lkml.org 
[lkml]   [2011]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: Bug in scheduler when using rt_mutex
From
On Wed, Jan 19, 2011 at 9:30 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> +static void switched_from_fair(struct rq *rq, struct task_struct *p)
> +{
> +       struct sched_entity *se = &p->se;
> +       struct cfs_rq *cfs_rq = cfs_rq_of(se);
> +
> +       /*
> +        * Ensure the task's vruntime is normalized, so that when its
> +        * switched back to the fair class the enqueue_entity(.flags=0) will
> +        * do the right thing.
> +        *
> +        * If it was on_rq, then the dequeue_entity(.flags=0) will already
> +        * have normalized the vruntime, if it was !on_rq, then only when
> +        * the task is sleeping will it still have non-normalized vruntime.
> +        */
> +       if (!se->on_rq && p->state != TASK_RUNNING)
> +               se->vruntime -= cfs_rq->min_vruntime;

Here it's possible that se->vruntime is little than cfs_rq->min_vruntime.

Thanks,
Yong

--
Only stand for myself
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-01-20 05:21    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site