linux-kernel - Re: [PATCH 2/2] sched/deadline: Throttle a constrained deadline task activated after the deadline

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Message-ID: <20170213103303.0e3b3953@gandalf.local.home>
Date:   Mon, 13 Feb 2017 10:33:03 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@....com>,
        Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
        Luca Abeni <luca.abeni@...tannapisa.it>
Subject: Re: [PATCH 2/2] sched/deadline: Throttle a constrained deadline
 task activated after the deadline

On Fri, 10 Feb 2017 20:48:11 +0100
Daniel Bristot de Oliveira <bristot@...hat.com> wrote:

>  
> +static inline bool dl_is_constrained(struct sched_dl_entity *dl_se)
> +{
> +	return dl_se->dl_runtime < dl_se->dl_period;
> +}
> +

Is it ever appropriate for a dl task to have runtime == period? What
purpose would that serve? Just run the task as FIFO higher than
everything else.

Or was this suppose to be dl_deadline < dl_period?

-- Steve