Looks fine to me

In D54382#1242898, @zlei wrote:

Also, I plan to merge each commit as a single cherry pick and push them in one go. Looks to me like the best way, if merging them in a single commit is preferred please let me know.

Given this is a new feature, I think it will be much more clean to merge all related commits into a single one when MFCing.

Forgot to add references:

Thanks for the suggestions. I hope this patch update addresses all the issues.

Simplified patch, using u_int as suggested.

Updated the patch to use 32 bit sized counter and atomic(9) methods.

I think you're correct. Also adding the #ifdef looks a little ugly to me, and I'd be happy to avoid that.

THanks for the feedback!