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     const base::trace_event::MemoryDumpArgs& args,
  32     base::trace_event::ProcessMemoryDump* process_memory_dump) {
  33   // TODO(ssid): Use MemoryDumpArgs to create light dumps when requested
  34   // (crbug.com/499731).
  35
  36   if (isolate_holder_->access_mode() == IsolateHolder::kUseLocker) {
  37     v8::Locker locked(isolate_holder_->isolate());
  38     DumpHeapStatistics(args, process_memory_dump);
  39   } else {
  40     DumpHeapStatistics(args, process_memory_dump);
  41   }
  42   return true;
  43 }
  44
  45 void V8IsolateMemoryDumpProvider::DumpHeapStatistics(
  46     const base::trace_event::MemoryDumpArgs& args,
  47     base::trace_event::ProcessMemoryDump* process_memory_dump) {
  48   std::string dump_base_name =
  49       base::StringPrintf("v8/isolate_%p", isolate_holder_->isolate());
  50
  51   // Dump statistics of the heap's spaces.
  52   std::string space_name_prefix = dump_base_name + "/heap_spaces";
  53   v8::HeapStatistics heap_statistics;
  54   isolate_holder_->isolate()->GetHeapStatistics(&heap_statistics);
  55
  56   size_t known_spaces_used_size = 0;
  57   size_t known_spaces_size = 0;
  58   size_t number_of_spaces = isolate_holder_->isolate()->NumberOfHeapSpaces();
  59   for (size_t space = 0; space < number_of_spaces; space++) {
  60     v8::HeapSpaceStatistics space_statistics;
  61     isolate_holder_->isolate()->GetHeapSpaceStatistics(&space_statistics,
  62                                                        space);
  63     const size_t space_size = space_statistics.space_size();
  64     const size_t space_used_size = space_statistics.space_used_size();
  65
  66     known_spaces_size += space_size;
  67     known_spaces_used_size += space_used_size;
  68
  69     std::string space_dump_name =
  70         space_name_prefix + "/" + space_statistics.space_name();
  71     auto space_dump = process_memory_dump->CreateAllocatorDump(space_dump_name);
  72     space_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
  73                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  74                           space_size);
  75
  76     auto space_allocated_dump = process_memory_dump->CreateAllocatorDump(
  77         space_dump_name + "/allocated_objects");
  78     space_allocated_dump->AddScalar(
  79         base::trace_event::MemoryAllocatorDump::kNameSize,
  80         base::trace_event::MemoryAllocatorDump::kUnitsBytes, space_used_size);
  81   }
  82
  83   // Compute the rest of the memory, not accounted by the spaces above.
  84   std::string other_spaces_name = space_name_prefix + "/other_spaces";
  85   auto other_dump = process_memory_dump->CreateAllocatorDump(other_spaces_name);
  86   other_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
  87                         base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  88                         heap_statistics.total_heap_size() - known_spaces_size);
  89
  90   auto other_allocated_dump = process_memory_dump->CreateAllocatorDump(
  91       other_spaces_name + "/allocated_objects");
  92   other_allocated_dump->AddScalar(
  93       base::trace_event::MemoryAllocatorDump::kNameSize,
  94       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  95       heap_statistics.used_heap_size() - known_spaces_used_size);
  96
  97   // If light dump is requested, then object statistics are not dumped
  98   if (args.level_of_detail ==
  99       base::trace_event::MemoryDumpArgs::LevelOfDetail::LOW)
 100     return;
 101
 102   // Dump statistics of the heap's live objects from last GC.
 103   std::string object_name_prefix = dump_base_name + "/heap_objects";
 104   bool did_dump_object_stats = false;
 105   const size_t object_types =
 106       isolate_holder_->isolate()->NumberOfTrackedHeapObjectTypes();
 107   for (size_t type_index = 0; type_index < object_types; type_index++) {
 108     v8::HeapObjectStatistics object_statistics;
 109     if (!isolate_holder_->isolate()->GetHeapObjectStatisticsAtLastGC(
 110             &object_statistics, type_index))
 111       continue;
 112
 113     std::string dump_name =
 114         object_name_prefix + "/" + object_statistics.object_type();
 115     if (object_statistics.object_sub_type()[0] != '\0')
 116       dump_name += std::string("/") + object_statistics.object_sub_type();
 117     auto object_dump = process_memory_dump->CreateAllocatorDump(dump_name);
 118
 119     object_dump->AddScalar(
 120         base::trace_event::MemoryAllocatorDump::kNameObjectsCount,
 121         base::trace_event::MemoryAllocatorDump::kUnitsObjects,
 122         object_statistics.object_count());
 123     object_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
 124                            base::trace_event::MemoryAllocatorDump::kUnitsBytes,
 125                            object_statistics.object_size());
 126     did_dump_object_stats = true;
 127   }
 128
 129   if (process_memory_dump->GetAllocatorDump(object_name_prefix +
 130                                             "/CODE_TYPE")) {
 131     auto code_kind_dump = process_memory_dump->CreateAllocatorDump(
 132         object_name_prefix + "/CODE_TYPE/CODE_KIND");
 133     auto code_age_dump = process_memory_dump->CreateAllocatorDump(
 134         object_name_prefix + "/CODE_TYPE/CODE_AGE");
 135     process_memory_dump->AddOwnershipEdge(code_kind_dump->guid(),
 136                                           code_age_dump->guid());
 137   }
 138
 139   if (did_dump_object_stats) {
 140     process_memory_dump->AddOwnershipEdge(
 141         process_memory_dump->CreateAllocatorDump(object_name_prefix)->guid(),
 142         process_memory_dump->CreateAllocatorDump(space_name_prefix)->guid());
 143   }
 144 }
 145
 146 }  // namespace gin