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cgroups.7: Add a section on unmounting cgroup v1 filesystems 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2017-12-23 10:27:11 +01:00
parent 783a40b677
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@ -231,6 +231,28 @@ in particular,
.BR systemd (1)
automatically creates such mount points.
.\"
.SS Unmounting v1 controllers
A mounted cgroup filesystem can be unmounted using the
.BR umount (8)
command, as in the following example:
.PP
.in +4n
.EX
umount /sys/fs/cgroup/pids
.EE
.in
.PP
.IR "But note well" :
a cgroup filesystem is unmounted only if it is not busy,
that is, it has no child cgroups.
If this is not the case, then the only effect of the
.BR umount (8)
is to make the mount invisible.
Thus, to ensure that the mount point is really removed,
one must first remove all child cgroups,
which in turn can be done only after all member processes
have been moved from those cgroups to the root cgroup.
.\"
.SS Cgroups version 1 controllers
Each of the cgroups version 1 controllers is governed
by a kernel configuration option (listed below).