netdev - Re: [RFC] ipv6: Change %pI6 format to output compacted addresses?

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Message-Id: <1250159961.28285.35.camel@Joe-Laptop.home>
Date:	Thu, 13 Aug 2009 03:39:21 -0700
From:	Joe Perches <joe@...ches.com>
To:	Brian Haley <brian.haley@...com>
Cc:	Jens Rosenboom <jens@...one.net>,
	Linux Network Developers <netdev@...r.kernel.org>
Subject: Re: [RFC] ipv6: Change %pI6 format to output compacted addresses?

On Wed, 2009-08-12 at 21:33 -0400, Brian Haley wrote:
> Jens Rosenboom wrote:
> > Currently the output looks like 2001:0db8:0000:0000:0000:0000:0000:0001
> > which might be compacted to 2001:db8::1. The code to do this could be
> > adapted from inet_ntop in glibc, which would add about 80 lines to
> > lib/vsprintf.c. How do you guys value the tradeoff between more readable
> > logging and increased kernel size?
> > 
> > This was already mentioned in
> > http://kerneltrap.org/mailarchive/linux-netdev/2008/11/25/4231684 but
> > noone seems to have taken up on it.
> 
> Anyways, can you try this patch, it's less than 40 new lines :)
> It might be good enough, but could probably use some help.

You'll need to invent a new %p qualifier type to allow
compressed representation.  Your patch will change current uses
with seq_<foo> output in net, which could break userspace.


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