linux-kernel - Re: [patch] Re: autogroup: sched

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Message-ID: <AANLkTikO8kaWk=PL5F76pUc_ihV0w-vAU2NYvPcc1XUZ@mail.gmail.com>
Date:	Wed, 12 Jan 2011 13:43:17 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Mike Galbraith <efault@....de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	bharata@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] Re: autogroup: sched_setscheduler() fails

On Tue, Jan 11, 2011 at 12:42 AM, Mike Galbraith <efault@....de> wrote:
> Index: linux-2.6/kernel/sched_autogroup.c
> ===================================================================
> --- linux-2.6.orig/kernel/sched_autogroup.c
> +++ linux-2.6/kernel/sched_autogroup.c
> @@ -73,6 +73,15 @@ static inline struct autogroup *autogrou
>        ag->id = atomic_inc_return(&autogroup_seq_nr);
>        ag->tg = tg;
>        tg->autogroup = ag;
> +#ifdef CONFIG_RT_GROUP_SCHED
> +       /*
> +        * HACK: autogroup RT tasks run in the root task group.
> +        * This fools __sched_setscheduler() into proceeding on
> +        * so we can move the task to the appropriate runqueue
> +        * upon scheduling policy change.
> +        */
> +       tg->rt_bandwidth.rt_runtime = RUNTIME_INF;
> +#endif
>
>        return ag;
>
> @@ -143,6 +152,15 @@ autogroup_move_group(struct task_struct
>        autogroup_kref_put(prev);
>  }
>
> +static inline void
> +autogroup_setscheduler(struct task_struct *p, int on_rq)
> +{
> +       if (p->sched_class->task_move_group)
> +               p->sched_class->task_move_group(p, on_rq);

This will be called even if we don't change the sched_class in
which case it is not necessary.

Thanks,
Yong

-- 
Only stand for myself
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