Luca Boccassi
60686a33c3
Since a1f4fd3876 udev processes
run in an 'udev' subcgroup, to avoid killing control processes
when clearing workers. But the main process is still in the same
cgroup, so the atomic cgroup.kill cannot be used.
If the main subcgroup exists, try to create a sibling 'workers'
cgroup, and use it for workers processes, and use cgroup.kill if
available.
This is especially useful as rules can spawn arbitrary programs/scripts
and TasksMax= is set to unlimited.
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