Re: [RFC PATCH bpf-next 0/8] bpf, cgroup: Add bpf support for cgroup controller

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Hello,

On Tue, Sep 26, 2023 at 11:01:08AM +0800, Yafang Shao wrote:
> Thanks for your suggestion. I will think about it.
> BTW, I can't find the hierarchy ID of systemd (/sys/fs/cgroup/systemd)
> in /proc/cgroups. Is this intentional as part of the design, or might
> it be possible that we overlooked it?
> In the userspace, where can we find the hierarchy ID of a named hierarchy?

Yeah, /proc/cgroups only prints the hierarchies which have controllers
attached to them. The file is pretty sad in general. However,
/proc/PID/cgroup prints all existing hierarchies along with their IDs and
identifiers (controllers or names). Hopefully, that should be enough?

Thanks.

-- 
tejun



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