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

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Date:	Thu, 8 Nov 2012 15:33:54 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Glauber Costa <glommer@...allels.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
	Johannes Weiner <hannes@...xchg.org>,
	Tejun Heo <tj@...nel.org>, 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>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v6 19/29] memcg: infrastructure to match an allocation to
 the right cache

On Thu 08-11-12 12:05:13, Michal Hocko wrote:
> On Tue 06-11-12 09:03:54, Michal Hocko wrote:
> > On Mon 05-11-12 16:28:37, Andrew Morton wrote:
> > > 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.
> > 
> > AFAIU, __always_inline (resp. __attribute__((always_inline))) is the
> > same thing as inline if optimizations are enabled
> > (http://ohse.de/uwe/articles/gcc-attributes.html#func-always_inline).
> 
> And this doesn't tell the whole story because there is -fearly-inlining
> which enabled by default and it makes a difference when optimizations
> are enabled so __always_inline really enforces inlining.

and -fearly-inlining is another doc trap. I have tried with -O2
-fno-early-inlining and __always_inline code has been inlined with gcc
4.3 and 4.7 while simple inline is ignored so it really seems that
__always_inline is always inlined but man page is little a bit mean to
tell us all the details.

-- 
Michal Hocko
SUSE Labs
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