The code for this article is available for download at ftp.ssc.com/pub/lj/listings/issue133/7905.tgz [1].
Another article on Kprobes can be found here: www-106.ibm.com/developerworks/library/l-kprobes.html [2]
Kprobes Home Page: www-124.ibm.com/developerworks/oss/linux/projects/kprobes [3]
Site for getting the kernel source: www.kernel.org [4]
Instructions on Compiling Extra Modules: lwn.net/Articles/21823 [5]
Links:
[1] ftp://ftp.ssc.com/pub/lj/listings/issue133/7905.tgz
[2] http://www-106.ibm.com/developerworks/library/l-kprobes.html
[3] http://www-124.ibm.com/developerworks/oss/linux/projects/kprobes
[4] http://www.kernel.org
[5] http://lwn.net/Articles/21823