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Cache placement policies
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<p>Cache placement policies are policies that determine where a particular memory block can be placed when it goes into a <a href="/facts/CPU_cache/x8BYFcdv">CPU cache</a>. A block of memory cannot necessarily be placed at an arbitrary location in the cache; it may be restricted to a particular <a href="/facts/CPU_cache/x8BYFcdv">cache line</a> or a set of cache lines by the cache's placement policy. </p><p>There are three different policies available for placement of a memory block in the cache: direct-mapped, fully associative, and set-associative. Originally this space of cache organizations was described using the term "congruence mapping". </p>