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

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  1 /*
  2  * Copyright (c) 2013, 2021, Red Hat, Inc. All rights reserved.

  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP
 26 #define SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP
 27 
 28 #include "gc/shared/gcTrace.hpp"
 29 #include "gc/shenandoah/shenandoahGC.hpp"
 30 #include "gc/shenandoah/shenandoahSharedVariables.hpp"

 31 #include "memory/allocation.hpp"
 32 #include "utilities/ostream.hpp"
 33 
 34 class ShenandoahTracer : public GCTracer, public CHeapObj<mtGC> {
 35 public:
 36   ShenandoahTracer() : GCTracer(Shenandoah) {}
 37 };
 38 
 39 class ShenandoahCollectorPolicy : public CHeapObj<mtGC> {
 40 private:
 41   size_t _success_concurrent_gcs;
 42   size_t _abbreviated_concurrent_gcs;
 43   size_t _success_degenerated_gcs;
 44   size_t _abbreviated_degenerated_gcs;
 45   // Written by control thread, read by mutators
 46   volatile size_t _success_full_gcs;
 47   uint _consecutive_degenerated_gcs;




 48   size_t _alloc_failure_degenerated;
 49   size_t _alloc_failure_degenerated_upgrade_to_full;
 50   size_t _alloc_failure_full;
 51   size_t _collection_cause_counts[GCCause::_last_gc_cause];
 52   size_t _degen_point_counts[ShenandoahGC::_DEGENERATED_LIMIT];
 53 
 54   ShenandoahSharedFlag _in_shutdown;
 55   ShenandoahTracer* _tracer;
 56 
 57 
 58 public:
 59   ShenandoahCollectorPolicy();
 60 




 61   // A collection cycle may be "abbreviated" if Shenandoah finds a sufficient percentage
 62   // of regions that contain no live objects (ShenandoahImmediateThreshold). These cycles
 63   // end after final mark, skipping the evacuation and reference-updating phases. Such
 64   // cycles are very efficient and are worth tracking. Note that both degenerated and
 65   // concurrent cycles can be abbreviated.
 66   void record_success_concurrent(bool is_abbreviated);
 67   void record_success_degenerated(bool is_abbreviated);
 68   void record_success_full();
 69   void record_alloc_failure_to_degenerated(ShenandoahGC::ShenandoahDegenPoint point);
 70   void record_alloc_failure_to_full();
 71   void record_degenerated_upgrade_to_full();
 72   void record_collection_cause(GCCause::Cause cause);
 73 
 74   void record_shutdown();
 75   bool is_at_shutdown();
 76 
 77   ShenandoahTracer* tracer() {return _tracer;}
 78 
 79   void print_gc_stats(outputStream* out) const;
 80 
 81   size_t full_gc_count() const {
 82     return _success_full_gcs + _alloc_failure_degenerated_upgrade_to_full;
 83   }
 84 
 85   // If the heuristics find that the number of consecutive degenerated cycles is above
 86   // ShenandoahFullGCThreshold, then they will initiate a Full GC upon an allocation
 87   // failure.
 88   inline size_t consecutive_degenerated_gc_count() const {
 89     return _consecutive_degenerated_gcs;
 90   }
 91 

 92   static bool should_run_full_gc(GCCause::Cause cause);
 93   static bool should_handle_requested_gc(GCCause::Cause cause);







 94 };
 95 
 96 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP

  1 /*
  2  * Copyright (c) 2013, 2021, Red Hat, Inc. All rights reserved.
  3  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
  4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  5  *
  6  * This code is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License version 2 only, as
  8  * published by the Free Software Foundation.
  9  *
 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
 15  *
 16  * You should have received a copy of the GNU General Public License version
 17  * 2 along with this work; if not, write to the Free Software Foundation,
 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 21  * or visit www.oracle.com if you need additional information or have any
 22  * questions.
 23  *
 24  */
 25 
 26 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP
 27 #define SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP
 28 
 29 #include "gc/shared/gcTrace.hpp"
 30 #include "gc/shenandoah/shenandoahGC.hpp"
 31 #include "gc/shenandoah/shenandoahSharedVariables.hpp"
 32 #include "gc/shenandoah/shenandoahTrace.hpp"
 33 #include "memory/allocation.hpp"
 34 #include "utilities/ostream.hpp"
 35 





 36 class ShenandoahCollectorPolicy : public CHeapObj<mtGC> {
 37 private:
 38   size_t _success_concurrent_gcs;
 39   size_t _abbreviated_concurrent_gcs;
 40   size_t _success_degenerated_gcs;
 41   size_t _abbreviated_degenerated_gcs;
 42   // Written by control thread, read by mutators
 43   volatile size_t _success_full_gcs;
 44   uint _consecutive_degenerated_gcs;
 45   volatile size_t _consecutive_young_gcs;
 46   size_t _mixed_gcs;
 47   size_t _success_old_gcs;
 48   size_t _interrupted_old_gcs;
 49   size_t _alloc_failure_degenerated;
 50   size_t _alloc_failure_degenerated_upgrade_to_full;
 51   size_t _alloc_failure_full;
 52   size_t _collection_cause_counts[GCCause::_last_gc_cause];
 53   size_t _degen_point_counts[ShenandoahGC::_DEGENERATED_LIMIT];
 54 
 55   ShenandoahSharedFlag _in_shutdown;
 56   ShenandoahTracer* _tracer;
 57 
 58 
 59 public:
 60   ShenandoahCollectorPolicy();
 61 
 62   void record_mixed_cycle();
 63   void record_success_old();
 64   void record_interrupted_old();
 65 
 66   // A collection cycle may be "abbreviated" if Shenandoah finds a sufficient percentage
 67   // of regions that contain no live objects (ShenandoahImmediateThreshold). These cycles
 68   // end after final mark, skipping the evacuation and reference-updating phases. Such
 69   // cycles are very efficient and are worth tracking. Note that both degenerated and
 70   // concurrent cycles can be abbreviated.
 71   void record_success_concurrent(bool is_young, bool is_abbreviated);
 72   void record_success_degenerated(bool is_young, bool is_abbreviated);
 73   void record_success_full();
 74   void record_alloc_failure_to_degenerated(ShenandoahGC::ShenandoahDegenPoint point);
 75   void record_alloc_failure_to_full();
 76   void record_degenerated_upgrade_to_full();
 77   void record_collection_cause(GCCause::Cause cause);
 78 
 79   void record_shutdown();
 80   bool is_at_shutdown();
 81 
 82   ShenandoahTracer* tracer() {return _tracer;}
 83 
 84   void print_gc_stats(outputStream* out) const;
 85 
 86   size_t full_gc_count() const {
 87     return _success_full_gcs + _alloc_failure_degenerated_upgrade_to_full;
 88   }
 89 
 90   // If the heuristics find that the number of consecutive degenerated cycles is above
 91   // ShenandoahFullGCThreshold, then they will initiate a Full GC upon an allocation
 92   // failure.
 93   inline size_t consecutive_degenerated_gc_count() const {
 94     return _consecutive_degenerated_gcs;
 95   }
 96 
 97   static bool is_requested_gc(GCCause::Cause cause);
 98   static bool should_run_full_gc(GCCause::Cause cause);
 99   static bool should_handle_requested_gc(GCCause::Cause cause);
100 
101   inline size_t consecutive_young_gc_count() const {
102     return _consecutive_young_gcs;
103   }
104 
105 private:
106   void update_young(bool is_young);
107 };
108 
109 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP
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