linux-kernel - Re: [PATCH 09/14] sched,fair: refactor enqueue/dequeue

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Message-ID: <7fabadbad16242139cd601a0f1e53fd54d309219.camel@surriel.com>
Date:   Tue, 30 Jul 2019 08:58:48 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, pjt@...gle.com,
        dietmar.eggemann@....com, mingo@...hat.com,
        morten.rasmussen@....com, tglx@...utronix.de,
        mgorman@...hsingularity.net, vincent.guittot@...aro.org
Subject: Re: [PATCH 09/14] sched,fair: refactor enqueue/dequeue_entity

On Tue, 2019-07-30 at 11:36 +0200, Peter Zijlstra wrote:
> On Mon, Jul 22, 2019 at 01:33:43PM -0400, Rik van Riel wrote:
> > @@ -3870,6 +3873,24 @@ static inline void
> > check_schedstat_required(void)
> >   * CPU and an up-to-date min_vruntime on the destination CPU.
> >   */
> >  
> > +static bool
> > +enqueue_entity_groups(struct cfs_rq *cfs_rq, struct sched_entity
> > *se, int flags)
> > +{
> > +	/*
> > +	 * When enqueuing a sched_entity, we must:
> > +	 *   - Update loads to have both entity and cfs_rq synced with
> > now.
> > +	 *   - Add its load to cfs_rq->runnable_avg
> > +	 *   - For group_entity, update its weight to reflect the new
> > share of
> > +	 *     its group cfs_rq
> > +	 *   - Add its new weight to cfs_rq->load.weight
> > +	 */
> > +	if (!update_load_avg(cfs_rq, se, UPDATE_TG | DO_ATTACH))
> > +		return false;
> > +
> > +	update_cfs_group(se);
> > +	return true;
> > +}
> >  
> 
> No functional, but you did make update_cfs_group() conditional. Now
> that
> looks OK, but maybe you can do that part in a separate patch with a
> little justification of its own.

Good idea, I will split that out.

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