Re: i386 and PAE: pud_present()

[Andi Kleen]

On Sunday 30 April 2006 08:07, Dave McCracken wrote:
> 
> --On Friday, April 28, 2006 10:27:21 +0200 Andi Kleen <ak@xxxxxxx> wrote:
> 
> >> Take a look a little further down the page for the comment.
> >> 
> >> In i386 + PAE, pud is always present.
> > 
> > I think his problem is that the PGD is always present too (in
> > pgtables-nopud.h) Indeed looks strange.
> 
> The PGD is always fully populated on i386 if PAE is enabled.  All three of
> the pmd pages are allocated at page table creation time and persist till
> the page table is deleted.

At least with the new flexmmap it sounds like a waste of memory.

-Andi

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