8321815: Shenandoah: gc state should be synchronized to java threads only once per safepoint

[earthling-amzn]

Clean backport.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8321815 needs maintainer approval

Issue

• JDK-8321815: Shenandoah: gc state should be synchronized to java threads only once per safepoint (Enhancement - P4 - Approved)

Reviewing

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$ git fetch https://git.openjdk.org/jdk22u.git pull/31/head:pull/31
$ git checkout pull/31

Update a local copy of the PR:
$ git checkout pull/31
$ git pull https://git.openjdk.org/jdk22u.git pull/31/head

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$ git pr checkout 31

View PR using the GUI difftool:
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[bridgekeeper]

👋 Welcome back wkemper! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[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 (889368a2)

[earthling-amzn]

/approval request Clean backport. This change reduces work on the safepoint. We've tested this with Dacapo, Extremem, Heapothesys, SpecJBB2015 and SpecJVM2008.

[openjdk]

@earthling-amzn
8321815: The approval request has been created successfully.

[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:

8321815: Shenandoah: gc state should be synchronized to java threads only once per safepoint

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At the time when this comment was updated there had been 5 new commits pushed to the master branch:

• 251938a: 8324041: ModuleOption.java failed with update release versioning scheme
• 2e91b4e: 8319382: com/sun/jdi/JdwpAllowTest.java shows failures on AIX if prefixLen of mask is larger than 32 in IPv6 case
• af59286: 8324050: Issue store-store barrier after re-materializing objects during deoptimization
• f5dc3ea: 8324280: RISC-V: Incorrect implementation in VM_Version::parse_satp_mode
• 291bd16: 8324659: GHA: Generic jtreg errors are not reported

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[earthling-amzn]

/integrate

[openjdk]

@earthling-amzn
Your change (at version 889368a) is now ready to be sponsored by a Committer.

[shipilev]

/sponsor

[openjdk]

Going to push as commit dfc86f9.
Since your change was applied there have been 5 commits pushed to the master branch:

• 251938a: 8324041: ModuleOption.java failed with update release versioning scheme
• 2e91b4e: 8319382: com/sun/jdi/JdwpAllowTest.java shows failures on AIX if prefixLen of mask is larger than 32 in IPv6 case
• af59286: 8324050: Issue store-store barrier after re-materializing objects during deoptimization
• f5dc3ea: 8324280: RISC-V: Incorrect implementation in VM_Version::parse_satp_mode
• 291bd16: 8324659: GHA: Generic jtreg errors are not reported

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev @earthling-amzn Pushed as commit dfc86f9.

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