linux-kernel - Re: Problem with freezable workqueues

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Message-Id: <200702282043.24779.rjw@sisk.pl>
Date:	Wed, 28 Feb 2007 20:43:23 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	vatsa@...ibm.com, Pavel Machek <pavel@....cz>,
	Gautham R Shenoy <ego@...ibm.com>,
	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Problem with freezable workqueues

On Wednesday, 28 February 2007 20:32, Oleg Nesterov wrote:
> On 02/28, Rafael J. Wysocki wrote:
> >
> > > --- workqueue.c.org	2007-02-28 18:32:48.000000000 +0530
> > > +++ workqueue.c	2007-02-28 18:44:23.000000000 +0530
> > > @@ -718,6 +718,8 @@ static void cleanup_workqueue_thread(str
> > >  		insert_wq_barrier(cwq, &barr, 1);
> > >  		cwq->should_stop = 1;
> > >  		alive = 1;
> > > +		if (frozen(cwq->thread))
> > > +			thaw(cwq->thread);
> > >  	}
> > >  	spin_unlock_irq(&cwq->lock);
> >
> > Unfortunately, the above code is mm-only.  Is the analogous fix for 2.6.21-rc2
> > viable?
> 
> I am sorry, I lost track of this problem. As for 2.6.21, create_freezeable_workqueue
> doesn't work and conflict with suspend. Why can't we remove it from XFS as you
> suggested before?

Yes, we can (preparing a patch).  I was just curious. :-)

Rafael
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