Hi Naoya, On 03/21/2013 05:53 AM, Naoya Horiguchi wrote: > 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. Could you point out to me which code in function migration_entry_wait() lead to return 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>