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Side by Side Diff: base/chromeos/memory_pressure_observer_chromeos.h

Issue 1045433002: Migrate ChromeOS to base::MemoryPressureMonitor (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: review comments Created 5 years, 8 months ago
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1 // Copyright 2014 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 BASE_CHROMEOS_MEMORY_PRESSURE_OBSERVER_CHROMEOS_H_
6 #define BASE_CHROMEOS_MEMORY_PRESSURE_OBSERVER_CHROMEOS_H_
7
8 #include "base/base_export.h"
9 #include "base/gtest_prod_util.h"
10 #include "base/macros.h"
11 #include "base/memory/memory_pressure_listener.h"
12 #include "base/memory/weak_ptr.h"
13 #include "base/timer/timer.h"
14
15 namespace base {
16
17 class TestMemoryPressureObserver;
18
19 ////////////////////////////////////////////////////////////////////////////////
20 // MemoryPressureObserverChromeOS
21 //
22 // A class to handle the observation of our free memory. It notifies the
23 // MemoryPressureListener of memory fill level changes, so that it can take
24 // action to reduce memory resources accordingly.
25 //
26 class BASE_EXPORT MemoryPressureObserverChromeOS {
27 public:
28 using GetUsedMemoryInPercentCallback = int (*)();
29
30 // There are two memory pressure events:
31 // MODERATE - which will mainly release caches.
32 // CRITICAL - which will discard tabs.
33 // The |MemoryPressureThresholds| enum selects the strategy of firing these
34 // events: A conservative strategy will keep as much content in memory as
35 // possible (causing the system to swap to zram) and an aggressive strategy
36 // will release memory earlier to avoid swapping.
37 enum MemoryPressureThresholds {
38 // Use the system default.
39 THRESHOLD_DEFAULT = 0,
40 // Try to keep as much content in memory as possible.
41 THRESHOLD_CONSERVATIVE = 1,
42 // Discard caches earlier, allowing to keep more tabs in memory.
43 THRESHOLD_AGGRESSIVE_CACHE_DISCARD = 2,
44 // Discard tabs earlier, allowing the system to get faster.
45 THRESHOLD_AGGRESSIVE_TAB_DISCARD = 3,
46 // Discard caches and tabs earlier to allow the system to be faster.
47 THRESHOLD_AGGRESSIVE = 4
48 };
49
50 explicit MemoryPressureObserverChromeOS(MemoryPressureThresholds thresholds);
51 virtual ~MemoryPressureObserverChromeOS();
52
53 // Redo the memory pressure calculation soon and call again if a critical
54 // memory pressure prevails. Note that this call will trigger an asynchronous
55 // action which gives the system time to release memory back into the pool.
56 void ScheduleEarlyCheck();
57
58 // Get the current memory pressure level.
59 base::MemoryPressureListener::MemoryPressureLevel GetCurrentPressureLevel() {
60 return current_memory_pressure_level_;
61 }
62
63 private:
64 friend TestMemoryPressureObserver;
65 // Starts observing the memory fill level.
66 // Calls to StartObserving should always be matched with calls to
67 // StopObserving.
68 void StartObserving();
69
70 // Stop observing the memory fill level.
71 // May be safely called if StartObserving has not been called.
72 void StopObserving();
73
74 // The function which gets periodically called to check any changes in the
75 // memory pressure. It will report pressure changes as well as continuous
76 // critical pressure levels.
77 void CheckMemoryPressure();
78
79 // The function periodically checks the memory pressure changes and records
80 // the UMA histogram statistics for the current memory pressure level.
81 void CheckMemoryPressureAndRecordStatistics();
82
83 // Get the memory pressure in percent (virtual for testing).
84 virtual int GetUsedMemoryInPercent();
85
86 // The current memory pressure.
87 base::MemoryPressureListener::MemoryPressureLevel
88 current_memory_pressure_level_;
89
90 // A periodic timer to check for resource pressure changes. This will get
91 // replaced by a kernel triggered event system (see crbug.com/381196).
92 base::RepeatingTimer<MemoryPressureObserverChromeOS> timer_;
93
94 // To slow down the amount of moderate pressure event calls, this counter
95 // gets used to count the number of events since the last event occured.
96 int moderate_pressure_repeat_count_;
97
98 // The thresholds for moderate and critical pressure.
99 const int moderate_pressure_threshold_percent_;
100 const int critical_pressure_threshold_percent_;
101
102 base::WeakPtrFactory<MemoryPressureObserverChromeOS> weak_ptr_factory_;
103
104 DISALLOW_COPY_AND_ASSIGN(MemoryPressureObserverChromeOS);
105 };
106
107 } // namespace base
108
109 #endif // BASE_CHROMEOS_MEMORY_PRESSURE_OBSERVER_CHROMEOS_H_
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