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64 lines
2.2 KiB
64 lines
2.2 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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//
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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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//
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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, 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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#include "paddle/fluid/memory/allocation/aligned_allocator.h"
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#include "paddle/fluid/platform/enforce.h"
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namespace paddle {
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namespace memory {
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namespace allocation {
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class AlignedAllocation : public Allocation {
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public:
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AlignedAllocation(AllocationPtr underlying_allocation, size_t offset)
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: Allocation(
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reinterpret_cast<uint8_t*>(underlying_allocation->ptr()) + offset,
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underlying_allocation->size() - offset,
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underlying_allocation->place()),
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underlying_allocation_(std::move(underlying_allocation)) {}
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private:
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AllocationPtr underlying_allocation_;
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};
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AlignedAllocator::AlignedAllocator(
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const std::shared_ptr<Allocator>& underlyning_allocator, size_t alignment)
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: underlying_allocator_(underlyning_allocator), alignment_(alignment) {
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PADDLE_ENFORCE_GT(
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alignment_, 0,
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platform::errors::InvalidArgument(
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"Alignment should be larger than 0, but got %d", alignment_));
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if (alignment_ & (alignment_ - 1)) {
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PADDLE_THROW(platform::errors::InvalidArgument(
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"Alignment should be power of 2 (2^N), but got %d", alignment_));
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}
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}
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bool AlignedAllocator::IsAllocThreadSafe() const {
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return underlying_allocator_->IsAllocThreadSafe();
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}
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Allocation* AlignedAllocator::AllocateImpl(size_t size) {
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auto raw_allocation = underlying_allocator_->Allocate(size + alignment_);
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size_t offset = AlignedPtrOffset(raw_allocation->ptr(), alignment_);
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return new AlignedAllocation(std::move(raw_allocation), offset);
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}
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void AlignedAllocator::FreeImpl(Allocation* allocation) { delete allocation; }
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} // namespace allocation
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} // namespace memory
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} // namespace paddle
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