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| 1 // Copyright 2013 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_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ |
| 6 #define BASE_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ |
| 7 |
| 8 #include "base/base_export.h" |
| 9 #include "base/debug/trace_event_impl.h" |
| 10 #include "base/gtest_prod_util.h" |
| 11 #include "base/memory/ref_counted.h" |
| 12 #include "base/memory/weak_ptr.h" |
| 13 #include "base/process/process_metrics.h" |
| 14 #include "base/timer/timer.h" |
| 15 |
| 16 namespace base { |
| 17 |
| 18 class SingleThreadTaskRunner; |
| 19 |
| 20 namespace debug { |
| 21 |
| 22 // Watches for chrome://tracing to be enabled or disabled. When tracing is |
| 23 // enabled, also enables system events profiling. This class is the preferred |
| 24 // way to turn system tracing on and off. |
| 25 class BASE_EXPORT TraceEventSystemStatsMonitor |
| 26 : public TraceLog::EnabledStateObserver { |
| 27 public: |
| 28 // Length of time interval between stat profiles. |
| 29 static const int kSamplingIntervalMilliseconds = 2000; |
| 30 |
| 31 // |task_runner| must be the primary thread for the client |
| 32 // process, e.g. the UI thread in a browser. |
| 33 explicit TraceEventSystemStatsMonitor( |
| 34 scoped_refptr<SingleThreadTaskRunner> task_runner); |
| 35 |
| 36 virtual ~TraceEventSystemStatsMonitor(); |
| 37 |
| 38 // base::debug::TraceLog::EnabledStateChangedObserver overrides: |
| 39 virtual void OnTraceLogEnabled() OVERRIDE; |
| 40 virtual void OnTraceLogDisabled() OVERRIDE; |
| 41 |
| 42 // Retrieves system profiling at the current time. |
| 43 void DumpSystemStats(); |
| 44 |
| 45 private: |
| 46 FRIEND_TEST_ALL_PREFIXES(TraceSystemStatsMonitorTest, |
| 47 TraceEventSystemStatsMonitor); |
| 48 |
| 49 bool IsTimerRunningForTest() const; |
| 50 |
| 51 void StartProfiling(); |
| 52 |
| 53 void StopProfiling(); |
| 54 |
| 55 // Ensures the observer starts and stops tracing on the primary thread. |
| 56 scoped_refptr<SingleThreadTaskRunner> task_runner_; |
| 57 |
| 58 // Timer to schedule system profile dumps. |
| 59 RepeatingTimer<TraceEventSystemStatsMonitor> dump_timer_; |
| 60 |
| 61 WeakPtrFactory<TraceEventSystemStatsMonitor> weak_factory_; |
| 62 |
| 63 DISALLOW_COPY_AND_ASSIGN(TraceEventSystemStatsMonitor); |
| 64 }; |
| 65 |
| 66 // Converts system memory profiling stats in |input| to |
| 67 // trace event compatible JSON and appends to |output|. Visible for testing. |
| 68 BASE_EXPORT void AppendSystemProfileAsTraceFormat(const SystemMetrics& |
| 69 system_stats, |
| 70 std::string* output); |
| 71 |
| 72 } // namespace debug |
| 73 } // namespace base |
| 74 |
| 75 #endif // BASE_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ |
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