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

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Message-Id: <1156192388.6665.29.camel@Homer.simpson.net>
Date:	Mon, 21 Aug 2006 20:33:08 +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 22:15 +0530, Srivatsa Vaddagiri wrote:

> Hence task_rq(awakening)->curr == current, which should be sufficient to 

Ah, ok.  Thanks.  I should have read more of the code instead of
pondering the text.

> resched(current), although I think there is a bug in current code 
> (irrespective of these patches):
> 
> try_to_wake_up() :
> 	
> 	...
> 
>         if (!sync || cpu != this_cpu) {
>                 if (TASK_PREEMPTS_CURR(p, rq))
>                         resched_task(rq->curr);
>         }
>         success = 1;
> 
> 	...
> 
> TASK_PREEMPTS_CURR() is examined and resched_task() is called only if 
> (cpu != this_cpu). What about the case (cpu == this_cpu) - who will
> call resched_task() on current? I had expected the back-end of interrupt
> handling to do that, but didnt find any code to do so.

Looks ok to me.  Everything except sync && cpu == this_cpu checks.

	-Mike

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