linux-kernel - Re: [PATCH 0/2] resource control file system

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Message-ID: <6599ad830703070929r1fa9629cjef1570b461e2b77@mail.gmail.com>
Date:	Wed, 7 Mar 2007 09:29:12 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	vatsa@...ibm.com
Cc:	ebiederm@...ssion.com, sam@...ain.net, akpm@...ux-foundation.org,
	pj@....com, dev@...ru, xemul@...ru, serue@...ibm.com,
	containers@...ts.osdl.org, winget@...gle.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] resource control file system - aka containers on top of nsproxy!

On 3/7/07, Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:
>
> > - when you do sys_unshare() or a clone that creates new namespaces,
> > then the task (or its child) will get a new nsproxy that has the rcfs
> > subsystem state associated with the old nsproxy, and one or more
> > namespace pointers cloned to point to new namespaces. So this means
> > that the nsproxy for the task is no longer the nsproxy associated with
> > any directory in rcfs. (So the task will disappear from any "tasks"
> > file in rcfs?)
>
> it "should" disappear yes, although I haven't carefully studied the
> unshare requirements yet.

That seems bad. With the current way you're doing it, if I mount
hierarchies A and B on /mnt/A and /mnt/B, then initially all tasks are
in /mnt/A/tasks and /mnt/B/tasks. If I then create /mnt/A/foo and move
a process into it, that process disappears from /mnt/B/tasks, since
its nsproxy no longer matches the nsproxy of B's root container. Or am
I missing something?

Paul
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