Index: base/profiler/cpu_profiler.h |
diff --git a/base/profiler/cpu_profiler.h b/base/profiler/cpu_profiler.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c24d7d60cf7b0e61ca2050a3c015287db75214ed |
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+++ b/base/profiler/cpu_profiler.h |
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+// Copyright 2015 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef BASE_PROFILER_CPU_PROFILER_H_ |
+#define BASE_PROFILER_CPU_PROFILER_H_ |
+ |
+#include <map> |
+ |
+#include "base/base_export.h" |
+#include "base/memory/scoped_ptr.h" |
+#include "base/strings/string16.h" |
+#include "base/synchronization/waitable_event.h" |
+#include "base/timer/timer.h" |
+ |
+namespace base { |
+ |
+#if defined(OS_WIN) |
+struct StackTraceEntry { |
+ DWORD64 rsp; |
+ DWORD64 rip; |
+ HMODULE module; |
+}; |
+#endif |
+ |
+// CpuProfiler is a prototype of a technique that periodically stops the main |
+// thread to samples its stack. It does not do anything useful with the |
+// collected information yet; this implementation is for the purposes of |
+// determining perf impact of the profiler itself. |
+// |
+// Currently, this is intended to sample the main thread. It should be allocated |
+// on that thread, then Initialize should be called to start the sampling, and |
+// Stop called to stop the sampling. |
+class BASE_EXPORT CpuProfiler { |
+ public: |
+ CpuProfiler(); |
+ ~CpuProfiler(); |
+ |
+ void Initialize(const std::map<std::string, std::string>* params); |
+ void Stop(); |
+ |
+ std::string GetStringParam(const std::string& key) const; |
+ int GetIntParam(const std::string& key) const; |
+ int64 GetInt64Param(const std::string& key) const; |
+ |
+ private: |
+ class SamplingThread; |
+ struct SamplingThreadDeleter { |
+ void operator() (SamplingThread* thread) const; |
+ }; |
+ |
+ static bool IsPlatformSupported(); |
+ |
+ void SetParams(const std::map<std::string, std::string>& params); |
+ |
+ void OnTimer(); |
+ |
+#if defined(OS_WIN) |
+ void ProcessStack(StackTraceEntry* stack, int stack_depth); |
+ |
+ HANDLE main_thread_; |
+ int main_thread_stack_depth_; |
+ StackTraceEntry main_thread_stack_[64]; |
+ |
+ std::map<HMODULE, base::string16> modules_; |
+#endif |
+ |
+ std::map<std::string, std::string> params_; |
+ |
+ scoped_ptr<SamplingThread, SamplingThreadDeleter> sampling_thread_; |
+ PlatformThreadHandle sampling_thread_handle_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(CpuProfiler); |
+}; |
+ |
+} // namespace base |
+ |
+#endif // BASE_PROFILER_CPU_PROFILER_H_ |