On Tue, Dec 09, 2014 at 03:40:35PM +0800, Weijie Yang wrote: > If the free page and its buddy has different zone id, the current > zone->lock cann't prevent buddy page getting allocated, this could > trigger VM_BUG_ON_PAGE in a very tiny chance: > Under what circumstances can a buddy page be allocated without the zone->lock? Any parallel allocation from that zone that takes place will be from the per-cpu allocator and should not be affected by this. Have you actually hit this race? -- 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>