On Wed, 30 Jul 2014, Kirill A. Shutemov wrote: > > Hmm, I'm confused at how that could be true, could you explain what > > memory other than thp can return true for PageTransHuge()? > > PageTransHuge() will be true for any head of compound page if THP is > enabled compile time: hugetlbfs, slab, whatever. > I was meaning in the context of the patch :) Since PageLRU is set, that discounts slab so we're left with thp or hugetlbfs. Logically, both should have sizes that are >= the size of the pageblock itself so I'm not sure why we don't unconditionally align up to pageblock_nr_pages here. Is there a legitimiate configuration where a pageblock will span multiple pages of HPAGE_PMD_ORDER? -- 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>