> > In that case the "we need suspend to be invisible to userspace" as a
> > reason to use the freezer would also be moot, since if you don't
> > schedule userspace after offlining the CPUs, it can't notice this.
> 
> After? Can you do the offlining atomically?

Don't know.  Wait for all CPUs to reach a scheduling point and then
take them offline?  Doesn't sound too difficult.

Miklos
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