Hello all, I would like to clone a virtual address space so that the address spaces share physical pages until a write happens, at which point it would copy to a new physical page. I've looked around and haven't found any documentation. Certainly fork() already does this, but is there already simple way to do it with a virtual address space? That is, does anything already implement the hypothetical vmalloc_clone in this example (4k pages): v = vmalloc(1024*1024); v[0] = 1; v[4096] = 2; v_copy = vmalloc_clone(v); v_copy[0] = 3; /* copy-on-write */ And then the following expressions would still be true: /* different pages */ v[0] == 1; v_copy[0] == 3; /* shared page */ v[4096] == 2; v_copy[4096] == 2; Thank you for your help! -- Eric Wheeler
