Effect of priority on swapping

Previously, processes were selected for swapping in and out based primarily on their scheduling priority. Now, swapping out is based on a combination of factors:

• the length of time in memory since process creation or last swap-in where greater time results in higher preference

• the resident set size (rss) of the process where the larger rss results in higher preference

• the minimum duration for which all LWPs in the process have been idle, stopped, or uninterruptably blocked where greater duration results in increased preference

• the maximum scheduling priority of all LWPs within a process where higher priority results in greater preference

• the length of time the process has been swapped-out where a greater time results in higher preference

• the rss of the process at the time of the last swap-out where the larger rss results in reduced preference

• the minimum duration for which the LWPs in the process have been idle, stopped, or uninterruptably blocked where greater duration results in increased preference