linux-kernel - Re: [RFC PATCH V3 5/6] sched/fair: Add trivial fair server

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Message-ID: <20230616125946.GN83892@hirez.programming.kicks-ass.net>
Date:   Fri, 16 Jun 2023 14:59:46 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        linux-kernel@...r.kernel.org,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joel Fernandes <joel@...lfernandes.org>,
        Vineeth Pillai <vineeth@...byteword.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [RFC PATCH V3 5/6] sched/fair: Add trivial fair server

On Thu, Jun 08, 2023 at 05:58:17PM +0200, Daniel Bristot de Oliveira wrote:
> +void fair_server_init(struct rq *rq)
> +{
> +	struct sched_dl_entity *dl_se = &rq->fair_server;
> +
> +	init_dl_entity(dl_se);
> +
> +	dl_se->dl_runtime = TICK_NSEC;
> +	dl_se->dl_deadline = 20 * TICK_NSEC;
> +	dl_se->dl_period = 20 * TICK_NSEC;
> +
> +	dl_server_init(dl_se, rq, fair_server_has_tasks, fair_server_pick);
> +}

These here numbers should obviously become a tunable somewhere... :-)