[RFC V2 SLEB 05/14] SLUB: is_kmalloc_cache

[Christoph Lameter <cl@linux.com>]

[-- Attachment #1: slub_is_kmalloc_cache --]
[-- Type: text/plain, Size: 1614 bytes --]

The determination if a slab is a kmalloc slab is occurring
multiple times.

Signed-off-by: Christoph Lameter <cl@linux-foundation.org>


---
 mm/slub.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2010-05-12 14:46:58.000000000 -0500
+++ linux-2.6/mm/slub.c	2010-05-12 14:49:37.000000000 -0500
@@ -312,6 +312,11 @@ static inline int oo_objects(struct kmem
 	return x.x & OO_MASK;
 }
 
+static int is_kmalloc_cache(struct kmem_cache *s)
+{
+	return (s < kmalloc_caches + KMALLOC_CACHES && s >= kmalloc_caches);
+}
+
 #ifdef CONFIG_SLUB_DEBUG
 /*
  * Debug settings:
@@ -2076,7 +2081,7 @@ static DEFINE_PER_CPU(struct kmem_cache_
 
 static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags)
 {
-	if (s < kmalloc_caches + KMALLOC_CACHES && s >= kmalloc_caches)
+	if (is_kmalloc_cache(s))
 		/*
 		 * Boot time creation of the kmalloc array. Use static per cpu data
 		 * since the per cpu allocator is not available yet.
@@ -2158,8 +2163,7 @@ static int init_kmem_cache_nodes(struct 
 	int node;
 	int local_node;
 
-	if (slab_state >= UP && (s < kmalloc_caches ||
-			s >= kmalloc_caches + KMALLOC_CACHES))
+	if (slab_state >= UP && !is_kmalloc_cache(s))
 		local_node = page_to_nid(virt_to_page(s));
 	else
 		local_node = 0;

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