First public release of the multikernel Linux tree runs several kernels on one machine on bare metal without a hypervisor

Sources: announcement, repository, submission
Summary: Cong Wang announced the first public release of the multikernel tree on the linux-kernel list on 2026-08-25. The tree runs several independent kernel instances on one physical machine on bare metal, with no hypervisor. The announcement carries its own lmbench and will-it-scale tables, and puts the gain on the will-it-scale results while the lmbench syscall-path controls are unchanged. The code is published at github.com/multikernel/linux.
Why it matters: The published will-it-scale numbers put the gain on lock contention a single kernel cannot shard, with unchanged syscall-path controls, which is a different lever from the namespace and container isolation the same machine already has.