linux-kernel - Re: [PATCH 0/7] CPU controller

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Date:	Mon, 21 Aug 2006 17:10:41 +0000
From:	Mike Galbraith <efault@....de>
To:	vatsa@...ibm.com
Cc:	Ingo Molnar <mingo@...e.hu>, Nick Piggin <nickpiggin@...oo.com.au>,
	Sam Vilain <sam@...ain.net>, linux-kernel@...r.kernel.org,
	Kirill Korotaev <dev@...nvz.org>,
	Balbir Singh <balbir@...ibm.com>, sekharan@...ibm.com,
	Andrew Morton <akpm@...l.org>, nagar@...son.ibm.com,
	matthltc@...ibm.com, dipankar@...ibm.com
Subject: Re: [PATCH 0/7] CPU controller - V1

On Mon, 2006-08-21 at 18:18 +0530, Srivatsa Vaddagiri wrote:
> On Mon, Aug 21, 2006 at 10:42:40AM +0000, Mike Galbraith wrote:
> > WRT interactivity: Looking at try_to_wake_up(), it appears that wake-up
> > of a high priority group-a task will not result in preemption of a lower
> > priority current group-b task.  True?
> 
> I dont think it is true. The definition of TASK_PREEMPTS_CURR() is
> unchanged with these patches.

I must be missing something.  If current and awakening tasks have
separate runqueues, task_rq(awakening)->curr != current.  We won't look
at current->prio, so won't resched(current).

	-Mike

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