linux-kernel - Re: question on sched-rt group allocation cap: sched_rt_runtime

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Date:	Tue, 08 Sep 2009 10:42:27 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Anirban Sinha <ani@...rban.org>
Cc:	Anirban Sinha <ASinha@...gmasystems.com>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, Dario Faggioli <raistlin@...ux.it>
Subject: Re: question on sched-rt group allocation cap: sched_rt_runtime_us

On Tue, 2009-09-08 at 00:08 -0700, Anirban Sinha wrote:

> > Actually there is, use cpusets to carve the system into partitions.
> 
> hmm. ok. I looked at the code a little bit. It seems to me that the  
> 'borrowing' of RT runtimes occurs only from rt runqueues belonging to  
> the same root domain. And partition_sched_domains() is the only  
> external interface that can be used to create root domain out of a CPU  
> set. But then I think it needs to have CGROUPS/USER groups enabled?  
> Right?

No you need cpusets, you create a partition by disabling load-balancing
on the top set, thereby only allowing load-balancing withing the
children.

The runtime sharing is a form of load-balancing.

CONFIG_CPUSETS=y

Documentation/cgroups/cpusets.txt

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