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authorChristoph Lameter <clameter@sgi.com>2008-04-14 19:53:02 +0400
committerPekka Enberg <penberg@cs.helsinki.fi>2008-04-14 19:53:02 +0400
commit0f389ec63077521166f071e1e970aed36147fd45 (patch)
treeb1f2159c652c48160dde31e6740870ae0589dffb /include/linux/slub_def.h
parent49bd5221ce8fb55d12c04a3ffd375201c5bbfb7a (diff)
downloadlinux-0f389ec63077521166f071e1e970aed36147fd45.tar.xz
slub: No need for per node slab counters if !SLUB_DEBUG
The per node counters are used mainly for showing data through the sysfs API. If that API is not compiled in then there is no point in keeping track of this data. Disable counters for the number of slabs and the number of total slabs if !SLUB_DEBUG. Incrementing the per node counters is also accessing a potentially contended cacheline so this could actually be a performance benefit to embedded systems. SLABINFO support is also affected. It now must depends on SLUB_DEBUG (which is on by default). Patch also avoids a check for a NULL kmem_cache_node pointer in new_slab() if the system is not compiled with NUMA support. [penberg@cs.helsinki.fi: fix oops and move ->nr_slabs into CONFIG_SLUB_DEBUG] Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Diffstat (limited to 'include/linux/slub_def.h')
-rw-r--r--include/linux/slub_def.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index b00c1c73eb0a..79d59c937fac 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -45,9 +45,9 @@ struct kmem_cache_cpu {
struct kmem_cache_node {
spinlock_t list_lock; /* Protect partial list and nr_partial */
unsigned long nr_partial;
- atomic_long_t nr_slabs;
struct list_head partial;
#ifdef CONFIG_SLUB_DEBUG
+ atomic_long_t nr_slabs;
struct list_head full;
#endif
};