--- old/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2020-02-17 17:22:56.492254231 +0800
+++ new/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2020-02-17 17:22:56.494254303 +0800
@@ -1209,8 +1209,6 @@
       ClassLoaderDataGraph::purge();
     }
 
-    _g1h->resize_heap_if_necessary();
-
     compute_new_sizes();
 
     verify_during_pause(G1HeapVerifier::G1VerifyRemark, VerifyOption_G1UsePrevMarking, "Remark after");
@@ -1382,6 +1380,11 @@
   // races with it goes around and waits for Cleanup to finish.
   _g1h->increment_total_collections();
 
+  {
+    GCTraceTime(Debug, gc, phases) debug("Expand heap after concurrent mark", _gc_timer_cm);
+    _g1h->expand_heap_after_concurrent_mark();
+  }
+
   // Local statistics
   double recent_cleanup_time = (os::elapsedTime() - start);
   _total_cleanup_time += recent_cleanup_time;