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The exponential growth of data has driven technology providers to develop newprotocols, such as cache coherent interconnects and memory semantic fabrics, tohelp users and facilities leverage advances in memory technologies to satisfythese growing memory and storage demands. Using these new protocols,fabric-attached memories (FAM) can be directly attached to a systeminterconnect and be easily integrated with a variety of processing elements(PEs). Moreover, systems that support FAM can be smoothly upgraded and allowmultiple PEs to share the FAM memory pools using well-defined protocols. Thesharing of FAM between PEs allows efficient data sharing, improves memoryutilization, reduces cost by allowing flexible integration of different PEs andmemory modules from several vendors, and makes it easier to upgrade the system.One promising use-case for FAMs is in High-Performance Compute (HPC) systems,where the underutilization of memory is a major challenge. However, adoptingFAMs in HPC systems brings new challenges. In addition to cost, flexibility,and efficiency, one particular problem that requires rethinking is virtualmemory support for security and performance. To address these challenges, thispaper presents decoupled access control and address translation (DeACT), anovel virtual memory implementation that supports HPC systems equipped withFAM. Compared to the state-of-the-art two-level translation approach, DeACTachieves speedup of up to 4.59x (1.8x on average) without compromisingsecurity.

DeACT: Architecture-Aware Virtual Memory Support for Fabric Attached Memory Systems