src/hotspot/share/gc/g1/g1YoungRemSetSamplingThread.hpp

rev 52572 : JDK-8212657: Implementation of JDK-8204089 Promptly Return Unused Committed Memory from G1
Summary: Issue optional, default enabled, concurrent cycles when the VM is idle to reclaim unused internal and Java heap memory.
Reviewed-by:
Contributed-by: Rodrigo Bruno <rbruno@gsd.inesc-id.pt>, Ruslan Synytsky <rs@jelastic.com>, Thomas Schatzl <thomas.schatzl@oracle.com>
rev 52573 : [mq]: 8212657-stefanj-review

@@ -41,18 +41,24 @@
 // increase the young gen size to keep pause time length goal.
 class G1YoungRemSetSamplingThread: public ConcurrentGCThread {
 private:
   Monitor _monitor;
 
+  double _last_periodic_gc_attempt_s;
+
+  double _vtime_accum;  // Accumulated virtual time.
+
   void sample_young_list_rs_lengths();
 
   void run_service();
+  void check_for_periodic_gc();
+
   void stop_service();
 
   void sleep_before_next_cycle();
 
-  double _vtime_accum;  // Accumulated virtual time.
+  bool should_start_periodic_gc();
 
 public:
   G1YoungRemSetSamplingThread();
   double vtime_accum() { return _vtime_accum; }
 };