拷贝保持用户信息

cd /old_dir
find . -depth -print | cpio -pdlmv /new_dir

kprobes

http://www.ibm.com/developerworks/library/l-kprobes/index.html

http://lwn.net/Articles/132196/

http://www.redhat.com/magazine/005mar05/features/kprobes/