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From: Keith Owens <kaos@ocs.com.au>
To: linux-kernel@vger.kernel.org
Subject: Re: Hotplug CPU Boot Changes: BEWARE 
In-Reply-To: Your message of "07 Jun 2002 08:51:32 CST."
             <m1elfjw39n.fsf@frodo.biederman.org> 
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Date: Sat, 08 Jun 2002 11:55:09 +1000
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On 07 Jun 2002 08:51:32 -0600, 
ebiederm@xmission.com (Eric W. Biederman) wrote:
>Thinking in terms of physically hot-plugging cpus has me doubt the
>actual utility of this code.  Instead thinking of dynamically enabling
>and disabling processors for debugging sounds very reasonable.

IBM (S390) and SGI hardware.  Virtually disable the cpu so the cpu
partition manager migrates work off the cpu[*].  Vary the cpu offline.
Physically replace the cpu.  Reverse the process.  It all works fine if
the hardware supports it and[*] the OS supports migration off a cpu.

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