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test_os_linux.cpp
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test_os_linux.cpp
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/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "precompiled.hpp"
#ifdef LINUX
#include <sys/mman.h>
#include "runtime/globals.hpp"
#include "runtime/os.hpp"
#include "utilities/align.hpp"
#include "unittest.hpp"
namespace {
static void small_page_write(void* addr, size_t size) {
size_t page_size = os::vm_page_size();
char* end = (char*)addr + size;
for (char* p = (char*)addr; p < end; p += page_size) {
*p = 1;
}
}
class HugeTlbfsMemory : private ::os::Linux {
char* const _ptr;
const size_t _size;
public:
static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec) {
return os::Linux::reserve_memory_special_huge_tlbfs_only(bytes, req_addr, exec);
}
static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec) {
return os::Linux::reserve_memory_special_huge_tlbfs_mixed(bytes, alignment, req_addr, exec);
}
HugeTlbfsMemory(char* const ptr, size_t size) : _ptr(ptr), _size(size) { }
~HugeTlbfsMemory() {
if (_ptr != NULL) {
os::Linux::release_memory_special_huge_tlbfs(_ptr, _size);
}
}
};
class ShmMemory : private ::os::Linux {
char* const _ptr;
const size_t _size;
public:
static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec) {
return os::Linux::reserve_memory_special_shm(bytes, alignment, req_addr, exec);
}
ShmMemory(char* const ptr, size_t size) : _ptr(ptr), _size(size) { }
~ShmMemory() {
os::Linux::release_memory_special_shm(_ptr, _size);
}
};
// have to use these functions, as gtest's _PRED macros don't like is_aligned
// nor (is_aligned<size_t, size_t>)
static bool is_size_aligned(size_t size, size_t alignment) {
return is_aligned(size, alignment);
}
static bool is_ptr_aligned(char* ptr, size_t alignment) {
return is_aligned(ptr, alignment);
}
static void test_reserve_memory_special_shm(size_t size, size_t alignment) {
ASSERT_TRUE(UseSHM) << "must be used only when UseSHM is true";
char* addr = ShmMemory::reserve_memory_special_shm(size, alignment, NULL, false);
if (addr != NULL) {
ShmMemory mr(addr, size);
EXPECT_PRED2(is_ptr_aligned, addr, alignment);
EXPECT_PRED2(is_ptr_aligned, addr, os::large_page_size());
small_page_write(addr, size);
}
}
}
TEST_VM(os_linux, reserve_memory_special_huge_tlbfs_only) {
if (!UseHugeTLBFS) {
return;
}
size_t lp = os::large_page_size();
for (size_t size = lp; size <= lp * 10; size += lp) {
char* addr = HugeTlbfsMemory::reserve_memory_special_huge_tlbfs_only(size, NULL, false);
if (addr != NULL) {
HugeTlbfsMemory mr(addr, size);
small_page_write(addr, size);
}
}
}
TEST_VM(os_linux, reserve_memory_special_huge_tlbfs_mixed_without_addr) {
if (!UseHugeTLBFS) {
return;
}
size_t lp = os::large_page_size();
size_t ag = os::vm_allocation_granularity();
// sizes to test
const size_t sizes[] = {
lp, lp + ag, lp + lp / 2, lp * 2,
lp * 2 + ag, lp * 2 - ag, lp * 2 + lp / 2,
lp * 10, lp * 10 + lp / 2
};
const int num_sizes = sizeof(sizes) / sizeof(size_t);
for (int i = 0; i < num_sizes; i++) {
const size_t size = sizes[i];
for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) {
char* p = HugeTlbfsMemory::reserve_memory_special_huge_tlbfs_mixed(size, alignment, NULL, false);
if (p != NULL) {
HugeTlbfsMemory mr(p, size);
EXPECT_PRED2(is_ptr_aligned, p, alignment) << " size = " << size;
small_page_write(p, size);
}
}
}
}
TEST_VM(os_linux, reserve_memory_special_huge_tlbfs_mixed_with_good_req_addr) {
if (!UseHugeTLBFS) {
return;
}
size_t lp = os::large_page_size();
size_t ag = os::vm_allocation_granularity();
// sizes to test
const size_t sizes[] = {
lp, lp + ag, lp + lp / 2, lp * 2,
lp * 2 + ag, lp * 2 - ag, lp * 2 + lp / 2,
lp * 10, lp * 10 + lp / 2
};
const int num_sizes = sizeof(sizes) / sizeof(size_t);
// Pre-allocate an area as large as the largest allocation
// and aligned to the largest alignment we will be testing.
const size_t mapping_size = sizes[num_sizes - 1] * 2;
char* const mapping = (char*) ::mmap(NULL, mapping_size,
PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE,
-1, 0);
ASSERT_TRUE(mapping != MAP_FAILED) << " mmap failed, mapping_size = " << mapping_size;
// Unmap the mapping, it will serve as a value for a "good" req_addr
::munmap(mapping, mapping_size);
for (int i = 0; i < num_sizes; i++) {
const size_t size = sizes[i];
for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) {
char* const req_addr = align_up(mapping, alignment);
char* p = HugeTlbfsMemory::reserve_memory_special_huge_tlbfs_mixed(size, alignment, req_addr, false);
if (p != NULL) {
HugeTlbfsMemory mr(p, size);
ASSERT_EQ(req_addr, p) << " size = " << size << ", alignment = " << alignment;
small_page_write(p, size);
}
}
}
}
TEST_VM(os_linux, reserve_memory_special_huge_tlbfs_mixed_with_bad_req_addr) {
if (!UseHugeTLBFS) {
return;
}
size_t lp = os::large_page_size();
size_t ag = os::vm_allocation_granularity();
// sizes to test
const size_t sizes[] = {
lp, lp + ag, lp + lp / 2, lp * 2,
lp * 2 + ag, lp * 2 - ag, lp * 2 + lp / 2,
lp * 10, lp * 10 + lp / 2
};
const int num_sizes = sizeof(sizes) / sizeof(size_t);
// Pre-allocate an area as large as the largest allocation
// and aligned to the largest alignment we will be testing.
const size_t mapping_size = sizes[num_sizes - 1] * 2;
char* const mapping = (char*) ::mmap(NULL, mapping_size,
PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE,
-1, 0);
ASSERT_TRUE(mapping != MAP_FAILED) << " mmap failed, mapping_size = " << mapping_size;
// Leave the mapping intact, it will server as "bad" req_addr
class MappingHolder {
char* const _mapping;
size_t _size;
public:
MappingHolder(char* mapping, size_t size) : _mapping(mapping), _size(size) { }
~MappingHolder() {
::munmap(_mapping, _size);
}
} holder(mapping, mapping_size);
for (int i = 0; i < num_sizes; i++) {
const size_t size = sizes[i];
for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) {
char* const req_addr = align_up(mapping, alignment);
char* p = HugeTlbfsMemory::reserve_memory_special_huge_tlbfs_mixed(size, alignment, req_addr, false);
HugeTlbfsMemory mr(p, size);
// as the area around req_addr contains already existing mappings, the API should always
// return NULL (as per contract, it cannot return another address)
EXPECT_TRUE(p == NULL) << " size = " << size
<< ", alignment = " << alignment
<< ", req_addr = " << req_addr
<< ", p = " << p;
}
}
}
TEST_VM(os_linux, reserve_memory_special_shm) {
if (!UseSHM) {
return;
}
size_t lp = os::large_page_size();
size_t ag = os::vm_allocation_granularity();
for (size_t size = ag; size < lp * 3; size += ag) {
for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) {
EXPECT_NO_FATAL_FAILURE(test_reserve_memory_special_shm(size, alignment));
}
}
}
#endif