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| 1 // Copyright 2017 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 #ifndef BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |
| 6 #define BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |
| 7 |
| 8 #include "base/memory/shared_memory.h" |
| 9 #include "base/synchronization/lock.h" |
| 10 #include "base/trace_event/memory_dump_provider.h" |
| 11 |
| 12 namespace base { |
| 13 |
| 14 namespace trace_event { |
| 15 class ProcessMemoryDump; |
| 16 } |
| 17 |
| 18 // SharedMemoryTracker tracks shared memory usage. |
| 19 class BASE_EXPORT SharedMemoryTracker |
| 20 : public base::trace_event::MemoryDumpProvider { |
| 21 public: |
| 22 // Returns a singleton instance. |
| 23 static SharedMemoryTracker* GetInstance(); |
| 24 |
| 25 // Records shared memory usage on mapping. |
| 26 void IncrementMemoryUsage(const SharedMemory& shared_memory); |
| 27 |
| 28 // Records shared memory usage on unmapping. |
| 29 void DecrementMemoryUsage(const SharedMemory& shared_memory); |
| 30 |
| 31 private: |
| 32 struct Usage { |
| 33 Usage(); |
| 34 Usage(const Usage& rhs); |
| 35 ~Usage(); |
| 36 SharedMemory::UniqueId unique_id; |
| 37 size_t size; |
| 38 }; |
| 39 |
| 40 SharedMemoryTracker(); |
| 41 ~SharedMemoryTracker() override; |
| 42 |
| 43 // base::trace_event::MemoryDumpProvider implementation. |
| 44 bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args, |
| 45 base::trace_event::ProcessMemoryDump* pmd) override; |
| 46 |
| 47 // Used to lock when |usages_| is modified or read. |
| 48 Lock usages_lock_; |
| 49 std::unordered_map<const SharedMemory*, Usage> usages_; |
| 50 |
| 51 DISALLOW_COPY_AND_ASSIGN(SharedMemoryTracker); |
| 52 }; |
| 53 |
| 54 } // namespace base |
| 55 |
| 56 #endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |
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