commit b60f796c4ca72545327a069f12938360d833cce7
author Andrew Morton <akpm@linux-foundation.org> Fri Mar 23 15:01:56 2012 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Fri Mar 23 16:58:32 2012 -0700
tree dea778b974b2a1396cd85a582557e273cb151b2c
parent 4501980aae221ed8120dee3491f799ecd75187ad

kernel/watchdog.c: add comment to watchdog() exit path

Revelation from Peter.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@tglx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/watchdog.c

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index a01cb03..df30ee0 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -349,6 +349,10 @@
 
 		set_current_state(TASK_INTERRUPTIBLE);
 	}
+	/*
+	 * Drop the policy/priority elevation during thread exit to avoid a
+	 * scheduling latency spike.
+	 */
 	__set_current_state(TASK_RUNNING);
 	sched_setscheduler(current, SCHED_NORMAL, &param);
 	return 0;