8261251: Shenandoah: Use object size for full GC humongous compaction

[rkennke]

Currently, copying objects in full GC humongous object comaction copies the full region. We can limit that to copying only the object size and save some wasted cycles. Also, this fixes a test failure with loom where object copy checks that the given size matches the object size.

• hotspot_gc_shenandoah
• tier1(+Shenandoah)

---

Progress

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

Issue

• JDK-8261251: Shenandoah: Use object size for full GC humongous compaction

Reviewers

• Andrew Haley (@theRealAph - Reviewer)
• Aleksey Shipilev (@shipilev - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/jdk pull/2433/head:pull/2433
$ git checkout pull/2433

[bridgekeeper]

👋 Welcome back rkennke! 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]

@rkennke The following labels will be automatically applied to this pull request:

• hotspot-gc
• shenandoah

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[mlbridge]

Webrevs

• 00: Full (36f9cea)

[openjdk]

@rkennke 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:

8261251: Shenandoah: Use object size for full GC humongous compaction

Reviewed-by: aph, shade

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 59 new commits pushed to the master branch:

• 9d59dec: 8248876: LoadObject with bad base address created for exec file on linux
• aa5bc6e: 8258953: AArch64: move NEON instructions to aarch64_neon.ad
• c5ff454: 8250989: Consolidate buffer allocation code for CDS static/dynamic dumping
• 0e18634: 8261270: MakeMethodNotCompilableTest fails with -XX:TieredStopAtLevel={1,2,3}
• 7a2db85: 8261022: Fix incorrect result of Math.abs() with char type
• 2c3a86f: 8261280: Remove THREAD argument from compute_loader_lock_object
• 74d40ab: 8261200: Some code in the ICC_Profile may not close file streams properly
• d7acfae: Merge
• 4de3a6b: 8260709: C2: assert(false) failed: unscheduable graph
• 5307afa: 8260585: AArch64: Wrong code generated for shifting right and accumulating four unsigned short integers
• ... and 49 more: https://git.openjdk.java.net/jdk/compare/f025bc1d5d81532a3bdb87665537de4aaf15b7ea...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.

[rkennke]

/integrate

[openjdk]

@rkennke Since your change was applied there have been 60 commits pushed to the master branch:

• d45343e: 8260899: ARM32: SyncOnValueBasedClassTest fails with assert(is_valid()) failed: invalid register
• 9d59dec: 8248876: LoadObject with bad base address created for exec file on linux
• aa5bc6e: 8258953: AArch64: move NEON instructions to aarch64_neon.ad
• c5ff454: 8250989: Consolidate buffer allocation code for CDS static/dynamic dumping
• 0e18634: 8261270: MakeMethodNotCompilableTest fails with -XX:TieredStopAtLevel={1,2,3}
• 7a2db85: 8261022: Fix incorrect result of Math.abs() with char type
• 2c3a86f: 8261280: Remove THREAD argument from compute_loader_lock_object
• 74d40ab: 8261200: Some code in the ICC_Profile may not close file streams properly
• d7acfae: Merge
• 4de3a6b: 8260709: C2: assert(false) failed: unscheduable graph
• ... and 50 more: https://git.openjdk.java.net/jdk/compare/f025bc1d5d81532a3bdb87665537de4aaf15b7ea...master

Your commit was automatically rebased without conflicts.

Pushed as commit deb0544.

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