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Conventional virtual memory (VM) frameworks enable a virtual address toflexibly map to any physical address. This flexibility necessitates large datastructures to store virtual-to-physical mappings, which leads to high addresstranslation latency and large translation-induced interference in the memoryhierarchy. On the other hand, restricting the address mapping so that a virtualaddress can only map to a specific set of physical addresses can significantlyreduce address translation overheads by using compact and efficient translationstructures. However, restricting the address mapping flexibility across theentire main memory severely limits data sharing across different processes andincreases data accesses to the swap space of the storage device, even in thepresence of free memory. We propose Utopia, a new hybrid virtual-to-physicaladdress mapping scheme that allows both flexible and restrictive hash-basedaddress mapping schemes to harmoniously co-exist in the system. The key idea ofUtopia is to manage physical memory using two types of physical memorysegments: restrictive and flexible segments. A restrictive segment uses arestrictive, hash-based address mapping scheme that maps virtual addresses toonly a specific set of physical addresses and enables faster addresstranslation using compact translation structures. A flexible segment employsthe conventional fully-flexible address mapping scheme. By mapping data to arestrictive segment, Utopia enables faster address translation with lowertranslation-induced interference. Utopia improves performance by 24% in asingle-core system over the baseline system, whereas the best priorstate-of-the-art contiguity-aware translation scheme improves performance by13%.

Utopia: Fast and Efficient Address Translation via Hybrid Restrictive & Flexible Virtual-to-Physical Address Mappings