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    SubjectRe: [PATCH RFC 04/15] KVM: Implement ring-based dirty memory tracking
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    On 10/12/19 14:25, Michael S. Tsirkin wrote:
    >> There is no new infrastructure to track the dirty pages---it's just a
    >> different way to pass them to userspace.
    > Did you guys consider using one of the virtio ring formats?
    > Maybe reusing vhost code?

    There are no used/available entries here, it's unidirectional
    (kernel->user).

    > If you did and it's not a good fit, this is something good to mention
    > in the commit log.
    >
    > I also wonder about performance numbers - any data here?

    Yes some numbers would be useful. Note however that the improvement is
    asymptotical, O(#dirtied pages) vs O(#total pages) so it may differ
    depending on the workload.

    Paolo

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