Factor out logging from CgroupSubsystemFactory.create

Author: pejovica

src/java.base/linux/classes/jdk/internal/platform/CgroupSubsystemFactory.java

@@ -104,8 +104,7 @@ public static CgroupMetrics create(Optional<CgroupTypeResult> optResult) {
         // not ready to deal with that on a per-controller basis. Return no metrics
         // in that case
         if (result.isAnyCgroupV1Controllers() && result.isAnyCgroupV2Controllers()) {
-            Logger logger = System.getLogger("jdk.internal.platform");
-            logger.log(Level.DEBUG, "Mixed cgroupv1 and cgroupv2 not supported. Metrics disabled.");
+            warn("Mixed cgroupv1 and cgroupv2 not supported. Metrics disabled.");
             return null;
         }
 
@@ -121,6 +120,11 @@ public static CgroupMetrics create(Optional<CgroupTypeResult> optResult) {
         }
     }
 
+    private static void warn(String msg) {
+        Logger logger = System.getLogger("jdk.internal.platform");
+        logger.log(Level.DEBUG, msg);
+    }
+
     /*
      * Determine the type of the cgroup system (v1 - legacy or hybrid - or, v2 - unified)
      * based on three files: