linux-kernel - Re: [PATCH v3 08/16] slab: allow enable_cpu_cache to use preset values for its tunables

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Date:	Fri, 21 Sep 2012 12:29:20 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
	Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 08/16] slab: allow enable_cpu_cache to use preset
 values for its tunables

On Tue, Sep 18, 2012 at 5:12 PM, Glauber Costa <glommer@...allels.com> wrote:
> diff --git a/mm/slab.c b/mm/slab.c
> index e2cf984..f2d760c 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -4141,8 +4141,19 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
>  static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp)
>  {
>         int err;
> -       int limit, shared;
> -
> +       int limit = 0;
> +       int shared = 0;
> +       int batchcount = 0;
> +
> +#ifdef CONFIG_MEMCG_KMEM
> +       if (cachep->memcg_params.parent) {
> +               limit = cachep->memcg_params.parent->limit;
> +               shared = cachep->memcg_params.parent->shared;
> +               batchcount = cachep->memcg_params.parent->batchcount;

Style nit: please introduce a variable for
"cachep->memcg_params.parent" to make this human-readable.
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