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[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 <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>
This commit is contained in:
Siddha, Suresh B 2007-05-02 19:27:18 +02:00 committed by Andi Kleen
parent 57a4f91ae5
commit 62918a0361
1 changed files with 5 additions and 2 deletions
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7
mm/slab.c
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@ -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)) {