The commit is pushed to "branch-rh7-3.10.0-229.7.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-229.7.2.vz7.6.9
------>
commit 1c12b1b1990e17c04fb09de7d2728d7f3a383b6c
Author: Kirill Tkhai <[email protected]>
Date: Thu Sep 24 13:22:07 2015 +0400
sched/fair: Optimize is_top_cfs_rq()
Replace 5 loads with 2 loads.
May look strange, but this improves average results of
at_thread_ctxswitch_pipe test about 1%.
https://jira.sw.ru/browse/PSBM-35251
Signed-off-by: Kirill Tkhai <[email protected]>
Reviewed-by: Vladimir Davydov <[email protected]>
---
kernel/sched/fair.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8bc8c0fb0ce8..ece14a41cb96 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -267,10 +267,9 @@ static inline struct cfs_rq *group_cfs_rq(struct
sched_entity *grp)
static inline bool is_top_cfs_rq(struct cfs_rq *cfs_rq)
{
- struct sched_entity *se;
+ struct task_group *tg = cfs_rq->tg;
- se = cfs_rq->tg->se[cpu_of(rq_of(cfs_rq))];
- return se && !se->parent;
+ return tg->parent == &root_task_group;
}
static inline struct cfs_rq *top_cfs_rq_of(struct sched_entity *se)
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