Re: [PATCH RESEND] scsi: Output error messages using structured printk in single line

[Christoph Hellwig <hch@infradead.org>]

On Wed, May 21, 2014 at 08:30:58AM +0200, Hannes Reinecke wrote:
> While this works reasonably well for most things, printing out
> decoded sense with just one line (and not end up in massive switch()
> statements) is near impossible.
> 
> Plus you'll end up having to use a static buffer at one point, which
> again increases the stack size.
> 
> The alternative approach as discussed at LSF is to move scsi_logging
> over to tracing. There is already some coding for scsi tracing, but
> in most cases it just duplicates existing logging statements.
> So if we were to replace the entire scsi_logging infrastructure
> with scsi tracing most of the issues (like chopped-up CDBs) would
> be gone.
> Plus we would have a far better control about _what_ is being printed.
> 
> And yes, I do have some patches for that :-)

I think any detailed logging of sense codes, cdbs and co should move
to tracing.  In fact generally any non-defauly logging probably is
better off in the tracing subsystems, but there might be a few
exceptions.