title: How to explain Linux perf tool's result
body: <p>I am trying to use Linux perf to profile a few programs and check the potential ways to improve their performance. However, I barely can understand the result of perf.data. The attached screenshots are perf.data contents. Would be really appreciated it if anyone could help me.</p>
  <p><a href="https://i.stack.imgur.com/GdNoo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GdNoo.png" alt="This is the result of a java program" /></a></p>
  <p><a href="https://i.stack.imgur.com/Q9D5h.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q9D5h.png" alt="This is souffle, a C++ program" /></a></p>