Merge pull request #227 from jmtd/OPENJDK-111-diagnostic-output

[OPENJDK-111] Adjust JVM parameters when JAVA_DIAGNOSTICS is set

Author: jmtd

modules/jdk/11/artifacts/opt/jboss/container/openjdk/jdk/jvm-options

@@ -6,5 +6,5 @@
 # ==============================================================================
 
 function jvm_specific_diagnostics() {
-    echo "-Xlog:gc::utctime -XX:NativeMemoryTracking=summary"
+    echo "-Xlog:gc::utctime -XX:NativeMemoryTracking=summary -XX:+UnlockDiagnosticVMOptions -XX:+PrintNMTStatistics -verbose:gc"
 }

modules/jdk/8/artifacts/opt/jboss/container/openjdk/jdk/jvm-options

@@ -6,5 +6,5 @@
 # ==============================================================================
 
 function jvm_specific_diagnostics() {
-    echo "-XX:NativeMemoryTracking=summary -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UnlockDiagnosticVMOptions"
+    echo "-XX:NativeMemoryTracking=summary -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UnlockDiagnosticVMOptions -XX:+PrintNMTStatistics -verbose:gc"
 }

modules/jvm/api/module.yaml

@@ -22,7 +22,7 @@ envs:
   description: Is used when no `-Xms` option is given in **JAVA_OPTS**. This is used to calculate the maximum value of the initial heap memory. If used in a container without any memory constraints for the container then this option has no effect. If there is a memory constraint then `-Xms` is limited to the value set here. The default is 4096MB which means the calculated value of `-Xms` never will be greater than 4096MB. The value of this variable is expressed in MB.
   example: "4096"
 - name: JAVA_DIAGNOSTICS
-  description: Set this to get some diagnostics information to standard output when things are happening. **Disabled by default.**
+  description: Set this to get some diagnostics information to standard output when things are happening. **Note:** This option, if set to true, will set `-XX:+UnlockDiagnosticVMOptions`. **Disabled by default.**
   example: "true"
 - name: JAVA_DEBUG
   description: If set remote debugging will be switched on. **Disabled by default.**