Messages in this thread Patch in this message |  | | | From | Andi Kleen <> | | Subject | [PATCH] [25/34] x86_64: skip cache_free_alien() on non NUMA | | Date | Mon, 30 Apr 2007 17:49:58 +0200 (CEST) |
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From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
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 <suresh.b.siddha@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <andi@firstfloor.org> Cc: Eric Dumazet <dada1@cosmosbay.com> Cc: David Rientjes <rientjes@google.com> Cc: Christoph Lameter <clameter@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> --- mm/slab.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) Index: linux/mm/slab.c =================================================================== --- linux.orig/mm/slab.c +++ linux/mm/slab.c @@ -1146,7 +1146,7 @@ static inline int cache_free_alien(struc * 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 k 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)) { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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