| // 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_ashmem.h" |
| #include "base/memory/discardable_memory_ashmem_allocator.h" |
| #include "base/memory/discardable_memory_emulated.h" |
| #include "base/memory/discardable_memory_malloc.h" |
| |
| namespace base { |
| namespace { |
| |
| const char kAshmemAllocatorName[] = "DiscardableMemoryAshmemAllocator"; |
| |
| // When ashmem is used, have the DiscardableMemoryManager trigger userspace |
| // eviction when address space usage gets too high (e.g. 512 MBytes). |
| const size_t kAshmemMaxAddressSpaceUsage = 512 * 1024 * 1024; |
| |
| // Holds the state used for ashmem allocations. |
| struct AshmemGlobalContext { |
| AshmemGlobalContext() |
| : allocator(kAshmemAllocatorName, |
| GetOptimalAshmemRegionSizeForAllocator()) { |
| manager.SetMemoryLimit(kAshmemMaxAddressSpaceUsage); |
| } |
| |
| internal::DiscardableMemoryAshmemAllocator allocator; |
| internal::DiscardableMemoryManager manager; |
| |
| 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<AshmemGlobalContext>::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_ASHMEM, |
| 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_ASHMEM: { |
| AshmemGlobalContext* const global_context = g_context.Pointer(); |
| scoped_ptr<internal::DiscardableMemoryAshmem> memory( |
| new internal::DiscardableMemoryAshmem( |
| size, &global_context->allocator, &global_context->manager)); |
| if (!memory->Initialize()) |
| return scoped_ptr<DiscardableMemory>(); |
| |
| return memory.PassAs<DiscardableMemory>(); |
| } |
| 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 |
| void DiscardableMemory::PurgeForTesting() { |
| g_context.Pointer()->manager.PurgeAll(); |
| internal::DiscardableMemoryEmulated::PurgeForTesting(); |
| } |
| |
| } // namespace base |