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| 1 // Copyright 2015 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_PROFILER_CPU_PROFILER_H_ |
| 6 #define BASE_PROFILER_CPU_PROFILER_H_ |
| 7 |
| 8 #include <map> |
| 9 |
| 10 #include "base/base_export.h" |
| 11 #include "base/memory/scoped_ptr.h" |
| 12 #include "base/strings/string16.h" |
| 13 #include "base/synchronization/waitable_event.h" |
| 14 #include "base/timer/timer.h" |
| 15 |
| 16 namespace base { |
| 17 |
| 18 #if defined(OS_WIN) |
| 19 struct StackTraceEntry { |
| 20 DWORD64 rsp; |
| 21 DWORD64 rip; |
| 22 HMODULE module; |
| 23 }; |
| 24 #endif |
| 25 |
| 26 // CpuProfiler is a prototype of a technique that periodically stops the main |
| 27 // thread to samples its stack. It does not do anything useful with the |
| 28 // collected information yet; this implementation is for the purposes of |
| 29 // determining perf impact of the profiler itself. |
| 30 // |
| 31 // Currently, this is intended to sample the main thread. It should be allocated |
| 32 // on that thread, then Initialize should be called to start the sampling, and |
| 33 // Stop called to stop the sampling. |
| 34 class BASE_EXPORT CpuProfiler { |
| 35 public: |
| 36 CpuProfiler(); |
| 37 ~CpuProfiler(); |
| 38 |
| 39 void Initialize(const std::map<std::string, std::string>* params); |
| 40 void Stop(); |
| 41 |
| 42 std::string GetStringParam(const std::string& key) const; |
| 43 int GetIntParam(const std::string& key) const; |
| 44 int64 GetInt64Param(const std::string& key) const; |
| 45 |
| 46 private: |
| 47 class SamplingThread; |
| 48 struct SamplingThreadDeleter { |
| 49 void operator() (SamplingThread* thread) const; |
| 50 }; |
| 51 |
| 52 static bool IsPlatformSupported(); |
| 53 |
| 54 void SetParams(const std::map<std::string, std::string>& params); |
| 55 |
| 56 void OnTimer(); |
| 57 |
| 58 #if defined(OS_WIN) |
| 59 void ProcessStack(StackTraceEntry* stack, int stack_depth); |
| 60 |
| 61 HANDLE main_thread_; |
| 62 int main_thread_stack_depth_; |
| 63 StackTraceEntry main_thread_stack_[64]; |
| 64 |
| 65 std::map<HMODULE, base::string16> modules_; |
| 66 #endif |
| 67 |
| 68 std::map<std::string, std::string> params_; |
| 69 |
| 70 scoped_ptr<SamplingThread, SamplingThreadDeleter> sampling_thread_; |
| 71 PlatformThreadHandle sampling_thread_handle_; |
| 72 |
| 73 DISALLOW_COPY_AND_ASSIGN(CpuProfiler); |
| 74 }; |
| 75 |
| 76 } // namespace base |
| 77 |
| 78 #endif // BASE_PROFILER_CPU_PROFILER_H_ |
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