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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1252399347.7746.19.camel@twins>
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

--
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/