Understanding BIND9 code

[narendar reddy]

Hi all,
         I am doing my Project on* " Improving BIND9 name server *
*Performance."*  For this i have to i dentify the hot spots ( code fragments
which
take more execution time) in BIND9 code. But i dont know where to start to
understand the code.
i came to know  files like mem.c, name.c, buffer.c, client.c, qery.c,
rdataset.c under the
directories     \bind-9.3.1\lib\isc, \bind-9.3.1\lib\dns, \bind-9.3.1\named
are major one.
Please suggest me in understanding these files. or send me the links where i
will get
the documentation about these files.

Thanking you