8296796: Provide clean, platform-agnostic interface to C-heap trimming

[shipilev]

A little unclean backport to provide the basis for subsequent backport:
8293114: JVM should trim the native heap

The uncleanliness comes from #include blocks and copyright lines updates.

Additional testing:

• Trim native unit tests
• Linux AArch64 fastdebug tier1
• Linux AArch64 fastdebug tier2
• Linux AArch64 fastdebug tier3

---

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-8296796: Provide clean, platform-agnostic interface to C-heap trimming (Enhancement - P4)

Reviewers

• Thomas Stuefe (@tstuefe - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/1615/head:pull/1615
$ git checkout pull/1615

Update a local copy of the PR:
$ git checkout pull/1615
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/1615/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1615

View PR using the GUI difftool:
$ git pr show -t 1615

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/1615.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.

[mlbridge]

Webrevs

• 01: Full - Incremental (b542499b)
• 00: Full (f063ecd4)

[tstuefe]

Looks good

[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:

8296796: Provide clean, platform-agnostic interface to C-heap trimming

Reviewed-by: stuefe

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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[shipilev]

The RISC-V GHA needs #1613 to land in first. I'll wait for that one before integrating to make sure RISC-V parts are not broken by this.

[shipilev]

Testing is clean. Reviews are here. Push approval is here.

/integrate

[openjdk]

Going to push as commit c54ecfb.
Since your change was applied there have been 2 commits pushed to the master branch:

• 67c5150: 8311285: report some fontconfig related environment variables in hs_err file
• 14614f5: 8301269: Update Commons BCEL to Version 6.7.0

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit c54ecfb.

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