[jdk8u-dev] RFR: 8284977: MetricsTesterCgroupV2.getLongValueEntryFromFile fails when named value doesn't exist [v2]

[Kurashige Taizo]

> Hi all,
> 
> I'd like to backport this to jdk8u-dev.
> It fixes a test failure caused by cgroups virtual files (nr_periods etc) not existing in some circumstances.
> 
> Thanks.

Kurashige Taizo has updated the pull request incrementally with one additional commit since the last revision:

  Update full name

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/215/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/215/files/3bcfa1d5..4bbc576b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=215&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=215&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/215.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/215/head:pull/215

PR: https://git.openjdk.org/jdk8u-dev/pull/215