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Date: Tue, 10 Apr 2012 23:06:28 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Juri Lelli <juri.lelli@...il.com> 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 Fri, 2012-04-06 at 09:14 +0200, Juri Lelli wrote: > +/* > + * Pure Earliest Deadline First (EDF) scheduling does not deal with the > + * possibility of a entity lasting more than what it declared, and thus > + * exhausting its runtime. > + * > + * Here we are interested in making runtime overrun possible, but we do > + * not want a entity which is misbehaving to affect the scheduling of all > + * other entities. > + * Therefore, a budgeting strategy called Constant Bandwidth Server (CBS) > + * is used, in order to confine each entity within its own bandwidth. > + * > + * This function deals exactly with that, and ensures that when the runtime > + * of a entity is replenished, its deadline is also postponed. That ensures > + * the overrunning entity can't interfere with other entity in the system and > + * can't make them miss their deadlines. Reasons why this kind of overruns > + * could happen are, typically, a entity voluntarily trying to overcume its s/overcume/overcome/ -- Steve > + * runtime, or it just underestimated it during sched_setscheduler_ex(). > + */ > +static void replenish_dl_entity(struct sched_dl_entity *dl_se) > +{ > + -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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