Date: Mon, 16 Jun 2014 10:12:33 -0400
From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>, Greg Thelen <gthelen@google.com>,
        Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Michel Lespinasse <walken@google.com>,
        Roman Gushchin <klamm@yandex-team.ru>, linux-mm@kvack.org,
        LKML <linux-kernel@vger.kernel.org>, Li Zefan <lizefan@huawei.com>
Subject: Re: [PATCH 2/2] memcg: Allow guarantee reclaim
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References: <1402473624-13827-1-git-send-email-mhocko@suse.cz>
 <1402473624-13827-2-git-send-email-mhocko@suse.cz>
 <20140611153631.GH2878@cmpxchg.org>
 <20140612132207.GA32720@dhcp22.suse.cz>
 <20140612135600.GI2878@cmpxchg.org>
 <20140612142237.GB32720@dhcp22.suse.cz>
 <20140612161733.GC23606@htj.dyndns.org>
 <20140616125915.GB16915@dhcp22.suse.cz>
 <20140616135741.GA11542@htj.dyndns.org>
 <20140616140448.GE16915@dhcp22.suse.cz>
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On Mon, Jun 16, 2014 at 04:04:48PM +0200, Michal Hocko wrote:
> > For whatever reason, a user is stuck with thread-level granularity for
> > controllers which work that way, the user can use the old hierarchies
> > for them for the time being.
> 
> So he can mount memcg with new cgroup API and others with old?

Yes, you can read Documentation/cgroups/unified-hierarchy.txt for more
details.  I think I cc'd you when posting unified hierarchy patchset,
didn't I?

> > Nope, some changes don't fit that model.  CFTYPE_ON_ON_DFL is the
> > opposite. 
> 
> OK, I wasn't aware of this. On which branch I find this?

They're all in the mainline now.

> > Knobs marked with the flag only appear on the default
> > hierarchy (cgroup core internally calls it the default hierarchy as
> > this is the tree all the controllers are attached to by default).
> 
> I am not sure I understand. So they are visible only in the hierarchy
> mounted with the new cgroup API (sane or how is it called)?

Yeap.

Thanks.

-- 
tejun
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