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

[Luck, Tony]

> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/