linux-kernel - Re: [PATCH 00/10] Containers(V10): Generic Process Containers

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Message-ID: <20070604205106.GA31530@sergelap.austin.ibm.com>
Date:	Mon, 4 Jun 2007 15:51:06 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Paul Menage <menage@...gle.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>, akpm@...ux-foundation.org,
	dev@...ru, xemul@...ru, vatsa@...ibm.com, ebiederm@...ssion.com,
	haveblue@...ibm.com, svaidy@...ux.vnet.ibm.com, balbir@...ibm.com,
	pj@....com, cpw@....com, ckrm-tech@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org,
	mbligh@...gle.com, rohitseth@...gle.com, devel@...nvz.org
Subject: Re: [PATCH 00/10] Containers(V10): Generic Process Containers

Quoting Paul Menage (menage@...gle.com):
> On 6/4/07, Serge E. Hallyn <serue@...ibm.com> wrote:
> >
> >2. I can't delete containers because of the files they contain, and
> >am not allowed to delete those files by hand.
> >
> 
> You should be able to delete a container with rmdir as long as it's
> not in use - its control files will get cleaned up automatically.
> 
> If you're getting an EBUSY error that means that either there are
> still tasks running in the container (look in the "tasks" file) or
> else there's a reference counting bug somewhere.
> 
> Can you post an example to reproduce the problem?

here is an excerpt:

[root@...uz11 root]# mount -t container -ocpuset cpuset /containers/
[root@...uz11 root]# ls /containers/
cpu_exclusive   memory_pressure          mems               tasks
cpus            memory_pressure_enabled  notify_on_release
mem_exclusive   memory_spread_page       releasable
memory_migrate  memory_spread_slab       release_agent
[root@...uz11 root]# mkdir /containers/1
[root@...uz11 root]# echo 0 > /containers/1/mems
[root@...uz11 root]# echo 0 > /containers/1/cpus
[root@...uz11 root]# sh
sh-2.05b# echo $$ > /containers/1/tasks
sh-2.05b# cat /containers/1/tasks 
4325
4326
sh-2.05b# exit
[root@...uz11 root]# ls /containers/1/tasks 
/containers/1/tasks
[root@...uz11 root]# rm -rf /containers/1 
rm: cannot remove `/containers/1/memory_spread_slab': Operation not
permitted
rm: cannot remove `/containers/1/memory_spread_page': Operation not
permitted
rm: cannot remove `/containers/1/memory_pressure': Operation not
permitted
rm: cannot remove `/containers/1/memory_migrate': Operation not
permitted
rm: cannot remove `/containers/1/mem_exclusive': Operation not permitted
rm: cannot remove `/containers/1/cpu_exclusive': Operation not permitted
rm: cannot remove `/containers/1/mems': Operation not permitted
rm: cannot remove `/containers/1/cpus': Operation not permitted
rm: cannot remove `/containers/1/releasable': Operation not permitted
rm: cannot remove `/containers/1/notify_on_release': Operation not
permitted
rm: cannot remove `/containers/1/tasks': Operation not permitted

Ah, I see the second time I typed 'ls /containers/1/tasks' instead of
cat.  When I then used cat, the file was empty, and I got an oops just
like Pavel reported.  I bet if I solve the problem he reported, then I
solve my problem  :)

thanks,
-serge
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