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Commit c2f31b79 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Reported-by: default avatar"Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
parent bdfbbda9

Documentation/cgroup-v2.txt

+7 −0
Original line number Diff line number Diff line
@@ -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

~~~~~~~~~~~~~~~~~~~