chrome/browser/performance_monitor/performance_monitor.h

   1 // Copyright (c) 2012 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 CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
   6 #define CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_
   7
   8 #include <map>
   9
  10 #include "base/process/process_handle.h"
  11 #include "base/timer/timer.h"
  12 #include "chrome/browser/performance_monitor/process_metrics_history.h"
  13
  14 template <typename Type>
  15 struct DefaultSingletonTraits;
  16
  17 namespace content {
  18 struct ChildProcessData;
  19 }
  20
  21 namespace performance_monitor {
  22
  23 // PerformanceMonitor is a tool which periodically monitors performance metrics
  24 // for histogram logging and possibly taking action upon noticing serious
  25 // performance degradation.
  26 class PerformanceMonitor {
  27  public:
  28   // Returns the current PerformanceMonitor instance if one exists; otherwise
  29   // constructs a new PerformanceMonitor.
  30   static PerformanceMonitor* GetInstance();
  31
  32   // Start the cycle of metrics gathering.
  33   void StartGatherCycle();
  34
  35  private:
  36   typedef std::map<base::ProcessHandle, ProcessMetricsHistory> MetricsMap;
  37
  38   friend struct DefaultSingletonTraits<PerformanceMonitor>;
  39
  40   PerformanceMonitor();
  41   virtual ~PerformanceMonitor();
  42
  43   // Perform any collections that are done on a timed basis.
  44   void DoTimedCollections();
  45
  46   // Mark the given process as alive in the current update iteration.
  47   // This means adding an entry to the map of watched processes if it's not
  48   // already present.
  49   void MarkProcessAsAlive(const ProcessMetricsMetadata& process_data,
  50                           int current_update_sequence);
  51
  52   // Updates the ProcessMetrics map with the current list of processes and
  53   // gathers metrics from each entry.
  54   void GatherMetricsMapOnUIThread();
  55   void GatherMetricsMapOnIOThread(int current_update_sequence);
  56
  57   // A map of currently running ProcessHandles to ProcessMetrics.
  58   MetricsMap metrics_map_;
  59
  60   // The timer to signal PerformanceMonitor to perform its timed collections.
  61   base::RepeatingTimer<PerformanceMonitor> repeating_timer_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(PerformanceMonitor);
  64 };
  65
  66 }  // namespace performance_monitor
  67
  68 #endif  // CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_