sched: Reorder root_domain to remove 64 bit alignment padding
Richard Kennedy [Fri, 15 Jul 2011 10:41:31 +0000 (11:41 +0100)]
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>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1310726492.1977.5.camel@castor.rsk
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/sched.c

index f107204..e3f0bac 100644 (file)
@@ -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;
 };