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91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MEMORY_SHARED_MEMORY_TRACKER_H_
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#define BASE_MEMORY_SHARED_MEMORY_TRACKER_H_
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#include <map>
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#include <string>
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#include "base/memory/shared_memory.h"
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#include "base/memory/shared_memory_mapping.h"
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#include "base/synchronization/lock.h"
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#include "base/trace_event/memory_dump_provider.h"
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namespace base {
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namespace trace_event {
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class MemoryAllocatorDump;
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class MemoryAllocatorDumpGuid;
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class ProcessMemoryDump;
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}
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// SharedMemoryTracker tracks shared memory usage.
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class BASE_EXPORT SharedMemoryTracker : public trace_event::MemoryDumpProvider {
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public:
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// Returns a singleton instance.
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static SharedMemoryTracker* GetInstance();
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static std::string GetDumpNameForTracing(const UnguessableToken& id);
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static trace_event::MemoryAllocatorDumpGuid GetGlobalDumpIdForTracing(
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const UnguessableToken& id);
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// Gets or creates if non-existant, a memory dump for the |shared_memory|
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// inside the given |pmd|. Also adds the necessary edges for the dump when
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// creating the dump.
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static const trace_event::MemoryAllocatorDump* GetOrCreateSharedMemoryDump(
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const SharedMemory* shared_memory,
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trace_event::ProcessMemoryDump* pmd);
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// We're in the middle of a refactor https://crbug.com/795291. Eventually, the
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// first call will go away.
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static const trace_event::MemoryAllocatorDump* GetOrCreateSharedMemoryDump(
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const SharedMemoryMapping& shared_memory,
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trace_event::ProcessMemoryDump* pmd);
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// Records shared memory usage on valid mapping.
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void IncrementMemoryUsage(const SharedMemory& shared_memory);
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void IncrementMemoryUsage(const SharedMemoryMapping& mapping);
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// Records shared memory usage on unmapping.
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void DecrementMemoryUsage(const SharedMemory& shared_memory);
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void DecrementMemoryUsage(const SharedMemoryMapping& mapping);
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// Root dump name for all shared memory dumps.
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static const char kDumpRootName[];
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private:
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SharedMemoryTracker();
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~SharedMemoryTracker() override;
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// trace_event::MemoryDumpProvider implementation.
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bool OnMemoryDump(const trace_event::MemoryDumpArgs& args,
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trace_event::ProcessMemoryDump* pmd) override;
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static const trace_event::MemoryAllocatorDump*
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GetOrCreateSharedMemoryDumpInternal(void* mapped_memory,
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size_t mapped_size,
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const UnguessableToken& mapped_id,
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trace_event::ProcessMemoryDump* pmd);
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// Information associated with each mapped address.
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struct UsageInfo {
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UsageInfo(size_t size, const UnguessableToken& id)
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: mapped_size(size), mapped_id(id) {}
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size_t mapped_size;
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UnguessableToken mapped_id;
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};
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// Used to lock when |usages_| is modified or read.
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Lock usages_lock_;
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std::map<void*, UsageInfo> usages_;
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DISALLOW_COPY_AND_ASSIGN(SharedMemoryTracker);
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};
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} // namespace base
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#endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_
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