The next steps for userfaultfd()

The userfaultfd() system call allows user space to intervene in the handling of page faults. As Andrea Arcangeli and Mike Rapoport described in a 2017 Linux Storage, Filesystem, and Memory-Management Summit session dedicated to the subject, userfaultfd() was originally created to help with the live migration of virtual machines between physical hosts. It allows pages to be copied to the new host on demand, after the machine itself has been moved, leading to faster, more predictable migrations. Work on userfaultfd() is not finished, though; there are a number of other features that developers would like to add.

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