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// Copyright 2019 The Chromium Authors
// 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/functional/bind.h"
#include "base/functional/callback.h"
#include "base/memory/discardable_memory.h"
#include "base/memory/discardable_memory_allocator.h"
#include "base/memory/madv_free_discardable_memory_posix.h"
#include "base/trace_event/base_tracing.h"
#include "build/build_config.h"
namespace base {
class BASE_EXPORT MadvFreeDiscardableMemoryAllocatorPosix
: public DiscardableMemoryAllocator,
public base::trace_event::MemoryDumpProvider {
public:
MadvFreeDiscardableMemoryAllocatorPosix();
MadvFreeDiscardableMemoryAllocatorPosix(
const MadvFreeDiscardableMemoryAllocatorPosix&) = delete;
MadvFreeDiscardableMemoryAllocatorPosix& operator=(
const MadvFreeDiscardableMemoryAllocatorPosix&) = delete;
~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.
}
bool OnMemoryDump(const trace_event::MemoryDumpArgs& args,
trace_event::ProcessMemoryDump* pmd) override;
private:
std::atomic<size_t> bytes_allocated_{0};
};
} // namespace base
#endif // BASE_MEMORY_MADV_FREE_DISCARDABLE_MEMORY_ALLOCATOR_POSIX_H_
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