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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 Lock lock_; | |
danakj
2017/03/06 16:06:04
Can you name this usages_lock_? And/or add a comme
hajimehoshi
2017/03/07 06:22:34
Done.
| |
48 std::unordered_map<const SharedMemory*, Usage> usages_; | |
49 | |
50 DISALLOW_COPY_AND_ASSIGN(SharedMemoryTracker); | |
51 }; | |
52 | |
53 } // namespace base | |
54 | |
55 #endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ | |
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