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omrvmem.c
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omrvmem.c
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/*******************************************************************************
* Copyright (c) 1991, 2021 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
/**
* @file
* @ingroup Port
* @brief Virtual memory
*/
#include "omrcfg.h"
#include "omrport.h"
#include "omrportpriv.h"
#include "omrportpg.h"
#include "ut_omrport.h"
#include "omrportasserts.h"
#include "omrvmem.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <string.h>
#include <sys/shm.h>
#include <sys/vminfo.h>
#include <unistd.h>
#include <sys/rset.h>
#include <dlfcn.h>
#include <procinfo.h>
#define INVALID_KEY -1
#if 0
#define OMRVMEM_DEBUG
#endif
/* LIR 1394: Search for 64K page support and set it as default if it exists for AIX PPC. */
#define PREFERRED_DEFAULT_PAGE_SIZE SIXTY_FOUR_K
static void *getNextPossibleAddress(uintptr_t alignment, void *currentAddress, intptr_t direction);
static void *getMemoryInRangeForLargePages(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, key_t addressKey, OMRMemCategory *category, uintptr_t byteAmount, void *startAddress, void *endAddress, uintptr_t alignmentInBytes, uintptr_t vmemOptions);
static void *getMemoryInRangeForDefaultPages(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, OMRMemCategory *category, uintptr_t byteAmount, void *startAddress, void *endAddress, uintptr_t alignmentInBytes, uintptr_t vmemOptions, uintptr_t mode);
static void *getMemoryInRangeForDefaultPagesUsingMmap(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, OMRMemCategory *category, uintptr_t byteAmount, void *startAddress, void *endAddress, uintptr_t alignmentInBytes, uintptr_t vmemOptions, uintptr_t mode);
static void *allocateMemoryForLargePages(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, void *currentAddress, key_t addressKey, OMRMemCategory *category, uintptr_t byteAmount);
static void *attemptToReserveInLargePages(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, OMRMemCategory *category, uintptr_t byteAmount, void *startAddress, void *endAddress, uintptr_t pageSize, uintptr_t alignmentInBytes, uintptr_t vmemOptions, uintptr_t mode);
static void *attemptToReserveInDefaultPages(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, OMRMemCategory *category, uintptr_t byteAmount, void *startAddress, void *endAddress, uintptr_t pageSize, uintptr_t alignmentInBytes, uintptr_t vmemOptions, uintptr_t mode);
static void *reserveLargePages(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, OMRMemCategory *category, uintptr_t byteAmount, void *startAddress, void *endAddress, uintptr_t pageSize, uintptr_t alignmentInBytes, uintptr_t vmemOptions, uintptr_t mode);
static BOOLEAN detectAndRecordPageSize(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, key_t addressKey, void *memoryPointer, OMRMemCategory *category, uintptr_t pageSize, uintptr_t byteAmount, uintptr_t vmemOptions, uintptr_t mode);
static uintptr_t getDataSegmentPageSize(struct OMRPortLibrary *portLibrary);
/* This ifdef is specifically provided to allow compilation on AIX 5.3 of features which we can only use on 6.1 */
#if !defined(__ENHANCED_AFFINITY)
#include <sys/systemcfg.h>
#define __ENHANCED_AFFINITY_MASK 0x1000
#define __ENHANCED_AFFINITY() \
(_system_configuration.kernel & __ENHANCED_AFFINITY_MASK)
/* sys/processor.h */
typedef short sradid_t;
/* sys/rset.h */
#define R_SRADSDL R_MCMSDL
#define RS_SRADID_LOADAVG 2
#define R_PROCMEM 14
#define R_SRADID 13
#define R_MIGRATE_ASYNC 0x00000200
typedef struct loadavg_info {
int load_average;
int cpu_count;
} loadavg_info_t;
#if !defined(_AIX61) || defined(J9OS_I5_V6R1)
/* create rsid_t_MODIFIED since rsid_t is already defined in 5.3 but is missing the at_sradid field */
/* at_sradid field missed in IBM i 7.1 */
typedef union {
pid_t at_pid; /* Process id (for R_PROCESS and R_PROCMEM */
tid_t at_tid; /* Kernel thread id (for R_THREAD) */
int at_shmid; /* Shared memory id (for R_SHM) */
int at_fd; /* File descriptor (for R_FILDES) */
rsethandle_t at_rset; /* Resource set handle (for R_RSET) */
subrange_t *at_subrange; /* Memory ranges (for R_SUBRANGE) */
sradid_t at_sradid; /* SRAD id (for R_SRADID) */
#ifdef _KERNEL
ulong_t at_raw_val; /* raw value: used to avoid copy typecasting */
#endif
} rsid_t_MODIFIED;
#endif
extern sradid_t rs_get_homesrad(void);
extern int rs_info(void *out, int command, long arg1, long arg2);
#if !defined(_AIX61) || defined(J9OS_I5_V6R1)
extern int ra_attach(rstype_t, rsid_t, rstype_t, rsid_t_MODIFIED, uint_t);
#else
extern int ra_attach(rstype_t, rsid_t, rstype_t, rsid_t, uint_t);
#endif
/* sys/vminfo.h */
struct vm_srad_meminfo {
int vmsrad_in_size;
int vmsrad_out_size;
size64_t vmsrad_total;
size64_t vmsrad_free;
size64_t vmsrad_file;
int vmsrad_aff_priv_pct;
int vmsrad_aff_avail_pct;
};
#define VM_SRAD_MEMINFO 106
#endif /* !defined(__ENHANCED_AFFINITY) */
void *default_pageSize_reserve_memory(struct OMRPortLibrary *portLibrary, void *address, uintptr_t byteAmount, struct J9PortVmemIdentifier *identifier, uintptr_t mode, uintptr_t pageSize, OMRMemCategory *category);
int get_default_pageSize_protectionBits(uintptr_t mode);
void update_vmemIdentifier(J9PortVmemIdentifier *identifier, void *address, void *handle, uintptr_t byteAmount, uintptr_t mode, uintptr_t pageSize, uintptr_t pageFlags, uintptr_t allocator, OMRMemCategory *category);
static BOOLEAN rangeIsValid(struct J9PortVmemIdentifier *identifier, void *address, uintptr_t byteAmount);
void
omrvmem_shutdown(struct OMRPortLibrary *portLibrary)
{
PPG_numa_platform_supports_numa = 0;
}
int32_t
omrvmem_startup(struct OMRPortLibrary *portLibrary)
{
int num_psizes = 0;
uint64_t physicalMemory = 0;
/* 0 terminate the table */
memset(PPG_vmem_pageSize, 0, OMRPORT_VMEM_PAGESIZE_COUNT * sizeof(uintptr_t));
memset(PPG_vmem_pageFlags, 0, OMRPORT_VMEM_PAGESIZE_COUNT * sizeof(uintptr_t));
/* First the default page size */
PPG_vmem_pageSize[0] = (uintptr_t)getpagesize();
PPG_vmem_pageFlags[0] = OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
#if defined(J9OS_I5) && defined(J9OS_I5_V5R4)
num_psizes = -1; /* vmgetinfo not supported by PASE yet */
#else
/* try the new AIX 5.3E+ interface to get all supported page sizes */
num_psizes = vmgetinfo(NULL, VMINFO_GETPSIZES, 0);
#endif
if (num_psizes == -1) {
/* assume OS does not support VMINFO_GETPSIZES */
/* Now any large page sizes */
if (-1 != sysconf(_SC_LARGE_PAGESIZE)) {
PPG_vmem_pageSize[1] = (uintptr_t)sysconf(_SC_LARGE_PAGESIZE);
PPG_vmem_pageFlags[1] = OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
}
} else {
int counter = 0;
psize_t psizes[OMRPORT_VMEM_PAGESIZE_COUNT];
/* assert(num_psizes < OMRPORT_VMEM_PAGESIZE_COUNT); We don't want to do anything dangerous if this happens as it may, some day.
* We will use the earliest values in the set since they are the ones we should understand (if the OS adds new sizes at the beginning of the list
* there isn't much that we can do
*/
if (num_psizes >= OMRPORT_VMEM_PAGESIZE_COUNT) {
num_psizes = OMRPORT_VMEM_PAGESIZE_COUNT - 1;
}
#if !(defined(J9OS_I5) && defined(J9OS_I5_V5R4))
vmgetinfo(psizes, VMINFO_GETPSIZES, num_psizes);
#endif
physicalMemory = portLibrary->sysinfo_get_physical_memory(portLibrary);
for (counter = 0; counter < num_psizes; counter++) {
if (psizes[counter] > physicalMemory) {
/* Don't advertise pagesizes that exceed the physical memory on the machine. */
Trc_PRT_vmem_omrvmem_startup_pagessize_exceeds_physical_memory(psizes[counter], physicalMemory);
break;
}
PPG_vmem_pageSize[counter] = psizes[counter];
PPG_vmem_pageFlags[counter] = OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
}
}
/* set default value to advise OS about vmem that is no longer needed */
portLibrary->portGlobals->vmemAdviseOSonFree = 1;
/* set default value to advise OS about vmem to consider for Transparent HugePage (Only for Linux) */
portLibrary->portGlobals->vmemEnableMadvise = 0;
return 0;
}
void *
omrvmem_commit_memory(struct OMRPortLibrary *portLibrary, void *address, uintptr_t byteAmount, struct J9PortVmemIdentifier *identifier)
{
void *ptr = NULL;
Trc_PRT_vmem_omrvmem_commit_memory_Entry(address, byteAmount);
if (rangeIsValid(identifier, address, byteAmount)) {
if (0 == (identifier->mode & OMRPORT_VMEM_MEMORY_MODE_EXECUTE)) {
/* Assert that address and byteAmount are page aligned. These restrictions are not required for executable pages
* because when using default page size they are allocated using malloc()
* which may not return page aligned address and any attempt to align it to page boundary would waste one page of memory.
*/
ASSERT_VALUE_IS_PAGE_SIZE_ALIGNED(address, identifier->pageSize);
ASSERT_VALUE_IS_PAGE_SIZE_ALIGNED(byteAmount, identifier->pageSize);
}
if (PPG_vmem_pageSize[0] == identifier->pageSize) {
if (0 == mprotect(address, byteAmount, get_default_pageSize_protectionBits(identifier->mode))) {
ptr = address;
} else {
ptr = NULL;
}
} else {
ptr = address;
}
} else {
Trc_PRT_vmem_omrvmem_commit_memory_invalidRange(identifier->address, identifier->size, address, byteAmount);
portLibrary->error_set_last_error(portLibrary, -1, OMRPORT_ERROR_VMEM_INVALID_PARAMS);
}
Trc_PRT_vmem_omrvmem_commit_memory_Exit(ptr);
return ptr;
/* return memset(address, 0, byteAmount); */
/*
* CMVC 70354 change
* DANGER: memory is already zeroed when it gets faulted in so no memset is required.
* However, if the memory cannot actually be faulted in when needed, the VM will crash
* during execution in a much less obvious way. Adding a VM flag to force the init is
* a RAS TODO.
*/
}
intptr_t
omrvmem_decommit_memory(struct OMRPortLibrary *portLibrary, void *address, uintptr_t byteAmount, struct J9PortVmemIdentifier *identifier)
{
intptr_t result = -1;
Trc_PRT_vmem_omrvmem_decommit_memory_Entry(address, byteAmount);
if (portLibrary->portGlobals->vmemAdviseOSonFree == 1) {
if (rangeIsValid(identifier, address, byteAmount)) {
ASSERT_VALUE_IS_PAGE_SIZE_ALIGNED(address, identifier->pageSize);
ASSERT_VALUE_IS_PAGE_SIZE_ALIGNED(byteAmount, identifier->pageSize);
if (byteAmount > 0) {
if ((OMRPORT_VMEM_RESERVE_USED_J9MEM_ALLOCATE_MEMORY == identifier->allocator) || (OMRPORT_VMEM_RESERVE_USED_SHM == identifier->allocator)) {
if ((FOUR_K == identifier->pageSize) || (SIXTY_FOUR_K == identifier->pageSize)) {
unsigned long flags = DISCLAIM_ZEROMEM;
Trc_PRT_vmem_decommit_memory_calling_disclaim(flags);
result = (intptr_t)disclaim64((void *)address, (size_t) byteAmount, flags);
} else {
/* noop: both 16M and 16G pages are pinned in memory so don't disclaim them */
result = 0;
}
} else if (identifier->allocator == OMRPORT_VMEM_RESERVE_USED_MMAP) {
int flags = MS_INVALIDATE;
Trc_PRT_vmem_decommit_memory_calling_msync(flags);
result = (intptr_t)msync((void *)address, (size_t) byteAmount, flags);
} else {
/* should not get here */
Trc_PRT_Assert_ShouldNeverHappen();
}
if (0 != result) {
Trc_PRT_vmem_omrvmem_decommit_memory_failure(errno, address, byteAmount);
}
} else {
/* nothing to de-commit. */
Trc_PRT_vmem_decommit_memory_zero_pages();
result = 0;
}
} else {
result = -1;
Trc_PRT_vmem_omrvmem_decommit_memory_invalidRange(identifier->address, identifier->size, address, byteAmount);
portLibrary->error_set_last_error(portLibrary, result, OMRPORT_ERROR_VMEM_INVALID_PARAMS);
}
} else {
if (!rangeIsValid(identifier, address, byteAmount)) {
result = -1;
Trc_PRT_vmem_omrvmem_decommit_memory_invalidRange(identifier->address, identifier->size, address, byteAmount);
portLibrary->error_set_last_error(portLibrary, result, OMRPORT_ERROR_VMEM_INVALID_PARAMS);
} else {
ASSERT_VALUE_IS_PAGE_SIZE_ALIGNED(address, identifier->pageSize);
ASSERT_VALUE_IS_PAGE_SIZE_ALIGNED(byteAmount, identifier->pageSize);
/* JVM is not allowed to decommit, just return success */
Trc_PRT_vmem_decommit_memory_not_allowed(portLibrary->portGlobals->vmemAdviseOSonFree);
result = 0;
}
}
Trc_PRT_vmem_omrvmem_decommit_memory_Exit(result);
return (intptr_t)result;
}
int32_t
omrvmem_free_memory(struct OMRPortLibrary *portLibrary, void *userAddress, uintptr_t byteAmount, struct J9PortVmemIdentifier *identifier)
{
int32_t result = 0;
Trc_PRT_vmem_omrvmem_free_memory_Entry(userAddress, byteAmount);
void *address = identifier->address;
uintptr_t allocator = identifier->allocator;
uintptr_t size = identifier->size;
OMRMemCategory *category = identifier->category;
update_vmemIdentifier(identifier, NULL, NULL, 0, 0, 0, 0, 0, NULL);
if (OMRPORT_VMEM_RESERVE_USED_J9MEM_ALLOCATE_MEMORY == allocator) {
portLibrary->mem_free_memory(portLibrary, address);
/* omrmem_categories_decrement_counters will be done by mem_free_memory */
} else if (OMRPORT_VMEM_RESERVE_USED_MMAP == allocator) {
result = (int32_t)munmap(address, byteAmount);
omrmem_categories_decrement_counters(category, size);
} else if (OMRPORT_VMEM_RESERVE_USED_SHM == allocator) {
result = (int32_t)shmdt(address);
omrmem_categories_decrement_counters(category, size);
} else {
result = (int32_t)OMRPORT_ERROR_VMEM_INVALID_PARAMS;
}
Trc_PRT_vmem_omrvmem_free_memory_Exit(result);
return result;
}
int32_t
omrvmem_vmem_params_init(struct OMRPortLibrary *portLibrary, struct J9PortVmemParams *params)
{
memset(params, 0, sizeof(struct J9PortVmemParams));
params->startAddress = NULL;
params->endAddress = OMRPORT_VMEM_MAX_ADDRESS;
params->byteAmount = 0;
params->pageSize = PPG_vmem_pageSize[0];
params->pageFlags = PPG_vmem_pageFlags[0];
params->mode = OMRPORT_VMEM_MEMORY_MODE_READ | OMRPORT_VMEM_MEMORY_MODE_WRITE;
params->options = 0;
params->category = OMRMEM_CATEGORY_UNKNOWN;
params->alignmentInBytes = 0;
return 0;
}
void *
omrvmem_reserve_memory(struct OMRPortLibrary *portLibrary, void *address, uintptr_t byteAmount, struct J9PortVmemIdentifier *identifier, uintptr_t mode, uintptr_t pageSize, uint32_t category)
{
struct J9PortVmemParams params;
omrvmem_vmem_params_init(portLibrary, ¶ms);
if (NULL != address) {
params.startAddress = address;
params.endAddress = address;
}
params.byteAmount = byteAmount;
params.mode = mode;
params.pageSize = pageSize;
params.pageFlags = OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
params.options = 0;
params.category = category;
return portLibrary->vmem_reserve_memory_ex(portLibrary, identifier, ¶ms);
}
void *
omrvmem_reserve_memory_ex(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, struct J9PortVmemParams *params)
{
/* Under AIX 5.2, a 32-bit process can request up to 3.25 GB with each shmget call (essentially all of the available memory), and
* a 64-bit process can request at least 1 TB. We will consider 1 TB to be an acceptable restriction, and not resort to the additional
* complexity of multiple shmget calls.
*/
int pageSizeCheckIndex = 0;
void *memoryPointer = NULL;
/* this use of "localParams" is only in place until we implement native reserve alignment (this is just the implementation we use in callers) */
OMRMemCategory *category = omrmem_get_category(portLibrary, params->category);
Trc_PRT_vmem_omrvmem_reserve_memory_Entry_replacement(params->startAddress, params->byteAmount, params->pageSize);
#if defined(OMRVMEM_DEBUG)
printf("\n\tomrvmem_reserve_memory_ex byteAmount: %p, startAddress: %p, endAddress: %p, pageSize: 0x%zX, %s, %s, %s\n ",
params->byteAmount, params->startAddress, params->endAddress, params->pageSize,
(OMRPORT_VMEM_STRICT_PAGE_SIZE & params->options) ? "OMRPORT_VMEM_STRICT_PAGE_SIZE" : "\t",
(OMRPORT_VMEM_STRICT_ADDRESS & params->options) ? "OMRPORT_VMEM_STRICT_ADDRESS" : "\t",
(OMRPORT_VMEM_MEMORY_MODE_EXECUTE & params->mode) ? "OMRPORT_VMEM_MEMORY_MODE_EXECUTE" : "\t");
#endif
Assert_PRT_true(params->startAddress <= params->endAddress);
ASSERT_VALUE_IS_PAGE_SIZE_ALIGNED(params->byteAmount, params->pageSize);
if (0 == params->pageSize) {
/* Invalid input */
update_vmemIdentifier(identifier, NULL, NULL, 0, 0, 0, 0, 0, NULL);
Trc_PRT_vmem_omrvmem_reserve_memory_invalid_input();
} else if (PPG_vmem_pageSize[0] == params->pageSize) {
/* Handle default page size differently, don't use shmget */
uintptr_t alignment = OMR_MAX(params->pageSize, params->alignmentInBytes);
uintptr_t minimumGranule = OMR_MIN(params->pageSize, params->alignmentInBytes);
/* Make sure that the alignment is a multiple of both requested alignment and page size (enforces that arguments are powers of two and, thus, their max is their lowest common multiple) */
if ((0 == minimumGranule) || (0 == (alignment % minimumGranule))) {
memoryPointer = getMemoryInRangeForDefaultPages(portLibrary, identifier, category, params->byteAmount, params->startAddress, params->endAddress, alignment, params->options, params->mode);
}
} else {
BOOLEAN requestedPageSizeIsSupported = FALSE;
BOOLEAN preferedDefaultPageSizeIsSupported = FALSE;
BOOLEAN preferedDefaultPageSizeIsRequested = (PREFERRED_DEFAULT_PAGE_SIZE == params->pageSize);
/* If we were not called with the default page size, we must ensure that we were called with one of our understood sizes.
* AIX offers a total of 4 page sizes:
* 4 kB (default)
* 64 kB (5.3E or later on POWER5+)
* 16 MB (legacy large page)
* 16 GB (very large page in 5.3E or later on POWER5+)
*/
/* make sure that this is valid page size for this configuration
* check that PREFERRED_DEFAULT_PAGE_SIZE is in list as well - it will be used if original requested allocation is not succeed
*/
while (0 != PPG_vmem_pageSize[pageSizeCheckIndex]) {
if (params->pageSize == PPG_vmem_pageSize[pageSizeCheckIndex]) {
/* this is requested page size - found */
requestedPageSizeIsSupported = TRUE;
}
if (PREFERRED_DEFAULT_PAGE_SIZE == PPG_vmem_pageSize[pageSizeCheckIndex]) {
/* this is default prefered page size - found */
preferedDefaultPageSizeIsSupported = TRUE;
}
if (requestedPageSizeIsSupported && preferedDefaultPageSizeIsSupported) {
/* both found - no reason to continue */
break;
}
pageSizeCheckIndex++;
}
if (requestedPageSizeIsSupported) {
/* try to allocate in requested pages first */
memoryPointer = attemptToReserveInLargePages(portLibrary, identifier, category, params->byteAmount, params->startAddress, params->endAddress,
params->pageSize, params->alignmentInBytes, params->options | OMRPORT_VMEM_STRICT_PAGE_SIZE, params->mode);
if ((NULL == memoryPointer) && (0 == (OMRPORT_VMEM_STRICT_PAGE_SIZE & params->options))) {
if (preferedDefaultPageSizeIsSupported && !preferedDefaultPageSizeIsRequested) {
/*
* If requested page is not supported or memory can not be allocated with such page size
* repeat an allocation with PREFERRED_DEFAULT_PAGE_SIZE
*/
memoryPointer = attemptToReserveInLargePages(portLibrary, identifier, category, params->byteAmount, params->startAddress, params->endAddress,
PREFERRED_DEFAULT_PAGE_SIZE, params->alignmentInBytes, params->options | OMRPORT_VMEM_STRICT_PAGE_SIZE, params->mode);
}
if (NULL == memoryPointer) {
/* use shmat allocation type for default page size */
memoryPointer = attemptToReserveInLargePages(portLibrary, identifier, category, params->byteAmount, params->startAddress, params->endAddress,
PPG_vmem_pageSize[0], params->alignmentInBytes, params->options, params->mode);
}
if (NULL == memoryPointer) {
/*
* Try again with default size pages using another allocation methods
* Do it only if known page size allocation was requested - for compatibility with old code
*/
#if defined(OMRVMEM_DEBUG)
printf("\t\t\t NULL == memoryPointer, reverting to default pages\n");
fflush(stdout);
#endif
memoryPointer = attemptToReserveInDefaultPages(portLibrary, identifier, category, params->byteAmount, params->startAddress, params->endAddress,
PPG_vmem_pageSize[0], params->alignmentInBytes, params->options, params->mode);
}
}
}
if (NULL == memoryPointer) {
/* we failed to find the page size before hitting the null terminator so use the unsupported page size trace point and fail */
update_vmemIdentifier(identifier, NULL, NULL, 0, 0, 0, 0, 0, NULL);
if (!requestedPageSizeIsSupported) {
Trc_PRT_vmem_omrvmem_reserve_memory_unsupported_page_size(params->pageSize);
}
}
}
#if defined(OMRVMEM_DEBUG)
printf("\t\t omrvmem_reserve_memory_ex returning address: %p\n", memoryPointer);
#endif
Trc_PRT_vmem_omrvmem_reserve_memory_Exit_replacement(memoryPointer, params->startAddress);
return memoryPointer;
}
static void *
attemptToReserveInLargePages(struct OMRPortLibrary *portLibrary,
struct J9PortVmemIdentifier *identifier,
OMRMemCategory *category,
uintptr_t byteAmount,
void *startAddress,
void *endAddress,
uintptr_t pageSize,
uintptr_t alignmentInBytes,
uintptr_t vmemOptions,
uintptr_t mode)
{
void *memoryPointer = NULL;
/* large pages so we have to use the shm API */
uintptr_t alignment = OMR_MAX(pageSize, alignmentInBytes);
uintptr_t minimumGranule = OMR_MIN(pageSize, alignmentInBytes);
/* Make sure that the alignment is a multiple of both requested alignment and page size (enforces that arguments are powers of two and, thus, their max is their lowest common multiple) */
if ((0 == minimumGranule) || (0 == (alignment % minimumGranule))) {
memoryPointer = reserveLargePages(portLibrary, identifier, category, byteAmount, startAddress, endAddress, pageSize, alignment, vmemOptions, mode);
}
return memoryPointer;
}
static void *
attemptToReserveInDefaultPages(struct OMRPortLibrary *portLibrary,
struct J9PortVmemIdentifier *identifier,
OMRMemCategory *category,
uintptr_t byteAmount,
void *startAddress,
void *endAddress,
uintptr_t pageSize,
uintptr_t alignmentInBytes,
uintptr_t vmemOptions,
uintptr_t mode)
{
void *memoryPointer = NULL;
uintptr_t alignment = OMR_MAX(pageSize, alignmentInBytes);
uintptr_t minimumGranule = OMR_MIN(pageSize, alignmentInBytes);
/* Make sure that the alignment is a multiple of both requested alignment and page size (enforces that arguments are powers of two and, thus, their max is their lowest common multiple) */
if ((0 == minimumGranule) || (0 == (alignment % minimumGranule))) {
memoryPointer = getMemoryInRangeForDefaultPages(portLibrary, identifier, category, byteAmount, startAddress, endAddress, alignment, vmemOptions, mode);
}
return memoryPointer;
}
static void *
reserveLargePages(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, OMRMemCategory *category, uintptr_t byteAmount, void *startAddress, void *endAddress, uintptr_t pageSize, uintptr_t alignmentInBytes, uintptr_t vmemOptions, uintptr_t mode)
{
void *memoryPointer = NULL;
key_t addressKey;
int shmgetFlags = IPC_CREAT;
/* Determine shmget flags */
/* by this point, we know that we want to use large pages */
/* set the access permissions */
if (0 != (OMRPORT_VMEM_MEMORY_MODE_READ & mode)) {
shmgetFlags |= S_IRUSR;
}
if (0 != (OMRPORT_VMEM_MEMORY_MODE_WRITE & mode)) {
shmgetFlags |= S_IWUSR;
}
if (0 != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) {
shmgetFlags |= S_IXUSR;
}
/* Reserve and attach memory */
addressKey = shmget(IPC_PRIVATE, (size_t)byteAmount, shmgetFlags);
#if defined(OMRVMEM_DEBUG)
printf("\t\t omrvmem_reserve_memory_ex shmget(byteAmount 0x%zX, shmgetFlags = 0x%x) returning addressKey: 0x%zx\n", byteAmount, shmgetFlags, addressKey);
#endif
if (-1 == addressKey) {
Trc_PRT_vmem_omrvmem_reserve_memory_shmget_failed(byteAmount, shmgetFlags);
} else {
struct shmid_ds mutate;
memset(&mutate, 0x0, sizeof(struct shmid_ds));
mutate.shm_pagesize = pageSize;
if (-1 == shmctl(addressKey, SHM_PAGESIZE, (struct shmid_ds *)&mutate)) {
/* Failed to set page size, this will happen if the env var EXTSHM=ON is set
* It is safe to continue with the memory request.
* detectAndRecordPageSize() (below) will determine if the page size we get is acceptable */
#if defined(OMRVMEM_DEBUG)
printf("\t\t shmctl() failed\n");
#endif
}
memoryPointer = getMemoryInRangeForLargePages(portLibrary, identifier, addressKey, category, byteAmount, startAddress, endAddress, alignmentInBytes, vmemOptions);
/* release when complete, protect from ^C or crash */
if (0 == shmctl(addressKey, IPC_RMID, NULL)) {
if (NULL != memoryPointer) {
/* Detect and record the page size in the vmemIdentifier */
if (FALSE == detectAndRecordPageSize(portLibrary, identifier, addressKey, memoryPointer, category, pageSize, byteAmount, vmemOptions, mode)) {
omrvmem_free_memory(portLibrary, memoryPointer, byteAmount, identifier);
memoryPointer = NULL;
} else {
if (0 != (OMRPORT_VMEM_MEMORY_MODE_COMMIT & mode)) {
if (NULL == omrvmem_commit_memory(portLibrary, memoryPointer, byteAmount, identifier)) {
/* If the commit fails free the memory */
omrvmem_free_memory(portLibrary, memoryPointer, byteAmount, identifier);
memoryPointer = NULL;
}
}
}
}
} else {
/* if releasing addressKey fails detach memory to avoid leaks and fail */
if (NULL != memoryPointer) {
if (0 != shmdt(memoryPointer)) {
Trc_PRT_vmem_omrvmem_reserve_memory_shmdt_failed(memoryPointer);
}
}
Trc_PRT_vmem_omrvmem_reserve_memory_failure();
memoryPointer = NULL;
}
}
if (NULL == memoryPointer) {
update_vmemIdentifier(identifier, NULL, NULL, 0, 0, 0, 0, 0, NULL);
}
Trc_PRT_vmem_omrvmem_reserve_memory_Exit_replacement(memoryPointer, startAddress);
#if defined(OMRVMEM_DEBUG)
printf("\t\t reserveLargePages returning address: 0x%zX\n", memoryPointer);
#endif
return memoryPointer;
}
/**
* Detects the page size of the memory pointed to by memoryPointer
* and records it in the identifier.
* @return TRUE upon success, FALSE if an error occurs or if the detected
* page size is different from the requested page size and
* OMRPORT_VMEM_STRICT_PAGE_SIZE is set
*/
static BOOLEAN
detectAndRecordPageSize(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier, key_t addressKey, void *memoryPointer, OMRMemCategory *category, uintptr_t pageSize, uintptr_t byteAmount, uintptr_t vmemOptions, uintptr_t mode)
{
struct vm_page_info page_info;
int vmgetinfoResult;
BOOLEAN vmgetinfoFailedFirstTime = FALSE;
#if !(defined(J9OS_I5) && defined(J9OS_I5_V5R4))
/* Ensure we got back the correct page size if OMRPORT_VMEM_STRICT_PAGE_SIZE is set */
page_info.addr = (uint64_t) memoryPointer;
vmgetinfoResult = vmgetinfo(&page_info, VM_PAGE_INFO, sizeof(struct vm_page_info));
if (0 != vmgetinfoResult) {
vmgetinfoFailedFirstTime = TRUE;
page_info.addr = ((uint64_t) memoryPointer) + byteAmount - 1;
/* TODO: Find out why original author of code thought that vmgetinfo
* may sometimes fail
*/
vmgetinfoResult = vmgetinfo(&page_info, VM_PAGE_INFO, sizeof(struct vm_page_info));
}
/* Update identifier and commit memory if required, else return reserved memory */
update_vmemIdentifier(identifier, memoryPointer, (void *)(intptr_t)addressKey, byteAmount, mode, (uintptr_t)page_info.pagesize, OMRPORT_VMEM_PAGE_FLAG_NOT_USED, OMRPORT_VMEM_RESERVE_USED_SHM, category);
if (0 != vmgetinfoResult) {
Trc_PRT_vmem_omrvmem_reserve_memory_ex_aix_vmgetinfo_failed(page_info.addr);
return FALSE;
} else if (page_info.pagesize != pageSize) {
/* if we got here then one of the calls to vmgetinfo succeeded */
#if defined(OMRVMEM_DEBUG)
if (!vmgetinfoFailedFirstTime) {
portLibrary->tty_printf(portLibrary, "Warning: large pages not available\n");
} else {
portLibrary->tty_printf(portLibrary, "Warning: not enough large pages to satisfy entire allocation\n");
}
#endif
if (0 != (OMRPORT_VMEM_STRICT_PAGE_SIZE & vmemOptions)) {
return FALSE;
}
}
#else
/* Update identifier and commit memory if required, else return reserved memory */
update_vmemIdentifier(identifier, memoryPointer, (void *)addressKey, byteAmount, mode, pageSize, OMRPORT_VMEM_PAGE_FLAG_NOT_USED, OMRPORT_VMEM_RESERVE_USED_SHM, category);
#endif /* !(defined(J9OS_I5) && defined(J9OS_I5_V5R4)) */
return TRUE;
}
uintptr_t
omrvmem_get_page_size(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier)
{
return identifier->pageSize;
}
uintptr_t
omrvmem_get_page_flags(struct OMRPortLibrary *portLibrary, struct J9PortVmemIdentifier *identifier)
{
return identifier->pageFlags;
}
uintptr_t *
omrvmem_supported_page_sizes(struct OMRPortLibrary *portLibrary)
{
return PPG_vmem_pageSize;
}
uintptr_t *
omrvmem_supported_page_flags(struct OMRPortLibrary *portLibrary)
{
return PPG_vmem_pageFlags;
}
/**
* @internal
* Update J9PortVmIdentifier structure
*
* @param[in] identifier The structure to be updated
* @param[in] address Base address
* @param[in] handle Platform specific handle for reserved memory
* @param[in] byteAmount Size of allocated area
* @param[in] mode Access Mode
* @param[in] pageSize Constant describing pageSize
* @param[in] allocator Constant describing how the virtual memory was allocated.
* @param[in] category Pointer to memory category
*/
void update_vmemIdentifier(J9PortVmemIdentifier *identifier, void *address, void *handle, uintptr_t byteAmount, uintptr_t mode, uintptr_t pageSize, uintptr_t pageFlags, uintptr_t allocator, OMRMemCategory *category)
{
identifier->address = address;
identifier->handle = handle;
identifier->size = byteAmount;
identifier->pageSize = pageSize;
identifier->pageFlags = pageFlags;
identifier->mode = mode;
identifier->allocator = allocator;
identifier->category = category;
}
/**
* @internal
* @see omrvmem_reserve_memory
*
* @param[in] portLibrary The port library.
* @param[in] address The starting address of the memory to be reserved.
* @param[in] byteAmount The number of bytes to be reserved.
* @param[in] identifier Descriptor for virtual memory block.
* @param[in] mode Bitmap indicating how memory is to be reserved. Expected values combination of:
* @param[in] category Memory category
*
* @return pointer to the reserved memory on success, NULL on failure.
*
* @internal @warning Do not call error handling code @ref omrerror upon error as
* the error handling code uses per thread buffers to store the last error. If memory
* can not be allocated the result would be an infinite loop.
*/
void *
default_pageSize_reserve_memory(struct OMRPortLibrary *portLibrary, void *address, uintptr_t byteAmount, struct J9PortVmemIdentifier *identifier, uintptr_t mode, uintptr_t pageSize, OMRMemCategory *category)
{
int fd = -1;
int flags = MAP_SHARED;
int protMask;
void *result = NULL;
if(mode & OMRPORT_VMEM_MEMORY_MODE_SHARE_FILE_OPEN) {
portLibrary->error_set_last_error(portLibrary, errno, OMRPORT_ERROR_VMEM_NOT_SUPPORTED);
return result;
}
Trc_PRT_vmem_default_reserve_entry(address, byteAmount);
if (0 != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) {
/* Allocate code memory */
result = portLibrary->mem_allocate_memory(portLibrary, byteAmount, OMR_GET_CALLSITE(), category->categoryCode);
#if defined(OMRVMEM_DEBUG)
printf("\t\t mem_allocate_memory(byteAmount = 0x%zx) returned 0x%zx \n", byteAmount, result);
#endif
if (NULL == result) {
Trc_PRT_vmem_default_reserve_failed(address, byteAmount);
update_vmemIdentifier(identifier, NULL, NULL, 0, 0, 0, 0, 0, NULL);
Trc_PRT_vmem_default_reserve_exit(result, address, byteAmount);
return NULL;
}
/* mem_allocate_memory will have called omrmem_category_increment_counters() - we don't need to do so */
update_vmemIdentifier(identifier, result, result, byteAmount, mode, pageSize, OMRPORT_VMEM_PAGE_FLAG_NOT_USED, OMRPORT_VMEM_RESERVE_USED_J9MEM_ALLOCATE_MEMORY, category);
Trc_PRT_vmem_default_reserve_exit(result, address, byteAmount);
return result;
}
#if defined(MAP_ANONYMOUS)
flags |= MAP_ANONYMOUS;
#else
fd = portLibrary->file_open(portLibrary, "/dev/zero", EsOpenRead | EsOpenWrite, 0);
if (-1 != fd)
#endif
{
/* Attributes requested */
protMask = get_default_pageSize_protectionBits(mode);
if (address != NULL) {
flags |= MAP_FIXED;
}
/* mmap and protect the memory */
result = mmap(address, (size_t)byteAmount, protMask, flags, fd, 0);
#if defined(OMRVMEM_DEBUG)
printf("\t\t mmap(address = 0x%xz, byteAmount = 0x%zx) returned 0x%zx \n", address, byteAmount, result);
#endif
#if !defined(MAP_ANONYMOUS)
portLibrary->file_close(portLibrary, fd);
#endif
if (MAP_FAILED == result) {
result = NULL;
} else {
omrmem_categories_increment_counters(category, byteAmount);
update_vmemIdentifier(identifier, result, result, byteAmount, mode, pageSize, OMRPORT_VMEM_PAGE_FLAG_NOT_USED, OMRPORT_VMEM_RESERVE_USED_MMAP, category);
if (0 != (OMRPORT_VMEM_MEMORY_MODE_COMMIT & mode)) {
if (NULL == omrvmem_commit_memory(portLibrary, result, byteAmount, identifier)) {
/* If the commit fails free the memory */
omrvmem_free_memory(portLibrary, result, byteAmount, identifier);
result = NULL;
}
}
}
}
if (NULL == result) {
Trc_PRT_vmem_default_reserve_failed(address, byteAmount);
update_vmemIdentifier(identifier, NULL, NULL, 0, 0, 0, 0, 0, NULL);
}
Trc_PRT_vmem_default_reserve_exit(result, address, byteAmount);
return result;
}
/**
* Get protection bits when reserving memory with the default page size
*
* @param[in] mode Bitmap indicating how memory is to be reserved. Expected values combination of:
* \arg OMRPORT_VMEM_MEMORY_MODE_READ memory is readable
* \arg OMRPORT_VMEM_MEMORY_MODE_WRITE memory is writable
* \arg OMRPORT_VMEM_MEMORY_MODE_EXECUTE memory is executable
* \arg OMRPORT_VMEM_MEMORY_MODE_COMMIT commits memory as part of the reserve
*
* @return the protection flags required by the functions used to reserve memory for default page size
*/
int
get_default_pageSize_protectionBits(uintptr_t mode)
{
int protectionFlags = 0;
if (0 != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) {
protectionFlags |= PROT_EXEC;
}
if (0 != (OMRPORT_VMEM_MEMORY_MODE_READ & mode)) {
protectionFlags |= PROT_READ;
}
if (0 != (OMRPORT_VMEM_MEMORY_MODE_WRITE & mode)) {
protectionFlags |= PROT_WRITE;
}
if (0 == protectionFlags) {
protectionFlags = PROT_NONE;
}
return protectionFlags;
}
/**
* Helper routine to get page size of data segment.
* To get data segment page size, retrieve size of the page backing portLibrary->portGlobals
* which is allocated using omrmem_allocate_memory() in port/unix/omrmem.c
*
* @param[in] portLibrary The port library.
*
* @return page size of data segment.
*/
static uintptr_t
getDataSegmentPageSize(struct OMRPortLibrary *portLibrary)
{
intptr_t rc = -1;
uintptr_t pageSize = 0;
struct vm_page_info pageInfo;
pageInfo.addr = (uint64_t) portLibrary->portGlobals;
rc = vmgetinfo(&pageInfo, VM_PAGE_INFO, sizeof(struct vm_page_info));
if (0 == rc) {
pageSize = pageInfo.pagesize;
} else {
/* vmgetinfo() can fail with VM_PAGE_INFO only if vm_page_info.addr is invalid,
* which should never happen here as portLibrary->portGlobals is valid until VM shutdown.
*/
Assert_PRT_ShouldNeverHappen_wrapper();
}
return pageSize;
}
void
omrvmem_default_large_page_size_ex(struct OMRPortLibrary *portLibrary, uintptr_t mode, uintptr_t *pageSize, uintptr_t *pageFlags)
{
if (NULL != pageSize) {
if (OMRPORT_VMEM_MEMORY_MODE_EXECUTE != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) {
/* AIX 5.3E (or later) on POWER5+ supports 4 kiB, 64 kiB, 16 MiB, 16 GiB page sizes (in that order).
* To be compatible with how the -Xlp option has historically worked, 16 MiB is the default page size.
* If, for some reason, that page size can't be found, we search for 64KB page size.
* If that is also not found, we will return the page size at [1] since failing is
* probably not a reasonable answer as it would break our support for that legacy option (and that
* situation should never occur).
*/
uintptr_t preferredPageSize = PPG_vmem_pageSize[1];
uint32_t index = 0;
while (0 != PPG_vmem_pageSize[index]) {
if (SIXTEEN_M == PPG_vmem_pageSize[index]) {
preferredPageSize = SIXTEEN_M;
break;
}
if (SIXTY_FOUR_K == PPG_vmem_pageSize[index]) {
preferredPageSize = SIXTY_FOUR_K;
/* We don't break here because preferred page size is 16M. So keep looking for 16M. */
}
index++;
}
*pageSize = preferredPageSize;
} else {
/* Return the page size of data segment.
* This is the same page size as used by JIT code cache when allocated using omrmem_allocate_memory().
*/
uintptr_t dataSegmentPageSize = getDataSegmentPageSize(portLibrary);
*pageSize = (FOUR_K != dataSegmentPageSize)? dataSegmentPageSize : 0;
}
if (NULL != pageFlags) {
*pageFlags = (0 == *pageSize) ? 0 : OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
}
} else {
if (NULL != pageFlags) {
*pageFlags = OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
}
}
return;
}
intptr_t
omrvmem_find_valid_page_size(struct OMRPortLibrary *portLibrary, uintptr_t mode, uintptr_t *pageSize, uintptr_t *pageFlags, BOOLEAN *isSizeSupported)
{
uintptr_t validPageSize = *pageSize;
uintptr_t validPageFlags = *pageFlags;
uintptr_t defaultLargePageSize = 0;
uintptr_t defaultLargePageFlags = OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
Assert_PRT_true_wrapper(OMRPORT_VMEM_PAGE_FLAG_NOT_USED == validPageFlags);
if (0 != validPageSize) {
/* For executable pages search through the list of supported page sizes only if
* - request is for 64K pages, or
* - request is for 16M pages, and
* - 64 bit system OR (32 bit system AND CodeCacheConsolidation is enabled)
*/
#if defined(OMR_ENV_DATA64)
if ((OMRPORT_VMEM_MEMORY_MODE_EXECUTE != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode))
|| (SIXTY_FOUR_K == validPageSize)
|| (SIXTEEN_M == validPageSize)
#else
BOOLEAN codeCacheConsolidationEnabled = FALSE;
/* Check if the TR_ppcCodeCacheConsolidationEnabled env variable is set.
* TR_ppcCodeCacheConsolidationEnabled is a manually set env variable used to indicate
* that Code Cache Consolidation is enabled in the JIT.
*/
if (OMRPORT_VMEM_MEMORY_MODE_EXECUTE == (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) {
if (portLibrary->sysinfo_get_env(portLibrary, "TR_ppcCodeCacheConsolidationEnabled", NULL, 0) != -1) {
codeCacheConsolidationEnabled = TRUE;
}
}
if ((OMRPORT_VMEM_MEMORY_MODE_EXECUTE != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode))
|| ((TRUE == codeCacheConsolidationEnabled) && (SIXTEEN_M == validPageSize))
|| (SIXTY_FOUR_K == validPageSize)
#endif /* defined(OMR_ENV_DATA64) */
) {
uintptr_t pageIndex = 0;
uintptr_t *supportedPageSizes = portLibrary->vmem_supported_page_sizes(portLibrary);
uintptr_t *supportedPageFlags = portLibrary->vmem_supported_page_flags(portLibrary);
for (pageIndex = 0; 0 != supportedPageSizes[pageIndex]; pageIndex++) {
if ((supportedPageSizes[pageIndex] == validPageSize) &&
(supportedPageFlags[pageIndex] == validPageFlags)
) {
goto _end;
}
}
}
}
portLibrary->vmem_default_large_page_size_ex(portLibrary, mode, &defaultLargePageSize, &defaultLargePageFlags);
if (0 != defaultLargePageSize) {
validPageSize = defaultLargePageSize;
validPageFlags = defaultLargePageFlags;
} else {
if (OMRPORT_VMEM_MEMORY_MODE_EXECUTE == (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) {
validPageSize = getDataSegmentPageSize(portLibrary);
validPageFlags = OMRPORT_VMEM_PAGE_FLAG_NOT_USED;
} else {
validPageSize = PPG_vmem_pageSize[0];