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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 DCHECK(memory_message_filters_.insert(filter).second); |
| 25 |
| 26 // There's no need to send a message to the child process if memory pressure |
| 27 // notifications are not suppressed. |
| 28 if (base::MemoryPressureListener::AreNotificationsSuppressed()) |
| 29 filter->SendSetPressureNotificationsSuppressed(true); |
| 30 } |
| 31 |
| 32 void MemoryPressureController::OnMemoryMessageFilterRemoved( |
| 33 MemoryMessageFilter* filter) { |
| 34 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| 35 |
| 36 // Remove the message filter from the set of all memory message filters and |
| 37 // check that it was there beforehand. |
| 38 DCHECK_EQ(1u, memory_message_filters_.erase(filter)); |
| 39 } |
| 40 |
| 41 // static |
| 42 MemoryPressureController* MemoryPressureController::GetInstance() { |
| 43 return base::Singleton< |
| 44 MemoryPressureController, |
| 45 base::LeakySingletonTraits<MemoryPressureController>>::get(); |
| 46 } |
| 47 |
| 48 void MemoryPressureController::SetPressureNotificationsSuppressedInAllProcesses( |
| 49 bool suppressed) { |
| 50 if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) { |
| 51 // Note that passing base::Unretained(this) is safe here because the |
| 52 // controller is a leaky singleton (i.e. it is never deleted). |
| 53 BrowserThread::PostTask( |
| 54 BrowserThread::IO, FROM_HERE, |
| 55 base::Bind(&MemoryPressureController:: |
| 56 SetPressureNotificationsSuppressedInAllProcesses, |
| 57 base::Unretained(this), suppressed)); |
| 58 return; |
| 59 } |
| 60 |
| 61 // Enable/disable suppressing memory notifications in the browser process. |
| 62 base::MemoryPressureListener::SetNotificationsSuppressed(suppressed); |
| 63 |
| 64 // Enable/disable suppressing memory notifications in all child processes. |
| 65 for (MemoryMessageFilterSet::iterator it = memory_message_filters_.begin(); |
| 66 it != memory_message_filters_.end(); ++it) { |
| 67 it->get()->SendSetPressureNotificationsSuppressed(suppressed); |
| 68 } |
| 69 } |
| 70 |
| 71 } // namespace content |
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