8308103: Massive (up to ~30x) increase in C2 compilation time since JDK 17

[TobiHartmann]

Backport of JDK-8308103. Applies cleanly.

Thanks,
Tobias

---

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-8308103: Massive (up to ~30x) increase in C2 compilation time since JDK 17 (Bug - P3)

Reviewers

• Christian Hagedorn (@chhagedorn - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21.git pull/141/head:pull/141
$ git checkout pull/141

Update a local copy of the PR:
$ git checkout pull/141
$ git pull https://git.openjdk.org/jdk21.git pull/141/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 141

View PR using the GUI difftool:
$ git pr show -t 141

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21/pull/141.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back thartmann! 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]

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

• hotspot-compiler

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[mlbridge]

Webrevs

• 00: Full (3c7efa7f)

[chhagedorn]

Looks good.

[openjdk]

@TobiHartmann 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:

8308103: Massive (up to ~30x) increase in C2 compilation time since JDK 17

Reviewed-by: chagedorn

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.

[TobiHartmann]

Thanks, Christian!

[pfustc]

This patch causes assertion failure. See https://bugs.openjdk.org/browse/JDK-8312440

[TobiHartmann]

Thanks! I'll close this backport for now then.