title: No cache event samples for ARM beagleboard running Android
body: <p>I am trying to collect some performance statistics on Beagleboard Rev C4, and Beagleboard xM.  </p>
  
  <p>Oprofile runs perfectly when I set the profiling event to CPU_CYCLE, however on both boards, when I try to profile any cache related events, I get an empty samples folder and no result.</p>
  
  <p>I did not get any error (not even in the kernel messages) when I run oprofile with  </p>
  
  <pre><code>opcontrol --event=L1_DATA_MISS:10000
  </code></pre>
  
  <p>But profiling seem to have failed.  It's the same story for all other cache related events.  Am I doing something wrong, or are these PMUs unavailable on Beagleboards?</p>