From JDK-8326615, [~mbaesken]'s comment:
We see now errors in the test compiler/codecache/CheckSegmentedCodeCache.java on platform linuxppc64le , fastdebug . Is this related ?

stdout: [Error occurred during initialization of VM
Not enough space in non-nmethod code heap to run VM: 5120K < 5226K
];
stderr: []
exitValue = 1
 
java.lang.RuntimeException: 'Invalid code heap sizes' missing from stdout/stderr
       at jdk.test.lib.process.OutputAnalyzer.shouldContain(OutputAnalyzer.java:252)
       at compiler.codecache.CheckSegmentedCodeCache.failsWith(CheckSegmentedCodeCache.java:81)
       at compiler.codecache.CheckSegmentedCodeCache.main(CheckSegmentedCodeCache.java:186)
       at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
       at java.base/java.lang.reflect.Method.invoke(Method.java:573)
       at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
       at java.base/java.lang.Thread.run(Thread.java:1575)