netdev - Re: [PATCH] [RFC] C/R: inet4 and inet6 unicast routes (v2)

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Date:	Mon, 03 May 2010 07:21:02 -0700
From:	Dan Smith <danms@...ibm.com>
To:	hadi@...erus.ca
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>, containers@...ts.osdl.org,
	Vlad Yasevich <vladislav.yasevich@...com>,
	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH] [RFC] C/R: inet4 and inet6 unicast routes (v2)

j> The problem as i see it (with all net structures not just routes -
j> i was equally pessimistic when i saw those other net structure
j> checkpoint/restore changes) is you are faced with a herculean
j> high-maintainance effort...  You have a separate piece of code
j> which populates structures that _you_ maintain for attributes that
j> are defined elsewhere by other people.  Nobody adding a new
j> attribute that is very important to route restoration for example
j> is likely to change your code. Unless you tie the two together (so
j> changing one forces the coder to change the other).  And once
j> people deploy kernels it is hard to change. Historically (for
j> pragmatic reasons) such rich interfaces sit in user space - much
j> easier to update user space.

The benefits of doing what we can in userspace are well-understood and
arguing for doing so where it makes sense is, of course, a good idea.

However, it seems to me that the rtnl interface provides us a
reasonable layer of isolation between us and such changes.  Am I
wrong?  The rtnl messages appear to be rather generic and timeless,
and in most cases have a significant amount of flexibility with
respect to allowing advanced attributes to be ignored (which implies
taking the default).

In many other areas of C/R we're not so lucky and don't have a
well-defined interface for dumping that information out of the
kernel...

-- 
Dan Smith
IBM Linux Technology Center
email: danms@...ibm.com
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