linux-kernel - [patch] sched: align rq to cacheline boundary

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Message-ID: <20070409180853.GC3948@linux-os.sc.intel.com>
Date:	Mon, 9 Apr 2007 11:08:53 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	akpm@...ux-foundation.org
Cc:	mingo@...e.hu, nickpiggin@...oo.com.au,
	linux-kernel@...r.kernel.org, suresh.b.siddha@...el.com
Subject: [patch] sched: align rq to cacheline boundary

Align the per cpu runqueue to the cacheline boundary. This will minimize the
number of cachelines touched during remote wakeup.

Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index b9a6837..eca33c5 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -278,7 +278,7 @@ struct rq {
 	struct lock_class_key rq_lock_key;
 };
 
-static DEFINE_PER_CPU(struct rq, runqueues);
+static DEFINE_PER_CPU(struct rq, runqueues) ____cacheline_aligned_in_smp;
 
 static inline int cpu_of(struct rq *rq)
 {
-
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