title: why kthread have pid 2 and systemd have PID 1?
body: <p>In the systemd environment, when I performed <strong>ps -auxf</strong>, I see that the kthread has PID of 2 while systemd has PID 1 assigned.</p>
  
  <p>So, who assigns PID 2 to kthread and why is it getting PID 2 when kthread is what that calls <strong>systemd</strong>?</p>