8268443: ParallelGC Full GC should use parallel WeakProcessor

[albertnetymk]

Simple change of making weak oops processing in Full GC cycles parallel for Parallel collector.

Tested: running benchmarks with gc+phases=debug and confirm the Weak Processing time in Full GCs becomes shorter.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8268443: ParallelGC Full GC should use parallel WeakProcessor

Reviewers

• Kim Barrett (@kimbarrett - Reviewer)
• Stefan Johansson (@kstefanj - Reviewer)
• Thomas Schatzl (@tschatzl - Reviewer)

Contributors

• Kim Barrett <kbarrett@openjdk.org>

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/4444/head:pull/4444
$ git checkout pull/4444

Update a local copy of the PR:
$ git checkout pull/4444
$ git pull https://git.openjdk.java.net/jdk pull/4444/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 4444

View PR using the GUI difftool:
$ git pr show -t 4444

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/4444.diff

[albertnetymk]

/contributor add kbarrett

[bridgekeeper]

👋 Welcome back ayang! 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]

@albertnetymk
Contributor Kim Barrett <kbarrett@openjdk.org> successfully added.

[openjdk]

@albertnetymk The following label will be automatically applied to this pull request:

• hotspot-gc

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (afef5989)

[kimbarrett]

Looks good.

[openjdk]

@albertnetymk 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:

8268443: ParallelGC Full GC should use parallel WeakProcessor

Co-authored-by: Kim Barrett <kbarrett@openjdk.org>
Reviewed-by: kbarrett, sjohanss, tschatzl

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 20 new commits pushed to the master branch:

• d4377af: 8263303: C2 compilation fails with assert(found_sfpt) failed: no node in loop that's not input to safepoint
• dd1cbad: 8268285: vmTestbase/nsk/jvmti/GetThreadState/thrstat002 failed with "Wrong thread "thr1" (...) state after SuspendThread"
• ece3ae3: 8268388: Update large pages information in Java manpage
• 2623b0b: 8268475: execute runtime/InvocationTests w/ -UseVtableBasedCHA
• f839308: 8268407: ProblemList sun/tools/jstat/jstatLineCountsX.sh on linux-aarch64 due to JDK-8268211
• 58ba48b: 8268192: LambdaMetafactory with invokespecial causes VerificationError
• b41f3f8: 8268478: JVMCI tests failing after JDK-8268052
• 7ff6e7b: 8267954: Shared classes that failed to load should not be loaded again
• 991ca14: 8267430: GraphicsDevice.setDisplayMode(REFRESH_RATE_UNKNOWN) throws IAE: Unable to set display mode!
• bf29a01: 8228343: JCMD and attach fail to work across Linux Container boundary
• ... and 10 more: https://git.openjdk.java.net/jdk/compare/7b1e4024c02e6e831502e20cdbf54efb6240d12b...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.

[kstefanj]

Looks good!

[tschatzl]

Ship it.

[albertnetymk]

Thanks for the review.

/integrate

[openjdk]

Going to push as commit a95e64c.
Since your change was applied there have been 44 commits pushed to the master branch:

• 0a6c7d8: 8267424: CTW: C1 fails with "State must not be null"
• e11f70a: 8003216: Add JFR event indicating explicit System.gc() call
• 2b41459: 8267073: Race between Card Redirtying and Freeing Collection Set regions results in missing remembered set entries with G1
• 7cd5a6e: 8268537: (Temporary) Disable ParallelRefProcEnabled for Parallel GC
• f716711: 8265271: JFR: Allow use of .jfc options when starting JFR
• f677163: 8266130: convert Thread-SMR stress tests from counter based to time based
• 6c552a7: 8268544: some runtime/sealedClasses tests should be run in driver mode
• f4b3170: 8268428: Test java/foreign/TestResourceScope.java fails: expected [M] but found [N]
• 6b6ff53: 8268543: some runtime/verifier tests should be run in driver mode
• 0924382: 8266766: Arrays of types that cannot be an annotation member do not yield exceptions
• ... and 34 more: https://git.openjdk.java.net/jdk/compare/7b1e4024c02e6e831502e20cdbf54efb6240d12b...master

Your commit was automatically rebased without conflicts.

[openjdk]

@albertnetymk Pushed as commit a95e64c.

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