Im reading the ostep and i just finished the intro to MLFQ.
Let’s consider the top queue (highest priority one) for my qn, so the tasks in it are scheduled in a RR way with a time slice of lets say 10ms(ive no idea what this value is on modern cpus but in the book from 2008 they say 10ms). I read in the previous chapters that the operating system regains control using timer interrupts every 1ms or so.