1 /*
   2  * Copyright (c) 2001, 2015, 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
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  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_VM_OPERATIONS_G1_HPP
  26 #define SHARE_VM_GC_G1_VM_OPERATIONS_G1_HPP
  27 
  28 #include "gc/g1/g1AllocationContext.hpp"
  29 #include "gc/shared/gcId.hpp"
  30 #include "gc/shared/vmGCOperations.hpp"
  31 
  32 // VM_operations for the G1 collector.
  33 // VM_GC_Operation:
  34 //   - VM_CGC_Operation
  35 //   - VM_G1CollectFull
  36 //   - VM_G1OperationWithAllocRequest
  37 //     - VM_G1CollectForAllocation
  38 //     - VM_G1IncCollectionPause
  39 
  40 class VM_G1OperationWithAllocRequest : public VM_CollectForAllocation {
  41 protected:
  42   bool      _pause_succeeded;
  43   AllocationContext_t _allocation_context;
  44 
  45 public:
  46   VM_G1OperationWithAllocRequest(uint           gc_count_before,
  47                                  size_t         word_size,
  48                                  GCCause::Cause gc_cause)
  49     : VM_CollectForAllocation(word_size, gc_count_before, gc_cause),
  50       _pause_succeeded(false) {}
  51   bool pause_succeeded() { return _pause_succeeded; }
  52   void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }
  53   AllocationContext_t  allocation_context() { return _allocation_context; }
  54 };
  55 
  56 class VM_G1CollectFull: public VM_GC_Operation {
  57 public:
  58   VM_G1CollectFull(uint gc_count_before,
  59                    uint full_gc_count_before,
  60                    GCCause::Cause cause)
  61     : VM_GC_Operation(gc_count_before, cause, full_gc_count_before, true) { }
  62   virtual VMOp_Type type() const { return VMOp_G1CollectFull; }
  63   virtual void doit();
  64   virtual const char* name() const {
  65     return "full garbage-first collection";
  66   }
  67 };
  68 
  69 class VM_G1CollectForAllocation: public VM_G1OperationWithAllocRequest {
  70 public:
  71   VM_G1CollectForAllocation(uint         gc_count_before,
  72                             size_t       word_size);
  73   virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
  74   virtual void doit();
  75   virtual const char* name() const {
  76     return "garbage-first collection to satisfy allocation";
  77   }
  78 };
  79 
  80 class VM_G1IncCollectionPause: public VM_G1OperationWithAllocRequest {
  81 private:
  82   bool         _should_initiate_conc_mark;
  83   bool         _should_retry_gc;
  84   double       _target_pause_time_ms;
  85   uint         _old_marking_cycles_completed_before;
  86 public:
  87   VM_G1IncCollectionPause(uint           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 bool doit_prologue();
  94   virtual void doit();
  95   virtual void doit_epilogue();
  96   virtual const char* name() const {
  97     return "garbage-first incremental collection pause";
  98   }
  99   bool should_retry_gc() const { return _should_retry_gc; }
 100 };
 101 
 102 // Concurrent GC stop-the-world operations such as remark and cleanup;
 103 // consider sharing these with CMS's counterparts.
 104 class VM_CGC_Operation: public VM_Operation {
 105   VoidClosure* _cl;
 106   const char* _printGCMessage;
 107   bool _needs_pll;
 108   uint _gc_id;
 109 
 110 protected:
 111   // java.lang.ref.Reference support
 112   void acquire_pending_list_lock();
 113   void release_and_notify_pending_list_lock();
 114 
 115 public:
 116   VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg, bool needs_pll)
 117     : _cl(cl), _printGCMessage(printGCMsg), _needs_pll(needs_pll), _gc_id(GCId::current()) { }
 118   virtual VMOp_Type type() const { return VMOp_CGC_Operation; }
 119   virtual void doit();
 120   virtual bool doit_prologue();
 121   virtual void doit_epilogue();
 122   virtual const char* name() const {
 123     return "concurrent gc";
 124   }
 125 };
 126 
 127 #endif // SHARE_VM_GC_G1_VM_OPERATIONS_G1_HPP