Xen 4.12 release planning

[Juergen Gross <jgross@suse.com>]

Its time to plan the Xen 4.12 release dates.

There have been concerns with the schedule of 6 months between releases,
as this scheme is leading to too many supported versions of Xen at a
time. The needed resources to backport bug fixes and security fixes as
well as doing the tests for all those releases are a limiting factor to
push out the current main release as well as point releases on time.

After some discussions at the Xen developer summit, on xen-devel and
between the committers a slightly longer release cycle of 8 or 9 months
was suggested.

With 18 months of full support and 36 months of security support the
number of concurrent supported releases will be the same with either 8
or 9 months release cycles, so I have chosen an 8 month cycle for now.
Having only 3 possible times in the year for a release will make it
easier to avoid major holiday seasons.

In case there is no objection I'm planning Xen 4.12 with:

* Last posting date: December 14th, 2018
* Hard code freeze: January 11th, 2019
* Release: March 7th, 2019

Release of Xen 4.13 would then be early November 2019, 4.14 at early
July 2020.


Juergen

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