Description:
In 1999, MontaVista introduced as a patch to the 2.4 Linux kernel, the MontaVista Preemptible Linux Kernel that leveraged the spin-locks that protect critical regions in the Linux Symmetric Multi-Processing (SMP) kernel. The MontaVista Linux Preemptible Kernel was adopted by the Linux kernel project as a mainstream feature. It is now a standard build option for the 2.6 Linux kernel, enhancing performance for embedded and enterprise applications alike.

Project Page:
http://kpreempt.sourceforge.net/