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// Copyright (c) 2012 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 CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
#define CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
#include <map>
#include "base/process/process_handle.h"
#include "base/timer/timer.h"
#include "chrome/browser/performance_monitor/process_metrics_history.h"
template <typename Type>
struct DefaultSingletonTraits;
namespace content {
struct ChildProcessData;
}
namespace performance_monitor {
// PerformanceMonitor is a tool which periodically monitors performance metrics
// for histogram logging and possibly taking action upon noticing serious
// performance degradation.
class PerformanceMonitor {
public:
// Returns the current PerformanceMonitor instance if one exists; otherwise
// constructs a new PerformanceMonitor.
static PerformanceMonitor* GetInstance();
// Start the cycle of metrics gathering.
void StartGatherCycle();
private:
typedef std::map<base::ProcessHandle, ProcessMetricsHistory> MetricsMap;
friend struct DefaultSingletonTraits<PerformanceMonitor>;
PerformanceMonitor();
virtual ~PerformanceMonitor();
// Perform any collections that are done on a timed basis.
void DoTimedCollections();
// Mark the given process as alive in the current update iteration.
// This means adding an entry to the map of watched processes if it's not
// already present.
void MarkProcessAsAlive(const ProcessMetricsMetadata& process_data,
int current_update_sequence);
// Updates the ProcessMetrics map with the current list of processes and
// gathers metrics from each entry.
void GatherMetricsMapOnUIThread();
void GatherMetricsMapOnIOThread(int current_update_sequence);
// A map of currently running ProcessHandles to ProcessMetrics.
MetricsMap metrics_map_;
// The timer to signal PerformanceMonitor to perform its timed collections.
base::RepeatingTimer<PerformanceMonitor> repeating_timer_;
DISALLOW_COPY_AND_ASSIGN(PerformanceMonitor);
};
} // namespace performance_monitor
#endif // CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
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