Re: [RFC PATCH 6/9] livepatch: create per-task consistency model
From: Jiri Kosina
Date: Thu Feb 12 2015 - 07:42:09 EST
On Thu, 12 Feb 2015, Peter Zijlstra wrote:
> > Well, the fact indisputable fact is that there is a demand for this. It's
> > not about one machine, it's about scheduling dowtimes of datacentres.
> The changelog says:
> > ... A patch can remain in the
> > transition state indefinitely, if any of the tasks are stuck in the
> > previous universe.
> Therefore there is no scheduling anything. Without timeliness guarantees
> you can't make a schedule.
> Might as well just reboot, at least that's fairly well guaranteed to
All running (reasonably alive) tasks will be running patched code though.
You can't just claim complete victory (and get ready for accepting another
patch, etc) if there is a long-time sleeper that hasn't been converted
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