Linuxconf Europe: Kernel Programming and Energy Efficiency
Today, the Linux Conference in Cambridge focused on energy saving and kernel power management.
LinuxConf Europe is a very technical conference. One of the nicest features of this gathering
has been an overt recognition on behalf of the organisers, the UKUUG and GUUG, that
Linux is only a small component of a large software ecosystem; largely the GNU operating
system. Even more impressively, on Tuesday, the conference held an entire session
dedicated to hardware-related issues, specifically power management. At first this may not
appear to be the most interesting topic, but as the kernel continues to mature the
importance of power management is ever-increasing.
Arjan van de Ven of Intel began the session with an overview of common programming
techniques which are the largest wastes of power consumption: unnecessary polling of system
resources, insufficient caching of data being read from hard disk for example. These
examples were largely presented in the context of desktop applications, but the importance
and ramifications spread much further, most notably into the field of mobile devices.
Mobile and embedded Linux have been some of the largest growth areas for the kernel in
recent years (as advanced by devices such as Nokia's Internet Tablets, N770/800 and this
will only accelerate as OpenMoko and Qtopia phones become commercially viable.
The session ended with a talk by Matthew Garrett discussing how programmers need to go
about making Linux less power hungry. He noted that he had calculated his power saving
code, internationally, had saved more energy than he had consumed flying to conferences to
present his work. The ecological argument for this work is clearly apparent. However, it
shall be the increased usage time for mobile devices that will be the most obvious benefit of
A new class of problems lets a malicious app pre-configure an invisible privilege update.
New Hack language adds static typing and other conveniences.
New crypto policy system will offer easier configuration and more uniform security.
Ubuntu founder denounces insecurity in proprietary, close-source software blobs.
Vulnerability affects many Linux web servers
The Bavarian capital shuns Microsoft, Google, and other alternatives to implement an open source groupware solution.
Phone vendor partnerships bring Mark Shuttleworth's dream of Ubuntu on a phone a step closer to reality.
Donors will get to vote on new features for the free video editor.
Debian project puts init out to pasture and says no to Ubuntu's Upstart.