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Date: Fri, 17 Jun 2011 20:59:59 +0800
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Subject: Re: [PATCH] sched: update cpupri for runqueue when its priority changes
From: Hillf Danton <dhillf@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Mike Galbraith <efault@gmx.de>,
        Yong Zhang <yong.zhang0@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>
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On Fri, Jun 17, 2011 at 9:50 AM, Steven Rostedt <rostedt@goodmis.org> wrote:
> On Sun, 2011-06-05 at 17:54 +0800, Hillf Danton wrote:
>> When the priority of runqueue changes, lower or higer, the info of cpupri
>> should be updated, in cases such as pick_next_task_rt() and switched_to_rt().
>
> Why?
>
> 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.

Hillf