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Merge remote-tracking branch 'upstream/master' into fix-47508
Signed-off-by: Yang Keao <yangkeao@chunibyo.icu>
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| - JmPotato | ||
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| - lamxTyler | ||
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| // Copyright 2023 PingCAP, Inc. | ||
| // | ||
| // 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. | ||
|
|
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| package external | ||
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| import "github.com/docker/go-units" | ||
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| // DefaultBlockSize is the default block size for preAllocKVBuf. | ||
| const DefaultBlockSize = 16 * units.MiB | ||
|
|
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| // preAllocKVBuf pre allocates a large buffer of limit memLimit to reduce memory | ||
| // allocation, all space in this buffer will be reused when reset. | ||
| type preAllocKVBuf struct { | ||
| blocks [][]byte | ||
| blockSize int | ||
| curBlock []byte | ||
| curBlockIdx int | ||
| curIdx int | ||
| } | ||
|
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| func newPreAllocKVBuf(memLimit uint64, blockSize int) *preAllocKVBuf { | ||
| blockCount := (memLimit + uint64(blockSize) - 1) / uint64(blockSize) | ||
| b := &preAllocKVBuf{ | ||
| blocks: make([][]byte, 0, blockCount), | ||
| blockSize: blockSize, | ||
| } | ||
| for i := 0; i < int(blockCount); i++ { | ||
| b.blocks = append(b.blocks, make([]byte, blockSize)) | ||
| } | ||
| b.reset() | ||
| return b | ||
| } | ||
|
|
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| func (b *preAllocKVBuf) Alloc(s int) (blockIdx int32, res []byte, offset int32, allocated bool) { | ||
| if s > b.blockSize { | ||
| return | ||
| } | ||
| if b.blockSize-b.curIdx < s { | ||
| if b.curBlockIdx+1 >= len(b.blocks) { | ||
| return | ||
| } | ||
| b.curBlockIdx++ | ||
| b.curBlock = b.blocks[b.curBlockIdx] | ||
| b.curIdx = 0 | ||
| } | ||
| blockIdx = int32(b.curBlockIdx) | ||
| res = b.curBlock[b.curIdx : b.curIdx+s] | ||
| offset = int32(b.curIdx) | ||
| allocated = true | ||
|
|
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| b.curIdx += s | ||
| return | ||
| } | ||
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| func (b *preAllocKVBuf) reset() { | ||
| b.curBlockIdx = 0 | ||
| b.curBlock = b.blocks[0] | ||
| b.curIdx = 0 | ||
| } | ||
|
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| func (b *preAllocKVBuf) destroy() { | ||
| b.blocks = nil | ||
| b.curBlock = nil | ||
| } |
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