OPT_U64
OPT_U64('l', "loop", &loops, "Specify number of loops"),
OPT_U64(0, "duration", &kvm->duration,
OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
OPT_U64('c', "count", &opts->user_interval, "event period to sample"),