8261636: The test mapping in hugetlbfs_sanity_check should consider LargePageSizeInBytes

[kstefanj]

When explicit large pages are enabled we do a sanity check to test if there are large pages configured. This sanity check just tests if there are any pages available of the systems default large page size. When the flag LargePageSizeInBytes is specified the JVM will try to use this large page size for all its mapping, except for the first sanity mapping. This can lead to large pages being disabled because the sanity mapping failed, while there are still plenty of pages available of the size specified by LargePageSizeInBytes.

The fix is to simply take the large page size into consideration in the sanity-check, making sure the correct flags are passed when needed.

Testing

• Manual testing verifying the problem when for example only 1g pages are available. Before the fix these large pages could not be used (unless the default large page size was changed to 1g or there were also 2m pages configured).

---

Progress

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

Issue

• JDK-8261636: The test mapping in hugetlbfs_sanity_check should consider LargePageSizeInBytes

Reviewers

• Thomas Schatzl (@tschatzl - Reviewer)
• Ivan Walulya (@walulyai - Committer)

Download

$ git fetch https://git.openjdk.java.net/jdk pull/2695/head:pull/2695
$ git checkout pull/2695

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[openjdk]

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[mlbridge]

Webrevs

• 01: Full - Incremental (144df02)
• 00: Full (a7fcf1b)

[tschatzl]

Since the exact same code to add these bits is now three times in that file, it may be interesting to add and use a (static?) method?

[kstefanj]

Since the exact same code to add these bits is now three times in that file, it may be interesting to add and use a (static?) method?

Good point, that makes sense.

[tschatzl]

A cpp file local static method would have been fine with me too, but this is as good.

[openjdk]

@kstefanj 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:

8261636: The test mapping in hugetlbfs_sanity_check should consider LargePageSizeInBytes

Reviewed-by: tschatzl, iwalulya

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 64 new commits pushed to the master branch:

• 702ca62: 8262185: G1: Prune collection set candidates early
• 8bc8542: 8262195: Harden tests that use the HostsFileNameService (jdk.net.hosts.file property)
• 20c93b3: 8261914: IfNode::fold_compares_helper faces non-canonicalized bool when running JRuby JSON workload
• ddd550a: 8261308: C2: assert(inner->is_valid_counted_loop(T_INT) && inner->is_strip_mined()) failed: OuterStripMinedLoop should have been removed
• 03d888f: 8261804: Remove field _processing_is_mt, calculate it instead
• 6800ba4: 8257500: Drawing MultiResolutionImage with ImageObserver "leaks" memory
• 65a245e: 8262329: Fix JFR parser exception messages
• a4c2496: 8259535: ECDSA SignatureValue do not always have the specified length
• 2515c42: 8262332: serviceability/sa/ClhsdbJhisto.java fails with Test ERROR java.lang.RuntimeException: 'ParselTongue' missing from stdout/stderr
• 07061fc: 8256417: Exclude TestJFRWithJMX test from running with PodMan
• ... and 54 more: https://git.openjdk.java.net/jdk/compare/29c72631ee3f4f1f88a36f25b933642ea9659681...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]

A cpp file local static method would have been fine with me too, but this is as good.

Then I would have had to pass the default_large_page_size() or changed its visibility, so I went with making the helper a member.

[walulyai]

Lgtm!

[kstefanj]

Thanks Thomas and Ivan for the reviews :)

[kstefanj]

/integrate

[openjdk]

@kstefanj Since your change was applied there have been 64 commits pushed to the master branch:

• 702ca62: 8262185: G1: Prune collection set candidates early
• 8bc8542: 8262195: Harden tests that use the HostsFileNameService (jdk.net.hosts.file property)
• 20c93b3: 8261914: IfNode::fold_compares_helper faces non-canonicalized bool when running JRuby JSON workload
• ddd550a: 8261308: C2: assert(inner->is_valid_counted_loop(T_INT) && inner->is_strip_mined()) failed: OuterStripMinedLoop should have been removed
• 03d888f: 8261804: Remove field _processing_is_mt, calculate it instead
• 6800ba4: 8257500: Drawing MultiResolutionImage with ImageObserver "leaks" memory
• 65a245e: 8262329: Fix JFR parser exception messages
• a4c2496: 8259535: ECDSA SignatureValue do not always have the specified length
• 2515c42: 8262332: serviceability/sa/ClhsdbJhisto.java fails with Test ERROR java.lang.RuntimeException: 'ParselTongue' missing from stdout/stderr
• 07061fc: 8256417: Exclude TestJFRWithJMX test from running with PodMan
• ... and 54 more: https://git.openjdk.java.net/jdk/compare/29c72631ee3f4f1f88a36f25b933642ea9659681...master

Your commit was automatically rebased without conflicts.

Pushed as commit 0a7fff4.

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