Virtual Caches

• Send virtual address to cache. Called Virtually Addressed Cache or just Virtual Cache vs. Physical Cache or Real Cache

• Avoid address translation before accessing cache

  • faster hit time to cache

• Context Switches?

  • Just like the TLB (flush or pid)
  • Cost is time to flush + “compulsory” misses from empty cache
  • Add process identifier tag that identifies process as well as address within process: can’t get a hit if wrong process

• I/O must interact with cache

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