chrome/browser/performance_monitor/process_metrics_history.h

   1 // Copyright 2013 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_PROCESS_METRICS_HISTORY_H_
   6 #define CHROME_BROWSER_PERFORMANCE_MONITOR_PROCESS_METRICS_HISTORY_H_
   7
   8 #include "base/memory/linked_ptr.h"
   9 #include "base/process/process_handle.h"
  10
  11 namespace base {
  12 class ProcessMetrics;
  13 }
  14
  15 namespace performance_monitor {
  16
  17 class ProcessMetricsHistory {
  18  public:
  19   ProcessMetricsHistory();
  20   ~ProcessMetricsHistory();
  21
  22   // Configure this to monitor a specific process.
  23   void Initialize(base::ProcessHandle process_handle,
  24                   int process_type,
  25                   int initial_update_sequence);
  26
  27   // End of a measurement cycle; check for performance issues and reset
  28   // accumulated statistics.
  29   void EndOfCycle();
  30
  31   // Gather metrics for the process and accumulate with past data.
  32   void SampleMetrics();
  33
  34   // Used to mark when this object was last updated, so we can cull
  35   // dead ones.
  36   void set_last_update_sequence(int new_update_sequence) {
  37     last_update_sequence_ = new_update_sequence;
  38   }
  39
  40   int last_update_sequence() const { return last_update_sequence_; }
  41
  42   // Average CPU over all the past sampling points since last reset.
  43   double GetAverageCPUUsage() const {
  44     return accumulated_cpu_usage_ / sample_count_;
  45   }
  46
  47   // Average mem usage over all the past sampling points since last reset.
  48   void GetAverageMemoryBytes(size_t* private_bytes,
  49                              size_t* shared_bytes) const {
  50     *private_bytes = accumulated_private_bytes_ / sample_count_;
  51     *shared_bytes = accumulated_shared_bytes_ / sample_count_;
  52   }
  53
  54  private:
  55   void ResetCounters();
  56   void RunPerformanceTriggers();
  57
  58   base::ProcessHandle process_handle_;
  59   int process_type_;
  60   linked_ptr<base::ProcessMetrics> process_metrics_;
  61   int last_update_sequence_;
  62
  63   double accumulated_cpu_usage_;
  64   double min_cpu_usage_;
  65   size_t accumulated_private_bytes_;
  66   size_t accumulated_shared_bytes_;
  67   int sample_count_;
  68 };
  69
  70 }  // namespace performance_monitor
  71
  72 #endif  // CHROME_BROWSER_PERFORMANCE_MONITOR_PROCESS_METRICS_HISTORY_H_