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

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Message-ID: <xhsmhr0z3wx5z.mognet@vschneid.remote.csb>
Date:   Wed, 19 Oct 2022 18:17:12 +0100
From:   Valentin Schneider <vschneid@...hat.com>
To:     Connor O'Brien <connoro@...gle.com>, linux-kernel@...r.kernel.org
Cc:     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>,
        Connor O'Brien <connoro@...gle.com>
Subject: Re: [RFC PATCH 05/11] sched: Split scheduler execution context

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/