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Explore the development and implementation of PAGEMAP_SCAN IOCTL for Windows syscalls translation in this Linux Plumbers Conference talk. Dive into the evolution of write-tracking state management in the Linux kernel, from the initial use of soft-dirty PTE flags to the introduction of new Userfaultfd features. Learn how PAGEMAP_SCAN IOCTL enables efficient filtering of PTE bit information and atomic get-and-clear operations for write-tracking states. Discover the benefits for CRIU, allowing pre-dumping of process memory without freezing. Examine current implementation details, use cases, and benchmarks of this IOCTL, currently at version 33. Gain insights into ongoing efforts to advance patches and expand the user base for this interface, which aims to bridge the gap between Windows and Linux system calls for memory management.
