Add command `hugetop`

[cakebaker]

hugetop: Report hugepage usage of processes and the system as a whole.

Please note: this is a new utility and only available since procps-ng v4.0.5.

[eduardorittner]

Hi! I'd like to work on this

[cakebaker]

@eduardorittner sure, go ahead :)

[eduardorittner]

Nevermind I can just use parse_smap_entries which is exactly what I want