8307766: Linux: Provide the option to override the timer slack

[shipilev]

Clean backport of experimental feature for in-field use.

Additional testing:

• Linux x86_64 fastdebug, new test
• Linux x86_64 fastdebug, tier1
• Linux x86_64 fastdebug, tier2
• Linux x86_64 fastdebug, tier3

---

Progress

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

Issue

• JDK-8307766: Linux: Provide the option to override the timer slack (Enhancement - P4)

Reviewers

• Thomas Stuefe (@tstuefe - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u.git pull/21/head:pull/21
$ git checkout pull/21

Update a local copy of the PR:
$ git checkout pull/21
$ git pull https://git.openjdk.org/jdk21u.git pull/21/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 21

View PR using the GUI difftool:
$ git pr show -t 21

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u/pull/21.diff

Webrev

Link to Webrev Comment

[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 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:

8307766: Linux: Provide the option to override the timer slack

Reviewed-by: stuefe

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 66 new commits pushed to the master branch:

• 24fe96b: 8309746: Reconfigure check should include make/conf/version-numbers.conf
• bb234a0: 8311026: Some G1 specific tests do not set -XX:+UseG1GC
• 75a792b: 8311285: report some fontconfig related environment variables in hs_err file
• e04b306: 8311249: Remove unused MemAllocator::obj_memory_range
• ffdf7ac: Merge
• 817dc55: 8300051: assert(JvmtiEnvBase::environments_might_exist()) failed: to enter event controller, JVM TI environments must exist
• aae2cbd: 8307185: pkcs11 native libraries make JNI calls into java code while holding GC lock
• 6786fa4: 8311902: Concurrency regression in the PBKDF2 key impl of SunJCE provider
• fde53fc: 8310551: vmTestbase/nsk/jdb/interrupt/interrupt001/interrupt001.java timed out due to missing prompt
• 6d9da7c: 8311815: Incorrect exhaustivity computation
• ... and 56 more: https://git.openjdk.org/jdk21u/compare/e1062802519e3a3073e2973e8d4d86c2e9187740...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.

[mlbridge]

Webrevs

• 00: Full (ddea2ec7)

[tstuefe]

Good (and low risk in my opinion, for 21).

[shipilev]

Testing is clean (the remaining GHA failure is unrelated). Reviews are good. Push approval is here.

/integrate

[openjdk]

Going to push as commit 53aceba.
Since your change was applied there have been 82 commits pushed to the master branch:

• 6f76b65: 8312573: Failure during CompileOnly parsing leads to ShouldNotReachHere
• 5c6cd06: Merge
• 731b2e9: 8313316: Disable runtime/ErrorHandling/MachCodeFramesInErrorFile.java on ppc64le
• 0439d58: 8300937: Update nroff pages in JDK 21 before RC
• bb63b79: 8313260: JDK21: ProblemList java/lang/ScopedValue/StressStackOverflow.java on linux-x86
• f242c3b: 8313241: Temporarily disable "malformed control flow" assert to reduce noise
• 1c875fd: 8313250: Exclude java/foreign/TestByteBuffer.java on AIX
• 3e9344a: 8312293: SIGSEGV in jfr.internal.event.EventWriter.putUncheckedByte after JDK-8312086
• a10dbce: 8313208: ProblemList java/util/concurrent/tck/JSR166TestCase.java on select platforms
• f666e60: 8313193: ProblemList java/util/concurrent/SynchronousQueue/Fairness.java on X64
• ... and 72 more: https://git.openjdk.org/jdk21u/compare/e1062802519e3a3073e2973e8d4d86c2e9187740...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit 53aceba.

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