[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Xen 4.12 release planning
On Wed, Jul 25, 2018 at 10:22 AM, Juergen Gross <jgross@xxxxxxxx> wrote: > On 25/07/18 10:19, Andrew Cooper wrote: >> On 25/07/2018 09:15, Julien Grall wrote: >>> Hi Juergen, >>> >>> On 25/07/18 08:19, Juergen Gross wrote: >>>> 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 >>> >>> In general, you would expect western people to slow down during >>> Christmas period and have to deal with a pile of e-mail just after New >>> Year. So I think, this is not very convenient period for a code freeze. >>> >>> I usually take more holidays around Christmas and New Year. For this >>> year, I will be on holidays from 21st December until the 13th January. >>> This basically means my cut off for Arm patches will be 21st December >>> or potentially few days before to avoid having the likely last minute >>> rush. >> >> Given that we have decided to switch to a difference cadence, it would >> be prudent to work out when the best alignment of an 8-month cadence >> would be, rather than having it 8 months from now. If that means a >> one-off shorter or longer cycle for 4.12 then so be it. > > The general holiday seasons are: > > - Chinese new year (end of January ... mid of February), 2 weeks > - Eastern (end of March ... end of April), only a weak dependency? > - summer (August?), second half of July and first half of September as > a weak dependency > - Christmas (end of December ... start of January), adding one week as > a weak dependency > > We don't like the planned release to be in or just before a holiday > season. The period between last posting date and freeze should last > 2 weeks, the freeze period should last 6 weeks. > > In the diagram below I have used a 'X' for a major holiday season and > a 'x' for a weak dependency. The lines below are possible release date > variants just shifted by a weak each to show all possibilities. > > Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec > Xx.XXXXX...xxxx...........xxXXXXx..............X holidays > ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR....... > .ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR...... > ..ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR..... > ...ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR.... > ....ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR... > .....ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR.. > ......ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR. > .......ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR > R.......ffFFFFFFR.......ffFFFFFFR.......ffFFFFFF > FR.......ffFFFFFFR.......ffFFFFFFR.......ffFFFFF > FFR.......ffFFFFFFR.......ffFFFFFFR.......ffFFFF > FFFR.......ffFFFFFFR.......ffFFFFFFR.......ffFFF > FFFFR.......ffFFFFFFR.......ffFFFFFFR.......ffFF > FFFFFR.......ffFFFFFFR.......ffFFFFFFR.......ffF > FFFFFFR.......ffFFFFFFR.......ffFFFFFFR.......ff > fFFFFFFR.......ffFFFFFFR.......ffFFFFFFR.......f > > We can rule out several variants with release dates just before or in a > holiday season: > > Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec > Xx.XXXXX...xxxx...........xxXXXXx..............X holidays > ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR....... > .ffFFFFFFR.......ffFFFFFFR.......ffFFFFFFR...... > > Best fit seems to be releasing in first half of March/July/November. The > main clash seems to be Chinese new year in the freeze period, but > avoiding that would mean we'd have to either move into Christmas or > Eastern, or to use a schedule with varying periods. > > Please remember that Chinese new year is only 2 weeks long (at varying > dates) so only 2 weeks of the freeze period are hit. Next year the > Chinese new year will be at February 5th. > > For my 4.12 plan I've added some extra weeks between last posting date > and release date to accommodate for the holiday seasons, resulting in > my suggestion. Thanks for the detailed analysis Juregen. This seems good to me. -George _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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