linux-kernel - Re: [PATCH 01/10] sched: select_task_rq

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Message-ID: <50C138DB.70602@intel.com>
Date:	Fri, 07 Dec 2012 08:31:23 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	npiggin@...nel.dk, mingo@...hat.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 01/10] sched: select_task_rq_fair clean up

On 12/07/2012 01:50 AM, Frederic Weisbecker wrote:
> 2012/12/3 Alex Shi <alex.shi@...el.com>:
>> It is impossible to miss a task allowed cpu in a eligible group.
>>
>> And since find_idlest_group only return a different group which
>> excludes old cpu, it's also imporissible to find a new cpu same as old
>> cpu.
> 
> Is it possible for weighted_cpuload() to return ULONG_MAX? If so,
> find_idlest_cpu() can return -1.
> 

No, non of sched entity can has a ULONG_MAX weight.
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