Message-Id: <1785450541@web.de>
Date:	Sat, 12 May 2007 12:41:03 +0200
From:	devzero@....de
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add LZO1X compression support to the kernel

oh - and think of linux software suspend.
take a notebook with 2 GB of ram - that takes a while to write that to disk and read that back again.
using lzo compression for this may probably halve the time for suspend/resume

using a fast compression scheme 
> -----Ursprüngliche Nachricht-----
> Von: devzero@....de
> Gesendet: 11.05.07 22:48:15
> An: akpm@...ux-foundation.org
> CC: nitingupta.mail@...il.com,linux-kernel@...r.kernel.org
> Betreff: Re: [PATCH] Add LZO1X compression support to the kernel


> 
> >Why is this needed?  What code plans to use it?
> 
> it`s pretty useful because it`s and a damn fast and damn cpu friendly compression alorithm.
> 
> afaik, there is already a least one linux kernel-feature (under development) which is using lzo compression: 
> see compressed caching project at http://linux-mm.org/CompressedCaching & http://linuxcompressed.sourceforge.net/
> 
> seems, they have also done porting it to the kernel, so there is probably choice between two implemetations to merge.
> 
> >How many buffer overruns are there in it?
> 
> i don`t know :) 
> but, from a user-perspective,  lzo is really portable and seems to be a rock solid compression scheme.
> i`m sucessfully using it for years (lzop utility) and i know projects which compress gigabytes of data every day with lzop.
> furthermore, i know of at least 40 software projects using lzo compression, so this should have some level of maturity.
> 
> maybe i can add another software integrating lzo compression to the enumeration at http://www.lzop.de ? ;)
> 
> regards
> roland
> 
> 
> List:       linux-kernel
> Subject:    Re: [PATCH] Add LZO1X compression support to the kernel
> From:       Andrew Morton <akpm () linux-foundation ! org>
> Date:       2007-05-10 6:21:29
> Message-ID: 20070509232129.371f49d5.akpm () linux-foundation ! org
> [Download message RAW]
> 
> On Wed, 02 May 2007 09:56:23 +0100 Richard Purdie <richard@...nedhand.com> wrote:
> 
> > Current thinking is that lzo should get merged directly followed by the
> > subsystem parts through their specific trees. It appears this should
> > make it onto LKML despite the size so here goes.
> > 
> > Please keep in mind I haven't reformatted the LZO code itself as if I do
> > so, it will make maintenance of it against any changes in LZO itself
> > near impossible. In its current form, it should be possible to diff
> > against upstream. All the bad formatting is confined to a handful of
> > files in lib/lzo/ and the kernel interface should be clean.
> > 
> > I realise a maze of ifdefs still remain. I've already spent a lot of
> > time removing a ton of them and going much further might start to affect
> > diffability of the code - I hoping whats there is a good compromise.
> > 
> > I've asked the LZO author about the comments on lzo_copyright function
> > but the code is GPLv2 licensed so is suitable for inclusion in the
> > kernel.
> > 
> > 
> > 
> > Add LZO1X compression/decompression support to the kernel.
> > 
> > This is based on the standard userspace lzo library, particularly
> > minilzo with the headers much trimmed down and simplified for kernel
> > use. Its structured so that it should still diff with the userspace
> > version for ease of future updating.
> 
> Well that's attractive-looking code.
> 
> Why is this needed?  What code plans to use it?
> 
> How many buffer overruns are there in it?


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