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Date: Tue, 14 Jul 2015 17:32:29 +0200
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH 7/8] memcg: get rid of mm_struct::owner
Message-ID: <20150714153229.GH17660@dhcp22.suse.cz>
References: <1436358472-29137-1-git-send-email-mhocko@kernel.org>
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To: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>, Andrew Morton <akpm@linux-foundation.org>, Tejun Heo <tj@kernel.org>, Oleg Nesterov <oleg@redhat.com>, Greg Thelen <gthelen@google.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>

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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