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cgroups.7: Document cgroups v2 cgroup.stat file 

Based on the text in Documentation/cgroup-v2.txt.

Reviewed-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2017-12-27 19:20:55 +01:00
parent f7286edcde
commit 5e071499bb
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@ -774,6 +774,29 @@ of a process for each notification.
Second, notification can be delegated to a process that lives inside
a container associated with the newly empty cgroup.
.\"
.SS Cgroups v2 cgroup.stat file
.\" commit ec39225cca42c05ac36853d11d28f877fde5c42e
Each cgroup in the v2 hierarchy contains a read-only
.IR cgroup.stat
file (first introduced in Linux 4.14)
that consists of lines containing key-value pairs.
The following keys currently appear in this file:
.TP
.I nr_descendants
This is the total number of visible (i.e., living) descendant cgroups
underneath this cgroup.
.TP
.I nr_dying_descendants
This is the total number of dying descendant cgroups
underneath this cgroup.
A cgroup enters the dying state after being deleted.
It remains in that state for an undefined period
(which will depend on system load)
before being destroyed.
.IP
A process can't be made a member of a dying cgroup,
and a dying cgroup can't be brought back to life.
.\"
.SS Cgroups v2 delegation
In the context of cgroups,
delegation means passing management of some subtree