Red Hat’s Jonas Ådahl began working on this Mutter KMS kernel thread implementation a half-year ago and finally it recently was merged for the GNOME 45 release due out in September. By having this dedicated thread there should be lower latency cursor movements and possible avoidance of cursor stutter. It should be a latency win although various bugs have been reported since this code was merged in late July. But given the timing and still more than one month until GNOME 45.0 ships, everything should be in good shape for the stable debut.
Upstream Merge Request: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2777
Not an expert, but I feel like this might really improve the perceived responsiveness of the system under load.
I thought KMS meant something else
What is the state in kde?
Coincidentally I also merged a kms thread into KWin late July. When dragging windows around, the cursor is now visibly ahead of the window.
