS memory (%zu bytes, error code: 0x%x, address: %p, alignment: %zu, flags: 0x%x)\n", size, GetLastError(), hint, try_alignment, flags); + // fall through on error + } + } +#endif + // on modern Windows try use VirtualAlloc2 for aligned allocation + if (try_alignment > 1 && (try_alignment % _mi_os_page_size()) == 0 && pVirtualAlloc2 != NULL) { + MI_MEM_ADDRESS_REQUIREMENTS reqs = { 0, 0, 0 }; + reqs.Alignment = try_alignment; + MI_MEM_EXTENDED_PARAMETER param = { {0, 0}, {0} }; + param.Type.Type = MiMemExtendedParameterAddressRequirements; + param.Arg.Pointer = &reqs; + void* p = (*pVirtualAlloc2)(GetCurrentProcess(), addr, size, flags, PAGE_READWRITE, ¶m, 1); + if (p != NULL) return p; + _mi_warning_message("unable to allocate aligned OS memory (%zu bytes, error code: 0x%x, address: %p, alignment: %zu, flags: 0x%x)\n", size, GetLastError(), addr, try_alignment, flags); + // fall through on error + } + // last resort + return VirtualAlloc(addr, size, flags, PAGE_READWRITE); +} + +static void* mi_win_virtual_alloc(void* addr, size_t size, size_t try_alignment, DWORD flags, bool large_only, bool allow_large, bool* is_large) { + mi_assert_internal(!(large_only && !allow_large)); + static _Atomic(size_t) large_page_try_ok; // = 0; + void* p = NULL; + // Try to allocate large OS pages (2MiB) if allowed or required. + if ((large_only || use_large_os_page(size, try_alignment)) + && allow_large && (flags&MEM_COMMIT)!=0 && (flags&MEM_RESERVE)!=0) { + size_t try_ok = mi_atomic_load_acquire(&large_page_try_ok); + if (!large_only && try_ok > 0) { + // if a large page allocation fails, it seems the calls to VirtualAlloc get very expensive. + // therefore, once a large page allocation failed, we don't try again for `large_page_try_ok` times. + mi_atomic_cas_strong_acq_rel(&large_page_try_ok, &try_ok, try_ok - 1); + } + else { + // large OS pages must always reserve and commit. + *is_large = true; + p = mi_win_virtual_allocx(addr, size, try_alignment, flags | MEM_LARGE_PAGES); + if (large_only) return p; + // fall back to non-large page allocation on error (`p == NULL`). + if (p == NULL) { + mi_atomic_store_release(&large_page_try_ok,10UL); // on error, don't try again for the next N allocations + } + } + } + // Fall back to regular page allocation + if (p == NULL) { + *is_large = ((flags&MEM_LARGE_PAGES) != 0); + p = mi_win_virtual_allocx(addr, size, try_alignment, flags); + } + if (p == NULL) { + _mi_warning_message("unable to allocate OS memory (%zu bytes, error code: 0x%x, address: %p, alignment: %zu, flags: 0x%x, large only: %d, allow large: %d)\n", size, GetLastError(), addr, try_alignment, flags, large_only, allow_large); + } + return p; +} + +/* ----------------------------------------------------------- + Raw allocation using `sbrk` or `wasm_memory_grow` +-------------------------------------------------------------- */ + +#elif defined(MI_USE_SBRK) || defined(__wasi__) +#if defined(MI_USE_SBRK) + static void* mi_memory_grow( size_t size ) { + void* p = sbrk(size); + if (p == (void*)(-1)) return NULL; + #if !defined(__wasi__) // on wasi this is always zero initialized already (?) + memset(p,0,size); + #endif + return p; + } +#elif defined(__wasi__) + static void* mi_memory_grow( size_t size ) { + size_t base = (size > 0 ? __builtin_wasm_memory_grow(0,_mi_divide_up(size, _mi_os_page_size())) + : __builtin_wasm_memory_size(0)); + if (base == SIZE_MAX) return NULL; + return (void*)(base * _mi_os_page_size()); + } +#endif + +#if defined(MI_USE_PTHREADS) +static pthread_mutex_t mi_heap_grow_mutex = PTHREAD_MUTEX_INITIALIZER; +#endif + +static void* mi_heap_grow(size_t size, size_t try_alignment) { + void* p = NULL; + if (try_alignment <= 1) { + // `sbrk` is not thread safe in general so try to protect it (we could skip this on WASM but leave it in for now) + #if defined(MI_USE_PTHREADS) + pthread_mutex_lock(&mi_heap_grow_mutex); + #endif + p = mi_memory_grow(size); + #if defined(MI_USE_PTHREADS) + pthread_mutex_unlock(&mi_heap_grow_mutex); + #endif + } + else { + void* base = NULL; + size_t alloc_size = 0; + // to allocate aligned use a lock to try to avoid thread interaction + // between getting the current size and actual allocation + // (also, `sbrk` is not thread safe in general) + #if defined(MI_USE_PTHREADS) + pthread_mutex_lock(&mi_heap_grow_mutex); + #endif + { + void* current = mi_memory_grow(0); // get current size + if (current != NULL) { + void* aligned_current = mi_align_up_ptr(current, try_alignment); // and align from there to minimize wasted space + alloc_size = _mi_align_up( ((uint8_t*)aligned_current - (uint8_t*)current) + size, _mi_os_page_size()); + base = mi_memory_grow(alloc_size); + } + } + #if defined(MI_USE_PTHREADS) + pthread_mutex_unlock(&mi_heap_grow_mutex); + #endif + if (base != NULL) { + p = mi_align_up_ptr(base, try_alignment); + if ((uint8_t*)p + size > (uint8_t*)base + alloc_size) { + // another thread used wasm_memory_grow/sbrk in-between and we do not have enough + // space after alignment. Give up (and waste the space as we cannot shrink :-( ) + // (in `mi_os_mem_alloc_aligned` this will fall back to overallocation to align) + p = NULL; + } + } + } + if (p == NULL) { + _mi_warning_message("unable to allocate sbrk/wasm_memory_grow OS memory (%zu bytes, %zu alignment)\n", size, try_alignment); + errno = ENOMEM; + return NULL; + } + mi_assert_internal( try_alignment == 0 || (uintptr_t)p % try_alignment == 0 ); + return p; +} + +/* ----------------------------------------------------------- + Raw allocation on Unix's (mmap) +-------------------------------------------------------------- */ +#else +#define MI_OS_USE_MMAP +static void* mi_unix_mmapx(void* addr, size_t size, size_t try_alignment, int protect_flags, int flags, int fd) { + MI_UNUSED(try_alignment); + #if defined(MAP_ALIGNED) // BSD + if (addr == NULL && try_alignment > 1 && (try_alignment % _mi_os_page_size()) == 0) { + size_t n = mi_bsr(try_alignment); + if (((size_t)1 << n) == try_alignment && n >= 12 && n <= 30) { // alignment is a power of 2 and 4096 <= alignment <= 1GiB + flags |= MAP_ALIGNED(n); + void* p = mmap(addr, size, protect_flags, flags | MAP_ALIGNED(n), fd, 0); + if (p!=MAP_FAILED) return p; + // fall back to regular mmap + } + } + #elif defined(MAP_ALIGN) // Solaris + if (addr == NULL && try_alignment > 1 && (try_alignment % _mi_os_page_size()) == 0) { + void* p = mmap((void*)try_alignment, size, protect_flags, flags | MAP_ALIGN, fd, 0); // addr parameter is the required alignment + if (p!=MAP_FAILED) return p; + // fall back to regular mmap + } + #endif + #if (MI_INTPTR_SIZE >= 8) && !defined(MAP_ALIGNED) + // on 64-bit systems, use the virtual address area after 2TiB for 4MiB aligned allocations + if (addr == NULL) { + void* hint = mi_os_get_aligned_hint(try_alignment, size); + if (hint != NULL) { + void* p = mmap(hint, size, protect_flags, flags, fd, 0); + if (p!=MAP_FAILED) return p; + // fall back to regular mmap + } + } + #endif + // regular mmap + void* p = mmap(addr, size, protect_flags, flags, fd, 0); + if (p!=MAP_FAILED) return p; + // failed to allocate + return NULL; +} + +static int mi_unix_mmap_fd(void) { +#if defined(VM_MAKE_TAG) + // macOS: tracking anonymous page with a specific ID. (All up to 98 are taken officially but LLVM sanitizers had taken 99) + int os_tag = (int)mi_option_get(mi_option_os_tag); + if (os_tag < 100 || os_tag > 255) os_tag = 100; + return VM_MAKE_TAG(os_tag); +#else + return -1; +#endif +} + +static void* mi_unix_mmap(void* addr, size_t size, size_t try_alignment, int protect_flags, bool large_only, bool allow_large, bool* is_large) { + void* p = NULL; + #if !defined(MAP_ANONYMOUS) + #define MAP_ANONYMOUS MAP_ANON + #endif + #if !defined(MAP_NORESERVE) + #define MAP_NORESERVE 0 + #endif + const int fd = mi_unix_mmap_fd(); + int flags = MAP_PRIVATE | MAP_ANONYMOUS; + if (_mi_os_has_overcommit()) { + flags |= MAP_NORESERVE; + } + #if defined(PROT_MAX) + protect_flags |= PROT_MAX(PROT_READ | PROT_WRITE); // BSD + #endif + // huge page allocation + if ((large_only || use_large_os_page(size, try_alignment)) && allow_large) { + static _Atomic(size_t) large_page_try_ok; // = 0; + size_t try_ok = mi_atomic_load_acquire(&large_page_try_ok); + if (!large_only && try_ok > 0) { + // If the OS is not configured for large OS pages, or the user does not have + // enough permission, the `mmap` will always fail (but it might also fail for other reasons). + // Therefore, once a large page allocation failed, we don't try again for `large_page_try_ok` times + // to avoid too many failing calls to mmap. + mi_atomic_cas_strong_acq_rel(&large_page_try_ok, &try_ok, try_ok - 1); + } + else { + int lflags = flags & ~MAP_NORESERVE; // using NORESERVE on huge pages seems to fail on Linux + int lfd = fd; + #ifdef MAP_ALIGNED_SUPER + lflags |= MAP_ALIGNED_SUPER; + #endif + #ifdef MAP_HUGETLB + lflags |= MAP_HUGETLB; + #endif + #ifdef MAP_HUGE_1GB + static bool mi_huge_pages_available = true; + if ((size % MI_GiB) == 0 && mi_huge_pages_available) { + lflags |= MAP_HUGE_1GB; + } + else + #endif + { + #ifdef MAP_HUGE_2MB + lflags |= MAP_HUGE_2MB; + #endif + } + #ifdef VM_FLAGS_SUPERPAGE_SIZE_2MB + lfd |= VM_FLAGS_SUPERPAGE_SIZE_2MB; + #endif + if (large_only || lflags != flags) { + // try large OS page allocation + *is_large = true; + p = mi_unix_mmapx(addr, size, try_alignment, protect_flags, lflags, lfd); + #ifdef MAP_HUGE_1GB + if (p == NULL && (lflags & MAP_HUGE_1GB) != 0) { + mi_huge_pages_available = false; // don't try huge 1GiB pages again + _mi_warning_message("unable to allocate huge (1GiB) page, trying large (2MiB) pages instead (error %i)\n", errno); + lflags = ((lflags & ~MAP_HUGE_1GB) | MAP_HUGE_2MB); + p = mi_unix_mmapx(addr, size, try_alignment, protect_flags, lflags, lfd); + } + #endif + if (large_only) return p; + if (p == NULL) { + mi_atomic_store_release(&large_page_try_ok, (size_t)8); // on error, don't try again for the next N allocations + } + } + } + } + // regular allocation + if (p == NULL) { + *is_large = false; + p = mi_unix_mmapx(addr, size, try_alignment, protect_flags, flags, fd); + if (p != NULL) { + #if defined(MADV_HUGEPAGE) + // Many Linux systems don't allow MAP_HUGETLB but they support instead + // transparent huge pages (THP). Generally, it is not required to call `madvise` with MADV_HUGE + // though since properly aligned allocations will already use large pages if available + // in that case -- in particular for our large regions (in `memory.c`). + // However, some systems only allow THP if called with explicit `madvise`, so + // when large OS pages are enabled for mimalloc, we call `madvise` anyways. + if (allow_large && use_large_os_page(size, try_alignment)) { + if (mi_madvise(p, size, MADV_HUGEPAGE) == 0) { + *is_large = true; // possibly + }; + } + #elif defined(__sun) + if (allow_large && use_large_os_page(size, try_alignment)) { + struct memcntl_mha cmd = {0}; + cmd.mha_pagesize = large_os_page_size; + cmd.mha_cmd = MHA_MAPSIZE_VA; + if (memcntl((caddr_t)p, size, MC_HAT_ADVISE, (caddr_t)&cmd, 0, 0) == 0) { + *is_large = true; + } + } + #endif + } + } + if (p == NULL) { + _mi_warning_message("unable to allocate OS memory (%zu bytes, error code: %i, address: %p, large only: %d, allow large: %d)\n", size, errno, addr, large_only, allow_large); + } + return p; +} +#endif + + +/* ----------------------------------------------------------- + Primitive allocation from the OS. +-------------------------------------------------------------- */ + +// Note: the `try_alignment` is just a hint and the returned pointer is not guaranteed to be aligned. +static void* mi_os_mem_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, mi_stats_t* stats) { + mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0); + if (size == 0) return NULL; + if (!commit) allow_large = false; + if (try_alignment == 0) try_alignment = 1; // avoid 0 to ensure there will be no divide by zero when aligning + + void* p = NULL; + /* + if (commit && allow_large) { + p = _mi_os_try_alloc_from_huge_reserved(size, try_alignment); + if (p != NULL) { + *is_large = true; + return p; + } + } + */ + + #if defined(_WIN32) + int flags = MEM_RESERVE; + if (commit) { flags |= MEM_COMMIT; } + p = mi_win_virtual_alloc(NULL, size, try_alignment, flags, false, allow_large, is_large); + #elif defined(MI_USE_SBRK) || defined(__wasi__) + MI_UNUSED(allow_large); + *is_large = false; + p = mi_heap_grow(size, try_alignment); + #else + int protect_flags = (commit ? (PROT_WRITE | PROT_READ) : PROT_NONE); + p = mi_unix_mmap(NULL, size, try_alignment, protect_flags, false, allow_large, is_large); + #endif + mi_stat_counter_increase(stats->mmap_calls, 1); + if (p != NULL) { + _mi_stat_increase(&stats->reserved, size); + if (commit) { _mi_stat_increase(&stats->committed, size); } + } + return p; +} + + +// Primitive aligned allocation from the OS. +// This function guarantees the allocated memory is aligned. +static void* mi_os_mem_alloc_aligned(size_t size, size_t alignment, bool commit, bool allow_large, bool* is_large, mi_stats_t* stats) { + mi_assert_internal(alignment >= _mi_os_page_size() && ((alignment & (alignment - 1)) == 0)); + mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0); + mi_assert_internal(is_large != NULL); + if (!commit) allow_large = false; + if (!(alignment >= _mi_os_page_size() && ((alignment & (alignment - 1)) == 0))) return NULL; + size = _mi_align_up(size, _mi_os_page_size()); + + // try first with a hint (this will be aligned directly on Win 10+ or BSD) + void* p = mi_os_mem_alloc(size, alignment, commit, allow_large, is_large, stats); + if (p == NULL) return NULL; + + // if not aligned, free it, overallocate, and unmap around it + if (((uintptr_t)p % alignment != 0)) { + mi_os_mem_free(p, size, commit, stats); + _mi_warning_message("unable to allocate aligned OS memory directly, fall back to over-allocation (%zu bytes, address: %p, alignment: %zu, commit: %d)\n", size, p, alignment, commit); + if (size >= (SIZE_MAX - alignment)) return NULL; // overflow + const size_t over_size = size + alignment; + +#if _WIN32 + // over-allocate uncommitted (virtual) memory + p = mi_os_mem_alloc(over_size, 0 /*alignment*/, false /* commit? */, false /* allow_large */, is_large, stats); + if (p == NULL) return NULL; + + // set p to the aligned part in the full region + // note: this is dangerous on Windows as VirtualFree needs the actual region pointer + // but in mi_os_mem_free we handle this (hopefully exceptional) situation. + p = mi_align_up_ptr(p, alignment); + + // explicitly commit only the aligned part + if (commit) { + _mi_os_commit(p, size, NULL, stats); + } +#else + // overallocate... + p = mi_os_mem_alloc(over_size, 1, commit, false, is_large, stats); + if (p == NULL) return NULL; + // and selectively unmap parts around the over-allocated area. (noop on sbrk) + void* aligned_p = mi_align_up_ptr(p, alignment); + size_t pre_size = (uint8_t*)aligned_p - (uint8_t*)p; + size_t mid_size = _mi_align_up(size, _mi_os_page_size()); + size_t post_size = over_size - pre_size - mid_size; + mi_assert_internal(pre_size < over_size && post_size < over_size && mid_size >= size); + if (pre_size > 0) mi_os_mem_free(p, pre_size, commit, stats); + if (post_size > 0) mi_os_mem_free((uint8_t*)aligned_p + mid_size, post_size, commit, stats); + // we can return the aligned pointer on `mmap` (and sbrk) systems + p = aligned_p; +#endif + } + + mi_assert_internal(p == NULL || (p != NULL && ((uintptr_t)p % alignment) == 0)); + return p; +} + + +/* ----------------------------------------------------------- + OS API: alloc, free, alloc_aligned +----------------------------------------------------------- */ + +void* _mi_os_alloc(size_t size, mi_stats_t* tld_stats) { + MI_UNUSED(tld_stats); + mi_stats_t* stats = &_mi_stats_main; + if (size == 0) return NULL; + size = _mi_os_good_alloc_size(size); + bool is_large = false; + return mi_os_mem_alloc(size, 0, true, false, &is_large, stats); +} + +void _mi_os_free_ex(void* p, size_t size, bool was_committed, mi_stats_t* tld_stats) { + MI_UNUSED(tld_stats); + mi_stats_t* stats = &_mi_stats_main; + if (size == 0 || p == NULL) return; + size = _mi_os_good_alloc_size(size); + mi_os_mem_free(p, size, was_committed, stats); +} + +void _mi_os_free(void* p, size_t size, mi_stats_t* stats) { + _mi_os_free_ex(p, size, true, stats); +} + +void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool* large, mi_stats_t* tld_stats) +{ + MI_UNUSED(&mi_os_get_aligned_hint); // suppress unused warnings + MI_UNUSED(tld_stats); + if (size == 0) return NULL; + size = _mi_os_good_alloc_size(size); + alignment = _mi_align_up(alignment, _mi_os_page_size()); + bool allow_large = false; + if (large != NULL) { + allow_large = *large; + *large = false; + } + return mi_os_mem_alloc_aligned(size, alignment, commit, allow_large, (large!=NULL?large:&allow_large), &_mi_stats_main /*tld->stats*/ ); +} + + + +/* ----------------------------------------------------------- + OS memory API: reset, commit, decommit, protect, unprotect. +----------------------------------------------------------- */ + + +// OS page align within a given area, either conservative (pages inside the area only), +// or not (straddling pages outside the area is possible) +static void* mi_os_page_align_areax(bool conservative, void* addr, size_t size, size_t* newsize) { + mi_assert(addr != NULL && size > 0); + if (newsize != NULL) *newsize = 0; + if (size == 0 || addr == NULL) return NULL; + + // page align conservatively within the range + void* start = (conservative ? mi_align_up_ptr(addr, _mi_os_page_size()) + : mi_align_down_ptr(addr, _mi_os_page_size())); + void* end = (conservative ? mi_align_down_ptr((uint8_t*)addr + size, _mi_os_page_size()) + : mi_align_up_ptr((uint8_t*)addr + size, _mi_os_page_size())); + ptrdiff_t diff = (uint8_t*)end - (uint8_t*)start; + if (diff <= 0) return NULL; + + mi_assert_internal((conservative && (size_t)diff <= size) || (!conservative && (size_t)diff >= size)); + if (newsize != NULL) *newsize = (size_t)diff; + return start; +} + +static void* mi_os_page_align_area_conservative(void* addr, size_t size, size_t* newsize) { + return mi_os_page_align_areax(true, addr, size, newsize); +} + +static void mi_mprotect_hint(int err) { +#if defined(MI_OS_USE_MMAP) && (MI_SECURE>=2) // guard page around every mimalloc page + if (err == ENOMEM) { + _mi_warning_message("the previous warning may have been caused by a low memory map limit.\n" + " On Linux this is controlled by the vm.max_map_count. For example:\n" + " > sudo sysctl -w vm.max_map_count=262144\n"); + } +#else + MI_UNUSED(err); +#endif +} + +// Commit/Decommit memory. +// Usually commit is aligned liberal, while decommit is aligned conservative. +// (but not for the reset version where we want commit to be conservative as well) +static bool mi_os_commitx(void* addr, size_t size, bool commit, bool conservative, bool* is_zero, mi_stats_t* stats) { + // page align in the range, commit liberally, decommit conservative + if (is_zero != NULL) { *is_zero = false; } + size_t csize; + void* start = mi_os_page_align_areax(conservative, addr, size, &csize); + if (csize == 0) return true; // || _mi_os_is_huge_reserved(addr)) + int err = 0; + if (commit) { + _mi_stat_increase(&stats->committed, size); // use size for precise commit vs. decommit + _mi_stat_counter_increase(&stats->commit_calls, 1); + } + else { + _mi_stat_decrease(&stats->committed, size); + } + + #if defined(_WIN32) + if (commit) { + // *is_zero = true; // note: if the memory was already committed, the call succeeds but the memory is not zero'd + void* p = VirtualAlloc(start, csize, MEM_COMMIT, PAGE_READWRITE); + err = (p == start ? 0 : GetLastError()); + } + else { + BOOL ok = VirtualFree(start, csize, MEM_DECOMMIT); + err = (ok ? 0 : GetLastError()); + } + #elif defined(__wasi__) + // WebAssembly guests can't control memory protection + #elif 0 && defined(MAP_FIXED) && !defined(__APPLE__) + // Linux: disabled for now as mmap fixed seems much more expensive than MADV_DONTNEED (and splits VMA's?) + if (commit) { + // commit: just change the protection + err = mprotect(start, csize, (PROT_READ | PROT_WRITE)); + if (err != 0) { err = errno; } + } + else { + // decommit: use mmap with MAP_FIXED to discard the existing memory (and reduce rss) + const int fd = mi_unix_mmap_fd(); + void* p = mmap(start, csize, PROT_NONE, (MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE), fd, 0); + if (p != start) { err = errno; } + } + #else + // Linux, macOSX and others. + if (commit) { + // commit: ensure we can access the area + err = mprotect(start, csize, (PROT_READ | PROT_WRITE)); + if (err != 0) { err = errno; } + } + else { + #if defined(MADV_DONTNEED) && MI_DEBUG == 0 && MI_SECURE == 0 + // decommit: use MADV_DONTNEED as it decreases rss immediately (unlike MADV_FREE) + // (on the other hand, MADV_FREE would be good enough.. it is just not reflected in the stats :-( ) + err = madvise(start, csize, MADV_DONTNEED); + #else + // decommit: just disable access (also used in debug and secure mode to trap on illegal access) + err = mprotect(start, csize, PROT_NONE); + if (err != 0) { err = errno; } + #endif + //#if defined(MADV_FREE_REUSE) + // while ((err = mi_madvise(start, csize, MADV_FREE_REUSE)) != 0 && errno == EAGAIN) { errno = 0; } + //#endif + } + #endif + if (err != 0) { + _mi_warning_message("%s error: start: %p, csize: 0x%zx, err: %i\n", commit ? "commit" : "decommit", start, csize, err); + mi_mprotect_hint(err); + } + mi_assert_internal(err == 0); + return (err == 0); +} + +bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats) { + MI_UNUSED(tld_stats); + mi_stats_t* stats = &_mi_stats_main; + return mi_os_commitx(addr, size, true, false /* liberal */, is_zero, stats); +} + +bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* tld_stats) { + MI_UNUSED(tld_stats); + mi_stats_t* stats = &_mi_stats_main; + bool is_zero; + return mi_os_commitx(addr, size, false, true /* conservative */, &is_zero, stats); +} + +/* +static bool mi_os_commit_unreset(void* addr, size_t size, bool* is_zero, mi_stats_t* stats) { + return mi_os_commitx(addr, size, true, true // conservative + , is_zero, stats); +} +*/ + +// Signal to the OS that the address range is no longer in use +// but may be used later again. This will release physical memory +// pages and reduce swapping while keeping the memory committed. +// We page align to a conservative area inside the range to reset. +static bool mi_os_resetx(void* addr, size_t size, bool reset, mi_stats_t* stats) { + // page align conservatively within the range + size_t csize; + void* start = mi_os_page_align_area_conservative(addr, size, &csize); + if (csize == 0) return true; // || _mi_os_is_huge_reserved(addr) + if (reset) _mi_stat_increase(&stats->reset, csize); + else _mi_stat_decrease(&stats->reset, csize); + if (!reset) return true; // nothing to do on unreset! + + #if (MI_DEBUG>1) + if (MI_SECURE==0) { + memset(start, 0, csize); // pretend it is eagerly reset + } + #endif + +#if defined(_WIN32) + // Testing shows that for us (on `malloc-large`) MEM_RESET is 2x faster than DiscardVirtualMemory + void* p = VirtualAlloc(start, csize, MEM_RESET, PAGE_READWRITE); + mi_assert_internal(p == start); + #if 1 + if (p == start && start != NULL) { + VirtualUnlock(start,csize); // VirtualUnlock after MEM_RESET removes the memory from the working set + } + #endif + if (p != start) return false; +#else +#if defined(MADV_FREE) + static _Atomic(size_t) advice = MI_ATOMIC_VAR_INIT(MADV_FREE); + int oadvice = (int)mi_atomic_load_relaxed(&advice); + int err; + while ((err = mi_madvise(start, csize, oadvice)) != 0 && errno == EAGAIN) { errno = 0; }; + if (err != 0 && errno == EINVAL && oadvice == MADV_FREE) { + // if MADV_FREE is not supported, fall back to MADV_DONTNEED from now on + mi_atomic_store_release(&advice, (size_t)MADV_DONTNEED); + err = mi_madvise(start, csize, MADV_DONTNEED); + } +#elif defined(__wasi__) + int err = 0; +#else + int err = mi_madvise(start, csize, MADV_DONTNEED); +#endif + if (err != 0) { + _mi_warning_message("madvise reset error: start: %p, csize: 0x%zx, errno: %i\n", start, csize, errno); + } + //mi_assert(err == 0); + if (err != 0) return false; +#endif + return true; +} + +// Signal to the OS that the address range is no longer in use +// but may be used later again. This will release physical memory +// pages and reduce swapping while keeping the memory committed. +// We page align to a conservative area inside the range to reset. +bool _mi_os_reset(void* addr, size_t size, mi_stats_t* tld_stats) { + MI_UNUSED(tld_stats); + mi_stats_t* stats = &_mi_stats_main; + return mi_os_resetx(addr, size, true, stats); +} + +/* +bool _mi_os_unreset(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats) { + MI_UNUSED(tld_stats); + mi_stats_t* stats = &_mi_stats_main; + if (mi_option_is_enabled(mi_option_reset_decommits)) { + return mi_os_commit_unreset(addr, size, is_zero, stats); // re-commit it (conservatively!) + } + else { + *is_zero = false; + return mi_os_resetx(addr, size, false, stats); + } +} +*/ + +// Protect a region in memory to be not accessible. +static bool mi_os_protectx(void* addr, size_t size, bool protect) { + // page align conservatively within the range + size_t csize = 0; + void* start = mi_os_page_align_area_conservative(addr, size, &csize); + if (csize == 0) return false; + /* + if (_mi_os_is_huge_reserved(addr)) { + _mi_warning_message("cannot mprotect memory allocated in huge OS pages\n"); + } + */ + int err = 0; +#ifdef _WIN32 + DWORD oldprotect = 0; + BOOL ok = VirtualProtect(start, csize, protect ? PAGE_NOACCESS : PAGE_READWRITE, &oldprotect); + err = (ok ? 0 : GetLastError()); +#elif defined(__wasi__) + err = 0; +#else + err = mprotect(start, csize, protect ? PROT_NONE : (PROT_READ | PROT_WRITE)); + if (err != 0) { err = errno; } +#endif + if (err != 0) { + _mi_warning_message("mprotect error: start: %p, csize: 0x%zx, err: %i\n", start, csize, err); + mi_mprotect_hint(err); + } + return (err == 0); +} + +bool _mi_os_protect(void* addr, size_t size) { + return mi_os_protectx(addr, size, true); +} + +bool _mi_os_unprotect(void* addr, size_t size) { + return mi_os_protectx(addr, size, false); +} + + + +bool _mi_os_shrink(void* p, size_t oldsize, size_t newsize, mi_stats_t* stats) { + // page align conservatively within the range + mi_assert_internal(oldsize > newsize && p != NULL); + if (oldsize < newsize || p == NULL) return false; + if (oldsize == newsize) return true; + + // oldsize and newsize should be page aligned or we cannot shrink precisely + void* addr = (uint8_t*)p + newsize; + size_t size = 0; + void* start = mi_os_page_align_area_conservative(addr, oldsize - newsize, &size); + if (size == 0 || start != addr) return false; + +#ifdef _WIN32 + // we cannot shrink on windows, but we can decommit + return _mi_os_decommit(start, size, stats); +#else + return mi_os_mem_free(start, size, true, stats); +#endif +} + + +/* ---------------------------------------------------------------------------- +Support for allocating huge OS pages (1Gib) that are reserved up-front +and possibly associated with a specific NUMA node. (use `numa_node>=0`) +-----------------------------------------------------------------------------*/ +#define MI_HUGE_OS_PAGE_SIZE (MI_GiB) + +#if defined(_WIN32) && (MI_INTPTR_SIZE >= 8) +static void* mi_os_alloc_huge_os_pagesx(void* addr, size_t size, int numa_node) +{ + mi_assert_internal(size%MI_GiB == 0); + mi_assert_internal(addr != NULL); + const DWORD flags = MEM_LARGE_PAGES | MEM_COMMIT | MEM_RESERVE; + + mi_win_enable_large_os_pages(); + + MI_MEM_EXTENDED_PARAMETER params[3] = { {{0,0},{0}},{{0,0},{0}},{{0,0},{0}} }; + // on modern Windows try use NtAllocateVirtualMemoryEx for 1GiB huge pages + static bool mi_huge_pages_available = true; + if (pNtAllocateVirtualMemoryEx != NULL && mi_huge_pages_available) { + params[0].Type.Type = MiMemExtendedParameterAttributeFlags; + params[0].Arg.ULong64 = MI_MEM_EXTENDED_PARAMETER_NONPAGED_HUGE; + ULONG param_count = 1; + if (numa_node >= 0) { + param_count++; + params[1].Type.Type = MiMemExtendedParameterNumaNode; + params[1].Arg.ULong = (unsigned)numa_node; + } + SIZE_T psize = size; + void* base = addr; + NTSTATUS err = (*pNtAllocateVirtualMemoryEx)(GetCurrentProcess(), &base, &psize, flags, PAGE_READWRITE, params, param_count); + if (err == 0 && base != NULL) { + return base; + } + else { + // fall back to regular large pages + mi_huge_pages_available = false; // don't try further huge pages + _mi_warning_message("unable to allocate using huge (1GiB) pages, trying large (2MiB) pages instead (status 0x%lx)\n", err); + } + } + // on modern Windows try use VirtualAlloc2 for numa aware large OS page allocation + if (pVirtualAlloc2 != NULL && numa_node >= 0) { + params[0].Type.Type = MiMemExtendedParameterNumaNode; + params[0].Arg.ULong = (unsigned)numa_node; + return (*pVirtualAlloc2)(GetCurrentProcess(), addr, size, flags, PAGE_READWRITE, params, 1); + } + + // otherwise use regular virtual alloc on older windows + return VirtualAlloc(addr, size, flags, PAGE_READWRITE); +} + +#elif defined(MI_OS_USE_MMAP) && (MI_INTPTR_SIZE >= 8) && !defined(__HAIKU__) +#include +#ifndef MPOL_PREFERRED +#define MPOL_PREFERRED 1 +#endif +#if defined(SYS_mbind) +static long mi_os_mbind(void* start, unsigned long len, unsigned long mode, const unsigned long* nmask, unsigned long maxnode, unsigned flags) { + return syscall(SYS_mbind, start, len, mode, nmask, maxnode, flags); +} +#else +static long mi_os_mbind(void* start, unsigned long len, unsigned long mode, const unsigned long* nmask, unsigned long maxnode, unsigned flags) { + MI_UNUSED(start); MI_UNUSED(len); MI_UNUSED(mode); MI_UNUSED(nmask); MI_UNUSED(maxnode); MI_UNUSED(flags); + return 0; +} +#endif +static void* mi_os_alloc_huge_os_pagesx(void* addr, size_t size, int numa_node) { + mi_assert_internal(size%MI_GiB == 0); + bool is_large = true; + void* p = mi_unix_mmap(addr, size, MI_SEGMENT_SIZE, PROT_READ | PROT_WRITE, true, true, &is_large); + if (p == NULL) return NULL; + if (numa_node >= 0 && numa_node < 8*MI_INTPTR_SIZE) { // at most 64 nodes + unsigned long numa_mask = (1UL << numa_node); + // TODO: does `mbind` work correctly for huge OS pages? should we + // use `set_mempolicy` before calling mmap instead? + // see: + long err = mi_os_mbind(p, size, MPOL_PREFERRED, &numa_mask, 8*MI_INTPTR_SIZE, 0); + if (err != 0) { + _mi_warning_message("failed to bind huge (1GiB) pages to numa node %d: %s\n", numa_node, strerror(errno)); + } + } + return p; +} +#else +static void* mi_os_alloc_huge_os_pagesx(void* addr, size_t size, int numa_node) { + MI_UNUSED(addr); MI_UNUSED(size); MI_UNUSED(numa_node); + return NULL; +} +#endif + +#if (MI_INTPTR_SIZE >= 8) +// To ensure proper alignment, use our own area for huge OS pages +static mi_decl_cache_align _Atomic(uintptr_t) mi_huge_start; // = 0 + +// Claim an aligned address range for huge pages +static uint8_t* mi_os_claim_huge_pages(size_t pages, size_t* total_size) { + if (total_size != NULL) *total_size = 0; + const size_t size = pages * MI_HUGE_OS_PAGE_SIZE; + + uintptr_t start = 0; + uintptr_t end = 0; + uintptr_t huge_start = mi_atomic_load_relaxed(&mi_huge_start); + do { + start = huge_start; + if (start == 0) { + // Initialize the start address after the 32TiB area + start = ((uintptr_t)32 << 40); // 32TiB virtual start address +#if (MI_SECURE>0 || MI_DEBUG==0) // security: randomize start of huge pages unless in debug mode + uintptr_t r = _mi_heap_random_next(mi_get_default_heap()); + start = start + ((uintptr_t)MI_HUGE_OS_PAGE_SIZE * ((r>>17) & 0x0FFF)); // (randomly 12bits)*1GiB == between 0 to 4TiB +#endif + } + end = start + size; + mi_assert_internal(end % MI_SEGMENT_SIZE == 0); + } while (!mi_atomic_cas_strong_acq_rel(&mi_huge_start, &huge_start, end)); + + if (total_size != NULL) *total_size = size; + return (uint8_t*)start; +} +#else +static uint8_t* mi_os_claim_huge_pages(size_t pages, size_t* total_size) { + MI_UNUSED(pages); + if (total_size != NULL) *total_size = 0; + return NULL; +} +#endif + +// Allocate MI_SEGMENT_SIZE aligned huge pages +void* _mi_os_alloc_huge_os_pages(size_t pages, int numa_node, mi_msecs_t max_msecs, size_t* pages_reserved, size_t* psize) { + if (psize != NULL) *psize = 0; + if (pages_reserved != NULL) *pages_reserved = 0; + size_t size = 0; + uint8_t* start = mi_os_claim_huge_pages(pages, &size); + if (start == NULL) return NULL; // or 32-bit systems + + // Allocate one page at the time but try to place them contiguously + // We allocate one page at the time to be able to abort if it takes too long + // or to at least allocate as many as available on the system. + mi_msecs_t start_t = _mi_clock_start(); + size_t page; + for (page = 0; page < pages; page++) { + // allocate a page + void* addr = start + (page * MI_HUGE_OS_PAGE_SIZE); + void* p = mi_os_alloc_huge_os_pagesx(addr, MI_HUGE_OS_PAGE_SIZE, numa_node); + + // Did we succeed at a contiguous address? + if (p != addr) { + // no success, issue a warning and break + if (p != NULL) { + _mi_warning_message("could not allocate contiguous huge page %zu at %p\n", page, addr); + _mi_os_free(p, MI_HUGE_OS_PAGE_SIZE, &_mi_stats_main); + } + break; + } + + // success, record it + _mi_stat_increase(&_mi_stats_main.committed, MI_HUGE_OS_PAGE_SIZE); + _mi_stat_increase(&_mi_stats_main.reserved, MI_HUGE_OS_PAGE_SIZE); + + // check for timeout + if (max_msecs > 0) { + mi_msecs_t elapsed = _mi_clock_end(start_t); + if (page >= 1) { + mi_msecs_t estimate = ((elapsed / (page+1)) * pages); + if (estimate > 2*max_msecs) { // seems like we are going to timeout, break + elapsed = max_msecs + 1; + } + } + if (elapsed > max_msecs) { + _mi_warning_message("huge page allocation timed out\n"); + break; + } + } + } + mi_assert_internal(page*MI_HUGE_OS_PAGE_SIZE <= size); + if (pages_reserved != NULL) { *pages_reserved = page; } + if (psize != NULL) { *psize = page * MI_HUGE_OS_PAGE_SIZE; } + return (page == 0 ? NULL : start); +} + +// free every huge page in a range individually (as we allocated per page) +// note: needed with VirtualAlloc but could potentially be done in one go on mmap'd systems. +void _mi_os_free_huge_pages(void* p, size_t size, mi_stats_t* stats) { + if (p==NULL || size==0) return; + uint8_t* base = (uint8_t*)p; + while (size >= MI_HUGE_OS_PAGE_SIZE) { + _mi_os_free(base, MI_HUGE_OS_PAGE_SIZE, stats); + size -= MI_HUGE_OS_PAGE_SIZE; + base += MI_HUGE_OS_PAGE_SIZE; + } +} + +/* ---------------------------------------------------------------------------- +Support NUMA aware allocation +-----------------------------------------------------------------------------*/ +#ifdef _WIN32 +static size_t mi_os_numa_nodex(void) { + USHORT numa_node = 0; + if (pGetCurrentProcessorNumberEx != NULL && pGetNumaProcessorNodeEx != NULL) { + // Extended API is supported + MI_PROCESSOR_NUMBER pnum; + (*pGetCurrentProcessorNumberEx)(&pnum); + USHORT nnode = 0; + BOOL ok = (*pGetNumaProcessorNodeEx)(&pnum, &nnode); + if (ok) numa_node = nnode; + } + else { + // Vista or earlier, use older API that is limited to 64 processors. Issue #277 + DWORD pnum = GetCurrentProcessorNumber(); + UCHAR nnode = 0; + BOOL ok = GetNumaProcessorNode((UCHAR)pnum, &nnode); + if (ok) numa_node = nnode; + } + return numa_node; +} + +static size_t mi_os_numa_node_countx(void) { + ULONG numa_max = 0; + GetNumaHighestNodeNumber(&numa_max); + // find the highest node number that has actual processors assigned to it. Issue #282 + while(numa_max > 0) { + if (pGetNumaNodeProcessorMaskEx != NULL) { + // Extended API is supported + GROUP_AFFINITY affinity; + if ((*pGetNumaNodeProcessorMaskEx)((USHORT)numa_max, &affinity)) { + if (affinity.Mask != 0) break; // found the maximum non-empty node + } + } + else { + // Vista or earlier, use older API that is limited to 64 processors. + ULONGLONG mask; + if (GetNumaNodeProcessorMask((UCHAR)numa_max, &mask)) { + if (mask != 0) break; // found the maximum non-empty node + }; + } + // max node was invalid or had no processor assigned, try again + numa_max--; + } + return ((size_t)numa_max + 1); +} +#elif defined(__linux__) +#include // getcpu +#include // access + +static size_t mi_os_numa_nodex(void) { +#ifdef SYS_getcpu + unsigned long node = 0; + unsigned long ncpu = 0; + long err = syscall(SYS_getcpu, &ncpu, &node, NULL); + if (err != 0) return 0; + return node; +#else + return 0; +#endif +} +static size_t mi_os_numa_node_countx(void) { + char buf[128]; + unsigned node = 0; + for(node = 0; node < 256; node++) { + // enumerate node entries -- todo: it there a more efficient way to do this? (but ensure there is no allocation) + snprintf(buf, 127, "/sys/devices/system/node/node%u", node + 1); + if (access(buf,R_OK) != 0) break; + } + return (node+1); +} +#elif defined(__FreeBSD__) && __FreeBSD_version >= 1200000 +static size_t mi_os_numa_nodex(void) { + domainset_t dom; + size_t node; + int policy; + if (cpuset_getdomain(CPU_LEVEL_CPUSET, CPU_WHICH_PID, -1, sizeof(dom), &dom, &policy) == -1) return 0ul; + for (node = 0; node < MAXMEMDOM; node++) { + if (DOMAINSET_ISSET(node, &dom)) return node; + } + return 0ul; +} +static size_t mi_os_numa_node_countx(void) { + size_t ndomains = 0; + size_t len = sizeof(ndomains); + if (sysctlbyname("vm.ndomains", &ndomains, &len, NULL, 0) == -1) return 0ul; + return ndomains; +} +#elif defined(__DragonFly__) +static size_t mi_os_numa_nodex(void) { + // TODO: DragonFly does not seem to provide any userland means to get this information. + return 0ul; +} +static size_t mi_os_numa_node_countx(void) { + size_t ncpus = 0, nvirtcoresperphys = 0; + size_t len = sizeof(size_t); + if (sysctlbyname("hw.ncpu", &ncpus, &len, NULL, 0) == -1) return 0ul; + if (sysctlbyname("hw.cpu_topology_ht_ids", &nvirtcoresperphys, &len, NULL, 0) == -1) return 0ul; + return nvirtcoresperphys * ncpus; +} +#else +static size_t mi_os_numa_nodex(void) { + return 0; +} +static size_t mi_os_numa_node_countx(void) { + return 1; +} +#endif + +_Atomic(size_t) _mi_numa_node_count; // = 0 // cache the node count + +size_t _mi_os_numa_node_count_get(void) { + size_t count = mi_atomic_load_acquire(&_mi_numa_node_count); + if (count <= 0) { + long ncount = mi_option_get(mi_option_use_numa_nodes); // given explicitly? + if (ncount > 0) { + count = (size_t)ncount; + } + else { + count = mi_os_numa_node_countx(); // or detect dynamically + if (count == 0) count = 1; + } + mi_atomic_store_release(&_mi_numa_node_count, count); // save it + _mi_verbose_message("using %zd numa regions\n", count); + } + return count; +} + +int _mi_os_numa_node_get(mi_os_tld_t* tld) { + MI_UNUSED(tld); + size_t numa_count = _mi_os_numa_node_count(); + if (numa_count<=1) return 0; // optimize on single numa node systems: always node 0 + // never more than the node count and >= 0 + size_t numa_node = mi_os_numa_nodex(); + if (numa_node >= numa_count) { numa_node = numa_node % numa_count; } + return (int)numa_node; +} diff --git a/compat/mimalloc/page-queue.c b/compat/mimalloc/page-queue.c new file mode 100644 index 00000000000000..e1a8a6a6592b86 --- /dev/null +++ b/compat/mimalloc/page-queue.c @@ -0,0 +1,331 @@ +/*---------------------------------------------------------------------------- +Copyright (c) 2018-2020, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +/* ----------------------------------------------------------- + Definition of page queues for each block size +----------------------------------------------------------- */ + +#ifndef MI_IN_PAGE_C +#error "this file should be included from 'page.c'" +#endif + +/* ----------------------------------------------------------- + Minimal alignment in machine words (i.e. `sizeof(void*)`) +----------------------------------------------------------- */ + +#if (MI_MAX_ALIGN_SIZE > 4*MI_INTPTR_SIZE) + #error "define alignment for more than 4x word size for this platform" +#elif (MI_MAX_ALIGN_SIZE > 2*MI_INTPTR_SIZE) + #define MI_ALIGN4W // 4 machine words minimal alignment +#elif (MI_MAX_ALIGN_SIZE > MI_INTPTR_SIZE) + #define MI_ALIGN2W // 2 machine words minimal alignment +#else + // ok, default alignment is 1 word +#endif + + +/* ----------------------------------------------------------- + Queue query +----------------------------------------------------------- */ + + +static inline bool mi_page_queue_is_huge(const mi_page_queue_t* pq) { + return (pq->block_size == (MI_MEDIUM_OBJ_SIZE_MAX+sizeof(uintptr_t))); +} + +static inline bool mi_page_queue_is_full(const mi_page_queue_t* pq) { + return (pq->block_size == (MI_MEDIUM_OBJ_SIZE_MAX+(2*sizeof(uintptr_t)))); +} + +static inline bool mi_page_queue_is_special(const mi_page_queue_t* pq) { + return (pq->block_size > MI_MEDIUM_OBJ_SIZE_MAX); +} + +/* ----------------------------------------------------------- + Bins +----------------------------------------------------------- */ + +// Return the bin for a given field size. +// Returns MI_BIN_HUGE if the size is too large. +// We use `wsize` for the size in "machine word sizes", +// i.e. byte size == `wsize*sizeof(void*)`. +static inline uint8_t mi_bin(size_t size) { + size_t wsize = _mi_wsize_from_size(size); + uint8_t bin; + if (wsize <= 1) { + bin = 1; + } + #if defined(MI_ALIGN4W) + else if (wsize <= 4) { + bin = (uint8_t)((wsize+1)&~1); // round to double word sizes + } + #elif defined(MI_ALIGN2W) + else if (wsize <= 8) { + bin = (uint8_t)((wsize+1)&~1); // round to double word sizes + } + #else + else if (wsize <= 8) { + bin = (uint8_t)wsize; + } + #endif + else if (wsize > MI_MEDIUM_OBJ_WSIZE_MAX) { + bin = MI_BIN_HUGE; + } + else { + #if defined(MI_ALIGN4W) + if (wsize <= 16) { wsize = (wsize+3)&~3; } // round to 4x word sizes + #endif + wsize--; + // find the highest bit + uint8_t b = (uint8_t)mi_bsr(wsize); // note: wsize != 0 + // and use the top 3 bits to determine the bin (~12.5% worst internal fragmentation). + // - adjust with 3 because we use do not round the first 8 sizes + // which each get an exact bin + bin = ((b << 2) + (uint8_t)((wsize >> (b - 2)) & 0x03)) - 3; + mi_assert_internal(bin < MI_BIN_HUGE); + } + mi_assert_internal(bin > 0 && bin <= MI_BIN_HUGE); + return bin; +} + + + +/* ----------------------------------------------------------- + Queue of pages with free blocks +----------------------------------------------------------- */ + +uint8_t _mi_bin(size_t size) { + return mi_bin(size); +} + +size_t _mi_bin_size(uint8_t bin) { + return _mi_heap_empty.pages[bin].block_size; +} + +// Good size for allocation +size_t mi_good_size(size_t size) mi_attr_noexcept { + if (size <= MI_MEDIUM_OBJ_SIZE_MAX) { + return _mi_bin_size(mi_bin(size)); + } + else { + return _mi_align_up(size,_mi_os_page_size()); + } +} + +#if (MI_DEBUG>1) +static bool mi_page_queue_contains(mi_page_queue_t* queue, const mi_page_t* page) { + mi_assert_internal(page != NULL); + mi_page_t* list = queue->first; + while (list != NULL) { + mi_assert_internal(list->next == NULL || list->next->prev == list); + mi_assert_internal(list->prev == NULL || list->prev->next == list); + if (list == page) break; + list = list->next; + } + return (list == page); +} + +#endif + +#if (MI_DEBUG>1) +static bool mi_heap_contains_queue(const mi_heap_t* heap, const mi_page_queue_t* pq) { + return (pq >= &heap->pages[0] && pq <= &heap->pages[MI_BIN_FULL]); +} +#endif + +static mi_page_queue_t* mi_page_queue_of(const mi_page_t* page) { + uint8_t bin = (mi_page_is_in_full(page) ? MI_BIN_FULL : mi_bin(page->xblock_size)); + mi_heap_t* heap = mi_page_heap(page); + mi_assert_internal(heap != NULL && bin <= MI_BIN_FULL); + mi_page_queue_t* pq = &heap->pages[bin]; + mi_assert_internal(bin >= MI_BIN_HUGE || page->xblock_size == pq->block_size); + mi_assert_expensive(mi_page_queue_contains(pq, page)); + return pq; +} + +static mi_page_queue_t* mi_heap_page_queue_of(mi_heap_t* heap, const mi_page_t* page) { + uint8_t bin = (mi_page_is_in_full(page) ? MI_BIN_FULL : mi_bin(page->xblock_size)); + mi_assert_internal(bin <= MI_BIN_FULL); + mi_page_queue_t* pq = &heap->pages[bin]; + mi_assert_internal(mi_page_is_in_full(page) || page->xblock_size == pq->block_size); + return pq; +} + +// The current small page array is for efficiency and for each +// small size (up to 256) it points directly to the page for that +// size without having to compute the bin. This means when the +// current free page queue is updated for a small bin, we need to update a +// range of entries in `_mi_page_small_free`. +static inline void mi_heap_queue_first_update(mi_heap_t* heap, const mi_page_queue_t* pq) { + mi_assert_internal(mi_heap_contains_queue(heap,pq)); + size_t size = pq->block_size; + if (size > MI_SMALL_SIZE_MAX) return; + + mi_page_t* page = pq->first; + if (pq->first == NULL) page = (mi_page_t*)&_mi_page_empty; + + // find index in the right direct page array + size_t start; + size_t idx = _mi_wsize_from_size(size); + mi_page_t** pages_free = heap->pages_free_direct; + + if (pages_free[idx] == page) return; // already set + + // find start slot + if (idx<=1) { + start = 0; + } + else { + // find previous size; due to minimal alignment upto 3 previous bins may need to be skipped + uint8_t bin = mi_bin(size); + const mi_page_queue_t* prev = pq - 1; + while( bin == mi_bin(prev->block_size) && prev > &heap->pages[0]) { + prev--; + } + start = 1 + _mi_wsize_from_size(prev->block_size); + if (start > idx) start = idx; + } + + // set size range to the right page + mi_assert(start <= idx); + for (size_t sz = start; sz <= idx; sz++) { + pages_free[sz] = page; + } +} + +/* +static bool mi_page_queue_is_empty(mi_page_queue_t* queue) { + return (queue->first == NULL); +} +*/ + +static void mi_page_queue_remove(mi_page_queue_t* queue, mi_page_t* page) { + mi_assert_internal(page != NULL); + mi_assert_expensive(mi_page_queue_contains(queue, page)); + mi_assert_internal(page->xblock_size == queue->block_size || (page->xblock_size > MI_MEDIUM_OBJ_SIZE_MAX && mi_page_queue_is_huge(queue)) || (mi_page_is_in_full(page) && mi_page_queue_is_full(queue))); + mi_heap_t* heap = mi_page_heap(page); + + if (page->prev != NULL) page->prev->next = page->next; + if (page->next != NULL) page->next->prev = page->prev; + if (page == queue->last) queue->last = page->prev; + if (page == queue->first) { + queue->first = page->next; + // update first + mi_assert_internal(mi_heap_contains_queue(heap, queue)); + mi_heap_queue_first_update(heap,queue); + } + heap->page_count--; + page->next = NULL; + page->prev = NULL; + // mi_atomic_store_ptr_release(mi_atomic_cast(void*, &page->heap), NULL); + mi_page_set_in_full(page,false); +} + + +static void mi_page_queue_push(mi_heap_t* heap, mi_page_queue_t* queue, mi_page_t* page) { + mi_assert_internal(mi_page_heap(page) == heap); + mi_assert_internal(!mi_page_queue_contains(queue, page)); + + mi_assert_internal(_mi_page_segment(page)->kind != MI_SEGMENT_HUGE); + mi_assert_internal(page->xblock_size == queue->block_size || + (page->xblock_size > MI_MEDIUM_OBJ_SIZE_MAX) || + (mi_page_is_in_full(page) && mi_page_queue_is_full(queue))); + + mi_page_set_in_full(page, mi_page_queue_is_full(queue)); + // mi_atomic_store_ptr_release(mi_atomic_cast(void*, &page->heap), heap); + page->next = queue->first; + page->prev = NULL; + if (queue->first != NULL) { + mi_assert_internal(queue->first->prev == NULL); + queue->first->prev = page; + queue->first = page; + } + else { + queue->first = queue->last = page; + } + + // update direct + mi_heap_queue_first_update(heap, queue); + heap->page_count++; +} + + +static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) { + mi_assert_internal(page != NULL); + mi_assert_expensive(mi_page_queue_contains(from, page)); + mi_assert_expensive(!mi_page_queue_contains(to, page)); + + mi_assert_internal((page->xblock_size == to->block_size && page->xblock_size == from->block_size) || + (page->xblock_size == to->block_size && mi_page_queue_is_full(from)) || + (page->xblock_size == from->block_size && mi_page_queue_is_full(to)) || + (page->xblock_size > MI_LARGE_OBJ_SIZE_MAX && mi_page_queue_is_huge(to)) || + (page->xblock_size > MI_LARGE_OBJ_SIZE_MAX && mi_page_queue_is_full(to))); + + mi_heap_t* heap = mi_page_heap(page); + if (page->prev != NULL) page->prev->next = page->next; + if (page->next != NULL) page->next->prev = page->prev; + if (page == from->last) from->last = page->prev; + if (page == from->first) { + from->first = page->next; + // update first + mi_assert_internal(mi_heap_contains_queue(heap, from)); + mi_heap_queue_first_update(heap, from); + } + + page->prev = to->last; + page->next = NULL; + if (to->last != NULL) { + mi_assert_internal(heap == mi_page_heap(to->last)); + to->last->next = page; + to->last = page; + } + else { + to->first = page; + to->last = page; + mi_heap_queue_first_update(heap, to); + } + + mi_page_set_in_full(page, mi_page_queue_is_full(to)); +} + +// Only called from `mi_heap_absorb`. +size_t _mi_page_queue_append(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_queue_t* append) { + mi_assert_internal(mi_heap_contains_queue(heap,pq)); + mi_assert_internal(pq->block_size == append->block_size); + + if (append->first==NULL) return 0; + + // set append pages to new heap and count + size_t count = 0; + for (mi_page_t* page = append->first; page != NULL; page = page->next) { + // inline `mi_page_set_heap` to avoid wrong assertion during absorption; + // in this case it is ok to be delayed freeing since both "to" and "from" heap are still alive. + mi_atomic_store_release(&page->xheap, (uintptr_t)heap); + // set the flag to delayed free (not overriding NEVER_DELAYED_FREE) which has as a + // side effect that it spins until any DELAYED_FREEING is finished. This ensures + // that after appending only the new heap will be used for delayed free operations. + _mi_page_use_delayed_free(page, MI_USE_DELAYED_FREE, false); + count++; + } + + if (pq->last==NULL) { + // take over afresh + mi_assert_internal(pq->first==NULL); + pq->first = append->first; + pq->last = append->last; + mi_heap_queue_first_update(heap, pq); + } + else { + // append to end + mi_assert_internal(pq->last!=NULL); + mi_assert_internal(append->first!=NULL); + pq->last->next = append->first; + append->first->prev = pq->last; + pq->last = append->last; + } + return count; +} diff --git a/compat/mimalloc/page.c b/compat/mimalloc/page.c new file mode 100644 index 00000000000000..121683015de6b2 --- /dev/null +++ b/compat/mimalloc/page.c @@ -0,0 +1,869 @@ +/*---------------------------------------------------------------------------- +Copyright (c) 2018-2020, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +/* ----------------------------------------------------------- + The core of the allocator. Every segment contains + pages of a certain block size. The main function + exported is `mi_malloc_generic`. +----------------------------------------------------------- */ + +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +/* ----------------------------------------------------------- + Definition of page queues for each block size +----------------------------------------------------------- */ + +#define MI_IN_PAGE_C +#include "page-queue.c" +#undef MI_IN_PAGE_C + + +/* ----------------------------------------------------------- + Page helpers +----------------------------------------------------------- */ + +// Index a block in a page +static inline mi_block_t* mi_page_block_at(const mi_page_t* page, void* page_start, size_t block_size, size_t i) { + MI_UNUSED(page); + mi_assert_internal(page != NULL); + mi_assert_internal(i <= page->reserved); + return (mi_block_t*)((uint8_t*)page_start + (i * block_size)); +} + +static void mi_page_init(mi_heap_t* heap, mi_page_t* page, size_t size, mi_tld_t* tld); +static void mi_page_extend_free(mi_heap_t* heap, mi_page_t* page, mi_tld_t* tld); + +#if (MI_DEBUG>=3) +static size_t mi_page_list_count(mi_page_t* page, mi_block_t* head) { + size_t count = 0; + while (head != NULL) { + mi_assert_internal(page == _mi_ptr_page(head)); + count++; + head = mi_block_next(page, head); + } + return count; +} + +/* +// Start of the page available memory +static inline uint8_t* mi_page_area(const mi_page_t* page) { + return _mi_page_start(_mi_page_segment(page), page, NULL); +} +*/ + +static bool mi_page_list_is_valid(mi_page_t* page, mi_block_t* p) { + size_t psize; + uint8_t* page_area = _mi_page_start(_mi_page_segment(page), page, &psize); + mi_block_t* start = (mi_block_t*)page_area; + mi_block_t* end = (mi_block_t*)(page_area + psize); + while(p != NULL) { + if (p < start || p >= end) return false; + p = mi_block_next(page, p); + } + return true; +} + +static bool mi_page_is_valid_init(mi_page_t* page) { + mi_assert_internal(page->xblock_size > 0); + mi_assert_internal(page->used <= page->capacity); + mi_assert_internal(page->capacity <= page->reserved); + + mi_segment_t* segment = _mi_page_segment(page); + uint8_t* start = _mi_page_start(segment,page,NULL); + mi_assert_internal(start == _mi_segment_page_start(segment,page,NULL)); + //const size_t bsize = mi_page_block_size(page); + //mi_assert_internal(start + page->capacity*page->block_size == page->top); + + mi_assert_internal(mi_page_list_is_valid(page,page->free)); + mi_assert_internal(mi_page_list_is_valid(page,page->local_free)); + + #if MI_DEBUG>3 // generally too expensive to check this + if (page->is_zero) { + const size_t ubsize = mi_page_usable_block_size(page); + for(mi_block_t* block = page->free; block != NULL; block = mi_block_next(page,block)) { + mi_assert_expensive(mi_mem_is_zero(block + 1, ubsize - sizeof(mi_block_t))); + } + } + #endif + + mi_block_t* tfree = mi_page_thread_free(page); + mi_assert_internal(mi_page_list_is_valid(page, tfree)); + //size_t tfree_count = mi_page_list_count(page, tfree); + //mi_assert_internal(tfree_count <= page->thread_freed + 1); + + size_t free_count = mi_page_list_count(page, page->free) + mi_page_list_count(page, page->local_free); + mi_assert_internal(page->used + free_count == page->capacity); + + return true; +} + +bool _mi_page_is_valid(mi_page_t* page) { + mi_assert_internal(mi_page_is_valid_init(page)); + #if MI_SECURE + mi_assert_internal(page->keys[0] != 0); + #endif + if (mi_page_heap(page)!=NULL) { + mi_segment_t* segment = _mi_page_segment(page); + + mi_assert_internal(!_mi_process_is_initialized || segment->thread_id==0 || segment->thread_id == mi_page_heap(page)->thread_id); + if (segment->kind != MI_SEGMENT_HUGE) { + mi_page_queue_t* pq = mi_page_queue_of(page); + mi_assert_internal(mi_page_queue_contains(pq, page)); + mi_assert_internal(pq->block_size==mi_page_block_size(page) || mi_page_block_size(page) > MI_MEDIUM_OBJ_SIZE_MAX || mi_page_is_in_full(page)); + mi_assert_internal(mi_heap_contains_queue(mi_page_heap(page),pq)); + } + } + return true; +} +#endif + +void _mi_page_use_delayed_free(mi_page_t* page, mi_delayed_t delay, bool override_never) { + mi_thread_free_t tfreex; + mi_delayed_t old_delay; + mi_thread_free_t tfree; + do { + tfree = mi_atomic_load_acquire(&page->xthread_free); // note: must acquire as we can break/repeat this loop and not do a CAS; + tfreex = mi_tf_set_delayed(tfree, delay); + old_delay = mi_tf_delayed(tfree); + if (mi_unlikely(old_delay == MI_DELAYED_FREEING)) { + mi_atomic_yield(); // delay until outstanding MI_DELAYED_FREEING are done. + // tfree = mi_tf_set_delayed(tfree, MI_NO_DELAYED_FREE); // will cause CAS to busy fail + } + else if (delay == old_delay) { + break; // avoid atomic operation if already equal + } + else if (!override_never && old_delay == MI_NEVER_DELAYED_FREE) { + break; // leave never-delayed flag set + } + } while ((old_delay == MI_DELAYED_FREEING) || + !mi_atomic_cas_weak_release(&page->xthread_free, &tfree, tfreex)); +} + +/* ----------------------------------------------------------- + Page collect the `local_free` and `thread_free` lists +----------------------------------------------------------- */ + +// Collect the local `thread_free` list using an atomic exchange. +// Note: The exchange must be done atomically as this is used right after +// moving to the full list in `mi_page_collect_ex` and we need to +// ensure that there was no race where the page became unfull just before the move. +static void _mi_page_thread_free_collect(mi_page_t* page) +{ + mi_block_t* head; + mi_thread_free_t tfreex; + mi_thread_free_t tfree = mi_atomic_load_relaxed(&page->xthread_free); + do { + head = mi_tf_block(tfree); + tfreex = mi_tf_set_block(tfree,NULL); + } while (!mi_atomic_cas_weak_acq_rel(&page->xthread_free, &tfree, tfreex)); + + // return if the list is empty + if (head == NULL) return; + + // find the tail -- also to get a proper count (without data races) + uint32_t max_count = page->capacity; // cannot collect more than capacity + uint32_t count = 1; + mi_block_t* tail = head; + mi_block_t* next; + while ((next = mi_block_next(page,tail)) != NULL && count <= max_count) { + count++; + tail = next; + } + // if `count > max_count` there was a memory corruption (possibly infinite list due to double multi-threaded free) + if (count > max_count) { + _mi_error_message(EFAULT, "corrupted thread-free list\n"); + return; // the thread-free items cannot be freed + } + + // and append the current local free list + mi_block_set_next(page,tail, page->local_free); + page->local_free = head; + + // update counts now + page->used -= count; +} + +void _mi_page_free_collect(mi_page_t* page, bool force) { + mi_assert_internal(page!=NULL); + + // collect the thread free list + if (force || mi_page_thread_free(page) != NULL) { // quick test to avoid an atomic operation + _mi_page_thread_free_collect(page); + } + + // and the local free list + if (page->local_free != NULL) { + if (mi_likely(page->free == NULL)) { + // usual case + page->free = page->local_free; + page->local_free = NULL; + page->is_zero = false; + } + else if (force) { + // append -- only on shutdown (force) as this is a linear operation + mi_block_t* tail = page->local_free; + mi_block_t* next; + while ((next = mi_block_next(page, tail)) != NULL) { + tail = next; + } + mi_block_set_next(page, tail, page->free); + page->free = page->local_free; + page->local_free = NULL; + page->is_zero = false; + } + } + + mi_assert_internal(!force || page->local_free == NULL); +} + + + +/* ----------------------------------------------------------- + Page fresh and retire +----------------------------------------------------------- */ + +// called from segments when reclaiming abandoned pages +void _mi_page_reclaim(mi_heap_t* heap, mi_page_t* page) { + mi_assert_expensive(mi_page_is_valid_init(page)); + + mi_assert_internal(mi_page_heap(page) == heap); + mi_assert_internal(mi_page_thread_free_flag(page) != MI_NEVER_DELAYED_FREE); + mi_assert_internal(_mi_page_segment(page)->kind != MI_SEGMENT_HUGE); + mi_assert_internal(!page->is_reset); + // TODO: push on full queue immediately if it is full? + mi_page_queue_t* pq = mi_page_queue(heap, mi_page_block_size(page)); + mi_page_queue_push(heap, pq, page); + mi_assert_expensive(_mi_page_is_valid(page)); +} + +// allocate a fresh page from a segment +static mi_page_t* mi_page_fresh_alloc(mi_heap_t* heap, mi_page_queue_t* pq, size_t block_size) { + mi_assert_internal(pq==NULL||mi_heap_contains_queue(heap, pq)); + mi_page_t* page = _mi_segment_page_alloc(heap, block_size, &heap->tld->segments, &heap->tld->os); + if (page == NULL) { + // this may be out-of-memory, or an abandoned page was reclaimed (and in our queue) + return NULL; + } + mi_assert_internal(pq==NULL || _mi_page_segment(page)->kind != MI_SEGMENT_HUGE); + mi_page_init(heap, page, block_size, heap->tld); + mi_heap_stat_increase(heap, pages, 1); + if (pq!=NULL) mi_page_queue_push(heap, pq, page); // huge pages use pq==NULL + mi_assert_expensive(_mi_page_is_valid(page)); + return page; +} + +// Get a fresh page to use +static mi_page_t* mi_page_fresh(mi_heap_t* heap, mi_page_queue_t* pq) { + mi_assert_internal(mi_heap_contains_queue(heap, pq)); + mi_page_t* page = mi_page_fresh_alloc(heap, pq, pq->block_size); + if (page==NULL) return NULL; + mi_assert_internal(pq->block_size==mi_page_block_size(page)); + mi_assert_internal(pq==mi_page_queue(heap, mi_page_block_size(page))); + return page; +} + +/* ----------------------------------------------------------- + Do any delayed frees + (put there by other threads if they deallocated in a full page) +----------------------------------------------------------- */ +void _mi_heap_delayed_free(mi_heap_t* heap) { + // take over the list (note: no atomic exchange since it is often NULL) + mi_block_t* block = mi_atomic_load_ptr_relaxed(mi_block_t, &heap->thread_delayed_free); + while (block != NULL && !mi_atomic_cas_ptr_weak_acq_rel(mi_block_t, &heap->thread_delayed_free, &block, NULL)) { /* nothing */ }; + + // and free them all + while(block != NULL) { + mi_block_t* next = mi_block_nextx(heap,block, heap->keys); + // use internal free instead of regular one to keep stats etc correct + if (!_mi_free_delayed_block(block)) { + // we might already start delayed freeing while another thread has not yet + // reset the delayed_freeing flag; in that case delay it further by reinserting. + mi_block_t* dfree = mi_atomic_load_ptr_relaxed(mi_block_t, &heap->thread_delayed_free); + do { + mi_block_set_nextx(heap, block, dfree, heap->keys); + } while (!mi_atomic_cas_ptr_weak_release(mi_block_t,&heap->thread_delayed_free, &dfree, block)); + } + block = next; + } +} + +/* ----------------------------------------------------------- + Unfull, abandon, free and retire +----------------------------------------------------------- */ + +// Move a page from the full list back to a regular list +void _mi_page_unfull(mi_page_t* page) { + mi_assert_internal(page != NULL); + mi_assert_expensive(_mi_page_is_valid(page)); + mi_assert_internal(mi_page_is_in_full(page)); + if (!mi_page_is_in_full(page)) return; + + mi_heap_t* heap = mi_page_heap(page); + mi_page_queue_t* pqfull = &heap->pages[MI_BIN_FULL]; + mi_page_set_in_full(page, false); // to get the right queue + mi_page_queue_t* pq = mi_heap_page_queue_of(heap, page); + mi_page_set_in_full(page, true); + mi_page_queue_enqueue_from(pq, pqfull, page); +} + +static void mi_page_to_full(mi_page_t* page, mi_page_queue_t* pq) { + mi_assert_internal(pq == mi_page_queue_of(page)); + mi_assert_internal(!mi_page_immediate_available(page)); + mi_assert_internal(!mi_page_is_in_full(page)); + + if (mi_page_is_in_full(page)) return; + mi_page_queue_enqueue_from(&mi_page_heap(page)->pages[MI_BIN_FULL], pq, page); + _mi_page_free_collect(page,false); // try to collect right away in case another thread freed just before MI_USE_DELAYED_FREE was set +} + + +// Abandon a page with used blocks at the end of a thread. +// Note: only call if it is ensured that no references exist from +// the `page->heap->thread_delayed_free` into this page. +// Currently only called through `mi_heap_collect_ex` which ensures this. +void _mi_page_abandon(mi_page_t* page, mi_page_queue_t* pq) { + mi_assert_internal(page != NULL); + mi_assert_expensive(_mi_page_is_valid(page)); + mi_assert_internal(pq == mi_page_queue_of(page)); + mi_assert_internal(mi_page_heap(page) != NULL); + + mi_heap_t* pheap = mi_page_heap(page); + + // remove from our page list + mi_segments_tld_t* segments_tld = &pheap->tld->segments; + mi_page_queue_remove(pq, page); + + // page is no longer associated with our heap + mi_assert_internal(mi_page_thread_free_flag(page)==MI_NEVER_DELAYED_FREE); + mi_page_set_heap(page, NULL); + +#if MI_DEBUG>1 + // check there are no references left.. + for (mi_block_t* block = (mi_block_t*)pheap->thread_delayed_free; block != NULL; block = mi_block_nextx(pheap, block, pheap->keys)) { + mi_assert_internal(_mi_ptr_page(block) != page); + } +#endif + + // and abandon it + mi_assert_internal(mi_page_heap(page) == NULL); + _mi_segment_page_abandon(page,segments_tld); +} + + +// Free a page with no more free blocks +void _mi_page_free(mi_page_t* page, mi_page_queue_t* pq, bool force) { + mi_assert_internal(page != NULL); + mi_assert_expensive(_mi_page_is_valid(page)); + mi_assert_internal(pq == mi_page_queue_of(page)); + mi_assert_internal(mi_page_all_free(page)); + mi_assert_internal(mi_page_thread_free_flag(page)!=MI_DELAYED_FREEING); + + // no more aligned blocks in here + mi_page_set_has_aligned(page, false); + + mi_heap_t* heap = mi_page_heap(page); + + // remove from the page list + // (no need to do _mi_heap_delayed_free first as all blocks are already free) + mi_segments_tld_t* segments_tld = &heap->tld->segments; + mi_page_queue_remove(pq, page); + + // and free it + mi_page_set_heap(page,NULL); + _mi_segment_page_free(page, force, segments_tld); +} + +// Retire parameters +#define MI_MAX_RETIRE_SIZE MI_MEDIUM_OBJ_SIZE_MAX +#define MI_RETIRE_CYCLES (8) + +// Retire a page with no more used blocks +// Important to not retire too quickly though as new +// allocations might coming. +// Note: called from `mi_free` and benchmarks often +// trigger this due to freeing everything and then +// allocating again so careful when changing this. +void _mi_page_retire(mi_page_t* page) mi_attr_noexcept { + mi_assert_internal(page != NULL); + mi_assert_expensive(_mi_page_is_valid(page)); + mi_assert_internal(mi_page_all_free(page)); + + mi_page_set_has_aligned(page, false); + + // don't retire too often.. + // (or we end up retiring and re-allocating most of the time) + // NOTE: refine this more: we should not retire if this + // is the only page left with free blocks. It is not clear + // how to check this efficiently though... + // for now, we don't retire if it is the only page left of this size class. + mi_page_queue_t* pq = mi_page_queue_of(page); + if (mi_likely(page->xblock_size <= MI_MAX_RETIRE_SIZE && !mi_page_is_in_full(page))) { + if (pq->last==page && pq->first==page) { // the only page in the queue? + mi_stat_counter_increase(_mi_stats_main.page_no_retire,1); + page->retire_expire = 1 + (page->xblock_size <= MI_SMALL_OBJ_SIZE_MAX ? MI_RETIRE_CYCLES : MI_RETIRE_CYCLES/4); + mi_heap_t* heap = mi_page_heap(page); + mi_assert_internal(pq >= heap->pages); + const size_t index = pq - heap->pages; + mi_assert_internal(index < MI_BIN_FULL && index < MI_BIN_HUGE); + if (index < heap->page_retired_min) heap->page_retired_min = index; + if (index > heap->page_retired_max) heap->page_retired_max = index; + mi_assert_internal(mi_page_all_free(page)); + return; // dont't free after all + } + } + _mi_page_free(page, pq, false); +} + +// free retired pages: we don't need to look at the entire queues +// since we only retire pages that are at the head position in a queue. +void _mi_heap_collect_retired(mi_heap_t* heap, bool force) { + size_t min = MI_BIN_FULL; + size_t max = 0; + for(size_t bin = heap->page_retired_min; bin <= heap->page_retired_max; bin++) { + mi_page_queue_t* pq = &heap->pages[bin]; + mi_page_t* page = pq->first; + if (page != NULL && page->retire_expire != 0) { + if (mi_page_all_free(page)) { + page->retire_expire--; + if (force || page->retire_expire == 0) { + _mi_page_free(pq->first, pq, force); + } + else { + // keep retired, update min/max + if (bin < min) min = bin; + if (bin > max) max = bin; + } + } + else { + page->retire_expire = 0; + } + } + } + heap->page_retired_min = min; + heap->page_retired_max = max; +} + + +/* ----------------------------------------------------------- + Initialize the initial free list in a page. + In secure mode we initialize a randomized list by + alternating between slices. +----------------------------------------------------------- */ + +#define MI_MAX_SLICE_SHIFT (6) // at most 64 slices +#define MI_MAX_SLICES (1UL << MI_MAX_SLICE_SHIFT) +#define MI_MIN_SLICES (2) + +static void mi_page_free_list_extend_secure(mi_heap_t* const heap, mi_page_t* const page, const size_t bsize, const size_t extend, mi_stats_t* const stats) { + MI_UNUSED(stats); + #if (MI_SECURE<=2) + mi_assert_internal(page->free == NULL); + mi_assert_internal(page->local_free == NULL); + #endif + mi_assert_internal(page->capacity + extend <= page->reserved); + mi_assert_internal(bsize == mi_page_block_size(page)); + void* const page_area = _mi_page_start(_mi_page_segment(page), page, NULL); + + // initialize a randomized free list + // set up `slice_count` slices to alternate between + size_t shift = MI_MAX_SLICE_SHIFT; + while ((extend >> shift) == 0) { + shift--; + } + const size_t slice_count = (size_t)1U << shift; + const size_t slice_extend = extend / slice_count; + mi_assert_internal(slice_extend >= 1); + mi_block_t* blocks[MI_MAX_SLICES]; // current start of the slice + size_t counts[MI_MAX_SLICES]; // available objects in the slice + for (size_t i = 0; i < slice_count; i++) { + blocks[i] = mi_page_block_at(page, page_area, bsize, page->capacity + i*slice_extend); + counts[i] = slice_extend; + } + counts[slice_count-1] += (extend % slice_count); // final slice holds the modulus too (todo: distribute evenly?) + + // and initialize the free list by randomly threading through them + // set up first element + const uintptr_t r = _mi_heap_random_next(heap); + size_t current = r % slice_count; + counts[current]--; + mi_block_t* const free_start = blocks[current]; + // and iterate through the rest; use `random_shuffle` for performance + uintptr_t rnd = _mi_random_shuffle(r|1); // ensure not 0 + for (size_t i = 1; i < extend; i++) { + // call random_shuffle only every INTPTR_SIZE rounds + const size_t round = i%MI_INTPTR_SIZE; + if (round == 0) rnd = _mi_random_shuffle(rnd); + // select a random next slice index + size_t next = ((rnd >> 8*round) & (slice_count-1)); + while (counts[next]==0) { // ensure it still has space + next++; + if (next==slice_count) next = 0; + } + // and link the current block to it + counts[next]--; + mi_block_t* const block = blocks[current]; + blocks[current] = (mi_block_t*)((uint8_t*)block + bsize); // bump to the following block + mi_block_set_next(page, block, blocks[next]); // and set next; note: we may have `current == next` + current = next; + } + // prepend to the free list (usually NULL) + mi_block_set_next(page, blocks[current], page->free); // end of the list + page->free = free_start; +} + +static mi_decl_noinline void mi_page_free_list_extend( mi_page_t* const page, const size_t bsize, const size_t extend, mi_stats_t* const stats) +{ + MI_UNUSED(stats); + #if (MI_SECURE <= 2) + mi_assert_internal(page->free == NULL); + mi_assert_internal(page->local_free == NULL); + #endif + mi_assert_internal(page->capacity + extend <= page->reserved); + mi_assert_internal(bsize == mi_page_block_size(page)); + void* const page_area = _mi_page_start(_mi_page_segment(page), page, NULL ); + + mi_block_t* const start = mi_page_block_at(page, page_area, bsize, page->capacity); + + // initialize a sequential free list + mi_block_t* const last = mi_page_block_at(page, page_area, bsize, page->capacity + extend - 1); + mi_block_t* block = start; + while(block <= last) { + mi_block_t* next = (mi_block_t*)((uint8_t*)block + bsize); + mi_block_set_next(page,block,next); + block = next; + } + // prepend to free list (usually `NULL`) + mi_block_set_next(page, last, page->free); + page->free = start; +} + +/* ----------------------------------------------------------- + Page initialize and extend the capacity +----------------------------------------------------------- */ + +#define MI_MAX_EXTEND_SIZE (4*1024) // heuristic, one OS page seems to work well. +#if (MI_SECURE>0) +#define MI_MIN_EXTEND (8*MI_SECURE) // extend at least by this many +#else +#define MI_MIN_EXTEND (1) +#endif + +// Extend the capacity (up to reserved) by initializing a free list +// We do at most `MI_MAX_EXTEND` to avoid touching too much memory +// Note: we also experimented with "bump" allocation on the first +// allocations but this did not speed up any benchmark (due to an +// extra test in malloc? or cache effects?) +static void mi_page_extend_free(mi_heap_t* heap, mi_page_t* page, mi_tld_t* tld) { + MI_UNUSED(tld); + mi_assert_expensive(mi_page_is_valid_init(page)); + #if (MI_SECURE<=2) + mi_assert(page->free == NULL); + mi_assert(page->local_free == NULL); + if (page->free != NULL) return; + #endif + if (page->capacity >= page->reserved) return; + + size_t page_size; + _mi_page_start(_mi_page_segment(page), page, &page_size); + mi_stat_counter_increase(tld->stats.pages_extended, 1); + + // calculate the extend count + const size_t bsize = (page->xblock_size < MI_HUGE_BLOCK_SIZE ? page->xblock_size : page_size); + size_t extend = page->reserved - page->capacity; + mi_assert_internal(extend > 0); + + size_t max_extend = (bsize >= MI_MAX_EXTEND_SIZE ? MI_MIN_EXTEND : MI_MAX_EXTEND_SIZE/(uint32_t)bsize); + if (max_extend < MI_MIN_EXTEND) { max_extend = MI_MIN_EXTEND; } + mi_assert_internal(max_extend > 0); + + if (extend > max_extend) { + // ensure we don't touch memory beyond the page to reduce page commit. + // the `lean` benchmark tests this. Going from 1 to 8 increases rss by 50%. + extend = max_extend; + } + + mi_assert_internal(extend > 0 && extend + page->capacity <= page->reserved); + mi_assert_internal(extend < (1UL<<16)); + + // and append the extend the free list + if (extend < MI_MIN_SLICES || MI_SECURE==0) { //!mi_option_is_enabled(mi_option_secure)) { + mi_page_free_list_extend(page, bsize, extend, &tld->stats ); + } + else { + mi_page_free_list_extend_secure(heap, page, bsize, extend, &tld->stats); + } + // enable the new free list + page->capacity += (uint16_t)extend; + mi_stat_increase(tld->stats.page_committed, extend * bsize); + + // extension into zero initialized memory preserves the zero'd free list + if (!page->is_zero_init) { + page->is_zero = false; + } + mi_assert_expensive(mi_page_is_valid_init(page)); +} + +// Initialize a fresh page +static void mi_page_init(mi_heap_t* heap, mi_page_t* page, size_t block_size, mi_tld_t* tld) { + mi_assert(page != NULL); + mi_segment_t* segment = _mi_page_segment(page); + mi_assert(segment != NULL); + mi_assert_internal(block_size > 0); + // set fields + mi_page_set_heap(page, heap); + page->xblock_size = (block_size < MI_HUGE_BLOCK_SIZE ? (uint32_t)block_size : MI_HUGE_BLOCK_SIZE); // initialize before _mi_segment_page_start + size_t page_size; + _mi_segment_page_start(segment, page, &page_size); + mi_assert_internal(mi_page_block_size(page) <= page_size); + mi_assert_internal(page_size <= page->slice_count*MI_SEGMENT_SLICE_SIZE); + mi_assert_internal(page_size / block_size < (1L<<16)); + page->reserved = (uint16_t)(page_size / block_size); + #ifdef MI_ENCODE_FREELIST + page->keys[0] = _mi_heap_random_next(heap); + page->keys[1] = _mi_heap_random_next(heap); + #endif + #if MI_DEBUG > 0 + page->is_zero = false; // ensure in debug mode we initialize with MI_DEBUG_UNINIT, see issue #501 + #else + page->is_zero = page->is_zero_init; + #endif + + mi_assert_internal(page->is_committed); + mi_assert_internal(!page->is_reset); + mi_assert_internal(page->capacity == 0); + mi_assert_internal(page->free == NULL); + mi_assert_internal(page->used == 0); + mi_assert_internal(page->xthread_free == 0); + mi_assert_internal(page->next == NULL); + mi_assert_internal(page->prev == NULL); + mi_assert_internal(page->retire_expire == 0); + mi_assert_internal(!mi_page_has_aligned(page)); + #if (MI_ENCODE_FREELIST) + mi_assert_internal(page->keys[0] != 0); + mi_assert_internal(page->keys[1] != 0); + #endif + mi_assert_expensive(mi_page_is_valid_init(page)); + + // initialize an initial free list + mi_page_extend_free(heap,page,tld); + mi_assert(mi_page_immediate_available(page)); +} + + +/* ----------------------------------------------------------- + Find pages with free blocks +-------------------------------------------------------------*/ + +// Find a page with free blocks of `page->block_size`. +static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* pq, bool first_try) +{ + // search through the pages in "next fit" order + size_t count = 0; + mi_page_t* page = pq->first; + while (page != NULL) + { + mi_page_t* next = page->next; // remember next + count++; + + // 0. collect freed blocks by us and other threads + _mi_page_free_collect(page, false); + + // 1. if the page contains free blocks, we are done + if (mi_page_immediate_available(page)) { + break; // pick this one + } + + // 2. Try to extend + if (page->capacity < page->reserved) { + mi_page_extend_free(heap, page, heap->tld); + mi_assert_internal(mi_page_immediate_available(page)); + break; + } + + // 3. If the page is completely full, move it to the `mi_pages_full` + // queue so we don't visit long-lived pages too often. + mi_assert_internal(!mi_page_is_in_full(page) && !mi_page_immediate_available(page)); + mi_page_to_full(page, pq); + + page = next; + } // for each page + + mi_heap_stat_counter_increase(heap, searches, count); + + if (page == NULL) { + _mi_heap_collect_retired(heap, false); // perhaps make a page available? + page = mi_page_fresh(heap, pq); + if (page == NULL && first_try) { + // out-of-memory _or_ an abandoned page with free blocks was reclaimed, try once again + page = mi_page_queue_find_free_ex(heap, pq, false); + } + } + else { + mi_assert(pq->first == page); + page->retire_expire = 0; + } + mi_assert_internal(page == NULL || mi_page_immediate_available(page)); + return page; +} + + + +// Find a page with free blocks of `size`. +static inline mi_page_t* mi_find_free_page(mi_heap_t* heap, size_t size) { + mi_page_queue_t* pq = mi_page_queue(heap,size); + mi_page_t* page = pq->first; + if (page != NULL) { + #if (MI_SECURE>=3) // in secure mode, we extend half the time to increase randomness + if (page->capacity < page->reserved && ((_mi_heap_random_next(heap) & 1) == 1)) { + mi_page_extend_free(heap, page, heap->tld); + mi_assert_internal(mi_page_immediate_available(page)); + } + else + #endif + { + _mi_page_free_collect(page,false); + } + + if (mi_page_immediate_available(page)) { + page->retire_expire = 0; + return page; // fast path + } + } + return mi_page_queue_find_free_ex(heap, pq, true); +} + + +/* ----------------------------------------------------------- + Users can register a deferred free function called + when the `free` list is empty. Since the `local_free` + is separate this is deterministically called after + a certain number of allocations. +----------------------------------------------------------- */ + +static mi_deferred_free_fun* volatile deferred_free = NULL; +static _Atomic(void*) deferred_arg; // = NULL + +void _mi_deferred_free(mi_heap_t* heap, bool force) { + heap->tld->heartbeat++; + if (deferred_free != NULL && !heap->tld->recurse) { + heap->tld->recurse = true; + deferred_free(force, heap->tld->heartbeat, mi_atomic_load_ptr_relaxed(void,&deferred_arg)); + heap->tld->recurse = false; + } +} + +void mi_register_deferred_free(mi_deferred_free_fun* fn, void* arg) mi_attr_noexcept { + deferred_free = fn; + mi_atomic_store_ptr_release(void,&deferred_arg, arg); +} + + +/* ----------------------------------------------------------- + General allocation +----------------------------------------------------------- */ + +// Large and huge page allocation. +// Huge pages are allocated directly without being in a queue. +// Because huge pages contain just one block, and the segment contains +// just that page, we always treat them as abandoned and any thread +// that frees the block can free the whole page and segment directly. +static mi_page_t* mi_large_huge_page_alloc(mi_heap_t* heap, size_t size) { + size_t block_size = _mi_os_good_alloc_size(size); + mi_assert_internal(mi_bin(block_size) == MI_BIN_HUGE); + bool is_huge = (block_size > MI_LARGE_OBJ_SIZE_MAX); + mi_page_queue_t* pq = (is_huge ? NULL : mi_page_queue(heap, block_size)); + mi_page_t* page = mi_page_fresh_alloc(heap, pq, block_size); + if (page != NULL) { + mi_assert_internal(mi_page_immediate_available(page)); + + if (pq == NULL) { + // huge pages are directly abandoned + mi_assert_internal(_mi_page_segment(page)->kind == MI_SEGMENT_HUGE); + mi_assert_internal(_mi_page_segment(page)->used==1); + mi_assert_internal(_mi_page_segment(page)->thread_id==0); // abandoned, not in the huge queue + mi_page_set_heap(page, NULL); + } + else { + mi_assert_internal(_mi_page_segment(page)->kind != MI_SEGMENT_HUGE); + } + + const size_t bsize = mi_page_usable_block_size(page); // note: not `mi_page_block_size` to account for padding + if (bsize <= MI_LARGE_OBJ_SIZE_MAX) { + mi_heap_stat_increase(heap, large, bsize); + mi_heap_stat_counter_increase(heap, large_count, 1); + } + else { + mi_heap_stat_increase(heap, huge, bsize); + mi_heap_stat_counter_increase(heap, huge_count, 1); + } + } + return page; +} + + +// Allocate a page +// Note: in debug mode the size includes MI_PADDING_SIZE and might have overflowed. +static mi_page_t* mi_find_page(mi_heap_t* heap, size_t size) mi_attr_noexcept { + // huge allocation? + const size_t req_size = size - MI_PADDING_SIZE; // correct for padding_size in case of an overflow on `size` + if (mi_unlikely(req_size > (MI_MEDIUM_OBJ_SIZE_MAX - MI_PADDING_SIZE) )) { + if (mi_unlikely(req_size > PTRDIFF_MAX)) { // we don't allocate more than PTRDIFF_MAX (see ) + _mi_error_message(EOVERFLOW, "allocation request is too large (%zu bytes)\n", req_size); + return NULL; + } + else { + return mi_large_huge_page_alloc(heap,size); + } + } + else { + // otherwise find a page with free blocks in our size segregated queues + mi_assert_internal(size >= MI_PADDING_SIZE); + return mi_find_free_page(heap, size); + } +} + +// Generic allocation routine if the fast path (`alloc.c:mi_page_malloc`) does not succeed. +// Note: in debug mode the size includes MI_PADDING_SIZE and might have overflowed. +void* _mi_malloc_generic(mi_heap_t* heap, size_t size) mi_attr_noexcept +{ + mi_assert_internal(heap != NULL); + + // initialize if necessary + if (mi_unlikely(!mi_heap_is_initialized(heap))) { + mi_thread_init(); // calls `_mi_heap_init` in turn + heap = mi_get_default_heap(); + if (mi_unlikely(!mi_heap_is_initialized(heap))) { return NULL; } + } + mi_assert_internal(mi_heap_is_initialized(heap)); + + // call potential deferred free routines + _mi_deferred_free(heap, false); + + // free delayed frees from other threads + _mi_heap_delayed_free(heap); + + // find (or allocate) a page of the right size + mi_page_t* page = mi_find_page(heap, size); + if (mi_unlikely(page == NULL)) { // first time out of memory, try to collect and retry the allocation once more + mi_heap_collect(heap, true /* force */); + page = mi_find_page(heap, size); + } + + if (mi_unlikely(page == NULL)) { // out of memory + const size_t req_size = size - MI_PADDING_SIZE; // correct for padding_size in case of an overflow on `size` + _mi_error_message(ENOMEM, "unable to allocate memory (%zu bytes)\n", req_size); + return NULL; + } + + mi_assert_internal(mi_page_immediate_available(page)); + mi_assert_internal(mi_page_block_size(page) >= size); + + // and try again, this time succeeding! (i.e. this should never recurse) + return _mi_page_malloc(heap, page, size); +} diff --git a/compat/mimalloc/random.c b/compat/mimalloc/random.c new file mode 100644 index 00000000000000..21d052770dc0dd --- /dev/null +++ b/compat/mimalloc/random.c @@ -0,0 +1,367 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2019-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#ifndef _DEFAULT_SOURCE +#define _DEFAULT_SOURCE // for syscall() on Linux +#endif + +#include "mimalloc.h" +#include "mimalloc-internal.h" + +#include // memset + +/* ---------------------------------------------------------------------------- +We use our own PRNG to keep predictable performance of random number generation +and to avoid implementations that use a lock. We only use the OS provided +random source to initialize the initial seeds. Since we do not need ultimate +performance but we do rely on the security (for secret cookies in secure mode) +we use a cryptographically secure generator (chacha20). +-----------------------------------------------------------------------------*/ + +#define MI_CHACHA_ROUNDS (20) // perhaps use 12 for better performance? + + +/* ---------------------------------------------------------------------------- +Chacha20 implementation as the original algorithm with a 64-bit nonce +and counter: https://en.wikipedia.org/wiki/Salsa20 +The input matrix has sixteen 32-bit values: +Position 0 to 3: constant key +Position 4 to 11: the key +Position 12 to 13: the counter. +Position 14 to 15: the nonce. + +The implementation uses regular C code which compiles very well on modern compilers. +(gcc x64 has no register spills, and clang 6+ uses SSE instructions) +-----------------------------------------------------------------------------*/ + +static inline uint32_t rotl(uint32_t x, uint32_t shift) { + return (x << shift) | (x >> (32 - shift)); +} + +static inline void qround(uint32_t x[16], size_t a, size_t b, size_t c, size_t d) { + x[a] += x[b]; x[d] = rotl(x[d] ^ x[a], 16); + x[c] += x[d]; x[b] = rotl(x[b] ^ x[c], 12); + x[a] += x[b]; x[d] = rotl(x[d] ^ x[a], 8); + x[c] += x[d]; x[b] = rotl(x[b] ^ x[c], 7); +} + +static void chacha_block(mi_random_ctx_t* ctx) +{ + // scramble into `x` + uint32_t x[16]; + for (size_t i = 0; i < 16; i++) { + x[i] = ctx->input[i]; + } + for (size_t i = 0; i < MI_CHACHA_ROUNDS; i += 2) { + qround(x, 0, 4, 8, 12); + qround(x, 1, 5, 9, 13); + qround(x, 2, 6, 10, 14); + qround(x, 3, 7, 11, 15); + qround(x, 0, 5, 10, 15); + qround(x, 1, 6, 11, 12); + qround(x, 2, 7, 8, 13); + qround(x, 3, 4, 9, 14); + } + + // add scrambled data to the initial state + for (size_t i = 0; i < 16; i++) { + ctx->output[i] = x[i] + ctx->input[i]; + } + ctx->output_available = 16; + + // increment the counter for the next round + ctx->input[12] += 1; + if (ctx->input[12] == 0) { + ctx->input[13] += 1; + if (ctx->input[13] == 0) { // and keep increasing into the nonce + ctx->input[14] += 1; + } + } +} + +static uint32_t chacha_next32(mi_random_ctx_t* ctx) { + if (ctx->output_available <= 0) { + chacha_block(ctx); + ctx->output_available = 16; // (assign again to suppress static analysis warning) + } + const uint32_t x = ctx->output[16 - ctx->output_available]; + ctx->output[16 - ctx->output_available] = 0; // reset once the data is handed out + ctx->output_available--; + return x; +} + +static inline uint32_t read32(const uint8_t* p, size_t idx32) { + const size_t i = 4*idx32; + return ((uint32_t)p[i+0] | (uint32_t)p[i+1] << 8 | (uint32_t)p[i+2] << 16 | (uint32_t)p[i+3] << 24); +} + +static void chacha_init(mi_random_ctx_t* ctx, const uint8_t key[32], uint64_t nonce) +{ + // since we only use chacha for randomness (and not encryption) we + // do not _need_ to read 32-bit values as little endian but we do anyways + // just for being compatible :-) + memset(ctx, 0, sizeof(*ctx)); + for (size_t i = 0; i < 4; i++) { + const uint8_t* sigma = (uint8_t*)"expand 32-byte k"; + ctx->input[i] = read32(sigma,i); + } + for (size_t i = 0; i < 8; i++) { + ctx->input[i + 4] = read32(key,i); + } + ctx->input[12] = 0; + ctx->input[13] = 0; + ctx->input[14] = (uint32_t)nonce; + ctx->input[15] = (uint32_t)(nonce >> 32); +} + +static void chacha_split(mi_random_ctx_t* ctx, uint64_t nonce, mi_random_ctx_t* ctx_new) { + memset(ctx_new, 0, sizeof(*ctx_new)); + _mi_memcpy(ctx_new->input, ctx->input, sizeof(ctx_new->input)); + ctx_new->input[12] = 0; + ctx_new->input[13] = 0; + ctx_new->input[14] = (uint32_t)nonce; + ctx_new->input[15] = (uint32_t)(nonce >> 32); + mi_assert_internal(ctx->input[14] != ctx_new->input[14] || ctx->input[15] != ctx_new->input[15]); // do not reuse nonces! + chacha_block(ctx_new); +} + + +/* ---------------------------------------------------------------------------- +Random interface +-----------------------------------------------------------------------------*/ + +#if MI_DEBUG>1 +static bool mi_random_is_initialized(mi_random_ctx_t* ctx) { + return (ctx != NULL && ctx->input[0] != 0); +} +#endif + +void _mi_random_split(mi_random_ctx_t* ctx, mi_random_ctx_t* ctx_new) { + mi_assert_internal(mi_random_is_initialized(ctx)); + mi_assert_internal(ctx != ctx_new); + chacha_split(ctx, (uintptr_t)ctx_new /*nonce*/, ctx_new); +} + +uintptr_t _mi_random_next(mi_random_ctx_t* ctx) { + mi_assert_internal(mi_random_is_initialized(ctx)); + #if MI_INTPTR_SIZE <= 4 + return chacha_next32(ctx); + #elif MI_INTPTR_SIZE == 8 + return (((uintptr_t)chacha_next32(ctx) << 32) | chacha_next32(ctx)); + #else + # error "define mi_random_next for this platform" + #endif +} + + +/* ---------------------------------------------------------------------------- +To initialize a fresh random context we rely on the OS: +- Windows : BCryptGenRandom (or RtlGenRandom) +- macOS : CCRandomGenerateBytes, arc4random_buf +- bsd,wasi : arc4random_buf +- Linux : getrandom,/dev/urandom +If we cannot get good randomness, we fall back to weak randomness based on a timer and ASLR. +-----------------------------------------------------------------------------*/ + +#if defined(_WIN32) + +#if defined(MI_USE_RTLGENRANDOM) || defined(__cplusplus) +// We prefer to use BCryptGenRandom instead of (the unofficial) RtlGenRandom but when using +// dynamic overriding, we observed it can raise an exception when compiled with C++, and +// sometimes deadlocks when also running under the VS debugger. +#pragma comment (lib,"advapi32.lib") +#define RtlGenRandom SystemFunction036 +#ifdef __cplusplus +extern "C" { +#endif +BOOLEAN NTAPI RtlGenRandom(PVOID RandomBuffer, ULONG RandomBufferLength); +#ifdef __cplusplus +} +#endif +static bool os_random_buf(void* buf, size_t buf_len) { + return (RtlGenRandom(buf, (ULONG)buf_len) != 0); +} +#else +#pragma comment (lib,"bcrypt.lib") +#include +static bool os_random_buf(void* buf, size_t buf_len) { + return (BCryptGenRandom(NULL, (PUCHAR)buf, (ULONG)buf_len, BCRYPT_USE_SYSTEM_PREFERRED_RNG) >= 0); +} +#endif + +#elif defined(__APPLE__) +#include +#if defined(MAC_OS_X_VERSION_10_10) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_10 +#include +#include +#endif +static bool os_random_buf(void* buf, size_t buf_len) { + #if defined(MAC_OS_X_VERSION_10_15) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_15 + // We prefere CCRandomGenerateBytes as it returns an error code while arc4random_buf + // may fail silently on macOS. See PR #390, and + return (CCRandomGenerateBytes(buf, buf_len) == kCCSuccess); + #else + // fall back on older macOS + arc4random_buf(buf, buf_len); + return true; + #endif +} + +#elif defined(__ANDROID__) || defined(__DragonFly__) || \ + defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \ + defined(__sun) // todo: what to use with __wasi__? +#include +static bool os_random_buf(void* buf, size_t buf_len) { + arc4random_buf(buf, buf_len); + return true; +} +#elif defined(__linux__) || defined(__HAIKU__) +#if defined(__linux__) +#include +#endif +#include +#include +#include +#include +#include +static bool os_random_buf(void* buf, size_t buf_len) { + // Modern Linux provides `getrandom` but different distributions either use `sys/random.h` or `linux/random.h` + // and for the latter the actual `getrandom` call is not always defined. + // (see ) + // We therefore use a syscall directly and fall back dynamically to /dev/urandom when needed. +#ifdef SYS_getrandom + #ifndef GRND_NONBLOCK + #define GRND_NONBLOCK (1) + #endif + static _Atomic(uintptr_t) no_getrandom; // = 0 + if (mi_atomic_load_acquire(&no_getrandom)==0) { + ssize_t ret = syscall(SYS_getrandom, buf, buf_len, GRND_NONBLOCK); + if (ret >= 0) return (buf_len == (size_t)ret); + if (errno != ENOSYS) return false; + mi_atomic_store_release(&no_getrandom, 1UL); // don't call again, and fall back to /dev/urandom + } +#endif + int flags = O_RDONLY; + #if defined(O_CLOEXEC) + flags |= O_CLOEXEC; + #endif + int fd = open("/dev/urandom", flags, 0); + if (fd < 0) return false; + size_t count = 0; + while(count < buf_len) { + ssize_t ret = read(fd, (char*)buf + count, buf_len - count); + if (ret<=0) { + if (errno!=EAGAIN && errno!=EINTR) break; + } + else { + count += ret; + } + } + close(fd); + return (count==buf_len); +} +#else +static bool os_random_buf(void* buf, size_t buf_len) { + return false; +} +#endif + +#if defined(_WIN32) +#include +#elif defined(__APPLE__) +#include +#else +#include +#endif + +uintptr_t _mi_os_random_weak(uintptr_t extra_seed) { + uintptr_t x = (uintptr_t)&_mi_os_random_weak ^ extra_seed; // ASLR makes the address random + + #if defined(_WIN32) + LARGE_INTEGER pcount; + QueryPerformanceCounter(&pcount); + x ^= (uintptr_t)(pcount.QuadPart); + #elif defined(__APPLE__) + x ^= (uintptr_t)mach_absolute_time(); + #else + struct timespec time; + clock_gettime(CLOCK_MONOTONIC, &time); + x ^= (uintptr_t)time.tv_sec; + x ^= (uintptr_t)time.tv_nsec; + #endif + // and do a few randomization steps + uintptr_t max = ((x ^ (x >> 17)) & 0x0F) + 1; + for (uintptr_t i = 0; i < max; i++) { + x = _mi_random_shuffle(x); + } + mi_assert_internal(x != 0); + return x; +} + +void _mi_random_init(mi_random_ctx_t* ctx) { + uint8_t key[32]; + if (!os_random_buf(key, sizeof(key))) { + // if we fail to get random data from the OS, we fall back to a + // weak random source based on the current time + #if !defined(__wasi__) + _mi_warning_message("unable to use secure randomness\n"); + #endif + uintptr_t x = _mi_os_random_weak(0); + for (size_t i = 0; i < 8; i++) { // key is eight 32-bit words. + x = _mi_random_shuffle(x); + ((uint32_t*)key)[i] = (uint32_t)x; + } + } + chacha_init(ctx, key, (uintptr_t)ctx /*nonce*/ ); +} + +/* -------------------------------------------------------- +test vectors from +----------------------------------------------------------- */ +/* +static bool array_equals(uint32_t* x, uint32_t* y, size_t n) { + for (size_t i = 0; i < n; i++) { + if (x[i] != y[i]) return false; + } + return true; +} +static void chacha_test(void) +{ + uint32_t x[4] = { 0x11111111, 0x01020304, 0x9b8d6f43, 0x01234567 }; + uint32_t x_out[4] = { 0xea2a92f4, 0xcb1cf8ce, 0x4581472e, 0x5881c4bb }; + qround(x, 0, 1, 2, 3); + mi_assert_internal(array_equals(x, x_out, 4)); + + uint32_t y[16] = { + 0x879531e0, 0xc5ecf37d, 0x516461b1, 0xc9a62f8a, + 0x44c20ef3, 0x3390af7f, 0xd9fc690b, 0x2a5f714c, + 0x53372767, 0xb00a5631, 0x974c541a, 0x359e9963, + 0x5c971061, 0x3d631689, 0x2098d9d6, 0x91dbd320 }; + uint32_t y_out[16] = { + 0x879531e0, 0xc5ecf37d, 0xbdb886dc, 0xc9a62f8a, + 0x44c20ef3, 0x3390af7f, 0xd9fc690b, 0xcfacafd2, + 0xe46bea80, 0xb00a5631, 0x974c541a, 0x359e9963, + 0x5c971061, 0xccc07c79, 0x2098d9d6, 0x91dbd320 }; + qround(y, 2, 7, 8, 13); + mi_assert_internal(array_equals(y, y_out, 16)); + + mi_random_ctx_t r = { + { 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574, + 0x03020100, 0x07060504, 0x0b0a0908, 0x0f0e0d0c, + 0x13121110, 0x17161514, 0x1b1a1918, 0x1f1e1d1c, + 0x00000001, 0x09000000, 0x4a000000, 0x00000000 }, + {0}, + 0 + }; + uint32_t r_out[16] = { + 0xe4e7f110, 0x15593bd1, 0x1fdd0f50, 0xc47120a3, + 0xc7f4d1c7, 0x0368c033, 0x9aaa2204, 0x4e6cd4c3, + 0x466482d2, 0x09aa9f07, 0x05d7c214, 0xa2028bd9, + 0xd19c12b5, 0xb94e16de, 0xe883d0cb, 0x4e3c50a2 }; + chacha_block(&r); + mi_assert_internal(array_equals(r.output, r_out, 16)); +} +*/ diff --git a/compat/mimalloc/readme.md b/compat/mimalloc/readme.md new file mode 100644 index 00000000000000..0db3ff6f112ca0 --- /dev/null +++ b/compat/mimalloc/readme.md @@ -0,0 +1,715 @@ + + + +[](https://dev.azure.com/Daan0324/mimalloc/_build?definitionId=1&_a=summary) + +# mimalloc + +  + +mimalloc (pronounced "me-malloc") +is a general purpose allocator with excellent [performance](#performance) characteristics. +Initially developed by Daan Leijen for the run-time systems of the +[Koka](https://koka-lang.github.io) and [Lean](https://github.com/leanprover/lean) languages. + +Latest release tag: `v2.0.6` (2022-04-14). +Latest stable tag: `v1.7.6` (2022-02-14). + +mimalloc is a drop-in replacement for `malloc` and can be used in other programs +without code changes, for example, on dynamically linked ELF-based systems (Linux, BSD, etc.) you can use it as: +``` +> LD_PRELOAD=/usr/lib/libmimalloc.so myprogram +``` +It also has an easy way to override the default allocator in [Windows](#override_on_windows). Notable aspects of the design include: + +- __small and consistent__: the library is about 8k LOC using simple and + consistent data structures. This makes it very suitable + to integrate and adapt in other projects. For runtime systems it + provides hooks for a monotonic _heartbeat_ and deferred freeing (for + bounded worst-case times with reference counting). +- __free list sharding__: instead of one big free list (per size class) we have + many smaller lists per "mimalloc page" which reduces fragmentation and + increases locality -- + things that are allocated close in time get allocated close in memory. + (A mimalloc page contains blocks of one size class and is usually 64KiB on a 64-bit system). +- __free list multi-sharding__: the big idea! Not only do we shard the free list + per mimalloc page, but for each page we have multiple free lists. In particular, there + is one list for thread-local `free` operations, and another one for concurrent `free` + operations. Free-ing from another thread can now be a single CAS without needing + sophisticated coordination between threads. Since there will be + thousands of separate free lists, contention is naturally distributed over the heap, + and the chance of contending on a single location will be low -- this is quite + similar to randomized algorithms like skip lists where adding + a random oracle removes the need for a more complex algorithm. +- __eager page reset__: when a "page" becomes empty (with increased chance + due to free list sharding) the memory is marked to the OS as unused ("reset" or "purged") + reducing (real) memory pressure and fragmentation, especially in long running + programs. +- __secure__: _mimalloc_ can be built in secure mode, adding guard pages, + randomized allocation, encrypted free lists, etc. to protect against various + heap vulnerabilities. The performance penalty is usually around 10% on average + over our benchmarks. +- __first-class heaps__: efficiently create and use multiple heaps to allocate across different regions. + A heap can be destroyed at once instead of deallocating each object separately. +- __bounded__: it does not suffer from _blowup_ \[1\], has bounded worst-case allocation + times (_wcat_), bounded space overhead (~0.2% meta-data, with low internal fragmentation), + and has no internal points of contention using only atomic operations. +- __fast__: In our benchmarks (see [below](#performance)), + _mimalloc_ outperforms other leading allocators (_jemalloc_, _tcmalloc_, _Hoard_, etc), + and often uses less memory. A nice property + is that it does consistently well over a wide range of benchmarks. There is also good huge OS page + support for larger server programs. + +The [documentation](https://microsoft.github.io/mimalloc) gives a full overview of the API. +You can read more on the design of _mimalloc_ in the [technical report](https://www.microsoft.com/en-us/research/publication/mimalloc-free-list-sharding-in-action) which also has detailed benchmark results. + +Enjoy! + +### Branches + +* `master`: latest stable release (based on `dev-slice`). +* `dev`: development branch for mimalloc v1. Use this branch for submitting PR's. +* `dev-slice`: development branch for mimalloc v2. This branch is downstream of `dev`. + +### Releases + +Note: the `v2.x` version has a new algorithm for managing internal mimalloc pages that tends to use reduce memory usage + and fragmentation compared to mimalloc `v1.x` (especially for large workloads). Should otherwise have similar performance + (see [below](#performance)); please report if you observe any significant performance regression. + +* 2022-04-14, `v1.7.6`, `v2.0.6`: fix fallback path for aligned OS allocation on Windows, improve Windows aligned allocation + even when compiling with older SDK's, fix dynamic overriding on macOS Monterey, fix MSVC C++ dynamic overriding, fix + warnings under Clang 14, improve performance if many OS threads are created and destroyed, fix statistics for large object + allocations, using MIMALLOC_VERBOSE=1 has no maximum on the number of error messages, various small fixes. + +* 2022-02-14, `v1.7.5`, `v2.0.5` (alpha): fix malloc override on + Windows 11, fix compilation with musl, potentially reduced + committed memory, add `bin/minject` for Windows, + improved wasm support, faster aligned allocation, + various small fixes. + +* 2021-11-14, `v1.7.3`, `v2.0.3` (beta): improved WASM support, improved macOS support and performance (including + M1), improved performance for v2 for large objects, Python integration improvements, more standard + installation directories, various small fixes. + +* 2021-06-17, `v1.7.2`, `v2.0.2` (beta): support M1, better installation layout on Linux, fix + thread_id on Android, prefer 2-6TiB area for aligned allocation to work better on pre-windows 8, various small fixes. + +* 2021-04-06, `v1.7.1`, `v2.0.1` (beta): fix bug in arena allocation for huge pages, improved aslr on large allocations, initial M1 support (still experimental). + +* 2021-01-31, `v2.0.0`: beta release 2.0: new slice algorithm for managing internal mimalloc pages. + +* 2021-01-31, `v1.7.0`: stable release 1.7: support explicit user provided memory regions, more precise statistics, + improve macOS overriding, initial support for Apple M1, improved DragonFly support, faster memcpy on Windows, various small fixes. + +* [Older release notes](#older-release-notes) + +Special thanks to: + +* [David Carlier](https://devnexen.blogspot.com/) (@devnexen) for his many contributions, and making + mimalloc work better on many less common operating systems, like Haiku, Dragonfly, etc. +* Mary Feofanova (@mary3000), Evgeniy Moiseenko, and Manuel Pöter (@mpoeter) for making mimalloc TSAN checkable, and finding + memory model bugs using the [genMC] model checker. +* Weipeng Liu (@pongba), Zhuowei Li, Junhua Wang, and Jakub Szymanski, for their early support of mimalloc and deployment + at large scale services, leading to many improvements in the mimalloc algorithms for large workloads. +* Jason Gibson (@jasongibson) for exhaustive testing on large scale workloads and server environments, and finding complex bugs + in (early versions of) `mimalloc`. +* Manuel Pöter (@mpoeter) and Sam Gross(@colesbury) for finding an ABA concurrency issue in abandoned segment reclamation. Sam also created the [no GIL](https://github.com/colesbury/nogil) Python fork which + uses mimalloc internally. + + +[genMC]: https://plv.mpi-sws.org/genmc/ + +### Usage + +mimalloc is used in various large scale low-latency services and programs, for example: + + + + + + + + +# Building + +## Windows + +Open `ide/vs2019/mimalloc.sln` in Visual Studio 2019 and build. +The `mimalloc` project builds a static library (in `out/msvc-x64`), while the +`mimalloc-override` project builds a DLL for overriding malloc +in the entire program. + +## macOS, Linux, BSD, etc. + +We use [`cmake`](https://cmake.org)1 as the build system: + +``` +> mkdir -p out/release +> cd out/release +> cmake ../.. +> make +``` +This builds the library as a shared (dynamic) +library (`.so` or `.dylib`), a static library (`.a`), and +as a single object file (`.o`). + +`> sudo make install` (install the library and header files in `/usr/local/lib` and `/usr/local/include`) + +You can build the debug version which does many internal checks and +maintains detailed statistics as: + +``` +> mkdir -p out/debug +> cd out/debug +> cmake -DCMAKE_BUILD_TYPE=Debug ../.. +> make +``` +This will name the shared library as `libmimalloc-debug.so`. + +Finally, you can build a _secure_ version that uses guard pages, encrypted +free lists, etc., as: +``` +> mkdir -p out/secure +> cd out/secure +> cmake -DMI_SECURE=ON ../.. +> make +``` +This will name the shared library as `libmimalloc-secure.so`. +Use `ccmake`2 instead of `cmake` +to see and customize all the available build options. + +Notes: +1. Install CMake: `sudo apt-get install cmake` +2. Install CCMake: `sudo apt-get install cmake-curses-gui` + + +## Single source + +You can also directly build the single `src/static.c` file as part of your project without +needing `cmake` at all. Make sure to also add the mimalloc `include` directory to the include path. + + +# Using the library + +The preferred usage is including ``, linking with +the shared- or static library, and using the `mi_malloc` API exclusively for allocation. For example, +``` +> gcc -o myprogram -lmimalloc myfile.c +``` + +mimalloc uses only safe OS calls (`mmap` and `VirtualAlloc`) and can co-exist +with other allocators linked to the same program. +If you use `cmake`, you can simply use: +``` +find_package(mimalloc 1.4 REQUIRED) +``` +in your `CMakeLists.txt` to find a locally installed mimalloc. Then use either: +``` +target_link_libraries(myapp PUBLIC mimalloc) +``` +to link with the shared (dynamic) library, or: +``` +target_link_libraries(myapp PUBLIC mimalloc-static) +``` +to link with the static library. See `test\CMakeLists.txt` for an example. + +For best performance in C++ programs, it is also recommended to override the +global `new` and `delete` operators. For convience, mimalloc provides +[`mimalloc-new-delete.h`](https://github.com/microsoft/mimalloc/blob/master/include/mimalloc-new-delete.h) which does this for you -- just include it in a single(!) source file in your project. +In C++, mimalloc also provides the `mi_stl_allocator` struct which implements the `std::allocator` +interface. + +You can pass environment variables to print verbose messages (`MIMALLOC_VERBOSE=1`) +and statistics (`MIMALLOC_SHOW_STATS=1`) (in the debug version): +``` +> env MIMALLOC_SHOW_STATS=1 ./cfrac 175451865205073170563711388363 + +175451865205073170563711388363 = 374456281610909315237213 * 468551 + +heap stats: peak total freed unit +normal 2: 16.4 kb 17.5 mb 17.5 mb 16 b ok +normal 3: 16.3 kb 15.2 mb 15.2 mb 24 b ok +normal 4: 64 b 4.6 kb 4.6 kb 32 b ok +normal 5: 80 b 118.4 kb 118.4 kb 40 b ok +normal 6: 48 b 48 b 48 b 48 b ok +normal 17: 960 b 960 b 960 b 320 b ok + +heap stats: peak total freed unit + normal: 33.9 kb 32.8 mb 32.8 mb 1 b ok + huge: 0 b 0 b 0 b 1 b ok + total: 33.9 kb 32.8 mb 32.8 mb 1 b ok +malloc requested: 32.8 mb + + committed: 58.2 kb 58.2 kb 58.2 kb 1 b ok + reserved: 2.0 mb 2.0 mb 2.0 mb 1 b ok + reset: 0 b 0 b 0 b 1 b ok + segments: 1 1 1 +-abandoned: 0 + pages: 6 6 6 +-abandoned: 0 + mmaps: 3 + mmap fast: 0 + mmap slow: 1 + threads: 0 + elapsed: 2.022s + process: user: 1.781s, system: 0.016s, faults: 756, reclaims: 0, rss: 2.7 mb +``` + +The above model of using the `mi_` prefixed API is not always possible +though in existing programs that already use the standard malloc interface, +and another option is to override the standard malloc interface +completely and redirect all calls to the _mimalloc_ library instead . + +## Environment Options + +You can set further options either programmatically (using [`mi_option_set`](https://microsoft.github.io/mimalloc/group__options.html)), +or via environment variables: + +- `MIMALLOC_SHOW_STATS=1`: show statistics when the program terminates. +- `MIMALLOC_VERBOSE=1`: show verbose messages. +- `MIMALLOC_SHOW_ERRORS=1`: show error and warning messages. +- `MIMALLOC_PAGE_RESET=0`: by default, mimalloc will reset (or purge) OS pages that are not in use, to signal to the OS + that the underlying physical memory can be reused. This can reduce memory fragmentation in long running (server) + programs. By setting it to `0` this will no longer be done which can improve performance for batch-like programs. + As an alternative, the `MIMALLOC_RESET_DELAY=` can be set higher (100ms by default) to make the page + reset occur less frequently instead of turning it off completely. +- `MIMALLOC_USE_NUMA_NODES=N`: pretend there are at most `N` NUMA nodes. If not set, the actual NUMA nodes are detected + at runtime. Setting `N` to 1 may avoid problems in some virtual environments. Also, setting it to a lower number than + the actual NUMA nodes is fine and will only cause threads to potentially allocate more memory across actual NUMA + nodes (but this can happen in any case as NUMA local allocation is always a best effort but not guaranteed). +- `MIMALLOC_LARGE_OS_PAGES=1`: use large OS pages (2MiB) when available; for some workloads this can significantly + improve performance. Use `MIMALLOC_VERBOSE` to check if the large OS pages are enabled -- usually one needs + to explicitly allow large OS pages (as on [Windows][windows-huge] and [Linux][linux-huge]). However, sometimes + the OS is very slow to reserve contiguous physical memory for large OS pages so use with care on systems that + can have fragmented memory (for that reason, we generally recommend to use `MIMALLOC_RESERVE_HUGE_OS_PAGES` instead whenever possible). + +- `MIMALLOC_RESERVE_HUGE_OS_PAGES=N`: where N is the number of 1GiB _huge_ OS pages. This reserves the huge pages at + startup and sometimes this can give a large (latency) performance improvement on big workloads. + Usually it is better to not use + `MIMALLOC_LARGE_OS_PAGES` in combination with this setting. Just like large OS pages, use with care as reserving + contiguous physical memory can take a long time when memory is fragmented (but reserving the huge pages is done at + startup only once). + Note that we usually need to explicitly enable huge OS pages (as on [Windows][windows-huge] and [Linux][linux-huge])). + With huge OS pages, it may be beneficial to set the setting + `MIMALLOC_EAGER_COMMIT_DELAY=N` (`N` is 1 by default) to delay the initial `N` segments (of 4MiB) + of a thread to not allocate in the huge OS pages; this prevents threads that are short lived + and allocate just a little to take up space in the huge OS page area (which cannot be reset). + The huge pages are usually allocated evenly among NUMA nodes. + We can use `MIMALLOC_RESERVE_HUGE_OS_PAGES_AT=N` where `N` is the numa node (starting at 0) to allocate all + the huge pages at a specific numa node instead. + +Use caution when using `fork` in combination with either large or huge OS pages: on a fork, the OS uses copy-on-write +for all pages in the original process including the huge OS pages. When any memory is now written in that area, the +OS will copy the entire 1GiB huge page (or 2MiB large page) which can cause the memory usage to grow in large increments. + +[linux-huge]: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/sect-oracle_9i_and_10g_tuning_guide-large_memory_optimization_big_pages_and_huge_pages-configuring_huge_pages_in_red_hat_enterprise_linux_4_or_5 +[windows-huge]: https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/enable-the-lock-pages-in-memory-option-windows?view=sql-server-2017 + +## Secure Mode + +_mimalloc_ can be build in secure mode by using the `-DMI_SECURE=ON` flags in `cmake`. This build enables various mitigations +to make mimalloc more robust against exploits. In particular: + +- All internal mimalloc pages are surrounded by guard pages and the heap metadata is behind a guard page as well (so a buffer overflow + exploit cannot reach into the metadata). +- All free list pointers are + [encoded](https://github.com/microsoft/mimalloc/blob/783e3377f79ee82af43a0793910a9f2d01ac7863/include/mimalloc-internal.h#L396) + with per-page keys which is used both to prevent overwrites with a known pointer, as well as to detect heap corruption. +- Double free's are detected (and ignored). +- The free lists are initialized in a random order and allocation randomly chooses between extension and reuse within a page to + mitigate against attacks that rely on a predicable allocation order. Similarly, the larger heap blocks allocated by mimalloc + from the OS are also address randomized. + +As always, evaluate with care as part of an overall security strategy as all of the above are mitigations but not guarantees. + +## Debug Mode + +When _mimalloc_ is built using debug mode, various checks are done at runtime to catch development errors. + +- Statistics are maintained in detail for each object size. They can be shown using `MIMALLOC_SHOW_STATS=1` at runtime. +- All objects have padding at the end to detect (byte precise) heap block overflows. +- Double free's, and freeing invalid heap pointers are detected. +- Corrupted free-lists and some forms of use-after-free are detected. + + +# Overriding Standard Malloc + +Overriding the standard `malloc` (and `new`) can be done either _dynamically_ or _statically_. + +## Dynamic override + +This is the recommended way to override the standard malloc interface. + +### Override on Linux, BSD + +On these ELF-based systems we preload the mimalloc shared +library so all calls to the standard `malloc` interface are +resolved to the _mimalloc_ library. +``` +> env LD_PRELOAD=/usr/lib/libmimalloc.so myprogram +``` + +You can set extra environment variables to check that mimalloc is running, +like: +``` +> env MIMALLOC_VERBOSE=1 LD_PRELOAD=/usr/lib/libmimalloc.so myprogram +``` +or run with the debug version to get detailed statistics: +``` +> env MIMALLOC_SHOW_STATS=1 LD_PRELOAD=/usr/lib/libmimalloc-debug.so myprogram +``` + +### Override on MacOS + +On macOS we can also preload the mimalloc shared +library so all calls to the standard `malloc` interface are +resolved to the _mimalloc_ library. +``` +> env DYLD_INSERT_LIBRARIES=/usr/lib/libmimalloc.dylib myprogram +``` + +Note that certain security restrictions may apply when doing this from +the [shell](https://stackoverflow.com/questions/43941322/dyld-insert-libraries-ignored-when-calling-application-through-bash). + + +### Override on Windows + +Overriding on Windows is robust and has the +particular advantage to be able to redirect all malloc/free calls that go through +the (dynamic) C runtime allocator, including those from other DLL's or libraries. + +The overriding on Windows requires that you link your program explicitly with +the mimalloc DLL and use the C-runtime library as a DLL (using the `/MD` or `/MDd` switch). +Also, the `mimalloc-redirect.dll` (or `mimalloc-redirect32.dll`) must be put +in the same folder as the main `mimalloc-override.dll` at runtime (as it is a dependency). +The redirection DLL ensures that all calls to the C runtime malloc API get redirected to +mimalloc (in `mimalloc-override.dll`). + +To ensure the mimalloc DLL is loaded at run-time it is easiest to insert some +call to the mimalloc API in the `main` function, like `mi_version()` +(or use the `/INCLUDE:mi_version` switch on the linker). See the `mimalloc-override-test` project +for an example on how to use this. For best performance on Windows with C++, it +is also recommended to also override the `new`/`delete` operations (by including +[`mimalloc-new-delete.h`](https://github.com/microsoft/mimalloc/blob/master/include/mimalloc-new-delete.h) a single(!) source file in your project). + +The environment variable `MIMALLOC_DISABLE_REDIRECT=1` can be used to disable dynamic +overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc was successfully redirected. + +(Note: in principle, it is possible to even patch existing executables without any recompilation +if they are linked with the dynamic C runtime (`ucrtbase.dll`) -- just put the `mimalloc-override.dll` +into the import table (and put `mimalloc-redirect.dll` in the same folder) +Such patching can be done for example with [CFF Explorer](https://ntcore.com/?page_id=388)). + + +## Static override + +On Unix-like systems, you can also statically link with _mimalloc_ to override the standard +malloc interface. The recommended way is to link the final program with the +_mimalloc_ single object file (`mimalloc-override.o`). We use +an object file instead of a library file as linkers give preference to +that over archives to resolve symbols. To ensure that the standard +malloc interface resolves to the _mimalloc_ library, link it as the first +object file. For example: +``` +> gcc -o myprogram mimalloc-override.o myfile1.c ... +``` + +Another way to override statically that works on all platforms, is to +link statically to mimalloc (as shown in the introduction) and include a +header file in each source file that re-defines `malloc` etc. to `mi_malloc`. +This is provided by [`mimalloc-override.h`](https://github.com/microsoft/mimalloc/blob/master/include/mimalloc-override.h). This only works reliably though if all sources are +under your control or otherwise mixing of pointers from different heaps may occur! + + +# Performance + +Last update: 2021-01-30 + +We tested _mimalloc_ against many other top allocators over a wide +range of benchmarks, ranging from various real world programs to +synthetic benchmarks that see how the allocator behaves under more +extreme circumstances. In our benchmark suite, _mimalloc_ outperforms other leading +allocators (_jemalloc_, _tcmalloc_, _Hoard_, etc), and has a similar memory footprint. A nice property is that it +does consistently well over the wide range of benchmarks. + +General memory allocators are interesting as there exists no algorithm that is +optimal -- for a given allocator one can usually construct a workload +where it does not do so well. The goal is thus to find an allocation +strategy that performs well over a wide range of benchmarks without +suffering from (too much) underperformance in less common situations. + +As always, interpret these results with care since some benchmarks test synthetic +or uncommon situations that may never apply to your workloads. For example, most +allocators do not do well on `xmalloc-testN` but that includes even the best +industrial allocators like _jemalloc_ and _tcmalloc_ that are used in some of +the world's largest systems (like Chrome or FreeBSD). + +Also, the benchmarks here do not measure the behaviour on very large and long-running server workloads, +or worst-case latencies of allocation. Much work has gone into `mimalloc` to work well on such +workloads (for example, to reduce virtual memory fragmentation on long-running services) +but such optimizations are not always reflected in the current benchmark suite. + +We show here only an overview -- for +more specific details and further benchmarks we refer to the +[technical report](https://www.microsoft.com/en-us/research/publication/mimalloc-free-list-sharding-in-action). +The benchmark suite is automated and available separately +as [mimalloc-bench](https://github.com/daanx/mimalloc-bench). + + +## Benchmark Results on a 16-core AMD 5950x (Zen3) + +Testing on the 16-core AMD 5950x processor at 3.4Ghz (4.9Ghz boost), with +with 32GiB memory at 3600Mhz, running Ubuntu 20.04 with glibc 2.31 and GCC 9.3.0. + +We measure three versions of _mimalloc_: the main version `mi` (tag:v1.7.0), +the new v2.0 beta version as `xmi` (tag:v2.0.0), and the main version in secure mode as `smi` (tag:v1.7.0). + +The other allocators are +Google's [_tcmalloc_](https://github.com/gperftools/gperftools) (`tc`, tag:gperftools-2.8.1) used in Chrome, +Facebook's [_jemalloc_](https://github.com/jemalloc/jemalloc) (`je`, tag:5.2.1) by Jason Evans used in Firefox and FreeBSD, +the Intel thread building blocks [allocator](https://github.com/intel/tbb) (`tbb`, tag:v2020.3), +[rpmalloc](https://github.com/mjansson/rpmalloc) (`rp`,tag:1.4.1) by Mattias Jansson, +the original scalable [_Hoard_](https://github.com/emeryberger/Hoard) (git:d880f72) allocator by Emery Berger \[1], +the memory compacting [_Mesh_](https://github.com/plasma-umass/Mesh) (git:67ff31a) allocator by +Bobby Powers _et al_ \[8], +and finally the default system allocator (`glibc`, 2.31) (based on _PtMalloc2_). + + + + +Any benchmarks ending in `N` run on all 32 logical cores in parallel. +Results are averaged over 10 runs and reported relative +to mimalloc (where 1.2 means it took 1.2× longer to run). +The legend also contains the _overall relative score_ between the +allocators where 100 points is the maximum if an allocator is fastest on +all benchmarks. + +The single threaded _cfrac_ benchmark by Dave Barrett is an implementation of +continued fraction factorization which uses many small short-lived allocations. +All allocators do well on such common usage, where _mimalloc_ is just a tad +faster than _tcmalloc_ and +_jemalloc_. + +The _leanN_ program is interesting as a large realistic and +concurrent workload of the [Lean](https://github.com/leanprover/lean) +theorem prover compiling its own standard library, and there is a 13% +speedup over _tcmalloc_. This is +quite significant: if Lean spends 20% of its time in the +allocator that means that _mimalloc_ is 1.6× faster than _tcmalloc_ +here. (This is surprising as that is not measured in a pure +allocation benchmark like _alloc-test_. We conjecture that we see this +outsized improvement here because _mimalloc_ has better locality in +the allocation which improves performance for the *other* computations +in a program as well). + +The single threaded _redis_ benchmark again show that most allocators do well on such workloads. + +The _larsonN_ server benchmark by Larson and Krishnan \[2] allocates and frees between threads. They observed this +behavior (which they call _bleeding_) in actual server applications, and the benchmark simulates this. +Here, _mimalloc_ is quite a bit faster than _tcmalloc_ and _jemalloc_ probably due to the object migration between different threads. + +The _mstressN_ workload performs many allocations and re-allocations, +and migrates objects between threads (as in _larsonN_). However, it also +creates and destroys the _N_ worker threads a few times keeping some objects +alive beyond the life time of the allocating thread. We observed this +behavior in many larger server applications. + +The [_rptestN_](https://github.com/mjansson/rpmalloc-benchmark) benchmark +by Mattias Jansson is a allocator test originally designed +for _rpmalloc_, and tries to simulate realistic allocation patterns over +multiple threads. Here the differences between allocators become more apparent. + +The second benchmark set tests specific aspects of the allocators and +shows even more extreme differences between them. + +The _alloc-test_, by +[OLogN Technologies AG](http://ithare.com/testing-memory-allocators-ptmalloc2-tcmalloc-hoard-jemalloc-while-trying-to-simulate-real-world-loads/), is a very allocation intensive benchmark doing millions of +allocations in various size classes. The test is scaled such that when an +allocator performs almost identically on _alloc-test1_ as _alloc-testN_ it +means that it scales linearly. + +The _sh6bench_ and _sh8bench_ benchmarks are +developed by [MicroQuill](http://www.microquill.com/) as part of SmartHeap. +In _sh6bench_ _mimalloc_ does much +better than the others (more than 2.5× faster than _jemalloc_). +We cannot explain this well but believe it is +caused in part by the "reverse" free-ing pattern in _sh6bench_. +The _sh8bench_ is a variation with object migration +between threads; whereas _tcmalloc_ did well on _sh6bench_, the addition of object migration causes it to be 10× slower than before. + +The _xmalloc-testN_ benchmark by Lever and Boreham \[5] and Christian Eder, simulates an asymmetric workload where +some threads only allocate, and others only free -- they observed this pattern in +larger server applications. Here we see that +the _mimalloc_ technique of having non-contended sharded thread free +lists pays off as it outperforms others by a very large margin. Only _rpmalloc_, _tbb_, and _glibc_ also scale well on this benchmark. + +The _cache-scratch_ benchmark by Emery Berger \[1], and introduced with +the Hoard allocator to test for _passive-false_ sharing of cache lines. +With a single thread they all +perform the same, but when running with multiple threads the potential allocator +induced false sharing of the cache lines can cause large run-time differences. +Crundal \[6] describes in detail why the false cache line sharing occurs in the _tcmalloc_ design, and also discusses how this +can be avoided with some small implementation changes. +Only the _tbb_, _rpmalloc_ and _mesh_ allocators also avoid the +cache line sharing completely, while _Hoard_ and _glibc_ seem to mitigate +the effects. Kukanov and Voss \[7] describe in detail +how the design of _tbb_ avoids the false cache line sharing. + + +## On a 36-core Intel Xeon + +For completeness, here are the results on a big Amazon +[c5.18xlarge](https://aws.amazon.com/ec2/instance-types/#Compute_Optimized) instance +consisting of a 2×18-core Intel Xeon (Cascade Lake) at 3.4GHz (boost 3.5GHz) +with 144GiB ECC memory, running Ubuntu 20.04 with glibc 2.31, GCC 9.3.0, and +Clang 10.0.0. This time, the mimalloc allocators (mi, xmi, and smi) were +compiled with the Clang compiler instead of GCC. +The results are similar to the AMD results but it is interesting to +see the differences in the _larsonN_, _mstressN_, and _xmalloc-testN_ benchmarks. + + + + + +## Peak Working Set + +The following figure shows the peak working set (rss) of the allocators +on the benchmarks (on the c5.18xlarge instance). + + + + +Note that the _xmalloc-testN_ memory usage should be disregarded as it +allocates more the faster the program runs. Similarly, memory usage of +_larsonN_, _mstressN_, _rptestN_ and _sh8bench_ can vary depending on scheduling and +speed. Nevertheless, we hope to improve the memory usage on _mstressN_ +and _rptestN_ (just as _cfrac_, _larsonN_ and _sh8bench_ have a small working set which skews the results). + + + + +# References + +- \[1] Emery D. Berger, Kathryn S. McKinley, Robert D. Blumofe, and Paul R. Wilson. + _Hoard: A Scalable Memory Allocator for Multithreaded Applications_ + the Ninth International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS-IX). Cambridge, MA, November 2000. + [pdf](http://www.cs.utexas.edu/users/mckinley/papers/asplos-2000.pdf) + +- \[2] P. Larson and M. Krishnan. _Memory allocation for long-running server applications_. + In ISMM, Vancouver, B.C., Canada, 1998. [pdf](http://citeseer.ist.psu.edu/viewdoc/download?doi=10.1.1.45.1947&rep=rep1&type=pdf) + +- \[3] D. Grunwald, B. Zorn, and R. Henderson. + _Improving the cache locality of memory allocation_. In R. Cartwright, editor, + Proceedings of the Conference on Programming Language Design and Implementation, pages 177–186, New York, NY, USA, June 1993. [pdf](http://citeseer.ist.psu.edu/viewdoc/download?doi=10.1.1.43.6621&rep=rep1&type=pdf) + +- \[4] J. Barnes and P. Hut. _A hierarchical O(n*log(n)) force-calculation algorithm_. Nature, 324:446-449, 1986. + +- \[5] C. Lever, and D. Boreham. _Malloc() Performance in a Multithreaded Linux Environment._ + In USENIX Annual Technical Conference, Freenix Session. San Diego, CA. Jun. 2000. + Available at + +- \[6] Timothy Crundal. _Reducing Active-False Sharing in TCMalloc_. 2016. CS16S1 project at the Australian National University. [pdf](http://courses.cecs.anu.edu.au/courses/CSPROJECTS/16S1/Reports/Timothy_Crundal_Report.pdf) + +- \[7] Alexey Kukanov, and Michael J Voss. + _The Foundations for Scalable Multi-Core Software in Intel Threading Building Blocks._ + Intel Technology Journal 11 (4). 2007 + +- \[8] Bobby Powers, David Tench, Emery D. Berger, and Andrew McGregor. + _Mesh: Compacting Memory Management for C/C++_ + In Proceedings of the 40th ACM SIGPLAN Conference on Programming Language Design and Implementation (PLDI'19), June 2019, pages 333-–346. + + + +# Contributing + +This project welcomes contributions and suggestions. Most contributions require you to agree to a +Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us +the rights to use your contribution. For details, visit https://cla.microsoft.com. + +When you submit a pull request, a CLA-bot will automatically determine whether you need to provide +a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions +provided by the bot. You will only need to do this once across all repos using our CLA. + + +# Older Release Notes + +* 2020-09-24, `v1.6.7`: stable release 1.6: using standard C atomics, passing tsan testing, improved + handling of failing to commit on Windows, add [`mi_process_info`](https://github.com/microsoft/mimalloc/blob/master/include/mimalloc.h#L156) api call. +* 2020-08-06, `v1.6.4`: stable release 1.6: improved error recovery in low-memory situations, + support for IllumOS and Haiku, NUMA support for Vista/XP, improved NUMA detection for AMD Ryzen, ubsan support. +* 2020-05-05, `v1.6.3`: stable release 1.6: improved behavior in out-of-memory situations, improved malloc zones on macOS, + build PIC static libraries by default, add option to abort on out-of-memory, line buffered statistics. +* 2020-04-20, `v1.6.2`: stable release 1.6: fix compilation on Android, MingW, Raspberry, and Conda, + stability fix for Windows 7, fix multiple mimalloc instances in one executable, fix `strnlen` overload, + fix aligned debug padding. +* 2020-02-17, `v1.6.1`: stable release 1.6: minor updates (build with clang-cl, fix alignment issue for small objects). +* 2020-02-09, `v1.6.0`: stable release 1.6: fixed potential memory leak, improved overriding + and thread local support on FreeBSD, NetBSD, DragonFly, and macOSX. New byte-precise + heap block overflow detection in debug mode (besides the double-free detection and free-list + corruption detection). Add `nodiscard` attribute to most allocation functions. + Enable `MIMALLOC_PAGE_RESET` by default. New reclamation strategy for abandoned heap pages + for better memory footprint. +* 2020-02-09, `v1.5.0`: stable release 1.5: improved free performance, small bug fixes. +* 2020-01-22, `v1.4.0`: stable release 1.4: improved performance for delayed OS page reset, +more eager concurrent free, addition of STL allocator, fixed potential memory leak. +* 2020-01-15, `v1.3.0`: stable release 1.3: bug fixes, improved randomness and [stronger +free list encoding](https://github.com/microsoft/mimalloc/blob/783e3377f79ee82af43a0793910a9f2d01ac7863/include/mimalloc-internal.h#L396) in secure mode. +* 2019-12-22, `v1.2.2`: stable release 1.2: minor updates. +* 2019-11-22, `v1.2.0`: stable release 1.2: bug fixes, improved secure mode (free list corruption checks, double free mitigation). Improved dynamic overriding on Windows. +* 2019-10-07, `v1.1.0`: stable release 1.1. +* 2019-09-01, `v1.0.8`: pre-release 8: more robust windows dynamic overriding, initial huge page support. +* 2019-08-10, `v1.0.6`: pre-release 6: various performance improvements. diff --git a/compat/mimalloc/segment-cache.c b/compat/mimalloc/segment-cache.c new file mode 100644 index 00000000000000..c071239ce32bee --- /dev/null +++ b/compat/mimalloc/segment-cache.c @@ -0,0 +1,360 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2020, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ + +/* ---------------------------------------------------------------------------- + Implements a cache of segments to avoid expensive OS calls and to reuse + the commit_mask to optimize the commit/decommit calls. + The full memory map of all segments is also implemented here. +-----------------------------------------------------------------------------*/ +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include "bitmap.h" // atomic bitmap + +//#define MI_CACHE_DISABLE 1 // define to completely disable the segment cache + +#define MI_CACHE_FIELDS (16) +#define MI_CACHE_MAX (MI_BITMAP_FIELD_BITS*MI_CACHE_FIELDS) // 1024 on 64-bit + +#define BITS_SET() MI_ATOMIC_VAR_INIT(UINTPTR_MAX) +#define MI_CACHE_BITS_SET MI_INIT16(BITS_SET) // note: update if MI_CACHE_FIELDS changes + +typedef struct mi_cache_slot_s { + void* p; + size_t memid; + bool is_pinned; + mi_commit_mask_t commit_mask; + mi_commit_mask_t decommit_mask; + _Atomic(mi_msecs_t) expire; +} mi_cache_slot_t; + +static mi_decl_cache_align mi_cache_slot_t cache[MI_CACHE_MAX]; // = 0 + +static mi_decl_cache_align mi_bitmap_field_t cache_available[MI_CACHE_FIELDS] = { MI_CACHE_BITS_SET }; // zero bit = available! +static mi_decl_cache_align mi_bitmap_field_t cache_available_large[MI_CACHE_FIELDS] = { MI_CACHE_BITS_SET }; +static mi_decl_cache_align mi_bitmap_field_t cache_inuse[MI_CACHE_FIELDS]; // zero bit = free + + +mi_decl_noinline void* _mi_segment_cache_pop(size_t size, mi_commit_mask_t* commit_mask, mi_commit_mask_t* decommit_mask, bool* large, bool* is_pinned, bool* is_zero, size_t* memid, mi_os_tld_t* tld) +{ +#ifdef MI_CACHE_DISABLE + return NULL; +#else + + // only segment blocks + if (size != MI_SEGMENT_SIZE) return NULL; + + // numa node determines start field + const int numa_node = _mi_os_numa_node(tld); + size_t start_field = 0; + if (numa_node > 0) { + start_field = (MI_CACHE_FIELDS / _mi_os_numa_node_count())*numa_node; + if (start_field >= MI_CACHE_FIELDS) start_field = 0; + } + + // find an available slot + mi_bitmap_index_t bitidx = 0; + bool claimed = false; + if (*large) { // large allowed? + claimed = _mi_bitmap_try_find_from_claim(cache_available_large, MI_CACHE_FIELDS, start_field, 1, &bitidx); + if (claimed) *large = true; + } + if (!claimed) { + claimed = _mi_bitmap_try_find_from_claim(cache_available, MI_CACHE_FIELDS, start_field, 1, &bitidx); + if (claimed) *large = false; + } + + if (!claimed) return NULL; + + // found a slot + mi_cache_slot_t* slot = &cache[mi_bitmap_index_bit(bitidx)]; + void* p = slot->p; + *memid = slot->memid; + *is_pinned = slot->is_pinned; + *is_zero = false; + *commit_mask = slot->commit_mask; + *decommit_mask = slot->decommit_mask; + slot->p = NULL; + mi_atomic_storei64_release(&slot->expire,(mi_msecs_t)0); + + // mark the slot as free again + mi_assert_internal(_mi_bitmap_is_claimed(cache_inuse, MI_CACHE_FIELDS, 1, bitidx)); + _mi_bitmap_unclaim(cache_inuse, MI_CACHE_FIELDS, 1, bitidx); + return p; +#endif +} + +static mi_decl_noinline void mi_commit_mask_decommit(mi_commit_mask_t* cmask, void* p, size_t total, mi_stats_t* stats) +{ + if (mi_commit_mask_is_empty(cmask)) { + // nothing + } + else if (mi_commit_mask_is_full(cmask)) { + _mi_os_decommit(p, total, stats); + } + else { + // todo: one call to decommit the whole at once? + mi_assert_internal((total%MI_COMMIT_MASK_BITS)==0); + size_t part = total/MI_COMMIT_MASK_BITS; + size_t idx; + size_t count; + mi_commit_mask_foreach(cmask, idx, count) { + void* start = (uint8_t*)p + (idx*part); + size_t size = count*part; + _mi_os_decommit(start, size, stats); + } + mi_commit_mask_foreach_end() + } + mi_commit_mask_create_empty(cmask); +} + +#define MI_MAX_PURGE_PER_PUSH (4) + +static mi_decl_noinline void mi_segment_cache_purge(bool force, mi_os_tld_t* tld) +{ + MI_UNUSED(tld); + if (!mi_option_is_enabled(mi_option_allow_decommit)) return; + mi_msecs_t now = _mi_clock_now(); + size_t purged = 0; + const size_t max_visits = (force ? MI_CACHE_MAX /* visit all */ : MI_CACHE_FIELDS /* probe at most N (=16) slots */); + size_t idx = (force ? 0 : _mi_random_shuffle((uintptr_t)now) % MI_CACHE_MAX /* random start */ ); + for (size_t visited = 0; visited < max_visits; visited++,idx++) { // visit N slots + if (idx >= MI_CACHE_MAX) idx = 0; // wrap + mi_cache_slot_t* slot = &cache[idx]; + mi_msecs_t expire = mi_atomic_loadi64_relaxed(&slot->expire); + if (expire != 0 && (force || now >= expire)) { // racy read + // seems expired, first claim it from available + purged++; + mi_bitmap_index_t bitidx = mi_bitmap_index_create_from_bit(idx); + if (_mi_bitmap_claim(cache_available, MI_CACHE_FIELDS, 1, bitidx, NULL)) { + // was available, we claimed it + expire = mi_atomic_loadi64_acquire(&slot->expire); + if (expire != 0 && (force || now >= expire)) { // safe read + // still expired, decommit it + mi_atomic_storei64_relaxed(&slot->expire,(mi_msecs_t)0); + mi_assert_internal(!mi_commit_mask_is_empty(&slot->commit_mask) && _mi_bitmap_is_claimed(cache_available_large, MI_CACHE_FIELDS, 1, bitidx)); + _mi_abandoned_await_readers(); // wait until safe to decommit + // decommit committed parts + // TODO: instead of decommit, we could also free to the OS? + mi_commit_mask_decommit(&slot->commit_mask, slot->p, MI_SEGMENT_SIZE, tld->stats); + mi_commit_mask_create_empty(&slot->decommit_mask); + } + _mi_bitmap_unclaim(cache_available, MI_CACHE_FIELDS, 1, bitidx); // make it available again for a pop + } + if (!force && purged > MI_MAX_PURGE_PER_PUSH) break; // bound to no more than N purge tries per push + } + } +} + +void _mi_segment_cache_collect(bool force, mi_os_tld_t* tld) { + mi_segment_cache_purge(force, tld ); +} + +mi_decl_noinline bool _mi_segment_cache_push(void* start, size_t size, size_t memid, const mi_commit_mask_t* commit_mask, const mi_commit_mask_t* decommit_mask, bool is_large, bool is_pinned, mi_os_tld_t* tld) +{ +#ifdef MI_CACHE_DISABLE + return false; +#else + + // only for normal segment blocks + if (size != MI_SEGMENT_SIZE || ((uintptr_t)start % MI_SEGMENT_ALIGN) != 0) return false; + + // numa node determines start field + int numa_node = _mi_os_numa_node(NULL); + size_t start_field = 0; + if (numa_node > 0) { + start_field = (MI_CACHE_FIELDS / _mi_os_numa_node_count())*numa_node; + if (start_field >= MI_CACHE_FIELDS) start_field = 0; + } + + // purge expired entries + mi_segment_cache_purge(false /* force? */, tld); + + // find an available slot + mi_bitmap_index_t bitidx; + bool claimed = _mi_bitmap_try_find_from_claim(cache_inuse, MI_CACHE_FIELDS, start_field, 1, &bitidx); + if (!claimed) return false; + + mi_assert_internal(_mi_bitmap_is_claimed(cache_available, MI_CACHE_FIELDS, 1, bitidx)); + mi_assert_internal(_mi_bitmap_is_claimed(cache_available_large, MI_CACHE_FIELDS, 1, bitidx)); +#if MI_DEBUG>1 + if (is_pinned || is_large) { + mi_assert_internal(mi_commit_mask_is_full(commit_mask)); + } +#endif + + // set the slot + mi_cache_slot_t* slot = &cache[mi_bitmap_index_bit(bitidx)]; + slot->p = start; + slot->memid = memid; + slot->is_pinned = is_pinned; + mi_atomic_storei64_relaxed(&slot->expire,(mi_msecs_t)0); + slot->commit_mask = *commit_mask; + slot->decommit_mask = *decommit_mask; + if (!mi_commit_mask_is_empty(commit_mask) && !is_large && !is_pinned && mi_option_is_enabled(mi_option_allow_decommit)) { + long delay = mi_option_get(mi_option_segment_decommit_delay); + if (delay == 0) { + _mi_abandoned_await_readers(); // wait until safe to decommit + mi_commit_mask_decommit(&slot->commit_mask, start, MI_SEGMENT_SIZE, tld->stats); + mi_commit_mask_create_empty(&slot->decommit_mask); + } + else { + mi_atomic_storei64_release(&slot->expire, _mi_clock_now() + delay); + } + } + + // make it available + _mi_bitmap_unclaim((is_large ? cache_available_large : cache_available), MI_CACHE_FIELDS, 1, bitidx); + return true; +#endif +} + + +/* ----------------------------------------------------------- + The following functions are to reliably find the segment or + block that encompasses any pointer p (or NULL if it is not + in any of our segments). + We maintain a bitmap of all memory with 1 bit per MI_SEGMENT_SIZE (64MiB) + set to 1 if it contains the segment meta data. +----------------------------------------------------------- */ + + +#if (MI_INTPTR_SIZE==8) +#define MI_MAX_ADDRESS ((size_t)20 << 40) // 20TB +#else +#define MI_MAX_ADDRESS ((size_t)2 << 30) // 2Gb +#endif + +#define MI_SEGMENT_MAP_BITS (MI_MAX_ADDRESS / MI_SEGMENT_SIZE) +#define MI_SEGMENT_MAP_SIZE (MI_SEGMENT_MAP_BITS / 8) +#define MI_SEGMENT_MAP_WSIZE (MI_SEGMENT_MAP_SIZE / MI_INTPTR_SIZE) + +static _Atomic(uintptr_t) mi_segment_map[MI_SEGMENT_MAP_WSIZE + 1]; // 2KiB per TB with 64MiB segments + +static size_t mi_segment_map_index_of(const mi_segment_t* segment, size_t* bitidx) { + mi_assert_internal(_mi_ptr_segment(segment) == segment); // is it aligned on MI_SEGMENT_SIZE? + if ((uintptr_t)segment >= MI_MAX_ADDRESS) { + *bitidx = 0; + return MI_SEGMENT_MAP_WSIZE; + } + else { + const uintptr_t segindex = ((uintptr_t)segment) / MI_SEGMENT_SIZE; + *bitidx = segindex % MI_INTPTR_BITS; + const size_t mapindex = segindex / MI_INTPTR_BITS; + mi_assert_internal(mapindex < MI_SEGMENT_MAP_WSIZE); + return mapindex; + } +} + +void _mi_segment_map_allocated_at(const mi_segment_t* segment) { + size_t bitidx; + size_t index = mi_segment_map_index_of(segment, &bitidx); + mi_assert_internal(index <= MI_SEGMENT_MAP_WSIZE); + if (index==MI_SEGMENT_MAP_WSIZE) return; + uintptr_t mask = mi_atomic_load_relaxed(&mi_segment_map[index]); + uintptr_t newmask; + do { + newmask = (mask | ((uintptr_t)1 << bitidx)); + } while (!mi_atomic_cas_weak_release(&mi_segment_map[index], &mask, newmask)); +} + +void _mi_segment_map_freed_at(const mi_segment_t* segment) { + size_t bitidx; + size_t index = mi_segment_map_index_of(segment, &bitidx); + mi_assert_internal(index <= MI_SEGMENT_MAP_WSIZE); + if (index == MI_SEGMENT_MAP_WSIZE) return; + uintptr_t mask = mi_atomic_load_relaxed(&mi_segment_map[index]); + uintptr_t newmask; + do { + newmask = (mask & ~((uintptr_t)1 << bitidx)); + } while (!mi_atomic_cas_weak_release(&mi_segment_map[index], &mask, newmask)); +} + +// Determine the segment belonging to a pointer or NULL if it is not in a valid segment. +static mi_segment_t* _mi_segment_of(const void* p) { + mi_segment_t* segment = _mi_ptr_segment(p); + if (segment == NULL) return NULL; + size_t bitidx; + size_t index = mi_segment_map_index_of(segment, &bitidx); + // fast path: for any pointer to valid small/medium/large object or first MI_SEGMENT_SIZE in huge + const uintptr_t mask = mi_atomic_load_relaxed(&mi_segment_map[index]); + if (mi_likely((mask & ((uintptr_t)1 << bitidx)) != 0)) { + return segment; // yes, allocated by us + } + if (index==MI_SEGMENT_MAP_WSIZE) return NULL; + + // TODO: maintain max/min allocated range for efficiency for more efficient rejection of invalid pointers? + + // search downwards for the first segment in case it is an interior pointer + // could be slow but searches in MI_INTPTR_SIZE * MI_SEGMENT_SIZE (512MiB) steps trough + // valid huge objects + // note: we could maintain a lowest index to speed up the path for invalid pointers? + size_t lobitidx; + size_t loindex; + uintptr_t lobits = mask & (((uintptr_t)1 << bitidx) - 1); + if (lobits != 0) { + loindex = index; + lobitidx = mi_bsr(lobits); // lobits != 0 + } + else if (index == 0) { + return NULL; + } + else { + mi_assert_internal(index > 0); + uintptr_t lomask = mask; + loindex = index; + do { + loindex--; + lomask = mi_atomic_load_relaxed(&mi_segment_map[loindex]); + } while (lomask != 0 && loindex > 0); + if (lomask == 0) return NULL; + lobitidx = mi_bsr(lomask); // lomask != 0 + } + mi_assert_internal(loindex < MI_SEGMENT_MAP_WSIZE); + // take difference as the addresses could be larger than the MAX_ADDRESS space. + size_t diff = (((index - loindex) * (8*MI_INTPTR_SIZE)) + bitidx - lobitidx) * MI_SEGMENT_SIZE; + segment = (mi_segment_t*)((uint8_t*)segment - diff); + + if (segment == NULL) return NULL; + mi_assert_internal((void*)segment < p); + bool cookie_ok = (_mi_ptr_cookie(segment) == segment->cookie); + mi_assert_internal(cookie_ok); + if (mi_unlikely(!cookie_ok)) return NULL; + if (((uint8_t*)segment + mi_segment_size(segment)) <= (uint8_t*)p) return NULL; // outside the range + mi_assert_internal(p >= (void*)segment && (uint8_t*)p < (uint8_t*)segment + mi_segment_size(segment)); + return segment; +} + +// Is this a valid pointer in our heap? +static bool mi_is_valid_pointer(const void* p) { + return (_mi_segment_of(p) != NULL); +} + +mi_decl_nodiscard mi_decl_export bool mi_is_in_heap_region(const void* p) mi_attr_noexcept { + return mi_is_valid_pointer(p); +} + +/* +// Return the full segment range belonging to a pointer +static void* mi_segment_range_of(const void* p, size_t* size) { + mi_segment_t* segment = _mi_segment_of(p); + if (segment == NULL) { + if (size != NULL) *size = 0; + return NULL; + } + else { + if (size != NULL) *size = segment->segment_size; + return segment; + } + mi_assert_expensive(page == NULL || mi_segment_is_valid(_mi_page_segment(page),tld)); + mi_assert_internal(page == NULL || (mi_segment_page_size(_mi_page_segment(page)) - (MI_SECURE == 0 ? 0 : _mi_os_page_size())) >= block_size); + mi_reset_delayed(tld); + mi_assert_internal(page == NULL || mi_page_not_in_queue(page, tld)); + return page; +} +*/ diff --git a/compat/mimalloc/segment.c b/compat/mimalloc/segment.c new file mode 100644 index 00000000000000..d772440d69f032 --- /dev/null +++ b/compat/mimalloc/segment.c @@ -0,0 +1,1542 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2020, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include // memset +#include + +#define MI_PAGE_HUGE_ALIGN (256*1024) + +static void mi_segment_delayed_decommit(mi_segment_t* segment, bool force, mi_stats_t* stats); + + +// ------------------------------------------------------------------- +// commit mask +// ------------------------------------------------------------------- + +static bool mi_commit_mask_all_set(const mi_commit_mask_t* commit, const mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + if ((commit->mask[i] & cm->mask[i]) != cm->mask[i]) return false; + } + return true; +} + +static bool mi_commit_mask_any_set(const mi_commit_mask_t* commit, const mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + if ((commit->mask[i] & cm->mask[i]) != 0) return true; + } + return false; +} + +static void mi_commit_mask_create_intersect(const mi_commit_mask_t* commit, const mi_commit_mask_t* cm, mi_commit_mask_t* res) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + res->mask[i] = (commit->mask[i] & cm->mask[i]); + } +} + +static void mi_commit_mask_clear(mi_commit_mask_t* res, const mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + res->mask[i] &= ~(cm->mask[i]); + } +} + +static void mi_commit_mask_set(mi_commit_mask_t* res, const mi_commit_mask_t* cm) { + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + res->mask[i] |= cm->mask[i]; + } +} + +static void mi_commit_mask_create(size_t bitidx, size_t bitcount, mi_commit_mask_t* cm) { + mi_assert_internal(bitidx < MI_COMMIT_MASK_BITS); + mi_assert_internal((bitidx + bitcount) <= MI_COMMIT_MASK_BITS); + if (bitcount == MI_COMMIT_MASK_BITS) { + mi_assert_internal(bitidx==0); + mi_commit_mask_create_full(cm); + } + else if (bitcount == 0) { + mi_commit_mask_create_empty(cm); + } + else { + mi_commit_mask_create_empty(cm); + size_t i = bitidx / MI_COMMIT_MASK_FIELD_BITS; + size_t ofs = bitidx % MI_COMMIT_MASK_FIELD_BITS; + while (bitcount > 0) { + mi_assert_internal(i < MI_COMMIT_MASK_FIELD_COUNT); + size_t avail = MI_COMMIT_MASK_FIELD_BITS - ofs; + size_t count = (bitcount > avail ? avail : bitcount); + size_t mask = (count >= MI_COMMIT_MASK_FIELD_BITS ? ~((size_t)0) : (((size_t)1 << count) - 1) << ofs); + cm->mask[i] = mask; + bitcount -= count; + ofs = 0; + i++; + } + } +} + +size_t _mi_commit_mask_committed_size(const mi_commit_mask_t* cm, size_t total) { + mi_assert_internal((total%MI_COMMIT_MASK_BITS)==0); + size_t count = 0; + for (size_t i = 0; i < MI_COMMIT_MASK_FIELD_COUNT; i++) { + size_t mask = cm->mask[i]; + if (~mask == 0) { + count += MI_COMMIT_MASK_FIELD_BITS; + } + else { + for (; mask != 0; mask >>= 1) { // todo: use popcount + if ((mask&1)!=0) count++; + } + } + } + // we use total since for huge segments each commit bit may represent a larger size + return ((total / MI_COMMIT_MASK_BITS) * count); +} + + +size_t _mi_commit_mask_next_run(const mi_commit_mask_t* cm, size_t* idx) { + size_t i = (*idx) / MI_COMMIT_MASK_FIELD_BITS; + size_t ofs = (*idx) % MI_COMMIT_MASK_FIELD_BITS; + size_t mask = 0; + // find first ones + while (i < MI_COMMIT_MASK_FIELD_COUNT) { + mask = cm->mask[i]; + mask >>= ofs; + if (mask != 0) { + while ((mask&1) == 0) { + mask >>= 1; + ofs++; + } + break; + } + i++; + ofs = 0; + } + if (i >= MI_COMMIT_MASK_FIELD_COUNT) { + // not found + *idx = MI_COMMIT_MASK_BITS; + return 0; + } + else { + // found, count ones + size_t count = 0; + *idx = (i*MI_COMMIT_MASK_FIELD_BITS) + ofs; + do { + mi_assert_internal(ofs < MI_COMMIT_MASK_FIELD_BITS && (mask&1) == 1); + do { + count++; + mask >>= 1; + } while ((mask&1) == 1); + if ((((*idx + count) % MI_COMMIT_MASK_FIELD_BITS) == 0)) { + i++; + if (i >= MI_COMMIT_MASK_FIELD_COUNT) break; + mask = cm->mask[i]; + ofs = 0; + } + } while ((mask&1) == 1); + mi_assert_internal(count > 0); + return count; + } +} + + +/* -------------------------------------------------------------------------------- + Segment allocation + + If a thread ends, it "abandons" pages with used blocks + and there is an abandoned segment list whose segments can + be reclaimed by still running threads, much like work-stealing. +-------------------------------------------------------------------------------- */ + + +/* ----------------------------------------------------------- + Slices +----------------------------------------------------------- */ + + +static const mi_slice_t* mi_segment_slices_end(const mi_segment_t* segment) { + return &segment->slices[segment->slice_entries]; +} + +static uint8_t* mi_slice_start(const mi_slice_t* slice) { + mi_segment_t* segment = _mi_ptr_segment(slice); + mi_assert_internal(slice >= segment->slices && slice < mi_segment_slices_end(segment)); + return ((uint8_t*)segment + ((slice - segment->slices)*MI_SEGMENT_SLICE_SIZE)); +} + + +/* ----------------------------------------------------------- + Bins +----------------------------------------------------------- */ +// Use bit scan forward to quickly find the first zero bit if it is available + +static inline size_t mi_slice_bin8(size_t slice_count) { + if (slice_count<=1) return slice_count; + mi_assert_internal(slice_count <= MI_SLICES_PER_SEGMENT); + slice_count--; + size_t s = mi_bsr(slice_count); // slice_count > 1 + if (s <= 2) return slice_count + 1; + size_t bin = ((s << 2) | ((slice_count >> (s - 2))&0x03)) - 4; + return bin; +} + +static inline size_t mi_slice_bin(size_t slice_count) { + mi_assert_internal(slice_count*MI_SEGMENT_SLICE_SIZE <= MI_SEGMENT_SIZE); + mi_assert_internal(mi_slice_bin8(MI_SLICES_PER_SEGMENT) <= MI_SEGMENT_BIN_MAX); + size_t bin = mi_slice_bin8(slice_count); + mi_assert_internal(bin <= MI_SEGMENT_BIN_MAX); + return bin; +} + +static inline size_t mi_slice_index(const mi_slice_t* slice) { + mi_segment_t* segment = _mi_ptr_segment(slice); + ptrdiff_t index = slice - segment->slices; + mi_assert_internal(index >= 0 && index < (ptrdiff_t)segment->slice_entries); + return index; +} + + +/* ----------------------------------------------------------- + Slice span queues +----------------------------------------------------------- */ + +static void mi_span_queue_push(mi_span_queue_t* sq, mi_slice_t* slice) { + // todo: or push to the end? + mi_assert_internal(slice->prev == NULL && slice->next==NULL); + slice->prev = NULL; // paranoia + slice->next = sq->first; + sq->first = slice; + if (slice->next != NULL) slice->next->prev = slice; + else sq->last = slice; + slice->xblock_size = 0; // free +} + +static mi_span_queue_t* mi_span_queue_for(size_t slice_count, mi_segments_tld_t* tld) { + size_t bin = mi_slice_bin(slice_count); + mi_span_queue_t* sq = &tld->spans[bin]; + mi_assert_internal(sq->slice_count >= slice_count); + return sq; +} + +static void mi_span_queue_delete(mi_span_queue_t* sq, mi_slice_t* slice) { + mi_assert_internal(slice->xblock_size==0 && slice->slice_count>0 && slice->slice_offset==0); + // should work too if the queue does not contain slice (which can happen during reclaim) + if (slice->prev != NULL) slice->prev->next = slice->next; + if (slice == sq->first) sq->first = slice->next; + if (slice->next != NULL) slice->next->prev = slice->prev; + if (slice == sq->last) sq->last = slice->prev; + slice->prev = NULL; + slice->next = NULL; + slice->xblock_size = 1; // no more free +} + + +/* ----------------------------------------------------------- + Invariant checking +----------------------------------------------------------- */ + +static bool mi_slice_is_used(const mi_slice_t* slice) { + return (slice->xblock_size > 0); +} + + +#if (MI_DEBUG>=3) +static bool mi_span_queue_contains(mi_span_queue_t* sq, mi_slice_t* slice) { + for (mi_slice_t* s = sq->first; s != NULL; s = s->next) { + if (s==slice) return true; + } + return false; +} + +static bool mi_segment_is_valid(mi_segment_t* segment, mi_segments_tld_t* tld) { + mi_assert_internal(segment != NULL); + mi_assert_internal(_mi_ptr_cookie(segment) == segment->cookie); + mi_assert_internal(segment->abandoned <= segment->used); + mi_assert_internal(segment->thread_id == 0 || segment->thread_id == _mi_thread_id()); + mi_assert_internal(mi_commit_mask_all_set(&segment->commit_mask, &segment->decommit_mask)); // can only decommit committed blocks + //mi_assert_internal(segment->segment_info_size % MI_SEGMENT_SLICE_SIZE == 0); + mi_slice_t* slice = &segment->slices[0]; + const mi_slice_t* end = mi_segment_slices_end(segment); + size_t used_count = 0; + mi_span_queue_t* sq; + while(slice < end) { + mi_assert_internal(slice->slice_count > 0); + mi_assert_internal(slice->slice_offset == 0); + size_t index = mi_slice_index(slice); + size_t maxindex = (index + slice->slice_count >= segment->slice_entries ? segment->slice_entries : index + slice->slice_count) - 1; + if (mi_slice_is_used(slice)) { // a page in use, we need at least MAX_SLICE_OFFSET valid back offsets + used_count++; + for (size_t i = 0; i <= MI_MAX_SLICE_OFFSET && index + i <= maxindex; i++) { + mi_assert_internal(segment->slices[index + i].slice_offset == i*sizeof(mi_slice_t)); + mi_assert_internal(i==0 || segment->slices[index + i].slice_count == 0); + mi_assert_internal(i==0 || segment->slices[index + i].xblock_size == 1); + } + // and the last entry as well (for coalescing) + const mi_slice_t* last = slice + slice->slice_count - 1; + if (last > slice && last < mi_segment_slices_end(segment)) { + mi_assert_internal(last->slice_offset == (slice->slice_count-1)*sizeof(mi_slice_t)); + mi_assert_internal(last->slice_count == 0); + mi_assert_internal(last->xblock_size == 1); + } + } + else { // free range of slices; only last slice needs a valid back offset + mi_slice_t* last = &segment->slices[maxindex]; + if (segment->kind != MI_SEGMENT_HUGE || slice->slice_count <= (segment->slice_entries - segment->segment_info_slices)) { + mi_assert_internal((uint8_t*)slice == (uint8_t*)last - last->slice_offset); + } + mi_assert_internal(slice == last || last->slice_count == 0 ); + mi_assert_internal(last->xblock_size == 0 || (segment->kind==MI_SEGMENT_HUGE && last->xblock_size==1)); + if (segment->kind != MI_SEGMENT_HUGE && segment->thread_id != 0) { // segment is not huge or abandoned + sq = mi_span_queue_for(slice->slice_count,tld); + mi_assert_internal(mi_span_queue_contains(sq,slice)); + } + } + slice = &segment->slices[maxindex+1]; + } + mi_assert_internal(slice == end); + mi_assert_internal(used_count == segment->used + 1); + return true; +} +#endif + +/* ----------------------------------------------------------- + Segment size calculations +----------------------------------------------------------- */ + +static size_t mi_segment_info_size(mi_segment_t* segment) { + return segment->segment_info_slices * MI_SEGMENT_SLICE_SIZE; +} + +static uint8_t* _mi_segment_page_start_from_slice(const mi_segment_t* segment, const mi_slice_t* slice, size_t xblock_size, size_t* page_size) +{ + ptrdiff_t idx = slice - segment->slices; + size_t psize = (size_t)slice->slice_count * MI_SEGMENT_SLICE_SIZE; + // make the start not OS page aligned for smaller blocks to avoid page/cache effects + size_t start_offset = (xblock_size >= MI_INTPTR_SIZE && xblock_size <= 1024 ? MI_MAX_ALIGN_GUARANTEE : 0); + if (page_size != NULL) { *page_size = psize - start_offset; } + return (uint8_t*)segment + ((idx*MI_SEGMENT_SLICE_SIZE) + start_offset); +} + +// Start of the page available memory; can be used on uninitialized pages +uint8_t* _mi_segment_page_start(const mi_segment_t* segment, const mi_page_t* page, size_t* page_size) +{ + const mi_slice_t* slice = mi_page_to_slice((mi_page_t*)page); + uint8_t* p = _mi_segment_page_start_from_slice(segment, slice, page->xblock_size, page_size); + mi_assert_internal(page->xblock_size > 0 || _mi_ptr_page(p) == page); + mi_assert_internal(_mi_ptr_segment(p) == segment); + return p; +} + + +static size_t mi_segment_calculate_slices(size_t required, size_t* pre_size, size_t* info_slices) { + size_t page_size = _mi_os_page_size(); + size_t isize = _mi_align_up(sizeof(mi_segment_t), page_size); + size_t guardsize = 0; + + if (MI_SECURE>0) { + // in secure mode, we set up a protected page in between the segment info + // and the page data (and one at the end of the segment) + guardsize = page_size; + required = _mi_align_up(required, page_size); + } + + if (pre_size != NULL) *pre_size = isize; + isize = _mi_align_up(isize + guardsize, MI_SEGMENT_SLICE_SIZE); + if (info_slices != NULL) *info_slices = isize / MI_SEGMENT_SLICE_SIZE; + size_t segment_size = (required==0 ? MI_SEGMENT_SIZE : _mi_align_up( required + isize + guardsize, MI_SEGMENT_SLICE_SIZE) ); + mi_assert_internal(segment_size % MI_SEGMENT_SLICE_SIZE == 0); + return (segment_size / MI_SEGMENT_SLICE_SIZE); +} + + +/* ---------------------------------------------------------------------------- +Segment caches +We keep a small segment cache per thread to increase local +reuse and avoid setting/clearing guard pages in secure mode. +------------------------------------------------------------------------------- */ + +static void mi_segments_track_size(long segment_size, mi_segments_tld_t* tld) { + if (segment_size>=0) _mi_stat_increase(&tld->stats->segments,1); + else _mi_stat_decrease(&tld->stats->segments,1); + tld->count += (segment_size >= 0 ? 1 : -1); + if (tld->count > tld->peak_count) tld->peak_count = tld->count; + tld->current_size += segment_size; + if (tld->current_size > tld->peak_size) tld->peak_size = tld->current_size; +} + +static void mi_segment_os_free(mi_segment_t* segment, mi_segments_tld_t* tld) { + segment->thread_id = 0; + _mi_segment_map_freed_at(segment); + mi_segments_track_size(-((long)mi_segment_size(segment)),tld); + if (MI_SECURE>0) { + // _mi_os_unprotect(segment, mi_segment_size(segment)); // ensure no more guard pages are set + // unprotect the guard pages; we cannot just unprotect the whole segment size as part may be decommitted + size_t os_pagesize = _mi_os_page_size(); + _mi_os_unprotect((uint8_t*)segment + mi_segment_info_size(segment) - os_pagesize, os_pagesize); + uint8_t* end = (uint8_t*)segment + mi_segment_size(segment) - os_pagesize; + _mi_os_unprotect(end, os_pagesize); + } + + // purge delayed decommits now? (no, leave it to the cache) + // mi_segment_delayed_decommit(segment,true,tld->stats); + + // _mi_os_free(segment, mi_segment_size(segment), /*segment->memid,*/ tld->stats); + const size_t size = mi_segment_size(segment); + if (size != MI_SEGMENT_SIZE || !_mi_segment_cache_push(segment, size, segment->memid, &segment->commit_mask, &segment->decommit_mask, segment->mem_is_large, segment->mem_is_pinned, tld->os)) { + const size_t csize = _mi_commit_mask_committed_size(&segment->commit_mask, size); + if (csize > 0 && !segment->mem_is_pinned) _mi_stat_decrease(&_mi_stats_main.committed, csize); + _mi_abandoned_await_readers(); // wait until safe to free + _mi_arena_free(segment, mi_segment_size(segment), segment->memid, segment->mem_is_pinned /* pretend not committed to not double count decommits */, tld->os); + } +} + +// called by threads that are terminating +void _mi_segment_thread_collect(mi_segments_tld_t* tld) { + MI_UNUSED(tld); + // nothing to do +} + + +/* ----------------------------------------------------------- + Span management +----------------------------------------------------------- */ + +static void mi_segment_commit_mask(mi_segment_t* segment, bool conservative, uint8_t* p, size_t size, uint8_t** start_p, size_t* full_size, mi_commit_mask_t* cm) { + mi_assert_internal(_mi_ptr_segment(p) == segment); + mi_assert_internal(segment->kind != MI_SEGMENT_HUGE); + mi_commit_mask_create_empty(cm); + if (size == 0 || size > MI_SEGMENT_SIZE || segment->kind == MI_SEGMENT_HUGE) return; + const size_t segstart = mi_segment_info_size(segment); + const size_t segsize = mi_segment_size(segment); + if (p >= (uint8_t*)segment + segsize) return; + + size_t pstart = (p - (uint8_t*)segment); + mi_assert_internal(pstart + size <= segsize); + + size_t start; + size_t end; + if (conservative) { + // decommit conservative + start = _mi_align_up(pstart, MI_COMMIT_SIZE); + end = _mi_align_down(pstart + size, MI_COMMIT_SIZE); + mi_assert_internal(start >= segstart); + mi_assert_internal(end <= segsize); + } + else { + // commit liberal + start = _mi_align_down(pstart, MI_MINIMAL_COMMIT_SIZE); + end = _mi_align_up(pstart + size, MI_MINIMAL_COMMIT_SIZE); + } + if (pstart >= segstart && start < segstart) { // note: the mask is also calculated for an initial commit of the info area + start = segstart; + } + if (end > segsize) { + end = segsize; + } + + mi_assert_internal(start <= pstart && (pstart + size) <= end); + mi_assert_internal(start % MI_COMMIT_SIZE==0 && end % MI_COMMIT_SIZE == 0); + *start_p = (uint8_t*)segment + start; + *full_size = (end > start ? end - start : 0); + if (*full_size == 0) return; + + size_t bitidx = start / MI_COMMIT_SIZE; + mi_assert_internal(bitidx < MI_COMMIT_MASK_BITS); + + size_t bitcount = *full_size / MI_COMMIT_SIZE; // can be 0 + if (bitidx + bitcount > MI_COMMIT_MASK_BITS) { + _mi_warning_message("commit mask overflow: idx=%zu count=%zu start=%zx end=%zx p=0x%p size=%zu fullsize=%zu\n", bitidx, bitcount, start, end, p, size, *full_size); + } + mi_assert_internal((bitidx + bitcount) <= MI_COMMIT_MASK_BITS); + mi_commit_mask_create(bitidx, bitcount, cm); +} + + +static bool mi_segment_commitx(mi_segment_t* segment, bool commit, uint8_t* p, size_t size, mi_stats_t* stats) { + mi_assert_internal(mi_commit_mask_all_set(&segment->commit_mask, &segment->decommit_mask)); + + // try to commit in at least MI_MINIMAL_COMMIT_SIZE sizes. + /* + if (commit && size > 0) { + const size_t csize = _mi_align_up(size, MI_MINIMAL_COMMIT_SIZE); + if (p + csize <= mi_segment_end(segment)) { + size = csize; + } + } + */ + // commit liberal, but decommit conservative + uint8_t* start = NULL; + size_t full_size = 0; + mi_commit_mask_t mask; + mi_segment_commit_mask(segment, !commit/*conservative*/, p, size, &start, &full_size, &mask); + if (mi_commit_mask_is_empty(&mask) || full_size==0) return true; + + if (commit && !mi_commit_mask_all_set(&segment->commit_mask, &mask)) { + bool is_zero = false; + mi_commit_mask_t cmask; + mi_commit_mask_create_intersect(&segment->commit_mask, &mask, &cmask); + _mi_stat_decrease(&_mi_stats_main.committed, _mi_commit_mask_committed_size(&cmask, MI_SEGMENT_SIZE)); // adjust for overlap + if (!_mi_os_commit(start,full_size,&is_zero,stats)) return false; + mi_commit_mask_set(&segment->commit_mask, &mask); + } + else if (!commit && mi_commit_mask_any_set(&segment->commit_mask, &mask)) { + mi_assert_internal((void*)start != (void*)segment); + //mi_assert_internal(mi_commit_mask_all_set(&segment->commit_mask, &mask)); + + mi_commit_mask_t cmask; + mi_commit_mask_create_intersect(&segment->commit_mask, &mask, &cmask); + _mi_stat_increase(&_mi_stats_main.committed, full_size - _mi_commit_mask_committed_size(&cmask, MI_SEGMENT_SIZE)); // adjust for overlap + if (segment->allow_decommit) { + _mi_os_decommit(start, full_size, stats); // ok if this fails + } + mi_commit_mask_clear(&segment->commit_mask, &mask); + } + // increase expiration of reusing part of the delayed decommit + if (commit && mi_commit_mask_any_set(&segment->decommit_mask, &mask)) { + segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_decommit_delay); + } + // always undo delayed decommits + mi_commit_mask_clear(&segment->decommit_mask, &mask); + return true; +} + +static bool mi_segment_ensure_committed(mi_segment_t* segment, uint8_t* p, size_t size, mi_stats_t* stats) { + mi_assert_internal(mi_commit_mask_all_set(&segment->commit_mask, &segment->decommit_mask)); + // note: assumes commit_mask is always full for huge segments as otherwise the commit mask bits can overflow + if (mi_commit_mask_is_full(&segment->commit_mask) && mi_commit_mask_is_empty(&segment->decommit_mask)) return true; // fully committed + return mi_segment_commitx(segment,true,p,size,stats); +} + +static void mi_segment_perhaps_decommit(mi_segment_t* segment, uint8_t* p, size_t size, mi_stats_t* stats) { + if (!segment->allow_decommit) return; + if (mi_option_get(mi_option_decommit_delay) == 0) { + mi_segment_commitx(segment, false, p, size, stats); + } + else { + // register for future decommit in the decommit mask + uint8_t* start = NULL; + size_t full_size = 0; + mi_commit_mask_t mask; + mi_segment_commit_mask(segment, true /*conservative*/, p, size, &start, &full_size, &mask); + if (mi_commit_mask_is_empty(&mask) || full_size==0) return; + + // update delayed commit + mi_assert_internal(segment->decommit_expire > 0 || mi_commit_mask_is_empty(&segment->decommit_mask)); + mi_commit_mask_t cmask; + mi_commit_mask_create_intersect(&segment->commit_mask, &mask, &cmask); // only decommit what is committed; span_free may try to decommit more + mi_commit_mask_set(&segment->decommit_mask, &cmask); + mi_msecs_t now = _mi_clock_now(); + if (segment->decommit_expire == 0) { + // no previous decommits, initialize now + segment->decommit_expire = now + mi_option_get(mi_option_decommit_delay); + } + else if (segment->decommit_expire <= now) { + // previous decommit mask already expired + // mi_segment_delayed_decommit(segment, true, stats); + segment->decommit_expire = now + mi_option_get(mi_option_decommit_extend_delay); // (mi_option_get(mi_option_decommit_delay) / 8); // wait a tiny bit longer in case there is a series of free's + } + else { + // previous decommit mask is not yet expired, increase the expiration by a bit. + segment->decommit_expire += mi_option_get(mi_option_decommit_extend_delay); + } + } +} + +static void mi_segment_delayed_decommit(mi_segment_t* segment, bool force, mi_stats_t* stats) { + if (!segment->allow_decommit || mi_commit_mask_is_empty(&segment->decommit_mask)) return; + mi_msecs_t now = _mi_clock_now(); + if (!force && now < segment->decommit_expire) return; + + mi_commit_mask_t mask = segment->decommit_mask; + segment->decommit_expire = 0; + mi_commit_mask_create_empty(&segment->decommit_mask); + + size_t idx; + size_t count; + mi_commit_mask_foreach(&mask, idx, count) { + // if found, decommit that sequence + if (count > 0) { + uint8_t* p = (uint8_t*)segment + (idx*MI_COMMIT_SIZE); + size_t size = count * MI_COMMIT_SIZE; + mi_segment_commitx(segment, false, p, size, stats); + } + } + mi_commit_mask_foreach_end() + mi_assert_internal(mi_commit_mask_is_empty(&segment->decommit_mask)); +} + + +static bool mi_segment_is_abandoned(mi_segment_t* segment) { + return (segment->thread_id == 0); +} + +// note: can be called on abandoned segments +static void mi_segment_span_free(mi_segment_t* segment, size_t slice_index, size_t slice_count, mi_segments_tld_t* tld) { + mi_assert_internal(slice_index < segment->slice_entries); + mi_span_queue_t* sq = (segment->kind == MI_SEGMENT_HUGE || mi_segment_is_abandoned(segment) + ? NULL : mi_span_queue_for(slice_count,tld)); + if (slice_count==0) slice_count = 1; + mi_assert_internal(slice_index + slice_count - 1 < segment->slice_entries); + + // set first and last slice (the intermediates can be undetermined) + mi_slice_t* slice = &segment->slices[slice_index]; + slice->slice_count = (uint32_t)slice_count; + mi_assert_internal(slice->slice_count == slice_count); // no overflow? + slice->slice_offset = 0; + if (slice_count > 1) { + mi_slice_t* last = &segment->slices[slice_index + slice_count - 1]; + last->slice_count = 0; + last->slice_offset = (uint32_t)(sizeof(mi_page_t)*(slice_count - 1)); + last->xblock_size = 0; + } + + // perhaps decommit + mi_segment_perhaps_decommit(segment,mi_slice_start(slice),slice_count*MI_SEGMENT_SLICE_SIZE,tld->stats); + + // and push it on the free page queue (if it was not a huge page) + if (sq != NULL) mi_span_queue_push( sq, slice ); + else slice->xblock_size = 0; // mark huge page as free anyways +} + +/* +// called from reclaim to add existing free spans +static void mi_segment_span_add_free(mi_slice_t* slice, mi_segments_tld_t* tld) { + mi_segment_t* segment = _mi_ptr_segment(slice); + mi_assert_internal(slice->xblock_size==0 && slice->slice_count>0 && slice->slice_offset==0); + size_t slice_index = mi_slice_index(slice); + mi_segment_span_free(segment,slice_index,slice->slice_count,tld); +} +*/ + +static void mi_segment_span_remove_from_queue(mi_slice_t* slice, mi_segments_tld_t* tld) { + mi_assert_internal(slice->slice_count > 0 && slice->slice_offset==0 && slice->xblock_size==0); + mi_assert_internal(_mi_ptr_segment(slice)->kind != MI_SEGMENT_HUGE); + mi_span_queue_t* sq = mi_span_queue_for(slice->slice_count, tld); + mi_span_queue_delete(sq, slice); +} + +// note: can be called on abandoned segments +static mi_slice_t* mi_segment_span_free_coalesce(mi_slice_t* slice, mi_segments_tld_t* tld) { + mi_assert_internal(slice != NULL && slice->slice_count > 0 && slice->slice_offset == 0); + mi_segment_t* segment = _mi_ptr_segment(slice); + bool is_abandoned = mi_segment_is_abandoned(segment); + + // for huge pages, just mark as free but don't add to the queues + if (segment->kind == MI_SEGMENT_HUGE) { + mi_assert_internal(segment->used == 1); // decreased right after this call in `mi_segment_page_clear` + slice->xblock_size = 0; // mark as free anyways + // we should mark the last slice `xblock_size=0` now to maintain invariants but we skip it to + // avoid a possible cache miss (and the segment is about to be freed) + return slice; + } + + // otherwise coalesce the span and add to the free span queues + size_t slice_count = slice->slice_count; + mi_slice_t* next = slice + slice->slice_count; + mi_assert_internal(next <= mi_segment_slices_end(segment)); + if (next < mi_segment_slices_end(segment) && next->xblock_size==0) { + // free next block -- remove it from free and merge + mi_assert_internal(next->slice_count > 0 && next->slice_offset==0); + slice_count += next->slice_count; // extend + if (!is_abandoned) { mi_segment_span_remove_from_queue(next, tld); } + } + if (slice > segment->slices) { + mi_slice_t* prev = mi_slice_first(slice - 1); + mi_assert_internal(prev >= segment->slices); + if (prev->xblock_size==0) { + // free previous slice -- remove it from free and merge + mi_assert_internal(prev->slice_count > 0 && prev->slice_offset==0); + slice_count += prev->slice_count; + if (!is_abandoned) { mi_segment_span_remove_from_queue(prev, tld); } + slice = prev; + } + } + + // and add the new free page + mi_segment_span_free(segment, mi_slice_index(slice), slice_count, tld); + return slice; +} + + +static void mi_segment_slice_split(mi_segment_t* segment, mi_slice_t* slice, size_t slice_count, mi_segments_tld_t* tld) { + mi_assert_internal(_mi_ptr_segment(slice)==segment); + mi_assert_internal(slice->slice_count >= slice_count); + mi_assert_internal(slice->xblock_size > 0); // no more in free queue + if (slice->slice_count <= slice_count) return; + mi_assert_internal(segment->kind != MI_SEGMENT_HUGE); + size_t next_index = mi_slice_index(slice) + slice_count; + size_t next_count = slice->slice_count - slice_count; + mi_segment_span_free(segment, next_index, next_count, tld); + slice->slice_count = (uint32_t)slice_count; +} + +// Note: may still return NULL if committing the memory failed +static mi_page_t* mi_segment_span_allocate(mi_segment_t* segment, size_t slice_index, size_t slice_count, mi_segments_tld_t* tld) { + mi_assert_internal(slice_index < segment->slice_entries); + mi_slice_t* slice = &segment->slices[slice_index]; + mi_assert_internal(slice->xblock_size==0 || slice->xblock_size==1); + + // commit before changing the slice data + if (!mi_segment_ensure_committed(segment, _mi_segment_page_start_from_slice(segment, slice, 0, NULL), slice_count * MI_SEGMENT_SLICE_SIZE, tld->stats)) { + return NULL; // commit failed! + } + + // convert the slices to a page + slice->slice_offset = 0; + slice->slice_count = (uint32_t)slice_count; + mi_assert_internal(slice->slice_count == slice_count); + const size_t bsize = slice_count * MI_SEGMENT_SLICE_SIZE; + slice->xblock_size = (uint32_t)(bsize >= MI_HUGE_BLOCK_SIZE ? MI_HUGE_BLOCK_SIZE : bsize); + mi_page_t* page = mi_slice_to_page(slice); + mi_assert_internal(mi_page_block_size(page) == bsize); + + // set slice back pointers for the first MI_MAX_SLICE_OFFSET entries + size_t extra = slice_count-1; + if (extra > MI_MAX_SLICE_OFFSET) extra = MI_MAX_SLICE_OFFSET; + if (slice_index + extra >= segment->slice_entries) extra = segment->slice_entries - slice_index - 1; // huge objects may have more slices than avaiable entries in the segment->slices + slice++; + for (size_t i = 1; i <= extra; i++, slice++) { + slice->slice_offset = (uint32_t)(sizeof(mi_slice_t)*i); + slice->slice_count = 0; + slice->xblock_size = 1; + } + + // and also for the last one (if not set already) (the last one is needed for coalescing) + // note: the cast is needed for ubsan since the index can be larger than MI_SLICES_PER_SEGMENT for huge allocations (see #543) + mi_slice_t* last = &((mi_slice_t*)segment->slices)[slice_index + slice_count - 1]; + if (last < mi_segment_slices_end(segment) && last >= slice) { + last->slice_offset = (uint32_t)(sizeof(mi_slice_t)*(slice_count-1)); + last->slice_count = 0; + last->xblock_size = 1; + } + + // and initialize the page + page->is_reset = false; + page->is_committed = true; + segment->used++; + return page; +} + +static mi_page_t* mi_segments_page_find_and_allocate(size_t slice_count, mi_segments_tld_t* tld) { + mi_assert_internal(slice_count*MI_SEGMENT_SLICE_SIZE <= MI_LARGE_OBJ_SIZE_MAX); + // search from best fit up + mi_span_queue_t* sq = mi_span_queue_for(slice_count, tld); + if (slice_count == 0) slice_count = 1; + while (sq <= &tld->spans[MI_SEGMENT_BIN_MAX]) { + for (mi_slice_t* slice = sq->first; slice != NULL; slice = slice->next) { + if (slice->slice_count >= slice_count) { + // found one + mi_span_queue_delete(sq, slice); + mi_segment_t* segment = _mi_ptr_segment(slice); + if (slice->slice_count > slice_count) { + mi_segment_slice_split(segment, slice, slice_count, tld); + } + mi_assert_internal(slice != NULL && slice->slice_count == slice_count && slice->xblock_size > 0); + mi_page_t* page = mi_segment_span_allocate(segment, mi_slice_index(slice), slice->slice_count, tld); + if (page == NULL) { + // commit failed; return NULL but first restore the slice + mi_segment_span_free_coalesce(slice, tld); + return NULL; + } + return page; + } + } + sq++; + } + // could not find a page.. + return NULL; +} + + +/* ----------------------------------------------------------- + Segment allocation +----------------------------------------------------------- */ + +// Allocate a segment from the OS aligned to `MI_SEGMENT_SIZE` . +static mi_segment_t* mi_segment_init(mi_segment_t* segment, size_t required, mi_segments_tld_t* tld, mi_os_tld_t* os_tld, mi_page_t** huge_page) +{ + mi_assert_internal((required==0 && huge_page==NULL) || (required>0 && huge_page != NULL)); + mi_assert_internal((segment==NULL) || (segment!=NULL && required==0)); + // calculate needed sizes first + size_t info_slices; + size_t pre_size; + const size_t segment_slices = mi_segment_calculate_slices(required, &pre_size, &info_slices); + const size_t slice_entries = (segment_slices > MI_SLICES_PER_SEGMENT ? MI_SLICES_PER_SEGMENT : segment_slices); + const size_t segment_size = segment_slices * MI_SEGMENT_SLICE_SIZE; + + // Commit eagerly only if not the first N lazy segments (to reduce impact of many threads that allocate just a little) + const bool eager_delay = (// !_mi_os_has_overcommit() && // never delay on overcommit systems + _mi_current_thread_count() > 1 && // do not delay for the first N threads + tld->count < (size_t)mi_option_get(mi_option_eager_commit_delay)); + const bool eager = !eager_delay && mi_option_is_enabled(mi_option_eager_commit); + bool commit = eager || (required > 0); + + // Try to get from our cache first + bool is_zero = false; + const bool commit_info_still_good = (segment != NULL); + mi_commit_mask_t commit_mask; + mi_commit_mask_t decommit_mask; + if (segment != NULL) { + commit_mask = segment->commit_mask; + decommit_mask = segment->decommit_mask; + } + else { + mi_commit_mask_create_empty(&commit_mask); + mi_commit_mask_create_empty(&decommit_mask); + } + if (segment==NULL) { + // Allocate the segment from the OS + bool mem_large = (!eager_delay && (MI_SECURE==0)); // only allow large OS pages once we are no longer lazy + bool is_pinned = false; + size_t memid = 0; + segment = (mi_segment_t*)_mi_segment_cache_pop(segment_size, &commit_mask, &decommit_mask, &mem_large, &is_pinned, &is_zero, &memid, os_tld); + if (segment==NULL) { + segment = (mi_segment_t*)_mi_arena_alloc_aligned(segment_size, MI_SEGMENT_SIZE, &commit, &mem_large, &is_pinned, &is_zero, &memid, os_tld); + if (segment == NULL) return NULL; // failed to allocate + if (commit) { + mi_commit_mask_create_full(&commit_mask); + } + else { + mi_commit_mask_create_empty(&commit_mask); + } + } + mi_assert_internal(segment != NULL && (uintptr_t)segment % MI_SEGMENT_SIZE == 0); + + const size_t commit_needed = _mi_divide_up(info_slices*MI_SEGMENT_SLICE_SIZE, MI_COMMIT_SIZE); + mi_assert_internal(commit_needed>0); + mi_commit_mask_t commit_needed_mask; + mi_commit_mask_create(0, commit_needed, &commit_needed_mask); + if (!mi_commit_mask_all_set(&commit_mask, &commit_needed_mask)) { + // at least commit the info slices + mi_assert_internal(commit_needed*MI_COMMIT_SIZE >= info_slices*MI_SEGMENT_SLICE_SIZE); + bool ok = _mi_os_commit(segment, commit_needed*MI_COMMIT_SIZE, &is_zero, tld->stats); + if (!ok) return NULL; // failed to commit + mi_commit_mask_set(&commit_mask, &commit_needed_mask); + } + segment->memid = memid; + segment->mem_is_pinned = is_pinned; + segment->mem_is_large = mem_large; + segment->mem_is_committed = mi_commit_mask_is_full(&commit_mask); + mi_segments_track_size((long)(segment_size), tld); + _mi_segment_map_allocated_at(segment); + } + + // zero the segment info? -- not always needed as it is zero initialized from the OS + mi_atomic_store_ptr_release(mi_segment_t, &segment->abandoned_next, NULL); // tsan + if (!is_zero) { + ptrdiff_t ofs = offsetof(mi_segment_t, next); + size_t prefix = offsetof(mi_segment_t, slices) - ofs; + memset((uint8_t*)segment+ofs, 0, prefix + sizeof(mi_slice_t)*segment_slices); + } + + if (!commit_info_still_good) { + segment->commit_mask = commit_mask; // on lazy commit, the initial part is always committed + segment->allow_decommit = (mi_option_is_enabled(mi_option_allow_decommit) && !segment->mem_is_pinned && !segment->mem_is_large); + if (segment->allow_decommit) { + segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_decommit_delay); + segment->decommit_mask = decommit_mask; + mi_assert_internal(mi_commit_mask_all_set(&segment->commit_mask, &segment->decommit_mask)); + #if MI_DEBUG>2 + const size_t commit_needed = _mi_divide_up(info_slices*MI_SEGMENT_SLICE_SIZE, MI_COMMIT_SIZE); + mi_commit_mask_t commit_needed_mask; + mi_commit_mask_create(0, commit_needed, &commit_needed_mask); + mi_assert_internal(!mi_commit_mask_any_set(&segment->decommit_mask, &commit_needed_mask)); + #endif + } + else { + mi_assert_internal(mi_commit_mask_is_empty(&decommit_mask)); + segment->decommit_expire = 0; + mi_commit_mask_create_empty( &segment->decommit_mask ); + mi_assert_internal(mi_commit_mask_is_empty(&segment->decommit_mask)); + } + } + + + // initialize segment info + segment->segment_slices = segment_slices; + segment->segment_info_slices = info_slices; + segment->thread_id = _mi_thread_id(); + segment->cookie = _mi_ptr_cookie(segment); + segment->slice_entries = slice_entries; + segment->kind = (required == 0 ? MI_SEGMENT_NORMAL : MI_SEGMENT_HUGE); + + // memset(segment->slices, 0, sizeof(mi_slice_t)*(info_slices+1)); + _mi_stat_increase(&tld->stats->page_committed, mi_segment_info_size(segment)); + + // set up guard pages + size_t guard_slices = 0; + if (MI_SECURE>0) { + // in secure mode, we set up a protected page in between the segment info + // and the page data, and at the end of the segment. + size_t os_pagesize = _mi_os_page_size(); + mi_assert_internal(mi_segment_info_size(segment) - os_pagesize >= pre_size); + _mi_os_protect((uint8_t*)segment + mi_segment_info_size(segment) - os_pagesize, os_pagesize); + uint8_t* end = (uint8_t*)segment + mi_segment_size(segment) - os_pagesize; + mi_segment_ensure_committed(segment, end, os_pagesize, tld->stats); + _mi_os_protect(end, os_pagesize); + if (slice_entries == segment_slices) segment->slice_entries--; // don't use the last slice :-( + guard_slices = 1; + } + + // reserve first slices for segment info + mi_page_t* page0 = mi_segment_span_allocate(segment, 0, info_slices, tld); + mi_assert_internal(page0!=NULL); if (page0==NULL) return NULL; // cannot fail as we always commit in advance + mi_assert_internal(segment->used == 1); + segment->used = 0; // don't count our internal slices towards usage + + // initialize initial free pages + if (segment->kind == MI_SEGMENT_NORMAL) { // not a huge page + mi_assert_internal(huge_page==NULL); + mi_segment_span_free(segment, info_slices, segment->slice_entries - info_slices, tld); + } + else { + mi_assert_internal(huge_page!=NULL); + mi_assert_internal(mi_commit_mask_is_empty(&segment->decommit_mask)); + mi_assert_internal(mi_commit_mask_is_full(&segment->commit_mask)); + *huge_page = mi_segment_span_allocate(segment, info_slices, segment_slices - info_slices - guard_slices, tld); + mi_assert_internal(*huge_page != NULL); // cannot fail as we commit in advance + } + + mi_assert_expensive(mi_segment_is_valid(segment,tld)); + return segment; +} + + +// Allocate a segment from the OS aligned to `MI_SEGMENT_SIZE` . +static mi_segment_t* mi_segment_alloc(size_t required, mi_segments_tld_t* tld, mi_os_tld_t* os_tld, mi_page_t** huge_page) { + return mi_segment_init(NULL, required, tld, os_tld, huge_page); +} + + +static void mi_segment_free(mi_segment_t* segment, bool force, mi_segments_tld_t* tld) { + MI_UNUSED(force); + mi_assert_internal(segment != NULL); + mi_assert_internal(segment->next == NULL); + mi_assert_internal(segment->used == 0); + + // Remove the free pages + mi_slice_t* slice = &segment->slices[0]; + const mi_slice_t* end = mi_segment_slices_end(segment); + size_t page_count = 0; + while (slice < end) { + mi_assert_internal(slice->slice_count > 0); + mi_assert_internal(slice->slice_offset == 0); + mi_assert_internal(mi_slice_index(slice)==0 || slice->xblock_size == 0); // no more used pages .. + if (slice->xblock_size == 0 && segment->kind != MI_SEGMENT_HUGE) { + mi_segment_span_remove_from_queue(slice, tld); + } + page_count++; + slice = slice + slice->slice_count; + } + mi_assert_internal(page_count == 2); // first page is allocated by the segment itself + + // stats + _mi_stat_decrease(&tld->stats->page_committed, mi_segment_info_size(segment)); + + // return it to the OS + mi_segment_os_free(segment, tld); +} + + +/* ----------------------------------------------------------- + Page Free +----------------------------------------------------------- */ + +static void mi_segment_abandon(mi_segment_t* segment, mi_segments_tld_t* tld); + +// note: can be called on abandoned pages +static mi_slice_t* mi_segment_page_clear(mi_page_t* page, mi_segments_tld_t* tld) { + mi_assert_internal(page->xblock_size > 0); + mi_assert_internal(mi_page_all_free(page)); + mi_segment_t* segment = _mi_ptr_segment(page); + mi_assert_internal(segment->used > 0); + + size_t inuse = page->capacity * mi_page_block_size(page); + _mi_stat_decrease(&tld->stats->page_committed, inuse); + _mi_stat_decrease(&tld->stats->pages, 1); + + // reset the page memory to reduce memory pressure? + if (!segment->mem_is_pinned && !page->is_reset && mi_option_is_enabled(mi_option_page_reset)) { + size_t psize; + uint8_t* start = _mi_page_start(segment, page, &psize); + page->is_reset = true; + _mi_os_reset(start, psize, tld->stats); + } + + // zero the page data, but not the segment fields + page->is_zero_init = false; + ptrdiff_t ofs = offsetof(mi_page_t, capacity); + memset((uint8_t*)page + ofs, 0, sizeof(*page) - ofs); + page->xblock_size = 1; + + // and free it + mi_slice_t* slice = mi_segment_span_free_coalesce(mi_page_to_slice(page), tld); + segment->used--; + // cannot assert segment valid as it is called during reclaim + // mi_assert_expensive(mi_segment_is_valid(segment, tld)); + return slice; +} + +void _mi_segment_page_free(mi_page_t* page, bool force, mi_segments_tld_t* tld) +{ + mi_assert(page != NULL); + + mi_segment_t* segment = _mi_page_segment(page); + mi_assert_expensive(mi_segment_is_valid(segment,tld)); + + // mark it as free now + mi_segment_page_clear(page, tld); + mi_assert_expensive(mi_segment_is_valid(segment, tld)); + + if (segment->used == 0) { + // no more used pages; remove from the free list and free the segment + mi_segment_free(segment, force, tld); + } + else if (segment->used == segment->abandoned) { + // only abandoned pages; remove from free list and abandon + mi_segment_abandon(segment,tld); + } +} + + +/* ----------------------------------------------------------- +Abandonment + +When threads terminate, they can leave segments with +live blocks (reachable through other threads). Such segments +are "abandoned" and will be reclaimed by other threads to +reuse their pages and/or free them eventually + +We maintain a global list of abandoned segments that are +reclaimed on demand. Since this is shared among threads +the implementation needs to avoid the A-B-A problem on +popping abandoned segments: +We use tagged pointers to avoid accidentially identifying +reused segments, much like stamped references in Java. +Secondly, we maintain a reader counter to avoid resetting +or decommitting segments that have a pending read operation. + +Note: the current implementation is one possible design; +another way might be to keep track of abandoned segments +in the arenas/segment_cache's. This would have the advantage of keeping +all concurrent code in one place and not needing to deal +with ABA issues. The drawback is that it is unclear how to +scan abandoned segments efficiently in that case as they +would be spread among all other segments in the arenas. +----------------------------------------------------------- */ + +// Use the bottom 20-bits (on 64-bit) of the aligned segment pointers +// to put in a tag that increments on update to avoid the A-B-A problem. +#define MI_TAGGED_MASK MI_SEGMENT_MASK +typedef uintptr_t mi_tagged_segment_t; + +static mi_segment_t* mi_tagged_segment_ptr(mi_tagged_segment_t ts) { + return (mi_segment_t*)(ts & ~MI_TAGGED_MASK); +} + +static mi_tagged_segment_t mi_tagged_segment(mi_segment_t* segment, mi_tagged_segment_t ts) { + mi_assert_internal(((uintptr_t)segment & MI_TAGGED_MASK) == 0); + uintptr_t tag = ((ts & MI_TAGGED_MASK) + 1) & MI_TAGGED_MASK; + return ((uintptr_t)segment | tag); +} + +// This is a list of visited abandoned pages that were full at the time. +// this list migrates to `abandoned` when that becomes NULL. The use of +// this list reduces contention and the rate at which segments are visited. +static mi_decl_cache_align _Atomic(mi_segment_t*) abandoned_visited; // = NULL + +// The abandoned page list (tagged as it supports pop) +static mi_decl_cache_align _Atomic(mi_tagged_segment_t) abandoned; // = NULL + +// Maintain these for debug purposes (these counts may be a bit off) +static mi_decl_cache_align _Atomic(size_t) abandoned_count; +static mi_decl_cache_align _Atomic(size_t) abandoned_visited_count; + +// We also maintain a count of current readers of the abandoned list +// in order to prevent resetting/decommitting segment memory if it might +// still be read. +static mi_decl_cache_align _Atomic(size_t) abandoned_readers; // = 0 + +// Push on the visited list +static void mi_abandoned_visited_push(mi_segment_t* segment) { + mi_assert_internal(segment->thread_id == 0); + mi_assert_internal(mi_atomic_load_ptr_relaxed(mi_segment_t,&segment->abandoned_next) == NULL); + mi_assert_internal(segment->next == NULL); + mi_assert_internal(segment->used > 0); + mi_segment_t* anext = mi_atomic_load_ptr_relaxed(mi_segment_t, &abandoned_visited); + do { + mi_atomic_store_ptr_release(mi_segment_t, &segment->abandoned_next, anext); + } while (!mi_atomic_cas_ptr_weak_release(mi_segment_t, &abandoned_visited, &anext, segment)); + mi_atomic_increment_relaxed(&abandoned_visited_count); +} + +// Move the visited list to the abandoned list. +static bool mi_abandoned_visited_revisit(void) +{ + // quick check if the visited list is empty + if (mi_atomic_load_ptr_relaxed(mi_segment_t, &abandoned_visited) == NULL) return false; + + // grab the whole visited list + mi_segment_t* first = mi_atomic_exchange_ptr_acq_rel(mi_segment_t, &abandoned_visited, NULL); + if (first == NULL) return false; + + // first try to swap directly if the abandoned list happens to be NULL + mi_tagged_segment_t afirst; + mi_tagged_segment_t ts = mi_atomic_load_relaxed(&abandoned); + if (mi_tagged_segment_ptr(ts)==NULL) { + size_t count = mi_atomic_load_relaxed(&abandoned_visited_count); + afirst = mi_tagged_segment(first, ts); + if (mi_atomic_cas_strong_acq_rel(&abandoned, &ts, afirst)) { + mi_atomic_add_relaxed(&abandoned_count, count); + mi_atomic_sub_relaxed(&abandoned_visited_count, count); + return true; + } + } + + // find the last element of the visited list: O(n) + mi_segment_t* last = first; + mi_segment_t* next; + while ((next = mi_atomic_load_ptr_relaxed(mi_segment_t, &last->abandoned_next)) != NULL) { + last = next; + } + + // and atomically prepend to the abandoned list + // (no need to increase the readers as we don't access the abandoned segments) + mi_tagged_segment_t anext = mi_atomic_load_relaxed(&abandoned); + size_t count; + do { + count = mi_atomic_load_relaxed(&abandoned_visited_count); + mi_atomic_store_ptr_release(mi_segment_t, &last->abandoned_next, mi_tagged_segment_ptr(anext)); + afirst = mi_tagged_segment(first, anext); + } while (!mi_atomic_cas_weak_release(&abandoned, &anext, afirst)); + mi_atomic_add_relaxed(&abandoned_count, count); + mi_atomic_sub_relaxed(&abandoned_visited_count, count); + return true; +} + +// Push on the abandoned list. +static void mi_abandoned_push(mi_segment_t* segment) { + mi_assert_internal(segment->thread_id == 0); + mi_assert_internal(mi_atomic_load_ptr_relaxed(mi_segment_t, &segment->abandoned_next) == NULL); + mi_assert_internal(segment->next == NULL); + mi_assert_internal(segment->used > 0); + mi_tagged_segment_t next; + mi_tagged_segment_t ts = mi_atomic_load_relaxed(&abandoned); + do { + mi_atomic_store_ptr_release(mi_segment_t, &segment->abandoned_next, mi_tagged_segment_ptr(ts)); + next = mi_tagged_segment(segment, ts); + } while (!mi_atomic_cas_weak_release(&abandoned, &ts, next)); + mi_atomic_increment_relaxed(&abandoned_count); +} + +// Wait until there are no more pending reads on segments that used to be in the abandoned list +// called for example from `arena.c` before decommitting +void _mi_abandoned_await_readers(void) { + size_t n; + do { + n = mi_atomic_load_acquire(&abandoned_readers); + if (n != 0) mi_atomic_yield(); + } while (n != 0); +} + +// Pop from the abandoned list +static mi_segment_t* mi_abandoned_pop(void) { + mi_segment_t* segment; + // Check efficiently if it is empty (or if the visited list needs to be moved) + mi_tagged_segment_t ts = mi_atomic_load_relaxed(&abandoned); + segment = mi_tagged_segment_ptr(ts); + if (mi_likely(segment == NULL)) { + if (mi_likely(!mi_abandoned_visited_revisit())) { // try to swap in the visited list on NULL + return NULL; + } + } + + // Do a pop. We use a reader count to prevent + // a segment to be decommitted while a read is still pending, + // and a tagged pointer to prevent A-B-A link corruption. + // (this is called from `region.c:_mi_mem_free` for example) + mi_atomic_increment_relaxed(&abandoned_readers); // ensure no segment gets decommitted + mi_tagged_segment_t next = 0; + ts = mi_atomic_load_acquire(&abandoned); + do { + segment = mi_tagged_segment_ptr(ts); + if (segment != NULL) { + mi_segment_t* anext = mi_atomic_load_ptr_relaxed(mi_segment_t, &segment->abandoned_next); + next = mi_tagged_segment(anext, ts); // note: reads the segment's `abandoned_next` field so should not be decommitted + } + } while (segment != NULL && !mi_atomic_cas_weak_acq_rel(&abandoned, &ts, next)); + mi_atomic_decrement_relaxed(&abandoned_readers); // release reader lock + if (segment != NULL) { + mi_atomic_store_ptr_release(mi_segment_t, &segment->abandoned_next, NULL); + mi_atomic_decrement_relaxed(&abandoned_count); + } + return segment; +} + +/* ----------------------------------------------------------- + Abandon segment/page +----------------------------------------------------------- */ + +static void mi_segment_abandon(mi_segment_t* segment, mi_segments_tld_t* tld) { + mi_assert_internal(segment->used == segment->abandoned); + mi_assert_internal(segment->used > 0); + mi_assert_internal(mi_atomic_load_ptr_relaxed(mi_segment_t, &segment->abandoned_next) == NULL); + mi_assert_internal(segment->abandoned_visits == 0); + mi_assert_expensive(mi_segment_is_valid(segment,tld)); + + // remove the free pages from the free page queues + mi_slice_t* slice = &segment->slices[0]; + const mi_slice_t* end = mi_segment_slices_end(segment); + while (slice < end) { + mi_assert_internal(slice->slice_count > 0); + mi_assert_internal(slice->slice_offset == 0); + if (slice->xblock_size == 0) { // a free page + mi_segment_span_remove_from_queue(slice,tld); + slice->xblock_size = 0; // but keep it free + } + slice = slice + slice->slice_count; + } + + // perform delayed decommits + mi_segment_delayed_decommit(segment, mi_option_is_enabled(mi_option_abandoned_page_decommit) /* force? */, tld->stats); + + // all pages in the segment are abandoned; add it to the abandoned list + _mi_stat_increase(&tld->stats->segments_abandoned, 1); + mi_segments_track_size(-((long)mi_segment_size(segment)), tld); + segment->thread_id = 0; + mi_atomic_store_ptr_release(mi_segment_t, &segment->abandoned_next, NULL); + segment->abandoned_visits = 1; // from 0 to 1 to signify it is abandoned + mi_abandoned_push(segment); +} + +void _mi_segment_page_abandon(mi_page_t* page, mi_segments_tld_t* tld) { + mi_assert(page != NULL); + mi_assert_internal(mi_page_thread_free_flag(page)==MI_NEVER_DELAYED_FREE); + mi_assert_internal(mi_page_heap(page) == NULL); + mi_segment_t* segment = _mi_page_segment(page); + + mi_assert_expensive(mi_segment_is_valid(segment,tld)); + segment->abandoned++; + + _mi_stat_increase(&tld->stats->pages_abandoned, 1); + mi_assert_internal(segment->abandoned <= segment->used); + if (segment->used == segment->abandoned) { + // all pages are abandoned, abandon the entire segment + mi_segment_abandon(segment, tld); + } +} + +/* ----------------------------------------------------------- + Reclaim abandoned pages +----------------------------------------------------------- */ + +static mi_slice_t* mi_slices_start_iterate(mi_segment_t* segment, const mi_slice_t** end) { + mi_slice_t* slice = &segment->slices[0]; + *end = mi_segment_slices_end(segment); + mi_assert_internal(slice->slice_count>0 && slice->xblock_size>0); // segment allocated page + slice = slice + slice->slice_count; // skip the first segment allocated page + return slice; +} + +// Possibly free pages and check if free space is available +static bool mi_segment_check_free(mi_segment_t* segment, size_t slices_needed, size_t block_size, mi_segments_tld_t* tld) +{ + mi_assert_internal(block_size < MI_HUGE_BLOCK_SIZE); + mi_assert_internal(mi_segment_is_abandoned(segment)); + bool has_page = false; + + // for all slices + const mi_slice_t* end; + mi_slice_t* slice = mi_slices_start_iterate(segment, &end); + while (slice < end) { + mi_assert_internal(slice->slice_count > 0); + mi_assert_internal(slice->slice_offset == 0); + if (mi_slice_is_used(slice)) { // used page + // ensure used count is up to date and collect potential concurrent frees + mi_page_t* const page = mi_slice_to_page(slice); + _mi_page_free_collect(page, false); + if (mi_page_all_free(page)) { + // if this page is all free now, free it without adding to any queues (yet) + mi_assert_internal(page->next == NULL && page->prev==NULL); + _mi_stat_decrease(&tld->stats->pages_abandoned, 1); + segment->abandoned--; + slice = mi_segment_page_clear(page, tld); // re-assign slice due to coalesce! + mi_assert_internal(!mi_slice_is_used(slice)); + if (slice->slice_count >= slices_needed) { + has_page = true; + } + } + else { + if (page->xblock_size == block_size && mi_page_has_any_available(page)) { + // a page has available free blocks of the right size + has_page = true; + } + } + } + else { + // empty span + if (slice->slice_count >= slices_needed) { + has_page = true; + } + } + slice = slice + slice->slice_count; + } + return has_page; +} + +// Reclaim an abandoned segment; returns NULL if the segment was freed +// set `right_page_reclaimed` to `true` if it reclaimed a page of the right `block_size` that was not full. +static mi_segment_t* mi_segment_reclaim(mi_segment_t* segment, mi_heap_t* heap, size_t requested_block_size, bool* right_page_reclaimed, mi_segments_tld_t* tld) { + mi_assert_internal(mi_atomic_load_ptr_relaxed(mi_segment_t, &segment->abandoned_next) == NULL); + mi_assert_expensive(mi_segment_is_valid(segment, tld)); + if (right_page_reclaimed != NULL) { *right_page_reclaimed = false; } + + segment->thread_id = _mi_thread_id(); + segment->abandoned_visits = 0; + mi_segments_track_size((long)mi_segment_size(segment), tld); + mi_assert_internal(segment->next == NULL); + _mi_stat_decrease(&tld->stats->segments_abandoned, 1); + + // for all slices + const mi_slice_t* end; + mi_slice_t* slice = mi_slices_start_iterate(segment, &end); + while (slice < end) { + mi_assert_internal(slice->slice_count > 0); + mi_assert_internal(slice->slice_offset == 0); + if (mi_slice_is_used(slice)) { + // in use: reclaim the page in our heap + mi_page_t* page = mi_slice_to_page(slice); + mi_assert_internal(!page->is_reset); + mi_assert_internal(page->is_committed); + mi_assert_internal(mi_page_thread_free_flag(page)==MI_NEVER_DELAYED_FREE); + mi_assert_internal(mi_page_heap(page) == NULL); + mi_assert_internal(page->next == NULL && page->prev==NULL); + _mi_stat_decrease(&tld->stats->pages_abandoned, 1); + segment->abandoned--; + // set the heap again and allow delayed free again + mi_page_set_heap(page, heap); + _mi_page_use_delayed_free(page, MI_USE_DELAYED_FREE, true); // override never (after heap is set) + _mi_page_free_collect(page, false); // ensure used count is up to date + if (mi_page_all_free(page)) { + // if everything free by now, free the page + slice = mi_segment_page_clear(page, tld); // set slice again due to coalesceing + } + else { + // otherwise reclaim it into the heap + _mi_page_reclaim(heap, page); + if (requested_block_size == page->xblock_size && mi_page_has_any_available(page)) { + if (right_page_reclaimed != NULL) { *right_page_reclaimed = true; } + } + } + } + else { + // the span is free, add it to our page queues + slice = mi_segment_span_free_coalesce(slice, tld); // set slice again due to coalesceing + } + mi_assert_internal(slice->slice_count>0 && slice->slice_offset==0); + slice = slice + slice->slice_count; + } + + mi_assert(segment->abandoned == 0); + if (segment->used == 0) { // due to page_clear + mi_assert_internal(right_page_reclaimed == NULL || !(*right_page_reclaimed)); + mi_segment_free(segment, false, tld); + return NULL; + } + else { + return segment; + } +} + + +void _mi_abandoned_reclaim_all(mi_heap_t* heap, mi_segments_tld_t* tld) { + mi_segment_t* segment; + while ((segment = mi_abandoned_pop()) != NULL) { + mi_segment_reclaim(segment, heap, 0, NULL, tld); + } +} + +static mi_segment_t* mi_segment_try_reclaim(mi_heap_t* heap, size_t needed_slices, size_t block_size, bool* reclaimed, mi_segments_tld_t* tld) +{ + *reclaimed = false; + mi_segment_t* segment; + long max_tries = mi_option_get_clamp(mi_option_max_segment_reclaim, 8, 1024); // limit the work to bound allocation times + while ((max_tries-- > 0) && ((segment = mi_abandoned_pop()) != NULL)) { + segment->abandoned_visits++; + bool has_page = mi_segment_check_free(segment,needed_slices,block_size,tld); // try to free up pages (due to concurrent frees) + if (segment->used == 0) { + // free the segment (by forced reclaim) to make it available to other threads. + // note1: we prefer to free a segment as that might lead to reclaiming another + // segment that is still partially used. + // note2: we could in principle optimize this by skipping reclaim and directly + // freeing but that would violate some invariants temporarily) + mi_segment_reclaim(segment, heap, 0, NULL, tld); + } + else if (has_page) { + // found a large enough free span, or a page of the right block_size with free space + // we return the result of reclaim (which is usually `segment`) as it might free + // the segment due to concurrent frees (in which case `NULL` is returned). + return mi_segment_reclaim(segment, heap, block_size, reclaimed, tld); + } + else if (segment->abandoned_visits > 3) { + // always reclaim on 3rd visit to limit the abandoned queue length. + mi_segment_reclaim(segment, heap, 0, NULL, tld); + } + else { + // otherwise, push on the visited list so it gets not looked at too quickly again + mi_segment_delayed_decommit(segment, true /* force? */, tld->stats); // forced decommit if needed as we may not visit soon again + mi_abandoned_visited_push(segment); + } + } + return NULL; +} + + +void _mi_abandoned_collect(mi_heap_t* heap, bool force, mi_segments_tld_t* tld) +{ + mi_segment_t* segment; + int max_tries = (force ? 16*1024 : 1024); // limit latency + if (force) { + mi_abandoned_visited_revisit(); + } + while ((max_tries-- > 0) && ((segment = mi_abandoned_pop()) != NULL)) { + mi_segment_check_free(segment,0,0,tld); // try to free up pages (due to concurrent frees) + if (segment->used == 0) { + // free the segment (by forced reclaim) to make it available to other threads. + // note: we could in principle optimize this by skipping reclaim and directly + // freeing but that would violate some invariants temporarily) + mi_segment_reclaim(segment, heap, 0, NULL, tld); + } + else { + // otherwise, decommit if needed and push on the visited list + // note: forced decommit can be expensive if many threads are destroyed/created as in mstress. + mi_segment_delayed_decommit(segment, force, tld->stats); + mi_abandoned_visited_push(segment); + } + } +} + +/* ----------------------------------------------------------- + Reclaim or allocate +----------------------------------------------------------- */ + +static mi_segment_t* mi_segment_reclaim_or_alloc(mi_heap_t* heap, size_t needed_slices, size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) +{ + mi_assert_internal(block_size < MI_HUGE_BLOCK_SIZE); + mi_assert_internal(block_size <= MI_LARGE_OBJ_SIZE_MAX); + + // 1. try to reclaim an abandoned segment + bool reclaimed; + mi_segment_t* segment = mi_segment_try_reclaim(heap, needed_slices, block_size, &reclaimed, tld); + if (reclaimed) { + // reclaimed the right page right into the heap + mi_assert_internal(segment != NULL); + return NULL; // pretend out-of-memory as the page will be in the page queue of the heap with available blocks + } + else if (segment != NULL) { + // reclaimed a segment with a large enough empty span in it + return segment; + } + // 2. otherwise allocate a fresh segment + return mi_segment_alloc(0, tld, os_tld, NULL); +} + + +/* ----------------------------------------------------------- + Page allocation +----------------------------------------------------------- */ + +static mi_page_t* mi_segments_page_alloc(mi_heap_t* heap, mi_page_kind_t page_kind, size_t required, size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) +{ + mi_assert_internal(required <= MI_LARGE_OBJ_SIZE_MAX && page_kind <= MI_PAGE_LARGE); + + // find a free page + size_t page_size = _mi_align_up(required, (required > MI_MEDIUM_PAGE_SIZE ? MI_MEDIUM_PAGE_SIZE : MI_SEGMENT_SLICE_SIZE)); + size_t slices_needed = page_size / MI_SEGMENT_SLICE_SIZE; + mi_assert_internal(slices_needed * MI_SEGMENT_SLICE_SIZE == page_size); + mi_page_t* page = mi_segments_page_find_and_allocate(slices_needed, tld); //(required <= MI_SMALL_SIZE_MAX ? 0 : slices_needed), tld); + if (page==NULL) { + // no free page, allocate a new segment and try again + if (mi_segment_reclaim_or_alloc(heap, slices_needed, block_size, tld, os_tld) == NULL) { + // OOM or reclaimed a good page in the heap + return NULL; + } + else { + // otherwise try again + return mi_segments_page_alloc(heap, page_kind, required, block_size, tld, os_tld); + } + } + mi_assert_internal(page != NULL && page->slice_count*MI_SEGMENT_SLICE_SIZE == page_size); + mi_assert_internal(_mi_ptr_segment(page)->thread_id == _mi_thread_id()); + mi_segment_delayed_decommit(_mi_ptr_segment(page), false, tld->stats); + return page; +} + + + +/* ----------------------------------------------------------- + Huge page allocation +----------------------------------------------------------- */ + +static mi_page_t* mi_segment_huge_page_alloc(size_t size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) +{ + mi_page_t* page = NULL; + mi_segment_t* segment = mi_segment_alloc(size,tld,os_tld,&page); + if (segment == NULL || page==NULL) return NULL; + mi_assert_internal(segment->used==1); + mi_assert_internal(mi_page_block_size(page) >= size); + segment->thread_id = 0; // huge segments are immediately abandoned + return page; +} + +// free huge block from another thread +void _mi_segment_huge_page_free(mi_segment_t* segment, mi_page_t* page, mi_block_t* block) { + // huge page segments are always abandoned and can be freed immediately by any thread + mi_assert_internal(segment->kind==MI_SEGMENT_HUGE); + mi_assert_internal(segment == _mi_page_segment(page)); + mi_assert_internal(mi_atomic_load_relaxed(&segment->thread_id)==0); + + // claim it and free + mi_heap_t* heap = mi_heap_get_default(); // issue #221; don't use the internal get_default_heap as we need to ensure the thread is initialized. + // paranoia: if this it the last reference, the cas should always succeed + size_t expected_tid = 0; + if (mi_atomic_cas_strong_acq_rel(&segment->thread_id, &expected_tid, heap->thread_id)) { + mi_block_set_next(page, block, page->free); + page->free = block; + page->used--; + page->is_zero = false; + mi_assert(page->used == 0); + mi_tld_t* tld = heap->tld; + _mi_segment_page_free(page, true, &tld->segments); + } +#if (MI_DEBUG!=0) + else { + mi_assert_internal(false); + } +#endif +} + +/* ----------------------------------------------------------- + Page allocation and free +----------------------------------------------------------- */ +mi_page_t* _mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) { + mi_page_t* page; + if (block_size <= MI_SMALL_OBJ_SIZE_MAX) { + page = mi_segments_page_alloc(heap,MI_PAGE_SMALL,block_size,block_size,tld,os_tld); + } + else if (block_size <= MI_MEDIUM_OBJ_SIZE_MAX) { + page = mi_segments_page_alloc(heap,MI_PAGE_MEDIUM,MI_MEDIUM_PAGE_SIZE,block_size,tld, os_tld); + } + else if (block_size <= MI_LARGE_OBJ_SIZE_MAX) { + page = mi_segments_page_alloc(heap,MI_PAGE_LARGE,block_size,block_size,tld, os_tld); + } + else { + page = mi_segment_huge_page_alloc(block_size,tld,os_tld); + } + mi_assert_expensive(page == NULL || mi_segment_is_valid(_mi_page_segment(page),tld)); + return page; +} diff --git a/compat/mimalloc/stats.c b/compat/mimalloc/stats.c new file mode 100644 index 00000000000000..9ff4485be7decc --- /dev/null +++ b/compat/mimalloc/stats.c @@ -0,0 +1,583 @@ +/* ---------------------------------------------------------------------------- +Copyright (c) 2018-2021, Microsoft Research, Daan Leijen +This is free software; you can redistribute it and/or modify it under the +terms of the MIT license. A copy of the license can be found in the file +"LICENSE" at the root of this distribution. +-----------------------------------------------------------------------------*/ +#include "mimalloc.h" +#include "mimalloc-internal.h" +#include "mimalloc-atomic.h" + +#include // fputs, stderr +#include // memset + +#if defined(_MSC_VER) && (_MSC_VER < 1920) +#pragma warning(disable:4204) // non-constant aggregate initializer +#endif + +/* ----------------------------------------------------------- + Statistics operations +----------------------------------------------------------- */ + +static bool mi_is_in_main(void* stat) { + return ((uint8_t*)stat >= (uint8_t*)&_mi_stats_main + && (uint8_t*)stat < ((uint8_t*)&_mi_stats_main + sizeof(mi_stats_t))); +} + +static void mi_stat_update(mi_stat_count_t* stat, int64_t amount) { + if (amount == 0) return; + if (mi_is_in_main(stat)) + { + // add atomically (for abandoned pages) + int64_t current = mi_atomic_addi64_relaxed(&stat->current, amount); + mi_atomic_maxi64_relaxed(&stat->peak, current + amount); + if (amount > 0) { + mi_atomic_addi64_relaxed(&stat->allocated,amount); + } + else { + mi_atomic_addi64_relaxed(&stat->freed, -amount); + } + } + else { + // add thread local + stat->current += amount; + if (stat->current > stat->peak) stat->peak = stat->current; + if (amount > 0) { + stat->allocated += amount; + } + else { + stat->freed += -amount; + } + } +} + +void _mi_stat_counter_increase(mi_stat_counter_t* stat, size_t amount) { + if (mi_is_in_main(stat)) { + mi_atomic_addi64_relaxed( &stat->count, 1 ); + mi_atomic_addi64_relaxed( &stat->total, (int64_t)amount ); + } + else { + stat->count++; + stat->total += amount; + } +} + +void _mi_stat_increase(mi_stat_count_t* stat, size_t amount) { + mi_stat_update(stat, (int64_t)amount); +} + +void _mi_stat_decrease(mi_stat_count_t* stat, size_t amount) { + mi_stat_update(stat, -((int64_t)amount)); +} + +// must be thread safe as it is called from stats_merge +static void mi_stat_add(mi_stat_count_t* stat, const mi_stat_count_t* src, int64_t unit) { + if (stat==src) return; + if (src->allocated==0 && src->freed==0) return; + mi_atomic_addi64_relaxed( &stat->allocated, src->allocated * unit); + mi_atomic_addi64_relaxed( &stat->current, src->current * unit); + mi_atomic_addi64_relaxed( &stat->freed, src->freed * unit); + // peak scores do not work across threads.. + mi_atomic_addi64_relaxed( &stat->peak, src->peak * unit); +} + +static void mi_stat_counter_add(mi_stat_counter_t* stat, const mi_stat_counter_t* src, int64_t unit) { + if (stat==src) return; + mi_atomic_addi64_relaxed( &stat->total, src->total * unit); + mi_atomic_addi64_relaxed( &stat->count, src->count * unit); +} + +// must be thread safe as it is called from stats_merge +static void mi_stats_add(mi_stats_t* stats, const mi_stats_t* src) { + if (stats==src) return; + mi_stat_add(&stats->segments, &src->segments,1); + mi_stat_add(&stats->pages, &src->pages,1); + mi_stat_add(&stats->reserved, &src->reserved, 1); + mi_stat_add(&stats->committed, &src->committed, 1); + mi_stat_add(&stats->reset, &src->reset, 1); + mi_stat_add(&stats->page_committed, &src->page_committed, 1); + + mi_stat_add(&stats->pages_abandoned, &src->pages_abandoned, 1); + mi_stat_add(&stats->segments_abandoned, &src->segments_abandoned, 1); + mi_stat_add(&stats->threads, &src->threads, 1); + + mi_stat_add(&stats->malloc, &src->malloc, 1); + mi_stat_add(&stats->segments_cache, &src->segments_cache, 1); + mi_stat_add(&stats->normal, &src->normal, 1); + mi_stat_add(&stats->huge, &src->huge, 1); + mi_stat_add(&stats->large, &src->large, 1); + + mi_stat_counter_add(&stats->pages_extended, &src->pages_extended, 1); + mi_stat_counter_add(&stats->mmap_calls, &src->mmap_calls, 1); + mi_stat_counter_add(&stats->commit_calls, &src->commit_calls, 1); + + mi_stat_counter_add(&stats->page_no_retire, &src->page_no_retire, 1); + mi_stat_counter_add(&stats->searches, &src->searches, 1); + mi_stat_counter_add(&stats->normal_count, &src->normal_count, 1); + mi_stat_counter_add(&stats->huge_count, &src->huge_count, 1); + mi_stat_counter_add(&stats->large_count, &src->large_count, 1); +#if MI_STAT>1 + for (size_t i = 0; i <= MI_BIN_HUGE; i++) { + if (src->normal_bins[i].allocated > 0 || src->normal_bins[i].freed > 0) { + mi_stat_add(&stats->normal_bins[i], &src->normal_bins[i], 1); + } + } +#endif +} + +/* ----------------------------------------------------------- + Display statistics +----------------------------------------------------------- */ + +// unit > 0 : size in binary bytes +// unit == 0: count as decimal +// unit < 0 : count in binary +static void mi_printf_amount(int64_t n, int64_t unit, mi_output_fun* out, void* arg, const char* fmt) { + char buf[32]; buf[0] = 0; + int len = 32; + const char* suffix = (unit <= 0 ? " " : "B"); + const int64_t base = (unit == 0 ? 1000 : 1024); + if (unit>0) n *= unit; + + const int64_t pos = (n < 0 ? -n : n); + if (pos < base) { + if (n!=1 || suffix[0] != 'B') { // skip printing 1 B for the unit column + snprintf(buf, len, "%d %-3s", (int)n, (n==0 ? "" : suffix)); + } + } + else { + int64_t divider = base; + const char* magnitude = "K"; + if (pos >= divider*base) { divider *= base; magnitude = "M"; } + if (pos >= divider*base) { divider *= base; magnitude = "G"; } + const int64_t tens = (n / (divider/10)); + const long whole = (long)(tens/10); + const long frac1 = (long)(tens%10); + char unitdesc[8]; + snprintf(unitdesc, 8, "%s%s%s", magnitude, (base==1024 ? "i" : ""), suffix); + snprintf(buf, len, "%ld.%ld %-3s", whole, (frac1 < 0 ? -frac1 : frac1), unitdesc); + } + _mi_fprintf(out, arg, (fmt==NULL ? "%11s" : fmt), buf); +} + + +static void mi_print_amount(int64_t n, int64_t unit, mi_output_fun* out, void* arg) { + mi_printf_amount(n,unit,out,arg,NULL); +} + +static void mi_print_count(int64_t n, int64_t unit, mi_output_fun* out, void* arg) { + if (unit==1) _mi_fprintf(out, arg, "%11s"," "); + else mi_print_amount(n,0,out,arg); +} + +static void mi_stat_print(const mi_stat_count_t* stat, const char* msg, int64_t unit, mi_output_fun* out, void* arg ) { + _mi_fprintf(out, arg,"%10s:", msg); + if (unit>0) { + mi_print_amount(stat->peak, unit, out, arg); + mi_print_amount(stat->allocated, unit, out, arg); + mi_print_amount(stat->freed, unit, out, arg); + mi_print_amount(stat->current, unit, out, arg); + mi_print_amount(unit, 1, out, arg); + mi_print_count(stat->allocated, unit, out, arg); + if (stat->allocated > stat->freed) + _mi_fprintf(out, arg, " not all freed!\n"); + else + _mi_fprintf(out, arg, " ok\n"); + } + else if (unit<0) { + mi_print_amount(stat->peak, -1, out, arg); + mi_print_amount(stat->allocated, -1, out, arg); + mi_print_amount(stat->freed, -1, out, arg); + mi_print_amount(stat->current, -1, out, arg); + if (unit==-1) { + _mi_fprintf(out, arg, "%22s", ""); + } + else { + mi_print_amount(-unit, 1, out, arg); + mi_print_count((stat->allocated / -unit), 0, out, arg); + } + if (stat->allocated > stat->freed) + _mi_fprintf(out, arg, " not all freed!\n"); + else + _mi_fprintf(out, arg, " ok\n"); + } + else { + mi_print_amount(stat->peak, 1, out, arg); + mi_print_amount(stat->allocated, 1, out, arg); + _mi_fprintf(out, arg, "%11s", " "); // no freed + mi_print_amount(stat->current, 1, out, arg); + _mi_fprintf(out, arg, "\n"); + } +} + +static void mi_stat_counter_print(const mi_stat_counter_t* stat, const char* msg, mi_output_fun* out, void* arg ) { + _mi_fprintf(out, arg, "%10s:", msg); + mi_print_amount(stat->total, -1, out, arg); + _mi_fprintf(out, arg, "\n"); +} + +static void mi_stat_counter_print_avg(const mi_stat_counter_t* stat, const char* msg, mi_output_fun* out, void* arg) { + const int64_t avg_tens = (stat->count == 0 ? 0 : (stat->total*10 / stat->count)); + const long avg_whole = (long)(avg_tens/10); + const long avg_frac1 = (long)(avg_tens%10); + _mi_fprintf(out, arg, "%10s: %5ld.%ld avg\n", msg, avg_whole, avg_frac1); +} + + +static void mi_print_header(mi_output_fun* out, void* arg ) { + _mi_fprintf(out, arg, "%10s: %10s %10s %10s %10s %10s %10s\n", "heap stats", "peak ", "total ", "freed ", "current ", "unit ", "count "); +} + +#if MI_STAT>1 +static void mi_stats_print_bins(const mi_stat_count_t* bins, size_t max, const char* fmt, mi_output_fun* out, void* arg) { + bool found = false; + char buf[64]; + for (size_t i = 0; i <= max; i++) { + if (bins[i].allocated > 0) { + found = true; + int64_t unit = _mi_bin_size((uint8_t)i); + snprintf(buf, 64, "%s %3lu", fmt, (long)i); + mi_stat_print(&bins[i], buf, unit, out, arg); + } + } + if (found) { + _mi_fprintf(out, arg, "\n"); + mi_print_header(out, arg); + } +} +#endif + + + +//------------------------------------------------------------ +// Use an output wrapper for line-buffered output +// (which is nice when using loggers etc.) +//------------------------------------------------------------ +typedef struct buffered_s { + mi_output_fun* out; // original output function + void* arg; // and state + char* buf; // local buffer of at least size `count+1` + size_t used; // currently used chars `used <= count` + size_t count; // total chars available for output +} buffered_t; + +static void mi_buffered_flush(buffered_t* buf) { + buf->buf[buf->used] = 0; + _mi_fputs(buf->out, buf->arg, NULL, buf->buf); + buf->used = 0; +} + +static void mi_buffered_out(const char* msg, void* arg) { + buffered_t* buf = (buffered_t*)arg; + if (msg==NULL || buf==NULL) return; + for (const char* src = msg; *src != 0; src++) { + char c = *src; + if (buf->used >= buf->count) mi_buffered_flush(buf); + mi_assert_internal(buf->used < buf->count); + buf->buf[buf->used++] = c; + if (c == '\n') mi_buffered_flush(buf); + } +} + +//------------------------------------------------------------ +// Print statistics +//------------------------------------------------------------ + +static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msecs_t* stime, size_t* current_rss, size_t* peak_rss, size_t* current_commit, size_t* peak_commit, size_t* page_faults); + +static void _mi_stats_print(mi_stats_t* stats, mi_output_fun* out0, void* arg0) mi_attr_noexcept { + // wrap the output function to be line buffered + char buf[256]; + buffered_t buffer = { out0, arg0, NULL, 0, 255 }; + buffer.buf = buf; + mi_output_fun* out = &mi_buffered_out; + void* arg = &buffer; + + // and print using that + mi_print_header(out,arg); + #if MI_STAT>1 + mi_stats_print_bins(stats->normal_bins, MI_BIN_HUGE, "normal",out,arg); + #endif + #if MI_STAT + mi_stat_print(&stats->normal, "normal", (stats->normal_count.count == 0 ? 1 : -(stats->normal.allocated / stats->normal_count.count)), out, arg); + mi_stat_print(&stats->large, "large", (stats->large_count.count == 0 ? 1 : -(stats->large.allocated / stats->large_count.count)), out, arg); + mi_stat_print(&stats->huge, "huge", (stats->huge_count.count == 0 ? 1 : -(stats->huge.allocated / stats->huge_count.count)), out, arg); + mi_stat_count_t total = { 0,0,0,0 }; + mi_stat_add(&total, &stats->normal, 1); + mi_stat_add(&total, &stats->large, 1); + mi_stat_add(&total, &stats->huge, 1); + mi_stat_print(&total, "total", 1, out, arg); + #endif + #if MI_STAT>1 + mi_stat_print(&stats->malloc, "malloc req", 1, out, arg); + _mi_fprintf(out, arg, "\n"); + #endif + mi_stat_print(&stats->reserved, "reserved", 1, out, arg); + mi_stat_print(&stats->committed, "committed", 1, out, arg); + mi_stat_print(&stats->reset, "reset", 1, out, arg); + mi_stat_print(&stats->page_committed, "touched", 1, out, arg); + mi_stat_print(&stats->segments, "segments", -1, out, arg); + mi_stat_print(&stats->segments_abandoned, "-abandoned", -1, out, arg); + mi_stat_print(&stats->segments_cache, "-cached", -1, out, arg); + mi_stat_print(&stats->pages, "pages", -1, out, arg); + mi_stat_print(&stats->pages_abandoned, "-abandoned", -1, out, arg); + mi_stat_counter_print(&stats->pages_extended, "-extended", out, arg); + mi_stat_counter_print(&stats->page_no_retire, "-noretire", out, arg); + mi_stat_counter_print(&stats->mmap_calls, "mmaps", out, arg); + mi_stat_counter_print(&stats->commit_calls, "commits", out, arg); + mi_stat_print(&stats->threads, "threads", -1, out, arg); + mi_stat_counter_print_avg(&stats->searches, "searches", out, arg); + _mi_fprintf(out, arg, "%10s: %7zu\n", "numa nodes", _mi_os_numa_node_count()); + + mi_msecs_t elapsed; + mi_msecs_t user_time; + mi_msecs_t sys_time; + size_t current_rss; + size_t peak_rss; + size_t current_commit; + size_t peak_commit; + size_t page_faults; + mi_stat_process_info(&elapsed, &user_time, &sys_time, ¤t_rss, &peak_rss, ¤t_commit, &peak_commit, &page_faults); + _mi_fprintf(out, arg, "%10s: %7ld.%03ld s\n", "elapsed", elapsed/1000, elapsed%1000); + _mi_fprintf(out, arg, "%10s: user: %ld.%03ld s, system: %ld.%03ld s, faults: %lu, rss: ", "process", + user_time/1000, user_time%1000, sys_time/1000, sys_time%1000, (unsigned long)page_faults ); + mi_printf_amount((int64_t)peak_rss, 1, out, arg, "%s"); + if (peak_commit > 0) { + _mi_fprintf(out, arg, ", commit: "); + mi_printf_amount((int64_t)peak_commit, 1, out, arg, "%s"); + } + _mi_fprintf(out, arg, "\n"); +} + +static mi_msecs_t mi_process_start; // = 0 + +static mi_stats_t* mi_stats_get_default(void) { + mi_heap_t* heap = mi_heap_get_default(); + return &heap->tld->stats; +} + +static void mi_stats_merge_from(mi_stats_t* stats) { + if (stats != &_mi_stats_main) { + mi_stats_add(&_mi_stats_main, stats); + memset(stats, 0, sizeof(mi_stats_t)); + } +} + +void mi_stats_reset(void) mi_attr_noexcept { + mi_stats_t* stats = mi_stats_get_default(); + if (stats != &_mi_stats_main) { memset(stats, 0, sizeof(mi_stats_t)); } + memset(&_mi_stats_main, 0, sizeof(mi_stats_t)); + if (mi_process_start == 0) { mi_process_start = _mi_clock_start(); }; +} + +void mi_stats_merge(void) mi_attr_noexcept { + mi_stats_merge_from( mi_stats_get_default() ); +} + +void _mi_stats_done(mi_stats_t* stats) { // called from `mi_thread_done` + mi_stats_merge_from(stats); +} + +void mi_stats_print_out(mi_output_fun* out, void* arg) mi_attr_noexcept { + mi_stats_merge_from(mi_stats_get_default()); + _mi_stats_print(&_mi_stats_main, out, arg); +} + +void mi_stats_print(void* out) mi_attr_noexcept { + // for compatibility there is an `out` parameter (which can be `stdout` or `stderr`) + mi_stats_print_out((mi_output_fun*)out, NULL); +} + +void mi_thread_stats_print_out(mi_output_fun* out, void* arg) mi_attr_noexcept { + _mi_stats_print(mi_stats_get_default(), out, arg); +} + + +// ---------------------------------------------------------------- +// Basic timer for convenience; use milli-seconds to avoid doubles +// ---------------------------------------------------------------- +#ifdef _WIN32 +#include +static mi_msecs_t mi_to_msecs(LARGE_INTEGER t) { + static LARGE_INTEGER mfreq; // = 0 + if (mfreq.QuadPart == 0LL) { + LARGE_INTEGER f; + QueryPerformanceFrequency(&f); + mfreq.QuadPart = f.QuadPart/1000LL; + if (mfreq.QuadPart == 0) mfreq.QuadPart = 1; + } + return (mi_msecs_t)(t.QuadPart / mfreq.QuadPart); +} + +mi_msecs_t _mi_clock_now(void) { + LARGE_INTEGER t; + QueryPerformanceCounter(&t); + return mi_to_msecs(t); +} +#else +#include +#if defined(CLOCK_REALTIME) || defined(CLOCK_MONOTONIC) +mi_msecs_t _mi_clock_now(void) { + struct timespec t; + #ifdef CLOCK_MONOTONIC + clock_gettime(CLOCK_MONOTONIC, &t); + #else + clock_gettime(CLOCK_REALTIME, &t); + #endif + return ((mi_msecs_t)t.tv_sec * 1000) + ((mi_msecs_t)t.tv_nsec / 1000000); +} +#else +// low resolution timer +mi_msecs_t _mi_clock_now(void) { + return ((mi_msecs_t)clock() / ((mi_msecs_t)CLOCKS_PER_SEC / 1000)); +} +#endif +#endif + + +static mi_msecs_t mi_clock_diff; + +mi_msecs_t _mi_clock_start(void) { + if (mi_clock_diff == 0.0) { + mi_msecs_t t0 = _mi_clock_now(); + mi_clock_diff = _mi_clock_now() - t0; + } + return _mi_clock_now(); +} + +mi_msecs_t _mi_clock_end(mi_msecs_t start) { + mi_msecs_t end = _mi_clock_now(); + return (end - start - mi_clock_diff); +} + + +// -------------------------------------------------------- +// Basic process statistics +// -------------------------------------------------------- + +#if defined(_WIN32) +#include +#include +#pragma comment(lib,"psapi.lib") + +static mi_msecs_t filetime_msecs(const FILETIME* ftime) { + ULARGE_INTEGER i; + i.LowPart = ftime->dwLowDateTime; + i.HighPart = ftime->dwHighDateTime; + mi_msecs_t msecs = (i.QuadPart / 10000); // FILETIME is in 100 nano seconds + return msecs; +} + +static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msecs_t* stime, size_t* current_rss, size_t* peak_rss, size_t* current_commit, size_t* peak_commit, size_t* page_faults) +{ + *elapsed = _mi_clock_end(mi_process_start); + FILETIME ct; + FILETIME ut; + FILETIME st; + FILETIME et; + GetProcessTimes(GetCurrentProcess(), &ct, &et, &st, &ut); + *utime = filetime_msecs(&ut); + *stime = filetime_msecs(&st); + PROCESS_MEMORY_COUNTERS info; + GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info)); + *current_rss = (size_t)info.WorkingSetSize; + *peak_rss = (size_t)info.PeakWorkingSetSize; + *current_commit = (size_t)info.PagefileUsage; + *peak_commit = (size_t)info.PeakPagefileUsage; + *page_faults = (size_t)info.PageFaultCount; +} + +#elif !defined(__wasi__) && (defined(__unix__) || defined(__unix) || defined(unix) || defined(__APPLE__) || defined(__HAIKU__)) +#include +#include +#include + +#if defined(__APPLE__) +#include +#endif + +#if defined(__HAIKU__) +#include +#endif + +static mi_msecs_t timeval_secs(const struct timeval* tv) { + return ((mi_msecs_t)tv->tv_sec * 1000L) + ((mi_msecs_t)tv->tv_usec / 1000L); +} + +static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msecs_t* stime, size_t* current_rss, size_t* peak_rss, size_t* current_commit, size_t* peak_commit, size_t* page_faults) +{ + *elapsed = _mi_clock_end(mi_process_start); + struct rusage rusage; + getrusage(RUSAGE_SELF, &rusage); + *utime = timeval_secs(&rusage.ru_utime); + *stime = timeval_secs(&rusage.ru_stime); +#if !defined(__HAIKU__) + *page_faults = rusage.ru_majflt; +#endif + // estimate commit using our stats + *peak_commit = (size_t)(mi_atomic_loadi64_relaxed((_Atomic(int64_t)*)&_mi_stats_main.committed.peak)); + *current_commit = (size_t)(mi_atomic_loadi64_relaxed((_Atomic(int64_t)*)&_mi_stats_main.committed.current)); + *current_rss = *current_commit; // estimate +#if defined(__HAIKU__) + // Haiku does not have (yet?) a way to + // get these stats per process + thread_info tid; + area_info mem; + ssize_t c; + get_thread_info(find_thread(0), &tid); + while (get_next_area_info(tid.team, &c, &mem) == B_OK) { + *peak_rss += mem.ram_size; + } + *page_faults = 0; +#elif defined(__APPLE__) + *peak_rss = rusage.ru_maxrss; // BSD reports in bytes + struct mach_task_basic_info info; + mach_msg_type_number_t infoCount = MACH_TASK_BASIC_INFO_COUNT; + if (task_info(mach_task_self(), MACH_TASK_BASIC_INFO, (task_info_t)&info, &infoCount) == KERN_SUCCESS) { + *current_rss = (size_t)info.resident_size; + } +#else + *peak_rss = rusage.ru_maxrss * 1024; // Linux reports in KiB +#endif +} + +#else +#ifndef __wasi__ +// WebAssembly instances are not processes +#pragma message("define a way to get process info") +#endif + +static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msecs_t* stime, size_t* current_rss, size_t* peak_rss, size_t* current_commit, size_t* peak_commit, size_t* page_faults) +{ + *elapsed = _mi_clock_end(mi_process_start); + *peak_commit = (size_t)(mi_atomic_loadi64_relaxed((_Atomic(int64_t)*)&_mi_stats_main.committed.peak)); + *current_commit = (size_t)(mi_atomic_loadi64_relaxed((_Atomic(int64_t)*)&_mi_stats_main.committed.current)); + *peak_rss = *peak_commit; + *current_rss = *current_commit; + *page_faults = 0; + *utime = 0; + *stime = 0; +} +#endif + + +mi_decl_export void mi_process_info(size_t* elapsed_msecs, size_t* user_msecs, size_t* system_msecs, size_t* current_rss, size_t* peak_rss, size_t* current_commit, size_t* peak_commit, size_t* page_faults) mi_attr_noexcept +{ + mi_msecs_t elapsed = 0; + mi_msecs_t utime = 0; + mi_msecs_t stime = 0; + size_t current_rss0 = 0; + size_t peak_rss0 = 0; + size_t current_commit0 = 0; + size_t peak_commit0 = 0; + size_t page_faults0 = 0; + mi_stat_process_info(&elapsed,&utime, &stime, ¤t_rss0, &peak_rss0, ¤t_commit0, &peak_commit0, &page_faults0); + if (elapsed_msecs!=NULL) *elapsed_msecs = (elapsed < 0 ? 0 : (elapsed < (mi_msecs_t)PTRDIFF_MAX ? (size_t)elapsed : PTRDIFF_MAX)); + if (user_msecs!=NULL) *user_msecs = (utime < 0 ? 0 : (utime < (mi_msecs_t)PTRDIFF_MAX ? (size_t)utime : PTRDIFF_MAX)); + if (system_msecs!=NULL) *system_msecs = (stime < 0 ? 0 : (stime < (mi_msecs_t)PTRDIFF_MAX ? (size_t)stime : PTRDIFF_MAX)); + if (current_rss!=NULL) *current_rss = current_rss0; + if (peak_rss!=NULL) *peak_rss = peak_rss0; + if (current_commit!=NULL) *current_commit = current_commit0; + if (peak_commit!=NULL) *peak_commit = peak_commit0; + if (page_faults!=NULL) *page_faults = page_faults0; +} From 52846aee771405d49ac55153ad9c327c7bd990ff Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Mon, 24 Jun 2019 23:41:27 +0200 Subject: [PATCH 04/10] mimalloc: adjust for building inside Git We want to compile mimalloc's source code as part of Git, rather than requiring the code to be built as an external library: mimalloc uses a CMake-based build, which is not necessarily easy to integrate into the flavors of Git for Windows (which will be the main benefitting port). Signed-off-by: Johannes Schindelin --- compat/mimalloc/alloc.c | 4 ---- compat/mimalloc/mimalloc.h | 3 ++- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/compat/mimalloc/alloc.c b/compat/mimalloc/alloc.c index 70d74cb95790e8..8f084d3ad35170 100644 --- a/compat/mimalloc/alloc.c +++ b/compat/mimalloc/alloc.c @@ -15,10 +15,6 @@ terms of the MIT license. A copy of the license can be found in the file #include // memset, strlen #include // malloc, exit -#define MI_IN_ALLOC_C -#include "alloc-override.c" -#undef MI_IN_ALLOC_C - // ------------------------------------------------------ // Allocation // ------------------------------------------------------ diff --git a/compat/mimalloc/mimalloc.h b/compat/mimalloc/mimalloc.h index 6a6f1b373be1d4..41ccc62d73d182 100644 --- a/compat/mimalloc/mimalloc.h +++ b/compat/mimalloc/mimalloc.h @@ -93,7 +93,8 @@ terms of the MIT license. A copy of the license can be found in the file // Includes // ------------------------------------------------------ -#include // size_t +#include "git-compat-util.h" + #include // bool #ifdef __cplusplus From 4a078fafca6db33047b2df4958f4aa9decf0cc63 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Fri, 12 Aug 2022 13:41:53 +0200 Subject: [PATCH 05/10] mimalloc: avoid `%z` format This format is not supported by MSVC runtimes targeted by the MINGW toolchain. Signed-off-by: Johannes Schindelin --- compat/mimalloc/options.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/compat/mimalloc/options.c b/compat/mimalloc/options.c index 7497e70a7baee2..76aafe62b1062c 100644 --- a/compat/mimalloc/options.c +++ b/compat/mimalloc/options.c @@ -346,7 +346,7 @@ void _mi_fprintf( mi_output_fun* out, void* arg, const char* fmt, ... ) { static void mi_vfprintf_thread(mi_output_fun* out, void* arg, const char* prefix, const char* fmt, va_list args) { if (prefix != NULL && strlen(prefix) <= 32 && !_mi_is_main_thread()) { char tprefix[64]; - snprintf(tprefix, sizeof(tprefix), "%sthread 0x%zx: ", prefix, _mi_thread_id()); + snprintf(tprefix, sizeof(tprefix), "%sthread 0x%llx: ", prefix, (unsigned long long)_mi_thread_id()); mi_vfprintf(out, arg, tprefix, fmt, args); } else { From e56f44a153602cf83da6cea9da0da1fd7e225c25 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Sun, 20 Oct 2019 22:05:35 +0200 Subject: [PATCH 06/10] mimalloc: avoid having to link to `psapi` just for mimalloc Instead, load the `GetProcessMemoryInfo()` function dynamically. When needed. If needed. This is necessary because the start-up cost of Git processes spent on loading dynamic libraries is non-negligible. Signed-off-by: Johannes Schindelin --- compat/mimalloc/stats.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/compat/mimalloc/stats.c b/compat/mimalloc/stats.c index 9ff4485be7decc..c722189f7044e7 100644 --- a/compat/mimalloc/stats.c +++ b/compat/mimalloc/stats.c @@ -459,6 +459,7 @@ mi_msecs_t _mi_clock_end(mi_msecs_t start) { #include #include #pragma comment(lib,"psapi.lib") +#include "compat/win32/lazyload.h" static mi_msecs_t filetime_msecs(const FILETIME* ftime) { ULARGE_INTEGER i; @@ -479,12 +480,17 @@ static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msec *utime = filetime_msecs(&ut); *stime = filetime_msecs(&st); PROCESS_MEMORY_COUNTERS info; - GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info)); - *current_rss = (size_t)info.WorkingSetSize; - *peak_rss = (size_t)info.PeakWorkingSetSize; - *current_commit = (size_t)info.PagefileUsage; - *peak_commit = (size_t)info.PeakPagefileUsage; - *page_faults = (size_t)info.PageFaultCount; + DECLARE_PROC_ADDR(psapi, BOOL, WINAPI, GetProcessMemoryInfo, HANDLE, PPROCESS_MEMORY_COUNTERS, DWORD); + if (INIT_PROC_ADDR(GetProcessMemoryInfo)) { + GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info)); + *current_rss = (size_t)info.WorkingSetSize; + *peak_rss = (size_t)info.PeakWorkingSetSize; + *current_commit = (size_t)info.PagefileUsage; + *peak_commit = (size_t)info.PeakPagefileUsage; + *page_faults = (size_t)info.PageFaultCount; + } else { + *current_rss = *peak_rss = *current_commit = *peak_commit = *page_faults = 0; + } } #elif !defined(__wasi__) && (defined(__unix__) || defined(__unix) || defined(unix) || defined(__APPLE__) || defined(__HAIKU__)) From 59f74e9595d02d89a6532806d53a5872d7d202bf Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Fri, 12 Aug 2022 13:49:22 +0200 Subject: [PATCH 07/10] mimalloc: avoid having to link to `bcrypt` just for mimalloc Instead, load the `BCryptGenRandom()` function dynamically. When needed. If needed. This is necessary because the start-up cost of Git processes spent on loading dynamic libraries is non-negligible. Signed-off-by: Johannes Schindelin --- compat/mimalloc/random.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/compat/mimalloc/random.c b/compat/mimalloc/random.c index 21d052770dc0dd..4e334d3dd76ebd 100644 --- a/compat/mimalloc/random.c +++ b/compat/mimalloc/random.c @@ -185,9 +185,15 @@ static bool os_random_buf(void* buf, size_t buf_len) { return (RtlGenRandom(buf, (ULONG)buf_len) != 0); } #else -#pragma comment (lib,"bcrypt.lib") -#include +#include "compat/win32/lazyload.h" +#ifndef BCRYPT_USE_SYSTEM_PREFERRED_RNG +#define BCRYPT_USE_SYSTEM_PREFERRED_RNG 0x00000002 +#endif + static bool os_random_buf(void* buf, size_t buf_len) { + DECLARE_PROC_ADDR(bcrypt, LONG, NTAPI, BCryptGenRandom, HANDLE, PUCHAR, ULONG, ULONG); + if (!INIT_PROC_ADDR(BCryptGenRandom)) + return 0; return (BCryptGenRandom(NULL, (PUCHAR)buf, (ULONG)buf_len, BCRYPT_USE_SYSTEM_PREFERRED_RNG) >= 0); } #endif From 2075ffd0a6cd14508fa768073b5e675057eb815e Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Mon, 24 Jun 2019 23:43:06 +0200 Subject: [PATCH 08/10] mimalloc: offer a build-time option to enable it By defining `USE_MIMALLOC`, Git can now be compiled with that nicely-fast and small allocator. Note that we have to disable a couple `DEVELOPER` options to build mimalloc's source code, as it makes heavy use of declarations after statements, among other things that disagree with Git's conventions. For example, the `-Wno-array-bounds` flag is needed because in `-O2` builds, trying to call `NtCurrentTeb()` (which `_mi_thread_id()` does on Windows) causes the bogus warning about a system header, likely related to https://sourceforge.net/p/mingw-w64/mailman/message/37674519/ and to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578: C:/git-sdk-64-minimal/mingw64/include/psdk_inc/intrin-impl.h:838:1: error: array subscript 0 is outside array bounds of 'long long unsigned int[0]' [-Werror=array-bounds] 838 | __buildreadseg(__readgsqword, unsigned __int64, "gs", "q") | ^~~~~~~~~~~~~~ Also: The `mimalloc` library uses C11-style atomics, therefore we must require that standard when compiling with GCC if we want to use `mimalloc` (instead of requiring "only" C99). This is what we do in the CMake definition already, therefore this commit does not need to touch `contrib/buildsystems/`. Signed-off-by: Johannes Schindelin --- Makefile | 33 +++++++++++++++++++++++++++++++++ config.mak.dev | 2 ++ config.mak.uname | 2 +- git-compat-util.h | 10 ++++++++++ 4 files changed, 46 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 513d2308b0b5fa..f7a96ec92b431c 100644 --- a/Makefile +++ b/Makefile @@ -1925,6 +1925,39 @@ ifdef USE_NED_ALLOCATOR OVERRIDE_STRDUP = YesPlease endif +ifdef USE_MIMALLOC + MIMALLOC_OBJS = \ + compat/mimalloc/alloc-aligned.o \ + compat/mimalloc/alloc.o \ + compat/mimalloc/arena.o \ + compat/mimalloc/bitmap.o \ + compat/mimalloc/heap.o \ + compat/mimalloc/init.o \ + compat/mimalloc/options.o \ + compat/mimalloc/os.o \ + compat/mimalloc/page.o \ + compat/mimalloc/random.o \ + compat/mimalloc/segment.o \ + compat/mimalloc/segment-cache.o \ + compat/mimalloc/stats.o + + COMPAT_CFLAGS += -Icompat/mimalloc -DMI_DEBUG=0 -DUSE_MIMALLOC --std=gnu11 + COMPAT_OBJS += $(MIMALLOC_OBJS) + +$(MIMALLOC_OBJS): COMPAT_CFLAGS += -DBANNED_H + +ifdef DEVELOPER +$(MIMALLOC_OBJS): COMPAT_CFLAGS += \ + -Wno-attributes \ + -Wno-pedantic \ + -Wno-unknown-pragmas \ + -Wno-declaration-after-statement \ + -Wno-old-style-definition \ + -Wno-missing-prototypes \ + -Wno-array-bounds +endif +endif + ifdef OVERRIDE_STRDUP COMPAT_CFLAGS += -DOVERRIDE_STRDUP COMPAT_OBJS += compat/strdup.o diff --git a/config.mak.dev b/config.mak.dev index 4fa19d361b7837..8e99287376b4e0 100644 --- a/config.mak.dev +++ b/config.mak.dev @@ -22,8 +22,10 @@ endif ifneq ($(uname_S),FreeBSD) ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang7,$(COMPILER_FEATURES))),) +ifndef USE_MIMALLOC DEVELOPER_CFLAGS += -std=gnu99 endif +endif else # FreeBSD cannot limit to C99 because its system headers unconditionally # rely on C11 features. diff --git a/config.mak.uname b/config.mak.uname index 5defc9603384f6..eb181c5b4b3efe 100644 --- a/config.mak.uname +++ b/config.mak.uname @@ -480,7 +480,7 @@ endif CC = compat/vcbuild/scripts/clink.pl AR = compat/vcbuild/scripts/lib.pl CFLAGS = - BASIC_CFLAGS = -nologo -I. -Icompat/vcbuild/include -DWIN32 -D_CONSOLE -DHAVE_STRING_H -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE + BASIC_CFLAGS = -nologo -I. -Icompat/vcbuild/include -DWIN32 -D_CONSOLE -DHAVE_STRING_H -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE -MP -std:c11 COMPAT_OBJS = compat/msvc.o compat/winansi.o \ compat/win32/flush.o \ compat/win32/path-utils.o \ diff --git a/git-compat-util.h b/git-compat-util.h index d78d5e363ed88f..c8d525579d4542 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -365,6 +365,16 @@ char *gitdirname(char *); # include #endif +#ifdef USE_MIMALLOC +#include "mimalloc.h" +#define malloc mi_malloc +#define calloc mi_calloc +#define realloc mi_realloc +#define free mi_free +#define strdup mi_strdup +#define strndup mi_strndup +#endif + /* On most systems would have given us this, but * not on some systems (e.g. z/OS). */ From 53ff12c95e9708be739d200a547d6f946644550b Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Fri, 12 Aug 2022 14:23:36 +0200 Subject: [PATCH 09/10] mimalloc: make MIMALLOC_SHOW_STATS work with redirected `stderr` Setting `MIMALLOC_SHOW_STATS` to ask mimalloc to print out something after the process is done is the easiest way to verify that a mimalloc-enabled Git is running. So it better work and not try to write to a Win32 Console when it got a regular file handle instead or, as is the case in Git for Windows' regular Git Bash window, an emulated pseudo terminal. Signed-off-by: Johannes Schindelin --- compat/mimalloc/options.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/compat/mimalloc/options.c b/compat/mimalloc/options.c index 76aafe62b1062c..3c68bff00d4d16 100644 --- a/compat/mimalloc/options.c +++ b/compat/mimalloc/options.c @@ -179,8 +179,15 @@ static void mi_out_stderr(const char* msg, void* arg) { if (!_mi_preloading()) { // _cputs(msg); // _cputs cannot be used at is aborts if it fails to lock the console static HANDLE hcon = INVALID_HANDLE_VALUE; + static int write_to_console; if (hcon == INVALID_HANDLE_VALUE) { + CONSOLE_SCREEN_BUFFER_INFO sbi; hcon = GetStdHandle(STD_ERROR_HANDLE); + write_to_console = GetConsoleScreenBufferInfo(hcon, &sbi) ? 1 : 0; + } + if (!write_to_console) { + fputs(msg, stderr); + return; } const size_t len = strlen(msg); if (hcon != INVALID_HANDLE_VALUE && len > 0 && len < UINT32_MAX) { From e02f80a06a77d44e9adc4ca442fbfca6015031e1 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Mon, 24 Jun 2019 23:45:21 +0200 Subject: [PATCH 10/10] mingw: use mimalloc Thorough benchmarking with repacking a subset of linux.git (the commit history reachable from 93a6fefe2f ([PATCH] fix the SYSCTL=n compilation, 2007-02-28), to be precise) suggest that this allocator is on par, in multi-threaded situations maybe even better than nedmalloc: `git repack -adfq` with mimalloc, 8 threads: 31.166991900 27.576763800 28.712311000 27.373859000 27.163141900 `git repack -adfq` with nedmalloc, 8 threads: 31.915032900 27.149883100 28.244933700 27.240188800 28.580849500 In a different test using GitHub Actions build agents (probably single-threaded, a core-strength of nedmalloc)): `git repack -q -d -l -A --unpack-unreachable=2.weeks.ago` with mimalloc: 943.426 978.500 939.709 959.811 954.605 `git repack -q -d -l -A --unpack-unreachable=2.weeks.ago` with nedmalloc: 995.383 952.179 943.253 963.043 980.468 While these measurements were not executed with complete scientific rigor, as no hardware was set aside specifically for these benchmarks, it shows that mimalloc and nedmalloc perform almost the same, nedmalloc with a bit higher variance and also slightly higher average (further testing suggests that nedmalloc performs worse in multi-threaded situations than in single-threaded ones). In short: mimalloc seems to be slightly better suited for our purposes than nedmalloc. Seeing that mimalloc is developed actively, while nedmalloc ceased to see any updates in eight years, let's use mimalloc on Windows instead. Signed-off-by: Johannes Schindelin --- config.mak.uname | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/config.mak.uname b/config.mak.uname index eb181c5b4b3efe..c1cadf4ffa576b 100644 --- a/config.mak.uname +++ b/config.mak.uname @@ -656,7 +656,7 @@ ifeq ($(uname_S),MINGW) USE_WIN32_IPC = YesPlease USE_WIN32_MMAP = YesPlease MMAP_PREVENTS_DELETE = UnfortunatelyYes - USE_NED_ALLOCATOR = YesPlease + USE_MIMALLOC = YesPlease UNRELIABLE_FSTAT = UnfortunatelyYes OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo NO_REGEX = YesPlease @@ -724,7 +724,6 @@ else HAVE_LIBCHARSET_H = YesPlease USE_GETTEXT_SCHEME = fallthrough USE_LIBPCRE = YesPlease - USE_NED_ALLOCATOR = YesPlease NO_PYTHON = ifeq (/mingw64,$(subst 32,64,$(prefix))) # Move system config into top-level /etc/