On Mon, Feb 18, 2013 at 09:51:44PM -0500, KOSAKI Motohiro wrote: > >> * Hugepage migration ? Currently, hugepage is not migratable and can?t > >> use pages in ZONE_MOVABLE. It is not happy from point of CMA/hotplug > >> view. > >> > > > > migrate_huge_page() ? > > > > It's also possible to allocate hugetlbfs pages in ZONE_MOVABLE but must > > be enabled via /proc/sys/vm/hugepages_treat_as_movable. > > Oops. I missed that. Sorry for noise. > > But but... I wonder why this knob is disabled by default. I don't think anybody > get a benefit form current default. > It's disabled by default simply because at the time the pages were not movable at all. They now should be movable with some additional work and potentially the default could change after that or be removed entirely. -- Mel Gorman SUSE Labs -- 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>