Ok I may have got the name wrong :). What I am trying to do is to implement a package on linux similiar to the TreadMarks by Alan Cox et al. (ref. http://citeseer.ist.psu.edu/amza96treadmarks.html) that runs at kernel level instead of user level. Right now I think that inorder to achieve what I want to do, I have to change the code of the linux virtual memory manager. This is ok for academic purposes (which is my aim) however it severly reduces portability (it is much easier to just load a kernel module than to patch and recompile the kernel).Kernel-level thread or code can modify mm_struct,vma,pde,pte,page protection bits,etc.