linux-kernel - Re: [RFC] sched: CPU topology try

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Date:	Mon, 6 Jan 2014 17:31:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Dietmar Eggemann <dietmar.eggemann@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"pjt@...gle.com" <pjt@...gle.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	"alex.shi@...aro.org" <alex.shi@...aro.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"rjw@...k.pl" <rjw@...k.pl>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"corbet@....net" <corbet@....net>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"amit.kucheria@...aro.org" <amit.kucheria@...aro.org>,
	"james.hogan@...tec.com" <james.hogan@...tec.com>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>
Subject: Re: [RFC] sched: CPU topology try

On Mon, Jan 06, 2014 at 02:41:31PM +0100, Vincent Guittot wrote:
> IMHO, these settings will disappear sooner or later, as an example the
> idle/busy _idx are going to be removed by Alex's patch.

Well I'm still entirely unconvinced by them..

removing the cpu_load array makes sense, but I'm starting to doubt the
removal of the _idx things.. I think we want to retain them in some
form, it simply makes sense to look at longer term averages when looking
at larger CPU groups.

So maybe we can express the things in log_2(group-span) or so, but we
need a working replacement for the cpu_load array. Ideally some
expression involving the blocked load.

Its another one of those things I need to ponder more :-)
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