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 known_spaces_physical_size = 0;
  59   size_t number_of_spaces = isolate_holder_->isolate()->NumberOfHeapSpaces();
  60   for (size_t space = 0; space < number_of_spaces; space++) {
  61     v8::HeapSpaceStatistics space_statistics;
  62     isolate_holder_->isolate()->GetHeapSpaceStatistics(&space_statistics,
  63                                                        space);
  64     const size_t space_size = space_statistics.space_size();
  65     const size_t space_used_size = space_statistics.space_used_size();
  66     const size_t space_physical_size = space_statistics.physical_space_size();
  67
  68     known_spaces_size += space_size;
  69     known_spaces_used_size += space_used_size;
  70     known_spaces_physical_size += space_physical_size;
  71
  72     std::string space_dump_name =
  73         space_name_prefix + "/" + space_statistics.space_name();
  74     auto space_dump = process_memory_dump->CreateAllocatorDump(space_dump_name);
  75     space_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
  76                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  77                           space_physical_size);
  78
  79     space_dump->AddScalar("virtual_size",
  80                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  81                           space_size);
  82
  83     space_dump->AddScalar("allocated_objects_size",
  84                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  85                           space_used_size);
  86   }
  87
  88   // Compute the rest of the memory, not accounted by the spaces above.
  89   std::string other_spaces_name = space_name_prefix + "/other_spaces";
  90   auto other_dump = process_memory_dump->CreateAllocatorDump(other_spaces_name);
  91
  92   other_dump->AddScalar(
  93       base::trace_event::MemoryAllocatorDump::kNameSize,
  94       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  95       heap_statistics.total_physical_size() - known_spaces_physical_size);
  96
  97   other_dump->AddScalar(
  98       "allocated_objects_size",
  99       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
 100       heap_statistics.used_heap_size() - known_spaces_used_size);
 101
 102   other_dump->AddScalar("virtual_size",
 103                         base::trace_event::MemoryAllocatorDump::kUnitsBytes,
 104                         heap_statistics.total_heap_size() - known_spaces_size);
 105
 106   // If light dump is requested, then object statistics are not dumped
 107   if (args.level_of_detail ==
 108       base::trace_event::MemoryDumpArgs::LevelOfDetail::LOW)
 109     return;
 110
 111   // Dump statistics of the heap's live objects from last GC.
 112   // TODO(primiano): these should not be tracked in the same trace event as they
 113   // report stats for the last GC (not the current state). See crbug.com/498779.
 114   std::string object_name_prefix = dump_base_name + "/heap_objects_at_last_gc";
 115   bool did_dump_object_stats = false;
 116   const size_t object_types =
 117       isolate_holder_->isolate()->NumberOfTrackedHeapObjectTypes();
 118   for (size_t type_index = 0; type_index < object_types; type_index++) {
 119     v8::HeapObjectStatistics object_statistics;
 120     if (!isolate_holder_->isolate()->GetHeapObjectStatisticsAtLastGC(
 121             &object_statistics, type_index))
 122       continue;
 123
 124     std::string dump_name =
 125         object_name_prefix + "/" + object_statistics.object_type();
 126     if (object_statistics.object_sub_type()[0] != '\0')
 127       dump_name += std::string("/") + object_statistics.object_sub_type();
 128     auto object_dump = process_memory_dump->CreateAllocatorDump(dump_name);
 129
 130     object_dump->AddScalar(
 131         base::trace_event::MemoryAllocatorDump::kNameObjectCount,
 132         base::trace_event::MemoryAllocatorDump::kUnitsObjects,
 133         object_statistics.object_count());
 134     object_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
 135                            base::trace_event::MemoryAllocatorDump::kUnitsBytes,
 136                            object_statistics.object_size());
 137     did_dump_object_stats = true;
 138   }
 139
 140   if (process_memory_dump->GetAllocatorDump(object_name_prefix +
 141                                             "/CODE_TYPE")) {
 142     auto code_kind_dump = process_memory_dump->CreateAllocatorDump(
 143         object_name_prefix + "/CODE_TYPE/CODE_KIND");
 144     auto code_age_dump = process_memory_dump->CreateAllocatorDump(
 145         object_name_prefix + "/CODE_TYPE/CODE_AGE");
 146     process_memory_dump->AddOwnershipEdge(code_kind_dump->guid(),
 147                                           code_age_dump->guid());
 148   }
 149
 150   if (did_dump_object_stats) {
 151     process_memory_dump->AddOwnershipEdge(
 152         process_memory_dump->CreateAllocatorDump(object_name_prefix)->guid(),
 153         process_memory_dump->CreateAllocatorDump(space_name_prefix)->guid());
 154   }
 155 }
 156
 157 }  // namespace gin