linux-kernel - Re: [RFC/PATCH] cpuset: cpuset irq affinities

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Message-Id: <20080303113621.1dfdda87.pj@sgi.com>
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
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