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Date: Tue, 04 Nov 2014 15:50:32 +0000 From: Juri Lelli <juri.lelli@....com> To: Peter Zijlstra <peterz@...radead.org>, Wanpeng Li <kernellwp@...il.com> CC: Wanpeng Li <wanpeng.li@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, Kirill Tkhai <ktkhai@...allels.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "juri.lelli@...il.com" <juri.lelli@...il.com> Subject: Re: [PATCH RFC] sched/deadline: support dl task migrate during cpu hotplug Hi, On 04/11/14 15:46, Peter Zijlstra wrote: > 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. > Yeah, we should be able to reuse something that we already have. I'm actually sorry that I'm not responsive on this, but I'm really busy on other things this week. I hope to be able to find some time soon to test this all. Thanks, - Juri >> + >> + 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); > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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