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Re: writeout stalls in current -git

To: Torsten Kaiser <just.for.lkml@xxxxxxxxxxxxxx>
Subject: Re: writeout stalls in current -git
From: David Chinner <dgc@xxxxxxx>
Date: Mon, 5 Nov 2007 12:45:10 +1100
Cc: David Chinner <dgc@xxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>, Maxim Levitsky <maximlevitsky@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
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On Sun, Nov 04, 2007 at 12:19:19PM +0100, Torsten Kaiser wrote:
> On 11/2/07, David Chinner <dgc@xxxxxxx> 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?


Dave Chinner
Principal Engineer
SGI Australian Software Group

Attachment: xfs-factor-inotobp
Description: Text document

Attachment: xfs-iflush-blocking-fix
Description: Text document

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