linux-kernel - Re: [PATCH 05/16] slab: remove cachep in struct slab

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Message-ID: <00000140ab69e6be-3b2999b6-93b4-4b22-a91f-8929aee5238f-000000@email.amazonses.com>
Date:	Fri, 23 Aug 2013 13:42:59 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/16] slab: remove cachep in struct slab_rcu

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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