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items: [PATCH] sched: don't call task_group() many times in set_task_rq()
items: Re: [PATCH] sched: don't call task_group() many times in set_task_rq()

[PATCH] sched: don't call task_group() many times in set_task_rq()
type: item
description: It improves perfomance, especially if autogroup enabled. The size of set_task_rq() was 0x180 and now it is 0xa0. Signed-off-by: Andrew Vagin <avagin@openvz.org> --- kernel/sched.c | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index d87c6e5..a740eec 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -766,14 +766,18 @@ 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 } -- 1.7.1
creator: Andrew Vagin
date: 2011-11-11T14:04:00-00:00

Re: [PATCH] sched: don't call task_group() many times in set_task_rq()
type: item
description: On Fri, 2011-11-11 at 13:26 -0800, Paul Turner wrote: > Signed-off-by: Paul Turner <pjt@google.com> I'll take that as Acked-by, ok?
creator: Peter Zijlstra
date: 2011-11-12T09:21:58-00:00