Linux Observability with BPF
As someone who has gone through the ipfwadm -> ipchains -> iptables history, I would generally be pretty meh about another firewalling change.  But, I have high hopes that it'll give me the ability to do reasonable traffic shaping in Linux.I once set up a FreeBSD box to do shaping for an ISP's entire DSL customer base, and it was a couple commands and worked brilliantly!  By contrast, I've dabbled with Linux shaping for ~2 decades, and the best I've gotten is one recipe that works well for one limited use case.  Maybe it's just me, but I've never been able to make it do my bidding, despite several occasions sitting down and giving it the old college try.For other kernel paths, I'm really interested in using it to monitor for file modifications in the way that inotify is not very good.  And I often resort to strace to figure out low level what is going on, it might be really good for that too.Looks like an interesting book!