title: why the page size of OS is 4k, and why it still stick to be 4k as the memory can be large enough now?
body: <p>As far as i know, the page size is 4k in OS memory management. It can be a advantage when the memory is too small.
  But the memory in our machine is big enough now, why the page size is still 4k? What is the limit for change it to be like 1M or bigger?</p>