[jdk11u-dev] RFR: 8253795: Implementation of JEP 391: macOS/AArch64 Port [v5]

[Andrew Haley]

On Tue, 14 Dec 2021 08:05:51 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

>> Initial version of JEP-391 backport to jdk11u.
>> Build system changes are mostly clean, except cds disabling part, it's copy&paste from aix part.
>> Things needing attention: os_bsd_aarch64.cpp and W^X transitions.
>> serviceability agent is mostly clean.
>> This passed GHA_tier1 testing.
>> Full regression testing is running now on Azul's infra, will report/update PR when done.
>> **Update: TCK passed**
>> Sharing this PR slightly earlier to let other interested parties to run the tests too.
>> Example of cross-building on intel mac (needs Xcode12/13):
>> sh configure --with-boot-jdk=/Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home/ --with-build-jdk=/Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home/ --disable-warnings-as-errors --openjdk-target=aarch64-apple-darwin --with-extra-cflags='-arch arm64' --with-extra-ldflags='-arch arm64' --with-extra-cxxflags='-arch arm64'
>
> Vladimir Kempik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove unused at_rsp from aarch64

This is an extremely difficult patch to review. I'll be soliciting other people's advice to help understand the risk versus reward ratio to bring this in to mainline.
One thing to consider is that, given the good performance of Rosetta, x86 binaries can be used. So, in effect this is only a performance patch for Mac/AArch64. On the other hand, Mac/AArch64 has been working well for some time on the AArch64-port/11u repo.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/715