linux-kernel - Re: [PATCHv2 3/7] sched/fair: Consider misfit tasks when load-balancing

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Message-ID: <20180411104639.GH4043@hirez.programming.kicks-ass.net>
Date:   Wed, 11 Apr 2018 12:46:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Morten Rasmussen <morten.rasmussen@....com>
Cc:     mingo@...hat.com, valentin.schneider@....com,
        dietmar.eggemann@....com, vincent.guittot@...aro.org,
        gaku.inami.xh@...esas.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 3/7] sched/fair: Consider misfit tasks when
 load-balancing

On Thu, Mar 15, 2018 at 02:47:00PM +0000, Morten Rasmussen wrote:
> @@ -8548,6 +8569,14 @@ static struct rq *find_busiest_queue(struct lb_env *env,
>  		if (rt > env->fbq_type)
>  			continue;
>  
> +		/*
> +		 * For ASYM_CPUCAPACITY domains with misfit tasks we ignore
> +		 * load.
> +		 */
> +		if (env->src_grp_type == group_misfit_task &&
> +		    rq->misfit_task_load)
> +			return rq;
> +
>  		capacity = capacity_of(i);
>  
>  		wl = weighted_cpuload(rq);

Similarly, should we not return worst misfit instead of the first?