linux-kernel - Re: Problem with freezable workqueues

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Message-Id: <200702280100.36649.rjw@sisk.pl>
Date:	Wed, 28 Feb 2007 01:00:35 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Oleg Nesterov <oleg@...sign.ru>, Pavel Machek <pavel@....cz>,
	Gautham R Shenoy <ego@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>
Subject: Re: Problem with freezable workqueues

On Wednesday, 28 February 2007 00:36, Johannes Berg wrote:
> On Wed, 2007-02-28 at 02:28 +0300, Oleg Nesterov wrote:
> 
> > Ugh. I know nothing, nothing, nothing about suspend. I'll try to guess.
> > 
> >    Commit: ed746e3b18f4df18afa3763155972c5835f284c5
> 
> > Yes? with the patch above, _cpu_down() called _after_ freeze_processes() ???
> 
> perfect :)
> See also my original mail and the thread:
> http://thread.gmane.org/gmane.linux.power-management.general/4314
> 
> > How about other kthread_stop()s ? For example, kernel/softirq.c:cpu_callback() ?
> 
> I'd they should be affected as well.

They won't be, if they have PF_NOFREEZE set.

> For me, I guess I haven't run into them because xfs is enough to freeze the
> box ;)

I think you've hit the only thing that could have triggered the issue. ;-)

Greetings,
Rafael
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