commit 099aa69b9cfb6f4c5b56dd1d1d06ce9ef92cf2d5
author Steve Muckle <smuckle@codeaurora.org> Tue Feb 28 14:07:39 2012 -0800
committer Steve Muckle <smuckle@codeaurora.org> Mon Mar 19 17:32:55 2012 -0700
tree 8b86f82df11e296f1d528cce1bdba7cfec5dbe54
parent cf76837260758073496ce6325bcb20e657eb2066

kernel: reduce sleep duration in wait_task_inactive

Sleeping for an entire tick adds unnecessary latency to
hotplugging a cpu (cpu_up).

Change-Id: Iab323a79f4048bc9101ecfd368e0f275827ed4ab
Signed-off-by: Steve Muckle <smuckle@codeaurora.org>

kernel/sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index b85f675..1e633e6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2324,7 +2324,7 @@
 		 * yield - it could be a while.
 		 */
 		if (unlikely(on_rq)) {
-			ktime_t to = ktime_set(0, NSEC_PER_SEC/HZ);
+			ktime_t to = ktime_set(0, NSEC_PER_MSEC);
 
 			set_current_state(TASK_UNINTERRUPTIBLE);
 			schedule_hrtimeout(&to, HRTIMER_MODE_REL);