| // Copyright 2019 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. |
| |
| #ifndef BASE_MEMORY_MADV_FREE_DISCARDABLE_MEMORY_ALLOCATOR_POSIX_H_ |
| #define BASE_MEMORY_MADV_FREE_DISCARDABLE_MEMORY_ALLOCATOR_POSIX_H_ |
| |
| #include <stddef.h> |
| |
| #include <atomic> |
| #include <memory> |
| |
| #include "base/base_export.h" |
| #include "base/bind.h" |
| #include "base/callback.h" |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "base/memory/discardable_memory.h" |
| #include "base/memory/discardable_memory_allocator.h" |
| #include "base/memory/madv_free_discardable_memory_posix.h" |
| #include "build/build_config.h" |
| |
| namespace base { |
| class BASE_EXPORT MadvFreeDiscardableMemoryAllocatorPosix |
| : public DiscardableMemoryAllocator { |
| public: |
| MadvFreeDiscardableMemoryAllocatorPosix(); |
| ~MadvFreeDiscardableMemoryAllocatorPosix() override; |
| |
| std::unique_ptr<DiscardableMemory> AllocateLockedDiscardableMemory( |
| size_t size) override; |
| |
| size_t GetBytesAllocated() const override; |
| |
| void ReleaseFreeMemory() override { |
| // Do nothing, since MADV_FREE discardable memory does not keep any memory |
| // overhead that can be released. |
| } |
| |
| private: |
| std::atomic<size_t> bytes_allocated_{0}; |
| |
| DISALLOW_COPY_AND_ASSIGN(MadvFreeDiscardableMemoryAllocatorPosix); |
| }; |
| } // namespace base |
| |
| #endif // BASE_MEMORY_MADV_FREE_DISCARDABLE_MEMORY_ALLOCATOR_POSIX_H_ |