Learn about QEMU postcopy preemption, a performance feature for speeding up page request handling during postcopy migration, in this 29-minute conference talk by Peter Xu from Red Hat. Explore the background of postcopy migration, its comparison to precopy solutions, and how postcopy preemption addresses limitations by providing a dedicated migration channel for urgent pages and allowing interruptions during huge page transfers. Gain insights into potential enhancements for postcopy, particularly regarding hugetlbfs pages and mapping with different granularities. Examine performance numbers and latency distributions to understand the impact of this new feature on live migration processes.