8282170: JVMTI SetBreakpoint metaspace allocation test

[shipilev]

There are few bugs in SetBreakpoint when it reaches for metaspace allocation, notably JDK-8214992 and JDK-8264149. This adds the test that exercises the metaspace allocation paths.

Requires JDK-8282172 to pass cleanly in fastdebug mode.

Additional testing:

• New test on Linux x86_64 fastdebug
• New test on Linux x86_64 release
• New test with JDK-8264149 reverted fails on Linux x86_64 release

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8282170: JVMTI SetBreakpoint metaspace allocation test

Reviewers

• Chris Plummer (@plummercj - Reviewer)
• Leonid Mesnik (@lmesnik - Reviewer)

Reviewing

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Checkout this PR locally:
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$ git checkout pull/7554

Update a local copy of the PR:
$ git checkout pull/7554
$ git pull https://git.openjdk.java.net/jdk pull/7554/head

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Checkout this PR locally:
$ git pr checkout 7554

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$ git pr show -t 7554

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https://git.openjdk.java.net/jdk/pull/7554.diff

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[openjdk]

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

• serviceability

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[mlbridge]

Webrevs

• 04: Full - Incremental (5e10e99d)
• 03: Full - Incremental (3a6f943e)
• 02: Full - Incremental (2df7af3b)
• 01: Full - Incremental (4edd20df)
• 00: Full (5ffee594)

[plummercj]

So you load a class 50 times in separate ClassLoaders, and each load triggers the ClassPrepare event, and each time that happens you set a breakpoint on each of the 1000 methods, meaning a total of 5000 breakpoints. Doing this will eventually trigger calling CollectorPolicy::satisfy_failed_metadata_allocation(). Previous to the 8264149 fix, this used to trigger an assert. Am I understanding this properly?

[shipilev]

So you load a class 50 times in separate ClassLoaders, and each load triggers the ClassPrepare event, and each time that happens you set a breakpoint on each of the 1000 methods, meaning a total of 5000 breakpoints. Doing this will eventually trigger calling CollectorPolicy::satisfy_failed_metadata_allocation(). Previous to the 8264149 fix, this used to trigger an assert. Am I understanding this properly?

Yes. That assert is actually the part of the larger issue: metaspace is full, GC is requested, and VM would probably hang if we allow it to happen, since we cannot easily schedule Full GCs when already at safepoint.

[openjdk]

@shipilev 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:

8282170: JVMTI SetBreakpoint metaspace allocation test

Reviewed-by: cjplummer, lmesnik

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 29 new commits pushed to the master branch:

• fdce97d: 8267820: (fs) Files.copy should attempt to copy POSIX attributes when target file in custom file system
• e8a1ce0: 8280881: (fs) UnixNativeDispatcher.close0 may throw UnixException
• 1668c02: 8277922: Unable to click JCheckBox in JTable through Java Access Bridge
• 2674799: 8282878: Removed _JavaThread from PhaseTraceTime
• 7c8ea9f: 8282509: [exploded image] ResolvedClassTest fails with similar output
• 9c88c5b: 8282948: JDK-8274980 missed correct handling of MACOSX_BUNDLE_BUILD_VERSION
• 83d7718: 8282893: Remove MacroAssembler::push/pop_callee_saved_registers
• 6a3a7b9: 6218162: DefaultTableColumnModel.getColumn() method should mention ArrayIndexOutOfBoundsException
• 5b78a82: 7017094: ParsedSynthStyle: parameter name "direction" should be changed to "tabIndex"
• 8aba4de: 8249592: Robot.mouseMove moves cursor to incorrect location when display scale varies and Java runs in DPI Unaware mode
• ... and 19 more: https://git.openjdk.java.net/jdk/compare/65ca0a5776df229ee91f420585ca1e8f91e489c6...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.

[shipilev]

Thanks @plummercj! Anyone else to review?

[shipilev]

Thanks @plummercj! Anyone else to review?

Friendly reminder.

[shipilev]

I also rewritten the test to use bundled ASM instead of long target class. This also allows bumping the number of methods in the target without adding a lot of new lines.

[lmesnik]

thank you for fixing

[sspitsyn]

Not a review yet but I'd suggest to convert .c to .cpp.
In long term we would like to get rid of the *.c files in the serviceability/jvmti test folder for consistency.

[shipilev]

Not a review yet but I'd suggest to convert .c to .cpp. In long term we would like to get rid of the *.c files in the serviceability/jvmti test folder for consistency.

Good thinking. I converted the test to C++, and this also allowed to simplify the JNI/JVMTI calls a bit.

[shipilev]

@lmesnik, @plummercj -- please re-ack the new version, thanks.

[shipilev]

Thanks!

/integrate

[openjdk]

Going to push as commit 7b91bbb.
Since your change was applied there have been 32 commits pushed to the master branch:

• b13cacc: 8254574: PrintWriter handling of InterruptedIOException should be removed
• 1f29523: 8282932: a space is needed for the unsupported protocol exception message in ProtocolVersion
• 879b644: 8282897: Fix call parameter to GetStringChars() in HostLocaleProviderAdapter_md.c
• fdce97d: 8267820: (fs) Files.copy should attempt to copy POSIX attributes when target file in custom file system
• e8a1ce0: 8280881: (fs) UnixNativeDispatcher.close0 may throw UnixException
• 1668c02: 8277922: Unable to click JCheckBox in JTable through Java Access Bridge
• 2674799: 8282878: Removed _JavaThread from PhaseTraceTime
• 7c8ea9f: 8282509: [exploded image] ResolvedClassTest fails with similar output
• 9c88c5b: 8282948: JDK-8274980 missed correct handling of MACOSX_BUNDLE_BUILD_VERSION
• 83d7718: 8282893: Remove MacroAssembler::push/pop_callee_saved_registers
• ... and 22 more: https://git.openjdk.java.net/jdk/compare/65ca0a5776df229ee91f420585ca1e8f91e489c6...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit 7b91bbb.

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