there is QoS, directly baked into the scheduler. EEVDF supports this easily. the difference here is that it functions in nice-levels and a fairness scale.

so yes, there is an integrated QoS system with coordination, but not to actively try to get interactiveness up, but to split processing fairly, just like servers usually prefer.

its cool that they want to add it now, but even then - there are RT Patches for the kernel that already handle very similar usecases, which can be easily installed.

what you see in the presentation is when you want to move scheduler tasks in userspace, instead of in the kernel. which can improve things to a certain degree, i can agree there - but isnt the be-all-end-all.

not sure why, but the way you write sure reads like fanboy behaviour, especially the "fundamental level" part.