Messages in this thread | | | From | "Mitchell Erblich" <> | Subject | Question: RT schedular : task_tick_rt(struct rq *rq, struct task_struct *p) : decreases overhead when rq->nr_running == 1 | Date | Tue, 7 Aug 2007 15:54:41 -0700 |
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Ingo Molnar and group,
If their is a single RT task on this rq, then why not just reset the timeslice and return??? Just MAYBE decreasing re-scheduling overhead..
Thus,,,,
After p->time_slice = static_prio_timeslice(p->static_prio);
Why isn't their a check like if (rq->nr_running == 1) return;
Which world remove the need for any recheduling or requeue'ing...
Mitchell Erblich FYI: below is believed to be a snap of the current/ orig func -----------------------------
+static void task_tick_rt(struct rq *rq, struct task_struct *p) +{ + /* + * RR tasks need a special form of timeslice management. + * FIFO tasks have no timeslices. + */ + if (p->policy != SCHED_RR) + return; + + if (--p->time_slice) + return; + + p->time_slice = static_prio_timeslice(p->static_prio); + set_tsk_need_resched(p); + + /* put it at the end of the queue: */ + requeue_task_rt(rq, p); +} - 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/
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