Calculate time taken to perform a context switch ?

Question

Let n be the number of general registers in a CPU, m be the number of status registers, b be the number of store operations to save a single register, and K be the amount of time to perform a store instruction. How long does it take to perform a context switch ?

• A. (n+mb)K
• B. (n+m)b*K
• C. K + nb + mb
• D. Knb + m

Comments

shiva is the answer (b)

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Yes .

Key says answer is B

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For a single register its bK as we will need K time for each store instruction and for each register we need b such store instruction.  The total number of registers is (m + n).

So B.