I am working on Jikes RVM. I want to know how to modify the present stop the world mark sweep garbage collector into on the fly mark and sweep garbage collector.
I know there are some handshaking mechanism used to implement on the fly, but i do not understand from where i should start, Which packages i need to modify.
Your best place to look for answers related to JikesRVM is on its website. Specifically, use the researchers mailing list for questions. There are some really great guys there who are always ready to help.
I know that there were some plans for making an on the fly collector for the current version (don't know if they were realized). An on-the-fly collector does exist in previous versions.