title: how to have linux kernel export /proc/[pid]/io?
body: <p>Im running linux on my board and have to read info in /proc/[pid]/io. But it is not found.</p>
  
  <p>For ex:</p>
  
  <pre><code>$ dd if=/dev/zero of=/tmp/aa &amp;
  [1] 926
  $ cat /proc/926/io
  cat: /proc/926/io: No such file or directory
  </code></pre>
  
  <p>Which I need enable to have kernel export that?</p>
  
  <p>Many thanks for your help!</p>