linux-kernel - Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)

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Date:	Fri, 1 Feb 2008 23:48:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Steven Rostedt <srostedt@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] 2.6.24-git3: Major annoyance during
	suspend/hibernation on x86-64 (bisected)


* Dmitry Adamushko <dmitry.adamushko@...il.com> wrote:

> > I've observed delays from ~3 s. up to ~8 s. (out of ~20 tests) so 
> > the 10s. delay of msleep_interruptible() might be related but I'm 
> > still looking for the reason why this fix helps (and what goes wrong 
> > with the current code).
> 
> heh... it's pretty obvious indeed. What's msleep_interruptible() is 
> all about? :-)
> 
> "sleep waiting for signals"
> 
> so the 'watchdog' thread gets woken up
> 
> [ as a result of cpu_callback(action = CPU_DEAD) --> kthread_stop() ]
> 
> just to be immediately scheduled out again for as long as the
> remaining timeout > 0.
> 
> So it should work if we substitute msleep_interruptible() with 
> schedule_timeout_interruptible().

Doh. Could someone with ths problem please test the patch below, does it 
do the trick?

	Ingo

---
 kernel/softlockup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/kernel/softlockup.c
===================================================================
--- linux.orig/kernel/softlockup.c
+++ linux/kernel/softlockup.c
@@ -228,7 +228,7 @@ static int watchdog(void *__bind_cpu)
 	 */
 	while (!kthread_should_stop()) {
 		touch_softlockup_watchdog();
-		msleep_interruptible(10000);
+		schedule_timeout_interruptible(10*HZ);
 
 		if (this_cpu != check_cpu)
 			continue;
--
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