diff -r 8c911031c3e7 src/share/vm/gc_interface/gcCause.cpp
--- a/src/share/vm/gc_interface/gcCause.cpp	Wed Jan 07 10:19:00 2015 +0100
+++ b/src/share/vm/gc_interface/gcCause.cpp	Wed Jan 07 23:43:47 2015 +0900
@@ -103,6 +103,9 @@
     case _last_ditch_collection:
       return "Last ditch collection";
 
+    case _jcmd_gc_run:
+      return "jcmd GC.run";
+
     case _last_gc_cause:
       return "ILLEGAL VALUE - last gc cause - ILLEGAL VALUE";
 
diff -r 8c911031c3e7 src/share/vm/gc_interface/gcCause.hpp
--- a/src/share/vm/gc_interface/gcCause.hpp	Wed Jan 07 10:19:00 2015 +0100
+++ b/src/share/vm/gc_interface/gcCause.hpp	Wed Jan 07 23:43:47 2015 +0900
@@ -74,6 +74,9 @@
     _g1_humongous_allocation,
 
     _last_ditch_collection,
+
+    _jcmd_gc_run,
+
     _last_gc_cause
   };
 
diff -r 8c911031c3e7 src/share/vm/services/diagnosticCommand.cpp
--- a/src/share/vm/services/diagnosticCommand.cpp	Wed Jan 07 10:19:00 2015 +0100
+++ b/src/share/vm/services/diagnosticCommand.cpp	Wed Jan 07 23:43:47 2015 +0900
@@ -267,7 +267,7 @@
 
 void SystemGCDCmd::execute(DCmdSource source, TRAPS) {
   if (!DisableExplicitGC) {
-    Universe::heap()->collect(GCCause::_java_lang_system_gc);
+    Universe::heap()->collect(GCCause::_jcmd_gc_run);
   } else {
     output()->print_cr("Explicit GC is disabled, no GC has been performed.");
   }