A task’s “nice” value describes its priority within the completely fair
scheduler; its semantics have roots in ancient Unix tradition. Last
August, a “latency
nice” parameter was proposed to provide similar control over a task’s
response-time requirements. At the 2020 Power Management and Scheduling
in the Linux Kernel summit (OSPM), Parth Shah, Chris Hyser, and Dietmar
Eggemann ran a discussion about the latency nice proposal; it seems that
everybody agrees that it would be a useful feature to have, but there is a
wide variety of opinions about what it should actually do.

Source: LWN.net – [$] The many faces of “latency nice”