switch tail queue to singly linked list for keeping track of pages
switch tail queue to singly linked list for keeping track of pages

Ignore-this: eb5941aa5d7b6a323e9806fd796eb040

darcs-hash:20100407040407-1a7c6-06f0341c81590bc226b37f70889c6cf5c8d2fb8e

jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc