linux-kernel - Re: Problem with freezable workqueues

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Message-Id: <200702281211.04515.rjw@sisk.pl>
Date:	Wed, 28 Feb 2007 12:11:03 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	vatsa@...ibm.com
Cc:	Pavel Machek <pavel@....cz>, Gautham R Shenoy <ego@...ibm.com>,
	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: Problem with freezable workqueues

On Wednesday, 28 February 2007 04:51, Srivatsa Vaddagiri wrote:
> On Wed, Feb 28, 2007 at 08:31:13AM +0530, Srivatsa Vaddagiri wrote:
> > This problem (of kthread_stopping a frozen thread) was there when we
> > implemented freezer-based cpu hotplug. We worked around that in the
> > callbacks by thawing the worker thread first before kthread_stopping it,
> > which is working pretty neatly.
> > 
> > Should that fix the issue? 
> 
> In addition to thawing worker thread before kthread_stopping it, there
> are minor changes required in worker threads, to check for
> is_cpu_offline(bind_cpu) when they come out of refrigerator and jump to
> wait_to_die if so (ex: softirq.c).
> 
> I guess you would need these changes before freezer-based hotplug is
> merged, in which case Gautham can send those patches out first.

Yes, please, if that's possible.
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