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Explore a KVM Forum presentation on UserfaultFD-based memory overcommitment for Linux virtualization environments. Learn about the limitations of current memory overcommitment techniques like host-based swapping and ballooning, and discover a proposed solution using an external memory manager leveraging UserfaultFD. Understand how this approach can improve VM performance, reduce live migration times, and enable future optimizations. Examine the design and implementation of a prototype system, its interoperation with QEMU, and performance improvements on various VM workloads. Gain insights into potential tradeoffs and areas for future enhancement in VM memory management.
