Question

For inclusion to hold between two cache level L1 and L2 in a multilevel cache hierarchy, which of the following are necessary?

1. L1 must be a write-through cache
2. L2 must be write-through cache
3. The associativity of L2 must be greater than L1
4. The L2 cache must be at least as larger as the L1 cache

• A. $1,2,3and4$
• B. $1and4only$
• C. $1and2only$
• D. $4only$

Answer 1

The correct option is B $1and4only$

$Considerthefollowingdiagram$



$L_{1}mustbewritethroughthen{L}_2$
$alsoupdated.$