From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx163.postini.com [74.125.245.163]) by kanga.kvack.org (Postfix) with SMTP id 4612F6B005A for ; Wed, 5 Sep 2012 16:12:44 -0400 (EDT) Received: by dadi14 with SMTP id i14so649840dad.14 for ; Wed, 05 Sep 2012 13:12:43 -0700 (PDT) Date: Wed, 5 Sep 2012 13:12:38 -0700 From: Tejun Heo Subject: Re: [PATCH v2] memcg: first step towards hierarchical controller Message-ID: <20120905201238.GE13737@google.com> References: <5045BD25.10301@parallels.com> <20120904130905.GA15683@dhcp22.suse.cz> <504601B8.2050907@parallels.com> <20120904143552.GB15683@dhcp22.suse.cz> <50461241.5010300@parallels.com> <20120904145414.GC15683@dhcp22.suse.cz> <50461610.30305@parallels.com> <20120904162501.GE15683@dhcp22.suse.cz> <504709D4.2010800@parallels.com> <20120905144942.GH5388@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120905144942.GH5388@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: Glauber Costa , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Dave Jones , Ben Hutchings , Peter Zijlstra , Paul Turner , Lennart Poettering , Kay Sievers , Kamezawa Hiroyuki , Johannes Weiner Hello, Michal. On Wed, Sep 05, 2012 at 04:49:42PM +0200, Michal Hocko wrote: > Can we settle on the following 3 steps? > 1) warn about "flat" hierarchies (give it X releases) - I will push it > to as many Suse code streams as possible (hope other distributions > could do the same) I think I'm just gonna trigger WARN from cgroup core if anyone tries to create hierarchy with a controller which doesn't support full hierarchy. WARN_ON_ONCE() at first and then WARN_ON() on each creation later on. > 2) flip the default on the root cgroup & warn when somebody tries to > change it to 0 (give it another X releases) that the knob will be > removed > 3) remove the knob and the whole nonsese > 4) revert 3 if somebody really objects If we can get to 3, I don't think 4 would be a problem. Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org