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Date: Fri, 7 Dec 2007 18:51:34 +0100 From: Ingo Molnar <mingo@...e.hu> To: Jiri Slaby <jirislaby@...il.com> 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] * 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: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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