--- old/src/hotspot/share/gc/shared/genCollectedHeap.cpp	2020-07-23 16:59:12.658776213 +0200
+++ new/src/hotspot/share/gc/shared/genCollectedHeap.cpp	2020-07-23 16:59:12.542774448 +0200
@@ -1362,37 +1362,3 @@
   }
   return oop(result);
 }
-
-class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure {
-  jlong _time;   // in ms
-  jlong _now;    // in ms
-
- public:
-  GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { }
-
-  jlong time() { return _time; }
-
-  void do_generation(Generation* gen) {
-    _time = MIN2(_time, gen->time_of_last_gc(_now));
-  }
-};
-
-jlong GenCollectedHeap::millis_since_last_gc() {
-  // javaTimeNanos() is guaranteed to be monotonically non-decreasing
-  // provided the underlying platform provides such a time source
-  // (and it is bug free). So we still have to guard against getting
-  // back a time later than 'now'.
-  jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC;
-  GenTimeOfLastGCClosure tolgc_cl(now);
-  // iterate over generations getting the oldest
-  // time that a generation was collected
-  generation_iterate(&tolgc_cl, false);
-
-  jlong retVal = now - tolgc_cl.time();
-  if (retVal < 0) {
-    log_warning(gc)("millis_since_last_gc() would return : " JLONG_FORMAT
-       ". returning zero instead.", retVal);
-    return 0;
-  }
-  return retVal;
-}