linux-kernel - [PATCH 1/4] slub: change declare of get

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Date:	Sat,  9 Jun 2012 02:23:14 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <js1304@...il.com>
Subject: [PATCH 1/4] slub: change declare of get_slab() to inline at all times

__kmalloc and it's variants are invoked much frequently
and these are performance critical functions,
so their callee functions are declared '__always_inline'
But, currently, get_slab() isn't declared '__always_inline'.
In result, __kmalloc and it's variants call get_slab() on x86.
It is not desirable result, so change it to inline at all times.

Signed-off-by: Joonsoo Kim <js1304@...il.com>

diff --git a/mm/slub.c b/mm/slub.c
index 71de9b5..30ceb6d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3320,7 +3320,7 @@ static inline int size_index_elem(size_t bytes)
 	return (bytes - 1) / 8;
 }
 
-static struct kmem_cache *get_slab(size_t size, gfp_t flags)
+static __always_inline struct kmem_cache *get_slab(size_t size, gfp_t flags)
 {
 	int index;
 
-- 
1.7.9.5

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