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From: cskim@cslsun10.sogang.ac.kr (Kim Chang Seob)
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Hi. there
I,ve been trying to look up at more and more of the kernel as my knowledge of OS. 
but I can't look up about the frame allocation. 
please helpful about below. 
1. after exec(), when process request his physical memory, 
   how many memory is allocated or what percent(%) is allocated? 
   and where is frame allocation function? 
   where is frame allocation fomula? 
2. when process request his memory, 
   how memory is allocated? 
   random or sequence, 
   I don't know where is allocation function? 
3. in vm_fault.c , VM_FAULT_READ_AHEAD is 4 and 
   VM_FAULT_READ_BEHIND is 3. 
   I don't know how 3 or 4 is selected?