memory page sharing
 

I am working in memory deduplication. I want to change ksm.c in linux kernel. I have generated patch also. what are all the steps needed to bring this (changes effect) into the kernel?

I don't really know anything about this, but you say you have a patch? You can use the patch command to patch the *.c file assuming that is what the patch is for. Then you should be able to re-compile the kernel. I'm pretty sure that's how it would be done. Do you have any more specific information about what you are trying to accomplish? I don't know anything about memory duplication but someone else might be able to help if you give some more info.

Use 'man patch' for more information.

Take a look at this.
https://www.kernel.org/doc/Documentation/vm/ksm.txt

I hope it will help.