dtrace:::BEGIN
{
        tracebegin = timestamp;
}

dtrace:::END
{
        printf("trace length (ms): %d\n", (timestamp - tracebegin) / 1000 / 1000);
}

::vtrnd_read:entry
{
        self->s = timestamp;
}

::vtrnd_read:return /self->s/
{
        @count["count"] = count();
        @["ns"] = quantize(timestamp - self->s); self->s = 0;
}