Commit a3e5d109 authored by Andrew Vagin's avatar Andrew Vagin Committed by Ingo Molnar
Browse files

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: default avatarAndrew Vagin <avagin@openvz.org>
Acked-by: default avatarPaul Turner <pjt@google.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1321020240-3874331-1-git-send-email-avagin@openvz.org


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f4d6f6c2

kernel/sched.c

+8 −4
Original line number Diff line number Diff line
@@ -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

}

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