Carrier Grade Linux 5.0 with live patching

Montavista released version 5 of their Carrier Grade Linux, based on the 2.6.21 Linux kernel an integrating the GCC 4.2 compiler. It features real-time application patching, meaning a patch can be applied on a running system, without any need to reboot, and Microstate Accounting, which is intended to provide more accurate reporting of CPU utilization.

From Internetnews.com.