userfaultfd and userspace page fault handlingUserfaultfd is a Linux mechanism, available since kernel 4.3, with additional event features like non-cooperative mode and fork/remap/remove tracking added in 4.11, that lets a userspace thread intercept and handle page faults. Instead of the kernel resolving a missing page on its own by allocating a zero page or reading from a file, the kernel delivers a fault event to a file descriptor, and a userspace handler resolves it by providing data for the faulting page.
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