> > It's odd that just checking if some pages are huge should be that > > expensive, but ok .. > > Yeah, I was surprised as well but profiles were pretty clear on this - part > of the slowdown was caused by loads of page->_compound_head (PageTail() > and page_compound() use that) which we previously didn't have to load at > all, part was in hpage_nr_pages() function and its use. A strategic early prefetch may help. -Andi -- 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>
