ftp://ftp.bupt.edu.cn/pub/Documents/Kernel/linux_process_mgt.PDF
http://www.cs.columbia.edu/~jae/4118-LAST/L14-linux-proc.pdf
http://cse.iitkgp.ac.in/~agupta/OS/MySlide-Process
http://www.enseignement.polytechnique.fr/informatique/INF583/handouts_1x3.pdf
http://www.ibm.com/developerworks/library/l-linux-process-management/