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 #include <vector>
  10
  11 #include "base/process/process_handle.h"
  12 #include "base/timer/timer.h"
  13 #include "chrome/browser/performance_monitor/process_metrics_history.h"
  14
  15 template <typename Type>
  16 struct DefaultSingletonTraits;
  17
  18 namespace content {
  19 struct ChildProcessData;
  20 }
  21
  22 namespace performance_monitor {
  23
  24 // PerformanceMonitor is a tool which periodically monitors performance metrics
  25 // for histogram logging and possibly taking action upon noticing serious
  26 // performance degradation.
  27 class PerformanceMonitor {
  28  public:
  29   // Returns the current PerformanceMonitor instance if one exists; otherwise
  30   // constructs a new PerformanceMonitor.
  31   static PerformanceMonitor* GetInstance();
  32
  33   // Start the cycle of metrics gathering.
  34   void StartGatherCycle();
  35
  36  private:
  37   typedef std::map<base::ProcessHandle, ProcessMetricsHistory> MetricsMap;
  38
  39   friend struct DefaultSingletonTraits<PerformanceMonitor>;
  40
  41   PerformanceMonitor();
  42   virtual ~PerformanceMonitor();
  43
  44   // Perform any collections that are done on a timed basis.
  45   void DoTimedCollections();
  46
  47   // Mark the given process as alive in the current update iteration.
  48   // This means adding an entry to the map of watched processes if it's not
  49   // already present.
  50   void MarkProcessAsAlive(const ProcessMetricsMetadata& process_data,
  51                           int current_update_sequence);
  52   void MarkProcessesAsAliveOnUIThread(
  53       scoped_ptr<std::vector<ProcessMetricsMetadata>> process_data_list,
  54       int current_update_sequence);
  55
  56   // Updates the ProcessMetrics map with the current list of processes and
  57   // gathers metrics from each entry.
  58   void GatherMetricsMapOnUIThread();
  59   void GatherMetricsMapOnIOThread(int current_update_sequence);
  60
  61   void UpdateMetricsOnIOThread(int current_update_sequence);
  62   void RunTriggersUIThread();
  63
  64   // A map of currently running ProcessHandles to ProcessMetrics.
  65   MetricsMap metrics_map_;
  66
  67   // The timer to signal PerformanceMonitor to perform its timed collections.
  68   base::OneShotTimer<PerformanceMonitor> repeating_timer_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(PerformanceMonitor);
  71 };
  72
  73 }  // namespace performance_monitor
  74
  75 #endif  // CHROME_BROWSER_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_H_