linux-kernel - Re: [PATCH 06/16] sched: SCHED

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Date:	Wed, 11 Apr 2012 19:48:04 +0200
From:	Juri Lelli <juri.lelli@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	peterz@...radead.org, tglx@...utronix.de, mingo@...hat.com,
	oleg@...hat.com, fweisbec@...il.com, darren@...art.com,
	johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...csson.com, liming.wang@...driver.com,
	Kirill Tkhai <tkhai@...dex.ru>
Subject: Re: [PATCH 06/16] sched: SCHED_DEADLINE push and pull logic

On 04/11/2012 07:25 PM, Steven Rostedt wrote:
> On Fri, 2012-04-06 at 09:14 +0200, Juri Lelli wrote:
>>
>>   static void set_cpus_allowed_dl(struct task_struct *p,
>> @@ -622,10 +1346,145 @@ static void set_cpus_allowed_dl(struct task_struct *p,
>>
>>   	BUG_ON(!dl_task(p));
>>
>> +	/*
>> +	 * Update only if the task is actually running (i.e.,
>> +	 * it is on the rq AND it is not throttled).
>> +	 */
>> +	if (on_dl_rq(&p->dl)&&  (weight != p->dl.nr_cpus_allowed)) {
>> +		struct rq *rq = task_rq(p);
>> +
>> +		if (!task_current(rq, p)) {
>> +			/*
>> +			 * If the task was on the pushable list,
>> +			 * make sure it stays there only if the new
>> +			 * mask allows that.
>> +			 */
>> +			if (p->dl.nr_cpus_allowed>  1)
>> +				dequeue_pushable_dl_task(rq, p);
>> +
>> +			if (weight>  1)
>> +				enqueue_pushable_dl_task(rq, p);
>> +		}
>> +
>> +		if ((p->dl.nr_cpus_allowed<= 1)&&  (weight>  1)) {
>> +			rq->dl.dl_nr_migratory++;
>> +		} else if ((p->dl.nr_cpus_allowed>  1)&&  (weight<= 1)) {
>> +			BUG_ON(!rq->dl.dl_nr_migratory);
>> +			rq->dl.dl_nr_migratory--;
>> +		}
>> +
>> +		update_dl_migration(&rq->dl);
>
> Note, I'm in the process of testing this patch:
>
>   https://lkml.org/lkml/2012/4/11/7
>
> Just giving you a heads up, as this looks like you can benefit from this
> change as well.
>

Sure! I noticed it just today and started wondering how it would apply in
my case.
  
>
>> +	}
>> +
>>   	cpumask_copy(&p->cpus_allowed, new_mask);
>>   	p->dl.nr_cpus_allowed = weight;
>>   }
>> +
>
>

Thanks,

- Juri
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