linux-kernel - Re: Bug in scheduler when using rt

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Date:	Wed, 19 Jan 2011 11:38:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	samu.p.onkalo@...ia.com, mingo@...e.hu,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	tglx <tglx@...utronix.de>
Subject: Re: Bug in scheduler when using rt_mutex

On Wed, 2011-01-19 at 10:44 +0100, Peter Zijlstra wrote:
> +static void
> +switched_from_fair(struct rq *rq, struct task_struct *p, int running)
> +{
> +       struct sched_entity *se = &p->se;
> +       struct cfs_rq *cfs_rq = cfs_rq_of(se);
> +
> +       if (!se->on_rq && p->state != TASK_RUNNING)
> +               se->vruntime -= cfs_rq->min_vruntime;
> +}
> +
>  /*
>   * We switched to the sched_fair class.
>   */
> -static void switched_to_fair(struct rq *rq, struct task_struct *p,
> -                            int running)
> +static void
> +switched_to_fair(struct rq *rq, struct task_struct *p, int running)
>  {
> +       struct sched_entity *se = &p->se;
> +       struct cfs_rq *cfs_rq = cfs_rq_of(se);
> +
> +       if (se->on_rq && cfs_rq->curr != se)
> +               __dequeue_entity(cfs_rq, se);
> +
> +       se->vruntimea += cfs_rq->min_vruntime;
> +
> +       if (se->on_rq && cfs_rq->curr != se)
> +               __enqueue_entity(cfs_rq, se);
> +
>         /*
>          * We were most likely switched from sched_rt, so
>          * kick off the schedule if running, otherwise just see 

Hrm, I think the to bit is not needed with the from thing in place, the
enqueue from _setprio will already have added min_vruntime
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