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2aa14b1ab2
Updates the kernel's zstd library to v1.5.2, the latest zstd release. The upstream tag it is updated to is `v1.5.2-kernel`, which contains several cherry-picked commits on top of the v1.5.2 release which are required for the kernel update. I will create this tag once the PR is ready to merge, until then reference the temporary upstream branch `v1.5.2-kernel-cherrypicks`. I plan to submit this patch as part of the v6.2 merge window. I've done basic build testing & testing on x86-64, i386, and aarch64. I'm merging these patches into my `zstd-next` branch, which is pulled into `linux-next` for further testing. I've benchmarked BtrFS with zstd compression on a x86-64 machine, and saw these results. Decompression speed is a small win across the board. The lower compression levels 1-4 see both compression speed and compression ratio wins. The higher compression levels see a small compression speed loss and about neutral ratio. I expect the lower compression levels to be used much more heavily than the high compression levels, so this should be a net win. Level CTime DTime Ratio 1 -2.95% -1.1% -0.7% 3 -3.5% -1.2% -0.5% 5 +3.7% -1.0% +0.0% 7 +3.2% -0.9% +0.0% 9 -4.3% -0.8% +0.1% Signed-off-by: Nick Terrell <terrelln@fb.com>
69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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* Copyright (c) Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef ZSTD_DEC_BLOCK_H
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#define ZSTD_DEC_BLOCK_H
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/*-*******************************************************
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* Dependencies
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*********************************************************/
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#include "../common/zstd_deps.h" /* size_t */
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#include <linux/zstd.h> /* DCtx, and some public functions */
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#include "../common/zstd_internal.h" /* blockProperties_t, and some public functions */
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#include "zstd_decompress_internal.h" /* ZSTD_seqSymbol */
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/* === Prototypes === */
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/* note: prototypes already published within `zstd.h` :
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* ZSTD_decompressBlock()
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*/
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/* note: prototypes already published within `zstd_internal.h` :
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* ZSTD_getcBlockSize()
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* ZSTD_decodeSeqHeaders()
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*/
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/* Streaming state is used to inform allocation of the literal buffer */
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typedef enum {
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not_streaming = 0,
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is_streaming = 1
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} streaming_operation;
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/* ZSTD_decompressBlock_internal() :
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* decompress block, starting at `src`,
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* into destination buffer `dst`.
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* @return : decompressed block size,
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* or an error code (which can be tested using ZSTD_isError())
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*/
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size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
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void* dst, size_t dstCapacity,
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const void* src, size_t srcSize, const int frame, const streaming_operation streaming);
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/* ZSTD_buildFSETable() :
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* generate FSE decoding table for one symbol (ll, ml or off)
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* this function must be called with valid parameters only
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* (dt is large enough, normalizedCounter distribution total is a power of 2, max is within range, etc.)
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* in which case it cannot fail.
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* The workspace must be 4-byte aligned and at least ZSTD_BUILD_FSE_TABLE_WKSP_SIZE bytes, which is
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* defined in zstd_decompress_internal.h.
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* Internal use only.
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*/
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void ZSTD_buildFSETable(ZSTD_seqSymbol* dt,
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const short* normalizedCounter, unsigned maxSymbolValue,
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const U32* baseValue, const U8* nbAdditionalBits,
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unsigned tableLog, void* wksp, size_t wkspSize,
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int bmi2);
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#endif /* ZSTD_DEC_BLOCK_H */
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