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From: cskim@cslsun10.sogang.ac.kr (Kim Chang Seob)
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I want to some function or variable in vm_page_startup() in vm_page.c 
1. what is different between page_range and npages? 
2. what is different between round_page and trunc_page? 
3. what is start , size? 
4. why need the biggestsize in the function? 
5. Is first_page page number or address? 
I want to know some answer.