Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp @ 20357:4bfc44ba0d19
8055098: WB API should be extended to provide information about size and age of object.
Summary: Extend the WhiteBox API to provide information about the size and age of objects. Further add a mechanism to trigger a young GC.
Reviewed-by: tschatzl, sjohanss
Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
author | tschatzl |
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date | Thu, 21 Aug 2014 16:44:41 +0200 |
parents | a181f3a124dd |
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rev | line source |
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0 | 1 /* |
2225 | 2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP | |
27 | |
28 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp" | |
29 #include "gc_implementation/shared/vmGCOperations.hpp" | |
30 #include "gc_interface/gcCause.hpp" | |
31 #include "runtime/vm_operations.hpp" | |
32 | |
0 | 33 // The VM_CMS_Operation is slightly different from |
34 // a VM_GC_Operation -- and would not have subclassed easily | |
35 // to VM_GC_Operation without several changes to VM_GC_Operation. | |
36 // To minimize the changes, we have replicated some of the VM_GC_Operation | |
37 // functionality here. We will consolidate that back by doing subclassing | |
38 // as appropriate in Dolphin. | |
39 // | |
40 // VM_Operation | |
41 // VM_CMS_Operation | |
42 // - implements the common portion of work done in support | |
43 // of CMS' stop-world phases (initial mark and remark). | |
44 // | |
45 // VM_CMS_Initial_Mark | |
46 // VM_CMS_Final_Mark | |
47 // | |
48 | |
49 // Forward decl. | |
50 class CMSCollector; | |
51 | |
52 class VM_CMS_Operation: public VM_Operation { | |
53 protected: | |
54 CMSCollector* _collector; // associated collector | |
55 bool _prologue_succeeded; // whether doit_prologue succeeded | |
56 | |
57 bool lost_race() const; | |
58 | |
59 // java.lang.ref.Reference support | |
60 void acquire_pending_list_lock(); | |
61 void release_and_notify_pending_list_lock(); | |
62 | |
63 public: | |
64 VM_CMS_Operation(CMSCollector* collector): | |
65 _collector(collector), | |
66 _prologue_succeeded(false) {} | |
67 ~VM_CMS_Operation() {} | |
68 | |
69 // The legal collector state for executing this CMS op. | |
70 virtual const CMSCollector::CollectorState legal_state() const = 0; | |
71 | |
72 // Whether the pending list lock needs to be held | |
73 virtual const bool needs_pll() const = 0; | |
74 | |
75 // Execute operations in the context of the caller, | |
76 // prior to execution of the vm operation itself. | |
77 virtual bool doit_prologue(); | |
78 // Execute operations in the context of the caller, | |
79 // following completion of the vm operation. | |
80 virtual void doit_epilogue(); | |
81 | |
82 virtual bool evaluate_at_safepoint() const { return true; } | |
83 virtual bool is_cheap_allocated() const { return false; } | |
84 virtual bool allow_nested_vm_operations() const { return false; } | |
85 bool prologue_succeeded() const { return _prologue_succeeded; } | |
86 | |
87 void verify_before_gc(); | |
88 void verify_after_gc(); | |
89 }; | |
90 | |
91 | |
92 // VM_CMS_Operation for the initial marking phase of CMS. | |
93 class VM_CMS_Initial_Mark: public VM_CMS_Operation { | |
94 public: | |
95 VM_CMS_Initial_Mark(CMSCollector* _collector) : | |
96 VM_CMS_Operation(_collector) {} | |
97 | |
98 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; } | |
99 virtual void doit(); | |
100 | |
101 virtual const CMSCollector::CollectorState legal_state() const { | |
102 return CMSCollector::InitialMarking; | |
103 } | |
104 | |
105 virtual const bool needs_pll() const { | |
106 return false; | |
107 } | |
108 }; | |
109 | |
110 // VM_CMS_Operation for the final remark phase of CMS. | |
111 class VM_CMS_Final_Remark: public VM_CMS_Operation { | |
112 public: | |
113 VM_CMS_Final_Remark(CMSCollector* _collector) : | |
114 VM_CMS_Operation(_collector) {} | |
115 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; } | |
116 virtual void doit(); | |
117 | |
118 virtual const CMSCollector::CollectorState legal_state() const { | |
119 return CMSCollector::FinalMarking; | |
120 } | |
121 | |
122 virtual const bool needs_pll() const { | |
123 return true; | |
124 } | |
125 }; | |
126 | |
127 | |
128 // VM operation to invoke a concurrent collection of the heap as a | |
129 // GenCollectedHeap heap. | |
130 class VM_GenCollectFullConcurrent: public VM_GC_Operation { | |
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131 bool _disabled_icms; |
0 | 132 public: |
133 VM_GenCollectFullConcurrent(unsigned int gc_count_before, | |
134 unsigned int full_gc_count_before, | |
135 GCCause::Cause gc_cause) | |
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136 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */), |
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137 _disabled_icms(false) |
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138 { |
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139 assert(FullGCCount_lock != NULL, "Error"); |
0 | 140 assert(UseAsyncConcMarkSweepGC, "Else will hang caller"); |
141 } | |
142 ~VM_GenCollectFullConcurrent() {} | |
143 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; } | |
144 virtual void doit(); | |
145 virtual void doit_epilogue(); | |
146 virtual bool is_cheap_allocated() const { return false; } | |
147 virtual bool evaluate_at_safepoint() const; | |
148 }; | |
1972 | 149 |
150 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP |