[PATCH 35/35] monitor: add option --keep/-K

[Sagi Grimberg]

>>> With this option, "nvme monitor" will keep created discovery
>>> controllers
>>> running even after it exits. If running in the initrd, this is will
>>> be
>>> done automatically. That has the advantage that the new monitor
>>> instance
>>> that will be started automatically after switching root can simply
>>> take
>>> over the already created discovery controllers.
>>
>> Why not make it the default?
> 
> Well, we've had a lot of discussions about persistent discovery
> connections not being universally loved. So I thought I'd make cleaning
> up the default.

Heh... well, I didn't see thus far of any other good suggestion on how
to propagate discovery change log events reliably (I've seen some bad
ones). And we are assuming that hosts need to know about these
changes...

The default matters here. The spec tells us how to learn about
change log events so I would suggest we follow it.