linux-kernel - Re: [PATCH v6 19/29] memcg: infrastructure to match an allocation to the right cache

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Message-Id: <20121105162837.5fdac20c.akpm@linux-foundation.org>
Date:	Mon, 5 Nov 2012 16:28:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Tejun Heo <tj@...nel.org>, Michal Hocko <mhocko@...e.cz>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>,
	JoonSoo Kim <js1304@...il.com>
Subject: Re: [PATCH v6 19/29] memcg: infrastructure to match an allocation
 to the right cache

On Thu,  1 Nov 2012 16:07:35 +0400
Glauber Costa <glommer@...allels.com> wrote:

> +static __always_inline struct kmem_cache *
> +memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)

I still don't understand why this code uses __always_inline so much.

I don't recall seeing the compiler producing out-of-line versions of
"static inline" functions (and perhaps it has special treatment for
functions which were defined in a header file?).

And if the compiler *does* decide to uninline the function, perhaps it
knows best, and the function shouldn't have been declared inline in the
first place.

If it is indeed better to use __always_inline in this code then we have
a heck of a lot of other "static inline" definitions whcih we need to
convert!  So, what's going on here?

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