linux-ext4 - Re: [RFC] JBD ordered mode rewrite

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Date:	Mon, 10 Mar 2008 17:30:40 +0100
From:	Jan Kara <jack@...e.cz>
To:	Josef Bacik <jbacik@...hat.com>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] JBD ordered mode rewrite

On Thu 06-03-08 14:05:03, Josef Bacik wrote:
> On Thursday 06 March 2008 12:42:09 pm Jan Kara wrote:
> >   Hi,
> >
> >   Below is my rewrite of ordered mode in JBD. Now we don't have a list of
> > data buffers that need syncing on transaction commit but a list of inodes
> > that need writeout during commit. This brings all sorts of advantages such
> > as possibility to get rid of journal heads and buffer heads for data
> > buffers in ordered mode, better ordering of writes on transaction commit,
> > simplification of some JBD code, no more anonymous pages when truncate of
> > data being committed happens. The patch has survived some light testing
> > but it still has some potential of eating your data so beware :) I've run
> > dbench to see whether we didn't decrease performance by different handling
> > of truncate and the throughput I'm getting on my machine is the same (OK,
> > is lower by 0.5%) if I disable the code in truncate waiting for commit to
> > finish... Also the throughput of dbench is about 2% better with my patch
> > than with current JBD.
> >   Any comments or testing most welcome.
> >
> > 									Honza
> 
> Just one nit, doesn't compile properly when jbd/ext3 are modules :).  Thanks 
> much,
  Thanks for spotting this. Will fix :).

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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