8277990: NMT: Remove NMT shutdown capability

[tstuefe]

This removes the NMT shutdown machinery from hotspot. For details, please see the associated JBS issue, as well as the companion change https://bugs.openjdk.org/browse/JDK-8277946 and CSR https://bugs.openjdk.org/browse/JDK-8277947.

This is not a clean backport, but the fixes are very minor:

• the original patch changes perfmemory_posix.cpp, but this hunk is not needed in JDK17
• A small fix was needed since the "shutdown" dcmd option in JDK17 had been deprecated out of carefulness, not outright removed: 5ce36d6 .

Testing:
I manually ran runtime/NMT and all gtest variants for NMT on linux x64 and x86.
SAP nightlies are scheduled.

---

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-8277990: NMT: Remove NMT shutdown capability

Reviewers

• Matthias Baesken (@MBaesken - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev pull/1116/head:pull/1116
$ git checkout pull/1116

Update a local copy of the PR:
$ git checkout pull/1116
$ git pull https://git.openjdk.org/jdk17u-dev pull/1116/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1116

View PR using the GUI difftool:
$ git pr show -t 1116

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/1116.diff

[bridgekeeper]

👋 Welcome back stuefe! 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 (1259e5b9)
• 00: Full (5ce36d6c)

[tstuefe]

Windows GHA issues unrelated; SAP nightlies are error-free

[MBaesken]

LGTM

[openjdk]

@tstuefe 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:

8277990: NMT: Remove NMT shutdown capability

Reviewed-by: mbaesken

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 9 new commits pushed to the master branch:

• 4a9bd23: 8275704: Metaspace::contains() should be threadsafe
• b22bce8: 8276086: Increase size of metaspace mappings
• 1a38e26: 8297963: Partially fix string expansion issues in UTIL_DEFUN_NAMED and related macros
• 4e5f5de: 8192931: Regression test java/awt/font/TextLayout/CombiningPerf.java fails
• 5fd778b: 8300692: GCC 12 reports some compiler warnings in bundled freetype
• 651ba86: 8286694: Incorrect argument processing in java launcher
• f6ad61c: 8275582: Don't purge metaspace mapping lists
• b7d83f4: 8293466: libjsig should ignore non-modifying sigaction calls
• fae1628: 8293493: Signal Handlers printout should show signal block state

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.

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

[tstuefe]

GHA errors on Windows unrelated. Nightlies at SAP are clean.

/integrate

[openjdk]

Going to push as commit 9a992ab.
Since your change was applied there have been 17 commits pushed to the master branch:

• 7b39d48: 8298129: Let checkpoint event sizes grow beyond u4 limit
• 0e98d6a: 8301397: [11u, 17u] Bump jtreg to fix issue with build JDK 11.0.18
• 201ceb7: 8280007: Enable Neoverse N1 optimizations for Arm Neoverse V1 & N2
• 7fa6bc2: 8294160: misc crash dump improvements
• a7c0ed1: 8230374: maxOutputSize, instead of javatest.maxOutputSize, should be used in TEST.properties
• 9fc178b: 8285965: TestScenarios.java does not check for "" correctly
• d37977e: 8286873: Improve websocket test execution time
• 4be1ed4: 8284115: [IR Framework] Compilation is not found due to rare safepoint while dumping PrintIdeal/PrintOptoAssembly
• 4a9bd23: 8275704: Metaspace::contains() should be threadsafe
• b22bce8: 8276086: Increase size of metaspace mappings
• ... and 7 more: https://git.openjdk.org/jdk17u-dev/compare/d1ad5962502519a24e5fc3945a493ae3a8e41d74...master

Your commit was automatically rebased without conflicts.

[openjdk]

@tstuefe Pushed as commit 9a992ab.

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