linux-kernel - Re: [PATCH] sched: correct how RT task is picked

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Message-ID: <1305731754.11267.3.camel@gandalf.stny.rr.com>
Date:	Wed, 18 May 2011 11:15:54 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Yong Zhang <yong.zhang0@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] sched: correct how RT task is picked

On Wed, 2011-05-18 at 22:46 +0800, Hillf Danton wrote:

> For migration, it is the case that cpu != rq->cpu, and
> if cpu is allowed by task's affinity, it is bug that task
> could not goto cpu because of nr_cpus_allowed since
> the nr_cpus_allowed is computed based on the cpus_allowed mask.

Right, that nr_cpus_allowed was to be a short cut, so we did not have to
look at the cpu mask. But as that check came after, it was pointless.
Perhaps that too was a relic with the cpu < 0 case.

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve


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