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SubjectRe: [PATCH 0/4] Allow CPU0 to be nohz full
On Thu, 4 Apr 2019, Nicholas Piggin wrote:

> I've been looking at ways to fix suspend breakage with CPU0 as a
> nohz CPU. I started looking at various things like allowing CPU0
> to take over do_timer again temporarily or allowing nohz full
> to be stopped at runtime (that is quite a significant change for
> little real benefit). The problem then was having the housekeeping
> CPU go offline.
> So I decided to try just allowing the freeze to occur on non-zero
> CPU. This seems to be a lot simpler to get working, but I guess
> some archs won't be able to deal with this? Would it be okay to
> make it opt-in per arch?

It needs to be opt in. x86 will fall on its nose with that.

Now the real interesting question is WHY do we need that at all?



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