RFR: 8316418: containers/docker/TestMemoryWithCgroupV1.java get OOM killed with Parallel GC

[Severin Gehwolf]

Please review this test fix to restrain the number of cores being used for the test. What matters for the test is the memory limit. The test verifies that a certain memory limit with swappiness set to 0 returns the memory limit (without swap). On some systems with many cores the memory limit might be too small for the number of threads the JVM creates with the set limit. I propose to make the number of cores the test is allowed to used to a fixed value: 4 over the number of cores available on the system, which makes the test passing system dependent.

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Commit messages:
 - 8316418: containers/docker/TestMemoryWithCgroupV1.java get OOM killed with Parallel GC

Changes: https://git.openjdk.org/jdk/pull/15840/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15840&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316418
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15840.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15840/head:pull/15840

PR: https://git.openjdk.org/jdk/pull/15840