--- old/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	2015-12-14 21:50:28.334701629 -0800
+++ new/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	2015-12-14 21:50:28.242701632 -0800
@@ -2908,6 +2908,7 @@
   // a safepoint is indeed in progress as a young generation
   // stop-the-world GC happens even as we mark in this generation.
   assert(_collectorState == Marking, "inconsistent state?");
+  _gc_timer_cm->register_gc_concurrent_start("Concurrent Mark");
   check_correct_thread_executing();
   verify_overflow_empty();
 
@@ -2927,6 +2928,7 @@
     log_debug(gc)("bailing out to foreground collection");
   }
   verify_overflow_empty();
+  _gc_timer_cm->register_gc_concurrent_end();
   return res;
 }
 
@@ -5293,6 +5295,7 @@
 
 void CMSCollector::sweep() {
   assert(_collectorState == Sweeping, "just checking");
+  _gc_timer_cm->register_gc_concurrent_start("Concurrent Sweep");
   check_correct_thread_executing();
   verify_work_stacks_empty();
   verify_overflow_empty();
@@ -5373,6 +5376,7 @@
   GenCollectedHeap* gch = GenCollectedHeap::heap();
   gch->clear_incremental_collection_failed();  // Worth retrying as fresh space may have been freed up
   gch->update_full_collections_completed(_collection_count_start);
+  _gc_timer_cm->register_gc_concurrent_end();
 }
 
 // FIX ME!!! Looks like this belongs in CFLSpace, with