Re: 4level page tables for Linux

[linux]

> Numbers for all of them would be easy to deal with.
> Like this: pd1, pd2, pd3, pd4...
> 
> I'd number going toward the page, because that's
> the order in which these things get walked.

On the other hand, these extensions tend to get made to the top,
and it's confusing if, in a 2-level system, only pd3 and pd4 are used.

Perhaps a little-endian scheme (pd1 = pte, pt2=pmd, pd4=pgd) would
be better after all.
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