OS Load Control
It can happen that the system thrases even with the best page replacement algorithm and optimal global allocation of page frames to processes.
System thrasing can also be expected when the combined working sets of all the processes exceed the memory capacity.
One symptom of this situation is that the page fault frequently (PFF) algorithm indicates that some processes need more memory but no processes need less memory. In this case, there is no any way to give some extra memory to those processes that are needing it without hurting other processes.
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