How to verify if cgroup tree is writable?

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I'm trying to follow this documentation and I'm struggling to understand how can I make the cgroup tree writable or how I can verify it.

In that documentation, I have a link towards how can I allow delegation of other controllers in cgroup, which I did. I didn't find a way to specify the Delegate=yes property. In delegate.conf I can specify something like this Delegate=cpu cpuset io memory pids.


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