[an error occurred while processing this directive]

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.

[an error occurred while processing this directive]