# gate 2018 cse demand paging memory management

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Consider a process executing on an operating system that uses demand paging. The average
time for a memory access in the system is M units if the corresponding memory page is
available in memory, and D units if the memory access causes a page fault. It has been
experimentally measured that the average time taken for a memory access in the process is
X units.
Which one of the following is the correct expression for the page fault rate experienced by
the process?
(A) (D – M) / (X – M) (B) (X – M) / (D – M)
(C) (D – X) / (D – M) (D) (X – M) / (D – X)

## Related questions

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A demand paging system,with page table held in integer,takes $5ms$ to service a page fault if an empty page is available,or if the page to be replaced is not dirty.It takes $15ms$ if the replaced page is dirty. Memory access time is $1\mu s.$ Assume ... . The approximate maximum acceptable page fault rate to meet this time requirement will be______$\%?$ $\text{(Correct to two decimal places).}$