| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| #ifndef IMPALA_RUNTIME_SYSTEM_ALLOCATOR_H |
| #define IMPALA_RUNTIME_SYSTEM_ALLOCATOR_H |
| |
| #include "common/status.h" |
| |
| #include "runtime/bufferpool/buffer-pool.h" |
| |
| namespace impala { |
| |
| /// The underlying memory allocator for the buffer pool that allocates buffer memory from |
| /// the operating system using mmap(). All buffers are allocated through the BufferPool's |
| /// SystemAllocator. The allocator only handles allocating buffers that are power-of-two |
| /// multiples of the minimum buffer length. |
| class SystemAllocator { |
| public: |
| SystemAllocator(int64_t min_buffer_len); |
| |
| /// Allocate memory for a buffer of 'len' bytes. 'len' must be a power-of-two multiple |
| /// of the minimum buffer length. |
| Status Allocate(int64_t len, BufferPool::BufferHandle* buffer) WARN_UNUSED_RESULT; |
| |
| /// Free the memory for a previously-allocated buffer. |
| void Free(BufferPool::BufferHandle&& buffer); |
| |
| private: |
| /// Allocate 'len' bytes of memory for a buffer via mmap(). |
| Status AllocateViaMMap(int64_t len, uint8_t** buffer_mem); |
| |
| /// Allocate 'len' bytes of memory for a buffer via our malloc implementation. |
| Status AllocateViaMalloc(int64_t len, uint8_t** buffer_mem); |
| |
| const int64_t min_buffer_len_; |
| }; |
| } |
| |
| #endif |