Messages in this thread | | | Subject | Re: [PATCH V3 0/4] genirq/affinity: irq vector spread among online CPUs as far as possible | From | Dou Liyang <> | Date | Wed, 14 Mar 2018 11:30:56 +0800 |
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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.fnst@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 >>> the >> >> >> 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.
Thanks dou
> > >
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