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cgroups.7: Define containment rules for cgroup.threads 

Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-01-10 23:19:50 +01:00
parent 446d164326
commit d84e558ef3
1 changed files with 23 additions and 2 deletions
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man7/cgroups.7
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@ -1328,9 +1328,30 @@ to the
files in different cgroups inside the subtree.
The threads of a process must all reside in the same threaded subtree.
.PP
The
As with writing to
.IR cgroup.procs ,
some containment rules apply when writing to the
.I cgroup.threads
file is writable only for the cgroups inside a threaded subtree.
file:
.IP * 3
The writer must have write permission on the
cgroup.threads
file in the destination cgroup.
.IP *
The writer must have write permission on the
.I cgroup.procs
file in the common ancestor of the source and destination cgroups.
(In some cases,
the common ancestor may be the source or destination cgroup itself.)
.IP *
The source and destination cgroups must be in the same threaded subtree.
(Outside a threaded subtree, an attempt to move a thread by writing
its thread ID to the
.I cgroup.threads
file in a different
.I domain
cgroup fails with the error
.BR EOPNOTSUPP .)
.PP
The
.I cgroup.threads