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/strings/stringprintf.h"
   8 #include "base/thread_task_runner_handle.h"
   9 #include "base/trace_event/memory_dump_manager.h"
  10 #include "base/trace_event/process_memory_dump.h"
  11 #include "gin/public/isolate_holder.h"
  12 #include "v8/include/v8.h"
  13
  14 namespace gin {
  15
  16 V8IsolateMemoryDumpProvider::V8IsolateMemoryDumpProvider(
  17     IsolateHolder* isolate_holder)
  18     : isolate_holder_(isolate_holder) {
  19   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
  20       this, base::ThreadTaskRunnerHandle::Get());
  21 }
  22
  23 V8IsolateMemoryDumpProvider::~V8IsolateMemoryDumpProvider() {
  24   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
  25       this);
  26 }
  27
  28 // Called at trace dump point time. Creates a snapshot with the memory counters
  29 // for the current isolate.
  30 bool V8IsolateMemoryDumpProvider::OnMemoryDump(
  31     base::trace_event::ProcessMemoryDump* process_memory_dump) {
  32   if (isolate_holder_->access_mode() == IsolateHolder::kUseLocker) {
  33     v8::Locker locked(isolate_holder_->isolate());
  34     DumpHeapStatistics(process_memory_dump);
  35   } else {
  36     DumpHeapStatistics(process_memory_dump);
  37   }
  38   return true;
  39 }
  40
  41 void V8IsolateMemoryDumpProvider::DumpHeapStatistics(
  42     base::trace_event::ProcessMemoryDump* process_memory_dump) {
  43   std::string dump_base_name =
  44       base::StringPrintf("v8/isolate_%p", isolate_holder_->isolate());
  45
  46   // Dump statistics of the heap's spaces.
  47   std::string space_name_prefix = dump_base_name + "/heap_spaces";
  48   v8::HeapStatistics heap_statistics;
  49   isolate_holder_->isolate()->GetHeapStatistics(&heap_statistics);
  50
  51   size_t known_spaces_used_size = 0;
  52   size_t known_spaces_size = 0;
  53   size_t number_of_spaces = isolate_holder_->isolate()->NumberOfHeapSpaces();
  54   for (size_t space = 0; space < number_of_spaces; space++) {
  55     v8::HeapSpaceStatistics space_statistics;
  56     isolate_holder_->isolate()->GetHeapSpaceStatistics(&space_statistics,
  57                                                        space);
  58     const size_t space_size = space_statistics.space_size();
  59     const size_t space_used_size = space_statistics.space_used_size();
  60
  61     known_spaces_size += space_size;
  62     known_spaces_used_size += space_used_size;
  63
  64     std::string space_dump_name =
  65         space_name_prefix + "/" + space_statistics.space_name();
  66     auto space_dump = process_memory_dump->CreateAllocatorDump(space_dump_name);
  67     space_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
  68                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  69                           space_size);
  70
  71     auto space_allocated_dump = process_memory_dump->CreateAllocatorDump(
  72         space_dump_name + "/allocated_objects");
  73     space_allocated_dump->AddScalar(
  74         base::trace_event::MemoryAllocatorDump::kNameSize,
  75         base::trace_event::MemoryAllocatorDump::kUnitsBytes, space_used_size);
  76   }
  77
  78   // Compute the rest of the memory, not accounted by the spaces above.
  79   std::string other_spaces_name = space_name_prefix + "/other_spaces";
  80   auto other_dump = process_memory_dump->CreateAllocatorDump(other_spaces_name);
  81   other_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
  82                         base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  83                         heap_statistics.total_heap_size() - known_spaces_size);
  84
  85   auto other_allocated_dump = process_memory_dump->CreateAllocatorDump(
  86       other_spaces_name + "/allocated_objects");
  87   other_allocated_dump->AddScalar(
  88       base::trace_event::MemoryAllocatorDump::kNameSize,
  89       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  90       heap_statistics.used_heap_size() - known_spaces_used_size);
  91
  92   // Dump statistics of the heap's live objects from last GC.
  93   std::string object_name_prefix = dump_base_name + "/heap_objects";
  94   bool did_dump_object_stats = false;
  95   const size_t object_types =
  96       isolate_holder_->isolate()->NumberOfTrackedHeapObjectTypes();
  97   for (size_t type_index = 0; type_index < object_types; type_index++) {
  98     v8::HeapObjectStatistics object_statistics;
  99     if (!isolate_holder_->isolate()->GetHeapObjectStatisticsAtLastGC(
 100             &object_statistics, type_index))
 101       continue;
 102
 103     std::string dump_name =
 104         object_name_prefix + "/" + object_statistics.object_type();
 105     if (object_statistics.object_sub_type()[0] != '\0')
 106       dump_name += std::string("/") + object_statistics.object_sub_type();
 107     auto object_dump = process_memory_dump->CreateAllocatorDump(dump_name);
 108
 109     object_dump->AddScalar(
 110         base::trace_event::MemoryAllocatorDump::kNameObjectsCount,
 111         base::trace_event::MemoryAllocatorDump::kUnitsObjects,
 112         object_statistics.object_count());
 113     object_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
 114                            base::trace_event::MemoryAllocatorDump::kUnitsBytes,
 115                            object_statistics.object_size());
 116     did_dump_object_stats = true;
 117   }
 118
 119   if (process_memory_dump->GetAllocatorDump(object_name_prefix +
 120                                             "/CODE_TYPE")) {
 121     auto code_kind_dump = process_memory_dump->CreateAllocatorDump(
 122         object_name_prefix + "/CODE_TYPE/CODE_KIND");
 123     auto code_age_dump = process_memory_dump->CreateAllocatorDump(
 124         object_name_prefix + "/CODE_TYPE/CODE_AGE");
 125     process_memory_dump->AddOwnershipEdge(code_kind_dump->guid(),
 126                                           code_age_dump->guid());
 127   }
 128
 129   if (did_dump_object_stats) {
 130     process_memory_dump->AddOwnershipEdge(
 131         process_memory_dump->CreateAllocatorDump(object_name_prefix)->guid(),
 132         process_memory_dump->CreateAllocatorDump(space_name_prefix)->guid());
 133   }
 134 }
 135
 136 }  // namespace gin