Date: Wed, 18 Oct 2006 11:05:54 -0700
From: Paul Jackson <pj@sgi.com>
To: dino@in.ibm.com
Cc: suresh.b.siddha@intel.com, menage@google.com, Simon.Derr@bull.net,
       linux-kernel@vger.kernel.org, mbligh@google.com, rohitseth@google.com,
       dipankar@in.ibm.com, nickpiggin@yahoo.com.au
Subject: Re: exclusive cpusets broken with cpu hotplug
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	<20061018175458.GC7885@in.ibm.com>
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Dinakar wrote:
> I have a patch (though a very old one...) for handling hotplug and cpusets.
> However there were some ugly locking issues and nesting of locks ...

The interaction of cpusets and hotplug should be in good shape.  Look
in kernel/cpuset.c for CONFIG_HOTPLUG_CPU and CONFIG_MEMORY_HOTPLUG,
and you will see the two routines to call for cpu and memory hotplug
events, cpuset_handle_cpuhp() and cpuset_track_online_nodes().

The problem area is the interaction of dynamic sched domains and
cpusets with hot plug events.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401
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