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

[Juri Lelli]

On 04/11/2012 05:06 AM, Steven Rostedt wrote:
> 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)
> > +{
> > +

Thanks!

- Juri
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