RFR: 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected [v7]

[Jan Kratochvil]

> The testcase requires root permissions.

Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 23 commits:

 - Disable cgroup.subtree_control testcase on cgroup1
 - Extend the testcase
 - Implement cgroup.subtree_control .
 - Remove dir_ix; only the trivial cases.
 - Use *.effective kernel hints also in *.java
 - Update for the kernel update *.effective
 - Update for the kernel patch update hierarchical_memsw_limit->hierarchical_swap_limit
 - Merge branch 'master' into master-cgroup
 - Merge branch 'master' into master-cgroup
 - Fail reading memory.stat only once
 - ... and 13 more: https://git.openjdk.org/jdk/compare/2546afe2...4d3b3aa9

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Changes: https://git.openjdk.org/jdk/pull/17198/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17198&range=06
  Stats: 404 lines in 8 files changed: 363 ins; 18 del; 23 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