[jdk8u-dev] RFR: 8253435: Cgroup: 'stomping of _mount_path' crash if manually mounted cpusets exist [v3]

[Jonathan Dowland]

> This is a clean backport of 8253435 to jdk8u-dev for cgroups v2 support.

Jonathan Dowland has updated the pull request incrementally with three additional commits since the last revision:

 - Merge branch '8239785-jdk8u-dev' into 8253435-jdk8u-dev
 - Update file path in comment
 - Severin's test fixes. Thanks!

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/158/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/158/files/acf8fc25..9b225830

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=158&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=158&range=01-02

  Stats: 73 lines in 4 files changed: 50 ins; 4 del; 19 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/158.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/158/head:pull/158

PR: https://git.openjdk.org/jdk8u-dev/pull/158