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Zero-Copy, Minimal-Blackout Virtual Machine Migrations Using Disaggregated Shared Memory

Authors Andreas Grapentin , Felix Eberhardt, Tobias Zagorni, Andreas Polze, Michele Gazzetti , Christian Pinto

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Author Details

Andreas Grapentin
  • Operating Systems and Middleware Group, Hasso Plattner Institute, University of Potsdam, Germany
Felix Eberhardt
  • Operating Systems and Middleware Group, Hasso Plattner Institute, University of Potsdam, Germany
Tobias Zagorni
  • Operating Systems and Middleware Group, Hasso Plattner Institute, University of Potsdam, Germany
Andreas Polze
  • Operating Systems and Middleware Group, Hasso Plattner Institute, University of Potsdam, Germany
Michele Gazzetti
  • IBM Research Europe, Dublin, Ireland
Christian Pinto
  • IBM Research Europe, Dublin, Ireland

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Andreas Grapentin, Felix Eberhardt, Tobias Zagorni, Andreas Polze, Michele Gazzetti, and Christian Pinto. Zero-Copy, Minimal-Blackout Virtual Machine Migrations Using Disaggregated Shared Memory. In 15th Workshop on Parallel Programming and Run-Time Management Techniques for Many-Core Architectures and 13th Workshop on Design Tools and Architectures for Multicore Embedded Computing Platforms (PARMA-DITAM 2024). Open Access Series in Informatics (OASIcs), Volume 116, pp. 3:1-3:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024) https://doi.org/10.4230/OASIcs.PARMA-DITAM.2024.3

Abstract

We propose a new live-migration paradigm for virtual machines called zero-copy migration. By making the working set of the virtual machine available on the destination host through transparently byte-addressable disaggregated memory, we remove the need for a pre-copy phase while simultaneously reducing the performance impact of the post-copy phase. We describe an open-source implementation of the proposed paradigm based on QEMU-KVM and libvirt, and we evaluate the efficiency of the approach with a deployment on a functional hardware prototype of a memory disaggregation system realized using ThymesisFlow. Using a series of configurable benchmarks, we show that the lead time and blackout time of the migration are equal to best-case scenarios of traditional pre-copy, post-copy and hybrid approaches. Key performance metrics from the perspective of applications running in the virtual machine, such as memory latency and throughput, are improved by up to three orders of magnitude, increasing both flexibility and responsiveness of live-migrations in the datacenter.

Subject Classification

ACM Subject Classification
  • Hardware → Memory and dense storage
  • Computer systems organization → Cloud computing
  • Software and its engineering → Virtual machines
  • Software and its engineering → Distributed memory
  • Software and its engineering → Cloud computing
  • Information systems → Data centers
  • Information systems → Computing platforms
Keywords
  • disaggregation
  • disaggregated memory
  • vm live migration
  • thymesisflow
  • power9
  • opencapi
  • performance evaluation
  • zero copy

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