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

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Date:	Tue, 11 Mar 2014 13:48:28 +0000
From:	Dietmar Eggemann <dietmar.eggemann@....com>
To:	Vincent Guittot <vincent.guittot@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>
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 11/03/14 13:27, Vincent Guittot wrote:
> 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

If backward compatibility is not an issue here, keep it.

-- Dietmar

> 
> 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.
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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