linux-kernel - Re: [patch] softlockup: fix false positives on nohz if CPU is 100% idle for more than 60 seconds

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Message-ID: <20080423133656.GA23782@elte.hu>
Date:	Wed, 23 Apr 2008 15:36:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	a.p.zijlstra@...llo.nl
Subject: Re: [patch] softlockup: fix false positives on nohz if CPU is 100%
	idle for more than 60 seconds


* David Miller <davem@...emloft.net> wrote:

> > It may take some time, as each test run the verify the existence of 
> > the problem takes several minutes.
> 
> Ok, Ingo, none of your patches fix even the initial buggy changeset, 
> for reference:

as a temporary workaround please try the patch below, until we can 
reproduce and fix the bug.

	Ingo

------------------------------->
Subject: softlockup: nohz workaround
From: Ingo Molnar <mingo@...e.hu>
Date: Wed Apr 23 15:19:32 CEST 2008

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 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
@@ -245,7 +245,7 @@ static int watchdog(void *__bind_cpu)
 	 */
 	while (!kthread_should_stop()) {
 		touch_softlockup_watchdog();
-		schedule();
+		schedule_timeout(softlockup_thresh/2);
 
 		if (kthread_should_stop())
 			break;
--
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