| // 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. |
| |
| #ifndef BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |
| #define BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |
| |
| #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 { |
| public: |
| // 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[]; |
| |
| private: |
| SharedMemoryTracker(); |
| ~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_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SharedMemoryTracker); |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |