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

[Peter Zijlstra]

On Tue, 2012-06-05 at 17:44 +0000, Luck, Tony wrote:
> The scheduler may assign a process to run on it, which will wake it up
> to use power.

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?
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