8364248: Separate commit and reservation limit detection

[shipilev]

This cleanup makes further backports in container code cleaner. Notably, it is on the way to JDK-8370572 backport. The full stack looks like this:

    Clean JDK-8370966: Create regression test for the hierarchical memory limit fix in JDK-8370572
(!) Clean JDK-8370572: Cgroups hierarchical memory limit is not honored after JDK-8322420
    Clean JDK-8292984: Refactor internal container-related interfaces for clarity
    Clean JDK-8356868: Not all cgroup parameters are made available
    Clean JDK-8367485: os::physical_memory is broken in 32-bit JVMs when running on 64-bit OSes
    Clean JDK-8357086: os::xxx functions returning memory size should return size_t
    Clean JDK-8357570: [macOS] os::Bsd::available_memory() might return too low values
>>> Clean JDK-8364248: Separate commit and reservation limit detection

Additional testing:

• Linux x86_64 server fastdebug, hotspot_gc

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8364248 needs maintainer approval

Issue

• JDK-8364248: Separate commit and reservation limit detection (Enhancement - P4 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/11/head:pull/11
$ git checkout pull/11

Update a local copy of the PR:
$ git checkout pull/11
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/11/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 11

View PR using the GUI difftool:
$ git pr show -t 11

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/11.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back shade! 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 change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @shipilev This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (9f0e5930)

[shipilev]

/approval request Cleanups the OS/GC interface a bit, and makes further backports in container code cleaner. Notably, it is on the way to JDK-8370572 backport. Applies cleanly. hotspot_gc tests pass. Risk is on lower side: this is mostly a refactoring, and has no bugtail since initial integration 4 months ago.

[openjdk]

@shipilev
8364248: The approval request has been created successfully.