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

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Message-ID: <4F85AD2A.6000402@gmail.com>
Date:	Wed, 11 Apr 2012 18:11:22 +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
Subject: Re: [PATCH 06/16] sched: SCHED_DEADLINE push and pull logic

On 04/11/2012 06:07 PM, Steven Rostedt wrote:
> On Fri, 2012-04-06 at 09:14 +0200, Juri Lelli wrote:
>
>> +static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p)
>> +{
>> +	/*
>> +	 * Current can't be migrated, useles to reschedule,
>
>   s/useles/useless/
>
> I feel so useles by only adding typo fixes ;-)
>

Don't know why.. but this instead sounds good to me :-P.

>> +	 * let's hope p can move out.
>> +	 */
>> +	if (rq->curr->dl.nr_cpus_allowed == 1 ||
>> +	    latest_cpu_find(rq->rd->span, rq->curr, NULL) == -1)
>> +		return;
>> +
>> +	/*
>> +	 * p is migratable, so let's not schedule it and
>> +	 * see if it is pushed or pulled somewhere else.
>> +	 */
>> +	if (p->dl.nr_cpus_allowed != 1&&
>> +	    latest_cpu_find(rq->rd->span, p, NULL) != -1)
>> +		return;
>> +
>> +	resched_task(rq->curr);
>> +}
>> +
>> +#endif /* CONFIG_SMP */
>> +
>

Thanks,

- Juri
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