8264821: DirectIOTest fails on a system with large block size

[bplb]

Please review this request to clean up a test. The main change is to ensure that the capacity passed to ByteBuffer.allocateDirect() is large enough that when alignedSlice() is called on the new buffer, it creates an aligned buffer which does not have size zero due due to position rounding resulting in out-of-bound values. Other changes in the test are cleanup.

---

Progress

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Issue

• JDK-8264821: DirectIOTest fails on a system with large block size

Reviewers

• Chris Hegarty (@ChrisHegarty - Reviewer)

Reviewing

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[bridgekeeper]

👋 Welcome back bpb! 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]

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[mlbridge]

Webrevs

• 00: Full (53e7c793)

[openjdk]

@bplb 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:

8264821: DirectIOTest fails on a system with large block size

Reviewed-by: chegar

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 9 new commits pushed to the master branch:

• 75b039a: 8263970: Manual test javax/swing/JTextField/JapaneseReadingAttributes/JapaneseReadingAttributes.java failed
• f5b2f08: 8257836: Add additional test cases to TestSyncOnValueBasedClassEvent.java
• 27dd88b: 8262957: (fs) Fail fast in UnixFileStore.isExtendedAttributesEnabled
• e2106d5: 8265104: CpuLoad and SystemCpuLoad in OperatingSystem MXBean returns -1.0
• ebbce91: 8264681: Use the blessed modifier order in java.security
• ea5c55a: 8265103: Remove unnecessary inclusion of oopMap.hpp
• 26186ec: 8039261: [TEST_BUG]: There is not a minimal security level in Java Preferences and the TestApplet.html is blocked.
• 283d64f: 8262896: [macos_aarch64] Crash in jni_fast_GetLongField
• 55d5649: 8263157: [macos]: java.library.path is being set incorrectly

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
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.

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[bplb]

/integrate

[openjdk]

@bplb Since your change was applied there have been 11 commits pushed to the master branch:

• 0afcbd4: 8264412: AArch64: CPU description should refer DMI
• 4661690: 8262883: doccheck: Broken links in java.base
• 75b039a: 8263970: Manual test javax/swing/JTextField/JapaneseReadingAttributes/JapaneseReadingAttributes.java failed
• f5b2f08: 8257836: Add additional test cases to TestSyncOnValueBasedClassEvent.java
• 27dd88b: 8262957: (fs) Fail fast in UnixFileStore.isExtendedAttributesEnabled
• e2106d5: 8265104: CpuLoad and SystemCpuLoad in OperatingSystem MXBean returns -1.0
• ebbce91: 8264681: Use the blessed modifier order in java.security
• ea5c55a: 8265103: Remove unnecessary inclusion of oopMap.hpp
• 26186ec: 8039261: [TEST_BUG]: There is not a minimal security level in Java Preferences and the TestApplet.html is blocked.
• 283d64f: 8262896: [macos_aarch64] Crash in jni_fast_GetLongField
• ... and 1 more: https://git.openjdk.java.net/jdk/compare/e80012ede3564a868abc1705f332bcee942baf48...master

Your commit was automatically rebased without conflicts.

Pushed as commit 7e4cd48.

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

[AlanBateman]

It might be a bit clearer to pass the blockSize to the testRead and testWrite methods.

[mlbridge]

Mailing list message from Brian Burkhalter on nio-dev:

On Apr 14, 2021, at 8:43 AM, Alan Bateman <alanb at openjdk.java.net<mailto:alanb at openjdk.java.net>> wrote:

test/jdk/java/nio/channels/FileChannel/directio/DirectIOTest.java line 72:

70: private static int testRead(Path p) throws Exception {
71: try (FileChannel fc = FileChannel.open(p, ExtendedOpenOption.DIRECT)) {
72: int bs = (int)blockSize;

It might be a bit clearer to pass the blockSize to the testRead and testWrite methods.

You are probably correct but I already integrated this change.
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