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

[Peter Zijlstra]

On Tue, 2012-06-05 at 19:54 +0000, Luck, Tony wrote:

> 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).

Right, performance is completely irrelevant in this case. In fact, the
current code should work perfectly fine for you -- except for the whole
BSP nightmare x86 has.

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

They're bloody insane, or working with broken hardware.
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