Project proposal: s390x port

[Volker Simonis]

Hi,

just a quick check: do I have the approval of the Porters Group to put
forward this
proposal for a vote?

Thank you and best regards,
Volker


On Mon, May 9, 2016 at 2:51 PM, David Edelsohn <dje.gcc at gmail.com> wrote:
> Hi, Volker
>
> This is a pleasant surprise.  If SAP has a complete OpenJDK port for
> s390x and are willing to contribute it, that would be great!  Please
> inquire about that option.  There is no reason to duplicate effort and
> re-implement the entire port.
>
> If you can make fast enough progress on the approvals, could this be
> contributed for JDK 9?
>
> Again, thanks for the alerting us to this port and for the offer to
> contribute it.
>
> Thanks, David
>
> On Mon, May 9, 2016 at 8:19 AM, Volker Simonis <volker.simonis at gmail.com> wrote:
>> Hi everybody,
>>
>> my name is Volker Simonis and I'm the project lead of the PowerPC/AIX
>> porting project. I'm writing from my Google mail account for historic
>> reasons (I've been an OpenJDK contributor before SAP was) but I think
>> it is no secret that I'm working for SAP :)
>>
>> We have a complete (i.e. template interpreter, C1 and C2 JIT) and
>> certified (Java 4-8) s390x port which is used in production since
>> years. It is based on the our commercially licensed HotSpot sources
>> but the s390x port is completely written and owned by SAP.
>>
>> We haven't thought about contributing it to the OpenJDK until now
>> because we didn't expect any interest from the community :)
>>
>> I can not make any commitments now, but if there really is any
>> interest in such a port (and this email thread indicates that there is
>> :) we may reconsider our decision.
>>
>> From a technical point of view and with the experience we gained with
>> the PowerPC/AIX Port I think the s390x port could be integrated into
>> the OpenJDK quite smoothly (there are considerably less shared changes
>> required compared to the PowerPC/AIX port).
>>
>> So if this sounds reasonable, I could begin to get the internal
>> approvals so we can get the project started.
>>
>> Regards,
>> Volker
>>
>> On Fri, May 6, 2016 at 3:24 PM, David Edelsohn <dje.gcc at gmail.com> wrote:
>>> On Fri, May 6, 2016 at 7:25 AM, dalibor topic <dalibor.topic at oracle.com> wrote:
>>>> Hi David,
>>>>
>>>> thank you for your proposal. As usual, I have a few questions in order to
>>>> better understand the Project being proposed.
>>>>
>>>> On 05.05.2016 14:48, David Edelsohn wrote:
>>>>>
>>>>> [Sorry if this is a duplicate. An earlier message is awaiting moderation.]
>>>>>
>>>>> I would like to propose the creation of a new project to port OpenJDK
>>>>> to IBM z/Architecture (s390x).
>>>>
>>>>
>>>> I noticed that you sent the proposal from a gmail address, while a person of
>>>> the same name seems to work [0] at IBM, who happen to produce s390x
>>>> architecture machines. Do you happen to be the same person by chance? If so,
>>>> would you be contributing to this Project on behalf of IBM, or on your own
>>>> behalf?
>>>
>>> Hi, Dalibor
>>>
>>> Yes, I am the same person.  I prefer this email address for
>>> discussions with Open Source projects. I sent the feature request from
>>> my official IBM email address to confirm that this request originates
>>> from IBM and that IBM supports this effort.
>>>
>>> IBM itself will not contribute the port.  I will not contribute this
>>> port myself -- neither as an IBM employee nor on my own behalf.
>>>
>>>>
>>>> Could you elaborate a bit on the nature of the development work:
>>>>
>>>>  * Who would be in the initial set of the Project's Committers?
>>>
>>> The port will be developed by Marcin Kościelnicki.
>>>
>>>>  * Would you have Reviewers on the Project?
>>>
>>> Yes, there will be IBMers who will assist with reviews of the proposed patches.
>>>
>>>>  * Would you be starting from scratch within the new OpenJDK Project, or are
>>>> you looking at bringing an already existing, internal port in?
>>>
>>> This is a new port starting from scratch.
>>>
>>>>  * In the latter case, does the code you'd like to contribute to the port
>>>> have any third party dependencies?
>>>
>>> N/A
>>>
>>>>  * In the former case, are you aware of the Open Mainframe Project, which
>>>> seems to intend to produce a JIT for OpenJDK, as well? [1]
>>>
>>> This proposal is in conjunction with the Open Mainframe Project TSC for OpenJDK.
>>>
>>>>  * Which JDK release would you plan to target initially?
>>>
>>> I believe that the goal is inclusion in OpenJDK 9. I welcome your
>>> advice and guidance about this issue.
>>>
>>>>
>>>>> The proposal is support for s390x z12 on LinuxONE (Linux on IBM z
>>>>> Systems).  The support would include the C++ interpreter, the template
>>>>> interpreter, and the C2 compiler.
>>>>
>>>>
>>>> OK. I assume that C1 is not something your port needs, or is it something
>>>> you'll consider for a later iteration?
>>>
>>> C1 is not needed.  We may consider it in the future, depending on
>>> market and/or customer requirements.
>>>
>>>>
>>>>> I have submitted an enhancement request that has been assigned review
>>>>> ID JI-9036871.  I am hoping that it will be assigned an official JIRA
>>>>> issue and allow OpenJDK Bug System access.
>>>>
>>>>
>>>> That issue is now https://bugs.openjdk.java.net/browse/JDK-8156104 . It's
>>>> also been marked as closed, as there is no need to submit issues to create
>>>> new Projects. The process is documented at
>>>> http://openjdk.java.net/projects/#new-project .
>>>>
>>>> When a new Project is created, its Project Lead, Committers, Reviewers and
>>>> Authors get write access to the JDK Bug System within their Project.
>>>
>>> Thanks.
>>>
>>> IBM has very successfully utilized bounties[2] to enable and optimize
>>> many Open Source packages on LinuxONE (and POWER).  We plan to
>>> continue with that methodology for this project with multiple feature
>>> requests in JIRA corresponding to different components / phases of the
>>> project to enable OpenJDK.
>>>
>>> Thanks for your help with the process to formally create this project.
>>> Your guidance is greatly appreciated.
>>>
>>> Thanks, David
>>>
>>> [2] https://www.bountysource.com/teams/ibm/bounties