Port memory printing on OpenBSD

[lucic71]

• Split print_memory into get_memory_info which is platform dependent and print_formatted_memory which is platform independent
• Created struct print_mem_info that keeps memory counters which will be passed between get_memory_info and print_formatted_memory
• Used UVM subsystem to get memory counters on OpenBSD
• Added the requirements in README
• src/print_cpu_usage.c does not compile on OpenBSD because of the conditional definition of __OpenBSD__

[lucic71]

I still need to find a way to get buffers, cached and shared memory. If you have any idea how to do that it would be much appreciated.

[lucic71]

@stapelberg is this repo still active?

[stapelberg]

Yes, this is still active, but I don’t really have time to answer development questions, sorry. I can try to review and merge your PR once you let me know it’s ready (it sounded like it wasn’t ready currently).

[lucic71]

@stapelberg, it's ready for reviewing!

[stapelberg]

@stapelberg, it's ready for reviewing!

Thanks, this looks reasonable on first glance.

Can you format your code with clang-format to make the CI pass? Have you run the tests yet to ensure they pass, too?