Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * This code is free software; you can redistribute it and/or modify it | |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
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12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
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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 |
c18cbe5936b8
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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 | |
25 // The VM_CMS_Operation is slightly different from | |
26 // a VM_GC_Operation -- and would not have subclassed easily | |
27 // to VM_GC_Operation without several changes to VM_GC_Operation. | |
28 // To minimize the changes, we have replicated some of the VM_GC_Operation | |
29 // functionality here. We will consolidate that back by doing subclassing | |
30 // as appropriate in Dolphin. | |
31 // | |
32 // VM_Operation | |
33 // VM_CMS_Operation | |
34 // - implements the common portion of work done in support | |
35 // of CMS' stop-world phases (initial mark and remark). | |
36 // | |
37 // VM_CMS_Initial_Mark | |
38 // VM_CMS_Final_Mark | |
39 // | |
40 | |
41 // Forward decl. | |
42 class CMSCollector; | |
43 | |
44 class VM_CMS_Operation: public VM_Operation { | |
45 protected: | |
46 CMSCollector* _collector; // associated collector | |
47 bool _prologue_succeeded; // whether doit_prologue succeeded | |
48 | |
49 bool lost_race() const; | |
50 | |
51 // java.lang.ref.Reference support | |
52 void acquire_pending_list_lock(); | |
53 void release_and_notify_pending_list_lock(); | |
54 | |
55 public: | |
56 VM_CMS_Operation(CMSCollector* collector): | |
57 _collector(collector), | |
58 _prologue_succeeded(false) {} | |
59 ~VM_CMS_Operation() {} | |
60 | |
61 // The legal collector state for executing this CMS op. | |
62 virtual const CMSCollector::CollectorState legal_state() const = 0; | |
63 | |
64 // Whether the pending list lock needs to be held | |
65 virtual const bool needs_pll() const = 0; | |
66 | |
67 // Execute operations in the context of the caller, | |
68 // prior to execution of the vm operation itself. | |
69 virtual bool doit_prologue(); | |
70 // Execute operations in the context of the caller, | |
71 // following completion of the vm operation. | |
72 virtual void doit_epilogue(); | |
73 | |
74 virtual bool evaluate_at_safepoint() const { return true; } | |
75 virtual bool is_cheap_allocated() const { return false; } | |
76 virtual bool allow_nested_vm_operations() const { return false; } | |
77 bool prologue_succeeded() const { return _prologue_succeeded; } | |
78 | |
79 void verify_before_gc(); | |
80 void verify_after_gc(); | |
81 }; | |
82 | |
83 | |
84 // VM_CMS_Operation for the initial marking phase of CMS. | |
85 class VM_CMS_Initial_Mark: public VM_CMS_Operation { | |
86 public: | |
87 VM_CMS_Initial_Mark(CMSCollector* _collector) : | |
88 VM_CMS_Operation(_collector) {} | |
89 | |
90 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; } | |
91 virtual void doit(); | |
92 | |
93 virtual const CMSCollector::CollectorState legal_state() const { | |
94 return CMSCollector::InitialMarking; | |
95 } | |
96 | |
97 virtual const bool needs_pll() const { | |
98 return false; | |
99 } | |
100 }; | |
101 | |
102 // VM_CMS_Operation for the final remark phase of CMS. | |
103 class VM_CMS_Final_Remark: public VM_CMS_Operation { | |
104 public: | |
105 VM_CMS_Final_Remark(CMSCollector* _collector) : | |
106 VM_CMS_Operation(_collector) {} | |
107 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; } | |
108 virtual void doit(); | |
109 | |
110 virtual const CMSCollector::CollectorState legal_state() const { | |
111 return CMSCollector::FinalMarking; | |
112 } | |
113 | |
114 virtual const bool needs_pll() const { | |
115 return true; | |
116 } | |
117 }; | |
118 | |
119 | |
120 // VM operation to invoke a concurrent collection of the heap as a | |
121 // GenCollectedHeap heap. | |
122 class VM_GenCollectFullConcurrent: public VM_GC_Operation { | |
123 public: | |
124 VM_GenCollectFullConcurrent(unsigned int gc_count_before, | |
125 unsigned int full_gc_count_before, | |
126 GCCause::Cause gc_cause) | |
127 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */) { | |
128 _gc_cause = gc_cause; | |
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6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
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129 assert(FullGCCount_lock != NULL, "Error"); |
0 | 130 assert(UseAsyncConcMarkSweepGC, "Else will hang caller"); |
131 } | |
132 ~VM_GenCollectFullConcurrent() {} | |
133 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; } | |
134 virtual void doit(); | |
135 virtual void doit_epilogue(); | |
136 virtual bool is_cheap_allocated() const { return false; } | |
137 virtual bool evaluate_at_safepoint() const; | |
138 }; |