message: use mem_info.free instead of avail
diff: @@ -553,7 +553,7 @@ where
  // mem_info gives us kB
  let total = mem_info.total * 1024;
  - let consumed = total - (mem_info.avail * 1024);
  + let consumed = total - (mem_info.free * 1024);
  // whereas jemalloc_ctl gives us the numbers in bytes
  match jemalloc_epoch::mib() {
  