linux-kernel - Re: [PATCH] sched: update cpupri for runqueue when its priority changes

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Message-ID: <1308321265.9218.175.camel@gandalf.stny.rr.com>
Date:	Fri, 17 Jun 2011 10:34:25 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Hillf Danton <dhillf@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sched: update cpupri for runqueue when its priority
 changes

On Fri, 2011-06-17 at 20:59 +0800, Hillf Danton wrote:

> > We do the calculation on queuing and dequeuing the task, we only care
> > about the highest priority task that is on the queue, not what is
> > actually running.
> >
> 
> It is to capture the changes in CPU priority caused by re-queued task and
> throttled RQ.

If we throttled the rq, then the fix up should happen in the
(en,de)queue code, and not scattered around.

I'll look deeper into how throttling affects the cpupri.

-- Steve


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