title: Does the terms "user space" and "kernel space" refer to physical memory?
body: <p>When we use the term "user space", do we mean the area in physical memory that contains the code and data of user processes, or do we mean the 3 GB of virtual memory that each process have?</p>
  
  <p>And wen we use the term "kernel space", do we mean the area in physical memory that contains the code and data of the kernel, or do we mean the 1 GB of virtual memory that each process have?</p>