Date: Mon, 25 Jun 2012 11:06:19 -0700
From: Tejun Heo <tj@kernel.org>
To: Glauber Costa <glommer@parallels.com>
Cc: cgroups@vger.kernel.org, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, Frederic Weisbecker <fweisbec@gmail.com>,
        David Rientjes <rientjes@google.com>,
        Pekka Enberg <penberg@kernel.org>, Michal Hocko <mhocko@suse.cz>,
        Johannes Weiner <hannes@cmpxchg.org>, Christoph Lameter <cl@linux.com>,
        devel@openvz.org, kamezawa.hiroyu@jp.fujitsu.com,
        Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH 06/11] memcg: kmem controller infrastructure
Message-ID: <20120625180619.GD3869@google.com>
References: <1340633728-12785-1-git-send-email-glommer@parallels.com>
 <1340633728-12785-7-git-send-email-glommer@parallels.com>
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Again, nits.

On Mon, Jun 25, 2012 at 06:15:23PM +0400, Glauber Costa wrote:
> +#define mem_cgroup_kmem_on 1
> +bool __mem_cgroup_new_kmem_page(gfp_t gfp, void *handle, int order);
> +void __mem_cgroup_commit_kmem_page(struct page *page, void *handle, int order);
> +void __mem_cgroup_free_kmem_page(struct page *page, int order);
> +#define is_kmem_tracked_alloc (gfp & __GFP_KMEMCG)

Ugh... please do the following instead.

static inline bool is_kmem_tracked_alloc(gfp_t gfp)
{
	return gfp & __GFP_KMEMCG;
}

>  #else
>  static inline void sock_update_memcg(struct sock *sk)
>  {
> @@ -416,6 +423,43 @@ static inline void sock_update_memcg(struct sock *sk)
>  static inline void sock_release_memcg(struct sock *sk)
>  {
>  }
> +
> +#define mem_cgroup_kmem_on 0
> +#define __mem_cgroup_new_kmem_page(a, b, c) false
> +#define __mem_cgroup_free_kmem_page(a,b )
> +#define __mem_cgroup_commit_kmem_page(a, b, c)
> +#define is_kmem_tracked_alloc (false)

I would prefer static inlines here too.  It's a bit more code in the
header but leads to less surprises (e.g. arg evals w/ side effects or
compiler warning about unused vars) and makes it easier to avoid
cosmetic errors.

Thanks.

-- 
tejun
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