linux-kernel - Re: [PATCH 05/16] sched: SCHED_DEADLINE policy implementation.

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Date:	Wed, 11 Apr 2012 15:55:31 +0200
From:	Juri Lelli <juri.lelli@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	peterz@...radead.org, tglx@...utronix.de, mingo@...hat.com,
	cfriesen@...tel.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 05/16] sched: SCHED_DEADLINE policy implementation.

On 04/11/2012 03:41 PM, Steven Rostedt wrote:
> On Fri, 2012-04-06 at 09:14 +0200, Juri Lelli wrote:
>
>> +static void replenish_dl_entity(struct sched_dl_entity *dl_se)
>> +{
>> +	struct dl_rq *dl_rq = dl_rq_of_se(dl_se);
>> +	struct rq *rq = rq_of_dl_rq(dl_rq);
>> +
>> +	/*
>> +	 * We Keep moving the deadline away until we get some
>
> s/Keep/keep/
>
>> +	 * available runtime for the entity. This ensures correct
>> +	 * handling of situations where the runtime overrun is
>> +	 * arbitrary large.
>> +	 */
>> +	while (dl_se->runtime<= 0) {
>> +		dl_se->deadline += dl_se->dl_deadline;
>> +		dl_se->runtime += dl_se->dl_runtime;
>> +	}
>> +
>> +	/*
>> +	 * At this point, the deadline really should be "in
>> +	 * the future" with respect to rq->clock. If it's
>> +	 * not, we are, for some reason, lagging too much!
>> +	 * Anyway, after having warn userspace abut that,
>> +	 * we still try to keep the things running by
>> +	 * resetting the deadline and the budget of the
>> +	 * entity.
>> +	 */
>> +	if (dl_time_before(dl_se->deadline, rq->clock)) {
>> +		WARN_ON_ONCE(1);
>> +		dl_se->deadline = rq->clock + dl_se->dl_deadline;
>> +		dl_se->runtime = dl_se->dl_runtime;
>> +	}
>> +}
>> +
>
> I just finished reviewing patches 1-5, and have yet to find anything
> wrong with them (except for these typos). I'll continue my review, and
> then I'll start testing them.
>
> Good work (so far ;-)
>
> -- Steve
>
>

Well, I tried my best to not spoil to much the work made by
Dario & Co. :-).

Anyway, thanks!

- Juri
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