slub: per cpu partial statistics change

This patch split the cpu_partial_free into 2 parts: cpu_partial_node, PCP refilling
times from node partial; and same name cpu_partial_free, PCP refilling times in
slab_free slow path. A new statistic 'cpu_partial_drain' is added to get PCP
drain to node partial times. These info are useful when do PCP tunning.

The slabinfo.c code is unchanged, since cpu_partial_node is not on slow path.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a32bcfdc7834..6388a6681af1 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -21,7 +21,7 @@ enum stat_item {
         FREE_FROZEN,            /* Freeing to frozen slab */
         FREE_ADD_PARTIAL,       /* Freeing moves slab to partial list */
         FREE_REMOVE_PARTIAL,    /* Freeing removes last object */
-        ALLOC_FROM_PARTIAL,     /* Cpu slab acquired from partial list */
+        ALLOC_FROM_PARTIAL,     /* Cpu slab acquired from node partial list */
         ALLOC_SLAB,             /* Cpu slab acquired from page allocator */
         ALLOC_REFILL,           /* Refill cpu slab from slab freelist */
         ALLOC_NODE_MISMATCH,    /* Switching cpu slab */
@@ -37,7 +37,9 @@ enum stat_item {
         CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
         CMPXCHG_DOUBLE_FAIL,    /* Number of times that cmpxchg double did not match */
         CPU_PARTIAL_ALLOC,      /* Used cpu partial on alloc */
-        CPU_PARTIAL_FREE,       /* USed cpu partial on free */
+        CPU_PARTIAL_FREE,       /* Refill cpu partial on free */
+        CPU_PARTIAL_NODE,       /* Refill cpu partial from node partial */
+        CPU_PARTIAL_DRAIN,      /* Drain cpu partial to node partial */
         NR_SLUB_STAT_ITEMS };
 
 struct kmem_cache_cpu {