add kmem_cache_alloc_node

Hi Andrew,

the attached patch adds a simple kmem_cache_alloc_node function: allocate memory on a given node. The function is intended for cpu bound structures. It's used for alloc_percpu and for the slab-internal per-cpu structures. Jack Steiner reported a ~3% performance increase for AIM7 on a 64-way Itanium 2.

Andrew, could you add it to your -mm tree?

Port maintainers: The patch could cause problems if CPU_UP_PREPARE is called for a cpu on a node before the corresponding memory is attached and/or if alloc_pages_node doesn't fall back to memory from another node if there is no memory in the requested node. I think noone does that, but I'm not sure.

--
Manfred

// $Header$
// Kernel Version:

//  VERSION = 2
//  PATCHLEVEL = 6
//  SUBLEVEL = 6
//  EXTRAVERSION = -mm2

@@ -61,6 +61,7 @@
 extern int kmem_cache_destroy(kmem_cache_t *);
 extern int kmem_cache_shrink(kmem_cache_t *);
 extern void *kmem_cache_alloc(kmem_cache_t *, int);
+extern void *kmem_cache_alloc_node(kmem_cache_t *, int);
 extern void kmem_cache_free(kmem_cache_t *, void *);
 extern unsigned int kmem_cache_size(kmem_cache_t *);