title: What does Jetsam really do?
body: <p>In <a href="https://stackoverflow.com/questions/9978135/jettisoned-tasks-still-in-multitasking-bar/10003119#10003119">a question I asked</a> several months ago, I asked if the effect of Jetsam on memory usage can be observed. I answered my own question using instruments, finding that apps killed by Jetsam still had the same memory footprint that they had before they were terminated.</p>
  
  <p>Even today, I still see jettisoned apps in the <s>running task bar</s> recently-used app list. I don't get any performance improvement unless I remove them myself, even after Jetsam has killed them.</p>
  
  <p>If that's the case, what is the purpose of Jetsam and what is it doing (other than killing apps)? I don't see any benefits. Is this a bug?</p>