Re: [Xen-devel] Converting heap page_infos to contiguous virtual

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.07.16 at 22:02, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 13/07/16 20:44, Boris Ostrovsky wrote:
>>  Do I need to account for the PDX hole?
> 
> Jan is probably the best person to ask about this, but I am failure sure
> there are lurking dragons here.

I don't think there are - contiguous chunks of pages can't have a PDX
hole in their middle. There would be two parts (before and after the
hole), and no allocation can return two such parts.

Furthermore PDX compression actually _reduces_ holes, i.e. there
might only be a case where physical addresses are discontiguous
yet virtual ones are contiguous, but never the other way around.

Jan


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