On Wed, 18 Dec 2013, Dave Hansen wrote: > On 12/18/2013 04:41 PM, Andrew Morton wrote: > >> > Unless somebody can find some holes in this, I think we have no choice > >> > but to unset the HAVE_ALIGNED_STRUCT_PAGE config option and revert using > >> > the cmpxchg, at least for now. > > > > So your scary patch series which shrinks struct page while retaining > > the cmpxchg_double() might reclaim most of this loss? > > That's what I'll test next, but I hope so. > > The config tweak is important because it shows a low-risk way to get a > small 'struct page', plus get back some performance that we lost and > evidently never noticed. A distro that was nearing a release might want > to go with this, for instance. Ok then lets just drop the cmpxchg updates to the page struct. The spinlock code is already in there so just removing the __CMPXCHG flag related processing should do the trick. -- 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>