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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/platform/wtf/allocator/partitions.h"
#include "base/allocator/partition_alloc_features.h"
#include "base/allocator/partition_alloc_support.h"
#include "base/debug/alias.h"
#include "base/feature_list.h"
#include "base/no_destructor.h"
#include "base/strings/safe_sprintf.h"
#include "base/task/sequenced_task_runner.h"
#include "base/thread_annotations.h"
#include "build/build_config.h"
#include "components/crash/core/common/crash_key.h"
#include "partition_alloc/buildflags.h"
#include "partition_alloc/oom.h"
#include "partition_alloc/page_allocator.h"
#include "partition_alloc/partition_alloc.h"
#include "partition_alloc/partition_alloc_constants.h"
#include "partition_alloc/partition_root.h"
#include "third_party/blink/renderer/platform/wtf/wtf.h"
namespace WTF {
const char* const Partitions::kAllocatedObjectPoolName =
"partition_alloc/allocated_objects";
BASE_FEATURE(kBlinkUseLargeEmptySlotSpanRingForBufferRoot,
"BlinkUseLargeEmptySlotSpanRingForBufferRoot",
#if BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN)
base::FEATURE_ENABLED_BY_DEFAULT);
#else
base::FEATURE_DISABLED_BY_DEFAULT);
#endif
bool Partitions::initialized_ = false;
// These statics are inlined, so cannot be LazyInstances. We create the values,
// and then set the pointers correctly in Initialize().
partition_alloc::PartitionRoot* Partitions::fast_malloc_root_ = nullptr;
partition_alloc::PartitionRoot* Partitions::array_buffer_root_ = nullptr;
partition_alloc::PartitionRoot* Partitions::buffer_root_ = nullptr;
namespace {
// Reads feature configuration and returns a suitable
// `PartitionOptions`.
partition_alloc::PartitionOptions PartitionOptionsFromFeatures() {
using base::features::BackupRefPtrEnabledProcesses;
using base::features::BackupRefPtrMode;
using partition_alloc::PartitionOptions;
#if PA_BUILDFLAG(ENABLE_BACKUP_REF_PTR_SUPPORT)
const auto brp_mode = base::features::kBackupRefPtrModeParam.Get();
const bool process_affected_by_brp_flag =
base::features::kBackupRefPtrEnabledProcessesParam.Get() ==
BackupRefPtrEnabledProcesses::kAllProcesses ||
base::features::kBackupRefPtrEnabledProcessesParam.Get() ==
BackupRefPtrEnabledProcesses::kBrowserAndRenderer;
const bool enable_brp = base::FeatureList::IsEnabled(
base::features::kPartitionAllocBackupRefPtr) &&
(brp_mode == BackupRefPtrMode::kEnabled) &&
process_affected_by_brp_flag;
#else // PA_BUILDFLAG(ENABLE_BACKUP_REF_PTR_SUPPORT)
const bool enable_brp = false;
#endif
const auto brp_setting =
enable_brp ? PartitionOptions::kEnabled : PartitionOptions::kDisabled;
const bool enable_memory_tagging = base::allocator::PartitionAllocSupport::
ShouldEnableMemoryTaggingInRendererProcess();
const auto memory_tagging =
enable_memory_tagging ? partition_alloc::PartitionOptions::kEnabled
: partition_alloc::PartitionOptions::kDisabled;
// No need to call ChangeMemoryTaggingModeForAllThreadsPerProcess() as it will
// be handled in ReconfigureAfterFeatureListInit().
PartitionOptions opts;
opts.backup_ref_ptr = brp_setting;
opts.memory_tagging = {.enabled = memory_tagging};
opts.use_small_single_slot_spans =
base::FeatureList::IsEnabled(
base::features::kPartitionAllocUseSmallSingleSlotSpans)
? partition_alloc::PartitionOptions::kEnabled
: partition_alloc::PartitionOptions::kDisabled;
return opts;
}
} // namespace
// static
void Partitions::Initialize() {
static bool initialized = InitializeOnce();
DCHECK(initialized);
}
// static
bool Partitions::InitializeOnce() {
using partition_alloc::PartitionOptions;
partition_alloc::PartitionAllocGlobalInit(&Partitions::HandleOutOfMemory);
auto options = PartitionOptionsFromFeatures();
const auto actual_brp_setting = options.backup_ref_ptr;
if (base::FeatureList::IsEnabled(
base::features::kPartitionAllocDisableBRPInBufferPartition)) {
options.backup_ref_ptr = PartitionOptions::kDisabled;
}
static base::NoDestructor<partition_alloc::PartitionAllocator>
buffer_allocator(options);
buffer_root_ = buffer_allocator->root();
if (base::FeatureList::IsEnabled(
kBlinkUseLargeEmptySlotSpanRingForBufferRoot)) {
buffer_root_->EnableLargeEmptySlotSpanRing();
}
if (base::FeatureList::IsEnabled(
base::features::kPartitionAllocDisableBRPInBufferPartition)) {
options.backup_ref_ptr = actual_brp_setting;
}
// FastMalloc doesn't provide isolation, only a (hopefully fast) malloc().
// When PartitionAlloc is already the malloc() implementation, there is
// nothing to do.
//
// Note that we could keep the two heaps separate, but each PartitionAlloc's
// root has a cost, both in used memory and in virtual address space. Don't
// pay it when we don't have to.
#if !PA_BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC)
options.thread_cache = PartitionOptions::kEnabled;
static base::NoDestructor<partition_alloc::PartitionAllocator>
fast_malloc_allocator(options);
fast_malloc_root_ = fast_malloc_allocator->root();
#endif
initialized_ = true;
return initialized_;
}
// static
void Partitions::InitializeArrayBufferPartition() {
CHECK(initialized_);
CHECK(!ArrayBufferPartitionInitialized());
// BackupRefPtr disallowed because it will prevent allocations from being 16B
// aligned as required by ArrayBufferContents.
static base::NoDestructor<partition_alloc::PartitionAllocator>
array_buffer_allocator([]() {
partition_alloc::PartitionOptions opts;
opts.backup_ref_ptr = partition_alloc::PartitionOptions::kDisabled;
// When the V8 virtual memory cage is enabled, the ArrayBuffer
// partition must be placed inside of it. For that, PA's
// ConfigurablePool is created inside the V8 Cage during
// initialization. As such, here all we need to do is indicate that
// we'd like to use that Pool if it has been created by now (if it
// hasn't been created, the cage isn't enabled, and so we'll use the
// default Pool).
opts.use_configurable_pool =
partition_alloc::PartitionOptions::kAllowed;
opts.memory_tagging = {
.enabled = partition_alloc::PartitionOptions::kDisabled};
return opts;
}());
array_buffer_root_ = array_buffer_allocator->root();
}
// static
void Partitions::StartMemoryReclaimer(
scoped_refptr<base::SequencedTaskRunner> task_runner) {
CHECK(IsMainThread());
DCHECK(initialized_);
base::allocator::StartMemoryReclaimer(task_runner);
}
// static
void Partitions::DumpMemoryStats(
bool is_light_dump,
partition_alloc::PartitionStatsDumper* partition_stats_dumper) {
// Object model and rendering partitions are not thread safe and can be
// accessed only on the main thread.
DCHECK(IsMainThread());
if (auto* fast_malloc_partition = FastMallocPartition()) {
fast_malloc_partition->DumpStats("fast_malloc", is_light_dump,
partition_stats_dumper);
}
if (ArrayBufferPartitionInitialized()) {
ArrayBufferPartition()->DumpStats("array_buffer", is_light_dump,
partition_stats_dumper);
}
BufferPartition()->DumpStats("buffer", is_light_dump, partition_stats_dumper);
}
namespace {
class LightPartitionStatsDumperImpl
: public partition_alloc::PartitionStatsDumper {
public:
LightPartitionStatsDumperImpl() : total_active_bytes_(0) {}
void PartitionDumpTotals(
const char* partition_name,
const partition_alloc::PartitionMemoryStats* memory_stats) override {
total_active_bytes_ += memory_stats->total_active_bytes;
}
void PartitionsDumpBucketStats(
const char* partition_name,
const partition_alloc::PartitionBucketMemoryStats*) override {}
size_t TotalActiveBytes() const { return total_active_bytes_; }
private:
size_t total_active_bytes_;
};
} // namespace
// static
size_t Partitions::TotalSizeOfCommittedPages() {
DCHECK(initialized_);
size_t total_size = 0;
// Racy reads below: this is fine to collect statistics.
if (auto* fast_malloc_partition = FastMallocPartition()) {
total_size +=
TS_UNCHECKED_READ(fast_malloc_partition->total_size_of_committed_pages);
}
if (ArrayBufferPartitionInitialized()) {
total_size += TS_UNCHECKED_READ(
ArrayBufferPartition()->total_size_of_committed_pages);
}
total_size +=
TS_UNCHECKED_READ(BufferPartition()->total_size_of_committed_pages);
return total_size;
}
// static
size_t Partitions::TotalActiveBytes() {
LightPartitionStatsDumperImpl dumper;
WTF::Partitions::DumpMemoryStats(true, &dumper);
return dumper.TotalActiveBytes();
}
NOINLINE static void PartitionsOutOfMemoryUsing2G(size_t size) {
NO_CODE_FOLDING();
size_t signature = 2UL * 1024 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsing1G(size_t size) {
NO_CODE_FOLDING();
size_t signature = 1UL * 1024 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsing512M(size_t size) {
NO_CODE_FOLDING();
size_t signature = 512 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsing256M(size_t size) {
NO_CODE_FOLDING();
size_t signature = 256 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsing128M(size_t size) {
NO_CODE_FOLDING();
size_t signature = 128 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsing64M(size_t size) {
NO_CODE_FOLDING();
size_t signature = 64 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsing32M(size_t size) {
NO_CODE_FOLDING();
size_t signature = 32 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsing16M(size_t size) {
NO_CODE_FOLDING();
size_t signature = 16 * 1024 * 1024;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
NOINLINE static void PartitionsOutOfMemoryUsingLessThan16M(size_t size) {
NO_CODE_FOLDING();
size_t signature = 16 * 1024 * 1024 - 1;
base::debug::Alias(&signature);
OOM_CRASH(size);
}
// static
void* Partitions::BufferMalloc(size_t n, const char* type_name) {
return BufferPartition()->Alloc(n, type_name);
}
// static
void* Partitions::BufferTryRealloc(void* p, size_t n, const char* type_name) {
return BufferPartition()->Realloc<partition_alloc::AllocFlags::kReturnNull>(
p, n, type_name);
}
// static
void Partitions::BufferFree(void* p) {
BufferPartition()->Free(p);
}
// static
size_t Partitions::BufferPotentialCapacity(size_t n) {
return BufferPartition()->AllocationCapacityFromRequestedSize(n);
}
// Ideally this would be removed when PartitionAlloc is malloc(), but there are
// quite a few callers. Just forward to the C functions instead. Most of the
// usual callers will never reach here though, as USING_FAST_MALLOC() becomes a
// no-op.
// static
void* Partitions::FastMalloc(size_t n, const char* type_name) {
auto* fast_malloc_partition = FastMallocPartition();
if (fast_malloc_partition) [[unlikely]] {
return fast_malloc_partition->Alloc(n, type_name);
} else {
return malloc(n);
}
}
// static
void* Partitions::FastZeroedMalloc(size_t n, const char* type_name) {
auto* fast_malloc_partition = FastMallocPartition();
if (fast_malloc_partition) [[unlikely]] {
return fast_malloc_partition
->AllocInline<partition_alloc::AllocFlags::kZeroFill>(n, type_name);
} else {
return calloc(n, 1);
}
}
// static
void Partitions::FastFree(void* p) {
auto* fast_malloc_partition = FastMallocPartition();
if (fast_malloc_partition) [[unlikely]] {
fast_malloc_partition->Free(p);
} else {
free(p);
}
}
// static
void Partitions::HandleOutOfMemory(size_t size) {
volatile size_t total_usage = TotalSizeOfCommittedPages();
uint32_t alloc_page_error_code = partition_alloc::GetAllocPageErrorCode();
base::debug::Alias(&alloc_page_error_code);
// Report the total mapped size from PageAllocator. This is intended to
// distinguish better between address space exhaustion and out of memory on 32
// bit platforms. PartitionAlloc can use a lot of address space, as free pages
// are not shared between buckets (see crbug.com/421387). There is already
// reporting for this, however it only looks at the address space usage of a
// single partition. This allows to look across all the partitions, and other
// users such as V8.
char value[24];
// %d works for 64 bit types as well with SafeSPrintf(), see its unit tests
// for an example.
base::strings::SafeSPrintf(value, "%d",
partition_alloc::GetTotalMappedSize());
static crash_reporter::CrashKeyString<24> g_page_allocator_mapped_size(
"page-allocator-mapped-size");
g_page_allocator_mapped_size.Set(value);
if (total_usage >= 2UL * 1024 * 1024 * 1024) {
PartitionsOutOfMemoryUsing2G(size);
}
if (total_usage >= 1UL * 1024 * 1024 * 1024) {
PartitionsOutOfMemoryUsing1G(size);
}
if (total_usage >= 512 * 1024 * 1024) {
PartitionsOutOfMemoryUsing512M(size);
}
if (total_usage >= 256 * 1024 * 1024) {
PartitionsOutOfMemoryUsing256M(size);
}
if (total_usage >= 128 * 1024 * 1024) {
PartitionsOutOfMemoryUsing128M(size);
}
if (total_usage >= 64 * 1024 * 1024) {
PartitionsOutOfMemoryUsing64M(size);
}
if (total_usage >= 32 * 1024 * 1024) {
PartitionsOutOfMemoryUsing32M(size);
}
if (total_usage >= 16 * 1024 * 1024) {
PartitionsOutOfMemoryUsing16M(size);
}
PartitionsOutOfMemoryUsingLessThan16M(size);
}
// static
void Partitions::AdjustPartitionsForForeground() {
DCHECK(initialized_);
if (base::FeatureList::IsEnabled(
base::features::kPartitionAllocAdjustSizeWhenInForeground)) {
array_buffer_root_->AdjustForForeground();
buffer_root_->AdjustForForeground();
if (fast_malloc_root_) {
fast_malloc_root_->AdjustForForeground();
}
}
}
// static
void Partitions::AdjustPartitionsForBackground() {
DCHECK(initialized_);
if (base::FeatureList::IsEnabled(
base::features::kPartitionAllocAdjustSizeWhenInForeground)) {
array_buffer_root_->AdjustForBackground();
buffer_root_->AdjustForBackground();
if (fast_malloc_root_) {
fast_malloc_root_->AdjustForBackground();
}
}
}
} // namespace WTF
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