Re: linux compat: namespaces and cgroups

> From: Ed Maste <emaste@freebsd.org>
>
> One thing that might be useful to folks who might work on the FreeBSD
> kernel side is to build up a collection of small programs that
> demonstrate these syscalls and interfaces.

Agreed. In my spare time I can use this as a research op to get a little more
into the guts of how these toolsets are both leveraged today in various 
projects and what usecases would be most beneficial to the FreeBSD
community. Without a functioning kernel interface in place I'm assuming
we would be testing against a vm of centos. I noticed the linuxulator will
be compatible with linux 4.4.0 in 14-CURRENT. Would that be a good
target to write against?

> To some extent I think we
> can separate functionality from priority/limit controls.
> Demonstrations for setns, unshare, and clone would be interesting.

Agreed.

> Several of us have had an interest in this for some time, but I am not
> aware of any existing significant work. We've spoken about starting a
> regular call for these topics in the near future, and I'll follow up
> when ready to move forward.

I appreciate that. Looking forward to those topics. Hopefully, not too
soon so maybe I will have had enough time to research to provide
some solid contributions to the conversation.

So catch me if I missed something, but it sounds like prior the
following two tasks could be worked on in parallel:

1. Find and document examples from how these functions are 
leveraged today and consolidate them to simple compilable source.

2. Generate user-land utilities that can either mock or mimic the 
behavior of setns, unshare, and clone on FreeBSD. 

Cheers.



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