8366424: Missing type profiling in generated Record Object methods

[rm-gh-8]

Backporting JDK-8366424: Missing type profiling in generated Record Object methods.

This commit addresses a HotSpot profiling issue where shared bytecode causes "profile pollution" - multiple call sites sharing the same method profile, degrading type profiling effectiveness.

This backport has internal demand

Ran benchmark on macos-aarch64:

Benchmark                                  Mode  Cnt     Score    Error   Units
RecordMethodsBenchmark.equalsDistinct     thrpt   15   346.810 ±  4.077  ops/us
RecordMethodsBenchmark.equalsGenerated    thrpt   15   345.344 ±  2.830  ops/us
RecordMethodsBenchmark.equalsPolluted     thrpt   15   146.948 ±  3.605  ops/us
RecordMethodsBenchmark.equalsSpecial      thrpt   15   433.302 ±  6.331  ops/us
RecordMethodsBenchmark.hashCodeDistinct   thrpt   15   869.551 ± 11.816  ops/us
RecordMethodsBenchmark.hashCodeGenerated  thrpt   15   872.454 ± 11.104  ops/us
RecordMethodsBenchmark.hashCodePolluted   thrpt   15   215.734 ±  1.739  ops/us
RecordMethodsBenchmark.hashCodeSpecial    thrpt   15  1025.061 ± 10.919  ops/us

Results attached:

macos-aarch64-benchmark.log

Ran related tests (passed) on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

(Passed) - make test TEST=test/jdk/java/lang/runtime

Results attached:

windows-x64-specific-test.log
macos-aarch64-specific-test.log
linux-x64-specific-test.log
linux-aarch64-specific-test.log

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8366424 needs maintainer approval

Issue

• JDK-8366424: Missing type profiling in generated Record Object methods (Bug - P4 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/135/head:pull/135
$ git checkout pull/135

Update a local copy of the PR:
$ git checkout pull/135
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/135/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 135

View PR using the GUI difftool:
$ git pr show -t 135

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/135.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[openjdk]

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See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @rm-gh-8 This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (21cb2ca1)

[liach]

Beware this patch is not in a feature release yet, so it might not be sufficiently tested for production impact.

[rm-gh-8]

/approval request for backport of JDK-8366424: Missing type profiling in generated Record Object methods.

This commit addresses a HotSpot profiling issue where shared bytecode causes "profile pollution" - multiple call sites sharing the same method profile, degrading type profiling effectiveness.

This backport has internal demand

Low risk - Fix addressing a test problem caused by timeout behavior. The main concern is ensuring the new timeout values are appropriate.

[openjdk]

@rm-gh-8
8366424: The approval request has been created successfully.

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