On Mon, Feb 09, 2015 at 11:31:12AM -0600, Josh Poimboeuf wrote: > This patch set implements a livepatch consistency model, targeted for 3.21. > Now that we have a solid livepatch code base, this is the biggest remaining > missing piece. > > This code stems from the design proposal made by Vojtech [1] in November. It > makes live patching safer in general. Specifically, it allows you to apply > patches which change function prototypes. It also lays the groundwork for > future code changes which will enable data and data semantic changes. > > It's basically a hybrid of kpatch and kGraft, combining kpatch's backtrace > checking with kGraft's per-task consistency. When patching, tasks are > carefully transitioned from the old universe to the new universe. A task can > only be switched to the new universe if it's not using a function that is to be > patched or unpatched. After all tasks have moved to the new universe, the > patching process is complete. [...] Just an update on the status of this RFC. Thanks to everybody for all the useful comments. I plan to incorporate the resulting changes in an eventual v2 of this patch set. But, as Peter and Ingo have pointed out, stack traces are indeed unreliable. I have some ideas about how to improve them, coming soon in another RFC, which will be a prerequisite for this patch set. -- Josh -- To unsubscribe from this list: send the line "unsubscribe live-patching" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
