Re: Hotplug CPU Boot Changes: BEWARE

Keith Owens (kaos@ocs.com.au)
Sat, 08 Jun 2002 11:55:09 +1000

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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