linux-kernel - Re: [patch] sched: optimize activate_task for RT task

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Message-Id: <1163579046.7035.29.camel@Homer.simpson.net>
Date:	Wed, 15 Nov 2006 09:24:06 +0100
From:	Mike Galbraith <efault@....de>
To:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
Cc:	nickpiggin@...oo.com.au, 'Ingo Molnar' <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] sched: optimize activate_task for RT task - v2

On Wed, 2006-11-15 at 08:00 +0100, Mike Galbraith wrote:

> Personally, I think it's best to leave it as it is.  With that change,
> if someone changes policy while the task is waiting to get cpu, it will
> be requeued, and the on-runqueue bonus logic will then end up using
> wildly inaccurate information.

Bah, that's inverted.  interactive_sleep() will never be true after a
rt->non-rt policy change while enqueued with your change, so on-runqueue
bonus will be disabled where it otherwise might have been enabled.  Not
terribly interesting in any case given the likelihood, but still...

	-Mike

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