Messages in this thread |  | | Date | Thu, 12 Feb 2015 13:25:14 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: [RFC PATCH 6/9] livepatch: create per-task consistency model |
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On Thu, 12 Feb 2015, Peter Zijlstra wrote:
> Its not at all clear how all this would work to me. And I'm not > motivated enough to go try and reverse engineer your patch; IMO > livepatching is utter fail. > > If your infrastructure relies on the uptime of a single machine you've > lost already.
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.
But if this needs to be discussed, it should be done outside of this thread I guess.
> FWIW, the barriers in klp_update_task_universe() and > klp_set_universe_goal() look like complete crack, and their comments are > seriously deficient.
These particular barriers seem correct to me; you basically need to make sure that whenever a thread with TIF_KLP_NEED_UPDATE goes through do_notify_resume(), it sees proper universe number to be converted to.
-- Jiri Kosina SUSE Labs
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