Re: [PATCH 05/16] slab: remove cachep in struct slab_rcu

[Christoph Lameter]

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.

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