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| author | Tejun Heo <tj@kernel.org> | 2017-12-05 20:10:17 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-12-05 22:47:17 +0300 |
| commit | c2f31b79d510ec1a27138bdcf2d0ece1080be85e (patch) | |
| tree | 96101d852e918b16cda3973da65de900e1943b5b | |
| parent | bdfbbda90aeb75ce0951413fd7f495d4d377bd5e (diff) | |
| download | linux-c2f31b79d510ec1a27138bdcf2d0ece1080be85e.tar.xz | |
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>
| -rw-r--r-- | Documentation/cgroup-v2.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt index 779211fbb69f..2cddab7efb20 100644 --- a/Documentation/cgroup-v2.txt +++ b/Documentation/cgroup-v2.txt @@ -898,6 +898,13 @@ controller implements weight and absolute bandwidth limit models for normal scheduling policy and absolute bandwidth allocation model for 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 ~~~~~~~~~~~~~~~~~~~ |