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

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Message-ID: <20120719102818.GA20171@kernel>
Date:	Thu, 19 Jul 2012 18:28:18 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>
Cc:	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

On Thu, Jul 19, 2012 at 07:23:07PM +0900, Kamezawa Hiroyuki wrote:
>(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.

Hmm, I see, thank you. :-)

Best Regards,
Wanpeng Li
>
>-Kame

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