--- old/src/hotspot/share/gc/g1/g1Policy.cpp	2020-02-17 17:22:57.008272821 +0800
+++ new/src/hotspot/share/gc/g1/g1Policy.cpp	2020-02-17 17:22:57.010272893 +0800
@@ -679,6 +679,9 @@
     _analytics->compute_pause_time_ratio(interval_ms, pause_time_ms);
   }
 
+  if (collector_state()->finish_of_mixed_gc()) {
+    collector_state()->set_finish_of_mixed_gc(false);
+  }
   if (collector_state()->in_young_gc_before_mixed()) {
     assert(!this_pause_included_initial_mark, "The young GC before mixed is not allowed to be an initial mark GC");
     // This has been the young GC before we start doing mixed GCs. We already
@@ -692,6 +695,7 @@
     if (!next_gc_should_be_mixed("continue mixed GCs",
                                  "do not continue mixed GCs")) {
       collector_state()->set_in_young_only_phase(true);
+      collector_state()->set_finish_of_mixed_gc(true);
 
       clear_collection_set_candidates();
       maybe_start_marking();
@@ -1411,3 +1415,10 @@
   // the survivor regions from this evacuation pause as 'young'
   // at the start of the next.
 }
+
+size_t G1Policy::minimum_desired_bytes_after_concurrent_mark(size_t used_bytes) {
+  size_t minimum_desired_buffer_size = _ihop_control->predict_unstrained_buffer_size();
+  return minimum_desired_buffer_size != 0 ?
+           minimum_desired_buffer_size : _young_list_max_length * HeapRegion::GrainBytes
+         + _reserve_regions * HeapRegion::GrainBytes + used_bytes;
+}