8287818: Shenandoah: adapt nmethod arming from Loom

[zhengyu123]

Loom implemented nmethod arming mechanism, which is very similar to Shenandoah's. Shenandoah can use it.

Test:

• hotspot_gc_shenandoah on Linux x86_64 and Windows x64
• tier1 with Shenandoah GC on Linux x86_64 and Windows x64
• hotspot_gc_shenandoah on AArch64

---

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-8287818: Shenandoah: adapt nmethod arming from Loom

Reviewers

• Aleksey Shipilev (@shipilev - Reviewer) ⚠️ Review applies to b4ef6d63

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk pull/9048/head:pull/9048
$ git checkout pull/9048

Update a local copy of the PR:
$ git checkout pull/9048
$ git pull https://git.openjdk.org/jdk pull/9048/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 9048

View PR using the GUI difftool:
$ git pr show -t 9048

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/9048.diff

[bridgekeeper]

👋 Welcome back zgu! 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]

@zhengyu123 The following labels will be automatically applied to this pull request:

• hotspot-gc
• shenandoah

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

[mlbridge]

Webrevs

• 02: Full - Incremental (b496a508)
• 01: Full - Incremental (b4ef6d63)
• 00: Full (30a2f41b)

[shipilev]

Looks mostly fine to me, but I have questions.

[openjdk]

@zhengyu123 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:

8287818: Shenandoah: adapt nmethod arming from Loom

Reviewed-by: shade

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 47 new commits pushed to the master branch:

• e322e77: 8288651: CDS test HelloUnload.java should not use literal string as ClassLoader name
• 40bf3b1: 8288993: Make AwtFramePackTest generic by removing @requires tag
• d4b040f: Merge
• 7e13cdb: 8289079: java/lang/Thread/jni/AttachCurrentThread/AttachTest.java#id1 failed with "RuntimeException: Test failed"
• 9c92da5: 8247407: tools/jlink/plugins/CompressorPluginTest.java test failing
• 7ac40f3: 8288983: broken link in com.sun.net.httpserver.SimpleFileServer
• 20f55ab: 8289044: ARM32: missing LIR_Assembler::cmove metadata type support
• bdf9902: 8288120: VerifyError with JEP 405 pattern match
• b0db333: 8288528: broken links in java.desktop
• 651cbeb: 8288080: (fc) FileChannel::map for MemorySegments should state it always throws UOE
• ... and 37 more: https://git.openjdk.org/jdk/compare/26c03c1860c6da450b5cd6a46576c78bea682f96...master

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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[zhengyu123]

/integrate

[openjdk]

Going to push as commit 549c6c2.
Since your change was applied there have been 52 commits pushed to the master branch:

• aa43824: 8289138: G1: Remove redundant is-marking-active checks in C1 barrier
• b4ab5fe: 8288396: Always create reproducible builds
• 3336971: 8289258: ProblemList some failing custom loader tests with ZGC
• 784fa0a: 8282036: Change java/util/zip/ZipFile/DeleteTempJar.java to stop HttpServer cleanly in case of exceptions
• ca78f7b: 8286259: Password cleanup after KeyStore.PasswordProtection in P11KeyStore
• e322e77: 8288651: CDS test HelloUnload.java should not use literal string as ClassLoader name
• 40bf3b1: 8288993: Make AwtFramePackTest generic by removing @requires tag
• d4b040f: Merge
• 7e13cdb: 8289079: java/lang/Thread/jni/AttachCurrentThread/AttachTest.java#id1 failed with "RuntimeException: Test failed"
• 9c92da5: 8247407: tools/jlink/plugins/CompressorPluginTest.java test failing
• ... and 42 more: https://git.openjdk.org/jdk/compare/26c03c1860c6da450b5cd6a46576c78bea682f96...master

Your commit was automatically rebased without conflicts.

[openjdk]

@zhengyu123 Pushed as commit 549c6c2.

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