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118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
// Copyright 2018 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_SAMPLING_HEAP_PROFILER_SAMPLING_HEAP_PROFILER_H_
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#define BASE_SAMPLING_HEAP_PROFILER_SAMPLING_HEAP_PROFILER_H_
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#include <memory>
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#include <stack>
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#include <unordered_map>
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#include <vector>
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/synchronization/lock.h"
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#include "base/threading/thread_local.h"
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namespace base {
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template <typename T>
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class NoDestructor;
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// The class implements sampling profiling of native memory heap.
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// It hooks on base::allocator and base::PartitionAlloc.
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// When started it selects and records allocation samples based on
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// the sampling_interval parameter.
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// The recorded samples can then be retrieved using GetSamples method.
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class BASE_EXPORT SamplingHeapProfiler {
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public:
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class BASE_EXPORT Sample {
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public:
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Sample(const Sample&);
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~Sample();
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size_t size; // Allocation size.
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size_t total; // Total size attributed to the sample.
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std::vector<void*> stack;
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private:
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friend class SamplingHeapProfiler;
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Sample(size_t, size_t total, uint32_t ordinal);
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uint32_t ordinal;
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};
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class SamplesObserver {
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public:
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virtual ~SamplesObserver() = default;
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virtual void SampleAdded(uint32_t id, size_t size, size_t total) = 0;
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virtual void SampleRemoved(uint32_t id) = 0;
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};
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// Must be called early during the process initialization. It creates and
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// reserves a TLS slot.
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static void InitTLSSlot();
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// This is an entry point for plugging in an external allocator.
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// Profiler will invoke the provided callback upon initialization.
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// The callback should install hooks onto the corresponding memory allocator
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// and make them invoke SamplingHeapProfiler::RecordAlloc and
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// SamplingHeapProfiler::RecordFree upon corresponding allocation events.
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//
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// If the method is called after profiler is initialized, the callback
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// is invoked right away.
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static void SetHooksInstallCallback(void (*hooks_install_callback)());
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void AddSamplesObserver(SamplesObserver*);
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void RemoveSamplesObserver(SamplesObserver*);
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uint32_t Start();
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void Stop();
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void SetSamplingInterval(size_t sampling_interval);
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void SuppressRandomnessForTest(bool suppress);
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std::vector<Sample> GetSamples(uint32_t profile_id);
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static void RecordAlloc(void* address, size_t, uint32_t skip_frames = 0);
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static void RecordFree(void* address);
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static SamplingHeapProfiler* GetInstance();
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private:
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using SamplesMap = std::unordered_map<void*, Sample>;
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SamplingHeapProfiler();
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~SamplingHeapProfiler() = delete;
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static void InstallAllocatorHooksOnce();
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static bool InstallAllocatorHooks();
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static size_t GetNextSampleInterval(size_t base_interval);
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void DoRecordAlloc(size_t total_allocated,
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size_t allocation_size,
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void* address,
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uint32_t skip_frames);
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void DoRecordFree(void* address);
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void RecordStackTrace(Sample*, uint32_t skip_frames);
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SamplesMap& EnsureNoRehashingMap();
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static SamplesMap& samples();
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base::ThreadLocalBoolean entered_;
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base::Lock mutex_;
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std::stack<std::unique_ptr<SamplesMap>> sample_maps_;
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std::vector<SamplesObserver*> observers_;
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uint32_t last_sample_ordinal_ = 0;
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static SamplingHeapProfiler* instance_;
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friend class base::NoDestructor<SamplingHeapProfiler>;
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DISALLOW_COPY_AND_ASSIGN(SamplingHeapProfiler);
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};
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} // namespace base
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#endif // BASE_SAMPLING_HEAP_PROFILER_SAMPLING_HEAP_PROFILER_H_
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