git subtree add

gistfile1.txt

Used this 

# Adding a repository as a subtree to your current repository
$ git subtree add --prefix=path/in/curr/repo \
		git://github.com/yourname/your-repo.git master


git log has entry and histories (i.e all commits) of both repositories

commit d0b0cdeeb29d4512c7426e8f1680505aa3f3c03c
Merge: 05b3ec0 70cf968
Author: Chinmay Kamat <chinmaykamat@gmail.com>
Date:   Sat Apr 20 00:08:24 2013 -0400

    Add 'compiler_node/' from commit '70cf96847238291664a5bd56a01442580bc6f945'
    
    git-subtree-dir: compiler_node
    git-subtree-mainline: 05b3ec0b80321b22c52d9592ad7481f46621ff54
    git-subtree-split: 70cf96847238291664a5bd56a01442580bc6f945


All files inside compiler_node show log as --


$ git log compiler_node/message.py
commit d0b0cdeeb29d4512c7426e8f1680505aa3f3c03c
Merge: 05b3ec0 70cf968
Author: Chinmay Kamat <chinmaykamat@gmail.com>
Date:   Sat Apr 20 00:08:24 2013 -0400

    Add 'compiler_node/' from commit '70cf96847238291664a5bd56a01442580bc6f945'
    
    git-subtree-dir: compiler_node
    git-subtree-mainline: 05b3ec0b80321b22c52d9592ad7481f46621ff54
    git-subtree-split: 70cf96847238291664a5bd56a01442580bc6f945