Re: [PATCH v2] sched: RT bandwidth interface for cgroup unified hierarchy

[Michal Koutný]

Hello Chengming.

On Wed, Jun 22, 2022 at 09:55:57AM +0800, Chengming Zhou <zhouchengming@xxxxxxxxxxxxx> wrote:
> We need to run RT threads in cgroup unified hierarchy, but we can't
> since the default rt_bandwidth.rt_runtime of non-root task_group is 0
> and we haven't interface to update it.

Do you really want to make use of group RT schedulling
(CONFIG_RT_GROUP_SCHED) or just be able to run RT threads in the unified
hieararchy with cpu controller enabled?

Those are two different use cases, the former is more complex and it's a
reason why v2 doesn't expose the RT attributes (yet).
The latter is typically achieved by unsetting CONFIG_RT_GROUP_SCHED (and
relying on the global rt_runtime limit).

Thanks,
Michal