linux-kernel - Re: [RFC PATCH 05/11] sched: Split scheduler execution context

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Message-ID: <CALE1s+NqyXziXaFbWdwG8SvP0WFrUaDSB+b9_u3uFL61B89=8g@mail.gmail.com>
Date:   Thu, 20 Oct 2022 11:43:54 -0700
From:   "Connor O'Brien" <connoro@...gle.com>
To:     Valentin Schneider <vschneid@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        John Stultz <jstultz@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Qais Yousef <qais.yousef@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        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>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [RFC PATCH 05/11] sched: Split scheduler execution context

On Wed, Oct 19, 2022 at 10:17 AM Valentin Schneider <vschneid@...hat.com> wrote:
>
> On 03/10/22 21:44, Connor O'Brien wrote:
> > @@ -1303,7 +1303,7 @@ static u64 grub_reclaim(u64 delta, struct rq *rq, struct sched_dl_entity *dl_se)
> >   */
> >  static void update_curr_dl(struct rq *rq)
> >  {
> > -     struct task_struct *curr = rq->curr;
> > +     struct task_struct *curr = rq->proxy;
>
> I found a note pointing out that Juri has a patch to unify the
> update_curr*() functions as part of the deadline servers thing; I think it
> could be picked as a standalone to at least unify the curr = rq->proxy
> trickery - this will also (hopefully) remove redundancy for whatever we do
> to expose sane runtime values to userspace.
>
> Last iteration I could find is:
>
> https://lore.kernel.org/all/20200807095051.385985-2-juri.lelli@redhat.com/

That makes sense, thanks for the pointer to this patch.