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

Revelation from Peter. Cc: Peter Zijlstra <[email protected]> Cc: Don Zickus <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Thomas Gleixner <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
franciscofranco · Mar 23, 2012 · b60f796 · b60f796
1 parent 4501980
commit b60f796
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
@@ -349,6 +349,10 @@ static int watchdog(void *unused)
 
 		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;