title: What does the User/Supervisor bit in the page table entry mean?
body: <p>I am trying to understand whether: </p>
  
  <ol>
  <li>the User/Supervisor bit is used to distinguish pages of kernel memory, from those of the user process</li>
  <li>the User/Supervisor bit changes when execution moves to the kernel while executing a system call</li>
  <li>Or perhaps none of them.</li>
  </ol>
  
  <p>Can someone clarify?</p>