Index: base/debug/trace_event_system_stats_monitor.h |
diff --git a/base/debug/trace_event_system_stats_monitor.h b/base/debug/trace_event_system_stats_monitor.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..1a8b3288e64ed383c72c76fc1e93230e40685412 |
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+++ b/base/debug/trace_event_system_stats_monitor.h |
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+// Copyright 2013 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_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ |
+#define BASE_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ |
+ |
+#include "base/base_export.h" |
+#include "base/debug/trace_event_impl.h" |
+#include "base/gtest_prod_util.h" |
+#include "base/memory/ref_counted.h" |
+#include "base/memory/weak_ptr.h" |
+#include "base/process/process_metrics.h" |
+#include "base/timer/timer.h" |
+ |
+namespace base { |
+ |
+class SingleThreadTaskRunner; |
+ |
+namespace debug { |
+ |
+// Watches for chrome://tracing to be enabled or disabled. When tracing is |
+// enabled, also enables system events profiling. This class is the preferred |
+// way to turn system tracing on and off. |
+class BASE_EXPORT TraceEventSystemStatsMonitor |
+ : public TraceLog::EnabledStateObserver { |
+ public: |
+ // Length of time interval between stat profiles. |
+ static const int kSamplingIntervalMilliseconds = 2000; |
+ |
+ // |task_runner| must be the primary thread for the client |
+ // process, e.g. the UI thread in a browser. |
+ explicit TraceEventSystemStatsMonitor( |
+ scoped_refptr<SingleThreadTaskRunner> task_runner); |
+ |
+ virtual ~TraceEventSystemStatsMonitor(); |
+ |
+ // base::debug::TraceLog::EnabledStateChangedObserver overrides: |
+ virtual void OnTraceLogEnabled() OVERRIDE; |
+ virtual void OnTraceLogDisabled() OVERRIDE; |
+ |
+ // Retrieves system profiling at the current time. |
+ void DumpSystemStats(); |
+ |
+ private: |
+ FRIEND_TEST_ALL_PREFIXES(TraceSystemStatsMonitorTest, |
+ TraceEventSystemStatsMonitor); |
+ |
+ bool IsTimerRunningForTest() const; |
+ |
+ void StartProfiling(); |
+ |
+ void StopProfiling(); |
+ |
+ // Ensures the observer starts and stops tracing on the primary thread. |
+ scoped_refptr<SingleThreadTaskRunner> task_runner_; |
+ |
+ // Timer to schedule system profile dumps. |
+ RepeatingTimer<TraceEventSystemStatsMonitor> dump_timer_; |
+ |
+ WeakPtrFactory<TraceEventSystemStatsMonitor> weak_factory_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(TraceEventSystemStatsMonitor); |
+}; |
+ |
+// Converts system memory profiling stats in |input| to |
+// trace event compatible JSON and appends to |output|. Visible for testing. |
+BASE_EXPORT void AppendSystemProfileAsTraceFormat(const SystemMetrics& |
+ system_stats, |
+ std::string* output); |
+ |
+} // namespace debug |
+} // namespace base |
+ |
+#endif // BASE_DEBUG_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ |