kGraft — live kernel patching from SUSE

Posted Feb 4, 2014 8:56 UTC (Tue) by pbonzini (subscriber, #60935)
In reply to: kGraft — live kernel patching from SUSE by joyuh
Parent article: kGraft — live kernel patching from SUSE

That doesn't help with upgrading the kernel inside the VM.

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kGraft — live kernel patching from SUSE

Posted Feb 4, 2014 9:54 UTC (Tue) by dgm (subscriber, #49227) [Link] (3 responses)

You could use something like LinuxPMI or OpenMOSIX to migrate processes to the new kernel.

In fact, an alternative method to update the kernel would be to boot a second kernel and migrate processes to it using this mechanism.

Maybe one day.

kGraft — live kernel patching from SUSE

Posted Feb 4, 2014 13:37 UTC (Tue) by ledow (guest, #11753) [Link] (2 responses)

So long as you don't mind using 2.6 kernels and/or not having 9 things that a process could do that might stop it migrating (such as using I/O directly, having a memory-mapped file, etc.).

There's plenty of reasons that something like ksplice would be superior under certain workloads than trying to revive a (dead) concept / software project.

kGraft — live kernel patching from SUSE

Posted Feb 4, 2014 22:11 UTC (Tue) by dgm (subscriber, #49227) [Link]

There are hurdles to doing it right now, but no fatal flaws in the concept. ksplice may be "superior under certain workloads", but process migration is a good design idea that will be implemented anyway on the long term.

kGraft — live kernel patching from SUSE

Posted Feb 6, 2014 17:54 UTC (Thu) by cov (guest, #84351) [Link]

CRIU can do this and is very much alive.