Name: State Persistence Over kexec - Mike Rapoport, Microsoft
Start: 2025-06-23T15:35:00-0600
End: 2025-06-23T16:15:00-0600

June 23 - 25, 2025
Denver, Colorado
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Note: The schedule is subject to change.

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Monday June 23, 2025 3:35pm - 4:15pm MDT

Bluebird Ballroom 2E

For long time kexec was a faster way to reboot a machine without incurring delays caused by firmware and bootloaders. However for many applications even a kexec reboot still means significant service degradation, like disruption of the running guests in virtualized environments and the need to rebuild in-memory caches for large databases.

We propose Kexec HandOver (KHO) mechanism that allows serialization and deserialization of kernel data as well as preserving arbitrary memory ranges across kexec.

In addition, KHO keeps physically contiguous memory regions that are guaranteed to not have any memory that KHO would preserve, but still can be used by the system. The kexeced kernel bootstraps itself using those regions and marks all handed over memory as in use. KHO users then can recover their state from the preserved data. This includes memory reservations, where the user can either discard or claim reservations.

Speakers

Mike Rapoport

Principal Software Engineer, Microsoft

Mike has lots of programming experience in different areas ranging from medical equipment to visual simulation, but most of all he likes hacking on Linux kernel and low level stuff. He started contributing to the Linux kernel while working on ARM and device drivers and then gradually... Read More →

Monday June 23, 2025 3:35pm - 4:15pm MDT
Bluebird Ballroom 2E

Linux

Audience Experience Level Advanced

Open Source Summit North America 2025

Mike Rapoport

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