8257746: Regression introduced with JDK-8250984 - memory might be null in some machines

[kvergizova]

I'd like to backport JDK-8257746 to 13u for parity with 11u.
The patch doesn't apply cleanly since 13u doesn't have cgroups v2 support (JDK-8231111), so it reapplied manually to similar places in cgroupv1/Metrics.java.
Tested with tier1 and container tests.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
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Issue

• JDK-8257746: Regression introduced with JDK-8250984 - memory might be null in some machines

Reviewers

• Severin Gehwolf (@jerboaa - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/jdk13u-dev pull/133/head:pull/133
$ git checkout pull/133

[bridgekeeper]

👋 Welcome back evergizova! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (30b1b08)

[jerboaa]

Looks fine.

[openjdk]

@kvergizova This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8257746: Regression introduced with JDK-8250984 - memory might be null in some machines

Reviewed-by: sgehwolf

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential automatic rebasing, please check the documentation for the /integrate command for further details.

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[kvergizova]

/integrate

[openjdk]

@kvergizova Pushed as commit c668a0c.

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