$ grep -P '\(.+\)' gtop_docu
    my $fsusage = $gtop->fsusage($disk);
    my $mountlist = $gtop->mountlist($all_fs);
    my $netload = $gtop->netload($interface);
    my $proc_args = $gtop->proc_args($pid);
    my $proc_map = $gtop->proc_map($pid);
    my $proc_mem = $gtop->proc_mem($pid);
    my $proc_segment = $gtop->proc_segment($pid);
    my $proc_state = $gtop->proc_state($pid);
    my $proc_time = $gtop->proc_time($pid);
    my $proc_uid = $gtop->proc_uid($pid);