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SubjectRe: [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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