linux-kernel - Re: [PATCH 2/2] memcg: move memcg_update_cache_size to slab

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Message-ID: <20140922201137.GB5373@cmpxchg.org>
Date:	Mon, 22 Sep 2014 16:11:37 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michal Hocko <mhocko@...e.cz>, Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 2/2] memcg: move memcg_update_cache_size to slab_common.c

On Thu, Sep 18, 2014 at 07:50:20PM +0400, Vladimir Davydov wrote:
> The only reason why this function lives in memcontrol.c is that it
> depends on memcg_caches_array_size. However, we can pass the new array
> size immediately to it instead of new_id+1 so that it will be free of
> any memcontrol.c dependencies.
> 
> So let's move this function to slab_common.c and make it static.
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: Christoph Lameter <cl@...ux.com>

Looks good.  One nit below, but not a show stopper.

Acked-by: Johannes Weiner <hannes@...xchg.org>

> @@ -646,11 +646,13 @@ int memcg_limited_groups_array_size;
>  struct static_key memcg_kmem_enabled_key;
>  EXPORT_SYMBOL(memcg_kmem_enabled_key);
>  
> +static void memcg_free_cache_id(int id);

Any chance you could re-order this code to avoid the forward decl?
memcg_alloc_cache_id() and memcg_free_cache_id() are new functions
anyway, might as well put the definition above the callsites.

Thanks!
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