Messages in this thread | | | Date | Fri, 23 Aug 2013 23:24:45 +0900 | Subject | Re: [PATCH 05/16] slab: remove cachep in struct slab_rcu | From | JoonSoo Kim <> |
| |
2013/8/23 Christoph Lameter <cl@linux.com>: > 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.
| |