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

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@@ -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.

@@ -29,12 +30,19 @@
  #include "gc/shenandoah/shenandoahHeap.inline.hpp"
  #include "runtime/os.hpp"
  
  ShenandoahCollectorPolicy::ShenandoahCollectorPolicy() :
    _success_concurrent_gcs(0),
+   _mixed_gcs(0),
+   _abbreviated_concurrent_gcs(0),
+   _abbreviated_degenerated_gcs(0),
+   _success_old_gcs(0),
+   _interrupted_old_gcs(0),
    _success_degenerated_gcs(0),
    _success_full_gcs(0),
+   _consecutive_young_gcs(0),
+   _consecutive_degenerated_gcs(0),
    _alloc_failure_degenerated(0),
    _alloc_failure_degenerated_upgrade_to_full(0),
    _alloc_failure_full(0),
    _explicit_concurrent(0),
    _explicit_full(0),

@@ -73,22 +81,59 @@
    _alloc_failure_degenerated++;
    _degen_points[point]++;
  }
  
  void ShenandoahCollectorPolicy::record_degenerated_upgrade_to_full() {
+   _consecutive_degenerated_gcs = 0;
    _alloc_failure_degenerated_upgrade_to_full++;
  }
  
- void ShenandoahCollectorPolicy::record_success_concurrent() {
+ void ShenandoahCollectorPolicy::record_success_concurrent(bool is_young, bool is_abbreviated) {
+   update_young(is_young);
+ 
+   _consecutive_degenerated_gcs = 0;
    _success_concurrent_gcs++;
+   if (is_abbreviated) {
+     _abbreviated_concurrent_gcs++;
+   }
+ }
+ 
+ void ShenandoahCollectorPolicy::record_mixed_cycle() {
+   _mixed_gcs++;
+ }
+ 
+ void ShenandoahCollectorPolicy::record_success_old() {
+   _consecutive_young_gcs = 0;
+   _success_old_gcs++;
+ }
+ 
+ void ShenandoahCollectorPolicy::record_interrupted_old() {
+   _consecutive_young_gcs = 0;
+   _interrupted_old_gcs++;
  }
  
- void ShenandoahCollectorPolicy::record_success_degenerated() {
+ void ShenandoahCollectorPolicy::record_success_degenerated(bool is_young, bool is_abbreviated) {
+   update_young(is_young);
+ 
    _success_degenerated_gcs++;
+   _consecutive_degenerated_gcs++;
+   if (is_abbreviated) {
+     _abbreviated_degenerated_gcs++;
+   }
+ }
+ 
+ void ShenandoahCollectorPolicy::update_young(bool is_young) {
+   if (is_young) {
+     _consecutive_young_gcs++;
+   } else {
+     _consecutive_young_gcs = 0;
+   }
  }
  
  void ShenandoahCollectorPolicy::record_success_full() {
+   _consecutive_degenerated_gcs = 0;
+   _consecutive_young_gcs = 0;
    _success_full_gcs++;
  }
  
  size_t ShenandoahCollectorPolicy::cycle_counter() const {
    return _cycle_counter;

@@ -108,30 +153,43 @@
  
  void ShenandoahCollectorPolicy::print_gc_stats(outputStream* out) const {
    out->print_cr("Under allocation pressure, concurrent cycles may cancel, and either continue cycle");
    out->print_cr("under stop-the-world pause or result in stop-the-world Full GC. Increase heap size,");
    out->print_cr("tune GC heuristics, set more aggressive pacing delay, or lower allocation rate");
-   out->print_cr("to avoid Degenerated and Full GC cycles.");
+   out->print_cr("to avoid Degenerated and Full GC cycles. Abbreviated cycles are those which found");
+   out->print_cr("enough regions with no live objects to skip evacuation.");
    out->cr();
  
-   out->print_cr(SIZE_FORMAT_W(5) " successful concurrent GCs",         _success_concurrent_gcs);
-   out->print_cr("  " SIZE_FORMAT_W(5) " invoked explicitly",           _explicit_concurrent);
-   out->print_cr("  " SIZE_FORMAT_W(5) " invoked implicitly",           _implicit_concurrent);
+   size_t completed_gcs = _success_full_gcs + _success_degenerated_gcs + _success_concurrent_gcs + _success_old_gcs;
+   out->print_cr(SIZE_FORMAT_W(5) " Completed GCs", completed_gcs);
+   out->print_cr(SIZE_FORMAT_W(5) " Successful Concurrent GCs (%.2f%%)",  _success_concurrent_gcs, percent_of(_success_concurrent_gcs, completed_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " invoked explicitly (%.2f%%)",    _explicit_concurrent, percent_of(_explicit_concurrent, _success_concurrent_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " invoked implicitly (%.2f%%)",    _implicit_concurrent, percent_of(_implicit_concurrent, _success_concurrent_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " abbreviated (%.2f%%)",           _abbreviated_concurrent_gcs, percent_of(_abbreviated_concurrent_gcs, _success_concurrent_gcs));
    out->cr();
  
-   out->print_cr(SIZE_FORMAT_W(5) " Degenerated GCs",                   _success_degenerated_gcs);
-   out->print_cr("  " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_degenerated);
+   if (ShenandoahHeap::heap()->mode()->is_generational()) {
+     out->print_cr(SIZE_FORMAT_W(5) " Completed Old GCs (%.2f%%)",        _success_old_gcs, percent_of(_success_old_gcs, completed_gcs));
+     out->print_cr("  " SIZE_FORMAT_W(5) " mixed",                        _mixed_gcs);
+     out->print_cr("  " SIZE_FORMAT_W(5) " interruptions",                _interrupted_old_gcs);
+     out->cr();
+   }
+ 
+   size_t degenerated_gcs = _alloc_failure_degenerated_upgrade_to_full + _success_degenerated_gcs;
+   out->print_cr(SIZE_FORMAT_W(5) " Degenerated GCs (%.2f%%)", degenerated_gcs, percent_of(degenerated_gcs, completed_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " upgraded to Full GC (%.2f%%)",          _alloc_failure_degenerated_upgrade_to_full, percent_of(_alloc_failure_degenerated_upgrade_to_full, degenerated_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " caused by allocation failure (%.2f%%)", _alloc_failure_degenerated, percent_of(_alloc_failure_degenerated, degenerated_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " abbreviated (%.2f%%)",                  _abbreviated_degenerated_gcs, percent_of(_abbreviated_degenerated_gcs, degenerated_gcs));
    for (int c = 0; c < ShenandoahGC::_DEGENERATED_LIMIT; c++) {
      if (_degen_points[c] > 0) {
        const char* desc = ShenandoahGC::degen_point_to_string((ShenandoahGC::ShenandoahDegenPoint)c);
        out->print_cr("    " SIZE_FORMAT_W(5) " happened at %s",         _degen_points[c], desc);
      }
    }
-   out->print_cr("  " SIZE_FORMAT_W(5) " upgraded to Full GC",          _alloc_failure_degenerated_upgrade_to_full);
    out->cr();
  
-   out->print_cr(SIZE_FORMAT_W(5) " Full GCs",                          _success_full_gcs + _alloc_failure_degenerated_upgrade_to_full);
-   out->print_cr("  " SIZE_FORMAT_W(5) " invoked explicitly",           _explicit_full);
-   out->print_cr("  " SIZE_FORMAT_W(5) " invoked implicitly",           _implicit_full);
-   out->print_cr("  " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_full);
-   out->print_cr("  " SIZE_FORMAT_W(5) " upgraded from Degenerated GC", _alloc_failure_degenerated_upgrade_to_full);
+   out->print_cr(SIZE_FORMAT_W(5) " Full GCs (%.2f%%)",                          _success_full_gcs, percent_of(_success_full_gcs, completed_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " invoked explicitly (%.2f%%)",           _explicit_full, percent_of(_explicit_full, _success_full_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " invoked implicitly (%.2f%%)",           _implicit_full, percent_of(_implicit_full, _success_full_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " caused by allocation failure (%.2f%%)", _alloc_failure_full, percent_of(_alloc_failure_full, _success_full_gcs));
+   out->print_cr("  " SIZE_FORMAT_W(5) " upgraded from Degenerated GC (%.2f%%)", _alloc_failure_degenerated_upgrade_to_full, percent_of(_alloc_failure_degenerated_upgrade_to_full, _success_full_gcs));
  }
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