blob: 601937b45f0a2820b0789c14a90263016df9448b [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gin/v8_isolate_memory_dump_provider.h"
#include <inttypes.h>
#include <stddef.h>
#include "base/strings/stringprintf.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/memory_dump_manager.h"
#include "base/trace_event/process_memory_dump.h"
#include "gin/public/isolate_holder.h"
#include "v8/include/v8.h"
namespace gin {
V8IsolateMemoryDumpProvider::V8IsolateMemoryDumpProvider(
IsolateHolder* isolate_holder)
: isolate_holder_(isolate_holder) {
base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
this, "V8Isolate", base::ThreadTaskRunnerHandle::Get());
}
V8IsolateMemoryDumpProvider::~V8IsolateMemoryDumpProvider() {
base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
this);
}
// Called at trace dump point time. Creates a snapshot with the memory counters
// for the current isolate.
bool V8IsolateMemoryDumpProvider::OnMemoryDump(
const base::trace_event::MemoryDumpArgs& args,
base::trace_event::ProcessMemoryDump* process_memory_dump) {
// TODO(ssid): Use MemoryDumpArgs to create light dumps when requested
// (crbug.com/499731).
if (isolate_holder_->access_mode() == IsolateHolder::kUseLocker) {
v8::Locker locked(isolate_holder_->isolate());
DumpHeapStatistics(args, process_memory_dump);
} else {
DumpHeapStatistics(args, process_memory_dump);
}
return true;
}
namespace {
// Dump statistics related to code/bytecode when memory-infra.v8.code_stats is
// enabled.
void DumpCodeStatistics(
base::trace_event::MemoryAllocatorDump* heap_spaces_dump,
IsolateHolder* isolate_holder) {
// Collecting code statistics is an expensive operation (~10 ms) when
// compared to other v8 metrics (< 1 ms). So, dump them only when
// memory-infra.v8.code_stats is enabled.
// TODO(primiano): This information should be plumbed through TraceConfig.
// See crbug.com/616441.
bool dump_code_stats = false;
TRACE_EVENT_CATEGORY_GROUP_ENABLED(
TRACE_DISABLED_BY_DEFAULT("memory-infra.v8.code_stats"),
&dump_code_stats);
if (!dump_code_stats)
return;
v8::HeapCodeStatistics code_statistics;
if (!isolate_holder->isolate()->GetHeapCodeAndMetadataStatistics(
&code_statistics)) {
return;
}
heap_spaces_dump->AddScalar(
"code_and_metadata_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
code_statistics.code_and_metadata_size());
heap_spaces_dump->AddScalar(
"bytecode_and_metadata_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
code_statistics.bytecode_and_metadata_size());
}
} // namespace anonymous
void V8IsolateMemoryDumpProvider::DumpHeapStatistics(
const base::trace_event::MemoryDumpArgs& args,
base::trace_event::ProcessMemoryDump* process_memory_dump) {
std::string dump_base_name = base::StringPrintf(
"v8/isolate_0x%" PRIXPTR,
reinterpret_cast<uintptr_t>(isolate_holder_->isolate()));
// Dump statistics of the heap's spaces.
std::string space_name_prefix = dump_base_name + "/heap_spaces";
v8::HeapStatistics heap_statistics;
isolate_holder_->isolate()->GetHeapStatistics(&heap_statistics);
size_t known_spaces_used_size = 0;
size_t known_spaces_size = 0;
size_t known_spaces_physical_size = 0;
size_t number_of_spaces = isolate_holder_->isolate()->NumberOfHeapSpaces();
for (size_t space = 0; space < number_of_spaces; space++) {
v8::HeapSpaceStatistics space_statistics;
isolate_holder_->isolate()->GetHeapSpaceStatistics(&space_statistics,
space);
const size_t space_size = space_statistics.space_size();
const size_t space_used_size = space_statistics.space_used_size();
const size_t space_physical_size = space_statistics.physical_space_size();
known_spaces_size += space_size;
known_spaces_used_size += space_used_size;
known_spaces_physical_size += space_physical_size;
std::string space_dump_name =
space_name_prefix + "/" + space_statistics.space_name();
auto* space_dump =
process_memory_dump->CreateAllocatorDump(space_dump_name);
space_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
space_physical_size);
space_dump->AddScalar("virtual_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
space_size);
space_dump->AddScalar("allocated_objects_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
space_used_size);
}
// Compute the rest of the memory, not accounted by the spaces above.
std::string other_spaces_name = space_name_prefix + "/other_spaces";
auto* other_dump =
process_memory_dump->CreateAllocatorDump(other_spaces_name);
other_dump->AddScalar(
base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
heap_statistics.total_physical_size() - known_spaces_physical_size);
other_dump->AddScalar(
"allocated_objects_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
heap_statistics.used_heap_size() - known_spaces_used_size);
other_dump->AddScalar("virtual_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
heap_statistics.total_heap_size() - known_spaces_size);
// If V8 zaps garbage, all the memory mapped regions become resident,
// so we add an extra dump to avoid mismatches w.r.t. the total
// resident values.
if (heap_statistics.does_zap_garbage()) {
auto* zap_dump = process_memory_dump->CreateAllocatorDump(
dump_base_name + "/zapped_for_debug");
zap_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
heap_statistics.total_heap_size() -
heap_statistics.total_physical_size());
}
// Dump statistics about malloced memory.
std::string malloc_name = dump_base_name + "/malloc";
auto* malloc_dump = process_memory_dump->CreateAllocatorDump(malloc_name);
malloc_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
heap_statistics.malloced_memory());
const char* system_allocator_name =
base::trace_event::MemoryDumpManager::GetInstance()
->system_allocator_pool_name();
if (system_allocator_name) {
process_memory_dump->AddSuballocation(malloc_dump->guid(),
system_allocator_name);
}
// Add an empty row for the heap_spaces. This is to keep the shape of the
// dump stable, whether code stats are enabled or not.
auto* heap_spaces_dump =
process_memory_dump->CreateAllocatorDump(space_name_prefix);
// Dump object statistics only for detailed dumps.
if (args.level_of_detail !=
base::trace_event::MemoryDumpLevelOfDetail::DETAILED) {
return;
}
// Dump statistics of the heap's live objects from last GC.
// TODO(primiano): these should not be tracked in the same trace event as they
// report stats for the last GC (not the current state). See crbug.com/498779.
std::string object_name_prefix = dump_base_name + "/heap_objects_at_last_gc";
bool did_dump_object_stats = false;
const size_t object_types =
isolate_holder_->isolate()->NumberOfTrackedHeapObjectTypes();
for (size_t type_index = 0; type_index < object_types; type_index++) {
v8::HeapObjectStatistics object_statistics;
if (!isolate_holder_->isolate()->GetHeapObjectStatisticsAtLastGC(
&object_statistics, type_index))
continue;
std::string dump_name =
object_name_prefix + "/" + object_statistics.object_type();
if (object_statistics.object_sub_type()[0] != '\0')
dump_name += std::string("/") + object_statistics.object_sub_type();
auto* object_dump = process_memory_dump->CreateAllocatorDump(dump_name);
object_dump->AddScalar(
base::trace_event::MemoryAllocatorDump::kNameObjectCount,
base::trace_event::MemoryAllocatorDump::kUnitsObjects,
object_statistics.object_count());
object_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
object_statistics.object_size());
did_dump_object_stats = true;
}
if (process_memory_dump->GetAllocatorDump(object_name_prefix +
"/CODE_TYPE")) {
auto* code_kind_dump = process_memory_dump->CreateAllocatorDump(
object_name_prefix + "/CODE_TYPE/CODE_KIND");
auto* code_age_dump = process_memory_dump->CreateAllocatorDump(
object_name_prefix + "/CODE_TYPE/CODE_AGE");
process_memory_dump->AddOwnershipEdge(code_kind_dump->guid(),
code_age_dump->guid());
}
if (did_dump_object_stats) {
process_memory_dump->AddOwnershipEdge(
process_memory_dump->CreateAllocatorDump(object_name_prefix)->guid(),
heap_spaces_dump->guid());
}
// Dump statistics related to code and bytecode if requested.
DumpCodeStatistics(heap_spaces_dump, isolate_holder_);
}
} // namespace gin