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Message-ID: <20070419144844.GH32602149@melbourne.sgi.com>
Date: Fri, 20 Apr 2007 00:48:44 +1000
From: David Chinner <dgc@....com>
To: Ingo Molnar <mingo@...e.hu>
Cc: Jarek Poplawski <jarkao2@...pl>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] workqueue: debug possible endless loop in cancel_rearming_delayed_work
On Thu, Apr 19, 2007 at 09:32:22AM +0200, Ingo Molnar wrote:
>
> * Jarek Poplawski <jarkao2@...pl> wrote:
>
> > + int i = 1000;
> >
> > - while (!cancel_delayed_work(dwork))
> > + while (!cancel_delayed_work(dwork)) {
> > flush_workqueue(wq);
> > + BUG_ON(!i--);
> > + }
>
> if then make it a WARN_ON(). But ... dont we have the softlockup
> detector for such cases? Does CONFIG_DETECT_SOFTLOCKUP=y give you enough
> information?
No, you won't get a soft lockup - flush_workqueue() has a
schedule() call in the middle of it.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
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