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cgroup: move PID 1 out of the init/ group

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A cgroup holding processes cannot enable controllers for its children,
so init/ had to stay a leaf.  The hotplug helpers 10-hotplug.conf.in
places there ended up in groups where cpu.weight and friends could
never be set.

Keeping PID 1 in the root cgroup makes init/ a domain like the others.
It also unbreaks lxc-based runtimes: liblxc bases the container tree on
PID 1's cgroup and only special-cases systemd's init.scope/, so under
Finit it landed containers in init/, with no controllers available.

Issue #497

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2026-08-12 07:18:40 +02:00
parent a35ed8f72e
commit 1843c24cda
2 changed files with 8 additions and 19 deletions
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doc/config/cgroups.md
+3 -1
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@@ -42,7 +42,9 @@ the above three. We leave `init/` and `user/` as-is reducing weight of
cgroup maint { cpu.weight = 100 }
By default, the `system/` cgroup is selected for almost everything. The
`init/` cgroup is reserved for PID 1 itself and its closest relatives.
`init/` cgroup is reserved for the early boot helpers Finit drives
itself, like udev and mdev. PID 1 runs in the root cgroup, since a
cgroup holding processes cannot delegate controllers to its children.
The `user/` cgroup is for local TTY logins spawned by getty.
Joining a Cgroup