title: Understanding Perf Tool Output
body: <p>I recently installed Perf tool On my platform and wanted to use it for profiling my platform. I started profiling a standalone application.Below command I used</p>
  
  <p>perf start ./helloworld</p>
  
  <p>Performance counter stats for './helloworld':</p>
  
  <pre><code>  4.555957 task-clock                #    0.000 CPUs utilized
           1 context-switches          #    0.219 K/sec
           0 cpu-migrations            #    0.000 K/sec
         124 page-faults               #    0.027 M/sec
         &lt;not supported&gt; cycles
         &lt;not supported&gt; stalled-cycles-frontend
         &lt;not supported&gt; stalled-cycles-backend
         &lt;not supported&gt; instructions
         &lt;not supported&gt; branches
         &lt;not supported&gt; branch-misses
  
         60.005519331 seconds time elapsed
  </code></pre>
  
  <p>Now I am not sure how should I interpretate this output.is it expected output?</p>
  
  <p>Also,what should I make of &lt; not supported > filed here,Is there anything I need to enable to support this filed before run the command?</p>