linux-kernel - Re: [PATCH 09/10] sched, fair: Fix the sd_parent

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Message-ID: <521BCD7F.8010501@surriel.com>
Date:	Mon, 26 Aug 2013 17:49:51 -0400
From:	Rik van Riel <riel@...riel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Paul Turner <pjt@...gle.com>, Ingo Molnar <mingo@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Mike Galbraith <efault@....de>, Alex Shi <alex.shi@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Namhyung Kim <namhyung@...nel.org>,
	Lei Wen <leiwen@...vell.com>, Joonsoo Kim <js1304@...il.com>
Subject: Re: [PATCH 09/10] sched, fair: Fix the sd_parent_degenerate() code

On 08/26/2013 08:09 AM, Peter Zijlstra wrote:
> On Sat, Aug 24, 2013 at 03:45:57AM -0700, Paul Turner wrote:
>>> @@ -5157,6 +5158,13 @@ cpu_attach_domain(struct sched_domain *s
>>>                         tmp->parent = parent->parent;
>>>                         if (parent->parent)
>>>                                 parent->parent->child = tmp;
>>> +                       /*
>>> +                        * Transfer SD_PREFER_SIBLING down in case of a
>>> +                        * degenerate parent; the spans match for this
>>> +                        * so the property transfers.
>>> +                        */
>>> +                       if (parent->flags & SD_PREFER_SIBLING)
>>> +                               tmp->flags |= SD_PREFER_SIBLING;
>>>                         destroy_sched_domain(parent, cpu);
>>>                 } else
>>>                         tmp = tmp->parent;
>>>
>>
>> Reviewed-by: Paul Turner <pjt@...gle.com>
> 
> BTW, did that comment make sense to you or would you suggest something
> different? I had/am having a hard time with that comment. Somehow it
> leaves me wanting. I know I understand the issue now, but I'll doubt the
> comment will suffice in a years time :/

The comment made sense to me :)

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