[proposal] delegating cgroup manager to non-PID1

[Luke Kenneth Casson Leighton]

(i am subscribed nomail to lkml, please cc thx)

in recent discussions about PID-1 alternatives (sysvinit, openrc,
systemd, depinit) i was alerted to the idea that PID1 is to become the
sole exlcusive process permitted to manage cgroups.  given that, just
as one specific example, depinit is only around 2,300 lines of c code,
adding extra code to manage cgroups is of some concern especially in
light of the general UNIX philosophy "do one thing and do it well".

to allow the general UNIX philosophy to be honoured, may i
respectfully propose an additional linux kernel systemcall which
permits delegation - solely and exclusively by PID1 - of the
management of cgroups to one (and only one) other process, and that
furthermore that the process must be an immediate child of PID1?

l.
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