gin/v8_isolate_memory_dump_provider.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gin/v8_isolate_memory_dump_provider.h"
   6
   7 #include "base/message_loop/message_loop.h"
   8 #include "base/strings/stringprintf.h"
   9 #include "base/thread_task_runner_handle.h"
  10 #include "base/trace_event/memory_dump_manager.h"
  11 #include "base/trace_event/process_memory_dump.h"
  12 #include "gin/public/isolate_holder.h"
  13 #include "v8/include/v8.h"
  14
  15 namespace gin {
  16
  17 namespace {
  18 const char kRootDumpName[] = "v8";
  19 const char kIsolateDumpName[] = "isolate";
  20 const char kHeapSpacesDumpName[] = "heap_spaces";
  21 const char kAvailableSizeAttribute[] = "available_size_in_bytes";
  22 }  // namespace
  23
  24 V8IsolateMemoryDumpProvider::V8IsolateMemoryDumpProvider(
  25     IsolateHolder* isolate_holder)
  26     : isolate_holder_(isolate_holder) {
  27   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
  28       this, base::ThreadTaskRunnerHandle::Get());
  29 }
  30
  31 V8IsolateMemoryDumpProvider::~V8IsolateMemoryDumpProvider() {
  32   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
  33       this);
  34 }
  35
  36 // Called at trace dump point time. Creates a snapshot with the memory counters
  37 // for the current isolate.
  38 bool V8IsolateMemoryDumpProvider::OnMemoryDump(
  39     base::trace_event::ProcessMemoryDump* pmd) {
  40   if (isolate_holder_->access_mode() == IsolateHolder::kUseLocker) {
  41     v8::Locker locked(isolate_holder_->isolate());
  42     DumpMemoryStatistics(pmd);
  43   } else {
  44     DumpMemoryStatistics(pmd);
  45   }
  46   return true;
  47 }
  48
  49 void V8IsolateMemoryDumpProvider::DumpMemoryStatistics(
  50     base::trace_event::ProcessMemoryDump* pmd) {
  51   v8::HeapStatistics heap_statistics;
  52   isolate_holder_->isolate()->GetHeapStatistics(&heap_statistics);
  53
  54   size_t known_spaces_used_size = 0;
  55   size_t known_spaces_size = 0;
  56   size_t number_of_spaces = isolate_holder_->isolate()->NumberOfHeapSpaces();
  57   for (size_t space = 0; space < number_of_spaces; space++) {
  58     v8::HeapSpaceStatistics space_statistics;
  59     isolate_holder_->isolate()->GetHeapSpaceStatistics(&space_statistics,
  60                                                        space);
  61     const size_t space_size = space_statistics.space_size();
  62     const size_t space_used_size = space_statistics.space_used_size();
  63
  64     known_spaces_size += space_size;
  65     known_spaces_used_size += space_used_size;
  66
  67     std::string allocator_name =
  68         base::StringPrintf("%s/%s_%p/%s/%s", kRootDumpName, kIsolateDumpName,
  69                            isolate_holder_->isolate(), kHeapSpacesDumpName,
  70                            space_statistics.space_name());
  71     base::trace_event::MemoryAllocatorDump* space_dump =
  72         pmd->CreateAllocatorDump(allocator_name);
  73     space_dump->AddScalar(
  74         base::trace_event::MemoryAllocatorDump::kNameOuterSize,
  75         base::trace_event::MemoryAllocatorDump::kUnitsBytes, space_size);
  76
  77     // TODO(ssid): Fix crbug.com/481504 to get the objects count of live objects
  78     // after the last GC.
  79     space_dump->AddScalar(
  80         base::trace_event::MemoryAllocatorDump::kNameInnerSize,
  81         base::trace_event::MemoryAllocatorDump::kUnitsBytes, space_used_size);
  82     space_dump->AddScalar(kAvailableSizeAttribute,
  83                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  84                           space_statistics.space_available_size());
  85   }
  86   // Compute the rest of the memory, not accounted by the spaces above.
  87   std::string allocator_name = base::StringPrintf(
  88       "%s/%s_%p/%s/%s", kRootDumpName, kIsolateDumpName,
  89       isolate_holder_->isolate(), kHeapSpacesDumpName, "other_spaces");
  90   base::trace_event::MemoryAllocatorDump* other_spaces_dump =
  91       pmd->CreateAllocatorDump(allocator_name);
  92   other_spaces_dump->AddScalar(
  93       base::trace_event::MemoryAllocatorDump::kNameOuterSize,
  94       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  95       heap_statistics.total_heap_size() - known_spaces_size);
  96   other_spaces_dump->AddScalar(
  97       base::trace_event::MemoryAllocatorDump::kNameInnerSize,
  98       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  99       heap_statistics.used_heap_size() - known_spaces_used_size);
 100
 101   // TODO(ssid): Fix crbug.com/481504 to get the total available size of the
 102   // heap.
 103   other_spaces_dump->AddScalar(
 104       kAvailableSizeAttribute,
 105       base::trace_event::MemoryAllocatorDump::kUnitsBytes, 0);
 106 }
 107
 108 }  // namespace gin