linux-kernel - Re: [PATCH 04/16] slab: remove nodeid in struct slab

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Date:	Thu, 22 Aug 2013 17:51:58 +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>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/16] slab: remove nodeid in struct slab

On Thu, 22 Aug 2013, Joonsoo Kim wrote:

> @@ -1099,8 +1098,7 @@ static void drain_alien_cache(struct kmem_cache *cachep,
>
>  static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
>  {
> -	struct slab *slabp = virt_to_slab(objp);
> -	int nodeid = slabp->nodeid;
> +	int nodeid = page_to_nid(virt_to_page(objp));
>  	struct kmem_cache_node *n;
>  	struct array_cache *alien = NULL;
>  	int node;

virt_to_page is a relatively expensive operation. How does this affect
performance?
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