src/hotspot/share/gc/shenandoah/shenandoahCollectorPolicy.hpp

@@ -1,7 +1,8 @@
  /*
   * Copyright (c) 2013, 2021, Red Hat, Inc. All rights reserved.
+  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.

@@ -43,10 +44,14 @@
    size_t _success_degenerated_gcs;
    size_t _abbreviated_degenerated_gcs;
    // Written by control thread, read by mutators
    volatile size_t _success_full_gcs;
    uint _consecutive_degenerated_gcs;
+   volatile size_t _consecutive_young_gcs;
+   size_t _mixed_gcs;
+   size_t _success_old_gcs;
+   size_t _interrupted_old_gcs;
    size_t _alloc_failure_degenerated;
    size_t _alloc_failure_degenerated_upgrade_to_full;
    size_t _alloc_failure_full;
    size_t _collection_cause_counts[GCCause::_last_gc_cause];
    size_t _degen_point_counts[ShenandoahGC::_DEGENERATED_LIMIT];

@@ -56,17 +61,21 @@
  
  
  public:
    ShenandoahCollectorPolicy();
  
+   void record_mixed_cycle();
+   void record_success_old();
+   void record_interrupted_old();
+ 
    // A collection cycle may be "abbreviated" if Shenandoah finds a sufficient percentage
    // of regions that contain no live objects (ShenandoahImmediateThreshold). These cycles
    // end after final mark, skipping the evacuation and reference-updating phases. Such
    // cycles are very efficient and are worth tracking. Note that both degenerated and
    // concurrent cycles can be abbreviated.
-   void record_success_concurrent(bool is_abbreviated);
-   void record_success_degenerated(bool is_abbreviated);
+   void record_success_concurrent(bool is_young, bool is_abbreviated);
+   void record_success_degenerated(bool is_young, bool is_abbreviated);
    void record_success_full();
    void record_alloc_failure_to_degenerated(ShenandoahGC::ShenandoahDegenPoint point);
    void record_alloc_failure_to_full();
    void record_degenerated_upgrade_to_full();
    void record_collection_cause(GCCause::Cause cause);

@@ -87,10 +96,18 @@
    // failure.
    inline size_t consecutive_degenerated_gc_count() const {
      return _consecutive_degenerated_gcs;
    }
  
+   static bool is_requested_gc(GCCause::Cause cause);
    static bool should_run_full_gc(GCCause::Cause cause);
    static bool should_handle_requested_gc(GCCause::Cause cause);
+ 
+   inline size_t consecutive_young_gc_count() const {
+     return _consecutive_young_gcs;
+   }
+ 
+ private:
+   void update_young(bool is_young);
  };
  
  #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP