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Re:HelenOS: portable microkernel-based multiserver operating... by naasking on Friday August 18, 2017 @03:09PM (#15048924)
The first PowerPC linux for the Power Mac ran under the Mach microkernel [1].

Then there was also L4Linux, which I believe was the first low-overhead virtualization of Linux using the L4 microkernel. Papers demonstrated < 10% overhead I believe, where previous virtualization efforts were somewhat higher. I'd say it kicked off the whole paravirtualization/virtualization craze.

[1] http://www.mklinux.org/

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