RFR: 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected [v21]

[Jan Kratochvil]

> The testcase requires root permissions.
> 
> Fix by  Severin Gehwolf.
> Testcase by Jan Kratochvil.

Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 12 commits:

 - Functionality fixes after the refactorization
 - Fix up compilation
 - Merge remote-tracking branch 'origin/master' into master-cgroup
 - Merge remote-tracking branch 'origin/master' into master-cgroup
 - Testcase update upon review by Severin Gehwolf
 - Testcase update upon review by Severin Gehwolf
 - Inline adjust_controller() twice
 - Revert "Unify 4 copies of adjust_controller()"
   
   This reverts commit 77a81d07d74c8ae9bf34bfd8df9bcaca451ede9a.
 - Implement vm.cgroup.tools
 - Use Metrics.systemMetrics().getProvider()
 - ... and 2 more: https://git.openjdk.org/jdk/compare/07352c67...f06645f2

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

Changes: https://git.openjdk.org/jdk/pull/17198/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17198&range=20
  Stats: 590 lines in 12 files changed: 514 ins; 54 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/17198.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17198/head:pull/17198

PR: https://git.openjdk.org/jdk/pull/17198