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In a demand paging memory system, page table is held in registers. The time taken to service a page fault is $8$ m.sec. if an empty frame is available or if the replaced page is not modified, and it takes $20$ m.secs., if the replaced page is modified. What is the average access time to service a page fault assuming that the page to be replaced is modified $70$% of the time ?

  1. $11.6$ m.sec. 
  2. $16.4$ m.sec. 
  3. $28$ m.sec. 
  4. $14$ m.sec.
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can anyone please tell what is the meaning of “replaced page is modified”.
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Service a page fault=8msec.

Page is not modified=20m.sec.

Page replace=70% of time

the average access time to service a page fault=0.7⨉20+0.3⨉8=14+2.4=16.4ms
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srestha...u did wrong..

if an empty frame is available or if the replaced page is not modified = 8 m.secs.,

if the replaced page is modified. = 20 msec
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yes @Tauhin ,thanks
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