How is priority of memory usage managed between 10 different apps using that kind of allocation policy? I have never seen Chrome starting to use much less memo

How is priority of memory usage managed between 10 different apps using that kind of allocation policy? I have never seen Chrome starting to use much less memory when memory pressure becomes high and I have been monitoring it many times. There is some GC like behavior releasing a small amount of memory from time to time, but nothing really significant when systems starts running out of avaliable physical memory.