1 /*
   2  * Copyright (c) 2013, 2015, Red Hat, Inc. and/or its affiliates.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAH_COLLECTOR_POLICY_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAH_COLLECTOR_POLICY_HPP
  26 
  27 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
  28 #include "gc/shenandoah/shenandoahHeapRegionSet.hpp"
  29 #include "gc/shared/gcTrace.hpp"
  30 #include "gc/shared/gcTimer.hpp"
  31 #include "gc/shared/collectorPolicy.hpp"
  32 #include "runtime/arguments.hpp"
  33 #include "utilities/numberSeq.hpp"
  34 
  35 
  36 class ShenandoahHeap;
  37 class ShenandoahHeuristics;
  38 
  39 class ShenandoahCollectorPolicy: public CollectorPolicy {
  40 
  41 public:
  42   enum TimingPhase {
  43     init_mark,
  44     final_mark,
  45     accumulate_stats,
  46     make_parsable,
  47     clear_liveness,
  48     scan_roots,
  49     rescan_roots,
  50     drain_satb,
  51     drain_queues,
  52     weakrefs,
  53     prepare_evac,
  54     init_evac,
  55 
  56     final_evac,
  57     final_uprefs,
  58     update_roots,
  59     recycle_regions,
  60     reset_bitmaps,
  61     resize_tlabs,
  62     full_gc,
  63     conc_mark,
  64     conc_evac,
  65     conc_uprefs,
  66 
  67     _num_phases
  68   };
  69 
  70 private:
  71   struct TimingData {
  72     NumberSeq _ms;
  73     double _start;
  74     size_t _count;
  75   };
  76 
  77 private:
  78   TimingData _timing_data[_num_phases];
  79   const char* _phase_names[_num_phases];
  80 
  81   size_t _user_requested_gcs;
  82   size_t _allocation_failure_gcs;
  83 
  84   ShenandoahHeap* _pgc;
  85   ShenandoahHeuristics* _heuristics;
  86   ShenandoahTracer* _tracer;
  87   STWGCTimer* _stw_timer;
  88   ConcurrentGCTimer* _conc_timer;
  89 
  90   bool _conc_gc_aborted;
  91 
  92 public:
  93   ShenandoahCollectorPolicy();
  94 
  95   virtual ShenandoahCollectorPolicy* as_pgc_policy();
  96 
  97   BarrierSet::Name barrier_set_name();
  98 
  99   HeapWord* mem_allocate_work(size_t size,
 100                               bool is_tlab,
 101                               bool* gc_overhead_limit_was_exceeded);
 102 
 103   HeapWord* satisfy_failed_allocation(size_t size, bool is_tlab);
 104 
 105   void initialize_alignments();
 106 
 107   void post_heap_initialize();
 108 
 109   void record_phase_start(TimingPhase phase);
 110   void record_phase_end(TimingPhase phase);
 111   void report_concgc_cancelled();
 112 
 113   void record_user_requested_gc();
 114   void record_allocation_failure_gc();
 115 
 116   void record_bytes_allocated(size_t bytes);
 117   void record_bytes_reclaimed(size_t bytes);
 118   void record_bytes_start_CM(size_t bytes);
 119   void record_bytes_end_CM(size_t bytes);
 120   bool should_start_concurrent_mark(size_t used, size_t capacity);
 121   void choose_collection_and_free_sets(ShenandoahHeapRegionSet* region_set,
 122                                        ShenandoahHeapRegionSet* collection_set,
 123                                        ShenandoahHeapRegionSet* free_set);
 124 
 125   bool update_refs_early();
 126 
 127   void print_tracing_info();
 128 
 129   GCTimer* conc_timer(){return _conc_timer;}
 130   GCTimer* stw_timer() {return _stw_timer;}
 131   ShenandoahTracer* tracer() {return _tracer;}
 132 
 133   void set_conc_gc_aborted() { _conc_gc_aborted = true;}
 134   void clear_conc_gc_aborted() {_conc_gc_aborted = false;}
 135 
 136 private:
 137   void print_summary_sd(const char* str, uint indent, const NumberSeq* seq);
 138 };
 139 
 140 
 141 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAH_COLLECTOR_POLICY_HPP