From: Richard Purdie Subject: [PATCH 0/5] Add LZO Compression Date: Fri, 04 May 2007 12:30:39 +0100 Message-ID: <1178278239.5839.43.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: linux-mtd , linux-crypto@vger.kernel.org, Randy Dunlap , Satyam Sharma To: LKML , David Woodhouse , herbert@gondor.apana.org.au Return-path: Received: from 3a.49.1343.static.theplanet.com ([67.19.73.58]:47109 "EHLO pug.o-hand.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932700AbXEDLax (ORCPT ); Fri, 4 May 2007 07:30:53 -0400 Sender: linux-crypto-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org The following patch series adds LZO compression support to the kernel and exposes it in a variety of places (jffs2, crypto). Its a resend of a previous posted series with the comments from Randy Dunlap and Satyam Sharma taken into account. Patch 1/5 is unchanged and large so will not be resent. This patch series is also available as: git://git.o-hand.com/linux-rpurdie linux-rpurdie-lzo (http://git.o-hand.com/?p=linux-rpurdie;a=shortlog;h=linux-rpurdie-lzo) LZO compression is particularly useful for jffs2 where significant boot time speedups (~10%) and file read speed improvements (~40%) are seen when its used with only a slight drop in file compression ratio. It also adds a favourlzo mode to jffs2 which is similar to the existing size mode but lets lzo compression win if the lzo compressed size is "similar" to but not the best compression ratio. This means we can keep zlib compression where it makes a significant difference to compressed file size. The final jffs2 patch which starts adding sysfs support for control of jffs2 options at runtime that are currently available only at boottime. There are several other controls which it may be desirable to add to the basic framework this patch creates in due course. Richard