cgroup, docs: Clarify limitation of RT processes with cgroup v2 cpu controller

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The limitation that all RT processes have to be in the root cgroup
before enabling cpu controller only applies if the CONFIG_RT_GROUP_SCHED
option is enabled in the running kernel. If a kernel does not have
CONFIG_RT_GROUP_SCHED enabled, RT processes can exist in a non-root
cgroup even when cpu controller is enabled. CPU sharing of RT processes
will not be under cgroup control, but other resources like memory can be.

Clarify this limitation to avoid confusion to users that are using
cgroup v2.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Waiman Long 2024-03-20 10:23:02 -04:00 • committed by Tejun Heo

parent 4cece76496

commit 20d46283f5

1 changed files with 9 additions and 6 deletions

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Documentation/admin-guide/cgroup-v2.rst

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