Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels

[David Vrabel]

On 07/04/14 16:10, Mel Gorman wrote:
> _PAGE_NUMA is currently an alias of _PROT_PROTNONE to trap NUMA hinting
> faults. As the bit is shared care is taken that _PAGE_NUMA is only used in
> places where _PAGE_PROTNONE could not reach but this still causes problems
> on Xen and conceptually difficult.

The problem with Xen guests occurred because mprotect() /was/ confusing
PROTNONE mappings with _PAGE_NUMA and clearing the non-existant NUMA hints.

David
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