RE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait ornmi

[Luck, Tony]

> I'm working on a proper state machine driven online/offline sequence,
> where you can put the cpu into an intermediate state which avoids
> bringing it down completely. This is enough to get the full
> powersaving benefits w/o having to go through all the synchronization
> states of a full online/offline. That will shorten the onlining time
> of an previously offlined cpu to almost nothing.

Will this also be a step towards Fenghua's goal of being able to
take cpu#0 away. I.e. will your state machine be fully symmetric
and allow for cpu#0 to enter this intermediate mostly-offline state?

-Tony
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