On Fri, Aug 21, 2015 at 11:11:27AM -0500, Christoph Lameter wrote: > On Fri, 21 Aug 2015, Kirill A. Shutemov wrote: > > > > Is this really true? For example if it's a slab page, will that page > > > ever be inspected by code which is looking for the PageTail bit? > > > > +Christoph. > > > > What we know for sure is that space is not used in tail pages, otherwise > > it would collide with current compound_dtor. > > Sl*b allocators only do a virt_to_head_page on tail pages. The question was whether it's safe to assume that the bit 0 is always zero in the word as this bit will encode PageTail(). -- 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>