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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/atomicops.h" | |
9 #include "base/memory/shared_memory_handle.h" | |
10 #include "base/memory/singleton.h" | |
11 #include "base/trace_event/memory_dump_provider.h" | |
12 | |
13 namespace base { | |
14 | |
15 class SharedMemory; | |
16 | |
17 namespace trace_event { | |
18 | |
19 class MemoryAllocatorDumpGuid; | |
20 class ProcessMemoryDump; | |
21 } | |
22 | |
23 class BASE_EXPORT SharedMemoryTracker | |
24 : public base::trace_event::MemoryDumpProvider { | |
25 public: | |
26 // Returns a singleton instance. | |
27 static SharedMemoryTracker* GetInstance(); | |
28 | |
29 static bool AddOwnershipEdgeToSharedGlobalDump( | |
30 trace_event::ProcessMemoryDump* pmd, | |
31 const trace_event::MemoryAllocatorDumpGuid& source, | |
32 const base::SharedMemoryHandle& shared_memory_handle, | |
33 size_t mapped_size); | |
34 | |
35 // base::trace_event::MemoryDumpProvider implementation. | |
36 bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args, | |
37 base::trace_event::ProcessMemoryDump* pmd) override; | |
38 | |
39 bool IncrementMemoryUsage(const SharedMemory& shared_memory); | |
40 bool DecrementMemoryUsage(const SharedMemory& shared_memory); | |
41 | |
42 private: | |
43 struct TrackerBucket { | |
44 TrackerBucket(); | |
45 ~TrackerBucket(); | |
46 base::Lock lock; | |
47 // The first map's key is a device ID and the second map's key is a file | |
48 // ID. See SharedMemoryHandleID struct. | |
49 std::unordered_map<int64_t, std::unordered_map<int64_t, size_t>> usage; | |
Primiano Tucci (use gerrit)
2017/01/20 16:34:52
I don't think you should expose device id and file
hajimehoshi
2017/01/23 11:59:09
Done.
| |
50 }; | |
51 | |
52 friend struct base::DefaultSingletonTraits<SharedMemoryTracker>; | |
53 | |
54 static const int kTrackerBucketNum = 1024; | |
55 | |
56 SharedMemoryTracker(); | |
57 ~SharedMemoryTracker() override; | |
58 | |
59 TrackerBucket buckets_[kTrackerBucketNum]; | |
60 | |
61 DISALLOW_COPY_AND_ASSIGN(SharedMemoryTracker); | |
62 }; | |
63 | |
64 } // namespace base | |
65 | |
66 #endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ | |
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