gin/v8_shared_memory_dump_provider.cc

   1 // Copyright 2019 The Chromium Authors
   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_shared_memory_dump_provider.h"
   6
   7 #include <string>
   8
   9 #include "base/memory/singleton.h"
  10 #include "base/trace_event/memory_dump_manager.h"
  11 #include "base/trace_event/process_memory_dump.h"
  12 #include "v8/include/v8-initialization.h"
  13 #include "v8/include/v8-isolate.h"
  14
  15 namespace gin {
  16
  17 V8SharedMemoryDumpProvider::V8SharedMemoryDumpProvider() {
  18   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
  19       this, "V8SharedMemory", nullptr);
  20 }
  21
  22 // static
  23 void V8SharedMemoryDumpProvider::Register() {
  24   // The provider is registered as part of the constructor, so all this does is
  25   // access the singleton causing it to be constructed on the first access.
  26   base::Singleton<
  27       V8SharedMemoryDumpProvider,
  28       base::LeakySingletonTraits<V8SharedMemoryDumpProvider>>::get();
  29 }
  30
  31 // Called at trace dump point time. Creates a snapshot with the memory counters
  32 // for the current isolate.
  33 bool V8SharedMemoryDumpProvider::OnMemoryDump(
  34     const base::trace_event::MemoryDumpArgs& args,
  35     base::trace_event::ProcessMemoryDump* process_memory_dump) {
  36   v8::SharedMemoryStatistics shared_memory_statistics;
  37   v8::V8::GetSharedMemoryStatistics(&shared_memory_statistics);
  38
  39   std::string dump_base_name = "v8/shared";
  40   auto* shared_memory_dump = process_memory_dump->CreateAllocatorDump(
  41       dump_base_name + "/read_only_space");
  42   shared_memory_dump->AddScalar(
  43       base::trace_event::MemoryAllocatorDump::kNameSize,
  44       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  45       shared_memory_statistics.read_only_space_physical_size());
  46   shared_memory_dump->AddScalar(
  47       "allocated_objects_size",
  48       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  49       shared_memory_statistics.read_only_space_used_size());
  50   shared_memory_dump->AddScalar(
  51       "virtual_size", base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  52       shared_memory_statistics.read_only_space_size());
  53
  54   return true;
  55 }
  56
  57 }  // namespace gin