linux-kernel - Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for direct descendants

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Date:	Thu, 21 Jul 2016 11:04:01 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Aleksa Sarai <asarai@...e.de>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>,
	Aditya Kali <adityakali@...gle.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Christian Brauner <cbrauner@...e.de>, dev@...ncontainers.org
Subject: Re: [PATCH v1 3/3] cgroup: relax common ancestor restriction for
 direct descendants

Hello, Aleksa.

On Fri, Jul 22, 2016 at 01:07:13AM +1000, Aleksa Sarai wrote:
> > Coordinate in userspace.  Request whatever is managing the cgroup
> > hierarchy to set up delegation.  It's not like permission model is
> > fully contained in kernel on modern systems anyway.
> 
> My experience with certain systemdaemons' cgroup handling doesn't inspire
> confidence :/ (from the runC side, we've had nothing but issues). Also, how

Fix it then.  Working around bugs in userland isn't a justifiable
rationale for adding new kernel features.

> do you even boot into a cgroupv2 system with systemd (I started backporting
> patches to openSUSE, but it's still not booting)?

With devel branch, just passing in the unified hierarchy boot param
seems to work fine here.

Thanks.

-- 
tejun