Re: [PATCH 1/4] slub: change declare of get_slab() to inline at alltimes

[Christoph Lameter]

On Sun, 10 Jun 2012, JoonSoo Kim wrote:

> 2012/6/9 Christoph Lameter <cl@xxxxxxxxx>:
> > 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)

Yea I thought about removing those since I would think that the compiler
should be doing the right thing.

Does gcc inline with higher optimization settings?

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