linux-kernel - Re: writeout stalls in current -git

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Message-ID: <20071108003811.GP995458@sgi.com>
Date:	Thu, 8 Nov 2007 11:38:11 +1100
From:	David Chinner <dgc@....com>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	David Chinner <dgc@....com>, Fengguang Wu <wfg@...l.ustc.edu.cn>,
	Peter Zijlstra <peterz@...radead.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: writeout stalls in current -git

On Wed, Nov 07, 2007 at 08:15:06AM +0100, Torsten Kaiser wrote:
> On 11/7/07, David Chinner <dgc@....com> wrote:
> > Ok, so it's not synchronous writes that we are doing - we're just
> > submitting bio's tagged as WRITE_SYNC to get the I/O issued quickly.
> > The "synchronous" nature appears to be coming from higher level
> > locking when reclaiming inodes (on the flush lock). It appears that
> > inode write clustering is failing completely so we are writing the
> > same block multiple times i.e. once for each inode in the cluster we
> > have to write.
> 
> Works for me. The only remaining stalls are sub second and look
> completely valid, considering the amount of files being removed.
....
> Tested-by: Torsten Kaiser <just.for.lkml@...glemail.com>

Great - thanks for reporting the problem and testing the fix.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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