[PATCH] admin-cmd: Added smart-log command support.

[Christoph Hellwig]

On Sun, Sep 04, 2016 at 11:41:09AM +0300, Sagi Grimberg wrote:
> Given that we don't own the namespaces, I'm wandering if this is the
> correct way to do this... I'm not at all convinced that having something
> else reading/writing to the blkdevs other than nvmf is a valid/useful
> use-case but in this situation we won't get correct log information
> (or at least the semantics is wrong).
> 
> Should we maintain these statistics in the target stack instead?

What's the problem with including possible local I/O?  Having to
maintain another set of counters, including atomics in the fast path
or complex per-cpu infrastructure is something I'd rather avoid.