From: Mark Tinguely <tinguely@sgi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 0/3] xfs: allocation worker causes freelist buffer lock hang
Date: Thu, 20 Sep 2012 08:49:55 -0500 [thread overview]
Message-ID: <505B1F03.4070004@sgi.com> (raw)
In-Reply-To: <20120919233435.GF31501@dastard>
On 09/19/12 18:34, Dave Chinner wrote:
> I suspect the only way to fix this is to re-use the old workqueue
> method of avoiding blocking on the workqueue indefinitely. That is,
> if we fail to get the lock in this case, we return with EGAIN and
> requeue the work. __xfs_alloc_vextent() and xfs_alloc_fix_freelist()
> already have trylock support, so this should be fairly easy to do.
> If I also convert the work to delayed work, I can easily add a
> backoff that will prevent busy looping on the workqueue.
>
> I'll have a quick look at this and see what falls out....
Okay.
Many of these paths are not using an allocator worker (userdata==0)
and/or the loops are done within a new transaction.
--Mark.
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next prev parent reply other threads:[~2012-09-20 13:48 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-19 16:31 [PATCH 0/3] xfs: allocation worker causes freelist buffer lock hang tinguely
2012-09-19 16:31 ` [PATCH 1/3] xfs: restrict allocate worker to x86_64 tinguely
2012-09-19 21:54 ` Dave Chinner
2012-09-20 17:37 ` Mark Tinguely
2012-09-24 17:37 ` Ben Myers
2012-09-25 0:14 ` Dave Chinner
2012-09-19 16:31 ` [PATCH 2/3] xfs: move allocate worker tinguely
2012-09-19 16:31 ` [PATCH 3/3] xfs: zero allocation_args on the kernel stack tinguely
2012-09-19 23:41 ` Dave Chinner
2012-09-20 18:16 ` [PATCH 3/3 v2] " Mark Tinguely
2012-09-25 20:20 ` Ben Myers
2012-10-18 22:52 ` Ben Myers
2012-09-19 23:34 ` [PATCH 0/3] xfs: allocation worker causes freelist buffer lock hang Dave Chinner
2012-09-20 13:49 ` Mark Tinguely [this message]
2012-09-24 13:25 ` Dave Chinner
2012-09-24 17:11 ` Ben Myers
2012-09-24 18:09 ` Mark Tinguely
2012-09-25 0:56 ` Dave Chinner
2012-09-25 15:14 ` Mark Tinguely
2012-09-25 22:01 ` Dave Chinner
2012-09-26 14:14 ` Mark Tinguely
2012-09-26 23:41 ` Dave Chinner
2012-09-27 20:10 ` Mark Tinguely
2012-09-28 3:08 ` Dave Chinner
2012-10-01 22:10 ` [PATCH 0/3] xfs: allocation worker causes freelist buffer lock Mark Tinguely
2012-10-01 23:10 ` Dave Chinner
2012-09-27 22:48 ` [PATCH 0/3] xfs: allocation worker causes freelist buffer lock hang Ben Myers
2012-09-27 23:17 ` Mark Tinguely
2012-09-27 23:27 ` Mark Tinguely
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