[Xen-devel] Xen build process

[George Valzcig <gvalzcig@xxxxxxxxx>]

Hello,
I am a beginner at Xen wishing to understand more about it. I have installed Xen 3.1.0 on debian-etch following this tutorial (http://www.howtoforge.com/debian_etch_xen_3.1). Now I will like to add printks to different source code and recompile to understand better. I dont understand as to the method for doing this.


As per my understanding,  when I run make world the very first time, the following happens
1) Compile code within xen and then make xen.gz and copy this to dist/install/boot
2) Download linux-2.6.18.tar.bz2 - expand that to pristine-linux-2.6.18

3) Copy pristine-linux-2.6.18 to ref-linux-2.6.18 and apply patches in ref-linux-2.6.18 from patches/
4) Copy ref-linux-2.6.18 to linux-2.6.18-xen and apply arch-xen patches to linux-2.6.18-xen
5) makemenuconfig with scripted selections in linux-2.6.18-xen

6) Make the modules using source code in linux-2.6.18-xen and the destination is build-linux-2.6.18-xen_x86_32
7) INSTALL these modules
8) Make vmlinuz
9) Put vmlinuz, config file etc in dist/install/
10) Compile the xen tools (byte compile any python scripts) in tools/ - install them in correct places in dist/install/

11) Then make install copies from dist/install to the correct places on the system.

a) Is my understanding of the process correct?
b) In step 4 the patches - where they are located?
c) In step 7 -I think this copies the modules compiled in step 6 into dist/ - is that right?

d) I touched some files in xen/ and ran make again - I saw that those files alone were recompiled in step 1 (steps 2,3,4,5,6 were not executed)
e) I touched some files in linux-2.6.18-xen/ - but when I run make again these files were not recompiled in step 6. So then I edited linux-2.6.18-xen/fs/udf/dist.c - included a printf with error in syntax - ran make again. The make process completed without any error. I tried this with a couple of other .h and .c files - same result.

So if I want to make changes to the code - where should I make them - how should I compile it?

Thanks



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