title: What is page table entry size?
body: <p>I found this example.</p>
  
  <blockquote>
    <p>Consider a system with a 32-bit logical address space. If the page
    size in such a system is 4 KB (2^12), then a page table may consist of
    up to 1 million entries (2^32/2^12). Assuming that
    <strong>each entry consists of 4 bytes</strong>, each process may need up to 4 MB of physical address space for the page table alone.</p>
  </blockquote>
  
  <p>What is the meaning of <strong>each entry consists of 4 bytes</strong> and why <strong>each process may need up to 4 MB of physical address space for the page table</strong>?</p>