It includes 12 articles on experimental developments that may be included in the Linux kernel in the future.
You can find the articles in question here:
http://portal.acm.org/toc.cfm?id=1400097
* Minding the gap: R&D in the Linux kernel
by Muli Ben-Yehuda, Eric Van Hensbergen, Marc Fiuczynski
* Introducing technology into the Linux kernel: a case study
by Paul E. McKenney, Jonathan Walpole
* Extending futex for kernel to user notification
by Helge Bahmann, Konrad Froitzheim
* Plan 9 authentication in Linux
by Ashwin Ganti
* Towards achieving fairness in the Linux scheduler
by Chee Siang Wong, Ian Tan, Rosalind Deena Kumari, Fun Wey
* I/O resource management through system call scheduling
by Silviu S. Craciunas, Christoph M. Kirsch, Harald Röck
* PipesFS: fast Linux I/O in the unix tradition
by Willem de Bruijn, Herbert Bos
* CUBIC: a new TCP-friendly high-speed TCP variant
by Sangtae Ha, Injong Rhee, Lisong Xu
* On the design of a new Linux readahead framework
by WU Fengguang, XI Hongsheng, XU Chenfeng
* Practical techniques for purging deleted data using liveness information
by David Boutcher, Abhishek Chandra
* virtio: towards a de-facto standard for virtual I/O devices
by Rusty Russell
* Virtual servers and checkpoint/restart in mainstream Linux
by Sukadev Bhattiprolu, Eric W. Biederman, Serge Hallyn, Daniel Lezcano