[CentOS] How to update modules in iniramfs fastly

Mon Feb 26 01:28:31 UTC 2018
wuzhouhui <wuzhouhui14 at mails.ucas.ac.cn>

I know dracut can update modules in initramfs, but I think it is too
slow. So I'm wondering what is the fastest way to update modules in
initramfs of CentOS 7?

Thanks!