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From: Jan Kara <jack@suse.cz>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Chris Friesen <chris.friesen@windriver.com>,
	Austin Schuh <austin@peloton-tech.com>,
	pavel@pavlinux.ru, "J. Bruce Fields" <bfields@fieldses.org>,
	linux-ext4@vger.kernel.org, adilger.kernel@dilger.ca,
	rt-users <linux-rt-users@vger.kernel.org>
Subject: Re: RT/ext4/jbd2 circular dependency
Date: Thu, 13 Nov 2014 20:06:44 +0100	[thread overview]
Message-ID: <20141113190644.GA12075@quack.suse.cz> (raw)
In-Reply-To: <20141030232437.GF31927@thunk.org>

On Thu 30-10-14 19:24:37, Ted Tso wrote:
> On Thu, Oct 30, 2014 at 10:11:26PM +0100, Thomas Gleixner wrote:
> > 
> > That's a way better explanation than what I saw in the commit logs and
> > it actually maps to the observed traces and stackdumps.
> 
> I can't speak for Jan, but I suspect he didn't realize that there was
> a problem.  The commit description in b34090e5e2 makes it clear that
> the intent was a performance improvement, and not an attempt to fix a
> potential deadlock bug.
  Yeah, correct. When I wrote b34090e5e2 I did that because I have realized
that journal reservations would create similar deadlock opportunity as
Chris has observed. I hadn't realized the problem is already in the code :)

								Honza

-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR

  parent reply	other threads:[~2014-11-13 19:06 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-17 17:50 Hang writing to nfs-mounted filesystem from client, all nfsd tasks on server blocked in D Chris Friesen
2014-10-17 17:50 ` Chris Friesen
2014-10-17 18:01 ` Pavel Vasilyev
     [not found]   ` <CANGgnMbQmsdMDJUx7Bop9Xs=jQMmAJgWRjhXVFUGx-DwF=inYw@mail.gmail.com>
2014-10-23 17:54     ` RT/ext4/jbd2 circular dependency (was: Re: Hang writing to nfs-mounted filesystem from client) Chris Friesen
2014-10-26 14:25       ` Thomas Gleixner
2014-10-27 16:22         ` RT/ext4/jbd2 circular dependency Chris Friesen
2014-10-29 18:05           ` Thomas Gleixner
2014-10-29 19:11             ` Chris Friesen
2014-10-29 19:26               ` Thomas Gleixner
2014-10-29 20:17                 ` Chris Friesen
2014-10-29 20:31                   ` Thomas Gleixner
2014-10-29 23:19                 ` Theodore Ts'o
2014-10-29 23:37                   ` Chris Friesen
2014-10-30  1:44                     ` Theodore Ts'o
2014-10-30  8:15                       ` Kevin Liao
2014-10-30 12:24                         ` Theodore Ts'o
2014-10-30 21:11                   ` Thomas Gleixner
2014-10-30 23:24                     ` Theodore Ts'o
2014-10-31  0:08                       ` Chris Friesen
2014-10-31  0:16                       ` Thomas Gleixner
2014-11-13 19:06                       ` Jan Kara [this message]
2014-10-27 19:57       ` Chris Friesen
     [not found] ` <544156FE.7070905-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2014-10-17 18:58   ` Hang writing to nfs-mounted filesystem from client, all nfsd tasks on server blocked in D Austin Schuh
2014-10-17 18:58     ` Austin Schuh
2014-10-17 19:12   ` Dmitry Monakhov
2014-10-17 19:12     ` Dmitry Monakhov
2014-10-18 17:05   ` Hang writing to nfs-mounted filesystem from client -- expected code path? Chris Friesen
2014-10-18 17:05     ` Chris Friesen

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