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cgroup: add warning about RT not being supported on cgroup2 

We haven't yet figured out what to do with RT threads on cgroup2.
Document the limitation.

v2: Included the warning about system management software behavior as
    suggested by Michael.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
This commit is contained in:
Tejun Heo 2017-12-05 09:10:17 -08:00
parent bdfbbda90a
commit c2f31b79d5
1 changed files with 7 additions and 0 deletions
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7
Documentation/cgroup-v2.txt
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@ -898,6 +898,13 @@ controller implements weight and absolute bandwidth limit models for
normal scheduling policy and absolute bandwidth allocation model for normal scheduling policy and absolute bandwidth allocation model for
realtime scheduling policy. realtime scheduling policy.
WARNING: cgroup2 doesn't yet support control of realtime processes and
the cpu controller can only be enabled when all RT processes are in
the root cgroup. Be aware that system management software may already
have placed RT processes into nonroot cgroups during the system boot
process, and these processes may need to be moved to the root cgroup
before the cpu controller can be enabled.
CPU Interface Files CPU Interface Files
~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~