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School of Computer Science & Engineering
University of New South Wales
Advanced Operating Systems
COMP9242 2002/S2
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03-cache
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Cache replacement policy
Cache write (update) policy
Treatment of store operations:
write back:
Stores update cache only,
memory updated when dirty line is replaced (flushed).
Memory is inconsistent with cache.
write through:
Stores update cache
and
memory immediately.
Memory is always consistent with cache.
On store to a line not presently in cache, use:
write allocate:
allocate a cache line to the data and store,
no allocate:
store to memory and bypass cache.
Usual combinations:
write-back & write-allocate,
write-through & no-allocate.
Gernot Heiser 2002-08-15
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