linux-kernel - Re: [PATCH] Add LZO1X compression support to the kernel

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Message-Id: <1783772957@web.de>
Date:	Fri, 11 May 2007 22:48:15 +0200
From:	devzero@....de
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, nitingupta.mail@...il.com
Subject: 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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