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Date: Fri, 23 Aug 2013 23:24:45 +0900 From: JoonSoo Kim <js1304@...il.com> To: Christoph Lameter <cl@...ux.com> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>, Pekka Enberg <penberg@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, Linux Memory Management List <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 05/16] slab: remove cachep in struct slab_rcu 2013/8/23 Christoph Lameter <cl@...ux.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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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