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List:       linux-rt-users
Subject:    Re: RT/ext4/jbd2 circular dependency
From:       Jan Kara <jack () suse ! cz>
Date:       2014-11-13 19:06:44
Message-ID: 20141113190644.GA12075 () quack ! suse ! cz
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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
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