linux-kernel - Re: [PATCH v4 1/5] sched/fair: Clean up attach_entity_load

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Date:	Mon, 6 Jun 2016 16:27:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>,
	Yuyang Du <yuyang.du@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Benjamin Segall <bsegall@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>
Subject: Re: [PATCH v4 1/5] sched/fair: Clean up attach_entity_load_avg()

On Mon, Jun 06, 2016 at 03:40:18PM +0200, Vincent Guittot wrote:
> > What about when tasks are moved between groups on CONFIG_SMP=n ?
> > Doesn't this change fail to age the load in that case?
> 
> The load average stuff is only enable for SMP system but it's not used
> for UP system.
> To be honest, I don't know why

We'll likely change that 'soon', because the cpufreq_schedutil thing
also needs these numbers on UP.