SLUB: Improve hackbench speed

Increase the mininum number of partial slabs to keep around and put
partial slabs to the end of the partial queue so that they can add
more objects.
Signed-off-by: NChristoph Lameter <clameter@sgi.com>
Reviewed-by: NPekka Enberg <penberg@cs.helsinki.fi>
Acked-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/slub.c

@@ -172,7 +172,7 @@ static inline void ClearSlabDebug(struct page *page)
  * Mininum number of partial slabs. These will be left on the partial
  * lists even if they are empty. kmem_cache_shrink may reclaim them.
  */
-#define MIN_PARTIAL 2
+#define MIN_PARTIAL 5
 
 /*
  * Maximum number of desirable partial slabs.
@@ -1613,7 +1613,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
 	 * then add it.
 	 */
 	if (unlikely(!prior))
-		add_partial(get_node(s, page_to_nid(page)), page);
+		add_partial_tail(get_node(s, page_to_nid(page)), page);
 
 out_unlock:
 	slab_unlock(page);