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

    21  * questions.

    22  *

    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/vmGCOperations.hpp"

    30 

    31 // VM_operations for the G1 collector.

    32 // VM_GC_Operation:

    33 //   - VM_CGC_Operation

    34 //   - VM_G1CollectFull

    35 //   - VM_G1OperationWithAllocRequest

    36 //     - VM_G1CollectForAllocation

    37 //     - VM_G1IncCollectionPause

    38 

    39 class VM_G1OperationWithAllocRequest : public VM_CollectForAllocation {

    40 protected:

    41   bool      _pause_succeeded;

    42   AllocationContext_t _allocation_context;

    43 

    44 public:

    45   VM_G1OperationWithAllocRequest(uint           gc_count_before,

    46                                  size_t         word_size,

    47                                  GCCause::Cause gc_cause)

    48     : VM_CollectForAllocation(word_size, gc_count_before, gc_cause),

    49       _pause_succeeded(false) {}

    50   bool pause_succeeded() { return _pause_succeeded; }

    51   void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }

    52   AllocationContext_t  allocation_context() { return _allocation_context; }

    53 };

    54 

    55 class VM_G1CollectFull: public VM_GC_Operation {

    56 public:

    57   VM_G1CollectFull(uint gc_count_before,

    58                    uint full_gc_count_before,

    59                    GCCause::Cause cause)

    60     : VM_GC_Operation(gc_count_before, cause, full_gc_count_before, true) { }

    61   virtual VMOp_Type type() const { return VMOp_G1CollectFull; }

    62   virtual void doit();

    63   virtual const char* name() const {

    64     return "full garbage-first collection";

    65   }

    66 };

    67 

    68 class VM_G1CollectForAllocation: public VM_G1OperationWithAllocRequest {

    69 public:

    70   VM_G1CollectForAllocation(uint         gc_count_before,

    71                             size_t       word_size);

    72   virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }

    73   virtual void doit();

    74   virtual const char* name() const {

    75     return "garbage-first collection to satisfy allocation";

    76   }

    77 };

    78 

    79 class VM_G1IncCollectionPause: public VM_G1OperationWithAllocRequest {

    80 private:

    81   bool         _should_initiate_conc_mark;

    82   bool         _should_retry_gc;

    83   double       _target_pause_time_ms;

    84   uint         _old_marking_cycles_completed_before;

    85 public:

    86   VM_G1IncCollectionPause(uint           gc_count_before,

    87                           size_t         word_size,

    88                           bool           should_initiate_conc_mark,

    89                           double         target_pause_time_ms,

    90                           GCCause::Cause gc_cause);

    91   virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }

    92   virtual bool doit_prologue();

    93   virtual void doit();

    94   virtual void doit_epilogue();

    95   virtual const char* name() const {

    96     return "garbage-first incremental collection pause";

    97   }

    98   bool should_retry_gc() const { return _should_retry_gc; }

    99 };

   100 

   101 // Concurrent GC stop-the-world operations such as remark and cleanup;

   102 // consider sharing these with CMS's counterparts.

   103 class VM_CGC_Operation: public VM_Operation {

   104   VoidClosure* _cl;

   105   const char* _printGCMessage;

   106   bool _needs_pll;

   107 

   108 protected:

   109   // java.lang.ref.Reference support

   110   void acquire_pending_list_lock();

   111   void release_and_notify_pending_list_lock();

   112 

   113 public:

   114   VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg, bool needs_pll)

   115     : _cl(cl), _printGCMessage(printGCMsg), _needs_pll(needs_pll) { }

   116   virtual VMOp_Type type() const { return VMOp_CGC_Operation; }

   117   virtual void doit();

   118   virtual bool doit_prologue();

   119   virtual void doit_epilogue();

   120   virtual const char* name() const {

   121     return "concurrent gc";

   122   }

   123 };

   124 

   125 #endif // SHARE_VM_GC_G1_VM_OPERATIONS_G1_HPP