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

[Gautham R Shenoy <ego@in.ibm.com>]

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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