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 <hannes@xxxxxxxxxxx>
> > 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 <hannes@xxxxxxxxxxx>
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 <hannes@xxxxxxxxxxx>
---
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: <string>
nosocket -- Disable socket memory accounting.
--
2.7.1
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