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authorMel Gorman <mel@csn.ul.ie>2009-06-17 00:32:16 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-17 04:47:35 +0200
commitb6e68bc1baed9b6972a250aba66b8c5276cf6fb1 (patch)
tree193af67b8333417347b9324e4bf9963d7cf0a872 /mm
parentpage allocator: use a pre-calculated value instead of num_online_nodes() in f... (diff)
downloadlinux-b6e68bc1baed9b6972a250aba66b8c5276cf6fb1.tar.xz
linux-b6e68bc1baed9b6972a250aba66b8c5276cf6fb1.zip
page allocator: slab: use nr_online_nodes to check for a NUMA platform
SLAB currently avoids checking a bitmap repeatedly by checking once and storing a flag. When the addition of nr_online_nodes as a cheaper version of num_online_nodes(), this check can be replaced by nr_online_nodes. (Christoph did a patch that this is lifted almost verbatim from) Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/slab.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/mm/slab.c b/mm/slab.c
index bb3254c95cd2..744ab9a665a2 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -898,7 +898,6 @@ static void __slab_error(const char *function, struct kmem_cache *cachep,
*/
static int use_alien_caches __read_mostly = 1;
-static int numa_platform __read_mostly = 1;
static int __init noaliencache_setup(char *s)
{
use_alien_caches = 0;
@@ -1457,10 +1456,8 @@ void __init kmem_cache_init(void)
int order;
int node;
- if (num_possible_nodes() == 1) {
+ if (num_possible_nodes() == 1)
use_alien_caches = 0;
- numa_platform = 0;
- }
for (i = 0; i < NUM_INIT_LISTS; i++) {
kmem_list3_init(&initkmem_list3[i]);
@@ -3590,7 +3587,7 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp)
* variable to skip the call, which is mostly likely to be present in
* the cache.
*/
- if (numa_platform && cache_free_alien(cachep, objp))
+ if (nr_online_nodes > 1 && cache_free_alien(cachep, objp))
return;
if (likely(ac->avail < ac->limit)) {