Debug Logs

Hello all, I am trying to work on the NFS and RPC, i am trying to understand the code, i have enabled the debugging messages of rpc using rpcdebug -m <module> -s all. now i can see that lot of debug can be found in /var/log/messages, i do see that there are lot of other debug messages printed in the nfs using dprint other than there logs, so where can i find those logs, or is there any other way to enable them.