提交 929f9cbd 编写于 作者: L liaogang

ENH: Add Metadata for memory block

上级 89110fd2
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
Licensed 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. */
#include "paddle/memory/detail/metadata.h"
#include <functional>
namespace paddle {
namespace memory {
namespace detail {
Metadata::Metadata(MemoryBlock::Type t, size_t i, size_t s, size_t ts,
MemoryBlock* l, MemoryBlock* r)
: type(t),
index(i),
size(s),
total_size(ts),
left_buddy(l),
right_buddy(r) {}
template <class T>
inline void hash_combine(std::size_t& seed, const T& v) {
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
inline size_t hash(const Metadata* metadata, size_t initial_seed) {
size_t seed = initial_seed;
hash_combine(seed, (size_t)metadata->type);
hash_combine(seed, metadata->index);
hash_combine(seed, metadata->size);
hash_combine(seed, metadata->total_size);
hash_combine(seed, metadata->left_buddy);
hash_combine(seed, metadata->right_buddy);
return seed;
}
void Metadata::update_guards() {
guard_begin = hash(this, 1);
guard_end = hash(this, 2);
}
bool Metadata::check_guards() const {
return guard_begin == hash(this, 1) && guard_end == hash(this, 2);
}
} // namespace detail
} // namespace memory
} // namespace paddle
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
Licensed 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. */
#pragma once
#include "paddle/memory/detail/memory_block.h"
#include <stddef.h>
namespace paddle {
namespace memory {
namespace detail {
class Metadata {
public:
Metadata(MemoryBlock::Type t, size_t i, size_t s, size_t ts, MemoryBlock* l,
MemoryBlock* r);
public:
/*! \brief Update the guards when metadata is changed */
void update_guards();
/*! \brief Check consistency to previous modification */
bool check_guards() const;
public:
// TODO(gangliao): compress this
// clang-format off
size_t guard_begin = 0;
MemoryBlock::Type type = MemoryBlock::INVALID_CHUNK;
size_t index = 0;
size_t size = 0;
size_t total_size = 0;
MemoryBlock* left_buddy = nullptr;
MemoryBlock* right_buddy = nullptr;
size_t guard_end = 0;
// clang-format on
};
} // namespace detail
} // namespace memory
} // namespace paddle
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