linux-kernel - Re: [PATCH 10/23] sched,mmc: Convert to sched_set

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Message-ID: <20200423085938.GV20713@hirez.programming.kicks-ass.net>
Date:   Thu, 23 Apr 2020 10:59:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>, qais.yousef@....com,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        bsegall@...gle.com, mgorman@...e.de
Subject: Re: [PATCH 10/23] sched,mmc: Convert to sched_set_fifo*()

On Wed, Apr 22, 2020 at 06:59:35PM +0200, Ulf Hansson wrote:
> On Wed, 22 Apr 2020 at 13:29, Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > Because SCHED_FIFO is a broken scheduler model (see previous patches)
> > take away the priority field, the kernel can't possibly make an
> > informed decision.
> >
> > In this case, use fifo_low, because it only cares about being above
> > SCHED_NORMAL. Effectively no change in behaviour.
> >
> > Cc: ulf.hansson@...aro.org
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Reviewed-by: Ingo Molnar <mingo@...nel.org>
> 
> Acked-by: Ulf Hansson <ulf.hansson@...aro.org>

Thanks!

> FYI: I am slowly moving towards removing the entire kthread for the
> sdio_irq_thread(). It shouldn't be too far off to be posted, one or
> two kernel releases or so.

Moving over to regular threaded interrupts? Anyway, cool, if these
series collide it's easy enough to drop this patch on the floor if it
turns out obsolete.