Can anyone recommend any good books/articles/online resources, etc, 
related to BSD kernel internals. I have a set of excellent books by 
Richard Stevens on Unix system and network programming, which I use 
extensively, however I would like to fully understand the lower 
semantics of Unix, i.e. BSD kernel design/implementation. I know there 
isn't a single book which describes everything there is to know about 
operating systems design, but rather there are many books attributed to 
specific topics, i.e. virtual memory, file systems, networking etc.

By the way I was searching on http://www.amazon.co.uk  in "Books 
<http://www.amazon.co.uk/exec/obidos/tg/stores/browse/-/books/266239/ref=br_lr_/202-3619726-4661433> 
 > Subjects 
<http://www.amazon.co.uk/exec/obidos/tg/browse/-/1025612/ref=br_lr_/202-3619726-4661433> 
 > *Computers & Internet"

Search on BSD brings up about 14 pages, there is a link to** "The Design 
and Implementation of the 4.4 BSD Operating System" which seems like a 
good book

Search on Linux brings up 1999 pages!!!

So, if anyone can recommend reading material to get me started on BSD 
kernel hacking etc, please let me know :-)
*