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Commit 62918a03 authored by Siddha, Suresh B's avatar Siddha, Suresh B Committed by Andi Kleen
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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: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarAndi 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 57a4f91a

mm/slab.c

+5 −2
Original line number Diff line number Diff line
@@ -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)) {