On Wed, 11 Dec 2013, Dave Hansen wrote: > > The write-argument to cmpxchg_double() must be 16-byte aligned. > We used to align 'struct page' itself in order to guarantee this, > but that wastes 8-bytes per page. Instead, we take 8-bytes > internal to the page before page->counters and move freelist > between there and the existing 8-bytes after counters. That way, > no matter how 'stuct page' itself is aligned, we can ensure that > we have a 16-byte area with which to to this cmpxchg. Well this adds additional branching to the fast paths. -- 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>