--- a/hotspot/src/share/vm/gc/shared/ageTable.cpp	Thu Feb 11 15:43:30 2016 -0500
+++ b/hotspot/src/share/vm/gc/shared/ageTable.cpp	Fri Feb 12 09:12:12 2016 +0100
@@ -24,6 +24,7 @@
 
 #include "precompiled.hpp"
 #include "gc/shared/ageTable.inline.hpp"
+#include "gc/shared/ageTableTracer.hpp"
 #include "gc/shared/collectedHeap.hpp"
 #include "gc/shared/collectorPolicy.hpp"
 #include "gc/shared/gcPolicyCounters.hpp"
@@ -100,17 +101,19 @@
   log_debug(gc, age)("Desired survivor size " SIZE_FORMAT " bytes, new threshold " UINTX_FORMAT " (max threshold " UINTX_FORMAT ")",
                      desired_survivor_size*oopSize, (uintx) result, MaxTenuringThreshold);
 
-  if (log_is_enabled(Trace, gc, age) || UsePerfData) {
+  if (log_is_enabled(Trace, gc, age) || UsePerfData || AgeTableTracer::is_tenuring_distribution_event_enabled()) {
     size_t total = 0;
     uint age = 1;
     while (age < table_size) {
-      total += sizes[age];
-      if (sizes[age] > 0) {
+      size_t wordSize = sizes[age];
+      total += wordSize;
+      if (wordSize > 0) {
         log_trace(gc, age)("- age %3u: " SIZE_FORMAT_W(10) " bytes, " SIZE_FORMAT_W(10) " total",
-                            age, sizes[age]*oopSize, total*oopSize);
+                            age, wordSize*oopSize, total*oopSize);
       }
+      AgeTableTracer::send_tenuring_distribution_event(age, wordSize*oopSize);
       if (UsePerfData) {
-        _perf_sizes[age]->set_value(sizes[age]*oopSize);
+        _perf_sizes[age]->set_value(wordSize*oopSize);
       }
       age++;
     }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/shared/ageTableTracer.cpp	Fri Feb 12 09:12:12 2016 +0100
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/shared/ageTableTracer.hpp"
+#include "gc/shared/gcId.hpp"
+#include "trace/tracing.hpp"
+
+void AgeTableTracer::send_tenuring_distribution_event(uint age, size_t size) {
+  EventTenuringDistribution e;
+  if (e.should_commit()) {
+    e.set_gcId(GCId::current());
+    e.set_age(age);
+    e.set_size(size);
+    e.commit();
+  }
+}
+
+bool AgeTableTracer::is_tenuring_distribution_event_enabled() {
+  return EventTenuringDistribution::is_enabled();
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/shared/ageTableTracer.hpp	Fri Feb 12 09:12:12 2016 +0100
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_AGETABLETRACER_HPP
+#define SHARE_VM_GC_SHARED_AGETABLETRACER_HPP
+
+#include "memory/allocation.hpp"
+
+class AgeTableTracer : AllStatic {
+  public:
+    static void send_tenuring_distribution_event(uint age, size_t size);
+    static bool is_tenuring_distribution_event_enabled();
+};
+
+#endif // SHARE_VM_GC_SHARED_AGETABLETRACER_HPP

--- a/hotspot/src/share/vm/trace/trace.xml	Thu Feb 11 15:43:30 2016 -0500
+++ b/hotspot/src/share/vm/trace/trace.xml	Fri Feb 12 09:12:12 2016 +0100
@@ -479,6 +479,13 @@
       <value type="BYTES64" field="size" label="Allocation Size" />
     </event>
 
+    <event id="TenuringDistribution" path="vm/gc/detailed/tenuring_distribution" label="Tenuring Distribution"
+           is_instant="true">
+      <value type="UINT" field="gcId" label="GC ID" relation="GC_ID"/>
+      <value type="UINT" field="age" label="Age" />
+      <value type="BYTES64" field="size" label="Size" />
+    </event>
+
     <!-- Compiler events -->
 
     <event id="Compilation" path="vm/compiler/compilation" label="Compilation"