8336640: Shenandoah: Parallel worker use in parallel_heap_region_iterate

[earthling-amzn]

Clean backport. Change is confined to Shenandoah.

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Progress

• JDK-8336640 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8336640: Shenandoah: Parallel worker use in parallel_heap_region_iterate (Enhancement - P4 - Approved)

Reviewers

• Aleksey Shipilev (@shipilev - Reviewer)

Reviewing

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[bridgekeeper]

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[openjdk]

@earthling-amzn 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:

8336640: Shenandoah: Parallel worker use in parallel_heap_region_iterate

Reviewed-by: shade

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At the time when this comment was updated there had been 99 new commits pushed to the master branch:

• 6ed940b: 8320682: [AArch64] C1 compilation fails with "Field too big for insn"
• fbfe11f: 8341024: [test] build/AbsPathsInImage.java fails with OOM when using ubsan-enabled binaries
• f766080: 8320397: RISC-V: Avoid passing t0 as temp register to MacroAssembler:: cmpxchg_obj_header/cmpxchgptr
• 8e19c8f: 8339386: Assertion on AIX - original PC must be in the main code section of the compiled method
• f9070df: 8341146: RISC-V: Unnecessary fences used for load-acquire in template interpreter
• e5dfeb1: 8342063: [21u][aix] Backport introduced redundant line in ProblemList
• 62e0147: Merge
• dfcd8d2: 8341989: [21u] Back out JDK-8327501 and JDK-8328366
• 0083bcd: 8341674: [21u] Remove designator DEFAULT_PROMOTED_VERSION_PRE=ea for release 21.0.5
• 90517f5: 8332644: Improve graph optimizations
• ... and 89 more: https://git.openjdk.org/jdk21u-dev/compare/29b65ab034d40f582505b93f38e0287453b4f796...master

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[openjdk]

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

[openjdk]

⚠️ @earthling-amzn 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 (6456fa07)

[shipilev]

Looks fine, thanks.

[earthling-amzn]

/approval request This is a performance enhancement for Shenandoah. It's a clean backport and there are no changes outside of Shenandoah. I do not believe the macos test failure is related to this change.

[openjdk]

@earthling-amzn
8336640: The approval request has been created successfully.

[GoeLin]

Please backport to 23 first.
Removing tag in the meantime

[earthling-amzn]

/approval request This is a performance enhancement for Shenandoah. It's a clean backport and there are no changes outside of Shenandoah. I do not believe the macos test failure is related to this change. We have been running this change in production for over a month now. This change has also been accepted in jdk23u.

[openjdk]

@earthling-amzn
8336640: The approval request has been updated successfully.