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