--- old/src/share/vm/gc/g1/concurrentMark.cpp	2015-12-14 21:50:28.778701613 -0800
+++ new/src/share/vm/gc/g1/concurrentMark.cpp	2015-12-14 21:50:28.698701616 -0800
@@ -436,6 +436,7 @@
   _has_aborted(false),
   _restart_for_overflow(false),
   _concurrent_marking_in_progress(false),
+  _concurrent_marking_from_roots(false),
 
   // _verbose_level set below
 
@@ -1003,6 +1004,18 @@
   }
 }
 
+void ConcurrentMark::register_mark_from_roots_phase_start() {
+  _concurrent_marking_from_roots = true;
+  _g1h->gc_timer_cm()->register_gc_concurrent_start("Concurrent Mark");
+}
+
+void ConcurrentMark::register_mark_from_roots_phase_end() {
+  _concurrent_marking_from_roots = false;
+  if (!has_aborted()) {
+    _g1h->gc_timer_cm()->register_gc_concurrent_end();
+  }
+}
+
 void ConcurrentMark::markFromRoots() {
   // we might be tempted to assert that:
   // assert(asynch == !SafepointSynchronize::is_at_safepoint(),
@@ -1011,6 +1024,8 @@
   // a safepoint is indeed in progress as a younger generation
   // stop-the-world GC happens even as we mark in this generation.
 
+  register_mark_from_roots_phase_start();
+
   _restart_for_overflow = false;
 
   // _g1h has _n_par_threads
@@ -1027,6 +1042,9 @@
   CMConcurrentMarkingTask markingTask(this, cmThread());
   _parallel_workers->set_active_workers(active_workers);
   _parallel_workers->run_task(&markingTask);
+
+  register_mark_from_roots_phase_end();
+
   print_stats();
 }