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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>