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SubjectRe: [PATCH] memcg: stop warning on memcg_propagate_kmem
On Mon 04-02-13 12:04:06, Glauber Costa wrote:
> On 02/04/2013 11:57 AM, Michal Hocko wrote:
> > On Sun 03-02-13 20:29:01, Hugh Dickins wrote:
> >> Whilst I run the risk of a flogging for disloyalty to the Lord of Sealand,
> >> I do have CONFIG_MEMCG=y CONFIG_MEMCG_KMEM not set, and grow tired of the
> >> "mm/memcontrol.c:4972:12: warning: `memcg_propagate_kmem' defined but not
> >> used [-Wunused-function]" seen in 3.8-rc: move the #ifdef outwards.
> >>
> >> Signed-off-by: Hugh Dickins <hughd@google.com>
> >
> > Acked-by: Michal Hocko <mhocko@suse.cz>
> >
> > Hmm, if you are not too tired then moving the function downwards to
> > where it is called (memcg_init_kmem) will reduce the number of ifdefs.
> > But this can wait for a bigger clean up which is getting due:
> > git grep "def.*CONFIG_MEMCG_KMEM" mm/memcontrol.c | wc -l
> > 12
> >
>
> The problem is that I was usually keeping things in clearly separated
> blocks, like this :
>
> #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET)
> struct tcp_memcontrol tcp_mem;
> #endif
> #if defined(CONFIG_MEMCG_KMEM)
> /* analogous to slab_common's slab_caches list. per-memcg */
> struct list_head memcg_slab_caches;
> /* Not a spinlock, we can take a lot of time walking the list */
> struct mutex slab_caches_mutex;
> /* Index in the kmem_cache->memcg_params->memcg_caches array */
> int kmemcg_id;
> #endif
>
> If it would be preferable to everybody, this could be easily rewritten as:
>
> #if defined(CONFIG_MEMCG_KMEM)
> #if defined(CONFIG_INET)
> struct tcp_memcontrol tcp_mem;
> #endif
> /* analogous to slab_common's slab_caches list. per-memcg */
> struct list_head memcg_slab_caches;
> /* Not a spinlock, we can take a lot of time walking the list */
> struct mutex slab_caches_mutex;
> /* Index in the kmem_cache->memcg_params->memcg_caches array */
> int kmemcg_id;
> #endif

I was rather interested in reducing CONFIG_KMEM block, the above example
doesn't bother me that much.

> This would allow us to collapse some blocks a bit down as well.
>
> It doesn't bother me *that* much, though.

Yes and a quick attempt shows that a clean up would bring a lot of
churn.
--
Michal Hocko
SUSE Labs


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