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

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Message-ID: <20160721155046.GB23759@htj.duckdns.org>
Date:	Thu, 21 Jul 2016 11:50:46 -0400
From:	Tejun Heo <tj@...nel.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Aleksa Sarai <asarai@...e.de>,
	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, James.

On Thu, Jul 21, 2016 at 08:34:36AM -0700, James Bottomley wrote:
> So if I as the cgroup ns owner am moving a task from A to A_subdir, the
> admin scanning tasks in all of A may miss this task in motion because
> all the tasks files can't be scanned atomically?

So, the admin just wants to move processes from A and only A to B.  It
doesn't wanna interfere with processes in the subdirs or on-going ns
operations, but if the race occurs, both A -> B migration and ns
subdir operation would succeed and the end result would be something
neither expects.

Thanks.

-- 
tejun