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 I recently read an article on OMG Ubuntu about a kernel patch scheduled to land in 2.6.38. There is also a Phoronix article showing video of the speed and responsiveness of the patch. popey then posted on askubuntu.com asking how we include this patch in Ubuntu. A reference there pointed to the two userspace options using cgroups. I have used the second one by Vivek Goyal.

I have tested this on 10.10 (Maverick) x86_64. I am not sure about other releases.

Instructions (italic are the commands to enter or configs to paste)

apt-get install cgroup-bin

Edit /etc/cgconfig.conf

mount {

group . {
                    perm {
                             task {
                                    uid = root;
                                    gid = adm;
                             }

                             admin {
                                    uid = root;
                                    gid = adm;
                             }
                     }

                     cpu {
                     }
              }

Restart cgconfig

sudo /etc/init.d/cgconfig restart

Add the following to your user .bashrc

if [ "$PS1" ] ; then
        mkdir -m 0700 -p /mnt/cgroups/cpu/$$
        echo 1 > /mnt/cgroups/cpu/$$/notify_on_release
        echo $$ > /mnt/cgroups/cpu/$$/tasks
fi

Create the file /bin/rmcgroup

 #!/bin/bash
rmdir /mnt/cgroups/cpu/$1

Make the file executable

chmod a+x /bin/rmcgroup

As root run

echo "/bin/rmcgroup" > /mnt/cgroups/cpu/release_agent

This will remove the PID on logout. You also may want to put that in /etc/rc.local or in the cgconfig file to be done everytime as its not persistant.

What should happen

Start a new shell (terminal shell is ok) and you should notice in /mnt/cgroups/cpu a directory with a PID of your process. That should be all thats needed according the the posts. Can anyone confirm via benchmark?