On Tue, Jul 08, 2014 at 10:30:38AM +0900, Minchan Kim wrote: > Actually, I did but found no problem except CONFIG_DEBUG_VM but rollback > after peeking [1]. > When I read the description in detail by your review, I think we can remove > BUG_ON(PageTransHuge(page)) in try_to_unmap and go with no split for lazyfree > page because they are not in swapcache any more so the assumption of [1] is > not valid. Will do it in next revision. No. try_to_unmap() knows nothing about PMDs, so page_check_address() will always return NULL for THP and you will not unmap anything. -- Kirill A. Shutemov -- 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>