1 // Copyright 2018 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 #pragma once 15 16 #include "aemu/base/Allocator.h" 17 18 #include <unordered_set> 19 20 #include <inttypes.h> 21 #include <stddef.h> 22 #include <string.h> 23 24 namespace gfxstream { 25 namespace guest { 26 27 // Class to make it easier to set up memory regions where it is fast 28 // to allocate/deallocate buffers that have size within 29 // the specified range. 30 class Pool : public Allocator { 31 public: 32 // minSize/maxSize: the target range of sizes for which we want to 33 // make allocations fast. the greater the range, the more space 34 // traded off. 35 // chunksPerSize: the target maximum number of live objects of 36 // each size that are expected. the higher it is, the more space 37 // traded off. 38 // 39 // Rough space cost formula: 40 // O(chunksPerSize * log2(maxSize / minSize) * maxSize) 41 Pool(size_t minSize = 4, 42 size_t maxSize = 4096, 43 size_t chunksPerSize = 1024); 44 45 // All memory allocated by this pool 46 // is automatically deleted when the pool 47 // is deconstructed. 48 ~Pool(); 49 50 void* alloc(size_t wantedSize) override; 51 void free(void* ptr); 52 53 // Convenience function to free everything currently allocated. 54 void freeAll(); 55 56 private: 57 class Impl; 58 Impl* mImpl = nullptr; 59 60 std::unordered_set<void*> mFallbackPtrs; 61 }; 62 63 } // namespace base 64 } // namespace android 65