linux-kernel - Re: [PATCH] sched: fix how RT task is pulled

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Message-ID: <BANLkTimOfL9iWFEhV6tQcTBM+V5N3b+-YA@mail.gmail.com>
Date:	Tue, 17 May 2011 22:47:09 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] sched: fix how RT task is pulled

On Tue, May 17, 2011 at 10:35 AM, Yong Zhang <yong.zhang0@...il.com> wrote:
> On Sun, May 15, 2011 at 10:50 AM, Hillf Danton <dhillf@...il.com> wrote:
>> When pulling RT task for a given runqueue, if it is already overloaded
>> with RT tasks, the pull operation could be avoided at the moment.
>>
>> btw, it looks like a typo?
>
> No.
>
> Below is how rt_overloaded() is realized:
> static inline int rt_overloaded(struct rq *rq)
> {
>        return atomic_read(&rq->rd->rto_count);
> }
>
> You can notice it's about the overload of the very root_domain.
>
Well, why is it going no head if not overloaded?

thanks
          Hillf
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