linux-kernel - Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq

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Message-ID: <51273609.9080308@linux.vnet.ibm.com>
Date:	Fri, 22 Feb 2013 17:10:33 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>, alex.shi@...el.com,
	Ram Pai <linuxram@...ibm.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq_fair()

On 02/22/2013 04:21 PM, Peter Zijlstra wrote:
> On Fri, 2013-02-22 at 10:36 +0800, Michael Wang wrote:
>> According to my understanding, in the old world, wake_affine() will
>> only
>> be used if curr_cpu and prev_cpu share cache, which means they are in
>> one package, whatever search in llc sd of curr_cpu or prev_cpu, we
>> won't
>> have the chance to spread the task out of that package.
> 
> Nah, look at where SD_WAKE_AFFINE is set. Only 'remote/big' NUMA domains
> don't have it set, but 'small' NUMA systems will have it set over the
> entire domain tree.

Oh, I missed that point...

But I don't get the reason to make NUMA level affine, cpus in different
nodes share cache? doesn't make sense...

Regards,
Michael Wang

> 
> 
> 
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