Description of task

The FreeBSD handbook has a chapter on DTrace, which was ported to FreeBSD: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/dtrace.html

However, it does not contain the latest information on DTrace for current releases of FreeBSD. The following wiki pages have detailed information on how to use DTrace:

http://wiki.freebsd.org/DTrace
http://wiki.freebsd.org/DTrace/userland

Your task is to take the information from the wiki page and put the relevant parts (examples, scripts, etc.) into the handbook chapter on DTrace so that more users make use of DTrace's capabilities. The new content of that chapter needs to conform to our documentation code style guidelines as outlined in the Documentation Project Primer for New Committers (see below).

Task requires: 

A FreeBSD system (in a VirtualBox Virtual Machine) installed on your computer. 
Knowledge of the documentation guidelines for the FreeBSD project: http://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/
Check out a copy of the documentation tree from the documentation repository to get the source code for the chapter