--- old/src/hotspot/share/gc/epsilon/epsilonArguments.cpp	2019-10-09 16:08:46.117271847 +0200
+++ new/src/hotspot/share/gc/epsilon/epsilonArguments.cpp	2019-10-09 16:08:45.901272288 +0200
@@ -45,13 +45,25 @@
     FLAG_SET_DEFAULT(ExitOnOutOfMemoryError, true);
   }
 
+  // Warn users that non-resizable heap might be better for some configurations.
+  // We are not adjusting the heap size by ourselves, because it affects startup time.
+  if (InitialHeapSize != MaxHeapSize) {
+    log_warning(gc)("Consider setting -Xms equal to -Xmx to avoid resizing hiccups");
+  }
+
+  // Warn users that AlwaysPreTouch might be better for some configurations.
+  // We are not turning this on by ourselves, because it affects startup time.
+  if (FLAG_IS_DEFAULT(AlwaysPreTouch) && !AlwaysPreTouch) {
+    log_warning(gc)("Consider enabling -XX:+AlwaysPreTouch to avoid memory commit hiccups");
+  }
+
   if (EpsilonMaxTLABSize < MinTLABSize) {
-    warning("EpsilonMaxTLABSize < MinTLABSize, adjusting it to " SIZE_FORMAT, MinTLABSize);
+    log_warning(gc)("EpsilonMaxTLABSize < MinTLABSize, adjusting it to " SIZE_FORMAT, MinTLABSize);
     EpsilonMaxTLABSize = MinTLABSize;
   }
 
   if (!EpsilonElasticTLAB && EpsilonElasticTLABDecay) {
-    warning("Disabling EpsilonElasticTLABDecay because EpsilonElasticTLAB is disabled");
+    log_warning(gc)("Disabling EpsilonElasticTLABDecay because EpsilonElasticTLAB is disabled");
     FLAG_SET_DEFAULT(EpsilonElasticTLABDecay, false);
   }