Backports to jdk11u and jdk17u

[Ludovic Henry]

> However there is one big difference between general jdk17u and riscv
secific one: while jdk17u accepts only bug fixes and minor perf
improvements, the riscv-port-jdk17u will have to accept larger patches: as
risc-v port is far from being perfect so far, performance-wise is worse
than arm64 port.

I expect to initiate the backport in a dedicated openjdk/riscv-port-jdk17u
repository for exactly that. Until the riscv port is considered very stable
and performant, we likely want to keep it in a separate repository. When
stable, we can work with the relevant maintainers of jdk8u, jdk11u and
jdk17u for possible integrations.

> In fact, there were some discussions before on the list about the
backporting work [1].

I missed this one, thanks for pointing it out.

> I'm Xiang Zhang from the Institute of Software, Chinese Academy of
Sciences. I'm backporting jdk8u for RISC-V support. Here is my development
repository:
> https://github.com/zhangxiang-plct/jdk8u

If there is a riscv-port-jdk8u project, would you be interested to
contribute there directly?

In the meantime, I'll contact skara-dev to figure out what it would take to
create the riscv-port-jdk11u and riscv-port-jdk17u repositories.

Thanks,
Ludovic


On Mon, Jan 16, 2023 at 2:33 PM 章翔 <zhangxiang at iscas.ac.cn> wrote:

> Hello,
> I'm Xiang Zhang from the Institute of Software, Chinese Academy of
> Sciences. I'm backporting jdk8u for RISC-V support. Here is my development
> repository:
> https://github.com/zhangxiang-plct/jdk8u
> The current branch for template interpreter backporting is:
> https://github.com/zhangxiang-plct/jdk8u/tree/Fix_javac-temp
> As far as the current progress is concerned, the interpreter has been
> successfully ported.
> For example, I can successfully run "Hello World" under -Xint.
> I am currently testing benchmark workloads like dacapo and SPECjvm2008.
> My next step is to backport C1&C2 and I'm debugging related code for
> porting C1&C2.
>
> Thank you,
> Xiang Zhang
>
>
> > -----原始邮件-----
> > 发件人: yangfei at iscas.ac.cn
> > 发送时间: 2023-01-16 19:31:29 (星期一)
> > 收件人: "Ludovic Henry" <ludovic at rivosinc.com>
> > 抄送: riscv-port-dev at openjdk.org, yadonn.wang at huawei.com,
> zhangxiang at iscas.ac.cn
> > 主题: Re: Backports to jdk11u and jdk17u
> >
> > Hi,
> >
> > In fact, there were some discussions before on the list about the
> backporting work [1].
> > AFAIK, developers from Huawei already have workable versions of
> jdk11u & jdk17u on Linux/RISCV platform.
> > So I guess the rest of the work should be upstreaming. I think Yadong
> Wang from Huawei should have more details about that?
> >
> > Regarding backports to jdk8u, I also wonder whether users are
> interested to deploy jdk8u on riscv.
> > Xiang Zhang from ISCAS (Institute of Software, Chinese Academy of
> Sciences) is currently working on backporting to jdk8u
> > and has achieved some progress. But let me try to get the people
> involved in this discussion and see.
> >
> > Thanks,
> > Fei
> >
> > [1]
> https://mail.openjdk.org/pipermail/jdk-updates-dev/2022-May/014391.html
> >
> >
> > -----Original Messages-----
> > From:"Ludovic Henry" <ludovic at rivosinc.com>
> > Sent Time:2023-01-16 18:04:22 (Monday)
> > To: riscv-port-dev at openjdk.org
> > Cc:
> > Subject: Backports to jdk11u and jdk17u
> >
> > Hello,
> >   As we are seeing more and more adoption of RISC-V, there is a
> growing need for users to have access to more versions of Java available on
> RISC-V. Many organizations are still using Java 11 and Java 17 in
> production and it would be great to have RISC-V support available for them
> too. This would allow them to take advantage of the benefits that RISC-V
> offers by making their codebase more portable.
> >
> >
> >   Taking a similar approach to AArch64 backports to JDK8u [1], we
> would want to create the openjdk/riscv-port-jdk11u and
> openjdk/riscv-port-jdk17u repositories on GitHub. Additionally, we can work
> with the maintainers of the JDK 11u [2] and JDK 17u [3] projects to ensure
> there is a possible path to getting it merged.
> >
> >   Some questions which I'm not sure about yet:
> >   - Is there a need to backport to JDK 8u?
> >   - What is the engineering cost of the divergence between JDK8u and
> JDK head for the backporting effort?
> >
> >   Looking forward to your feedback,
> >
> >   Thank you,
> >   Ludovic
> >
> >   [1] https://hg.openjdk.java.net/aarch64-port/jdk8u
> >   [2]
> https://wiki.openjdk.org/display/JDKUpdates/JDK11u#JDK11u-maintainersMaintainers
>
> >   [3]
> https://wiki.openjdk.org/display/JDKUpdates/JDK+17u#JDK17u-maintainers
> &gt
> <https://wiki.openjdk.org/display/JDKUpdates/JDK+17u#JDK17u-maintainers&gt>;
>
> >
> > </ludovic at rivosinc.com>
> </ludovic at rivosinc.com>
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