CPU protection

memory protection

file protection

all of these

meet prescribed time constraints

aim better resource sharing

aim better system utilization

aim low system overhead

the set of k future references that the operating system will make

the set of future references that the operating system will make in the next 'k' time units

the set of k reference with high frequency

the set of pages that have been referenced in the last k time units

3.0 ns

68.0 ns

68.5 ns

78.5 ns

round-robin

first-come-first-served

pre-emptive

random scheduling