| 摘要 |
In a data processing system having a buffer storage and operated in a virtual storage system, storage keys including reference bits are retained in a storage key memory one for each predetermined unit of real storage, and reference bits are retained in a reference bit memory one for each predetermined unit of the real storage. Whenever the real storage is referred, the corresponding reference bit of the storage key memory is set, and whenever the buffer storage is referred, the corresponding reference bit of the reference bit memory is set. The reference bit of the storage key memory and the reference bit of the reference bit memory are ORed to produce a true reference bit.
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