linux-kernel - Re: [PATCH 03/14] sched: SCHED_DEADLINE structures & implementation.

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Message-ID: <20131014112410.GC3081@twins.programming.kicks-ass.net>
Date:	Mon, 14 Oct 2013 13:24:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Juri Lelli <juri.lelli@...il.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, rostedt@...dmis.org,
	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@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com--no-chain-reply-to
Subject: Re: [PATCH 03/14] sched: SCHED_DEADLINE structures & implementation.

On Mon, Oct 14, 2013 at 12:43:35PM +0200, Juri Lelli wrote:
> +/*
> + * We are being explicitly informed that a new instance is starting,
> + * and this means that:
> + *  - the absolute deadline of the entity has to be placed at
> + *    current time + relative deadline;
> + *  - the runtime of the entity has to be set to the maximum value.
> + *
> + * The capability of specifying such event is useful whenever a -deadline
> + * entity wants to (try to!) synchronize its behaviour with the scheduler's
> + * one, and to (try to!) reconcile itself with its own scheduling
> + * parameters.
> + */
> +static inline void setup_new_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);
> +
> +	WARN_ON(!dl_se->dl_new || dl_se->dl_throttled);
> +
> +	/*
> +	 * We use the regular wall clock time to set deadlines in the
> +	 * future; in fact, we must consider execution overheads (time
> +	 * spent on hardirq context, etc.).
> +	 */
> +	dl_se->deadline = rq->clock + dl_se->dl_deadline;
> +	dl_se->runtime = dl_se->dl_runtime;
> +	dl_se->dl_new = 0;
> +}

78becc270975 sched: Use an accessor to read the rq clock

wants you to use rq_clock(rq) there I think.


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