On Thu, 30 Nov 2023 02:36:43 +0000 SeongJae Park <sj@xxxxxxxxxx> wrote: > The core logic uses the below simple feedback loop algorithm to > calculate the next aggressiveness level of the scheme from the current > aggressiveness level and the current feedback (target_score and > current_score). It calculates the compensation for next aggressiveness > as a proportion of current aggressiveness and distance to the target > score. As a result, it arrives at the near-goal state in a short time > using big steps when it's far from the goal, but avoids making > unnecessarily radical changes that could turn out to be a bad decision > using small steps when its near to the goal. fwiw, the above is a "proportional controller". MGLRU has, in vmscan.c, a PID controller (proportional, integral, derivative). PID controllers have better accuracy (the integral feedback) and better stability (the derivative feedback). Generalizing MGLRU's PID controller might be somewhat challenging!
