2013/8/23 Christoph Lameter <cl@xxxxxxxxx>: > On Fri, 23 Aug 2013, Joonsoo Kim wrote: > >> On Thu, Aug 22, 2013 at 05:53:00PM +0000, Christoph Lameter wrote: >> > On Thu, 22 Aug 2013, Joonsoo Kim wrote: >> > >> > > We can get cachep using page in struct slab_rcu, so remove it. >> > >> > Ok but this means that we need to touch struct page. Additional cacheline >> > in cache footprint. >> >> In following patch, we overload RCU_HEAD to LRU of struct page and >> also overload struct slab to struct page. So there is no >> additional cacheline footprint at final stage. > > If you do not use rcu (standard case) then you have an additional > cacheline. > I don't get it. This patch only affect to the rcu case, because it change the code which is in kmem_rcu_free(). It doesn't touch anything in standard case. Thanks. -- 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>