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

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Message-ID: <20140106162813.GM31570@twins.programming.kicks-ass.net>
Date:	Mon, 6 Jan 2014 17:28:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	Vincent Guittot <vincent.guittot@...aro.org>,
	"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, Dec 23, 2013 at 06:22:17PM +0100, Dietmar Eggemann wrote:
> I'm not sure if the idea to create a dedicated sched_domain level for every
> topology flag representing a specific functionality will scale. From the
> perspective of energy-aware scheduling we need e.g. energy costs (P and C
> state) which can only be populated towards the scheduler via an additional
> sub-struct and additional function arch_sd_energy() like depicted in
> Morten's email:
> 
> [2] lkml.org/lkml/2013/11/14/102

That lkml.org link is actually not working for me (blank page -- maybe
lkml.org is on the blink again).

That said, I yet have to sit down and think about the P state stuff, but
I was thinking we need some rudimentary domain support for that.

For instance, the big-little thingies seem share their P state per
cluster, so we need a domain at that level to hang some state off of --
which we actually have in this case. But we need to ensure we do have
it -- somehow.

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