linux-kernel - Re: [PATCH] kthread: Don't depend on work queues

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Message-Id: <200704111644.53280.rjw@sisk.pl>
Date:	Wed, 11 Apr 2007 16:44:52 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	ego@...ibm.com
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Robin Holt <holt@....com>, Roland McGrath <roland@...hat.com>,
	"Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org,
	vatsa@...ibm.com
Subject: Re: [PATCH] kthread: Don't depend on work queues

On Wednesday, 11 April 2007 15:31, Gautham R Shenoy wrote:
> On Wed, Apr 11, 2007 at 03:48:05PM +0400, Oleg Nesterov wrote:
> > On 04/11, Gautham R Shenoy wrote:
> > >
> > > On Wed, Apr 11, 2007 at 12:13:34PM +0200, Rafael J. Wysocki wrote:
> > > > 
> > > > It should be calling try_to_freeze() somewhere anyway.  We may need to freeze
> > > > all tasks in some cases.
> > > 
> > > How about
> > > for (;;) {
> > > 	try_to_freeze();
> > > 
> > > ?
> > 
> > Why?
> 
> If some event (defintely NOT cpu hotplug) needs this thread frozen.

I didn't mean the CPU hotplug too, BTW, but I'm considering freezing all tasks
at the late stage of suspend (ie. after freezing devices).

Greetings,
Rafael
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