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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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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