linux-kernel - Re: [PATCH 7/8] memcg: get rid of mm

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Message-ID: <20150714153229.GH17660@dhcp22.suse.cz>
Date:	Tue, 14 Jul 2015 17:32:29 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] memcg: get rid of mm_struct::owner

On Sat 11-07-15 10:09:06, Vladimir Davydov wrote:
[...]
> Why can't we make root_mem_cgroup statically allocated? AFAICS it's a
> common practice - e.g. see blkcg_root, root_task_group.

It's not that easy. mem_cgroup doesn't have a fixed size. It depends
on the number of online nodes. I haven't looked closer to this yet but
cgroup has an early init code path maybe we can hook in there.

I would like to settle with the current issues described in other email
first, though. This is just a cosmetic issue.
-- 
Michal Hocko
SUSE Labs
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