linux-kernel - Re: [PATCH v2] mm/memcg: use exist interface to get css from memcg

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Message-ID: <5007E00B.6000802@jp.fujitsu.com>
Date:	Thu, 19 Jul 2012 19:23:07 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	Bob Liu <lliubbo@...il.com>
Subject: Re: [PATCH v2] mm/memcg: use exist interface to get css from memcg

(2012/07/19 18:29), Michal Hocko wrote:
> On Wed 18-07-12 19:08:54, Wanpeng Li wrote:
>> use exist interface mem_cgroup_css instead of &mem->css.
>
> This interface has been added to enable mem->css outside of
> mm/memcontrol.c (where we define struct mem_cgroup). There is one user
> left (hwpoison_filter_task) after recent clean ups.
>
> I think we shouldn't spread the usage inside the mm/memcontrol.c. The
> compiler inlines the function for all callers added by this patch but I
> wouldn't rely on it. It is also unfortunate that we cannot convert all
> dereferences (e.g. const mem_cgroup).
> Moreover it doesn't add any additional type safety. So I would vote for
> not taking the patch but if others like it I will not block it.
>

Agreed.

-Kame

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