On Wed, Mar 26, 2025 at 03:37:50PM +0100, Miroslav Benes wrote: > If I remember correctly, we had something like this in the old kGraft > implementation of the live patching (SUSE way). We exactly had a hook > somewhere in the kthread freezing code. This looks much cleaner and as far > as I know the fridge went through improvements recently.
Yeah, I rewrote it a while ago :-) > Peter, so that I understand it correctly... we would rely on all kthreads > becoming freezable eventually so that both suspend and livepatch benefit. > Is that what you meant by the above? Well, IIRC (its been a while already) all kthreads should have a FREEZABLE already. Things like suspend-to-idle don't hit the hotplug path at all anymore and everything must freeze, otherwise they fail. I was more meaning the time-to-freeze; if some kthreads take a long time to freeze/patch then this would want improving on both ends.
