--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	2013-11-11 18:32:51.236167460 +0100
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	2013-11-11 18:32:50.722147943 +0100
@@ -56,6 +56,7 @@
 #include "oops/oop.inline.hpp"
 #include "oops/oop.pcgc.inline.hpp"
 #include "runtime/vmThread.hpp"
+#include "utilities/ticks.hpp"
 
 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0;
 
@@ -1284,7 +1285,7 @@
   }
 
   STWGCTimer* gc_timer = G1MarkSweep::gc_timer();
-  gc_timer->register_gc_start(os::elapsed_counter());
+  gc_timer->register_gc_start();
 
   SerialOldTracer* gc_tracer = G1MarkSweep::gc_tracer();
   gc_tracer->report_gc_start(gc_cause(), gc_timer->gc_start());
@@ -1552,7 +1553,7 @@
 
     post_full_gc_dump(gc_timer);
 
-    gc_timer->register_gc_end(os::elapsed_counter());
+    gc_timer->register_gc_end();
     gc_tracer->report_gc_end(gc_timer->gc_end(), gc_timer->time_partitions());
   }
 
@@ -2482,7 +2483,7 @@
   FullGCCount_lock->notify_all();
 }
 
-void G1CollectedHeap::register_concurrent_cycle_start(jlong start_time) {
+void G1CollectedHeap::register_concurrent_cycle_start(const Ticks& start_time) {
   _concurrent_cycle_started = true;
   _gc_timer_cm->register_gc_start(start_time);
 
@@ -2496,7 +2497,7 @@
       _gc_tracer_cm->report_concurrent_mode_failure();
     }
 
-    _gc_timer_cm->register_gc_end(os::elapsed_counter());
+    _gc_timer_cm->register_gc_end();
     _gc_tracer_cm->report_gc_end(_gc_timer_cm->gc_end(), _gc_timer_cm->time_partitions());
 
     _concurrent_cycle_started = false;
@@ -3887,7 +3888,7 @@
     return false;
   }
 
-  _gc_timer_stw->register_gc_start(os::elapsed_counter());
+  _gc_timer_stw->register_gc_start();
 
   _gc_tracer_stw->report_gc_start(gc_cause(), _gc_timer_stw->gc_start());
 
@@ -4265,7 +4266,7 @@
 
     _gc_tracer_stw->report_evacuation_info(&evacuation_info);
     _gc_tracer_stw->report_tenuring_threshold(_g1_policy->tenuring_threshold());
-    _gc_timer_stw->register_gc_end(os::elapsed_counter());
+    _gc_timer_stw->register_gc_end();
     _gc_tracer_stw->report_gc_end(_gc_timer_stw->gc_end(), _gc_timer_stw->time_partitions());
   }
   // It should now be safe to tell the concurrent mark thread to start