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Friday, October 30 • 16:00 - 16:30
KVM Dirty Ring - A New Approach to Logging - Peter Xu, Red Hat

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In this talk, Peter will present a new kvm dirty logging interface which is called kvm dirty ring. This is a carry-over work from Lei Cao and Paolo Bonzini which started a few years ago. Instead of using dirty bitmaps to record dirty pages, kvm dirty ring records the dirty pages in the form of an array of guest PFNs, which are recorded in per-vcpu ring structures. The memory consumption of dirty logging itself will be heavily reduced, and the size of the dirty rings will be configurable (via QEMU command lines). More importantly, dirty ring gives us a chance to be able to collect and sync dirty pages in a totally different way that will be extremely friendly to COLO-like applications. However, kvm dirty ring is not a super weapon to cover every single scenario. Peter will also talk about different user scenarios and on how to choose the correct logging method.

avatar for Peter Xu

Peter Xu

Senior Software Engineer, Red Hat
Peter Xu works for Red Hat virtualization team. His major interests are QEMU/KVM and Linux memory management. Previously Peter Xu has represented topics on KVM forum regarding IOMMU emulations, VFIO and kvm dirty ring.

Friday October 30, 2020 16:00 - 16:30 GMT
KVM Theater
  KVM Track 1