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This is one of my favorite books. A true classic. There are follow-ups in that style for Linux and FreeBSD as well. I think Robert Love wrote the former.

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And Marshall Kirk McKusick wrote the latter, "The Design and Implementation of the FreeBSD Operating System"

Thanks, pretty sure that's the one I meant.

I used this book as a primary reference for OS design (along with The Dinosaur Book) when designing my hobby OS.

The FreeBSD kernel/world is almost exquisite in it's engineering simplicity. Compared to the sometimes chaotic world of GNU/Linux (in my experience).

Thank you! I was going to ask for the latest linux variant - are you speaking of Love's "Linux Kernel Development", or "Linux in a Nutshell"?

I've been a primary linux user for a couple decades now but I'm not too keen on digging into kernel hacking but love details like the OPs post.

The Kernel Development book. It gives a tour. Read the UNIX one first though.

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