linux-kernel - Re: [RFC PATCH] sched: select_idle

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Message-ID: <52D8A054.5030203@linux.vnet.ibm.com>
Date:	Fri, 17 Jan 2014 11:15:32 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	Alex Shi <alex.shi@...aro.org>, Mike Galbraith <efault@....de>
CC:	mingo@...hat.com, peterz@...radead.org, morten.rasmussen@....com,
	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] sched: select_idle_sibling macro optimize

On 01/17/2014 10:14 AM, Alex Shi wrote:
[snip]
>>
>> When is that gonna happen?
> 
> I had seen this in a Intel platform, you may have both CPU domain and MC
> domain layer, because the domain flag is different, then they can not be
> merged. and then the CPU domain just has one group.

CPU and MC are different domains, isn't it?

General should like:

CPU	cpu0				cpu1
MC	core0		core1		core0		core1
SMT	cpu 0	cpu 1	cpu 2	cpu 3	cpu 4	cpu 5	cpu 6	cpu 7

So for cpu0:

CPU	sg0:cpu0,1,2,3	sg1:cpu4,5,6,7
MC	sg0:cpu0,1	sg1:cpu2,3
SMT	sg0:cpu0	sg1:cpu1

If one domain only have one group, that's sounds really a weird topology...

Regards,
Michael Wang

>>
>> -Mike
>>
>>
> 
> 

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