Bug ID: JDK-8239785 Cgroups: Incorrect detection logic on old systems in hotspot

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JDK 11	JDK 15	JDK 8	Other
11.0.16Fixed	15 b15Fixed	8u371Fixed	openjdk8u372Fixed

This bug is similar to JDK-8239559, but for hotspot's cgroup version detection heuristic. Currently on old systems it prints this (even though this is cgroups v1):

./images/jdk/bin/java -Xlog:os+container=trace -version
[0.004s][trace][os,container] OSContainer::init: Initializing Container Support
[0.005s][trace][os,container] Mount point for cgroupv2 not found in /proc/self/mountinfo
openjdk version "15.0.0.1-internal" 2020-02-20

This used to be:
# java -Xlog:os+container=trace -version
[0.000s][trace][os,container] OSContainer::init: Initializing Container Support
[0.001s][debug][os,container] Required cgroup memory subsystem not found

Fix Request (8u) Please consider this for jdk8u-dev as part of cgroups v2 support. Thank you
09-12-2022
A pull request was submitted for review. URL: https://git.openjdk.org/jdk8u-dev/pull/135 Date: 2022-10-12 10:19:37 +0000
12-10-2022
Fix request (11u) Please consider this backport to 11u as part of adding cgroups v2 support. The patch was clean except for one copyright line in src/hotspot/share/prims/whitebox.hpp. Thanks
25-03-2022
A pull request was submitted for review. URL: https://git.openjdk.java.net/jdk11u-dev/pull/946 Date: 2022-03-25 10:17:45 +0000
25-03-2022
A pull request was submitted for review. URL: https://git.openjdk.java.net/jdk11u-dev/pull/881 Date: 2022-03-11 11:04:45 +0000
11-03-2022
A pull request was submitted for review. URL: https://git.openjdk.java.net/jdk11u-dev/pull/880 Date: 2022-03-11 10:56:27 +0000
11-03-2022
URL: https://hg.openjdk.java.net/jdk/jdk/rev/d527da8f8f9b User: sgehwolf Date: 2020-03-12 13:45:37 +0000
12-03-2020
RFR: http://mail.openjdk.java.net/pipermail/hotspot-dev/2020-February/040978.html
25-02-2020
ILW = MMH = P3
25-02-2020
The suggested fix is to not continue if no cgroup controllers are mounted. There's no point to (host values will be used instead) and the misleading cgroup v2 detection message is gone.
25-02-2020
Candidate webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8239785/01/webrev/
25-02-2020

Relates :	JDK-8239559 - Cgroups: Incorrect detection logic on some systems
Relates :	JDK-8230305 - Cgroups v2: Container awareness
Relates :	JDK-8253435 - Cgroup: 'stomping of _mount_path' crash if manually mounted cpusets exist