/FORKLOCK=forklock
       /NOFORKLOCK

    The /FORKLOCK=forklock qualifier specifies the display of
    a specific forklock, for example, /FORKLOCK=IOLOCK8 or
    /FORKLOCK=IPL8.

    The /NOFORKLOCK qualifier specifies that no forklock trace
    information be displayed. By default, all fork trace entries
    are decoded and displayed.