From dd7a1e5615b1719c0fdffee1ea5a7820ac8141a6 Mon Sep 17 00:00:00 2001
From: Johannes Weiner <hannes@saeurebad.de>
Date: Fri, 27 Jun 2008 15:07:21 +0200
Subject: 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>
---
 kernel/softlockup.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'kernel')

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 97977ecc3171..d53ab702a7db 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -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: */
-- 
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