On Wed, Mar 20, 2013 at 07:57:32AM +0800, Simon Jeons wrote: > Hi Naoya, > On 02/22/2013 03:41 AM, Naoya Horiguchi wrote: > >When we have a page fault for the address which is backed by a hugepage > >under migration, the kernel can't wait correctly until the migration > >finishes. This is because pte_offset_map_lock() can't get a correct > > It seems that current hugetlb_fault still wait hugetlb page under > migration, how can it work without lock 2MB memory? Hugetlb_fault() does call migration_entry_wait(), but returns immediately. So page fault happens over and over again until the migration completes. IOW, migration_entry_wait() is now broken for hugepage and doesn't work as expected. Thanks, Naoya -- 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>