cgroup tasks file error

[Li Zefan]

ccmail111 wrote:
> Hi Serge,
> 
> Now I cannot move the pid out of the assigned group !
> 

Try:

  $ sudo echo 580 > tasks

> [host:/dev/cgroup]$ cat cpuset.cpus
> 0
> [host:/dev/cgroup]$ cat cpuset.mems
> 0
> [host:/dev/cgroup]$ cat hello/tasks
> 580
> 
> [host:/dev/cgroup]$ echo 580 > tasks
> -bash: echo: write error: Operation not permitted
> 
> [host:/dev/cgroup]$
> [host:/dev/cgroup]$ cd hello
> [host:/dev/cgroup/hello]$ cat cpuset.cpus
> 0
> [host:/dev/cgroup/hello]$ cat cpuset.mems
> 0
> [host:/dev/cgroup/hello]
> 
> 
> 
> --- On Mon, 12/13/10, ccmail111 <ccmail111 at yahoo.com> wrote:
> 
>> From: ccmail111 <ccmail111 at yahoo.com>
>> Subject: Re: cgroup tasks file error
>> To: "Serge E. Hallyn" <serge.hallyn at canonical.com>
>> Cc: containers at lists.linux-foundation.org
>> Date: Monday, December 13, 2010, 8:23 PM
>> Hi Serge,
>>
>> Thanks for quick response.
>>
>> I had mounted as:
>>
>>  mount -t cgroup cpuset /dev/cgroup
>>
>> After setting below, it works.
>> Thank you for helpful tip !
>>
>>
>> --- On Mon, 12/13/10, Serge E. Hallyn <serge.hallyn at canonical.com>
>> wrote:
>>
>>> From: Serge E. Hallyn <serge.hallyn at canonical.com>
>>> Subject: Re: cgroup tasks file error
>>> To: "ccmail111" <ccmail111 at yahoo.com>
>>> Cc: containers at lists.linux-foundation.org
>>> Date: Monday, December 13, 2010, 6:16 PM
>>> Quoting ccmail111 (ccmail111 at yahoo.com):
>>>> I see error:[host:/dev/cgroup]$ echo 693 >
>>> hello-test/tasks
>>>> -bash: echo: write error: No space left on
>> device
>>>> [host:/dev/cgroup]$ pwd/dev/cgroup
>>>>
>>>> But the user process is up and running..
>>>>
>>>> [host:/dev/cgroup]$ ps aux | grep procroot    
>>   
>>>> 693  0.0  0.4  34720  1112 ttyS0    Sl  
>> 19:11
>>>   0:00 /opt/bin/myproc -ext
>>>> Also the cgroup exists and valid..
>>>>
>>>> [host:/dev/cgroup]$ ls | grep hello-test
>>>> hello-test
>>>>
>>>> What above error mean and any suggestions ?
>>>> Please email.
>>> Which cgroups do you have composed on that mount? 
>> I'm
>>> guess you
>>> have cpuset, and you need to set the cpuset.mems and
>>> cpuset.cpus.
>>> Until you do that, no tasks can be assigned to it.
>>>
>>> -serge
>>>
>>
>>
>>
>