Not only that.  Userspace code.  I’ll have to try this on my Linux box.

To his credit Poettering did come back with a response to prove Torvalds wrong. Poettering provided a non kernelspace patch that speeds up Linux systems. The patch involved a simple edit of a users ~/.bashrc file with four new lines of code.

  if [ "$PS1" ] ; then  
          mkdir -m 0700 /sys/fs/cgroup/cpu/user/$$
          echo $$ > /sys/fs/cgroup/cpu/user/$$/tasks
  fi
Then, as the superuser do this:

  mount -t cgroup cgroup /sys/fs/cgroup/cpu -o cpu
  mkdir -m 0777 /sys/fs/cgroup/cpu/user

Forget 200 lines, Red Hat speeds up Linux with 4 lines of code - InternetNews:The Blog - Sean Michael Kerner

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