8321269: Require platforms to define DEFAULT_CACHE_LINE_SIZE

[shipilev]

Clean backport to improve platform support. Unblocks future backports that rely on default cache line size.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8321269 needs maintainer approval

Issue

• JDK-8321269: Require platforms to define DEFAULT_CACHE_LINE_SIZE (Enhancement - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/150/head:pull/150
$ git checkout pull/150

Update a local copy of the PR:
$ git checkout pull/150
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/150/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 150

View PR using the GUI difftool:
$ git pr show -t 150

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/150.diff

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[bridgekeeper]

👋 Welcome back shade! 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]

⚠️ @shipilev 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 (2efd82b6)

[shipilev]

/approval request Clean backport to improve platform support. Unblocks future backports that rely on default cache line size.

[openjdk]

@shipilev
8321269: The approval request has been created successfully.

[openjdk]

@shipilev 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:

8321269: Require platforms to define DEFAULT_CACHE_LINE_SIZE

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 103 new commits pushed to the master branch:

• ad2e114: 8323243: JNI invocation of an abstract instance method corrupts the stack
• d69a097: 8322282: Incorrect LoaderConstraintTable::add_entry after JDK-8298468
• 8084244: 8316319: Generational ZGC: The SoftMaxHeapSize might be wrong when CDS decreases the MaxHeapSize
• 2697a9d: 8318696: Do not use LFS64 symbols on Linux
• 1f9b03e: 8319128: sun/security/pkcs11 tests fail on OL 7.9 aarch64
• be8733b: 8319213: Compatibility.java reads both stdout and stderr of JdkUtils
• fae1a03: 8312416: Tests in Locale should have more descriptive names
• ada400c: 8318158: RISC-V: implement roundD/roundF intrinsics
• 1dd2f2a: 8169475: WheelModifier.java fails by timeout
• e9be531: 8077371: Binary files in JAXP test should be removed
• ... and 93 more: https://git.openjdk.org/jdk21u-dev/compare/d44b5dc7a634b08f27f9a3e71112607a12023f8b...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.

[shipilev]

/integrate

[openjdk]

Going to push as commit 34d97ab.
Since your change was applied there have been 104 commits pushed to the master branch:

• 63e52ed: 8318468: compiler/tiered/LevelTransitionTest.java fails with -XX:CompileThreshold=100 -XX:TieredStopAtLevel=1
• ad2e114: 8323243: JNI invocation of an abstract instance method corrupts the stack
• d69a097: 8322282: Incorrect LoaderConstraintTable::add_entry after JDK-8298468
• 8084244: 8316319: Generational ZGC: The SoftMaxHeapSize might be wrong when CDS decreases the MaxHeapSize
• 2697a9d: 8318696: Do not use LFS64 symbols on Linux
• 1f9b03e: 8319128: sun/security/pkcs11 tests fail on OL 7.9 aarch64
• be8733b: 8319213: Compatibility.java reads both stdout and stderr of JdkUtils
• fae1a03: 8312416: Tests in Locale should have more descriptive names
• ada400c: 8318158: RISC-V: implement roundD/roundF intrinsics
• 1dd2f2a: 8169475: WheelModifier.java fails by timeout
• ... and 94 more: https://git.openjdk.org/jdk21u-dev/compare/d44b5dc7a634b08f27f9a3e71112607a12023f8b...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit 34d97ab.

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