--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	2015-02-11 22:34:19.177474400 +0900
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	2015-02-11 22:34:18.422474400 +0900
@@ -2252,6 +2252,7 @@
   switch (cause) {
     case GCCause::_gc_locker:               return GCLockerInvokesConcurrent;
     case GCCause::_java_lang_system_gc:     return ExplicitGCInvokesConcurrent;
+    case GCCause::_dcmd_gc_run:             return ExplicitGCInvokesConcurrent;
     case GCCause::_g1_humongous_allocation: return true;
     case GCCause::_update_allocation_context_stats_inc: return true;
     case GCCause::_wb_conc_mark:            return true;
--- old/src/share/vm/gc_interface/gcCause.cpp	2015-02-11 22:34:20.303474400 +0900
+++ new/src/share/vm/gc_interface/gcCause.cpp	2015-02-11 22:34:20.183474400 +0900
@@ -103,6 +103,9 @@
     case _last_ditch_collection:
       return "Last ditch collection";
 
+    case _dcmd_gc_run:
+      return "Diagnostic Command";
+
     case _last_gc_cause:
       return "ILLEGAL VALUE - last gc cause - ILLEGAL VALUE";
 
--- old/src/share/vm/gc_interface/gcCause.hpp	2015-02-11 22:34:20.961474400 +0900
+++ new/src/share/vm/gc_interface/gcCause.hpp	2015-02-11 22:34:20.668474400 +0900
@@ -74,6 +74,9 @@
     _g1_humongous_allocation,
 
     _last_ditch_collection,
+
+    _dcmd_gc_run,
+
     _last_gc_cause
   };
 
--- old/src/share/vm/memory/genCollectedHeap.cpp	2015-02-11 22:34:21.537474400 +0900
+++ new/src/share/vm/memory/genCollectedHeap.cpp	2015-02-11 22:34:21.376474400 +0900
@@ -322,9 +322,16 @@
 }
 
 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) {
-  return UseConcMarkSweepGC &&
-         ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) ||
-          (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent));
+  if (!UseConcMarkSweepGC) {
+    return false;
+  }
+
+  switch (cause) {
+    case GCCause::_gc_locker:           return GCLockerInvokesConcurrent;
+    case GCCause::_java_lang_system_gc:
+    case GCCause::_dcmd_gc_run:         return ExplicitGCInvokesConcurrent;
+    default:                            return false;
+  }
 }
 
 void GenCollectedHeap::do_collection(bool  full,
--- old/src/share/vm/services/diagnosticCommand.cpp	2015-02-11 22:34:22.195474400 +0900
+++ new/src/share/vm/services/diagnosticCommand.cpp	2015-02-11 22:34:21.978474400 +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::_dcmd_gc_run);
   } else {
     output()->print_cr("Explicit GC is disabled, no GC has been performed.");
   }