On Wed, 20 Jul 2011, Eric Dumazet wrote:

quoted

Slab's kmem_cache is configured with an array of NR_CPUS which is the
maximum nr of cpus supported. Some distros support 4096 cpus in order to
accomodate SGI machines. That array then will have the size of 4096 * 8 =
32k

We currently support a dynamic schem for the possible nodes :

cache_cache.buffer_size = offsetof(struct kmem_cache, nodelists) +
	nr_node_ids * sizeof(struct kmem_list3 *);

We could have a similar trick to make the real size both depends on
nr_node_ids and nr_cpu_ids.

(struct kmem_cache)->array would become a pointer.

We should be making it a per cpu pointer like slub then. I looked at what
it would take to do so a couple of month ago but it was quite invasive.

The other solution is to use slub instead.

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