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