Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752462AbbKPUy4 (ORCPT ); Mon, 16 Nov 2015 15:54:56 -0500 Received: from h2.hallyn.com ([78.46.35.8]:46752 "EHLO h2.hallyn.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751204AbbKPUyy (ORCPT ); Mon, 16 Nov 2015 15:54:54 -0500 Date: Mon, 16 Nov 2015 14:54:52 -0600 From: "Serge E. Hallyn" To: Richard Weinberger Cc: "Serge E. Hallyn" , Richard Weinberger , LKML , "open list:ABI/API" , Linux Containers , "Eric W. Biederman" , LXC development mailing-list , Tejun Heo , cgroups mailinglist , Andrew Morton Subject: Re: CGroup Namespaces (v4) Message-ID: <20151116205452.GA30975@mail.hallyn.com> References: <1447703505-29672-1-git-send-email-serge@hallyn.com> <20151116204606.GA30681@mail.hallyn.com> <564A41AF.4040208@nod.at> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <564A41AF.4040208@nod.at> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2074 Lines: 55 On Mon, Nov 16, 2015 at 09:50:55PM +0100, Richard Weinberger wrote: > Am 16.11.2015 um 21:46 schrieb Serge E. Hallyn: > > On Mon, Nov 16, 2015 at 09:41:15PM +0100, Richard Weinberger wrote: > >> Serge, > >> > >> On Mon, Nov 16, 2015 at 8:51 PM, wrote: > >>> To summarize the semantics: > >>> > >>> 1. CLONE_NEWCGROUP re-uses 0x02000000, which was previously CLONE_STOPPED > >>> > >>> 2. unsharing a cgroup namespace makes all your current cgroups your new > >>> cgroup root. > >>> > >>> 3. /proc/pid/cgroup always shows cgroup paths relative to the reader's > >>> cgroup namespce root. A task outside of your cgroup looks like > >>> > >>> 8:memory:/../../.. > >>> > >>> 4. when a task mounts a cgroupfs, the cgroup which shows up as root depends > >>> on the mounting task's cgroup namespace. > >>> > >>> 5. setns to a cgroup namespace switches your cgroup namespace but not > >>> your cgroups. > >>> > >>> With this, using github.com/hallyn/lxc #2015-11-09/cgns (and > >>> github.com/hallyn/lxcfs #2015-11-10/cgns) we can start a container in a full > >>> proper cgroup namespace, avoiding either cgmanager or lxcfs cgroup bind mounts. > >>> > >>> This is completely backward compatible and will be completely invisible > >>> to any existing cgroup users (except for those running inside a cgroup > >>> namespace and looking at /proc/pid/cgroup of tasks outside their > >>> namespace.) > >>> cgroupns-root. > >> > >> IIRC one downside of this series was that only the new "sane" cgroup > >> layout was supported > >> and hence it was useless for everything which expected the default layout. > >> Hence, still no systemd for us. :) > >> > >> Is this now different? > > > > Yes, all hierachies are no supported. > > > > Should read "now"? :-) > If so, *awesome*! D'oh! Yes, now :-) -serge -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/