--- old/src/hotspot/share/gc/g1/g1OldGenAllocationTracker.cpp	2020-08-11 02:05:05.337104625 +0000
+++ new/src/hotspot/share/gc/g1/g1OldGenAllocationTracker.cpp	2020-08-11 02:05:05.077099513 +0000
@@ -24,19 +24,27 @@
 
 #include "precompiled.hpp"
 #include "gc/g1/g1OldGenAllocationTracker.hpp"
+#include "logging/log.hpp"
 
 G1OldGenAllocationTracker::G1OldGenAllocationTracker() :
-  _last_cycle_old_bytes(0),
-  _last_cycle_duration(0.0),
-  _allocated_bytes_since_last_gc(0) {
+  _last_period_old_bytes(0),
+  _last_period_humongous_bytes(0),
+  _humongous_bytes_after_last_gc(0),
+  _humongous_bytes_after_penultimate_gc(0),
+  _allocated_bytes_since_last_gc(0),
+  _allocated_humongous_bytes_since_last_gc(0) {
 }
 
-void G1OldGenAllocationTracker::reset_after_full_gc() {
-  _last_cycle_duration = 0;
-  reset_cycle_after_gc();
+void G1OldGenAllocationTracker::reset_after_gc(size_t humongous_bytes_after_gc) {
+  // Record last
+  _last_period_old_bytes = _allocated_bytes_since_last_gc;
+  _last_period_humongous_bytes = _allocated_humongous_bytes_since_last_gc;
+  _humongous_bytes_after_penultimate_gc = _humongous_bytes_after_last_gc;
+  _humongous_bytes_after_last_gc = humongous_bytes_after_gc;
+  // Reset
+  _allocated_bytes_since_last_gc = 0;
+  _allocated_humongous_bytes_since_last_gc = 0;
+  log_debug(gc, alloc, stats)("Old generation allocation in the last mutator period, "
+                              "old gen allocated: " SIZE_FORMAT "B, humongous allocated: " SIZE_FORMAT "B.",
+                              _last_period_old_bytes, _last_period_humongous_bytes);
 }
-
-void G1OldGenAllocationTracker::reset_after_young_gc(double allocation_duration_s) {
-  _last_cycle_duration = allocation_duration_s;
-  reset_cycle_after_gc();
-}
\ No newline at end of file