From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1756913AbaIQXDe (ORCPT <rfc822;w@1wt.eu>);
	Wed, 17 Sep 2014 19:03:34 -0400
Received: from casper.infradead.org ([85.118.1.10]:60817 "EHLO
	casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1756526AbaIQXDd (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 17 Sep 2014 19:03:33 -0400
Date: Thu, 18 Sep 2014 01:03:25 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Ingo Molnar <mingo@kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Preeti U Murthy <preeti@linux.vnet.ibm.com>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        LAK <linux-arm-kernel@lists.infradead.org>,
        Rik van Riel <riel@redhat.com>, Mike Galbraith <efault@gmx.de>,
        "linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Dietmar Eggemann <Dietmar.Eggemann@arm.com>
Subject: Re: [PATCH v5 11/12] sched: replace capacity_factor by utilization
Message-ID: <20140917230325.GI2848@worktop.localdomain>
References: <1409051215-16788-1-git-send-email-vincent.guittot@linaro.org>
 <1409051215-16788-12-git-send-email-vincent.guittot@linaro.org>
 <20140911161517.GA3190@worktop.ger.corp.intel.com>
 <CAKfTPtDFuzxzGBKi_n6v_F8FUkQ84MW+dQBX4WNXo-o54mksGA@mail.gmail.com>
 <20140914194156.GC2832@worktop.localdomain>
 <20140915114229.GB3037@worktop.localdomain>
 <alpine.LFD.2.11.1409151451540.8647@knanqh.ubzr>
 <20140915200159.GE2840@worktop.localdomain>
 <20140917184527.GB9854@e103034-lin>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20140917184527.GB9854@e103034-lin>
User-Agent: Mutt/1.5.22.1 (2013-10-16)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, Sep 17, 2014 at 07:45:27PM +0100, Morten Rasmussen wrote:
> Right. You don't need to scale capacity to determine whether a cpu is
> full or not if you don't have DVFS, but I don't think it hurts if it is
> done right. We need the scaling to figure out how much capacity is
> available.

Maybe I'm particularly dense, but I'm not seeing how the proposed thing
is 'right' in any way.

There are no words on what specifically is addressed and how it is
achieved.

From mboxrd@z Thu Jan  1 00:00:00 1970
From: peterz@infradead.org (Peter Zijlstra)
Date: Thu, 18 Sep 2014 01:03:25 +0200
Subject: [PATCH v5 11/12] sched: replace capacity_factor by utilization
In-Reply-To: <20140917184527.GB9854@e103034-lin>
References: <1409051215-16788-1-git-send-email-vincent.guittot@linaro.org>
 <1409051215-16788-12-git-send-email-vincent.guittot@linaro.org>
 <20140911161517.GA3190@worktop.ger.corp.intel.com>
 <CAKfTPtDFuzxzGBKi_n6v_F8FUkQ84MW+dQBX4WNXo-o54mksGA@mail.gmail.com>
 <20140914194156.GC2832@worktop.localdomain>
 <20140915114229.GB3037@worktop.localdomain>
 <alpine.LFD.2.11.1409151451540.8647@knanqh.ubzr>
 <20140915200159.GE2840@worktop.localdomain>
 <20140917184527.GB9854@e103034-lin>
Message-ID: <20140917230325.GI2848@worktop.localdomain>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Sep 17, 2014 at 07:45:27PM +0100, Morten Rasmussen wrote:
> Right. You don't need to scale capacity to determine whether a cpu is
> full or not if you don't have DVFS, but I don't think it hurts if it is
> done right. We need the scaling to figure out how much capacity is
> available.

Maybe I'm particularly dense, but I'm not seeing how the proposed thing
is 'right' in any way.

There are no words on what specifically is addressed and how it is
achieved.