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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2010-05-21 14:41:35 -0700 |
|---|---|---|
| committer | Pekka Enberg <penberg@cs.helsinki.fi> | 2010-05-24 21:11:29 +0300 |
| commit | 73367bd8eef4f4eb311005886aaa916013073265 (patch) | |
| tree | d603667689cfea1d8de49fe3c7fada7f6b6eae53 /include | |
| parent | 7e125f7b9cbfce4101191b8076d606c517a73066 (diff) | |
| download | op-kernel-dev-73367bd8eef4f4eb311005886aaa916013073265.zip op-kernel-dev-73367bd8eef4f4eb311005886aaa916013073265.tar.gz | |
slub: move kmem_cache_node into it's own cacheline
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
Cc: <stable@kernel.org>
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>
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 55695c8..6ac3766 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 }; |
