Core scheduling is a proposed modification
to the kernel’s CPU scheduler that allows system administrators to control
which processes can be running simultaneously on the same processor core.
It was originally proposed as a security mechanism, but other use cases have shown up over time as
well. At the 2020 Power
Management and Scheduling in the Linux Kernel summit (OSPM), a group of
some 50 developers gathered online to discuss the current
state of the core-scheduling patches and what is needed to get them into
the mainline kernel.

Source: LWN.net – [$] Completing and merging core scheduling