[jdk25u-dev] RFR: 8370572: Cgroups hierarchical memory limit is not honored after JDK-8322420 [v2]

[Severin Gehwolf]

> Unclean backport of JDK-8370572 since JDK-8292984 is not in 25u (a cleanup patch). That change basically renames `phys_mem` to `upper_bound`. Not really critical to get JDK-8292984 into 25u.
> 
> Please review!
> 
> Testing:
> - [x] GHA
> - [x] Container tests on Linux x86_64 on cgroups v1 including the test from JDK-8370966 ([see dependent PR](https://github.com/openjdk/jdk25u-dev/pull/77)). Also checked container tests on cgroups v2 for sanity. This patch is a no-op there.

Severin Gehwolf has updated the pull request incrementally with one additional commit since the last revision:

  Use the corretto approach

-------------

Changes:
  - all: https://git.openjdk.org/jdk25u-dev/pull/76/files
  - new: https://git.openjdk.org/jdk25u-dev/pull/76/files/36340d51..ee19fd11

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=76&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=76&range=00-01

  Stats: 29 lines in 1 file changed: 4 ins; 17 del; 8 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/76.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/76/head:pull/76

PR: https://git.openjdk.org/jdk25u-dev/pull/76