linux-kernel - Re: [RFC][PATCH 05/22] sched: SCHED

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Message-ID: <1289420478.2084.54.camel@laptop>
Date:	Wed, 10 Nov 2010 21:21:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Raistlin <raistlin@...ux.it>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <luca.abeni@...tn.it>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 05/22] sched: SCHED_DEADLINE policy implementation

On Fri, 2010-10-29 at 08:30 +0200, Raistlin wrote:
> +static void update_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);
> +
> +       /*
> +        * The arrival of a new instance needs special treatment, i.e.,
> +        * the actual scheduling parameters have to be "renewed".
> +        */
> +       if (dl_se->dl_new) {
> +               setup_new_dl_entity(dl_se);
> +               return;
> +       }
> +
> +       if (dl_time_before(dl_se->deadline, rq->clock) ||
> +           dl_entity_overflow(dl_se, rq->clock)) {
> +               dl_se->deadline = rq->clock + dl_se->dl_deadline;
> +               dl_se->runtime = dl_se->dl_runtime;
> +       }
> +} 

Can't we loose runtime deficit this way?
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