Evolution of the x86 context switch in Linux

While researching archaic facts about the 80386 hardware context switch last weekend, I remembered that early versions of the Linux kernel relied on it. I was promptly sidetracked for hours reading code I hadn’t seen in years. This weekend, I’ve decided to write down the journey to consolidate all the nuggets of fun stuff I discovered along the way.

http://www.maizure.org/projects/evolution_x86_context_switch_linux/