Method and apparatus for solving the stale data problem occurrin

Details Method and apparatus for solving the stale data problem occurrin Method and apparatus for solving the stale data problem occurrin

1997-01-29

1998-06-02

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

711202, 711203, 711210, 711118, 711142, G06F 1200, G06F 1300

Patent

active

057617228

ABSTRACT:
Methods and apparatus for using a store allocate policy to eliminate the stale data problem in a direct mapped, write-through virtual data cache. A hardware mechanism provided by the present invention, ensures that a single cache location associated with more than one virtual address does not become stale with respect to the main memory. By using a store allocate policy along with a write-through virtual cache, each time a store miss occurs, the data cache location for which the store miss occurred will be updated with new data brought back from the main memory along with a new cache tag. The store allocate policy for a write-through virtual data cache is implemented by a data cache controller. Thus, using this cache policy, the cache is updated along with the main memory even after a store miss. Furthermore, since not more than one virtual address may exist at any one time in the cache, it is ensured that a virtual address that is found in the cache will always contain the most updated data, hence overcoming the stale data problem.

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