set use_alien_caches to 0 on non NUMA platforms. And avoid calling
the cache_free_alien() when use_alien_caches is not set. This will avoid
the cache miss that happens while dereferencing slabp to get nodeid.

Signed-off-by: Suresh Siddha <[EMAIL PROTECTED]>
---

diff --git a/mm/slab.c b/mm/slab.c
index 8fdaffa..146082d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1146,7 +1146,7 @@ static inline int cache_free_alien(struct kmem_cache 
*cachep, void *objp)
         * Make sure we are not freeing a object from another node to the array
         * cache on this cpu.
         */
-       if (likely(slabp->nodeid == node) || unlikely(!use_alien_caches))
+       if (likely(slabp->nodeid == node))
                return 0;
 
        l3 = cachep->nodelists[node];
@@ -1394,6 +1394,9 @@ void __init kmem_cache_init(void)
        int order;
        int node;
 
+       if (num_possible_nodes() == 1)
+               use_alien_caches = 0;
+
        for (i = 0; i < NUM_INIT_LISTS; i++) {
                kmem_list3_init(&initkmem_list3[i]);
                if (i < MAX_NUMNODES)
@@ -3563,7 +3566,7 @@ static inline void __cache_free(struct kmem_cache 
*cachep, void *objp)
        check_irq_off();
        objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
 
-       if (cache_free_alien(cachep, objp))
+       if (use_alien_caches && cache_free_alien(cachep, objp))
                return;
 
        if (likely(ac->avail < ac->limit)) {
-
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