From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755843AbcBPSWP (ORCPT ); Tue, 16 Feb 2016 13:22:15 -0500 Received: from gum.cmpxchg.org ([85.214.110.215]:58516 "EHLO gum.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755627AbcBPSWN (ORCPT ); Tue, 16 Feb 2016 13:22:13 -0500 Date: Tue, 16 Feb 2016 13:21:14 -0500 From: Johannes Weiner To: Tejun Heo Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com Subject: Re: [PATCH] cgroup: provide cgroup_nov1= to disable controllers in v1 mounts Message-ID: <20160216182114.GA30548@cmpxchg.org> References: <1455145195-7553-1-git-send-email-hannes@cmpxchg.org> <20160211151707.GY3741@mtj.duckdns.org> <20160211183449.GA399@cmpxchg.org> <20160212200334.GA3965@htj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160212200334.GA3965@htj.duckdns.org> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 12, 2016 at 03:03:34PM -0500, Tejun Heo wrote: > On Thu, Feb 11, 2016 at 01:34:49PM -0500, Johannes Weiner wrote: > > From 89e581ca54bdca37d6c464334d2217d14a229540 Mon Sep 17 00:00:00 2001 > > From: Johannes Weiner > > Date: Wed, 10 Feb 2016 17:29:31 -0500 > > Subject: [PATCH] cgroup: provide cgroup_no_v1= to disable controllers in v1 > > mounts > > Applied to cgroup/for-4.6. Can you please send another patch to > update Documentation/kernel-parameters.txt and cgroup.txt for the new > knob? How about this? >>From 95ae2ca2211e0db4db63d2dd1b187e299d9490fb Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Tue, 16 Feb 2016 13:19:11 -0500 Subject: [PATCH] cgroup: document cgroup_no_v1= Add cgroup_no_v1= to kernel-parameters.txt, and a small blurb to cgroup-v2.txt section about transitioning from cgroup to cgroup2. Signed-off-by: Johannes Weiner --- Documentation/cgroup-v2.txt | 6 ++++++ Documentation/kernel-parameters.txt | 5 +++++ 2 files changed, 11 insertions(+) diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt index e2f4e7948a66..e892c7ab39ef 100644 --- a/Documentation/cgroup-v2.txt +++ b/Documentation/cgroup-v2.txt @@ -132,6 +132,12 @@ strongly discouraged for production use. It is recommended to decide the hierarchies and controller associations before starting using the controllers after system boot. +During transition to v2, system management software might still +automount the v1 cgroup filesystem and so hijack all controllers +during boot, before manual intervention is possible. To make testing +and experimenting easier, the kernel parameter cgroup_no_v1= allows +disabling controllers in v1 and make them always available in v2. + 2-2. Organizing Processes diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 444bff30e1cf..150173f47115 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -608,6 +608,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. cut the overhead, others just disable the usage. So only cgroup_disable=memory is actually worthy} + cgroup_no_v1= [KNL] Disable one, multiple, all cgroup controllers in v1 + Format: { controller[,controller...] | "all" } + Like cgroup_disable, but only applies to cgroup v1; + the blacklisted controllers remain available in cgroup2. + cgroup.memory= [KNL] Pass options to the cgroup memory controller. Format: nosocket -- Disable socket memory accounting. -- 2.7.1