From: Mike Galbraith <efault@gmx.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Chris Mason <chris.mason@fusionio.com>,
"Chris L. Mason" <clmason@fusionio.com>,
"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: 3.4.4-rt13: btrfs + xfstests 006 = BOOM.. and a bonus rt_mutex deadlock report for absolutely free!
Date: Mon, 16 Jul 2012 18:36:07 +0200 [thread overview]
Message-ID: <1342456567.7659.97.camel@marge.simpson.net> (raw)
In-Reply-To: <1342455968.7659.93.camel@marge.simpson.net>
On Mon, 2012-07-16 at 18:26 +0200, Mike Galbraith wrote:
> On Mon, 2012-07-16 at 12:02 -0400, Steven Rostedt wrote:
> > On Mon, 2012-07-16 at 04:02 +0200, Mike Galbraith wrote:
> >
> > > > Great, thanks! I got stuck in bug land on Friday. You mentioned
> > > > performance problems earlier on Saturday, did this improve performance?
> > >
> > > Yeah, the read_trylock() seems to improve throughput. That's not
> > > heavily tested, but it certainly looks like it does. No idea why.
> >
> > Ouch, you just turned the rt_read_lock() into a spin lock. If a higher
> > priority process preempted a lower priority process that holds the same
> > lock, it will deadlock.
>
> Hm, how, it's doing cpu_chill()?
'course PI is toast, so *poof*. Since just enabling the lockdep bits
seems to fix it up, maybe that's the patchlet to submit (less is more).
-Mike
next prev parent reply other threads:[~2012-07-16 16:36 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-12 5:47 3.4.4-rt13: btrfs + xfstests 006 = BOOM.. and a bonus rt_mutex deadlock report for absolutely free! Mike Galbraith
2012-07-12 8:44 ` Mike Galbraith
2012-07-12 9:53 ` Mike Galbraith
2012-07-12 11:43 ` Thomas Gleixner
2012-07-12 11:57 ` Mike Galbraith
2012-07-12 13:31 ` Thomas Gleixner
2012-07-12 13:37 ` Mike Galbraith
2012-07-12 13:43 ` Thomas Gleixner
2012-07-12 13:48 ` Mike Galbraith
2012-07-12 13:51 ` Mike Galbraith
2012-07-13 6:31 ` Mike Galbraith
2012-07-13 9:52 ` Thomas Gleixner
2012-07-13 10:14 ` Mike Galbraith
2012-07-13 10:26 ` Thomas Gleixner
2012-07-13 10:47 ` Chris Mason
2012-07-13 12:50 ` Mike Galbraith
2012-07-12 11:07 ` Thomas Gleixner
2012-07-12 17:09 ` Chris Mason
2012-07-13 10:04 ` Thomas Gleixner
2012-07-13 12:50 ` Chris Mason
2012-07-13 14:47 ` Thomas Gleixner
2012-07-14 10:14 ` Mike Galbraith
2012-07-15 17:56 ` Chris Mason
2012-07-16 2:02 ` Mike Galbraith
2012-07-16 16:02 ` Steven Rostedt
2012-07-16 16:26 ` Mike Galbraith
2012-07-16 16:35 ` Chris Mason
2012-07-16 16:36 ` Mike Galbraith [this message]
2012-07-16 17:03 ` Steven Rostedt
2012-07-17 4:18 ` Mike Galbraith
2012-07-17 4:27 ` Steven Rostedt
2012-07-17 4:34 ` Steven Rostedt
2012-07-17 4:46 ` Mike Galbraith
2012-07-17 4:44 ` Mike Galbraith
2012-07-17 12:54 ` Mike Galbraith
2012-07-16 10:55 ` Mike Galbraith
2012-07-16 15:43 ` Chris Mason
2012-07-16 16:16 ` Mike Galbraith
2012-07-14 13:38 ` Mike Galbraith
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