title: Output from bpf_printk()
body: <p>While running some examples from <code>samples/bpf</code> I noticed that <code>bpf_printk</code> output is prepended with some extra information, e.g. :</p>
  
  <pre><code>telnet-470   [001] .N.. 419421.045894: 0x00000001: BPF command: 2
  </code></pre>
  
  <p><code>BPF command: 2</code> is actual string passed to <code>bpf_printk</code> in the bpf program, but what is the rest? I assume this comes from kernel's JIT ?</p>
  
  <p>Where can I look closer what those bits mean?
  Thanks.</p>