| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/memory/memory_pressure_monitor_mac.h" |
| |
| #include <dlfcn.h> |
| #include <sys/sysctl.h> |
| |
| #include "base/mac/mac_util.h" |
| |
| namespace base { |
| namespace mac { |
| |
| MemoryPressureListener::MemoryPressureLevel |
| MemoryPressureMonitor::MemoryPressureLevelForMacMemoryPressure( |
| int mac_memory_pressure) { |
| switch (mac_memory_pressure) { |
| case DISPATCH_MEMORYPRESSURE_NORMAL: |
| return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE; |
| case DISPATCH_MEMORYPRESSURE_WARN: |
| return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE; |
| case DISPATCH_MEMORYPRESSURE_CRITICAL: |
| return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL; |
| } |
| return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE; |
| } |
| |
| void MemoryPressureMonitor::NotifyMemoryPressureChanged( |
| dispatch_source_s* event_source) { |
| int mac_memory_pressure = dispatch_source_get_data(event_source); |
| MemoryPressureListener::MemoryPressureLevel memory_pressure_level = |
| MemoryPressureLevelForMacMemoryPressure(mac_memory_pressure); |
| MemoryPressureListener::NotifyMemoryPressure(memory_pressure_level); |
| } |
| |
| MemoryPressureMonitor::MemoryPressureMonitor() |
| : memory_level_event_source_(nullptr) { |
| // _dispatch_source_type_memorypressure is not available prior to 10.9. |
| dispatch_source_type_t dispatch_source_memorypressure = |
| static_cast<dispatch_source_type_t> |
| (dlsym(RTLD_NEXT, "_dispatch_source_type_memorypressure")); |
| if (dispatch_source_memorypressure) { |
| // The MemoryPressureListener doesn't want to know about transitions to |
| // MEMORY_PRESSURE_LEVEL_NONE so don't watch for |
| // DISPATCH_MEMORYPRESSURE_NORMAL notifications. |
| memory_level_event_source_.reset( |
| dispatch_source_create(dispatch_source_memorypressure, 0, |
| DISPATCH_MEMORYPRESSURE_WARN | |
| DISPATCH_MEMORYPRESSURE_CRITICAL, |
| dispatch_get_global_queue( |
| DISPATCH_QUEUE_PRIORITY_DEFAULT, 0))); |
| |
| dispatch_source_set_event_handler(memory_level_event_source_.get(), ^{ |
| NotifyMemoryPressureChanged(memory_level_event_source_.get()); |
| }); |
| dispatch_retain(memory_level_event_source_.get()); |
| dispatch_resume(memory_level_event_source_.get()); |
| } |
| } |
| |
| MemoryPressureMonitor::~MemoryPressureMonitor() { |
| } |
| |
| MemoryPressureListener::MemoryPressureLevel |
| MemoryPressureMonitor::GetCurrentPressureLevel() const { |
| if (base::mac::IsOSMountainLionOrEarlier()) { |
| return MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE; |
| } |
| int mac_memory_pressure; |
| size_t length = sizeof(int); |
| sysctlbyname("kern.memorystatus_vm_pressure_level", &mac_memory_pressure, |
| &length, nullptr, 0); |
| return MemoryPressureLevelForMacMemoryPressure(mac_memory_pressure); |
| } |
| |
| } // namespace mac |
| } // namespace base |