linux-kernel - Re: [PATCH 0/3] sched: use EDF to throttle RT task groups v2

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Message-ID: <1267273991.22519.744.camel@laptop>
Date:	Sat, 27 Feb 2010 13:33:11 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fabio Checconi <fchecconi@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Dario Faggioli <faggioli@...dalf.sssup.it>,
	Michael Trimarchi <michael@...dence.eu.com>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Tommaso Cucinotta <t.cucinotta@...up.it>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] sched: use EDF to throttle RT task groups v2

On Tue, 2010-02-23 at 19:56 +0100, Fabio Checconi wrote:
>   - Since it is not easy to mix tasks and groups on the same scheduler
>     queue (tasks have no deadlines), the bandwidth reserved to the tasks
>     in a group is controlled with two additional cgroup attributes:
>     rt_task_runtime_us and rt_task_period_us.  These attributes control,
>     within a cgroup, how much bandwidth is reserved to the tasks it
>     contains.  The old attributes, rt_runtime_us and rt_period_us, are
>     still there, and control the bandwidth assigned to the cgroup.  They
>     are used only for admission control. 

We could do this implicitly by simply setting the task_bandwidth to the
cgroup bandwidth - \Sum_children bandwidth.

Having it explicit gives the administrator slightly more control at the
cost of a more complex interface.

Just wondering if you thought about this trade-off?

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