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

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Message-ID: <525C0163.2060002@gmail.com>
Date:	Mon, 14 Oct 2013 16:36:19 +0200
From:	Juri Lelli <juri.lelli@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
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,
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	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
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	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 10/14/2013 01:24 PM, Peter Zijlstra wrote:
> 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.
> 
> 

Modified here and below.

Thanks,

- Juri
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