linux-kernel - [tip:sched/core] sched: Reorder root_domain to remove 64 bit alignment padding

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Date:	Thu, 21 Jul 2011 18:30:39 GMT
From:	tip-bot for Richard Kennedy <richard@....demon.co.uk>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, richard@....demon.co.uk,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Reorder root_domain to remove 64 bit alignment padding

Commit-ID:  26a148eb9c790149750f7e77da0d96029443d400
Gitweb:     http://git.kernel.org/tip/26a148eb9c790149750f7e77da0d96029443d400
Author:     Richard Kennedy <richard@....demon.co.uk>
AuthorDate: Fri, 15 Jul 2011 11:41:31 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 21 Jul 2011 18:01:52 +0200

sched: Reorder root_domain to remove 64 bit alignment padding

Reorder root_domain to remove 8 bytes of alignment padding on 64 bit
builds, this shrinks the size from 1736 to 1728 bytes, therefore using
one fewer cachelines.

Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1310726492.1977.5.camel@castor.rsk
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index f107204..e3f0bac 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -422,6 +422,7 @@ struct rt_rq {
  */
 struct root_domain {
 	atomic_t refcount;
+	atomic_t rto_count;
 	struct rcu_head rcu;
 	cpumask_var_t span;
 	cpumask_var_t online;
@@ -431,7 +432,6 @@ struct root_domain {
 	 * one runnable RT task.
 	 */
 	cpumask_var_t rto_mask;
-	atomic_t rto_count;
 	struct cpupri cpupri;
 };
 
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