--- old/src/hotspot/share/gc/parallel/psParallelCompact.cpp	2020-08-07 13:15:59.762046247 +0200
+++ new/src/hotspot/share/gc/parallel/psParallelCompact.cpp	2020-08-07 13:15:59.638044277 +0200
@@ -843,7 +843,6 @@
 elapsedTimer        PSParallelCompact::_accumulated_time;
 unsigned int        PSParallelCompact::_total_invocations = 0;
 unsigned int        PSParallelCompact::_maximum_compaction_gc_num = 0;
-jlong               PSParallelCompact::_time_of_last_gc = 0;
 CollectorCounters*  PSParallelCompact::_counters = NULL;
 ParMarkBitMap       PSParallelCompact::_mark_bitmap;
 ParallelCompactData PSParallelCompact::_summary_data;
@@ -1070,8 +1069,8 @@
     heap->gen_mangle_unused_area();
   }
 
-  // Update time of last GC
-  reset_millis_since_last_gc();
+  // Signal that we have completed a visit to all live objects.
+  Universe::heap()->record_whole_heap_examined_timestamp();
 }
 
 HeapWord*
@@ -3197,25 +3196,6 @@
   }
 }
 
-jlong PSParallelCompact::millis_since_last_gc() {
-  // We need a monotonically non-decreasing time in ms but
-  // os::javaTimeMillis() does not guarantee monotonicity.
-  jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC;
-  jlong ret_val = now - _time_of_last_gc;
-  // XXX See note in genCollectedHeap::millis_since_last_gc().
-  if (ret_val < 0) {
-    NOT_PRODUCT(log_warning(gc)("time warp: " JLONG_FORMAT, ret_val);)
-    return 0;
-  }
-  return ret_val;
-}
-
-void PSParallelCompact::reset_millis_since_last_gc() {
-  // We need a monotonically non-decreasing time in ms but
-  // os::javaTimeMillis() does not guarantee monotonicity.
-  _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC;
-}
-
 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full()
 {
   if (source() != copy_destination()) {