ExtMem: Enabling Application-Aware Virtual Memory Management for Data-Intensive...
summary
ExtMem/XM is a user-space framework that replaces userfaultfd with an upcall-based fault handling path to remove IPC and serialization, lowering page-fault latency and scaling almost as well as the kernel for concurrent faults. It exposes observability hooks and a policy API so teams implement a custom eviction+prefetch policy or reimplement Linux policies — e.g., 2Q LRU in ~300 lines and a prefetcher in ~200 lines — and on PageRank with Twitter at 50% memory it runs about 2x slower than fully in-memory while outperforming stock Linux VM policies.
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