linux-kernel - Re: [PATCH 07/15] sched/smp: Use lag to simplify cross-runqueue placement

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Message-ID: <20230912153221.lSL8YgJJ@linutronix.de>
Date:   Tue, 12 Sep 2023 17:32:21 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, vincent.guittot@...aro.org,
        linux-kernel@...r.kernel.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, corbet@....net,
        qyousef@...alina.io, chris.hyser@...cle.com,
        patrick.bellasi@...bug.net, pjt@...gle.com, pavel@....cz,
        qperret@...gle.com, tim.c.chen@...ux.intel.com, joshdon@...gle.com,
        timj@....org, kprateek.nayak@....com, yu.c.chen@...el.com,
        youssefesmat@...omium.org, joel@...lfernandes.org, efault@....de,
        tglx@...utronix.de
Subject: Re: [PATCH 07/15] sched/smp: Use lag to simplify cross-runqueue
 placement

On 2023-05-31 13:58:46 [+0200], Peter Zijlstra wrote:
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -12492,22 +12440,9 @@ static void task_fork_fair(struct task_s
>  
>  	cfs_rq = task_cfs_rq(current);
>  	curr = cfs_rq->curr;
> -	if (curr) {
> +	if (curr)
>  		update_curr(cfs_rq);
> -		se->vruntime = curr->vruntime;
> -	}
>  	place_entity(cfs_rq, se, 1);
> -
> -	if (sysctl_sched_child_runs_first && curr && entity_before(curr, se)) {

Since the removal of sysctl_sched_child_runs_first there is no user of
this anymore. There is still the sysctl file sched_child_runs_first with
no functionality.
Is this intended or should it be removed?

…
>  	rq_unlock(rq, &rf);
>  }

Sebastian