diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2010-05-21 14:41:35 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:22:37 -0700 |
| commit | 68b99fb8e1e21209c9cad878e99947613e445777 (patch) | |
| tree | 1b389b662906c5acddcc707cf78ee561581684eb /include | |
| parent | 0d28a228f4fc8d88deaafa4c284385271a84da5c (diff) | |
slub: move kmem_cache_node into it's own cacheline
commit 73367bd8eef4f4eb311005886aaa916013073265 upstream.
This patch is meant to improve the performance of SLUB by moving the local
kmem_cache_node lock into it's own cacheline separate from kmem_cache.
This is accomplished by simply removing the local_node when NUMA is enabled.
On my system with 2 nodes I saw around a 5% performance increase w/
hackbench times dropping from 6.2 seconds to 5.9 seconds on average. I
suspect the performance gain would increase as the number of nodes
increases, but I do not have the data to currently back that up.
Bugzilla-Reference: http://bugzilla.kernel.org/show_bug.cgi?id=15713
Reported-by: Alex Shi <alex.shi@intel.com>
Tested-by: Alex Shi <alex.shi@intel.com>
Acked-by: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/slub_def.h | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 67cbb7d4e513..c3dc7e106f33 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -75,12 +75,6 @@ struct kmem_cache { int offset; /* Free pointer offset. */ struct kmem_cache_order_objects oo; - /* - * Avoid an extra cache line for UP, SMP and for the node local to - * struct kmem_cache. - */ - struct kmem_cache_node local_node; - /* Allocation and freeing of slabs */ struct kmem_cache_order_objects max; struct kmem_cache_order_objects min; @@ -102,6 +96,9 @@ struct kmem_cache { */ int remote_node_defrag_ratio; struct kmem_cache_node *node[MAX_NUMNODES]; +#else + /* Avoid an extra cache line for UP */ + struct kmem_cache_node local_node; #endif }; |