8273797: Stop impersonating "server" VM in all VM variants

[shipilev]

As the follow-up for Zero-specific JDK-8273494, we might want to clean up build system logic for all VM variants: stop impersonating "server" VMs for all of them. This basically leaves "core" and "custom" variants to be handled with this patch.

Additional testing:

• Linux x86_64 core build passes, libjvm.so now in core, jvm.cfg mentions -core KNOWN
• Linux x86_64 custom (+serialgc,+compiler2) build passes, libjvm.so now in custom, jvm.cfg mentions -custom KNOWN

---

Progress

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Issue

• JDK-8273797: Stop impersonating "server" VM in all VM variants

Reviewers

• David Holmes (@dholmes-ora - Reviewer)
• Erik Joelsson (@erikj79 - Reviewer)
• Magnus Ihse Bursie (@magicus - Reviewer)

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[mlbridge]

Webrevs

• 00: Full (7745524f)

[dholmes-ora]

From a purely "mechanical" perspective this is a good simplification and cleanup.

Did you test building all variants into one image?

Cheers,
David

[openjdk]

@shipilev This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8273797: Stop impersonating "server" VM in all VM variants

Reviewed-by: dholmes, erikj, ihse

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 41 new commits pushed to the master branch:

• 6f3e40c: 8273825: TestIRMatching.java fails after JDK-8266550
• a561eac: 8273895: compiler/ciReplay/TestVMNoCompLevel.java fails due to wrong data size with TieredStopAtLevel=2,3
• d2388b7: 8273959: Some metaspace diagnostic switches should be develop
• dc7f452: 8273815: move have_special_privileges to os_posix for POSIX platforms
• 7c9868c: 8273454: C2: Transform (-a)(-b) into ab
• bb9d142: 8273958: gtest/MetaspaceGtests executes unnecessary tests in debug builds
• 2a2e919: 8273685: Remove jtreg tag manual=yesno for java/awt/Graphics/LCDTextAndGraphicsState.java & show test instruction
• 8302061: 8273774: CDSPluginTest should only expect classes_nocoops.jsa exists on supported 64-bit platforms
• 2f8c221: 8273681: Add Vector API vs Arrays.mismatch intrinsic benchmark
• 17f7a45: 8273913: Problem list some headful client jtreg tests that fail on macOS 12
• ... and 31 more: https://git.openjdk.java.net/jdk/compare/8fbcc8239a3fc04e56ebbd287c7bb5db731977b7...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[shipilev]

Did you test building all variants into one image?

Yes, I did, but I think the build system is confused about the VM feature sets. I have a vague recollection that ether @magicus or someone else at one point suggested eliminating multi-variant builds, maybe that should be the next step in build simplification.

[shipilev]

@magicus, want to take a look as well?

[magicus]

Looks good. Thanks for waiting for my input; sorry for the delay.

[magicus]

As for eliminating multi-JVM builds: yes, that is on my agenda, but as long as I'm still just working part-time it's hard to make any headway in that direction. The next step is to create a --with-import-jvms=<name:path>,[<name:path>,...], so that it is possible to simulate a multi-JVM build by e.g.

bash configure --with-jvm-variant=zero --with-conf-name=zero-hotspot
make hotspot
bash configure --with-jvm-variant=server --with-conf-name=combined --with-import-jvms=zero:./build/$PLATFORM/jdk/lib/zero

or something like that.

When that exists and is working, and all downstream users has had time to adapt, then we can remove multi-JVM build support (and boy am I longing for that day).

If you want to help by implementing the --with-import-jvms options, you are more than welcome!

[shipilev]

Thanks!

/integrate

[openjdk]

Going to push as commit f242cb5.
Since your change was applied there have been 63 commits pushed to the master branch:

• 240fa6e: 8273927: Enable hsdis for riscv64
• 9c91ff5: 8274031: Typo in StringBuilder.readObject
• d16bf04: 8273613: JFR: RemoteRecordingStream::start() blocks close()
• 7ce60c6: 8273651: JFR: onMetadata(), setStartTime(), setEndTime() lacks test coverage
• 1bd11a7: 8273887: [macos] java/awt/color/ICC_ColorSpace/MTTransformReplacedProfile.java timed out
• ee3576a: 8256735: JFR: 'jfr' tool displays incorrect timestamps
• 5fde4b6: 8273909: vmTestbase/nsk/jdi/Event/request/request001 can still fail with "ERROR: new event is not ThreadStartEvent"
• 04891c9: 8273912: Add threadControl_dumpThread(jthread) function
• 5c21c00: 8267163: Rename anonymous loader tests to hidden loader tests
• b3b4b1c: 8273907: Cleanup redundant Math.max/min calls in DefaultHighlighter
• ... and 53 more: https://git.openjdk.java.net/jdk/compare/8fbcc8239a3fc04e56ebbd287c7bb5db731977b7...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit f242cb5.

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