8253421: Initialize JFR trace-IDs with zero

[rkennke]

Currently, JFR trace-IDs for classloaders, packages and modules are initialized with 1, and the first call to atomic_inc() will update it to 2, which will be the first trace-IDs for those objects. We can initialize them to 0 and start counting at 1 instead.

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Progress

• Change must not contain extraneous whitespace
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• Change must be properly reviewed

Issue

• JDK-8253421: Initialize JFR trace-IDs with zero

Reviewers

• Markus Grönlund (@mgronlun - Reviewer)
• Erik Gahlin (@egahlin - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/jdk pull/285/head:pull/285
$ git checkout pull/285

[bridgekeeper]

👋 Welcome back rkennke! 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.

[rkennke]

/label add jfr,hotspot,rfr

[openjdk]

@rkennke The label jfr is not a valid label. These labels are valid:

• serviceability
• hotspot
• sound
• hotspot-compiler
• kulla
• i18n
• shenandoah
• jdk
• javadoc
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• security
• swing
• hotspot-runtime
• jmx
• build
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• beans
• core-libs
• compiler
• net
• hotspot-gc
• hotspot-jfr
• awt

[openjdk]

@rkennke The following label will be automatically applied to this pull request: hotspot-jfr.

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[rkennke]

/label add hotspot-jfr

[openjdk]

@rkennke The hotspot-jfr label was already applied.

[mlbridge]

Webrevs

• 00: Full (8ae5d47)

[mgronlun]

Looks good.

[openjdk]

@rkennke This change now passes all automated pre-integration checks. In addition to the automated checks, the change must also fulfill all project specific requirements

After integration, the commit message will be:

8253421: Initialize JFR trace-IDs with zero

Reviewed-by: mgronlun, egahlin

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Since the source branch of this PR was last updated there have been 104 commits pushed to the master branch:

• aa38624: 8248352: [TEST_BUG] Test test/jdk/java/awt/font/TextLayout/ArabicDiacriticTest.java can leave frame open
• ae20dd6: 8251496: Fix doclint warnings in jdk.net.httpserver
• b9729cb: 8253284: Zero OrderAccess barrier mappings are incorrect
• 284bbf0: 8253079: DeterministicDump.java fails due to garbage in structure padding
• a4affd5: 8253412: Unsupported GC options passed in JAVA_TOOL_OPTIONS are silently ignored
• 96f722c: 8252114: Windows-AArch64: Enable and test ZGC and ShenandoahGC
• f7b1ce4: 8253447: Remove buggy code introduced by 8249451
• 282b9dc: 8081833: Clean up JVMFlag getter/setter code
• 0e98fc1: 8253237: [REDO] Improve large object handling during evacuation
• d1f9b8a: 8234808: jdb quoted option parsing broken
• ... and 94 more: https://git.openjdk.java.net/jdk/compare/68da63dcdead52418b41f80d381b105ce71a8162...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid automatic rebasing, please merge master into your branch, and then specify the current head hash when integrating, like this: /integrate aa3862403bf5977844e1c362494619f44ce069dc.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[rkennke]

/integrate

[openjdk]

@rkennke Since your change was applied there have been 104 commits pushed to the master branch:

• aa38624: 8248352: [TEST_BUG] Test test/jdk/java/awt/font/TextLayout/ArabicDiacriticTest.java can leave frame open
• ae20dd6: 8251496: Fix doclint warnings in jdk.net.httpserver
• b9729cb: 8253284: Zero OrderAccess barrier mappings are incorrect
• 284bbf0: 8253079: DeterministicDump.java fails due to garbage in structure padding
• a4affd5: 8253412: Unsupported GC options passed in JAVA_TOOL_OPTIONS are silently ignored
• 96f722c: 8252114: Windows-AArch64: Enable and test ZGC and ShenandoahGC
• f7b1ce4: 8253447: Remove buggy code introduced by 8249451
• 282b9dc: 8081833: Clean up JVMFlag getter/setter code
• 0e98fc1: 8253237: [REDO] Improve large object handling during evacuation
• d1f9b8a: 8234808: jdb quoted option parsing broken
• ... and 94 more: https://git.openjdk.java.net/jdk/compare/68da63dcdead52418b41f80d381b105ce71a8162...master

Your commit was automatically rebased without conflicts.

Pushed as commit 0c287de.

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