Messages in this thread | | | Date | Tue, 4 Nov 2014 16:46:23 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH RFC] sched/deadline: support dl task migrate during cpu hotplug |
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On Tue, Nov 04, 2014 at 09:30:46PM +0800, Wanpeng Li wrote:
> + if (!rq->online) { > + struct rq *latest_rq = NULL; > + int cpu; > + u64 dmin = LONG_MAX; > + > + for_each_cpu(cpu, &p->cpus_allowed) > + if (cpu_online(cpu) && > + cpu_rq(cpu)->dl.earliest_dl.curr < dmin) { > + latest_rq = cpu_rq(cpu); > + dmin = latest_rq->dl.earliest_dl.curr; > + }
I would have expected something using find_later_rq(), but I might be mistaken, I'll let Juri suggest something.
> + > + if (!latest_rq) > + goto unlock; > + > + raw_spin_lock(&latest_rq->lock); > + > + deactivate_task(rq, p, 0); > + set_task_cpu(p, latest_rq->cpu); > + activate_task(latest_rq, p, 0); > + > + raw_spin_unlock(&latest_rq->lock); > + } > + > unlock: > raw_spin_unlock(&rq->lock);
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