linux-kernel - Re: [PATCH] sched/deadline: document behavior of sched

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Date:   Fri, 9 Sep 2016 14:24:10 +0200
From:   luca abeni <luca.abeni@...tn.it>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
        Juri Lelli <juri.lelli@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-dl@...is.sssup.it
Subject: Re: [PATCH] sched/deadline: document behavior of sched_yield()

On Fri, 9 Sep 2016 09:17:56 -0300
Daniel Bristot de Oliveira <bristot@...hat.com> wrote:

> On 09/09/2016 07:00 AM, luca abeni wrote:
> > Maybe instead of saying that the task is suspended you can say that
> > since the remaining runtime goes to 0 the task is immediately throttled,
> > and will be able to execute again only after the time is equal to the
> > scheduling deadline (as explained in "2. Scheduling algorithm").  
> 
> well, that is not true anymore. Since:
> 
> 48be3a6 sched/deadline: Always calculate end of period on sched_yield()
> 
> the runtime is zeroed at the replenishment, if dl_se->dl_yielded is set
> and runtime > 0.

Ok, but the task is still throttled, right?



			Thanks,
				Luca