title: Regarding the process status on output of /proc/stat command
body: <p>When I check the process status output of my process thru /proc//stat then got to know mostly it is in "D" state which means Unterrptible sleep. I understand it is doing some operation which cannot be interrupted but could someone help me on listing what all are the operations includes in this IO/Uninterruptible sleep ? </p>
  
  <p>Any link also would be fine to understand.</p>
  
  <p>D Uninterruptible sleep (usually IO)
  R Running or runnable (on run queue)
  S Interruptible sleep (waiting for an event to complete)
  T Stopped, either by a job control signal or because it is being traced.
  W paging (not valid since the 2.6.xx kernel)
  X dead (should never be seen)
  Z Defunct ("zombie") process, terminated but not reaped by its parent.</p>
  
  <p>Thanks..</p>