Re: RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port [v2]
On Tue, 22 Mar 2022 12:08:01 GMT, Fei Yang wrote: >> make/autoconf/libraries.m4 line 152: >> >>> 150: fi >>> 151: >>> 152: # Programs which use C11 or C++11 atomics, like #include , >> >> Use of C++ atomics is not allowed in hotspot code base. See the style guide: >> https://github.com/openjdk/jdk/blob/master/doc/hotspot-style.md >> >> That said, I don't see any actual use of C++ atomics. ?? > > I think the old code comment here is a bit too general. It does not mean we > introduce any use of C++ atomics here. > The fact is that RISC-V only has word-sized atomics, it requries libatomic > where other common architectures do not [1]. > So atomic support would require explicit linking against -latomic on RISC-V. > Otherwise we got build errors like: New comment looks good - thanks for clarifying. - PR: https://git.openjdk.java.net/jdk/pull/6294
Re: RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port [v2]
On Tue, 22 Mar 2022 04:13:17 GMT, David Holmes wrote: >> Fei Yang has updated the pull request with a new target base due to a merge >> or a rebase. The incremental webrev excludes the unrelated changes brought >> in by the merge/rebase. The pull request contains two additional commits >> since the last revision: >> >> - Merge remote-tracking branch 'upstream/master' into JDK-8276799 >> - 8276799: Implementation of JEP 422: Linux/RISC-V Port > > make/autoconf/libraries.m4 line 152: > >> 150: fi >> 151: >> 152: # Programs which use C11 or C++11 atomics, like #include , > > Use of C++ atomics is not allowed in hotspot code base. See the style guide: > https://github.com/openjdk/jdk/blob/master/doc/hotspot-style.md > > That said, I don't see any actual use of C++ atomics. ?? I think the old code comment here is a bit too general. It does not mean we introduce any use of C++ atomics here. The fact is that RISC-V only has word-sized atomics, it requries libatomic where other common architectures do not [1]. So atomic support would require explicit linking against -latomic on RISC-V. Otherwise we got build errors like: - PR: https://git.openjdk.java.net/jdk/pull/6294
Re: RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port [v2]
On Tue, 22 Mar 2022 05:12:46 GMT, David Holmes wrote: > Hi, > > I've looked at everything that is not a RISC-V specific file, except for the > C1 changes as the compiler folk will need to approve those. > > Some copyrights will need updating to 2022 on the Oracle copyright line > please. Hi David, I have pushed one more commit updating the Oralce copyright line for existing files touched. Thanks for looking at this. - PR: https://git.openjdk.java.net/jdk/pull/6294
Re: RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port [v2]
On Tue, 22 Mar 2022 03:31:16 GMT, Fei Yang wrote:
>> This PR implements JEP 422: Linux/RISC-V Port [1].
>> The PR starts as a squashed merge of the
>> https://openjdk.java.net/projects/riscv-port branch.
>>
>> This has been tested with jtreg tier{1,2,3,4} and jcstress on HiFive
>> Unmatched board. Dacapo, SPECjbb2015 and SPECjvm2008 benchmark tests are
>> also carried out regularly. So it should be good enough to run most Java
>> programs.
>>
>> [1] https://openjdk.java.net/jeps/422
>
> Fei Yang has updated the pull request with a new target base due to a merge
> or a rebase. The incremental webrev excludes the unrelated changes brought in
> by the merge/rebase. The pull request contains two additional commits since
> the last revision:
>
> - Merge remote-tracking branch 'upstream/master' into JDK-8276799
> - 8276799: Implementation of JEP 422: Linux/RISC-V Port
> Build changes look good. I can't say anything about the rest of the code.
>
> /reviewers 3
Thanks again for looking at the build changes :-)
-
PR: https://git.openjdk.java.net/jdk/pull/6294
Re: RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port [v2]
On Tue, 22 Mar 2022 03:31:16 GMT, Fei Yang wrote:
>> This PR implements JEP 422: Linux/RISC-V Port [1].
>> The PR starts as a squashed merge of the
>> https://openjdk.java.net/projects/riscv-port branch.
>>
>> This has been tested with jtreg tier{1,2,3,4} and jcstress on HiFive
>> Unmatched board. Dacapo, SPECjbb2015 and SPECjvm2008 benchmark tests are
>> also carried out regularly. So it should be good enough to run most Java
>> programs.
>>
>> [1] https://openjdk.java.net/jeps/422
>
> Fei Yang has updated the pull request with a new target base due to a merge
> or a rebase. The incremental webrev excludes the unrelated changes brought in
> by the merge/rebase. The pull request contains two additional commits since
> the last revision:
>
> - Merge remote-tracking branch 'upstream/master' into JDK-8276799
> - 8276799: Implementation of JEP 422: Linux/RISC-V Port
Hi,
I've looked at everything that is not a RISC-V specific file, except for the C1
changes as the compiler folk will need to approve those.
Some copyrights will need updating to 2022 on the Oracle copyright line please.
I have flagged one issue in regard to C++ atomics - see below.
Thanks,
David
make/autoconf/libraries.m4 line 152:
> 150: fi
> 151:
> 152: # Programs which use C11 or C++11 atomics, like #include ,
Use of C++ atomics is not allowed in hotspot code base. See the style guide:
https://github.com/openjdk/jdk/blob/master/doc/hotspot-style.md
That said, I don't see any actual use of C++ atomics. ??
-
Marked as reviewed by dholmes (Reviewer).
PR: https://git.openjdk.java.net/jdk/pull/6294
Re: RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port [v2]
> This PR implements JEP 422: Linux/RISC-V Port [1].
> The PR starts as a squashed merge of the
> https://openjdk.java.net/projects/riscv-port branch.
>
> This has been tested with jtreg tier{1,2,3,4} and jcstress on HiFive
> Unmatched board. Dacapo, SPECjbb2015 and SPECjvm2008 benchmark tests are also
> carried out regularly. So it should be good enough to run most Java programs.
>
> [1] https://openjdk.java.net/jeps/422
Fei Yang has updated the pull request with a new target base due to a merge or
a rebase. The incremental webrev excludes the unrelated changes brought in by
the merge/rebase. The pull request contains two additional commits since the
last revision:
- Merge remote-tracking branch 'upstream/master' into JDK-8276799
- 8276799: Implementation of JEP 422: Linux/RISC-V Port
-
Changes:
- all: https://git.openjdk.java.net/jdk/pull/6294/files
- new: https://git.openjdk.java.net/jdk/pull/6294/files/33402035..a144cd20
Webrevs:
- full: https://webrevs.openjdk.java.net/?repo=jdk=6294=01
- incr: https://webrevs.openjdk.java.net/?repo=jdk=6294=00-01
Stats: 2517 lines in 698 files changed: 1371 ins; 865 del; 281 mod
Patch: https://git.openjdk.java.net/jdk/pull/6294.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/6294/head:pull/6294
PR: https://git.openjdk.java.net/jdk/pull/6294
