1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_BASE_MEM_MAP_ARENA_POOL_H_ 18 #define ART_RUNTIME_BASE_MEM_MAP_ARENA_POOL_H_ 19 20 #include "base/arena_allocator.h" 21 22 namespace art { 23 24 class MemMapArenaPool final : public ArenaPool { 25 public: 26 explicit MemMapArenaPool(bool low_4gb = false, const char* name = "LinearAlloc"); 27 virtual ~MemMapArenaPool(); 28 Arena* AllocArena(size_t size) override; 29 void FreeArenaChain(Arena* first) override; 30 size_t GetBytesAllocated() const override; 31 void ReclaimMemory() override; 32 void LockReclaimMemory() override; 33 // Trim the maps in arenas by madvising, used by JIT to reduce memory usage. 34 void TrimMaps() override; 35 36 private: 37 const bool low_4gb_; 38 const char* name_; 39 Arena* free_arenas_; 40 // Use a std::mutex here as Arenas are second-from-the-bottom when using MemMaps, and MemMap 41 // itself uses std::mutex scoped to within an allocate/free only. 42 mutable std::mutex lock_; 43 44 DISALLOW_COPY_AND_ASSIGN(MemMapArenaPool); 45 }; 46 47 } // namespace art 48 49 #endif // ART_RUNTIME_BASE_MEM_MAP_ARENA_POOL_H_ 50