8322583: RISC-V: Enable fast class initialization checks

[zifeihan]

Hi, The same issue also exists in the JDK17u. Since corresponding fixes for the other ports are already there in jdk17u, I would like to backport this to jdk17u too. So I would like to backport this to JDK17u. Tier1-3 tested with release build using qemu systems. This is a risc-v specific change. Backport is clean, risk is low.

The original performance issue reported by JDK-8219233 is resolved when this optimization is enabled (x2.1 improvement for reported case on linux-riscv64).

OpenJDK17 linux-riscv64 when setting VM_Version::supports_fast_class_init_checks returns false(default):

$ clojure -A:user
"Elapsed time: 78459.498421 msecs"
$ clojure -A:user
"Elapsed time: 77513.115408 msecs"
$ clojure -A:user
"Elapsed time: 75132.908155 msecs"
$ clojure foo.clj
"Elapsed time: 36337.585315 msecs"
$ clojure foo.clj
"Elapsed time: 35009.33778 msecs"
$ clojure foo.clj
"Elapsed time: 35490.216435 msecs"

OpenJDK17 linux-riscv64 when setting VM_Version::supports_fast_class_init_checks returns true:

$ clojure -A:user
"Elapsed time: 37013.598933 msecs"
$ clojure -A:user
"Elapsed time: 36210.164686 msecs"
$ clojure -A:user
"Elapsed time: 36674.069441 msecs"
$ clojure foo.clj
"Elapsed time: 36813.877226 msecs"
$ clojure foo.clj
"Elapsed time: 37079.673782 msecs"

---

Progress

• JDK-8322583 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8322583: RISC-V: Enable fast class initialization checks (Enhancement - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/2110/head:pull/2110
$ git checkout pull/2110

Update a local copy of the PR:
$ git checkout pull/2110
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/2110/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2110

View PR using the GUI difftool:
$ git pr show -t 2110

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/2110.diff

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[bridgekeeper]

👋 Welcome back gcao! 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]

⚠️ @zifeihan 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.

[mlbridge]

Webrevs

• 00: Full (35464e15)

[openjdk]

@zifeihan 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:

8322583: RISC-V: Enable fast class initialization checks

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 7 new commits pushed to the master branch:

• 0927587: 6928542: Chinese characters in RTF are not decoded
• 26b5597: 8322725: (tz) Update Timezone Data to 2023d
• 002270c: 8323021: Shenandoah: Encountered reference count always attributed to first worker thread
• bfd23ae: 8322772: Clean up code after JDK-8322417
• 1f95796: 8321599: Data loss in AVX3 Base64 decoding
• 2470cac: 8316693: Simplify at-requires checkDockerSupport()
• f59ca35: 8303605: Memory leaks in Metaspace gtests

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[zifeihan]

/integrate

[openjdk]

@zifeihan
Your change (at version 35464e1) is now ready to be sponsored by a Committer.

[RealFYang]

/sponsor

[openjdk]

Going to push as commit 262b83c.
Since your change was applied there have been 7 commits pushed to the master branch:

• 0927587: 6928542: Chinese characters in RTF are not decoded
• 26b5597: 8322725: (tz) Update Timezone Data to 2023d
• 002270c: 8323021: Shenandoah: Encountered reference count always attributed to first worker thread
• bfd23ae: 8322772: Clean up code after JDK-8322417
• 1f95796: 8321599: Data loss in AVX3 Base64 decoding
• 2470cac: 8316693: Simplify at-requires checkDockerSupport()
• f59ca35: 8303605: Memory leaks in Metaspace gtests

Your commit was automatically rebased without conflicts.

[openjdk]

@RealFYang @zifeihan Pushed as commit 262b83c.

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