On Thu, Sep 07, 2023 at 11:16:41AM -0400, Luiz Capitulino <luizcap@xxxxxxxxxx> wrote: > Yeah, this works for cgroup v2 but my understanding is that cgroup v1 > doesn't support changing flags in remount, take a look at > cgroup1_reconfigure(). Ah, didn't notice. Alhtough -- there seems to be a deeper issue -- the mount option doesn't have a per-root semantics. There is only a single cgroup_threadgroup_rwsem afterall. Even with your cmdline option, you may loose the behavior after unmounting any of the v1 hierarchies (cgroup_destroy_root() unconditionally disables it). Or you could still achieve the result by mounting cgroup2 hierarchy with favordynmods. (And unmount it, default root is not ever released.) Maybe it would be the best to have this controllable only via v2 hierarchy (as it's the only documented). (And maybe v1s should not show the option at all.) My 0.02€, Michal
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