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Userfaultfd (edit)

Revision as of 11:04, 7 May 2017

58 bytes added , 11:04, 7 May 2017

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Add link to userfaultfd man2 page

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== Background ==

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The userfaultfd mechanism is designed to allow user-space paging. Its initial implementation merged in Linux 4.3 was designed for KVM/QEMU use-case and lacked some functionality necessary for CRIU. In Linux 4.11 the userfaultfd was extended with so-called "non-cooperative" mode, that allows, at least in theory, lazy (or post-copy) restore in CRIU.

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The [http://man7.org/linux/man-pages/man2/userfaultfd.2.html userfaultfd] mechanism is designed to allow user-space paging. Its initial implementation merged in Linux 4.3 was designed for KVM/QEMU use-case and lacked some functionality necessary for CRIU. In Linux 4.11 the userfaultfd was extended with so-called "non-cooperative" mode, that allows, at least in theory, lazy (or post-copy) restore in CRIU.

== Concepts ==

Rppt

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