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cgroups.7: One may need to unmount v1 controllers before they can be used in v2 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-12-23 10:58:08 +01:00
parent 75a12bb537
commit 57cbb0dbb0
1 changed files with 18 additions and 0 deletions
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man7/cgroups.7
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@ -554,6 +554,24 @@ A cgroup v2 controller is available only if it is not currently in use
via a mount against a cgroup v1 hierarchy.
Or, to put things another way, it is not possible to employ
the same controller against both a v1 hierarchy and the unified v2 hierarchy.
This means that it may be necessary first to unmount a v1 controller
(as described above) before that controller is available in v2.
Since
.BR systemd (1)
makes heavy use of some v1 controllers by default,
it can in some cases be simpler to boot the system with
selected v1 controllers disabled.
To do this, specify the
.IR cgroup_no_v1=list
option on the kernel boot command line;
.I list
is a comma-separated list of the names of the controllers to disable,
or the word
.I all
to disable all v1 controllers.
(This situation is correctly handled by
.BR systemd (1),
which falls back to operating without the specified controllers.)
.PP
Note that on many modern systems,
.BR systemd (1)