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Message-ID: <20071023165109.5536.40755.stgit@novell1.haskins.net>
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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