So, I was wondering - how would I go about implementing copying memory pages (struct page) inside the kernel and utilizing the copy-on-write mechanism instead of transferring the data immediately.
Right now, I copy pages by converting userland addresses to pages, allocating the needed amount of pages using allocate_pages from the kernel, copying them using copy_pages and then finally mapping them into the desired region using install_special_mapping. This works but I feel like this could be optimized using the copy-on-write mechanism.