[Devel] Re: [Testing CGROUP inside CONTAINER]: BUG#1

[Rishikesh K. Rajak]

On Thu, 2008-12-04 at 18:55 +0530, gowrishankar wrote:

> Hi Rishi,
> Rishikesh K. Rajak wrote:
> > Hi All,
> >
> > Recently i have started using tool (lxc-0.4.1.tar.gz) for container
> > creation released by Daniel. I am not sure if inside container, cgroup
> > support is there or not. If it is not supported till now then here is
> >   
> > the point where we can start to look into it.
> >
> > Steps executed:
> >
> >     - create a container : lxc-create -f /etc/lxc-no-netns.conf -n xray
> >         rishi :~ # cat /etc/lxc-no-netns.conf
> >             # Container with non-virtualized network
> >              lxc.utsname = delta
> >     -  Execute container
> >         :~ # lxc-execute -n xray /bin/bash
> >         delta:~ #
> >     -  Execute the following command inside container
> >      delta:~ # mkdir /cpu
> >      delta:~ # mount -t cgroup -ocpu cgroup /cpu
> >
> >     -   delta:~ # cat /cpu/tasks
> >
> >     - You can see many zero's has attached with task file inside
> > container. 
> >
> >   
> It is expected behaviour of container, as PIDs in other namespaces will 
> always be shown as 0.
> So here, these 0s are from system ns (probably, as you had only system 
> ns and delta ns).
> I have been trying to fix for "for_each_process" macro related stuff wrt 
> container code, yet I ll check out
> if I am right, as I am also curious now.
> > As i can understand cgroup has been mounted inside container so it
> > should attach the task which is running inside container. Please correct
> >   
> Yes. and it is doing already. Only problem is unwanted 0s. Loot at the 


Hi Gowri,

Yes, the problem is right here i think. Many 0s should not appear, as
inside container only container process should be read.
Not the root's processes.

-Rishi


> bottom of list you get
> while cat. you see numbers other than 0,which are container processes.
> > me if i am wrong here.
> >
> > Additional info:
> >
> > rishi:~ # cat /boot/config-2.6.27.7-4-pae | grep CGROUP
> > CONFIG_CGROUPS=y
> > # CONFIG_CGROUP_DEBUG is not set
> > CONFIG_CGROUP_NS=y
> > CONFIG_CGROUP_DEVICE=y
> > CONFIG_CGROUP_FREEZER=y
> > CONFIG_CGROUP_SCHED=y
> > CONFIG_CGROUP_CPUACCT=y
> > CONFIG_CGROUP_MEM_RES_CTLR=y
> > rishi:~ # cat /boot/config-2.6.27.7-4-pae | grep _NS
> > CONFIG_CGROUP_NS=y
> > CONFIG_UTS_NS=y
> > CONFIG_IPC_NS=y
> > CONFIG_USER_NS=y
> > CONFIG_PID_NS=y
> > CONFIG_NF_CONNTRACK_NETBIOS_NS=m
> > CONFIG_NSC_FIR=m
> > CONFIG_BLK_DEV_NS87415=m
> > CONFIG_SCSI_NSP32=m
> > CONFIG_PATA_NS87410=m
> > CONFIG_PATA_NS87415=m
> > CONFIG_NS83820=m
> > CONFIG_GAMEPORT_NS558=m
> > CONFIG_NSC_GPIO=m
> > CONFIG_TCG_NSC=m
> > CONFIG_NCPFS_NFS_NS=y
> > CONFIG_NCPFS_OS2_NS=y
> > rishi:~ # uname -a
> > Linux rishi 2.6.27.7-4-pae #1 SMP 2008-11-25 00:02:37 +0100 i686 i686
> > i386 GNU/Linux
> > rishi:~ #
> >
> >
> > - Rishi
> > _______________________________________________
> > Containers mailing list
> > Containers at lists.linux-foundation.org
> > https://lists.linux-foundation.org/mailman/listinfo/containers
> >
> >   
> Thanks for reporting.
> --
> Gowrishankar
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