From: sashiko-bot@kernel.org
To: "Michal Wilczynski" <m.wilczynski@samsung.com>
Cc: linux-s390@vger.kernel.org, "Heiko Carstens" <hca@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>
Subject: Re: [PATCH v2 06/15] lib/lz4: backport upstream's aarch64 fast decode loop enablement
Date: Fri, 06 Nov 2026 14:47:09 +0000 [thread overview]
Message-ID: <sashiko-outbox-201606@kernel.org> (raw)
In-Reply-To: <20261106-lz4-vendor-upstream-v2-6-ee04c3f0d7dc@samsung.com>
> v1.10.0 leaves LZ4_FAST_DEC_LOOP off for aarch64 built with clang, after
> a slowdown reported on some Android phones in 2019 (upstream PR #707).
> An arm64 kernel built with clang therefore decodes with the slower loop.
>
> Upstream has since enabled it for all aarch64, in three unreleased
> commits:
>
> commit 0aa33884faf5 ("[LZ4] Limit disabling LZ4_FAST_DEC_LOOP to aarch64+clang+android")
> commit 51f8af506b4a ("Fix missing endif")
> commit ed86bc1ed802 ("AArch64: Enable LZ4_FAST_DEC_LOOP for Android")
>
> Arm measured +3.5% to +15.6% on Cortex-A510 to X4 with clang. Take the
> lz4.c hunks of all three. This goes away at the next re-sync.
>
> Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261106-lz4-vendor-upstream-v2-0-ee04c3f0d7dc@samsung.com?part=6
next prev parent reply other threads:[~2026-11-06 14:47 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20261106144247eucas1p15bdd0704f32d1cb3b19f9d2296a0cbc3@eucas1p1.samsung.com>
2026-11-06 14:42 ` [PATCH v2 00/15] lib/lz4: stop forking upstream LZ4, vendor it instead Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:42 ` [PATCH v2 01/15] lib/decompress_unlz4: use LZ4_decompress_safe_partial() before boot Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:59 ` sashiko-bot
2026-11-06 14:42 ` [PATCH v2 02/15] lib/lz4: remove LZ4_decompress_fast() and its variants Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:47 ` sashiko-bot
2026-11-06 14:42 ` [PATCH v2 03/15] zram: lz4hc: reset the dictionary stream once, not per page Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:49 ` sashiko-bot
2026-11-10 5:31 ` Sergey Senozhatsky
2026-11-12 11:50 ` Michal Wilczynski
2026-11-06 14:42 ` [PATCH v2 04/15] lib/lz4: import upstream LZ4 sources verbatim Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:48 ` sashiko-bot
2026-11-06 14:42 ` [PATCH v2 05/15] lib/lz4: backport upstream's -Wmissing-prototypes fix Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:46 ` sashiko-bot
2026-11-06 14:42 ` [PATCH v2 06/15] lib/lz4: backport upstream's aarch64 fast decode loop enablement Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:47 ` sashiko-bot [this message]
2026-11-06 14:42 ` [f2fs-dev] [PATCH v2 07/15] lib/lz4: backport upstream's match length limit fix Michal Wilczynski
2026-11-06 14:42 ` Michal Wilczynski
2026-11-06 14:50 ` sashiko-bot
2026-11-06 14:42 ` [f2fs-dev] [PATCH v2 08/15] lib/lz4: add the build environment for the vendored sources Michal Wilczynski
2026-11-06 14:42 ` Michal Wilczynski
2026-11-06 14:57 ` sashiko-bot
2026-11-06 14:42 ` [f2fs-dev] [PATCH v2 09/15] arch: boot: put the LZ4 freestanding headers on the decompressor path Michal Wilczynski
2026-11-06 14:42 ` Michal Wilczynski
2026-11-06 14:49 ` sashiko-bot
2026-11-06 14:42 ` [f2fs-dev] [PATCH v2 10/15] lib/lz4: switch the compressor to the vendored sources Michal Wilczynski
2026-11-06 14:42 ` Michal Wilczynski
2026-11-06 14:52 ` sashiko-bot
2026-11-07 1:40 ` kernel test robot
2026-11-10 5:36 ` Sergey Senozhatsky
2026-11-10 5:36 ` [f2fs-dev] " Sergey Senozhatsky
2026-11-12 12:02 ` Michal Wilczynski
2026-11-12 12:02 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] [PATCH v2 11/15] lib/lz4: switch the HC " Michal Wilczynski
2026-11-06 14:42 ` Michal Wilczynski
2026-11-06 14:54 ` sashiko-bot
2026-11-06 14:42 ` [f2fs-dev] [PATCH v2 12/15] lib/lz4: widen LZ4_DECOMPRESS_INPLACE_MARGIN for the fast decode loop Michal Wilczynski
2026-11-06 14:42 ` Michal Wilczynski
2026-11-06 14:52 ` sashiko-bot
2026-11-11 22:02 ` Gao Xiang
2026-11-11 22:02 ` [f2fs-dev] " Gao Xiang via Linux-f2fs-devel
2026-11-12 12:40 ` Michal Wilczynski
2026-11-12 12:40 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] [PATCH v2 13/15] lib/lz4: switch the decompressor to the vendored sources Michal Wilczynski
2026-11-06 14:42 ` Michal Wilczynski
2026-11-06 14:57 ` sashiko-bot
2026-11-10 5:39 ` Sergey Senozhatsky
2026-11-10 5:39 ` [f2fs-dev] " Sergey Senozhatsky
2026-11-12 12:06 ` Michal Wilczynski
2026-11-12 12:06 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:42 ` [PATCH v2 14/15] lib/lz4: replace lz4_kernel_api.h's prototypes with <linux/lz4.h> Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-06 14:51 ` sashiko-bot
2026-11-06 14:42 ` [PATCH v2 15/15] MAINTAINERS: add an entry for the LZ4 compression library Michal Wilczynski
2026-11-06 14:42 ` [f2fs-dev] " Michal Wilczynski
2026-11-12 11:25 ` [PATCH v2 00/15] lib/lz4: stop forking upstream LZ4, vendor it instead Michal Wilczynski
2026-11-12 11:25 ` [f2fs-dev] " Michal Wilczynski
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