1 /*
2 * Copyright (c) 2001, 2012, 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/g1/g1AllocationContext.hpp"
29 #include "gc_implementation/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_GC_Operation {
40 protected:
41 size_t _word_size;
42 HeapWord* _result;
43 bool _pause_succeeded;
44 AllocationContext_t _allocation_context;
45
46 public:
47 VM_G1OperationWithAllocRequest(unsigned int gc_count_before,
48 size_t word_size,
49 GCCause::Cause gc_cause)
50 : VM_GC_Operation(gc_count_before, gc_cause),
51 _word_size(word_size), _result(NULL), _pause_succeeded(false) { }
52 HeapWord* result() { return _result; }
53 bool pause_succeeded() { return _pause_succeeded; }
54 void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }
55 AllocationContext_t allocation_context() { return _allocation_context; }
56 };
57
58 class VM_G1CollectFull: public VM_GC_Operation {
59 public:
60 VM_G1CollectFull(unsigned int gc_count_before,
61 unsigned int full_gc_count_before,
62 GCCause::Cause cause)
63 : VM_GC_Operation(gc_count_before, cause, full_gc_count_before, true) { }
64 virtual VMOp_Type type() const { return VMOp_G1CollectFull; }
65 virtual void doit();
66 virtual const char* name() const {
67 return "full garbage-first collection";
68 }
69 };
70
71 class VM_G1CollectForAllocation: public VM_G1OperationWithAllocRequest {
72 public:
73 VM_G1CollectForAllocation(unsigned int gc_count_before,
74 size_t word_size);
75 virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
76 virtual void doit();
77 virtual const char* name() const {
78 return "garbage-first collection to satisfy allocation";
79 }
80 };
81
82 class VM_G1IncCollectionPause: public VM_G1OperationWithAllocRequest {
83 private:
84 bool _should_initiate_conc_mark;
85 bool _should_retry_gc;
86 double _target_pause_time_ms;
87 unsigned int _old_marking_cycles_completed_before;
88 public:
89 VM_G1IncCollectionPause(unsigned int gc_count_before,
90 size_t word_size,
91 bool should_initiate_conc_mark,
92 double target_pause_time_ms,
93 GCCause::Cause gc_cause);
94 virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }
95 virtual bool doit_prologue();
96 virtual void doit();
97 virtual void doit_epilogue();
98 virtual const char* name() const {
99 return "garbage-first incremental collection pause";
100 }
101 bool should_retry_gc() const { return _should_retry_gc; }
102 };
103
104 // Concurrent GC stop-the-world operations such as remark and cleanup;
105 // consider sharing these with CMS's counterparts.
106 class VM_CGC_Operation: public VM_Operation {
107 VoidClosure* _cl;
108 const char* _printGCMessage;
109 bool _needs_pll;
110
111 protected:
112 // java.lang.ref.Reference support
113 void acquire_pending_list_lock();
114 void release_and_notify_pending_list_lock();
115
116 public:
117 VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg, bool needs_pll)
118 : _cl(cl), _printGCMessage(printGCMsg), _needs_pll(needs_pll) { }
119 virtual VMOp_Type type() const { return VMOp_CGC_Operation; }
120 virtual void doit();
121 virtual bool doit_prologue();
122 virtual void doit_epilogue();
123 virtual const char* name() const {
124 return "concurrent gc";
125 }
126 };
127
128 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_VM_OPERATIONS_G1_HPP