What Is an Operating System? with Anil Madhavapeddy
Signals and Threads
Efficiency and Scalability through Paravirtualization and Hypervisors
By paravirtualizing the kernel in Lennox through a hypervisor like Zen, it was possible to deceive the kernel into running as if on real hardware. This technique allowed running multiple operating systems simultaneously on a single physical machine, optimizing the use of resources. The concept of a 'user' shifted from logging into a Windows machine to booting up an operating system, with the hypervisor becoming its own operating system. This innovation paved the way for the growth of cloud computing. Zen, which originated as an experiment, evolved into a product supported with drivers for both Windows and Linux, enhancing its commercial viability.
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