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SubjectRE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi
Date
> But given that you care about how fast a cpu can come up again, this
> seems to be exactly what you want. You want to adapt to load fast, so
> why bother going through userspace and wrecking bits in between?

There are multiple needs here - that appear to have some significant
overlap (re-routing interrupts, stopping scheduling).

My need is for RAS reasons to take a cpu offline - and since
it is broken, I'm not going to bring it back again (at least not anytime
soon - perhaps a service engineer will drive by in a few hours, pull out
the broken cpu, put in a new one, and then bring that online ... but
saving a few milli-seconds in this use case it pointless).

Other people want to do this for power saving. They probably do care
how fast the processor can be brought back.

-Tony


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