[PATCH 5/7] sched: rt-group: reduce rescheduling

From: Peter Zijlstra
Date: Fri Jan 04 2008 - 08:56:53 EST


Only reschedule if the new group has a higher prio task.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
kernel/sched_rt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6/kernel/sched_rt.c
===================================================================
--- linux-2.6.orig/kernel/sched_rt.c
+++ linux-2.6/kernel/sched_rt.c
@@ -94,8 +94,11 @@ static void sched_rt_ratio_enqueue(struc
struct sched_rt_entity *rt_se = rt_rq->rt_se;

if (rt_se && !on_rt_rq(rt_se) && rt_rq->rt_nr_running) {
+ struct task_struct *curr = rq_of_rt_rq(rt_rq)->curr;
+
enqueue_rt_entity(rt_se);
- resched_task(rq_of_rt_rq(rt_rq)->curr);
+ if (rt_rq->highest_prio < curr->prio)
+ resched_task(curr);
}
}


--

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/