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SubjectRe: [RFC/RFT PATCH v3] sched: automated per tty task groups
On Wed, 2010-11-17 at 23:45 +0100, Lennart Poettering wrote:
> On Wed, 17.11.10 23:37, Peter Zijlstra ( wrote:
> >
> > On Wed, 2010-11-17 at 23:34 +0100, Lennart Poettering wrote:
> > >
> > > This should fix things for people with systemd and GNOME. Yes, all
> > > others are left in the cold. Sorry for that.
> >
> > Is there an easy opt out for that, other than booting a CONFIG_CGROUP=n
> > kernel?
> systemd relies on CONFIG_CGROUP=y, since it useses it for service
> management. It creates its own name=systemd hierarchy for that with no
> controllers attached. If you turn that off, then systemd will refuse to
> boot.

Do expect distro bugzilla entries when this 'awesome'-ness hits the

> However, it does not rely on any of the controllers, and hence you
> are welcome to disable all cgroup controlls and systemd won't complain.
> If you want to disable the automatic creation of groups in the 'cpu'
> hierarchy for user sessions then you can tell pam_systemd that by passing
> "controllers=" on the PAM config line. ("controllers=cpu" is the implied
> default.)
> There's currently no global option to disable the same logic in systemd
> when it creates 'cpu' cgroups for the various services it runs. However,
> you can disable that individually with "ControlGroups=cpu:/" in the
> .service files. I will now add a global option as well.

A global knob is a must -- preferably with neon signs on so I can find
it. Luckily I don't use this GNOME junk, otherwise I'd have had to ask
how to revert that crap as well.

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