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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 #include "content/browser/memory/memory_pressure_controller.h" | |
6 | |
7 #include "base/bind.h" | |
8 #include "base/memory/memory_pressure_listener.h" | |
9 #include "content/browser/memory/memory_message_filter.h" | |
10 #include "content/public/browser/browser_thread.h" | |
11 | |
12 namespace content { | |
13 | |
14 MemoryPressureController::MemoryPressureController() {} | |
15 | |
16 MemoryPressureController::~MemoryPressureController() {} | |
17 | |
18 void MemoryPressureController::OnMemoryMessageFilterAdded( | |
19 MemoryMessageFilter* filter) { | |
20 DCHECK_CURRENTLY_ON(BrowserThread::IO); | |
21 | |
22 // Add the message filter to the set of all memory message filters and check | |
23 // that it wasn't there beforehand. | |
24 const bool success = memory_message_filters_.insert(filter).second; | |
25 DCHECK(success); | |
Sami
2015/09/23 10:29:44
This might complain about |success| not being used
petrcermak
2015/09/23 10:32:37
This pattern is used in other parts of the codebas
| |
26 | |
27 // There's no need to send a message to the child process if memory pressure | |
28 // notifications are not suppressed. | |
29 if (base::MemoryPressureListener::AreNotificationsSuppressed()) | |
30 filter->SendSetPressureNotificationsSuppressed(true); | |
31 } | |
32 | |
33 void MemoryPressureController::OnMemoryMessageFilterRemoved( | |
34 MemoryMessageFilter* filter) { | |
35 DCHECK_CURRENTLY_ON(BrowserThread::IO); | |
36 | |
37 // Remove the message filter from the set of all memory message filters and | |
38 // check that it was there beforehand. | |
39 const bool success = memory_message_filters_.erase(filter) == 1u; | |
40 DCHECK(success); | |
41 } | |
42 | |
43 // static | |
44 MemoryPressureController* MemoryPressureController::GetInstance() { | |
45 return base::Singleton< | |
46 MemoryPressureController, | |
47 base::LeakySingletonTraits<MemoryPressureController>>::get(); | |
48 } | |
49 | |
50 void MemoryPressureController::SetPressureNotificationsSuppressedInAllProcesses( | |
51 bool suppressed) { | |
52 if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) { | |
53 // Note that passing base::Unretained(this) is safe here because the | |
54 // controller is a leaky singleton (i.e. it is never deleted). | |
55 BrowserThread::PostTask( | |
56 BrowserThread::IO, FROM_HERE, | |
57 base::Bind(&MemoryPressureController:: | |
58 SetPressureNotificationsSuppressedInAllProcesses, | |
59 base::Unretained(this), suppressed)); | |
60 return; | |
61 } | |
62 | |
63 // Enable/disable suppressing memory notifications in the browser process. | |
64 base::MemoryPressureListener::SetNotificationsSuppressed(suppressed); | |
65 | |
66 // Enable/disable suppressing memory notifications in all child processes. | |
67 for (MemoryMessageFilterSet::iterator it = memory_message_filters_.begin(); | |
68 it != memory_message_filters_.end(); ++it) { | |
69 it->get()->SendSetPressureNotificationsSuppressed(suppressed); | |
70 } | |
71 } | |
72 | |
73 } // namespace content | |
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