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

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Message-ID: <CAFTL4hw1Zq+nUG5CXe+7sGNa_1A3YGpe-TBbSTeaPtzXWD57hg@mail.gmail.com>
Date:	Thu, 6 Dec 2012 18:50:05 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Alex Shi <alex.shi@...el.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

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.
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