linux-kernel - Re: [patch v4 01/18] sched: set SD_PREFER_SIBLING on MC domain to reduce a domain level

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Date:	Wed, 13 Feb 2013 22:17:50 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	torvalds@...ux-foundation.org, mingo@...hat.com,
	tglx@...utronix.de, akpm@...ux-foundation.org,
	arjan@...ux.intel.com, bp@...en8.de, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [patch v4 01/18] sched: set SD_PREFER_SIBLING on MC domain to
 reduce a domain level

On 02/12/2013 06:11 PM, Peter Zijlstra wrote:
> On Thu, 2013-01-24 at 11:06 +0800, Alex Shi wrote:
>> The domain flag SD_PREFER_SIBLING was set both on MC and CPU domain at
>> frist commit b5d978e0c7e79a, and was removed uncarefully when clear up
>> obsolete power scheduler. Then commit 6956dc568 recover the flag on CPU
>> domain only. It works, but it introduces a extra domain level since this
>> cause MC/CPU different.
>>
>> So, recover the the flag in MC domain too to remove a domain level in
>> x86 platform.

May I still miss the points of this patch:
Without this patch, the domain levels on my machines are:
SMT, MC, CPU, NUMA

with this patch, the domain levels are:
SMT, MC, NUMA

-- 
Thanks
    Alex
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