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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 CONTENT_BROWSER_MEMORY_MEMORY_PRESSURE_CONTROLLER_IMPL_H_ | |
6 #define CONTENT_BROWSER_MEMORY_MEMORY_PRESSURE_CONTROLLER_IMPL_H_ | |
7 | |
8 #include <map> | |
9 | |
10 #include "base/callback.h" | |
11 #include "base/macros.h" | |
12 #include "base/memory/memory_pressure_listener.h" | |
13 #include "base/memory/singleton.h" | |
14 #include "content/common/content_export.h" | |
15 | |
16 namespace content { | |
17 | |
18 class BrowserChildProcessHost; | |
19 class MemoryMessageFilter; | |
20 class RenderProcessHost; | |
21 | |
22 // Controller for memory pressure IPC messages. Each child process owns and | |
23 // registers a MemoryMessageFilter, which can be used to both suppress and | |
24 // simulate memory pressure messages across processes. This controller | |
25 // coordinates suppressing and simulation of messages, as well as allows for | |
26 // messages to be forwarded to individual processes. This allows the browser | |
27 // process to control what memory pressure messages are seen in child processes. | |
28 // For more details see content/browser/memory/memory_message_filter.h and | |
29 // content/child/memory/child_memory_message_filter.h. | |
30 class CONTENT_EXPORT MemoryPressureControllerImpl { | |
31 public: | |
32 // This method can be called from any thread. | |
33 static MemoryPressureControllerImpl* GetInstance(); | |
34 | |
35 // These methods must be called on the IO thread. | |
36 void OnMemoryMessageFilterAdded(MemoryMessageFilter* filter); | |
37 void OnMemoryMessageFilterRemoved(MemoryMessageFilter* filter); | |
38 | |
39 // These methods can be called from any thread. | |
40 | |
41 // Suppresses all memory pressure messages from passing through all attached | |
42 // MemoryMessageFilters. Any messages sent through a "suppressed" filter will | |
43 // be ignored on the receiving end. | |
44 void SetPressureNotificationsSuppressedInAllProcesses(bool suppressed); | |
45 | |
46 // Simulates memory pressure in all processes by invoking | |
47 // SimulatePressureNotification on all attached MemoryMessageFilters. These | |
48 // messages will be received even if suppression is enabled. | |
49 void SimulatePressureNotificationInAllProcesses( | |
50 base::MemoryPressureListener::MemoryPressureLevel level); | |
51 | |
52 // Sends a memory pressure notification to the specified browser child process | |
53 // via its attached MemoryMessageFilter. | |
54 void SendPressureNotification( | |
55 const BrowserChildProcessHost* child_process_host, | |
56 base::MemoryPressureListener::MemoryPressureLevel level); | |
57 | |
58 // Sends a memory pressure notification to the specified renderer process via | |
59 // its attached MemoryMessageFilter. | |
60 void SendPressureNotification( | |
61 const RenderProcessHost* render_process_host, | |
62 base::MemoryPressureListener::MemoryPressureLevel level); | |
63 | |
64 protected: | |
65 virtual ~MemoryPressureControllerImpl(); | |
66 | |
67 private: | |
68 friend struct base::DefaultSingletonTraits<MemoryPressureControllerImpl>; | |
69 | |
70 MemoryPressureControllerImpl(); | |
71 | |
72 // Implementation of the various SendPressureNotification methods. | |
73 void SendPressureNotificationImpl( | |
74 const void* child_process_host, | |
75 base::MemoryPressureListener::MemoryPressureLevel level); | |
76 | |
77 // Map from untyped process host pointers to the associated memory message | |
78 // filters in the browser process. Always accessed on the IO thread. | |
79 typedef std::map<const void*, scoped_refptr<MemoryMessageFilter>> | |
80 MemoryMessageFilterMap; | |
81 MemoryMessageFilterMap memory_message_filters_; | |
82 | |
83 DISALLOW_COPY_AND_ASSIGN(MemoryPressureControllerImpl); | |
84 }; | |
85 | |
86 } // namespace content | |
87 | |
88 #endif // CONTENT_BROWSER_MEMORY_MEMORY_PRESSURE_CONTROLLER_IMPL_H_ | |
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