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Virtualization provides benefits for many workloads, but the overheads of virtualizing memory are still high. The cost comes from managing two levels of address translation--one in the guest virtual machine (VM) and the other in the host virtual machine monitor (VMM)--with either nested or shadow paging. This article introduces agile paging, which combines the best of both nested and shadow paging...
Virtualization provides benefits for many workloads, but the overheads of virtualizing memory are not universally low. The cost comes from managing two levels of address translation -- one in the guest virtual machine (VM) and the other in the host virtual machine monitor (VMM) -- with either nested or shadow paging. Nested paging directly performs a two-level page walk that makes TLB misses slower...
Modern workloads suffer high execution-time overhead due to page-based virtual memory. The authors introduce range translations that map arbitrary-sized virtual memory ranges to contiguous physical memory pages while retaining the flexibility of paging. A range translation reduces address translation to a range lookup that delivers near zero virtual memory overhead.
Virtualization provides value for many workloads, but its cost rises for workloads with poor memory access locality. This overhead comes from translation look aside buffer (TLB) misses where the hardware performs a 2D page walk (up to 24 memory references on x86-64) rather than a native TLB miss (up to only 4 memory references). The first dimension translates guest virtual addresses to guest physical...
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