Messages in this thread | | | Date | Mon, 7 Apr 2014 16:32:39 +0100 | From | David Vrabel <> | Subject | Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels |
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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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