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

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Date:	Sat, 25 Aug 2007 21:01:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Rodriguez <livuxman@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Problem with CFS V20 and Suspend2/tuxonice


* 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);
-
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