title: What causes page faults?
body: <p><a href="http://en.wikipedia.org/wiki/Page_fault" rel="noreferrer">According to Wikipedia</a>:</p>
  
  <blockquote>
    <p>A page fault is a trap to the software raised by the hardware when a program accesses a page that is mapped in the virtual address space, <em>but not loaded in physical memory</em>. (emphasis mine)</p>
  </blockquote>
  
  <p>Okay, that makes sense.</p>
  
  <p>But if that's the case, why is it that whenever the process information in Process Hacker is refreshed, I see about 15 page faults?</p>
  
  <p><img src="https://i.stack.imgur.com/JpvMz.png" alt="Screenshot"></p>
  
  <p>Or in other words, why is any memory getting paged out? (I have no idea if it's user or kernel memory.) I have <strong>no</strong> page file, and the RAM usage is about 1.2 GB out of 4 GB, which is after a clean reboot. There's no shortage of any resource; why would anything get paged out?</p>