linux-kernel - Re: [PATCH v6 5/6] sched: replace capacity

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Date:	Mon, 6 Oct 2014 10:55:07 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Rik van Riel <riel@...hat.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Mike Galbraith <efault@....de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Paul Turner <pjt@...gle.com>,
	Benjamin Segall <bsegall@...gle.com>
Subject: Re: [PATCH v6 5/6] sched: replace capacity_factor by usage

On 3 October 2014 17:38, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, Sep 23, 2014 at 06:08:04PM +0200, Vincent Guittot wrote:
>
>> This implementation of utilization_avg_contrib doesn't solve the scaling
>> in-variance problem, so i have to scale the utilization with original
>> capacity of the CPU in order to get the CPU usage and compare it with the
>> capacity. Once the scaling invariance will have been added in
>> utilization_avg_contrib, we will remove the scale of utilization_avg_contrib
>> by cpu_capacity_orig in get_cpu_usage. But the scaling invariance will come
>> in another patchset.
>
> I would have expected this in the previous patch that introduced that
> lot. Including a few words on how/why the cpu_capacity is a 'good'
> approximation etc..

That's fair, i can move the explanation

>
>> Finally, the sched_group->sched_group_capacity->capacity_orig has been removed
>> because it's more used during load balance.
>
> That sentence is a contradiction, I expect there's a negative gone
> missing someplace.

yes the "no" is of "because it is no more used during load balance" is missing
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