1 /*
   2  * Copyright (c) 2013, 2018, Red Hat, Inc. All rights reserved.
   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_SHENANDOAHCOLLECTORPOLICY_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP
  26 
  27 #include "memory/collectorPolicy.hpp"
  28 #include "gc_implementation/shared/gcTrace.hpp"
  29 #include "gc_implementation/shenandoah/shenandoahHeap.hpp"
  30 #include "utilities/ostream.hpp"
  31 
  32 class STWGCTimer;
  33 class ConcurrentGCTimer;
  34 
  35 class ShenandoahTracer : public GCTracer {
  36 public:
  37   ShenandoahTracer() : GCTracer(Shenandoah) {}
  38 };
  39 
  40 class ShenandoahCollectorPolicy: public CollectorPolicy {
  41 private:
  42   size_t _success_concurrent_gcs;
  43   size_t _success_degenerated_gcs;
  44   size_t _success_full_gcs;
  45   size_t _alloc_failure_degenerated;
  46   size_t _alloc_failure_degenerated_upgrade_to_full;
  47   size_t _alloc_failure_full;
  48   size_t _explicit_concurrent;
  49   size_t _explicit_full;
  50   size_t _implicit_concurrent;
  51   size_t _implicit_full;
  52   size_t _degen_points[ShenandoahHeap::_DEGENERATED_LIMIT];
  53 
  54   ShenandoahSharedFlag _in_shutdown;
  55 
  56   ShenandoahTracer* _tracer;
  57 
  58   size_t _cycle_counter;
  59 
  60 public:
  61   ShenandoahCollectorPolicy();
  62 
  63   void post_heap_initialize() {};
  64 
  65   BarrierSet::Name barrier_set_name();
  66 
  67   HeapWord* mem_allocate_work(size_t size,
  68                               bool is_tlab,
  69                               bool* gc_overhead_limit_was_exceeded);
  70 
  71   HeapWord* satisfy_failed_allocation(size_t size, bool is_tlab);
  72 
  73   MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
  74                                                size_t size,
  75                                                Metaspace::MetadataType mdtype);
  76 
  77   void initialize_alignments();
  78 
  79   // TODO: This is different from gc_end: that one encompasses one VM operation.
  80   // These two encompass the entire cycle.
  81   void record_cycle_start();
  82 
  83   void record_success_concurrent();
  84   void record_success_degenerated();
  85   void record_success_full();
  86   void record_alloc_failure_to_degenerated(ShenandoahHeap::ShenandoahDegenPoint point);
  87   void record_alloc_failure_to_full();
  88   void record_degenerated_upgrade_to_full();
  89   void record_explicit_to_concurrent();
  90   void record_explicit_to_full();
  91   void record_implicit_to_concurrent();
  92   void record_implicit_to_full();
  93 
  94   void record_shutdown();
  95   bool is_at_shutdown();
  96 
  97   ShenandoahTracer* tracer() {return _tracer;}
  98 
  99   size_t cycle_counter() const;
 100 
 101   void print_gc_stats(outputStream* out) const;
 102 };
 103 
 104 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTORPOLICY_HPP