From: James Chapman <jchapman@katalix.com>
Date: Thu, 01 Apr 2010 08:19:43 +0100

quoted text
> There might be thousands of L2TP sessions in some setups. Populating
> sysfs with a link for each of those sessions isn't practical. The
> existing /proc file dumps its info as a single text file for this
> reason. I'd also like to provide the device name in the session netlink
> message, which is the interface used by l2tp userspace, so I need a
> kernel API to retrieve the device name from ppp.

Scalability concerns are also another reason _not_ to use
procfs.

Use netlink or similar, which can dump with filtering and
proper queueing.
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