--- old/src/share/vm/runtime/sweeper.cpp	2013-11-11 18:33:33.300764699 +0100
+++ new/src/share/vm/runtime/sweeper.cpp	2013-11-11 18:33:32.867748257 +0100
@@ -38,6 +38,7 @@
 #include "runtime/vm_operations.hpp"
 #include "trace/tracing.hpp"
 #include "utilities/events.hpp"
+#include "utilities/ticks.inline.hpp"
 #include "utilities/xmlstream.hpp"
 
 #ifdef ASSERT
@@ -142,11 +143,11 @@
 bool      NMethodSweeper::_request_mark_phase        = false;
 
 int       NMethodSweeper::_total_nof_methods_reclaimed = 0;
-jlong     NMethodSweeper::_total_time_sweeping         = 0;
-jlong     NMethodSweeper::_total_time_this_sweep       = 0;
-jlong     NMethodSweeper::_peak_sweep_time             = 0;
-jlong     NMethodSweeper::_peak_sweep_fraction_time    = 0;
-int       NMethodSweeper::_hotness_counter_reset_val   = 0;
+Tickspan  NMethodSweeper::_total_time_sweeping;
+Tickspan  NMethodSweeper::_total_time_this_sweep;
+Tickspan  NMethodSweeper::_peak_sweep_time;
+Tickspan  NMethodSweeper::_peak_sweep_fraction_time;
+int       NMethodSweeper::_hotness_counter_reset_val = 0;
 
 
 class MarkActivationClosure: public CodeBlobClosure {
@@ -204,7 +205,7 @@
     _invocations = NmethodSweepFraction;
     _current     = CodeCache::first_nmethod();
     _traversals  += 1;
-    _total_time_this_sweep = 0;
+    _total_time_this_sweep = Tickspan();
 
     if (PrintMethodFlushing) {
       tty->print_cr("### Sweep: stack traversal %d", _traversals);
@@ -252,7 +253,7 @@
 
 void NMethodSweeper::sweep_code_cache() {
 
-  jlong sweep_start_counter = os::elapsed_counter();
+  const Ticks sweep_start_counter = Ticks::now();
 
   _flushed_count   = 0;
   _zombified_count = 0;
@@ -328,8 +329,8 @@
     }
   }
 
-  jlong sweep_end_counter = os::elapsed_counter();
-  jlong sweep_time = sweep_end_counter - sweep_start_counter;
+  const Ticks sweep_end_counter = Ticks::now();
+  const Tickspan sweep_time = sweep_end_counter - sweep_start_counter;
   _total_time_sweeping  += sweep_time;
   _total_time_this_sweep += sweep_time;
   _peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time);
@@ -350,7 +351,7 @@
 
 #ifdef ASSERT
   if(PrintMethodFlushing) {
-    tty->print_cr("### sweeper:      sweep time(%d): " INT64_FORMAT, _invocations, (jlong)sweep_time);
+    tty->print_cr("### sweeper:      sweep time(%d): " INT64_FORMAT, _invocations, sweep_time.value());
   }
 #endif