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cgroups.7: Document the cgroup.max.depth and cgroup.max.descendants files 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2017-12-27 20:28:39 +01:00
parent 5e071499bb
commit 5845e10bdb
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@ -797,6 +797,42 @@ before being destroyed.
A process can't be made a member of a dying cgroup,
and a dying cgroup can't be brought back to life.
.\"
.SS Limiting the number of descendant cgroups
Each cgroup in the v2 hierarchy contains the following files,
which can be used to view and set limits on the number
of descendant cgroups under that cgroup:
.TP
.IR cgroup.max.depth " (since Linux 4.14)"
.\" commit 1a926e0bbab83bae8207d05a533173425e0496d1
This file defines a limit on the depth of nesting of descendant cgroups.
A value of 0 in this file means that no descendant cgroups can be created.
An attempt to create a descendant whose nesting level exceeds
the limit fails
.RI ( mkdir (2)
fails with the error
.BR EAGAIN ).
.IP
Writing the string
.IR """max"""
to this file means that no limit is imposed.
The default value in this file is
.IR """max""" .
.TP
.IR cgroup.max.descendants " (since Linux 4.14)"
.\" commit 1a926e0bbab83bae8207d05a533173425e0496d1
This file defines a limit on the number of live descendant cgroups that
this cgroup may have.
An attempt to create more descendants than allowed by the limit fails
.RI ( mkdir (2)
fails with the error
.BR EAGAIN ).
.IP
Writing the string
.IR """max"""
to this file means that no limit is imposed.
The default value in this file is
.IR """max""" .
.\"
.SS Cgroups v2 delegation
In the context of cgroups,
delegation means passing management of some subtree