linux-kernel - Re: Problem with freezable workqueues

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Date:	Wed, 28 Feb 2007 12:09:04 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	vatsa@...ibm.com
Cc:	Oleg Nesterov <oleg@...sign.ru>, 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 10:10, Srivatsa Vaddagiri wrote:
> On Wed, Feb 28, 2007 at 11:48:59AM +0300, Oleg Nesterov wrote:
> > On 02/28, Srivatsa Vaddagiri wrote:
> > > We can just thaw the worker thread selectively before kthread_stopping
> > > them. This will let us freeze all worker threads (which we want to for
> > > hotplug anyway).
> > 
> > I am not sure this is a good change for 2.6.21.
> 
> So we make that change when merging the freezer-based hotplug patchset?

Well, if we want to have freezable workqueues eventually, and I think we do,
they should be taken into consideration in designing this patchset, as well as
the suspend code ordering (ie. freeze_processes(SUSPEND) before
freeze_processes(CPU_HOTPLUG)).

Greetings,
Rafael
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