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

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Message-ID: <BANLkTik8PpdwGgLOE7rAauXqGYdnT53GpQ@mail.gmail.com>
Date:	Fri, 17 Jun 2011 20:59:59 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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, Jun 17, 2011 at 9:50 AM, Steven Rostedt <rostedt@...dmis.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
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