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
