[RFC][PATCH 01/10] sched: Change rt_task(prev) in pre_schedule_rt to likely

[Steven Rostedt]

From: Steven Rostedt <srostedt@xxxxxxxxxx>

As found with the branch annotation profiler, the unlikely(rt_task(prev))
in pre_schedule_rt() is always wrong. In fact it should be likely due to
the fact that we got to this function because we used prev's scheduling
class (which had to be rt).

Change the unlikely(rt_task(prev)) to likely(rt_task(prev))

Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Gregory Haskins <ghaskins@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 kernel/sched_rt.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index bea7d79..7a5c4db 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1474,7 +1474,7 @@ skip:
 static void pre_schedule_rt(struct rq *rq, struct task_struct *prev)
 {
 	/* Try to pull RT tasks here if we lower this rq's prio */
-	if (unlikely(rt_task(prev)) && rq->rt.highest_prio.curr > prev->prio)
+	if (likely(rt_task(prev)) && rq->rt.highest_prio.curr > prev->prio)
 		pull_rt_task(rq);
 }
 
-- 
1.7.2.3


--
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/