Now I have worked for three months.  I felt very paintful and happy during this period. The linux kernel is my target, and I find it is really very hard for me to catch it.
    I want to begin from process management. 
    The version of kernel is 2.6.  There are many difference between the 2.4 and 2.6.  It seems that the machanism of version 2.6 is more effective. 
    I think I can get the real road of mine.  I will confront the difficulties I meet every day.
    Good luck!