Made easy booklet - Memory management

Question

Given following data, find average access time. Please explain the solution.

Answer 1

Average access time= Avg. access time for TLB HIT + avg. access time for TLB MISS.

Avg. access time for TLB HIT= TLB hit ratio*(M.M access time)

Avg  access time for TLB MISS= TLB miss ratio*(M.M access time + Avg time for page fault + Avg. time for Dirty page replacement)

Avg access time = (1-Pt)(Tm) + Pt*(Tm + Pp(Td+Pd*Td))

Avg access time = (1-0.1)(1) + 0.1*(1 + 0.0002(10⁴+0.5*10⁴))=1.3 units