Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/vmGCOperations.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 |
|---|---|
| date | Mon, 28 Jun 2010 14:13:17 -0400 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2010, 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 | |
| 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 | |
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46 // VM_GenCollectForPermanentAllocation |
| 0 | 47 // VM_ParallelGCFailedAllocation |
| 48 // VM_ParallelGCFailedPermanentAllocation | |
| 49 // - this operation is invoked when allocation is failed; | |
| 50 // operation performs garbage collection and tries to | |
| 51 // allocate afterwards; | |
| 52 // | |
| 53 // VM_GenCollectFull | |
| 54 // VM_GenCollectFullConcurrent | |
| 55 // VM_ParallelGCSystemGC | |
| 56 // - these operations preform full collection of heaps of | |
| 57 // different kind | |
| 58 // | |
| 59 | |
| 60 class VM_GC_Operation: public VM_Operation { | |
| 61 protected: | |
| 62 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) | |
| 63 unsigned int _gc_count_before; // gc count before acquiring PLL | |
| 64 unsigned int _full_gc_count_before; // full gc count before acquiring PLL | |
| 65 bool _full; // whether a "full" collection | |
| 66 bool _prologue_succeeded; // whether doit_prologue succeeded | |
| 67 GCCause::Cause _gc_cause; // the putative cause for this gc op | |
| 68 bool _gc_locked; // will be set if gc was locked | |
| 69 | |
| 70 virtual bool skip_operation() const; | |
| 71 | |
| 72 // java.lang.ref.Reference support | |
| 73 void acquire_pending_list_lock(); | |
| 74 void release_and_notify_pending_list_lock(); | |
| 75 | |
| 76 public: | |
| 77 VM_GC_Operation(unsigned int gc_count_before, | |
| 78 unsigned int full_gc_count_before = 0, | |
| 79 bool full = false) { | |
| 80 _full = full; | |
| 81 _prologue_succeeded = false; | |
| 82 _gc_count_before = gc_count_before; | |
| 83 | |
| 84 // A subclass constructor will likely overwrite the following | |
| 85 _gc_cause = GCCause::_no_cause_specified; | |
| 86 | |
| 87 _gc_locked = false; | |
| 88 | |
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89 _full_gc_count_before = full_gc_count_before; |
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90 // In ParallelScavengeHeap::mem_allocate() collections can be |
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91 // executed within a loop and _all_soft_refs_clear can be set |
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92 // true after they have been cleared by a collection and another |
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93 // collection started so that _all_soft_refs_clear can be true |
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94 // when this collection is started. Don't assert that |
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95 // _all_soft_refs_clear have to be false here even though |
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96 // mutators have run. Soft refs will be cleared again in this |
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97 // collection. |
| 0 | 98 } |
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99 ~VM_GC_Operation() { |
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100 CollectedHeap* ch = Universe::heap(); |
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101 ch->collector_policy()->set_all_soft_refs_clear(false); |
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102 } |
| 0 | 103 |
| 104 // Acquire the reference synchronization lock | |
| 105 virtual bool doit_prologue(); | |
| 106 // Do notifyAll (if needed) and release held lock | |
| 107 virtual void doit_epilogue(); | |
| 108 | |
| 109 virtual bool allow_nested_vm_operations() const { return true; } | |
| 110 bool prologue_succeeded() const { return _prologue_succeeded; } | |
| 111 | |
| 112 void set_gc_locked() { _gc_locked = true; } | |
| 113 bool gc_locked() const { return _gc_locked; } | |
| 114 | |
| 115 static void notify_gc_begin(bool full = false); | |
| 116 static void notify_gc_end(); | |
| 117 }; | |
| 118 | |
| 119 | |
| 120 class VM_GC_HeapInspection: public VM_GC_Operation { | |
| 121 private: | |
| 122 outputStream* _out; | |
| 123 bool _full_gc; | |
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124 bool _need_prologue; |
| 0 | 125 public: |
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126 VM_GC_HeapInspection(outputStream* out, bool request_full_gc, |
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127 bool need_prologue) : |
| 0 | 128 VM_GC_Operation(0 /* total collections, dummy, ignored */, |
| 129 0 /* total full collections, dummy, ignored */, | |
| 130 request_full_gc) { | |
| 131 _out = out; | |
| 132 _full_gc = request_full_gc; | |
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133 _need_prologue = need_prologue; |
| 0 | 134 } |
| 135 | |
| 136 ~VM_GC_HeapInspection() {} | |
| 137 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } | |
| 138 virtual bool skip_operation() const; | |
| 139 virtual bool doit_prologue(); | |
| 140 virtual void doit(); | |
| 141 }; | |
| 142 | |
| 143 | |
| 144 class VM_GenCollectForAllocation: public VM_GC_Operation { | |
| 145 private: | |
| 146 HeapWord* _res; | |
| 147 size_t _size; // size of object to be allocated. | |
| 148 bool _tlab; // alloc is of a tlab. | |
| 149 public: | |
| 150 VM_GenCollectForAllocation(size_t size, | |
| 151 bool tlab, | |
| 152 unsigned int gc_count_before) | |
| 153 : VM_GC_Operation(gc_count_before), | |
| 154 _size(size), | |
| 155 _tlab(tlab) { | |
| 156 _res = NULL; | |
| 157 } | |
| 158 ~VM_GenCollectForAllocation() {} | |
| 159 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } | |
| 160 virtual void doit(); | |
| 161 HeapWord* result() const { return _res; } | |
| 162 }; | |
| 163 | |
| 164 | |
| 165 // VM operation to invoke a collection of the heap as a | |
| 166 // GenCollectedHeap heap. | |
| 167 class VM_GenCollectFull: public VM_GC_Operation { | |
| 168 private: | |
| 169 int _max_level; | |
| 170 public: | |
| 171 VM_GenCollectFull(unsigned int gc_count_before, | |
| 172 unsigned int full_gc_count_before, | |
| 173 GCCause::Cause gc_cause, | |
| 174 int max_level) | |
| 175 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */), | |
| 176 _max_level(max_level) | |
| 177 { _gc_cause = gc_cause; } | |
| 178 ~VM_GenCollectFull() {} | |
| 179 virtual VMOp_Type type() const { return VMOp_GenCollectFull; } | |
| 180 virtual void doit(); | |
| 181 }; | |
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182 |
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183 class VM_GenCollectForPermanentAllocation: public VM_GC_Operation { |
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184 private: |
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185 HeapWord* _res; |
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186 size_t _size; // size of object to be allocated |
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187 public: |
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188 VM_GenCollectForPermanentAllocation(size_t size, |
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189 unsigned int gc_count_before, |
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190 unsigned int full_gc_count_before, |
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191 GCCause::Cause gc_cause) |
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192 : VM_GC_Operation(gc_count_before, full_gc_count_before, true), |
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193 _size(size) { |
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194 _res = NULL; |
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195 _gc_cause = gc_cause; |
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196 } |
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197 ~VM_GenCollectForPermanentAllocation() {} |
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198 virtual VMOp_Type type() const { return VMOp_GenCollectForPermanentAllocation; } |
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199 virtual void doit(); |
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200 HeapWord* result() const { return _res; } |
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201 }; |