Postcopy Preemption in QEMU - Improving Live Migration Performance

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.

OUTLINES
WHAT IS POSTCOPY?
WHAT IS POSTCOPY PREEMPTION?
LIVE MIGRATION (PRECOPY)
POSTCOPY LIMITATIONS
BACKGROUND PAGE FLUSH
CHANNEL SEPARATION
HUGE PAGE GRANULE
HUGE PAGE PREEMPTIONS
MIGRATION THREAD ITSELF!
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PERFORMANCE NUMBERS
DISTRIBUTIONS OF LATENCIES