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Date: Mon, 3 Mar 2008 11:36:21 -0600 From: Paul Jackson <pj@....com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: maxk@...lcomm.com, mingo@...e.hu, tglx@...utronix.de, oleg@...sign.ru, rostedt@...dmis.org, linux-kernel@...r.kernel.org, rientjes@...gle.com Subject: Re: [RFC/PATCH] cpuset: cpuset irq affinities Peter wrote: > The system group can overlap with anything that does need system services. I suppose IRQs need to overlap like this, but cpusets often can't overlap like this. If a system has the cgroup hierarchy you draw: /cgroup /cgroup/system /cgroup/system/boot /cgroup/big_honking_app /cgroup/rt_domain this must not force the cpuset hierarchy to be: /dev/cpuset /dev/cpuset/system /dev/cpuset/system/boot /dev/cpuset/big_honking_app /dev/cpuset/rt_domain I guess this means IRQs cannot be added to the cpuset subsystem of cgroups. Rather they have to be added to some other cgroup subsystem, perhaps a new one just for IRQs. In perhaps the most common sort of cpuset hierarchy: /dev/cpuset /dev/cpuset/boot /dev/cpuset/batch_sched /dev/cpuset/big_honking_app /dev/cpuset/rt_domain none of boot or its siblings overlap. -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@....com> 1.940.382.4214 -- 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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