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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next-2.6] net: pskb_expand_head() optimization
Date: Sat, 11 Sep 2010 20:30:02 -0700 (PDT)
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From: Jarek Poplawski <jarkao2@gmail.com>
Date: Sat, 11 Sep 2010 14:31:40 +0200

> Otherwise seems OK, but I still would like to know the scenario
> demanding this change.

I want to make sk_buff use list_head, including all uses such as
frag_list et al.

If the frag_list chain can be shared, a doubly linked list cannot be
used.

This is someting I've been gradually working on now for more than 2
years :)