title: what is the meaning of "units of kilobytes * seconds-of-execution"?
body: <p>I use getrusage api on aix.
  I don't understand ru_idrss field.</p>
  
  <p>ru_idrss
  An integral value of the amount of unshared memory in the data segment of a process (expressed in units of kilobytes * seconds-of-execution).</p>