Home | History | Annotate | Download | only in performance_monitor 
      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_
     73