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

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Date:	Sat, 25 Aug 2007 22:15:20 +0200
From:	"David Rodriguez" <livuxman@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Problem with CFS V20 and Suspend2/tuxonice

2007/8/25, Ingo Molnar <mingo@...e.hu>:
>
> * David Rodriguez <livuxman@...il.com> wrote:
>
> > I'm using 2.6.22.5 with cfs v20.3 and suspend2 2.2.10.2. With that
> > combination, suspend is not working anymore (with cfs v19 was
> > working). Stops on suspend in "Suspending tasks" Looking at cfs patch,
> > I managed to change the migration_thread, adding again the
> > try_to_freeze() removed in last patch and now the suspend finished,
> > but resume not work. Of course I don't know why that was removed, and
> > rewriting it is not a solution, but I want to report it.
>
> could you try the patch below, does it fix this problem?
>
>         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)) {
> @@ -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);
>



Yes, it fixes the problem. Thanks
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