From: Richard Kennedy <richard@rsk.demon.co.uk>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: [PATCH] sched: reorder root_domain to remove 64 bit alignment padding
Date: Fri, 15 Jul 2011 11:41:31 +0100 [thread overview]
Message-ID: <1310726492.1977.5.camel@castor.rsk> (raw)
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@rsk.demon.co.uk>
---
patch against v3.0-rc7
compiled & booted on x86_64.
I've been running this patch for 2 days without any obvious problems,
but I don't have any specific RT test cases.
regards
Richard
diff --git a/kernel/sched.c b/kernel/sched.c
index 9769c75..4ecf9db 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;
};
next reply other threads:[~2011-07-15 10:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-15 10:41 Richard Kennedy [this message]
2011-07-15 10:44 ` [PATCH] sched: reorder root_domain to remove 64 bit alignment padding Peter Zijlstra
2011-07-15 11:23 ` Richard Kennedy
2011-07-15 18:59 ` Henrique de Moraes Holschuh
2011-07-21 18:30 ` [tip:sched/core] sched: Reorder " tip-bot for Richard Kennedy
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