8336640: Shenandoah: Parallel worker use in parallel_heap_region_iterate

[earthling-amzn]

Clean backport. Change is confined to Shenandoah.

---

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 - Requested)

Reviewers

• Aleksey Shipilev (@shipilev - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/973/head:pull/973
$ git checkout pull/973

Update a local copy of the PR:
$ git checkout pull/973
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/973/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 973

View PR using the GUI difftool:
$ git pr show -t 973

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/973.diff

Webrev

Link to Webrev Comment

[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 change is not yet ready to be integrated.
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]

⚠️ @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.