From 2aa14b1ab2c41a4fe41efae80d58bb77da91f19f Mon Sep 17 00:00:00 2001 From: Nick Terrell Date: Mon, 17 Oct 2022 13:32:37 -0700 Subject: zstd: import usptream v1.5.2 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 --- lib/zstd/compress/zstd_compress_literals.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'lib/zstd/compress/zstd_compress_literals.h') diff --git a/lib/zstd/compress/zstd_compress_literals.h b/lib/zstd/compress/zstd_compress_literals.h index 9904c0cd30a0..9775fb97cb70 100644 --- a/lib/zstd/compress/zstd_compress_literals.h +++ b/lib/zstd/compress/zstd_compress_literals.h @@ -18,12 +18,14 @@ size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize); +/* If suspectUncompressible then some sampling checks will be run to potentially skip huffman coding */ size_t ZSTD_compressLiterals (ZSTD_hufCTables_t const* prevHuf, ZSTD_hufCTables_t* nextHuf, ZSTD_strategy strategy, int disableLiteralCompression, void* dst, size_t dstCapacity, const void* src, size_t srcSize, void* entropyWorkspace, size_t entropyWorkspaceSize, - const int bmi2); + const int bmi2, + unsigned suspectUncompressible); #endif /* ZSTD_COMPRESS_LITERALS_H */ -- cgit