Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

[Peter Zijlstra]

On Wed, 2010-11-17 at 23:45 +0100, Lennart Poettering wrote:
> On Wed, 17.11.10 23:37, Peter Zijlstra (a.p.zijlstra@xxxxxxxxx) 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
street.

>  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.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/