From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755303AbbAGWpS (ORCPT ); Wed, 7 Jan 2015 17:45:18 -0500 Received: from mail-qc0-f170.google.com ([209.85.216.170]:48886 "EHLO mail-qc0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754587AbbAGWpP (ORCPT ); Wed, 7 Jan 2015 17:45:15 -0500 Date: Wed, 7 Jan 2015 17:45:11 -0500 From: Tejun Heo To: "Eric W. Biederman" Cc: "Serge E. Hallyn" , Richard Weinberger , Linux API , Linux Containers , Serge Hallyn , "linux-kernel@vger.kernel.org" , Andy Lutomirski , cgroups mailinglist , Ingo Molnar Subject: Re: [PATCHv3 8/8] cgroup: Add documentation for cgroup namespaces Message-ID: <20150107224430.GA28414@htj.dyndns.org> References: <54AB15BD.8020007@nod.at> <87lhlgpyxk.fsf@x220.int.ebiederm.org> <54AB2992.6060707@nod.at> <54ACFC38.5070007@nod.at> <87fvbmir9q.fsf@x220.int.ebiederm.org> <20150107193059.GA1857@mail.hallyn.com> <87bnma6xwv.fsf@x220.int.ebiederm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87bnma6xwv.fsf@x220.int.ebiederm.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 07, 2015 at 04:14:40PM -0600, Eric W. Biederman wrote: > I see what you mean. If it is indeed the case than a mount of cgroupfs > using the unified hiearchy and can not specify which controllers are > present under that mount that very significant bug and presents a very > significant regression in user space flexibility. The parent always controls which controllers are made available at the children level. Only if the parent enables a controller, its children, whether they're namespaces or not, can choose to further distribute resources using that controller. It's a straight-forward top-down thing. -- tejun