From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Fabio Checconi <fchecconi@gmail.com>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org,
Gregory Haskins <ghaskins@novell.com>
Subject: Re: [RFC][PATCH 0/8] Use EDF to throttle RT task groups
Date: Wed, 15 Jul 2009 16:25:51 +0200 [thread overview]
Message-ID: <1247667951.5295.6.camel@laptop> (raw)
In-Reply-To: <20090715120802.GD2659@gandalf.sssup.it>
On Wed, 2009-07-15 at 14:08 +0200, Fabio Checconi wrote:
>
> > I might have to re-read that mim-concurrency G-EDF paper again, but I
> > failed to spot the bin-packing issue.
> >
> In the paper you cited, the Conclusion section lists the support for
> dynamic systems and for joining/leaving of tasks as a future work; I
> think that handling (de-)fragmentation and allocation of cpu bandwidth
> when tasks and groups are created/destroyed might be quite complex from
> within the kernel.
Hmm, right, so I was thinking that we could simply create int(w_i) full
cpu and 1 frac(w_i) server tasks and let the single level G-EDF sort it
out.
It looks to me that by only scheduling the leafs of the hierarchy you
side-step a lot of issues, but then maybe it generates other issues :-)
> I'd prefer to have the mechanims enforcing the bandwidth allocation
> inside the kernel, and, eventually, an interface allowing the userspace
> to specify nontrivial allocation schemes, like the one in the paper.
Right.
prev parent reply other threads:[~2009-07-15 14:41 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-15 18:55 [RFC][PATCH 0/8] Use EDF to throttle RT task groups Fabio Checconi
2009-06-15 18:56 ` [PATCH 1/8] Fix rt_rq->pushable_tasks initialization in init_rt_rq() Fabio Checconi
2009-07-09 10:43 ` Peter Zijlstra
2009-07-10 10:41 ` [tip:sched/urgent] sched: " tip-bot for Fabio Checconi
2009-06-15 19:05 ` [PATCH 2/8] Fix hrtick handling Fabio Checconi
2009-07-09 10:42 ` Peter Zijlstra
2009-06-15 19:06 ` [PATCH 3/8] Replace struct prio_array with an RB tree Fabio Checconi
2009-06-15 19:06 ` [PATCH 4/8] Remove the balancing logic Fabio Checconi
2009-06-15 19:08 ` [PATCH 5/8] Use EDF to throttle RT tasks hierarchically Fabio Checconi
2009-06-15 19:08 ` [PATCH 6/8] Modify the curr/next priority tracking Fabio Checconi
2009-06-15 19:09 ` [PATCH 7/8] Reprogram timers only when necessary Fabio Checconi
2009-06-15 19:09 ` [PATCH 8/8] Use hrtick when available Fabio Checconi
2009-07-09 10:36 ` [RFC][PATCH 0/8] Use EDF to throttle RT task groups Peter Zijlstra
2009-07-09 13:51 ` Fabio Checconi
2009-07-15 7:50 ` Peter Zijlstra
2009-07-15 12:08 ` Fabio Checconi
2009-07-15 14:25 ` Peter Zijlstra [this message]
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