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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 2403:1927db75dd85
7024475: loop doesn't terminate when compiled
Reviewed-by: kvn
author | never |
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date | Sun, 27 Mar 2011 00:00:14 -0700 |
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342 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
27 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
28 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
29 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
1973 | 30 #include "gc_implementation/g1/vm_operations_g1.hpp" |
1972 | 31 #include "runtime/interfaceSupport.hpp" |
342 | 32 |
1973 | 33 VM_G1CollectForAllocation::VM_G1CollectForAllocation( |
34 unsigned int gc_count_before, | |
35 size_t word_size) | |
36 : VM_G1OperationWithAllocRequest(gc_count_before, word_size) { | |
37 guarantee(word_size > 0, "an allocation should always be requested"); | |
38 } | |
39 | |
342 | 40 void VM_G1CollectForAllocation::doit() { |
41 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1973 | 42 _result = g1h->satisfy_failed_allocation(_word_size, &_pause_succeeded); |
43 assert(_result == NULL || _pause_succeeded, | |
44 "if we get back a result, the pause should have succeeded"); | |
342 | 45 } |
46 | |
47 void VM_G1CollectFull::doit() { | |
48 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
49 GCCauseSetter x(g1h, _gc_cause); | |
50 g1h->do_full_collection(false /* clear_all_soft_refs */); | |
51 } | |
52 | |
1973 | 53 VM_G1IncCollectionPause::VM_G1IncCollectionPause( |
54 unsigned int gc_count_before, | |
55 size_t word_size, | |
56 bool should_initiate_conc_mark, | |
57 double target_pause_time_ms, | |
58 GCCause::Cause gc_cause) | |
59 : VM_G1OperationWithAllocRequest(gc_count_before, word_size), | |
60 _should_initiate_conc_mark(should_initiate_conc_mark), | |
61 _target_pause_time_ms(target_pause_time_ms), | |
62 _full_collections_completed_before(0) { | |
63 guarantee(target_pause_time_ms > 0.0, | |
64 err_msg("target_pause_time_ms = %1.6lf should be positive", | |
65 target_pause_time_ms)); | |
66 guarantee(word_size == 0 || gc_cause == GCCause::_g1_inc_collection_pause, | |
67 "we can only request an allocation if the GC cause is for " | |
68 "an incremental GC pause"); | |
69 _gc_cause = gc_cause; | |
70 } | |
71 | |
342 | 72 void VM_G1IncCollectionPause::doit() { |
73 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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74 assert(!_should_initiate_conc_mark || |
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75 ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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76 (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)), |
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77 "only a GC locker or a System.gc() induced GC should start a cycle"); |
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78 |
1973 | 79 if (_word_size > 0) { |
80 // An allocation has been requested. So, try to do that first. | |
81 _result = g1h->attempt_allocation_at_safepoint(_word_size, | |
82 false /* expect_null_cur_alloc_region */); | |
83 if (_result != NULL) { | |
84 // If we can successfully allocate before we actually do the | |
85 // pause then we will consider this pause successful. | |
86 _pause_succeeded = true; | |
87 return; | |
88 } | |
89 } | |
90 | |
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91 GCCauseSetter x(g1h, _gc_cause); |
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92 if (_should_initiate_conc_mark) { |
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93 // It's safer to read full_collections_completed() here, given |
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94 // that noone else will be updating it concurrently. Since we'll |
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95 // only need it if we're initiating a marking cycle, no point in |
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96 // setting it earlier. |
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97 _full_collections_completed_before = g1h->full_collections_completed(); |
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98 |
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99 // At this point we are supposed to start a concurrent cycle. We |
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100 // will do so if one is not already in progress. |
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101 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle(); |
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102 } |
1973 | 103 |
104 _pause_succeeded = | |
105 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms); | |
106 if (_pause_succeeded && _word_size > 0) { | |
107 // An allocation had been requested. | |
108 _result = g1h->attempt_allocation_at_safepoint(_word_size, | |
109 true /* expect_null_cur_alloc_region */); | |
110 } else { | |
111 assert(_result == NULL, "invariant"); | |
112 } | |
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113 } |
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114 |
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115 void VM_G1IncCollectionPause::doit_epilogue() { |
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116 VM_GC_Operation::doit_epilogue(); |
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117 |
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118 // If the pause was initiated by a System.gc() and |
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119 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle |
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120 // that just started (or maybe one that was already in progress) to |
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121 // finish. |
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122 if (_gc_cause == GCCause::_java_lang_system_gc && |
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123 _should_initiate_conc_mark) { |
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124 assert(ExplicitGCInvokesConcurrent, |
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125 "the only way to be here is if ExplicitGCInvokesConcurrent is set"); |
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126 |
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127 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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128 |
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129 // In the doit() method we saved g1h->full_collections_completed() |
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130 // in the _full_collections_completed_before field. We have to |
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131 // wait until we observe that g1h->full_collections_completed() |
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132 // has increased by at least one. This can happen if a) we started |
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133 // a cycle and it completes, b) a cycle already in progress |
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134 // completes, or c) a Full GC happens. |
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135 |
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136 // If the condition has already been reached, there's no point in |
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137 // actually taking the lock and doing the wait. |
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138 if (g1h->full_collections_completed() <= |
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139 _full_collections_completed_before) { |
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140 // The following is largely copied from CMS |
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141 |
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142 Thread* thr = Thread::current(); |
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143 assert(thr->is_Java_thread(), "invariant"); |
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144 JavaThread* jt = (JavaThread*)thr; |
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145 ThreadToNativeFromVM native(jt); |
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146 |
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147 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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148 while (g1h->full_collections_completed() <= |
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149 _full_collections_completed_before) { |
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150 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); |
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151 } |
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152 } |
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153 } |
342 | 154 } |
155 | |
156 void VM_CGC_Operation::doit() { | |
157 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
158 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
159 TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty); | |
160 SharedHeap* sh = SharedHeap::heap(); | |
161 // This could go away if CollectedHeap gave access to _gc_is_active... | |
162 if (sh != NULL) { | |
163 IsGCActiveMark x; | |
164 _cl->do_void(); | |
165 } else { | |
166 _cl->do_void(); | |
167 } | |
168 } | |
169 | |
170 bool VM_CGC_Operation::doit_prologue() { | |
171 Heap_lock->lock(); | |
172 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true; | |
173 return true; | |
174 } | |
175 | |
176 void VM_CGC_Operation::doit_epilogue() { | |
177 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false; | |
178 Heap_lock->unlock(); | |
179 } |