From: Dave Chinner <david@fromorbit.com>
To: "Cheung, Norman" <Norman.Cheung@kla-tencor.com>
Cc: "'linux-xfs@oss.sgi.com'" <linux-xfs@oss.sgi.com>
Subject: Re: Hung in D state during fclose
Date: Wed, 13 Feb 2013 16:15:52 +1100 [thread overview]
Message-ID: <20130213051552.GF26694@dastard> (raw)
In-Reply-To: <3542214BE3A3EF419F236DFE0F878BC9051A09@BL2PRD0310MB374.namprd03.prod.outlook.com>
On Wed, Feb 13, 2013 at 12:12:47AM +0000, Cheung, Norman wrote:
> Dave,
>
> One other point I have forgotten to mention is that the parent
> thread will wait for 5 minutes and then lower the thread priority
> (from -2 back to 20) and set a global variable to signal the
> threads to exit. The blocked thread responded well and exit from
> D state and fclose completed with no error.
So it's not hung - it's just very slow?
You have 256GB of memory. It's entirely possible that you've dirtied
a large amount of memory and everything is simply stuck waiting for
writeback to occur. Perhaps you should have a look at the
utilisation of your disks when this still occurs. 'iostat -x -d -m
5' will give you some insight into utilsation when a hang occurs...
> This cause me to wonder if it is possible that some XFS threads
> and my application thread might be in a deadlock.
Deadlocks are permanent, so what you are seeing is not a deadlock....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2013-02-13 5:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-12 6:17 Hung in D state during fclose Norman Cheung
2013-02-12 6:55 ` Dave Chinner
2013-02-12 7:01 ` Cheung, Norman
2013-02-12 10:20 ` Dave Chinner
2013-02-12 16:39 ` Cheung, Norman
2013-02-12 20:22 ` Dave Chinner
2013-02-12 21:06 ` Cheung, Norman
2013-02-12 22:21 ` Dave Chinner
2013-02-13 0:12 ` Cheung, Norman
2013-02-13 5:15 ` Dave Chinner [this message]
2013-02-14 4:53 ` Cheung, Norman
2013-02-26 19:41 ` Cheung, Norman
2013-02-26 20:31 ` Dave Chinner
-- strict thread matches above, loose matches on Subject: below --
2013-02-11 23:36 Cheung, Norman
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