Runahead allocation protection (RAP)

Details Runahead allocation protection (RAP) Runahead allocation protection (RAP)

2005-10-18

2005-10-18

Padmanabhan, Mano (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S204000, C711S213000, C712S207000, C712S230000

Reexamination Certificate

active

06957304

ABSTRACT:
A method and apparatus are described for protecting cache lines allocated to a cache by a run-ahead prefetcher from premature eviction, preventing thrashing. The invention also prevents premature eviction of cache lines still in use, such as lines allocated by the run-ahead prefetcher but not yet referenced by normal execution. A protection bit indicates whether its associated cache line has protected status in the cache or whether it may be evicted.

REFERENCES:
patent: 5920889 (1999-07-01), Petrick et al.
patent: 5983324 (1999-11-01), Ukai et al.
Microsoft Computer Dictionary, 1999, Microsoft Press, Fourth Edition, p. 111.
Dundas, J., et al., “Improving Data Cache Performance by Pre-executing Instructions Under a Cache Miss”,Proceedings of the 1997 International Conference on Supercomputing, 68-75, (1997).

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