| // Copyright (c) 2013 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/discardable_memory.h" |
| |
| #include "base/android/sys_utils.h" |
| #include "base/basictypes.h" |
| #include "base/compiler_specific.h" |
| #include "base/lazy_instance.h" |
| #include "base/logging.h" |
| #include "base/memory/discardable_memory_allocator_android.h" |
| #include "base/memory/discardable_memory_emulated.h" |
| #include "base/memory/discardable_memory_malloc.h" |
| |
| namespace base { |
| namespace { |
| |
| const char kAshmemAllocatorName[] = "DiscardableMemoryAllocator"; |
| |
| struct DiscardableMemoryAllocatorWrapper { |
| DiscardableMemoryAllocatorWrapper() |
| : allocator(kAshmemAllocatorName, |
| GetOptimalAshmemRegionSizeForAllocator()) { |
| } |
| |
| internal::DiscardableMemoryAllocator allocator; |
| |
| private: |
| // Returns 64 MBytes for a 512 MBytes device, 128 MBytes for 1024 MBytes... |
| static size_t GetOptimalAshmemRegionSizeForAllocator() { |
| // Note that this may do some I/O (without hitting the disk though) so it |
| // should not be called on the critical path. |
| return base::android::SysUtils::AmountOfPhysicalMemoryKB() * 1024 / 8; |
| } |
| }; |
| |
| LazyInstance<DiscardableMemoryAllocatorWrapper>::Leaky g_context = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| // static |
| void DiscardableMemory::RegisterMemoryPressureListeners() { |
| internal::DiscardableMemoryEmulated::RegisterMemoryPressureListeners(); |
| } |
| |
| // static |
| void DiscardableMemory::UnregisterMemoryPressureListeners() { |
| internal::DiscardableMemoryEmulated::UnregisterMemoryPressureListeners(); |
| } |
| |
| // static |
| void DiscardableMemory::GetSupportedTypes( |
| std::vector<DiscardableMemoryType>* types) { |
| const DiscardableMemoryType supported_types[] = { |
| DISCARDABLE_MEMORY_TYPE_ANDROID, |
| DISCARDABLE_MEMORY_TYPE_EMULATED, |
| DISCARDABLE_MEMORY_TYPE_MALLOC |
| }; |
| types->assign(supported_types, supported_types + arraysize(supported_types)); |
| } |
| |
| // static |
| scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemoryWithType( |
| DiscardableMemoryType type, size_t size) { |
| switch (type) { |
| case DISCARDABLE_MEMORY_TYPE_NONE: |
| case DISCARDABLE_MEMORY_TYPE_MAC: |
| return scoped_ptr<DiscardableMemory>(); |
| case DISCARDABLE_MEMORY_TYPE_ANDROID: { |
| return g_context.Pointer()->allocator.Allocate(size); |
| } |
| case DISCARDABLE_MEMORY_TYPE_EMULATED: { |
| scoped_ptr<internal::DiscardableMemoryEmulated> memory( |
| new internal::DiscardableMemoryEmulated(size)); |
| if (!memory->Initialize()) |
| return scoped_ptr<DiscardableMemory>(); |
| |
| return memory.PassAs<DiscardableMemory>(); |
| } |
| case DISCARDABLE_MEMORY_TYPE_MALLOC: { |
| scoped_ptr<internal::DiscardableMemoryMalloc> memory( |
| new internal::DiscardableMemoryMalloc(size)); |
| if (!memory->Initialize()) |
| return scoped_ptr<DiscardableMemory>(); |
| |
| return memory.PassAs<DiscardableMemory>(); |
| } |
| } |
| |
| NOTREACHED(); |
| return scoped_ptr<DiscardableMemory>(); |
| } |
| |
| // static |
| bool DiscardableMemory::PurgeForTestingSupported() { |
| return false; |
| } |
| |
| // static |
| void DiscardableMemory::PurgeForTesting() { |
| NOTIMPLEMENTED(); |
| } |
| |
| } // namespace base |