alpine linux: pmap output not showing RSS
<p>I have a docker container running a base image of alpine linux and when I exec into the docker container and run the command:</p>

<blockquote>
  <p>pmap -x [pid]</p>
</blockquote>

<p>The headers that I see in the output are:</p>

<p><strong><code>Address  Kbytes  PSS Dirty   Swap    Mode    Mapping</code></strong></p>

<p>I am actually explicitly looking for RSS (Resident Set Size). Why is this header not showing up in the output?</p>