linux-kernel - [PATCH 3/9] slab: move up code to get kmem_cache_node in free

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Message-Id: <1392361043-22420-4-git-send-email-iamjoonsoo.kim@lge.com>
Date:	Fri, 14 Feb 2014 15:57:17 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 3/9] slab: move up code to get kmem_cache_node in free_block()

node isn't changed, so we don't need to retreive this structure
everytime we move the object. Maybe compiler do this optimization,
but making it explicitly is better.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

diff --git a/mm/slab.c b/mm/slab.c
index 6d17cad..53d1a36 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3361,6 +3361,7 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects,
 	int i;
 	struct kmem_cache_node *n;
 
+	n = cachep->node[node];
 	for (i = 0; i < nr_objects; i++) {
 		void *objp;
 		struct page *page;
@@ -3368,7 +3369,6 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects,
 		objp = clear_obj_pfmemalloc(objpp[i]);
 
 		page = virt_to_head_page(objp);
-		n = cachep->node[node];
 		list_del(&page->lru);
 		check_spinlock_acquired_node(cachep, node);
 		slab_put_obj(cachep, page, objp, node);
-- 
1.7.9.5

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