[PATCH 09/13] RT: Only dirty a cacheline if the priority is actuallychanging

[Gregory Haskins]

We can avoid dirtying a rq related cacheline with a simple check, so why not.

Signed-off-by: Gregory Haskins <ghaskins@xxxxxxxxxx>
---

 kernel/sched.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index e536142..1058a1f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -376,7 +376,8 @@ static inline void update_rq_prio(struct rq *rq)
 	struct rt_prio_array *array = &rq->rt.active;
 	int                   prio  = sched_find_first_bit(array->bitmap);
 
-	set_rq_prio(rq, prio);
+	if (rq->highest_prio != prio)
+		set_rq_prio(rq, prio);
 }
 
 #else

-
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