8362573: Incorrect weight of the first ObjectAllocationSample JFR event (regression)

[vish-chan]

Backport of:

• 8362573: Incorrect weight of the first ObjectAllocationSample JFR event (regression)
• Fixes the incorrect weight reported for the first ObjectAllocationSample JFR event by ensuring that allocations that occurred before the recording start are not counted in the event weight.

Testing

• New test passes with the fix and fails without the fix.

Low risk as this is a clean backport.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8362573 needs maintainer approval

Issue

• JDK-8362573: Incorrect weight of the first ObjectAllocationSample JFR event (regression) (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/29/head:pull/29
$ git checkout pull/29

Update a local copy of the PR:
$ git checkout pull/29
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/29/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 29

View PR using the GUI difftool:
$ git pr show -t 29

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/29.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back vish-chan! 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 change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

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

[openjdk]

⚠️ @vish-chan This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[vish-chan]

/approval request for backport of JDK-8362573 which fixes the incorrect weight reported for the first ObjectAllocationSample JFR event by ensuring that allocations that occurred before the recording start are not counted in the event weight. New test passes with the fix and fails without the fix. Low risk as this is a clean backport.

[openjdk]

@vish-chan
8362573: The approval request has been created successfully.

[mlbridge]

Webrevs

• 00: Full (f43f6060)

[GoeLin]

Hi @vish-chan
The risk is not determined by the fact that a change is clean. Please have a second look at your risk assesment.
The risk assesment should take into account whether an application that updates the JVM will see any effect.
For example, if you change the default GC and this is backported clean, you will have a huge effect on applications although it is clean.

[GoeLin]

Also, please enable GHA actions.