title: Measure cache line utilization
body: <p>Is there a way to measure cache line utilization? By cache line utilization I mean the fraction of cache line bytes that are read or written before a cache line is evicted. My target is an Intel CPU running Linux. The measurements don't necessarily need to come from the physical CPU itself. A simulation like valgrind uses is fine too.</p>
  
  <p>The motivation is that this could be a useful way to skim code for areas where changing memory layout is worth considering.</p>