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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 "base/mac/memory_pressure_monitor.h" | |
6 | |
7 #include <dlfcn.h> | |
8 #include <sys/sysctl.h> | |
9 | |
10 #include "base/mac/mac_util.h" | |
11 | |
12 namespace base { | |
13 namespace mac { | |
14 | |
15 MemoryPressureListener::MemoryPressureLevel | |
16 MemoryPressureMonitor::MemoryPressureLevelForMacMemoryPressure( | |
17 int mac_memory_pressure) { | |
18 switch (mac_memory_pressure) { | |
19 case DISPATCH_MEMORYPRESSURE_NORMAL: | |
20 return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE; | |
21 case DISPATCH_MEMORYPRESSURE_WARN: | |
22 return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE; | |
23 case DISPATCH_MEMORYPRESSURE_CRITICAL: | |
24 return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL; | |
25 } | |
26 return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE; | |
27 } | |
28 | |
29 void MemoryPressureMonitor::NotifyMemoryPressureChanged( | |
30 dispatch_source_s* event_source) { | |
31 int mac_memory_pressure = dispatch_source_get_data(event_source); | |
32 MemoryPressureListener::MemoryPressureLevel memory_pressure_level = | |
33 MemoryPressureLevelForMacMemoryPressure(mac_memory_pressure); | |
34 MemoryPressureListener::NotifyMemoryPressure(memory_pressure_level); | |
35 } | |
36 | |
37 MemoryPressureMonitor::MemoryPressureMonitor() | |
38 : memory_level_event_source_(nullptr) { | |
39 // _dispatch_source_type_memorypressure is not available prior to 10.9. | |
40 dispatch_source_type_t dispatch_source_memorypressure = | |
41 static_cast<dispatch_source_type_t> | |
42 (dlsym(RTLD_NEXT, "_dispatch_source_type_memorypressure")); | |
43 if (dispatch_source_memorypressure) { | |
44 // The MemoryPressureListener doesn't want to know about transitions to | |
45 // MEMORY_PRESSURE_LEVEL_NONE so don't watch for | |
46 // DISPATCH_MEMORYPRESSURE_NORMAL notifications. | |
47 memory_level_event_source_.reset( | |
48 dispatch_source_create(dispatch_source_memorypressure, 0, | |
49 DISPATCH_MEMORYPRESSURE_WARN | | |
50 DISPATCH_MEMORYPRESSURE_CRITICAL, | |
51 dispatch_get_global_queue( | |
52 DISPATCH_QUEUE_PRIORITY_DEFAULT, 0))); | |
53 | |
54 dispatch_source_set_event_handler(memory_level_event_source_.get(), ^{ | |
55 NotifyMemoryPressureChanged(memory_level_event_source_.get()); | |
56 }); | |
57 dispatch_retain(memory_level_event_source_.get()); | |
58 dispatch_resume(memory_level_event_source_.get()); | |
59 } | |
60 } | |
61 | |
62 MemoryPressureMonitor::~MemoryPressureMonitor() { | |
63 } | |
64 | |
65 MemoryPressureListener::MemoryPressureLevel | |
66 MemoryPressureMonitor::GetCurrentPressureLevel() const { | |
67 if (base::mac::IsOSMountainLionOrEarlier()) { | |
68 return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE; | |
69 } | |
70 int mac_memory_pressure; | |
71 size_t length = sizeof(int); | |
72 sysctlbyname("kern.memorystatus_vm_pressure_level", &mac_memory_pressure, | |
73 &length, nullptr, 0); | |
74 return MemoryPressureLevelForMacMemoryPressure(mac_memory_pressure); | |
75 } | |
76 | |
77 } // namespace mac | |
78 } // namespace base | |
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