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

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Message-ID: <20070827114120.GA1797@elf.ucw.cz>
Date:	Mon, 27 Aug 2007 13:41:20 +0200
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [Suspend2-devel] Problem with CFS V20 and Suspend2/tuxonice

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?
									Pavel


-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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