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From: Peter Zijlstra <peterz@infradead.org>
To: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: mingo@redhat.com, valentin.schneider@arm.com,
	dietmar.eggemann@arm.com, vincent.guittot@linaro.org,
	gaku.inami.xh@renesas.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv2 3/7] sched/fair: Consider misfit tasks when load-balancing
Date: Wed, 11 Apr 2018 12:53:29 +0200	[thread overview]
Message-ID: <20180411105329.GI4043@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1521125224-15434-4-git-send-email-morten.rasmussen@arm.com>

On Thu, Mar 15, 2018 at 02:47:00PM +0000, Morten Rasmussen wrote:
> +	/*
> +	 * Don't try to pull misfit tasks we can't help.
> +	 */
> +	if (sgs->group_type == group_misfit_task &&
> +	    (!group_smaller_cpu_capacity(sg, sds->local) ||
> +	     !group_has_capacity(env, &sds->local_stat)))
> +		return false;
> +

I think that has the same 'problem' as last time, right? Since
group_smaller_cpu_capacity() is affected by RT/IRQ pressure.

We should have a comment stating this and preferably explaining why that
is ok.

  parent reply	other threads:[~2018-04-11 10:53 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-15 14:46 [PATCHv2 0/7] sched/fair: Migrate 'misfit' tasks on asymmetric capacity systems Morten Rasmussen
2018-03-15 14:46 ` [PATCHv2 1/7] sched: Add static_key for asymmetric cpu capacity optimizations Morten Rasmussen
2018-04-27 14:04   ` [PATCHv2,1/7] " Jiada Wang
2018-04-29 19:09     ` Valentin Schneider
2018-03-15 14:46 ` [PATCHv2 2/7] sched/fair: Add group_misfit_task load-balance type Morten Rasmussen
2018-04-11 10:45   ` Peter Zijlstra
2018-03-15 14:47 ` [PATCHv2 3/7] sched/fair: Consider misfit tasks when load-balancing Morten Rasmussen
2018-04-11 10:46   ` Peter Zijlstra
2018-04-11 10:53   ` Peter Zijlstra [this message]
2018-03-15 14:47 ` [PATCHv2 4/7] sched/fair: Kick nohz balance if rq->misfit_task Morten Rasmussen
2018-03-15 14:47 ` [PATCHv2 5/7] sched: Change root_domain->overload type to int Morten Rasmussen
2018-03-15 14:47 ` [PATCHv2 6/7] sched: Wrap rq->rd->overload accesses with READ/WRITE_ONCE Morten Rasmussen
2018-03-15 14:47 ` [PATCHv2 7/7] sched/fair: Set sd->overload when misfit Morten Rasmussen
2018-03-20  5:30 ` [PATCHv2 0/7] sched/fair: Migrate 'misfit' tasks on asymmetric capacity systems Gaku Inami
2018-03-20  9:17   ` Morten Rasmussen

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