From a3e5d1091c1298ded486aba87c22fe90cb55ea6c Mon Sep 17 00:00:00 2001 From: Andrew Vagin Date: Fri, 11 Nov 2011 17:04:00 +0300 Subject: [PATCH] sched: Don't call task_group() too many times in set_task_rq() It improves perfomance, especially if autogroup is enabled. The size of set_task_rq() was 0x180 and now it is 0xa0. Signed-off-by: Andrew Vagin Acked-by: Paul Turner Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1321020240-3874331-1-git-send-email-avagin@openvz.org Signed-off-by: Ingo Molnar --- kernel/sched.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index 0df69866a04e..c9e3ab6e299e 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -793,14 +793,18 @@ static inline struct task_group *task_group(struct task_struct *p) /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { +#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) + struct task_group *tg = task_group(p); +#endif + #ifdef CONFIG_FAIR_GROUP_SCHED - p->se.cfs_rq = task_group(p)->cfs_rq[cpu]; - p->se.parent = task_group(p)->se[cpu]; + p->se.cfs_rq = tg->cfs_rq[cpu]; + p->se.parent = tg->se[cpu]; #endif #ifdef CONFIG_RT_GROUP_SCHED - p->rt.rt_rq = task_group(p)->rt_rq[cpu]; - p->rt.parent = task_group(p)->rt_se[cpu]; + p->rt.rt_rq = tg->rt_rq[cpu]; + p->rt.parent = tg->rt_se[cpu]; #endif } -- 2.20.1