1 /*
   2  * Copyright (c) 2001, 2011, 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_G1OperationWithAllocRequest
  35 //     - VM_G1CollectForAllocation
  36 //     - VM_G1IncCollectionPause
  37 
  38 class VM_G1OperationWithAllocRequest: public VM_GC_Operation {
  39 protected:
  40   size_t    _word_size;
  41   HeapWord* _result;
  42   bool      _pause_succeeded;
  43 
  44 public:
  45   VM_G1OperationWithAllocRequest(unsigned int gc_count_before,
  46                                  size_t       word_size)
  47     : VM_GC_Operation(gc_count_before),
  48       _word_size(word_size), _result(NULL), _pause_succeeded(false) {
  49     _gc_cause = GCCause::_allocation_failure;
  50   }
  51   HeapWord* result() { return _result; }
  52   bool pause_succeeded() { return _pause_succeeded; }
  53 };
  54 
  55 class VM_G1CollectFull: public VM_GC_Operation {
  56 public:
  57   VM_G1CollectFull(unsigned int gc_count_before,
  58                    unsigned int full_gc_count_before,
  59                    GCCause::Cause cause)
  60     : VM_GC_Operation(gc_count_before, full_gc_count_before) {
  61     _gc_cause = cause;
  62   }
  63   virtual VMOp_Type type() const { return VMOp_G1CollectFull; }
  64   virtual void doit();
  65   virtual const char* name() const {
  66     return "full garbage-first collection";
  67   }
  68 };
  69 
  70 class VM_G1CollectForAllocation: public VM_G1OperationWithAllocRequest {
  71 public:
  72   VM_G1CollectForAllocation(unsigned int gc_count_before,
  73                             size_t       word_size);
  74   virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
  75   virtual void doit();
  76   virtual const char* name() const {
  77     return "garbage-first collection to satisfy allocation";
  78   }
  79 };
  80 
  81 class VM_G1IncCollectionPause: public VM_G1OperationWithAllocRequest {
  82 private:
  83   bool         _should_initiate_conc_mark;
  84   double       _target_pause_time_ms;
  85   unsigned int _full_collections_completed_before;
  86 public:
  87   VM_G1IncCollectionPause(unsigned int   gc_count_before,
  88                           size_t         word_size,
  89                           bool           should_initiate_conc_mark,
  90                           double         target_pause_time_ms,
  91                           GCCause::Cause gc_cause);
  92   virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }
  93   virtual void doit();
  94   virtual void doit_epilogue();
  95   virtual const char* name() const {
  96     return "garbage-first incremental collection pause";
  97   }
  98 };
  99 
 100 // Concurrent GC stop-the-world operations such as initial and final mark;
 101 // consider sharing these with CMS's counterparts.
 102 class VM_CGC_Operation: public VM_Operation {
 103   VoidClosure* _cl;
 104   const char* _printGCMessage;
 105 public:
 106   VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg)
 107     : _cl(cl), _printGCMessage(printGCMsg) { }
 108   virtual VMOp_Type type() const { return VMOp_CGC_Operation; }
 109   virtual void doit();
 110   virtual bool doit_prologue();
 111   virtual void doit_epilogue();
 112   virtual const char* name() const {
 113     return "concurrent gc";
 114   }
 115 };
 116 
 117 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_VM_OPERATIONS_G1_HPP