Hi Rafael,

Thank you so much for your reply.

At 03/13/2018 05:25 PM, Rafael J. Wysocki wrote:
On Tue, Mar 13, 2018 at 4:11 AM, Dou Liyang <douly.f...@cn.fujitsu.com> wrote:
Hi Thomas,

At 03/09/2018 11:08 PM, Thomas Gleixner wrote:

I'm not sure if there is a clear indicator whether physcial hotplug is
supported or not, but the ACPI folks (x86) and architecture maintainers

+cc Rafael

should be able to answer that question. I have a machine which says:

     smpboot: Allowing 128 CPUs, 96 hotplug CPUs

There is definitely no way to hotplug anything on that machine and sure

AFAIK, in ACPI based dynamic reconfiguration, there is no clear
indicator. In theory, If the ACPI tables have the hotpluggable
CPU resources, the OS can support physical hotplug.

In order for the ACPI-based CPU hotplug (I mean physical, not just the
software offline/online we do in the kernel) to work, there have to be
objects in the ACPI namespace corresponding to all of the processors
in question.

If they are not present, there is no way to signal insertion and eject
the processors safely.

Yes, I see.


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