memory management - How to serve a page fault in the linux kernel? -

i working on project requires heavy modifications in linux kernel. in 1 of modifications have change way page fault handler works. to intercept page faults specific processes , satisfy them possible getting copying data machine.

as first step, write experimentation code can me understand how linux satisfies page fault , how tells process page fault can not served right , needs retry @ later time.

so, modify handle_mm_fault in way helps me understand above. this:

int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,                      unsigned long address, unsigned int flags) {      /* code */      if(current->pid == my_target_pid)      {          /*           1. chose randomly between 1 , 2 -> rand_num           2. if rand_num (1) 1 allocate block of memory, write 'x's , give process , return.           3. if rand_num (1) 2 tell process come later , return.          */      }      /* rest of handle_mm_fault other process here */ } 

you can have @ struct vm_operations_struct. function member 'fault' used deal page fault situation