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SubjectRe: quicklists confuse meminfo
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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