blob: 9b1e1212b9e8662f34eca02098841939721cd2b2 [file] [log] [blame]
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <map>
#include <string>
#include "base/memory/shared_memory.h"
#include "base/synchronization/lock.h"
#include "base/trace_event/memory_dump_provider.h"
namespace base {
namespace trace_event {
class MemoryAllocatorDump;
class MemoryAllocatorDumpGuid;
class ProcessMemoryDump;
// SharedMemoryTracker tracks shared memory usage.
class BASE_EXPORT SharedMemoryTracker : public trace_event::MemoryDumpProvider {
// Returns a singleton instance.
static SharedMemoryTracker* GetInstance();
static std::string GetDumpNameForTracing(const UnguessableToken& id);
static trace_event::MemoryAllocatorDumpGuid GetGlobalDumpIdForTracing(
const UnguessableToken& id);
// Gets or creates if non-existant, a memory dump for the |shared_memory|
// inside the given |pmd|. Also adds the necessary edges for the dump when
// creating the dump.
static const trace_event::MemoryAllocatorDump* GetOrCreateSharedMemoryDump(
const SharedMemory* shared_memory,
trace_event::ProcessMemoryDump* pmd);
// Records shared memory usage on mapping.
void IncrementMemoryUsage(const SharedMemory& shared_memory);
// Records shared memory usage on unmapping.
void DecrementMemoryUsage(const SharedMemory& shared_memory);
// Root dump name for all shared memory dumps.
static const char kDumpRootName[];
~SharedMemoryTracker() override;
// trace_event::MemoryDumpProvider implementation.
bool OnMemoryDump(const trace_event::MemoryDumpArgs& args,
trace_event::ProcessMemoryDump* pmd) override;
// Used to lock when |usages_| is modified or read.
Lock usages_lock_;
std::map<const SharedMemory*, size_t> usages_;
} // namespace base