From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934603AbdAGQ6r (ORCPT ); Sat, 7 Jan 2017 11:58:47 -0500 Received: from mailhost.informatik.uni-hamburg.de ([134.100.9.70]:57898 "EHLO mailhost.informatik.uni-hamburg.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751090AbdAGQ6i (ORCPT ); Sat, 7 Jan 2017 11:58:38 -0500 From: Sven Schmidt <4sschmid@informatik.uni-hamburg.de> To: akpm@linux-foundation.org Cc: bongkyu.kim@lge.com, rsalvaterra@gmail.com, sergey.senozhatsky@gmail.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net, linux-crypto@vger.kernel.org, anton@enomsg.org, ccross@android.com, keescook@chromium.org, tony.luck@intel.com, phillip@squashfs.org.uk Subject: [PATCH v2 0/4] Update LZ4 compressor module Date: Sat, 7 Jan 2017 17:55:41 +0100 Message-Id: <1483808145-18417-1-git-send-email-4sschmid@informatik.uni-hamburg.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1482259992-16680-1-git-send-email-4sschmid@informatik.uni-hamburg.de> References: <1482259992-16680-1-git-send-email-4sschmid@informatik.uni-hamburg.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset is for updating the LZ4 compression module to a version based on LZ4 v1.7.2 allowing to use the fast compression algorithm aka LZ4 fast which provides an "acceleration" parameter as a tradeoff between high compression ratio and high compression speed. We want to use LZ4 fast in order to support compression in lustre and (mostly, based on that) investigate data reduction techniques in behalf of storage systems. Also, it will be useful for other users of LZ4 compression, as with LZ4 fast it is possible to enable applications to use fast and/or high compression depending on the usecase. For instance, ZRAM is offering a LZ4 backend and could benefit from an updated LZ4 in the kernel. LZ4 homepage: http://www.lz4.org/ LZ4 source repository: https://github.com/lz4/lz4 Source version: 1.7.2 Benchmark (taken from [1], Core i5-4300U @1.9GHz): ----------------|--------------|----------------|---------- Compressor | Compression | Decompression | Ratio ----------------|--------------|----------------|---------- memcpy | 4200 MB/s | 4200 MB/s | 1.000 LZ4 fast 50 | 1080 MB/s | 2650 MB/s | 1.375 LZ4 fast 17 | 680 MB/s | 2220 MB/s | 1.607 LZ4 fast 5 | 475 MB/s | 1920 MB/s | 1.886 LZ4 default | 385 MB/s | 1850 MB/s | 2.101 [1] http://fastcompression.blogspot.de/2015/04/sampling-or-faster-lz4.html [PATCHv2 1/4] lib: Update LZ4 compressor module based on LZ4 v1.7.2 [PATCHv2 2/4] lib: Update decompress_unlz4 wrapper to work with new LZ4 module [PATCHv2 3/4] crypto: Change lz4 modules to work with new LZ4 module [PATCHv2 4/4] fs/pstore: fs/squashfs: Change LZ4 compressor functions to work with new LZ4 module v2: - Changed order of the patches since in the initial patchset the lz4.h was in the last patch but was referenced by the other ones - Split lib/decompress_unlz4.c in an own patch - Fixed errors reported by the buildbot - Further refactorings - Added more appropriate copyright note to include/linux/lz4.h