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From: Hillf Danton <dhillf@gmail.com>
To: Yong Zhang <yong.zhang0@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
	Peter Zijlstra <peterz@infradead.org>,
	Mike Galbraith <efault@gmx.de>
Subject: Re: [PATCH] sched: fix how RT task is pulled
Date: Tue, 17 May 2011 22:47:09 +0800	[thread overview]
Message-ID: <BANLkTimOfL9iWFEhV6tQcTBM+V5N3b+-YA@mail.gmail.com> (raw)
In-Reply-To: <BANLkTikPhwajRBZ-dx46NnobOu10AmXoSg@mail.gmail.com>

On Tue, May 17, 2011 at 10:35 AM, Yong Zhang <yong.zhang0@gmail.com> wrote:
> On Sun, May 15, 2011 at 10:50 AM, Hillf Danton <dhillf@gmail.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

  reply	other threads:[~2011-05-17 14:47 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-15  2:50 [PATCH] sched: fix how RT task is pulled Hillf Danton
2011-05-17  2:35 ` Yong Zhang
2011-05-17 14:47   ` Hillf Danton [this message]
2011-05-17 18:27     ` Mike Galbraith
2011-05-18  1:24       ` Steven Rostedt

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