Messages in this thread |  | | | Date | Wed, 4 Apr 2007 16:04:02 +0200 | | From | "Dmitry Adamushko" <> | | Subject | [sched] redundant reschedule when set_user_nice() boosts a prio of a task from the "expired" array |
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Hello,
Scenario:
Currently running [task1] boosts a priority (lowers a static_prio) of [task2] via { setpriority -> set_user_nice } and [task2] happens to be in the "expired" array at the moment. According to the set_user_nice(), "delta" is negative (the prio is boosted) and, hence, resched_task(rq->curr) is called.
As the [task2] is in the "expired" array and there are still tasks (at least [task1]) in the "active" one, the triggered reschedule is just useless (e.g. gets control back to [task1]).
Am I missing something?
The same is applicable to rt_mutex_setprio().
Of course, not a big deal, but it's easily avoidable, e.g. (delta < 0 && array == rq->active).
Thanks in advance for any comments.
-- Best regards, Dmitry Adamushko - 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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