linux-kernel - Re: [PATCH 2/4] mm/memcontrol.c: use accessor to get id from css

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Date:	Tue, 22 Apr 2014 15:03:31 +0800
From:	Jianyu Zhan <nasa4836@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	kamezawa.hiroyu@...fujitsu.com
Cc:	Cgroups <cgroups@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jianyu Zhan <nasa4836@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/4] mm/memcontrol.c: use accessor to get id from css

Cc Andrew.

Thanks,
Jianyu Zhan


On Tue, Apr 22, 2014 at 2:30 PM, Jianyu Zhan <nasa4836@...il.com> wrote:
> This is a prepared patch for converting from per-cgroup id to
> per-subsystem id.
>
> We should not access per-cgroup id directly, since this is implemetation
> detail. Use the accessor css_from_id() instead.
>
> This patch has no functional change.
>
> Signed-off-by: Jianyu Zhan <nasa4836@...il.com>
> ---
>  mm/memcontrol.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 80d9e38..46333cb 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -528,10 +528,10 @@ static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
>  static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
>  {
>         /*
> -        * The ID of the root cgroup is 0, but memcg treat 0 as an
> -        * invalid ID, so we return (cgroup_id + 1).
> +        * The ID of css for the root cgroup is 0, but memcg treat 0 as an
> +        * invalid ID, so we return (id + 1).
>          */
> -       return memcg->css.cgroup->id + 1;
> +       return css_to_id(&memcg->css) + 1;
>  }
>
>  static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
> @@ -6407,7 +6407,7 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
>         struct mem_cgroup *memcg = mem_cgroup_from_css(css);
>         struct mem_cgroup *parent = mem_cgroup_from_css(css_parent(css));
>
> -       if (css->cgroup->id > MEM_CGROUP_ID_MAX)
> +       if (css_to_id(css) > MEM_CGROUP_ID_MAX)
>                 return -ENOSPC;
>
>         if (!parent)
> --
> 2.0.0-rc0
>
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