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92 lines
2.6 KiB
92 lines
2.6 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#pragma once
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#include <cstddef>
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namespace paddle {
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namespace memory {
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namespace detail {
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// Forward Declarations
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class MetadataCache;
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/*! \brief A class used to interpret the contents of a memory block */
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class MemoryBlock {
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public:
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enum Type {
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FREE_CHUNK, // memory is free and idle
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ARENA_CHUNK, // memory is being occupied
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HUGE_CHUNK, // memory is out of management
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INVALID_CHUNK // memory is invalid
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};
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public:
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void init(MetadataCache& cache, Type t, size_t index, size_t size,
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void* left_buddy, void* right_buddy);
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public:
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/*! \brief The type of the allocation */
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Type type(MetadataCache& cache) const;
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/*! \brief The size of the data region */
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size_t size(MetadataCache& cache) const;
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/*! \brief An index to track the allocator */
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size_t index(MetadataCache& cache) const;
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/*! \brief The total size of the block */
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size_t total_size(MetadataCache& cache) const;
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/*! \brief Check the left buddy of the block */
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bool has_left_buddy(MetadataCache& cache) const;
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/*! \brief Check the right buddy of the block */
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bool has_right_buddy(MetadataCache& cache) const;
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/*! \brief Get the left buddy */
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MemoryBlock* left_buddy(MetadataCache& cache) const;
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/*! \brief Get the right buddy */
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MemoryBlock* right_buddy(MetadataCache& cache) const;
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public:
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/*! \brief Split the allocation into left/right blocks */
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void split(MetadataCache& cache, size_t size);
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/*! \brief Merge left and right blocks together */
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void merge(MetadataCache& cache, MemoryBlock* right_buddy);
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/*! \brief Mark the allocation as free */
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void mark_as_free(MetadataCache& cache);
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/*! \brief Change the type of the allocation */
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void set_type(MetadataCache& cache, Type t);
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public:
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/*! \brief Get a pointer to the memory block's data */
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void* data() const;
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/*! \brief Get a pointer to the memory block's metadata */
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MemoryBlock* metadata() const;
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public:
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static size_t overhead();
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};
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} // namespace detail
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} // namespace memory
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} // namespace paddle
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