From 1619b6d4fdd776b1b91bd288ad6f7e37fe183485 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Tue, 16 Feb 2016 13:21:14 -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 Signed-off-by: Tejun Heo --- 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 9ae148a..3922ae1 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 cfb2c0f..0d962a1 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. -- 2.7.4