Question

Explain why address space identifiers (ASIDs) are used.

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When the TLB attempts to resolve virtual page numbers, it ensures that the Address Space Identifiers (ASIDs)\text{\color{#4257b2}Address Space Identifiers (ASIDs)} for the currently running process matches the ASID associated with the virtual page. If the ASIDs do not match, the attempt is treated as a TLB miss.

So ASIDs are used to provide address space protection in the TLB as well as supporting TLB entries for several different processes at the same time.

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