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comparison src/share/vm/gc_implementation/shared/vmGCOperations.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // The following class hierarchy represents
26 // a set of operations (VM_Operation) related to GC.
27 //
28 // VM_Operation
29 // VM_GC_Operation
30 // VM_GC_HeapInspection
31 // VM_GenCollectForAllocation
32 // VM_GenCollectFull
33 // VM_GenCollectFullConcurrent
34 // VM_ParallelGCFailedAllocation
35 // VM_ParallelGCFailedPermanentAllocation
36 // VM_ParallelGCSystemGC
37 // VM_GC_Operation
38 // - implements methods common to all classes in the hierarchy:
39 // prevents multiple gc requests and manages lock on heap;
40 //
41 // VM_GC_HeapInspection
42 // - prints class histogram on SIGBREAK if PrintClassHistogram
43 // is specified; and also the attach "inspectheap" operation
44 //
45 // VM_GenCollectForAllocation
46 // VM_ParallelGCFailedAllocation
47 // VM_ParallelGCFailedPermanentAllocation
48 // - this operation is invoked when allocation is failed;
49 // operation performs garbage collection and tries to
50 // allocate afterwards;
51 //
52 // VM_GenCollectFull
53 // VM_GenCollectFullConcurrent
54 // VM_ParallelGCSystemGC
55 // - these operations preform full collection of heaps of
56 // different kind
57 //
58
59 class VM_GC_Operation: public VM_Operation {
60 protected:
61 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
62 unsigned int _gc_count_before; // gc count before acquiring PLL
63 unsigned int _full_gc_count_before; // full gc count before acquiring PLL
64 bool _full; // whether a "full" collection
65 bool _prologue_succeeded; // whether doit_prologue succeeded
66 GCCause::Cause _gc_cause; // the putative cause for this gc op
67 bool _gc_locked; // will be set if gc was locked
68
69 virtual bool skip_operation() const;
70
71 // java.lang.ref.Reference support
72 void acquire_pending_list_lock();
73 void release_and_notify_pending_list_lock();
74
75 public:
76 VM_GC_Operation(unsigned int gc_count_before,
77 unsigned int full_gc_count_before = 0,
78 bool full = false) {
79 _full = full;
80 _prologue_succeeded = false;
81 _gc_count_before = gc_count_before;
82
83 // A subclass constructor will likely overwrite the following
84 _gc_cause = GCCause::_no_cause_specified;
85
86 _gc_locked = false;
87
88 if (full) {
89 _full_gc_count_before = full_gc_count_before;
90 }
91 }
92 ~VM_GC_Operation() {}
93
94 // Acquire the reference synchronization lock
95 virtual bool doit_prologue();
96 // Do notifyAll (if needed) and release held lock
97 virtual void doit_epilogue();
98
99 virtual bool allow_nested_vm_operations() const { return true; }
100 bool prologue_succeeded() const { return _prologue_succeeded; }
101
102 void set_gc_locked() { _gc_locked = true; }
103 bool gc_locked() const { return _gc_locked; }
104
105 static void notify_gc_begin(bool full = false);
106 static void notify_gc_end();
107 };
108
109
110 class VM_GC_HeapInspection: public VM_GC_Operation {
111 private:
112 outputStream* _out;
113 bool _full_gc;
114 public:
115 VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
116 VM_GC_Operation(0 /* total collections, dummy, ignored */,
117 0 /* total full collections, dummy, ignored */,
118 request_full_gc) {
119 _out = out;
120 _full_gc = request_full_gc;
121 }
122
123 ~VM_GC_HeapInspection() {}
124 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
125 virtual bool skip_operation() const;
126 virtual bool doit_prologue();
127 virtual void doit();
128 };
129
130
131 class VM_GenCollectForAllocation: public VM_GC_Operation {
132 private:
133 HeapWord* _res;
134 size_t _size; // size of object to be allocated.
135 bool _tlab; // alloc is of a tlab.
136 public:
137 VM_GenCollectForAllocation(size_t size,
138 bool tlab,
139 unsigned int gc_count_before)
140 : VM_GC_Operation(gc_count_before),
141 _size(size),
142 _tlab(tlab) {
143 _res = NULL;
144 }
145 ~VM_GenCollectForAllocation() {}
146 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
147 virtual void doit();
148 HeapWord* result() const { return _res; }
149 };
150
151
152 // VM operation to invoke a collection of the heap as a
153 // GenCollectedHeap heap.
154 class VM_GenCollectFull: public VM_GC_Operation {
155 private:
156 int _max_level;
157 public:
158 VM_GenCollectFull(unsigned int gc_count_before,
159 unsigned int full_gc_count_before,
160 GCCause::Cause gc_cause,
161 int max_level)
162 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */),
163 _max_level(max_level)
164 { _gc_cause = gc_cause; }
165 ~VM_GenCollectFull() {}
166 virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
167 virtual void doit();
168 };