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

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Message-ID: <20070825190223.GC15888@elte.hu>
Date:	Sat, 25 Aug 2007 21:02:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Matthias Hensler <matthias@...se.de>
Cc:	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


* Matthias Hensler <matthias@...se.de> wrote:

> > 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)) {
@@ -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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