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

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Date:	Mon, 5 Nov 2007 12:45:10 +1100
From:	David Chinner <dgc@....com>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	David Chinner <dgc@....com>, Peter Zijlstra <peterz@...radead.org>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com
Subject: Re: writeout stalls in current -git

On Sun, Nov 04, 2007 at 12:19:19PM +0100, Torsten Kaiser wrote:
> On 11/2/07, David Chinner <dgc@....com> wrote:
> > That's stalled waiting on the inode cluster buffer lock. That implies
> > that the inode lcuser is already being written out and the inode has
> > been redirtied during writeout.
> >
> > Does the kernel you are testing have the "flush inodes in ascending
> > inode number order" patches applied? If so, can you remove that
> > patch and see if the problem goes away?
> 
> I can now confirm, that I see this also with the current mainline-git-version
> I used 2.6.24-rc1-git-b4f555081fdd27d13e6ff39d455d5aefae9d2c0c
> plus the fix for the sg changes in ieee1394.

Ok, so it's probably a side effect of the writeback changes.

Attached are two patches (two because one was in a separate patchset as
a standalone change) that should prevent async writeback from blocking
on locked inode cluster buffers. Apply the xfs-factor-inotobp patch first.
Can you see if this fixes the problem?

Cheers,

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



View attachment "xfs-factor-inotobp" of type "text/plain" (9595 bytes)

View attachment "xfs-iflush-blocking-fix" of type "text/plain" (6404 bytes)