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

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Message-ID: <20070411133139.GB10623@in.ibm.com>
Date:	Wed, 11 Apr 2007 19:01:39 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 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.

> 
> > This change allows us to make all the worker threads freezeable by default.
> > >From cpu-hotplug perspective, helper_wq was the only singlethreaded
> > non-freezeable workqueue.
> 
> I think Eric's patch is what you need. We should _not_ freeze kthreadd(), we
> need kthread_create() after freezing. Now it doesn't depend on workqueues, we
> can freeze them all, single-thread or not.
> 

These were my exact thoughts. 

> I like this patch.

Same here. 

> 
> Oleg.
> 

Thanks and Regards
gautham.

-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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