8271579: G1: Move copy before CAS in do_copy_to_survivor_space

[dchuyko]

Small change in G1 with good performance effect. Original patch applies cleanly.

Testing: jtreg tier1 & gc (aarch64 build).

---

Progress

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Issues

• JDK-8271579: G1: Move copy before CAS in do_copy_to_survivor_space
• JDK-8272070: G1: Simplify age calculation after JDK-8271579

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk17u-dev pull/42/head:pull/42
$ git checkout pull/42

Update a local copy of the PR:
$ git checkout pull/42
$ git pull https://git.openjdk.java.net/jdk17u-dev pull/42/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 42

View PR using the GUI difftool:
$ git pr show -t 42

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk17u-dev/pull/42.diff

[bridgekeeper]

👋 Welcome back dchuyko! 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 issues from the original commit.

[openjdk]

@dchuyko 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:

8271579: G1: Move copy before CAS in do_copy_to_survivor_space
8272070: G1: Simplify age calculation after JDK-8271579

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 4 new commits pushed to the master branch:

• f016e60: 8275610: C2: Object field load floats above its null check resulting in a segfault
• 3adb3dd: 8278099: two sun/security/pkcs11/Signature tests failed with AssertionError
• 38fdf4f: 8276623: JDK-8275650 accidentally pushed "out" file
• d30b6e4: 8277328: jdk/jshell/CommandCompletionTest.java failures on Windows

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[mlbridge]

Webrevs

• 00: Full (d71bd839)

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[dchuyko]

No failures in test/hotspot/jtreg/applications/jcstress on Graviton2, 64 cpus.

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[bridgekeeper]

@dchuyko This pull request has been inactive for more than 8 weeks and will now be automatically closed. If you would like to continue working on this pull request in the future, feel free to reopen it! This can be done using the /open pull request command.