linux-ext4 - Re: RT/ext4/jbd2 circular dependency

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Message-ID: <20141113190644.GA12075@quack.suse.cz>
Date:	Thu, 13 Nov 2014 20:06:44 +0100
From:	Jan Kara <jack@...e.cz>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Chris Friesen <chris.friesen@...driver.com>,
	Austin Schuh <austin@...oton-tech.com>, pavel@...linux.ru,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-ext4@...r.kernel.org, adilger.kernel@...ger.ca,
	rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: RT/ext4/jbd2 circular dependency

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@...e.cz>
SUSE Labs, CR
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