8281318: Improve jfr/event/allocation tests reliability

[shipilev]

Clean backport to improve JFR tests on x86_32. Needs JDK-8281638 as the follow-up.

Additional testing:

• Linux x86_32 fastdebug, affected tests fail without the patch, pass with it

---

Progress

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

Issue

• JDK-8281318: Improve jfr/event/allocation tests reliability

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk17u-dev pull/240/head:pull/240
$ git checkout pull/240

Update a local copy of the PR:
$ git checkout pull/240
$ git pull https://git.openjdk.java.net/jdk17u-dev pull/240/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 240

View PR using the GUI difftool:
$ git pr show -t 240

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk17u-dev/pull/240.diff

[bridgekeeper]

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[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:

8281318: Improve jfr/event/allocation tests reliability

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[mlbridge]

Webrevs

• 00: Full (1064be01)

[shipilev]

Got the push approval.
/integrate

[openjdk]

Going to push as commit cf2a7ab.
Since your change was applied there have been 11 commits pushed to the master branch:

• 5d1969b: 8277893: Arraycopy stress tests
• 4f0d711: 8281615: Deadlock caused by jdwp agent
• 943c2b3: 8278766: Enable OpenJDK build support for reproducible jars and jmods using --date
• 7b65a39: 8273139: C2: assert(f <= 1 && f >= 0) failed: Incorrect frequency
• 3521504: 8283017: GHA: Workflows break with update release versions
• cd5684a: 8270435: UT: MonitorUsedDeflationThresholdTest failed: did not find too_many string in output
• 24ce3f4: 8274172: Convert JavadocTester to use NIO
• 88216d8: 8272168: some hotspot runtime/logging tests don't check exit code
• 16f7508: 8269077: TestSystemGC uses "require vm.gc.G1" for large pages subtest
• d4d3348: 8267163: Rename anonymous loader tests to hidden loader tests
• ... and 1 more: https://git.openjdk.java.net/jdk17u-dev/compare/5edb982271d22711507ae9e7b8ddacc2e2e2a4a3...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit cf2a7ab.

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