8280030: [REDO] Parallel: More precise boundary in ObjectStartArray::object_starts_in_range

[reinrich]

This backport is a transitive dependency for the backport of https://bugs.openjdk.org/browse/JDK-8310031

8310031 requires 8282094: [REDO] Parallel: Refactor PSCardTable::scavenge_contents_parallel
and 8282094 requires this backport.

8310031 could be backported w/o this backport if 8282094 could be squashed into it because with 8310031 ObjectStartArray::object_starts_in_range() is not reached anymore from PSCardTable::scavenge_contents_parallel().

This backport applies cleanly but needs a trivial renaming (see 2nd commit).

Risk is low: it's a small change. The changed method has just 2 callers of which one is for diagnostics.

Manual testing on x86_64:
jdk:tier1 TEST_VM_OPTS="-XX:+UseParallelGC"
langtools:tier1 TEST_VM_OPTS="-XX:+UseParallelGC"

Local CI Testing:
The fix passed our CI testing (e.g. 2024-02-22): JTReg tests: tier1-4 of hotspot and jdk. All of Langtools and jaxp. JCK, SPECjvm2008, SPECjbb2015, Renaissance Suite, and SAP specific tests (also with ParallelGC).
Testing was done with fastdebug builds on the main platforms and also on Linux/PPC64le.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8280030 needs maintainer approval

Issue

• JDK-8280030: [REDO] Parallel: More precise boundary in ObjectStartArray::object_starts_in_range (Enhancement - P4 - Approved)

Reviewers

• Paul Hohensee (@phohensee - Reviewer)
• Zhengyu Gu (@zhengyu123 - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/2226/head:pull/2226
$ git checkout pull/2226

Update a local copy of the PR:
$ git checkout pull/2226
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/2226/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2226

View PR using the GUI difftool:
$ git pr show -t 2226

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/2226.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back rrich! 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]

⚠️ @reinrich the given backport hash 7319e4ed482845b61cbce2f7785c77b91ab94b81 is an ancestor of your proposed change. Please update the title with the hash for the change you are backporting.

[openjdk]

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

[mlbridge]

Webrevs

• 00: Full (7319e4ed)

[openjdk]

⚠️ @reinrich 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.

[zhengyu123]

LGTM

[openjdk]

@reinrich 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:

8280030: [REDO] Parallel: More precise boundary in ObjectStartArray::object_starts_in_range

Reviewed-by: phh, zgu

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 37 new commits pushed to the master branch:

• 47ec134: Merge
• f45e587: 8322750: Test "api/java_awt/interactive/SystemTrayTests.html" failed because A blue ball icon is added outside of the system tray
• 72881de: 8305900: Use loopback IP addresses in security policy files of httpclient tests
• 158f91a: 8272651: G1 heap region info print order changed by JDK-8269914
• f3e90af: 8324824: AArch64: Detect Ampere-1B core and update default options for Ampere CPUs
• bfe8974: 8323519: Add applications/ctw/modules to Hotspot tiered testing
• 3add2e3: 8272903: Missing license header in ArenaAllocator.java
• ab602af: 8323210: Update the usage of cmsFLAGS_COPY_ALPHA
• 0052ab7: 8269914: Factor out heap printing for G1 young and full gc
• 85a49ed: 8311893: Interactive component with ARIA role 'tabpanel' does not have a programmatically associated name
• ... and 27 more: https://git.openjdk.org/jdk17u-dev/compare/3285292597efd34176465df0b0394cc4a99605eb...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.

[reinrich]

Thanks for review and approval!
/integrate

[openjdk]

Going to push as commit dbf4a99.
Since your change was applied there have been 37 commits pushed to the master branch:

• 47ec134: Merge
• f45e587: 8322750: Test "api/java_awt/interactive/SystemTrayTests.html" failed because A blue ball icon is added outside of the system tray
• 72881de: 8305900: Use loopback IP addresses in security policy files of httpclient tests
• 158f91a: 8272651: G1 heap region info print order changed by JDK-8269914
• f3e90af: 8324824: AArch64: Detect Ampere-1B core and update default options for Ampere CPUs
• bfe8974: 8323519: Add applications/ctw/modules to Hotspot tiered testing
• 3add2e3: 8272903: Missing license header in ArenaAllocator.java
• ab602af: 8323210: Update the usage of cmsFLAGS_COPY_ALPHA
• 0052ab7: 8269914: Factor out heap printing for G1 young and full gc
• 85a49ed: 8311893: Interactive component with ARIA role 'tabpanel' does not have a programmatically associated name
• ... and 27 more: https://git.openjdk.org/jdk17u-dev/compare/3285292597efd34176465df0b0394cc4a99605eb...master

Your commit was automatically rebased without conflicts.

[openjdk]

@reinrich Pushed as commit dbf4a99.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.