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Virtual Event | September 15-16, 2021
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Wednesday, September 15 • 14:05 - 14:30
Background Snapshots in QEMU: Towards Asynchronous Revert - Denis Lunev, Virtuozzo

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Background snapshots is a new feature in QEMU-6.0 designed to allow making snapshots on a live VM without need for dirty page tracking. It makes possible to capture machine state at the time the snapshot operation was initiated while keeping VM running. However making snapshot loading asynchronous is not a trivial task. This talk covers some technical complications that need to be resolved: - Container for snapshot data, how to address RAM pages? - Open-coded migration handlers in QEMU, can we re-use them? - Write buffering, is writeback cache a good choice? - Making revert really live, what's good tradeoff between speed and fault-in latency? - How to split snapshot loading into stages? Is it enough to have precopy and postcopy?


Denis Lunev

Team Lead, Virtuozzo
Denis Lunev is working in Virtuozzo around 20 years dealing with various aspects of virtualization, both in virtual machine and container worlds. Right now is working on QEMU optimizations.

Wednesday September 15, 2021 14:05 - 14:30 UTC
  KVM Track 2
  • Presentation Slides Attached Yes