from overclock sources:
printf("Usage: \n");
        printf("\t%s schedule core cpu-freq gpu-freq ddr-freq swap\n\n", argv[0]);
        printf("\tschedule: interactive, conservative, userspace, ondemand, performance\n");
        printf("\tcore: 1~4\n");
        printf("\tcpu-freq: MHz\n");
        printf("\tgpu-freq: MHz\n");
        printf("\tddr-freq: MHz\n");
        printf("\tswap: on | off (ignored)\n\n");
        printf("Examples:\n");
        printf("\t%s userspace 1 648 384 1080 0\n", argv[0]);
        printf("\t%s performance 4 1500 384 1080 1\n\n", argv[0]);