> There are obviously no x64 boxes around at the moment with >1TB of regular
quoted text
> shared memory, since no CPUs have more than 40 address lines. 100+TB RAM is

That's actually not true.

quoted text
> surely years away.

Yes, but why build something non scalable now that you have to fix in a few
years?  Especially when it comes with "i have no justification" in
the commit log.

quoted text
> > So far we always that 64bit Linux can support upto 1/4*max VA memory.
> > With your change that formula would be not true anymore.
> 
> Does the formula have any practical significance?

Yes, because getting more than 48bits of VA will be extremly costly
in terms of infrastructure and assuming continuing growth rates and very large
machines 46bits is not all that much.

-Andi
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