8292206: TestCgroupMetrics.java fails as getMemoryUsage() is lower than expected

[GoeLin]

I backport this for parity with 11.0.20-oracle.

---

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Issue

• JDK-8292206: TestCgroupMetrics.java fails as getMemoryUsage() is lower than expected

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$ git fetch https://git.openjdk.org/jdk11u-dev.git pull/1868/head:pull/1868
$ git checkout pull/1868

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$ git pull https://git.openjdk.org/jdk11u-dev.git pull/1868/head

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[bridgekeeper]

👋 Welcome back goetz! 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.

[openjdk]

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

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

8292206: TestCgroupMetrics.java fails as getMemoryUsage() is lower than expected

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[mlbridge]

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• 00: Full (fcba2bb8)

[GoeLin]

/integrate

[openjdk]

Going to push as commit 7e93c80.
Since your change was applied there have been 7 commits pushed to the master branch:

• 521833e: 8282077: PKCS11 provider C_sign() impl should handle CKR_BUFFER_TOO_SMALL error
• 2995d08: 8209880: tzdb.dat is not reproducibly built
• 1f49004: 8248701: On Windows generated modules-deps.gmk can contain backslash-r (CR) characters
• 7b2d5fc: 8257856: Make ClassFileVersionsTest.java robust to JDK version updates
• 6a28ccb: 8276880: Remove java/lang/RuntimeTests/exec/ExecWithDir as unnecessary
• 4548929: 8303476: Add the runtime version in the release file of a JDK image
• 1f601e9: 8303861: Error handling step timeouts should never be blocked by OnError and others

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit 7e93c80.

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