linux-kernel - [PATCH 09/13] RT: Only dirty a cacheline if the priority is actually changing

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Date:	Tue, 23 Oct 2007 12:51:09 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	linux-rt-users@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Gregory Haskins <ghaskins@...ell.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Darren Hart <dvhltc@...ibm.com>
Subject: [PATCH 09/13] RT: Only dirty a cacheline if the priority is actually
	changing

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

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 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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