From 62918a036148230ba1ad175dc8a0952e3752ac57 Mon Sep 17 00:00:00 2001 From: "Siddha, Suresh B" Date: Wed, 2 May 2007 19:27:18 +0200 Subject: [PATCH] [PATCH] x86-64: skip cache_free_alien() on non NUMA 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 Signed-off-by: Andi Kleen Cc: Andi Kleen Cc: Eric Dumazet Cc: David Rientjes Cc: Christoph Lameter Signed-off-by: Andrew Morton --- mm/slab.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index 4cbac24ae2f..168bfe9d8ff 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)) { -- 2.39.5