8310015: ZGC: Unbounded asynchronous unmapping can lead to running out of address space

[fisk]

Hi all,

This pull request contains a backport of commit 4229baf9 from the openjdk/jdk repository.

The commit being backported was authored by Erik Österlund on 19 Jun 2023 and was reviewed by Stefan Karlsson and Axel Boldt-Christmas.

Thanks!

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8310015: ZGC: Unbounded asynchronous unmapping can lead to running out of address space (Bug - P2)

Reviewers

• Stefan Karlsson (@stefank - Reviewer)
• Axel Boldt-Christmas (@xmas92 - Committer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21.git pull/28/head:pull/28
$ git checkout pull/28

Update a local copy of the PR:
$ git checkout pull/28
$ git pull https://git.openjdk.org/jdk21.git pull/28/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 28

View PR using the GUI difftool:
$ git pr show -t 28

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21/pull/28.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back eosterlund! 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]

@fisk The following label will be automatically applied to this pull request:

• hotspot

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[openjdk]

@fisk 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:

8310015: ZGC: Unbounded asynchronous unmapping can lead to running out of address space

Reviewed-by: stefank, aboldtch

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 no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential 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 (41bc647e)

[fisk]

Thanks for the reviews @xmas92 and @stefank!
/integrate

[openjdk]

Going to push as commit 14c5091.
Since your change was applied there have been 3 commits pushed to the master branch:

• 36e3fe9: 8309928: JFR: View issues
• 4d81b89: 8309960: ParallelGC young collections very slow in DelayInducer
• ace5623: 8308643: Incorrect value of 'used' jvmstat counter

Your commit was automatically rebased without conflicts.

[openjdk]

@fisk Pushed as commit 14c5091.

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