linux-kernel - Re: [PATCH 2/2] sched: fix a logical error in select_task_rq

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Date:	Thu, 26 Jul 2012 17:11:57 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	suresh.b.siddha@...el.com
Subject: Re: [PATCH 2/2] sched: fix a logical error in select_task_rq_fair

On 07/26/2012 04:17 PM, Peter Zijlstra wrote:

> On Thu, 2012-07-26 at 13:27 +0800, Alex Shi wrote:
>> If find_idlest_cpu() return '-1', and sd->child is NULL. The function
>> select_task_rq_fair will return -1. That is not the function's purpose.
> 
> But find_idlest_cpu() will only return -1 if the group mask is fully
> excluded by the cpus_allowed mask, right?


Yes.

> 
> In that case aren't we covering up a bug in find_idlest_group(), it
> appears to have returned a group that isn't eligible to be idlest.


If it is possible happening in sched_domain rebuilding?
I didn't meet this bug. Just guess.

> 
> 


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