1 /*
   2  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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_VM_GC_IMPLEMENTATION_G1_VM_OPERATIONS_G1_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_VM_OPERATIONS_G1_HPP
  27 
  28 #include "gc_implementation/shared/vmGCOperations.hpp"
  29 
  30 // VM_operations for the G1 collector.
  31 // VM_GC_Operation:
  32 //   - VM_CGC_Operation
  33 //   - VM_G1CollectFull
  34 //   - VM_G1CollectForAllocation
  35 //   - VM_G1IncCollectionPause
  36 //   - VM_G1PopRegionCollectionPause
  37 
  38 class VM_G1CollectFull: public VM_GC_Operation {
  39  public:
  40   VM_G1CollectFull(unsigned int gc_count_before,
  41                    unsigned int full_gc_count_before,
  42                    GCCause::Cause cause)
  43     : VM_GC_Operation(gc_count_before, full_gc_count_before) {
  44     _gc_cause = cause;
  45   }
  46   ~VM_G1CollectFull() {}
  47   virtual VMOp_Type type() const { return VMOp_G1CollectFull; }
  48   virtual void doit();
  49   virtual const char* name() const {
  50     return "full garbage-first collection";
  51   }
  52 };
  53 
  54 class VM_G1CollectForAllocation: public VM_GC_Operation {
  55  private:
  56   HeapWord*   _res;
  57   size_t      _size;                       // size of object to be allocated
  58  public:
  59   VM_G1CollectForAllocation(size_t size, int gc_count_before)
  60     : VM_GC_Operation(gc_count_before) {
  61     _size        = size;
  62     _res         = NULL;
  63   }
  64   ~VM_G1CollectForAllocation()        {}
  65   virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
  66   virtual void doit();
  67   virtual const char* name() const {
  68     return "garbage-first collection to satisfy allocation";
  69   }
  70   HeapWord* result() { return _res; }
  71 };
  72 
  73 class VM_G1IncCollectionPause: public VM_GC_Operation {
  74 private:
  75   bool _should_initiate_conc_mark;
  76   double _target_pause_time_ms;
  77   unsigned int _full_collections_completed_before;
  78 public:
  79   VM_G1IncCollectionPause(unsigned int   gc_count_before,
  80                           bool           should_initiate_conc_mark,
  81                           double         target_pause_time_ms,
  82                           GCCause::Cause cause)
  83     : VM_GC_Operation(gc_count_before),
  84       _full_collections_completed_before(0),
  85       _should_initiate_conc_mark(should_initiate_conc_mark),
  86       _target_pause_time_ms(target_pause_time_ms) {
  87     guarantee(target_pause_time_ms > 0.0,
  88               err_msg("target_pause_time_ms = %1.6lf should be positive",
  89                       target_pause_time_ms));
  90 
  91     _gc_cause = cause;
  92   }
  93   virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }
  94   virtual void doit();
  95   virtual void doit_epilogue();
  96   virtual const char* name() const {
  97     return "garbage-first incremental collection pause";
  98   }
  99 };
 100 
 101 // Concurrent GC stop-the-world operations such as initial and final mark;
 102 // consider sharing these with CMS's counterparts.
 103 class VM_CGC_Operation: public VM_Operation {
 104   VoidClosure* _cl;
 105   const char* _printGCMessage;
 106  public:
 107   VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg) :
 108     _cl(cl),
 109     _printGCMessage(printGCMsg)
 110     {}
 111 
 112   ~VM_CGC_Operation() {}
 113 
 114   virtual VMOp_Type type() const { return VMOp_CGC_Operation; }
 115   virtual void doit();
 116   virtual bool doit_prologue();
 117   virtual void doit_epilogue();
 118   virtual const char* name() const {
 119     return "concurrent gc";
 120   }
 121 };
 122 
 123 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_VM_OPERATIONS_G1_HPP