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Diffstat (limited to 'chromium/base/trace_event/trace_event_system_stats_monitor.h')
-rw-r--r-- | chromium/base/trace_event/trace_event_system_stats_monitor.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/chromium/base/trace_event/trace_event_system_stats_monitor.h b/chromium/base/trace_event/trace_event_system_stats_monitor.h new file mode 100644 index 00000000000..051669a35f5 --- /dev/null +++ b/chromium/base/trace_event/trace_event_system_stats_monitor.h @@ -0,0 +1,75 @@ +// 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_TRACE_EVENT_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ +#define BASE_TRACE_EVENT_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ + +#include "base/base_export.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" +#include "base/trace_event/trace_event_impl.h" + +namespace base { + +class SingleThreadTaskRunner; + +namespace trace_event { + +// 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::trace_event::TraceLog::EnabledStateChangedObserver overrides: + void OnTraceLogEnabled() override; + 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 trace_event +} // namespace base + +#endif // BASE_TRACE_EVENT_TRACE_EVENT_SYSTEM_STATS_MONITOR_H_ |