On Wed, Mar 27, 2013 at 05:29:19PM -0400, Naoya Horiguchi wrote: ... > > If we made sure that all page on the hugepage_freelists have reference > > 0 (which is now not the case and it is yet another source of confusion) > > then the whole loop could be replaced by page_count check. > > I think that free hugepages have refcount 0, but hwpoisoned hugepages > have also refcount 0. But hwpoison can happen only on limited hardware > and we consider them as exceptional, so replacing page_count check and > checking PG_hwpoisoned flag looks more reasonable to me. Sorry, my mistake. Hwpoisoned hugepages have refcount 1, so there's no problem on using page_count check. 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>