[jdk8u-dev] RFR: 8239559: Cgroups: Incorrect detection logic on some systems [v2]

[Jonathan Dowland]

> This is a backport of 53ee0c4963007b86db7979312b81f990e6ce271a via the 11u backport 53ee0c4963007b86db7979312b81f990e6ce271a for cgroups v2 support in jdk8u-dev.
> 
> It isn't clean: context differences in CgroupSubsystemFactory.java around the use of post-8u logging in the original patch.
> 
> I also had to Optional.isEmpty which is not present in 8u's Optional.

Jonathan Dowland has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/136/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/136/files/d1951ba9..d1951ba9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=136&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=136&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/136.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/136/head:pull/136

PR: https://git.openjdk.org/jdk8u-dev/pull/136