JDK-8324637: [aix] Implement support for reporting swap space in jdk.management

[MBaesken]

The get_total_or_available_swap_space_size coding misses AIX support, we only return 0. This should be enhanced.
The perfstat API can be used, see https://www.ibm.com/docs/pt/aix/7.2?topic=interfaces-perfstat-memory-total-interface .

---

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-8324637: [aix] Implement support for reporting swap space in jdk.management (Bug - P4)

Reviewers

• Kevin Walls (@kevinjwalls - Committer)
• Thomas Stuefe (@tstuefe - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/17569/head:pull/17569
$ git checkout pull/17569

Update a local copy of the PR:
$ git checkout pull/17569
$ git pull https://git.openjdk.org/jdk.git pull/17569/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 17569

View PR using the GUI difftool:
$ git pr show -t 17569

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/17569.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back mbaesken! 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]

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

• jmx
• serviceability

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

• 00: Full (2a3d017e)

[kevinjwalls]

I can't try this and don't use AIX, but it looks good.
It follows the same pattern as the other AIX cases in the file.

Although the others (e.g. line 200) don't throw_internal_error if the call returns -1, they just return -1. You might want to do that for consistency of behaviour.

[tstuefe]

Small nit, otherwise good.

[tstuefe]

Do we need the cast? perfstat_memory_total_t members are all 64-bit, no?

Also, can we shorten this to:

return (available ? memory_info.pgsp_free : memory_info.pgsp_total) * 4096;

[MBaesken]

Do we need the cast? perfstat_memory_total_t members are all 64-bit, no?

Also, can we shorten this to:

return (available ? memory_info.pgsp_free : memory_info.pgsp_total) * 4096;

Hi Thomas, I see no types defined here https://www.ibm.com/docs/pt/aix/7.2?topic=interfaces-perfstat-memory-total-interface but most likely you are correct and they are 64bit.

[openjdk]

@MBaesken 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:

8324637: [aix] Implement support for reporting swap space in jdk.management

Reviewed-by: kevinw, stuefe

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:

• e709842: 8324636: Serial: Remove Generation::block_is_obj
• 7a798d3: 8324598: use mem_unit when working with sysinfo memory and swap related information
• 6d36eb7: 8322768: Optimize non-subword vector compress and expand APIs for AVX2 target.
• 9d1a6d1: 8323645: Remove unused internal sun.net.www.protocol.jar.URLJarFileCallBack interface

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.

[MBaesken]

I can't try this and don't use AIX, but it looks good. It follows the same pattern as the other AIX cases in the file.

Although the others (e.g. line 200) don't throw_internal_error if the call returns -1, they just return -1. You might want to do that for consistency of behaviour.

Hi I wanted to be consistent to the other OS in get_total_or_available_swap_space_size, that#s why the throw_internal_error .

[kevinjwalls]

I can't try this and don't use AIX, but it looks good. It follows the same pattern as the other AIX cases in the file.
Although the others (e.g. line 200) don't throw_internal_error if the call returns -1, they just return -1. You might want to do that for consistency of behaviour.

Hi I wanted to be consistent to the other OS in get_total_or_available_swap_space_size, that#s why the throw_internal_error .

Ok yes, you can choose who to be consistent with... 8-)

[MBaesken]

/integrate

[openjdk]

Going to push as commit 33324a5.
Since your change was applied there have been 12 commits pushed to the master branch:

• 10066cd: 8324571: JDK 23 L10n resource files update
• bde8789: 8324123: aarch64: fix prfm literal encoding in assembler
• b5995a7: 8302019: Clarify Elements.overrides
• 95310ea: 8223696: java/net/httpclient/MaxStreams.java failed with didn't finish within the time-out
• 39b756a: 8324492: Remove Atomic support for OopHandle
• 12b89cd: 8323717: Introduce test keyword for tests that need external dependencies
• 746a086: 8306767: Concurrent repacking of extra data in MethodData is potentially unsafe
• ffe3bb6: 8324657: Intermittent OOME on exception message create
• e709842: 8324636: Serial: Remove Generation::block_is_obj
• 7a798d3: 8324598: use mem_unit when working with sysinfo memory and swap related information
• ... and 2 more: https://git.openjdk.org/jdk/compare/3059c3b69ec8fb7cefd740bc2eb52b5ca5390ae1...master

Your commit was automatically rebased without conflicts.

[openjdk]

@MBaesken Pushed as commit 33324a5.

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