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softlockup: fix watchdog task wakeup frequency 

Updating the timestamp more often is pointless as we print the warnings
only if we exceed the threshold.  And the check for hung tasks relies on
the last timestamp, so it will keep working correctly, too.

Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Johannes Weiner 2008-06-27 15:07:21 +02:00 committed by Ingo Molnar
parent 8d5be7f4e8
commit dd7a1e5615
1 changed files with 5 additions and 2 deletions
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7
kernel/softlockup.c
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@ -130,8 +130,11 @@ void softlockup_tick(void)
now = get_timestamp(this_cpu);
/* Wake up the high-prio watchdog task every second: */
if (now > (touch_timestamp + 1))
/*
* Wake up the high-prio watchdog task twice per
* threshold timespan.
*/
if (now > touch_timestamp + softlockup_thresh/2)
wake_up_process(per_cpu(watchdog_task, this_cpu));
/* Warn about unreasonable delays: */