linux-kernel - Re: [PATCH v5 6/7] sched/deadline: Deferrable dl server

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Message-ID: <20231108165717.GM3818@noisy.programming.kicks-ass.net>
Date:   Wed, 8 Nov 2023 17:57:17 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Ingo Molnar <mingo@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        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>,
        Vineeth Pillai <vineeth@...byteword.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [PATCH v5 6/7] sched/deadline: Deferrable dl server

On Wed, Nov 08, 2023 at 04:14:18PM +0100, Juri Lelli wrote:
> > +	if (dl_se->zerolax && dl_se->runtime > dl_runtime)
> > +		dl_se->runtime = dl_runtime;
> > +
> 
> Anyway, I have the impression that this breaks EDF/CBS, as we are letting
> the dl_server run with full dl_runtime w/o postponing the period
> (essentially an u = 1 reservation until runtime is depleted).

Yeah, I sorted it with Daniel, we were not trying to fix the same
problem :-)