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

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Date:	Sun, 10 Jun 2012 00:57:48 +0900
From:	JoonSoo Kim <js1304@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 1/4] slub: change declare of get_slab() to inline at all times

2012/6/9 Christoph Lameter <cl@...ux.com>:
> On Sat, 9 Jun 2012, Joonsoo Kim wrote:
>
>> -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)
>
> I thought that the compiler felt totally free to inline static functions
> at will? This may be a matter of compiler optimization settings. I can
> understand the use of always_inline in a header file but why in a .c file?

Yes, but the compiler with -O2 doesn't inline get_slab() which
declared just 'static'.
I think that inlining get_slab() have a performance benefit, so add
'__always_inline' to declare of get_slab().
Other functions like slab_alloc, slab_free also use 'always_inline' in
.c file (slub.c)
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