In response, we present vMitosis – a system for explicit management of two-level page-tables, i.e., the guest and extended page-tables, on virtualized NUMA servers. vMitosis enables faster address translation by migrating and replicating page-tables. It supports two prevalent virtualization configurations: first, where the hypervisor exposes the NUMA architecture to the guest OS, and second, where such information is hidden from the guest OS. vMitosis is implemented in Linux/KVM, and our evaluation on a recent 1.5TiB 4-socket server shows that it effectively eliminates NUMA effects on 2D page-table walks, resulting in a speedup of 1.8−3.1× for Thin (single-socket) and 1.06 − 1.6× for Wide (multi-socket) workloads.
Ashish Panwar, Reto Achermann, Arkaprava Basu, Abhishek Bhattacharjee, K. Gopinath, Jayneel Gandhi, “Fast Local Page-Tables for Virtualized NUMA Servers with vMitosis,” ASPLOS 2021.
Ashish Panwar, Sorav Bansal, K. Gopinath, “HawkEye: Efficient Fine-grained OS Support for Huge Pages,” ASPLOS 2019