From: Robert Varga <nite@hq.alert.sk>
To: linux-kernel@vger.kernel.org
Subject: Re: writing a plugin for reiserfs compression
Date: Fri, 2 Nov 2001 10:24:21 +0100 [thread overview]
Message-ID: <20011102102421.A25221@hq.alert.sk> (raw)
In-Reply-To: <3BE1C07D.5080205@antefacto.com> <Pine.LNX.4.30.0111012242060.3245-100000@mustard.heime.net>
In-Reply-To: <Pine.LNX.4.30.0111012242060.3245-100000@mustard.heime.net>; from roy@karlsbakk.net on Thu, Nov 01, 2001 at 10:43:37PM +0100
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On Thu, Nov 01, 2001 at 10:43:37PM +0100, Roy Sigurd Karlsbakk wrote:
> > Note this transparent ext2 compression patch is only available for 2.2
>
> Would it be hard to port to 2.4?
AFAIK kinda yes. It relies on IO going through block buffer cache:
Buffer cache contains the compressed data, while the page cache has it all decompressed.
This avoids excessive (de)compression (you need to compress data only when commiting page
to disk).
With 2.4 Ext2 moved (almost?) entirely out of buffer cache, you'll need to
create your own IO buffers. This is the only solution I came up with. Is there some
other approach how to cope with this problem ?
--
Kind regards,
Robert Varga
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next prev parent reply other threads:[~2001-11-02 9:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-01 20:17 Roy Sigurd Karlsbakk
2001-11-01 21:14 ` Andreas Dilger
2001-11-01 21:27 ` Roy Sigurd Karlsbakk
2001-11-01 21:37 ` Padraig Brady
2001-11-01 21:43 ` Roy Sigurd Karlsbakk
2001-11-02 9:24 ` Robert Varga [this message]
2001-11-01 23:16 ` Hans Reiser
2001-11-09 23:27 ` Andreas Dilger
-- strict thread matches above, loose matches on Subject: below --
2001-11-01 17:14 Roy Sigurd Karlsbakk
2001-11-01 20:07 ` Andreas Dilger
2001-11-01 23:01 ` Hans Reiser
2001-11-01 23:09 ` Hans Reiser
2001-11-01 22:54 ` Hans Reiser
2001-11-02 9:29 ` Nikita Danilov
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