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From: Damien Wyart <damien.wyart@free.fr>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	chris.mason@oracle.com, david@fromorbit.com, hch@infradead.org,
	akpm@linux-foundation.org, jack@suse.cz,
	yanmin_zhang@linux.intel.com, richard@rsk.demon.co.uk
Subject: Re: [PATCH 0/12] Per-bdi writeback flusher threads v7
Date: Wed, 27 May 2009 07:49:21 +0200	[thread overview]
Message-ID: <20090527054921.GA4127@localhost.localdomain> (raw)
In-Reply-To: <20090527052101.GA28517@localhost.localdomain>

[-- Attachment #1: Type: text/plain, Size: 1029 bytes --]

> > > OK, I spotted the problem. If we fallback to the on-stack allocation in
> > > bdi_writeback_all(), then we do the wait for the work completion with
> > > the bdi_lock mutex held. This can deadlock with bdi_forker_task(), so if
> > > we require that to be invoked to make progress (happens if a thread
> > > needs to be restarted), then we have a deadlock on that mutex.

> > > I'll cook up a fix for this, but probably not before the morning.

> > Untested fix. I think it should work, but I haven't run it here yet.

> Thanks for your feedback and explanations. Will not be able to test the
> patch before the afternoon. Will then give feedback as soon as I can. Of
> course, I can also test a new fix or series if you send one in the
> morning, after your own testing.

Just ran a quick test with your fix applied and ran into the same
problem: manual sync stays in D state. I could capture SysRq-T, I am
attaching part of the output (which was very big and continuously
displaying).


Hope this helps,

-- 
Damien Wyart

[-- Attachment #2: sysrq_t.gz --]
[-- Type: text/plain, Size: 5711 bytes --]

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  reply	other threads:[~2009-05-27  5:49 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-26  9:33 [PATCH 0/12] Per-bdi writeback flusher threads v7 Jens Axboe
2009-05-26  9:33 ` [PATCH 01/12] ntfs: remove old debug check for dirty data in ntfs_put_super() Jens Axboe
2009-05-26  9:33 ` [PATCH 02/12] btrfs: properly register fs backing device Jens Axboe
2009-05-26  9:33 ` [PATCH 03/12] writeback: move dirty inodes from super_block to backing_dev_info Jens Axboe
2009-05-26  9:33 ` [PATCH 04/12] writeback: switch to per-bdi threads for flushing data Jens Axboe
2009-05-26  9:33 ` [PATCH 05/12] writeback: get rid of pdflush completely Jens Axboe
2009-05-26  9:33 ` [PATCH 06/12] writeback: separate the flushing state/task from the bdi Jens Axboe
2009-05-26  9:33 ` [PATCH 07/12] writeback: support > 1 flusher thread per bdi Jens Axboe
2009-06-04 17:44   ` Paul E. McKenney
2009-06-04 19:48     ` Jens Axboe
2009-05-26  9:33 ` [PATCH 08/12] writeback: include default_backing_dev_info in writeback Jens Axboe
2009-05-26  9:33 ` [PATCH 09/12] writeback: allow sleepy exit of default writeback task Jens Axboe
2009-05-26  9:33 ` [PATCH 10/12] writeback: add some debug inode list counters to bdi stats Jens Axboe
2009-05-26  9:33 ` [PATCH 11/12] writeback: add name to backing_dev_info Jens Axboe
2009-05-26  9:33 ` [PATCH 12/12] writeback: check for registered bdi in flusher add and inode dirty Jens Axboe
2009-05-26 15:25 ` [PATCH 0/12] Per-bdi writeback flusher threads v7 Damien Wyart
2009-05-26 16:41   ` Jens Axboe
2009-05-26 17:08     ` Damien Wyart
2009-05-26 17:10       ` Damien Wyart
2009-05-26 20:47       ` Jens Axboe
2009-05-26 21:11         ` Jens Axboe
2009-05-27  5:21           ` Damien Wyart
2009-05-27  5:49             ` Damien Wyart [this message]
2009-05-27  9:20               ` Jens Axboe
2009-05-27 13:15                 ` Damien Wyart
2009-05-27 15:05                   ` Jens Axboe
2009-05-27 21:06                     ` Andrew Morton
2009-05-28 10:20                       ` Jens Axboe
2009-05-27  6:17             ` Jens Axboe
2009-05-27  5:27 ` Zhang, Yanmin
2009-05-27  6:17   ` Jens Axboe
2009-06-02  2:07     ` Zhang, Yanmin
2009-06-02 11:53       ` Jens Axboe

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