linux-kernel - Re: [Suspend2-devel] Problem with CFS V20 and Suspend2/tuxonice

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Date:	Mon, 27 Aug 2007 14:25:47 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Ingo Molnar <mingo@...e.hu>, Matthias Hensler <matthias@...se.de>,
	Christian Hesse <mail@...thworm.de>,
	suspend2-devel@...ts.tuxonice.net,
	Suspend2-users@...ts.suspend2.net, linux-kernel@...r.kernel.org,
	suspend2-devel <suspend2-devel@...ts.suspend2.net>,
	David Rodriguez <livuxman@...il.com>
Subject: Re: [Suspend2-devel] Problem with CFS V20 and Suspend2/tuxonice

On Monday, 27 August 2007 13:41, Pavel Machek wrote:
> Hi!
> 
> > > > Same problem here: Core Duo, Kernel 2.6.22.5, Suspend 2.2.10, CFS 
> > > > v20.2.
> > > 
> > > Me too for 2.6.22.5, TuxOnIce 2.2.10 and Centrino based notebook.
> > 
> > possible bugfix below.
> > 
> > 	Ingo
> > 
> > Index: linux-cfs-2.6.22.5.q/kernel/sched.c
> > ===================================================================
> > --- linux-cfs-2.6.22.5.q.orig/kernel/sched.c
> > +++ linux-cfs-2.6.22.5.q/kernel/sched.c
> > @@ -5043,6 +5043,8 @@ static int migration_thread(void *data)
> >  		struct migration_req *req;
> >  		struct list_head *head;
> >  
> > +		try_to_freeze();
> > +
> >  		spin_lock_irq(&rq->lock);
> >  
> >  		if (cpu_is_offline(cpu)) {
> 
> If it is NONFREEZE, you should not be trying to freeze it.
> 
> > @@ -5399,6 +5401,7 @@ migration_call(struct notifier_block *nf
> >  		p = kthread_create(migration_thread, hcpu, "migration/%d", cpu);
> >  		if (IS_ERR(p))
> >  			return NOTIFY_BAD;
> > +		p->flags |= PF_NOFREEZE;
> >  		kthread_bind(p, cpu);
> >  		/* Must be high prio: stop_machine expects to yield to it. */
> >  		rq = task_rq_lock(p, &flags);
> 
> ...plus I believe are tasks are nonfreezable by default now...? Or is
> that only in 2.6.23?

Yes, only in 2.6.23-rc.

Greetings,
Rafael
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