Messages in this thread | | | Date | Thu, 20 Jan 2011 12:18:14 +0800 | Subject | Re: Bug in scheduler when using rt_mutex | From | Yong Zhang <> |
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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
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