Messages in this thread | | | Date | Tue, 4 Aug 2015 09:41:16 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency mask model |
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On Mon, Aug 03, 2015 at 07:30:32PM +0200, Frederic Weisbecker wrote: > > But you've forgotten about SCHED_DEADLINE, we count those in: > > rq->dl.dl_nr_running. > > Indeed. Hmm, there is no preemption between SCHED_DEALINE tasks, right? > So I can treat it like SCHED_FIFO.
Sadly no. Even though EDF has static job priority (once a job is activated its priority doesn't change anymore) DEADLINE also has a CBS component and that needs the tick regardless, even with a single task.
So any deadline task running means we cannot stop the tick.
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