Of the available page frames, the page frame database links together those that are in the same state, thus creating five separate homogeneous lists. Whenever the number of pages in the zeroed, free, and standby lists reaches a preset minimum, the
modified page writer process is activated to write the contents of the modified pages to disk and link them to the standby list. On the other hand, if the modified page list becomes too short, the VM Manager shrinks each process’s working set to its minimum working set size and adds the newly freed pages to the modified or standby lists to be reused.