chrome/browser/metrics/metrics_memory_details.h

   1 // Copyright 2015 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_METRICS_METRICS_MEMORY_DETAILS_H_
   6 #define CHROME_BROWSER_METRICS_METRICS_MEMORY_DETAILS_H_
   7
   8 #include <map>
   9
  10 #include "base/callback.h"
  11 #include "chrome/browser/memory_details.h"
  12
  13 // MemoryGrowthTracker tracks latest metrics about record time and memory usage
  14 // at that time per process.
  15 class MemoryGrowthTracker {
  16  public:
  17   MemoryGrowthTracker();
  18   ~MemoryGrowthTracker();
  19
  20   // If 30 minutes have passed since last UMA record, UpdateSample() computes
  21   // a difference between current memory usage |sample| of process |pid| and
  22   // stored memory usage at the time of last UMA record. Then, it updates the
  23   // stored memory usage to |sample|, stores the difference in |diff| and
  24   // returns true.
  25   // If no memory usage of |pid| has not been recorded so far or 30 minutes
  26   // have not passed since last record, it just returns false.
  27   // |sample| is memory usage in kB.
  28   bool UpdateSample(base::ProcessId pid, int sample, int* diff);
  29
  30  private:
  31   // Latest metrics about record time and memory usage at that time per process.
  32   // The second values of |memory_sizes_| are in kB.
  33   std::map<base::ProcessId, base::TimeTicks> times_;
  34   std::map<base::ProcessId, int> memory_sizes_;
  35
  36   DISALLOW_COPY_AND_ASSIGN(MemoryGrowthTracker);
  37 };
  38
  39 // Handles asynchronous fetching of memory details and logging histograms about
  40 // memory use of various processes.
  41 // Will run the provided callback when finished.
  42 class MetricsMemoryDetails : public MemoryDetails {
  43  public:
  44   MetricsMemoryDetails(const base::Closure& callback,
  45                        MemoryGrowthTracker* memory_growth_tracker);
  46
  47  protected:
  48   ~MetricsMemoryDetails() override;
  49
  50   // MemoryDetails:
  51   void OnDetailsAvailable() override;
  52
  53  private:
  54   // Updates the global histograms for tracking memory usage.
  55   void UpdateHistograms();
  56
  57 #if defined(OS_CHROMEOS)
  58   void UpdateSwapHistograms();
  59 #endif
  60
  61   base::Closure callback_;
  62
  63   // A pointer to MemoryGrowthTracker which is contained in a longer-lived
  64   // owner of MetricsMemoryDetails, for example, ChromeMetricsServiceClient.
  65   // If it is null, nothing is tracked.
  66   MemoryGrowthTracker* memory_growth_tracker_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(MetricsMemoryDetails);
  69 };
  70
  71 #endif  // CHROME_BROWSER_METRICS_METRICS_MEMORY_DETAILS_H_