title: How to select linux process scheduler in menuconfig while kernel compilation
body: <p>I need to select O(1) process scheduler in linux kernel!
  but i can't find where to select it in menuconfig window.
  how to change from O(1) to CFS and vise versa?</p>
  
  <p>edit:
  please attention to PROCESS SCHEDULER. I do not mean I/O SCHEDULER. </p>