Cannot set memory.memsw.limit_in_bytes for a particular cgroup

[Andrew Martin <andrew.s.martin@xxxxxxxxx>]

Hello,


I am running a VM with Ubuntu Server 10.04 amd64. I have installed and
configured cgroups to limit the resources available to samba, nfs, and
apache. My configuration is as follows:
/etc/cgconfig.conf
group nfs {
        memory {
                memory.limit_in_bytes = 500M;
                memory.memsw.limit_in_bytes = 1000M;
        }
        cpu {
                cpu.shares = 10;
        }
}

group smb {
        memory {
                memory.limit_in_bytes = 1500M;
                memory.memsw.limit_in_bytes = 2000M;
        }
        cpu {
                cpu.shares = 13;
        }
}

group apache {
        memory {
                memory.limit_in_bytes = 6G;
                memory.memsw.limit_in_bytes = 6G;
                memory.swappiness = 5;
        }
        cpu {
                cpu.shares = 100;
        }
}


mount {
        cpu = /mnt/cgroups/cpu;
        cpuacct = /mnt/cgroups/cpuacct;
        memory = /mnt/cgroups/memory;
        cpuset = /mnt/cgroups/cpuset;
}

/etc/cgrules.conf
## Samba Server
root:/usr/sbin/smbd             cpu,memory      smb/
root:/usr/sbin/nmbd             cpu,memory      smb/

## NFS Server
root:/usr/sbin/exportfs         cpu,memory      nfs/
root:/usr/sbin/rpc.mountd       cpu,memory      nfs/
root:/usr/sbin/rpc.nfsd         cpu,memory      nfs/
root:/usr/sbin/rpc.svcgssd      cpu,memory      nfs/
root:nfsd                       cpu,memory      nfs/
root:nfsd4                      cpu,memory      nfs/

## Apache Webserver
root:apache2                    cpu,memory      apache/
www-data                        cpu,memory      apache/

Both memory.limit_in_bytes and memory.memsw.limit_in_bytes seem to
work fine for the smb cgroup, but no matter what values I use for the
apache cgroup I cannot set memory.memsw.limit_in_bytes. My goal is to
disable apache's ability to swap by setting memory.limit_in_bytes and
memory.memsw.limit_in_bytes to the same value. After running "service
cgconfig restart" to restart the cgconfig service, I check the value
of memory.limit_in_bytes and memory.memsw.limit_in_bytes for the
apache group:
# cat /mnt/cgroups/memory/apache/memory.limit_in_bytes
6442450944
# cat /mnt/cgroups/memory/apache/memory.memsw.limit_in_bytes
9223372036854775807

The value for memory.memsw.limit_in_bytes is not being initialized. I
cannot find any related errors in /var/log. I have tried a number of
different values for memory.memsw.limit_in_bytes, however it will not
initialize properly. The only error I can see occurs when I restart
the cgroups service:
Stopping cgconfig service: rmdir: failed to remove `./smb': Device or
resource busy
sed: couldn't flush stdout: No such process
rmdir: failed to remove `./sysdefault': Device or resource busy
sed: couldn't flush stdout: No such process
rmdir: failed to remove `./sysdefault': Device or resource busy
sed: couldn't flush stdout: Invalid argument
rmdir: failed to remove `./sysdefault': Device or resource busy
 *
Starting cgconfig service:

What else can I try in order to properly initialize
memory.memsw.limit_in_bytes? I can temporarily echo a value to it, but
would prefer a permanent solution.

Thanks,

Andrew Martin
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