Frame choosing during storage constraint condition

摘要

A method for frame choosing in a computing system during a storage constraint condition is provided. The method includes calculating, with a processor, a use-grouped-threshold, comparing a number of available grouped frames to the calculated use-grouped-threshold, returning a decision to use a grouped frame in an event that the number of the available grouped frames exceeds the calculated use-grouped-threshold and returning a decision to use an above-the-bar frame in an event that the number of the available grouped frames is less than or equal to the calculated use-grouped-threshold.

主权项

1. A method for frame choosing in a computing system during a storage constraint condition, the method comprising:
calculating, with a processor, a use-quad-threshold as a sum of a number of reserved quad frames and a number of available above-the-bar frames; comparing a number of available grouped frames that are each provided as one of the quad frames and that comprise multiple contiguous 4k frames to the calculated use-quad-threshold; returning a decision to use a grouped frame in an event that the number of the available grouped frames exceeds the calculated use-quad-threshold; returning a decision to use an above-the-bar frame in an event that the number of the available grouped frames is less than or equal to the calculated use-quad-threshold; counting a number of grouped and above-the-bar frames in use; determining whether the number of the grouped and above-the-bar frames in use exceeds a threshold percentage of available frames, and taking an action in accordance with the determining, wherein the taking of the action comprises: making more grouped and above-the-bar frames available by moving program data to auxiliary storage by way of storage dumping; and recognizing that a queue of storage usages suited for the above-the-bar frames exists in a storage constraint condition, determining as a result of the recognizing that relative preciousness of the grouped and above-the-bar frames changes over time and accordingly increasing the threshold percentage to encourage the returning of decisions to use the above-the-bar frames.