For people who would like to experiment with the multi-kernel Linux concept, Cong Wang has
announced the
release of mklinux v7.0-mk2.

mklinux lets one machine run several independent Linux kernels at
the same time on bare metal, without a hypervisor. A host kernel
owns a pool of CPUs, memory and PCI devices, carves that pool into
instances, and boots a spawn kernel into each instance through
kexec_file_load(). Every spawn kernel runs natively on its own
CPUs, its own physical memory and its own devices. Nothing is
emulated and nothing is trapped; the only thing shared is what you
choose to share.

Note that this is not the old MkLinux, which was a port to PowerPC
Macintosh systems.

https://lwn.net/Articles/1090582/
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