From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Goyal Subject: Re: [RFD] cgroup: about multiple hierarchies Date: Tue, 13 Mar 2012 09:49:22 -0400 Message-ID: <20120313134922.GB29169@redhat.com> References: <20120221211938.GE12236@google.com> <20120312221050.GG23255@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20120312221050.GG23255-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Tejun Heo Cc: Michal Schmidt , Frederic Weisbecker , containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Kay Sievers , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Lennart Poettering , cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Andrew Morton List-Id: containers.vger.kernel.org On Mon, Mar 12, 2012 at 03:10:50PM -0700, Tejun Heo wrote: > Hello, guys. > > Thanks a lot for the discussion and here are my take aways: > > * At least to me, nobody seems to have strong enough justification for > orthogonal multiple hierarchies, so, yeah, unless something else > happens, I'm scheduling multiple hierarchy support for the chopping > block. This is a long term thing (think years), so no need to panic > right now and as is life plans may change and fail to materialize, > but I intend to at least move away from it. So everything will be under single hierarchy? How will we control that what controllers are active on what cgroups? Or all controllers are going to be active on all cgroups on that hierarchy. That would be bad for IO cgroups where a better way to use it to isolate the trouble making workload and run rest in root or a common cgroup. Thanks Vivek From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754224Ab2CMNti (ORCPT ); Tue, 13 Mar 2012 09:49:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:61468 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753331Ab2CMNth (ORCPT ); Tue, 13 Mar 2012 09:49:37 -0400 Date: Tue, 13 Mar 2012 09:49:22 -0400 From: Vivek Goyal To: Tejun Heo Cc: Li Zefan , containers@lists.linux-foundation.org, cgroups@vger.kernel.org, Andrew Morton , Kay Sievers , Lennart Poettering , Frederic Weisbecker , linux-kernel@vger.kernel.org, Michal Schmidt , Peter Zijlstra Subject: Re: [RFD] cgroup: about multiple hierarchies Message-ID: <20120313134922.GB29169@redhat.com> References: <20120221211938.GE12236@google.com> <20120312221050.GG23255@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120312221050.GG23255@google.com> 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 On Mon, Mar 12, 2012 at 03:10:50PM -0700, Tejun Heo wrote: > Hello, guys. > > Thanks a lot for the discussion and here are my take aways: > > * At least to me, nobody seems to have strong enough justification for > orthogonal multiple hierarchies, so, yeah, unless something else > happens, I'm scheduling multiple hierarchy support for the chopping > block. This is a long term thing (think years), so no need to panic > right now and as is life plans may change and fail to materialize, > but I intend to at least move away from it. So everything will be under single hierarchy? How will we control that what controllers are active on what cgroups? Or all controllers are going to be active on all cgroups on that hierarchy. That would be bad for IO cgroups where a better way to use it to isolate the trouble making workload and run rest in root or a common cgroup. Thanks Vivek