title: What are Fill/Evict buffers
body: <p>Arm A72 core TRM specifies that L1 has a 'fill buffer' and that L2 has a 'fill/evict queue' and the manual does not mention anywhere what they do.
  Am I right in assuming the following</p>
  <ol>
  <li>Fill buffer is something that temporarily holds a cache line before it is loaded onto the cache (but why?)</li>
  <li>Evict queue buffers a cache line when it is evicted from the cache and before it is written back to the memory.</li>
  </ol>