/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_BASE_MEM_MAP_ARENA_POOL_H_
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#define ART_RUNTIME_BASE_MEM_MAP_ARENA_POOL_H_
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#include "base/arena_allocator.h"
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namespace art {
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class MemMapArenaPool final : public ArenaPool {
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public:
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explicit MemMapArenaPool(bool low_4gb = false, const char* name = "LinearAlloc");
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virtual ~MemMapArenaPool();
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Arena* AllocArena(size_t size) override;
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void FreeArenaChain(Arena* first) override;
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size_t GetBytesAllocated() const override;
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void ReclaimMemory() override;
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void LockReclaimMemory() override;
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// Trim the maps in arenas by madvising, used by JIT to reduce memory usage.
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void TrimMaps() override;
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private:
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const bool low_4gb_;
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const char* name_;
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Arena* free_arenas_;
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// Use a std::mutex here as Arenas are second-from-the-bottom when using MemMaps, and MemMap
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// itself uses std::mutex scoped to within an allocate/free only.
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mutable std::mutex lock_;
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DISALLOW_COPY_AND_ASSIGN(MemMapArenaPool);
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};
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} // namespace art
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#endif // ART_RUNTIME_BASE_MEM_MAP_ARENA_POOL_H_
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