linux-kernel - Re: [PATCH 2/6] sched: rework of sched_domain topology definition

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Message-ID: <CAKfTPtDHfXxheXBoPeAxMGROroHa7YrW7y_RCB9nSoKCeTa66w@mail.gmail.com>
Date:	Tue, 11 Mar 2014 14:27:12 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	"fenghua.yu@...el.com" <fenghua.yu@...el.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"james.hogan@...tec.com" <james.hogan@...tec.com>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/6] sched: rework of sched_domain topology definition

On 11 March 2014 11:31, Peter Zijlstra <peterz@...radead.org> wrote:
> On Thu, Mar 06, 2014 at 04:32:35PM +0800, Vincent Guittot wrote:
>> > Never got the new name DIE for CPU? Might confuse people when they use
>> > /proc/sys/kernel/sched_domain/cpuX/domainY/name or sched_domain_debug_one().
>>
>> In fact, CPU is also confusing because it's used for different things.
>> But if it makes things even more confusing, i can come back to CPU
>
> Yeah, not sure DIE is the right thing either; because there's multi-die
> packages that get classified under CPU :-)
>
> Take for example the Core 2 Quad, which was 2 dual core dies glued
> together in a single package.
>
> There's also the AMD bulldozer which glued two dies into a single
> package; but for those its not a problem because each die is a separate
> numa node, so there DIE would actually be the correct term and PACKAGE
> would be wrong.
>
> So while CPU sucks, I'm not sure we can come up with anything that's
> actually correct. That said; we could try for something less wrong than
> CPU :-)

OK

Dietmar,

Have you got another naming that DIE that could suit better ?
otherwise i will keep it

Vincent

>
> I'm not sure there are a lot of people who see/know the names of these
> domains to be bothered by a change in them; it might be limited to just
> us for all I know.
>
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