Re: quicklists confuse meminfo

[Jeremy Fitzhardinge]

H. Peter Anvin wrote:
> Jeremy Fitzhardinge wrote:
> > Yeah, the most fundamental problem is that the whole page is RO, so 
> > even if Xen trapped and emulated, it still makes a very bad 
> > neighbour.  I was also going to say that there's no reason why you 
> > couldn't pack multiple pgds into one page, but I think we can only 
> > specify the cr3 at page resolution anyway.
>
> Wrong.  With PAE you can specify it at any 32-byte boundary. 

Yes, the x86 lets you, but Xen doesn't - mostly because it reuses the 
lower 12 bits as upper bits of the pfn so that you can specify a 
pagetable base at >4G.

   J
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