Re: CIP Kernel release cadence

Chris Paterson

Hello Agustin,

Thank you for your feedback, apologies for the delayed response.

From: Agustin Benito Bethencourt [mailto:agustin.benito@...]
Sent: 20 June 2017 18:06

Hi Chris,

I think I mentioned before some of the below arguments when this topic
was risen months ago. It is a good time to publish them here.

On 20/06/17 17:18, Ben Hutchings wrote:
On Tue, 2017-06-20 at 09:12 +0000, Chris Paterson wrote:
Hello Ben,

Do you have a plan for when future releases of the CIP Kernel will be

It would be good to have a fixed release cadence or roadmap, so
people using the Kernel can plan their activities accordingly.
I expect to release about every month, and whenever there's an urgent
security update (which there will be soon, for the "stack clash" issue).
I would like to keep flexibility here, that is, do not tight ourselves to releases
yet for a variety of reasons. These are the main ones I can think of right now:

* We are in an LTS phase. Defining a cadence at this point might reinforce the
idea that our kernel maintenance process is somehow different than LTS
when, except for a few packages, it is not yet. That was intentional.

* I would like to be able to consistently test the kernel, even with a single
test, before claiming to make releases, that is, before making a public
commitment on any delivery process. The expectations can be higher that
we can commit to.

* We do not know at this point what the maintenance cycle is going to be
from the kernel community. I am not suggesting that we have to follow it,
but before defining our cadence, I would have a clear idea about what
upstream will do.

* A kernel release for SLTS has severe implications in other areas, like the
testing tools, testing results, tests, etc. We need also to freeze/store/release
them, together with the build instructions, metadata, artifacts, source
code.... In other words, we need to define what "a release" means for CIP
and how much effort requires.
This is a good point. I guess I was referring to rebasing the CIP Kernel itself to the latest LTS tag, and when this would be done. E.g. LTS tag + x weeks?

* With the above and the fact that we are starting to put effort in -RT, I
wonder if we will talk about releasing the CIP kernel or we will talk about
releasing the CIP platform (assuming that at the beginning the kernel is the
main bit).
I think that the CIP Kernel could/should be updated constantly, like LTS is now.

Periodically a complete 'CIP platform' release should be made. I think this should be done to a schedule so that users of the CIP project can plan their activities accordingly.

Defining a release today might play against us in a year or two.

Once this said, if Members require at this point a cadence, we will provide
one but I think that sticking to LTS cycle until Feb'18 and assuming that we will
catch up every 4-8 weeks is the way to go. Once the 4.4 maintainer is
published, let's talk to him/her and take decisions.

Is there a specific reason why you need a cadence now beyond what LTS
provides? I am trying to understand the details in order to think about a
solution for Renesas compatible with the above.
Is there an actual release cycle for LTS? As far as I can see, new releases are made randomly.

Kind regards, Chris

Best Regards

Agustin Benito Bethencourt
Principal Consultant - FOSS at Codethink agustin.benito@...

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