linux-kernel - [PATCH v2] change alloc function in alloc_slab

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Date:	Wed, 14 Apr 2010 23:58:36 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <lliubbo@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Minchan Kim <minchan.kim@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: [PATCH v2] change alloc function in alloc_slab_page

V2
* change changelog
* Add some reviewed-by 

alloc_slab_page always checks nid == -1, so alloc_page_node can't be
called with -1. 
It means node's validity check in alloc_pages_node is unnecessary. 
So we can use alloc_pages_exact_node instead of alloc_pages_node. 
It could avoid comparison and branch as 6484eb3e2a81807722 tried.

Cc: Pekka Enberg <penberg@...helsinki.fi>
Cc: Christoph Lameter <cl@...ux-foundation.org>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Reviewed-by: Mel Gorman <mel@....ul.ie>
---
 mm/slub.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index b364844..9984165 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1084,7 +1084,7 @@ static inline struct page *alloc_slab_page(gfp_t flags, int node,
 	if (node == -1)
 		return alloc_pages(flags, order);
 	else
-		return alloc_pages_node(node, flags, order);
+		return alloc_pages_exact_node(node, flags, order);
 }
 
 static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
-- 
1.7.0.5

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