linux-kernel - Re: [PATCH] sched: fix conflict of schedule domain balance in RT scheduling

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Message-ID: <BANLkTinoiKq-rJ989cakwLmbO6zqSmLMgg@mail.gmail.com>
Date:	Fri, 3 Jun 2011 22:38:36 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sched: fix conflict of schedule domain balance in RT scheduling

On Thu, Jun 2, 2011 at 7:56 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2011-06-01 at 21:58 +0800, Hillf Danton wrote:
>> SD_BALANCE_WAKE and SD_WAKE_AFFINE are defined to be mutually
>> exclusive
>
> Uhm, no they're not.. both affect placement of a woken task but they're
> complementary. WAKE_AFFINE is a check to see if it makes sense to run
> the woken task on the same cpu as the wakee, BALANCE_WAKE does a full
> load-balance pass,

Though I dont understand the following, my question is why WAKE_AFFINE is
eligible for pushing RT tasks off the RQ on which they are waiting.

thanks
           Hillf

>in case its combined with WAKE_AFFINE it does so in
> case that test is negative.
>
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