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    Subject[tip:sched/core] sched: Don't call task_group() too many times in set_task_rq()
    Commit-ID:  a3e5d1091c1298ded486aba87c22fe90cb55ea6c
    Gitweb: http://git.kernel.org/tip/a3e5d1091c1298ded486aba87c22fe90cb55ea6c
    Author: Andrew Vagin <avagin@openvz.org>
    AuthorDate: Fri, 11 Nov 2011 17:04:00 +0300
    Committer: Ingo Molnar <mingo@elte.hu>
    CommitDate: Wed, 16 Nov 2011 08:48:24 +0100

    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 <avagin@openvz.org>
    Acked-by: Paul Turner <pjt@google.com>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/1321020240-3874331-1-git-send-email-avagin@openvz.org
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    ---
    kernel/sched.c | 12 ++++++++----
    1 files changed, 8 insertions(+), 4 deletions(-)

    diff --git a/kernel/sched.c b/kernel/sched.c
    index 0df6986..c9e3ab6 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
    }


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