linux-kernel - Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]

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Date:	Sat, 08 Dec 2007 09:10:48 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]

On 12/07/2007 06:51 PM, Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
>> thanks for tracking it down. Does the patch below help?
> 
> oops, that should be the patch below. Otherwise the watchdog kernel 
> threads will just loop around.
> 
> 	Ingo
> 
> ---
>  kernel/softlockup.c |    9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> Index: linux/kernel/softlockup.c
> ===================================================================
> --- linux.orig/kernel/softlockup.c
> +++ linux/kernel/softlockup.c
> @@ -101,7 +101,11 @@ void softlockup_tick(void)
>  
>  	now = get_timestamp(this_cpu);
>  
> -	/* Warn about unreasonable delays: */
> +	/* Wake up the high-prio watchdog task every second: */
> +	if (now > (touch_timestamp + 1))
> +		wake_up_process(per_cpu(watchdog_task, this_cpu));
> +
> +	/* Warn about unreasonable 10+ seconds delays: */
>  	if (now <= (touch_timestamp + softlockup_thresh))
>  		return;
>  
> @@ -213,8 +217,9 @@ static int watchdog(void *__bind_cpu)
>  	 * debug-printout triggers in softlockup_tick().
>  	 */
>  	while (!kthread_should_stop()) {
> +		set_current_state(TASK_INTERRUPTIBLE);
>  		touch_softlockup_watchdog();
> -		msleep_interruptible(10000);
> +		schedule();
>  
>  		/*
>  		 * Only do the hung-tasks check on one CPU:

Unfortunately no change here.
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