[lxc-devel] [PATCH 1/5] cgroup: minor bugfixes so start and attach work again

[Michael H. Warfield]

On Mon, 2013-08-19 at 16:57 -0500, Serge Hallyn wrote: 
> Quoting Christian Seiler (christian at iwakd.de):
> > Hi Serge,
> > 
> > > Thanks, Christian - I've pushed a new patch to github on top of yours.
> > > Regular start/stop/lxc-cgroup stuff is working for me both with all
> > > cgroups composed and separately mounted.
> > 
> > I can confirm that it works on my setup.
> > 
> > I do have a very stupid question, however: LXC 0.9 used to set the
> > cgroup to /lxc/$name. Now it's just /$name. Is that intentional?

> Hm, it was somewhat unconscious but I didn't really mean to do that.
> Some cgroup subsystems do incur a performance penalty for every
> extra directory we descend.  But /lxc does make for a nice grouping.

> Do you (and others) have a preference?  Should we stick with /lxc?

I would.

In the early days, before we had systemd or libvirt or whatever defining
the cgroups mount, I thought it was not there but then we had it.  But
there were other competing clients, such as libvirt.  I thought the /lxc
directory had been implemented to avoid possible collisions and I
thought, and still think, that's a good thing.

I'm surprised there are penalties for descending directories in there.
Is it significant?

Is this something which will be impacted by the cgroups rework that's
been in the press?

> -serge

Regards,
Mike

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Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
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