/USAGE=(HOLD=n,SPIN=n, TOP_PCS=n)

    Specifies thresholds for displaying information on a spinlock.
    If the percentage of time a spinlock is held exceeds the
    value of HOLD=n, where n is a value from 0 to 100, displays
    the information on the spinlock. The default is 10%. If the
    percentage of time a spinlock is spinning exceeds the value of
    SPIN=n, displays the information on the spinlock. The default is
    10%. If either the HOLD or SPIN thresholds are exceeded, displays
    information on a spinlock. The TOP_PCS=n keyword displays the top
    n unique callers to lock a spinlock. The default is to display
    the top five unique callers.

    By specifying either /USAGE=(HOLD=0) or /USAGE=(SPIN=0), SPL
    displays information on all spinlock usage from the trace buffer.