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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 3777:e8b0b0392037

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7046182: G1: remove unnecessary iterations over the collection set Summary: Remove two unnecessary iterations over the collection set which are supposed to prepare the RSet's of the CSet regions for parallel iterations (we'll make sure this is done incrementally). I'll piggyback on this CR the removal of the G1_REM_SET_LOGGING code. Reviewed-by: brutisso, johnc
author tonyp
date Tue, 21 Jun 2011 15:23:07 -0400
parents 5130fa1b24f1
children 20213c8a3c40
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1 /*
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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27 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
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28 #include "gc_implementation/g1/vm_operations_g1.hpp"
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29 #include "gc_implementation/shared/isGCActiveMark.hpp"
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30 #include "gc_implementation/g1/vm_operations_g1.hpp"
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31 #include "runtime/interfaceSupport.hpp"
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32
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33 VM_G1CollectForAllocation::VM_G1CollectForAllocation(
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34 unsigned int gc_count_before,
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35 size_t word_size)
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36 : VM_G1OperationWithAllocRequest(gc_count_before, word_size) {
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37 guarantee(word_size > 0, "an allocation should always be requested");
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38 }
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39
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40 void VM_G1CollectForAllocation::doit() {
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41 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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42 _result = g1h->satisfy_failed_allocation(_word_size, &_pause_succeeded);
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43 assert(_result == NULL || _pause_succeeded,
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44 "if we get back a result, the pause should have succeeded");
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45 }
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46
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47 void VM_G1CollectFull::doit() {
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48 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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49 GCCauseSetter x(g1h, _gc_cause);
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50 g1h->do_full_collection(false /* clear_all_soft_refs */);
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51 }
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52
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53 VM_G1IncCollectionPause::VM_G1IncCollectionPause(
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54 unsigned int gc_count_before,
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55 size_t word_size,
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56 bool should_initiate_conc_mark,
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57 double target_pause_time_ms,
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58 GCCause::Cause gc_cause)
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59 : VM_G1OperationWithAllocRequest(gc_count_before, word_size),
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60 _should_initiate_conc_mark(should_initiate_conc_mark),
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61 _target_pause_time_ms(target_pause_time_ms),
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62 _full_collections_completed_before(0) {
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63 guarantee(target_pause_time_ms > 0.0,
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64 err_msg("target_pause_time_ms = %1.6lf should be positive",
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65 target_pause_time_ms));
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66 guarantee(word_size == 0 || gc_cause == GCCause::_g1_inc_collection_pause,
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67 "we can only request an allocation if the GC cause is for "
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68 "an incremental GC pause");
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69 _gc_cause = gc_cause;
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70 }
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71
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72 void VM_G1IncCollectionPause::doit() {
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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
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79 if (_word_size > 0) {
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80 // An allocation has been requested. So, try to do that first.
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81 _result = g1h->attempt_allocation_at_safepoint(_word_size,
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82 false /* expect_null_cur_alloc_region */);
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83 if (_result != NULL) {
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84 // If we can successfully allocate before we actually do the
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85 // pause then we will consider this pause successful.
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86 _pause_succeeded = true;
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87 return;
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88 }
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89 }
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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
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103 // The above routine returns true if we were able to force the
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104 // next GC pause to be an initial mark; it returns false if a
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105 // marking cycle is already in progress.
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106 //
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107 // If a marking cycle is already in progress just return and skip
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108 // the pause - the requesting thread should block in doit_epilogue
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109 // until the marking cycle is complete.
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110 if (!res) {
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111 assert(_word_size == 0, "ExplicitGCInvokesConcurrent shouldn't be allocating");
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112 return;
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113 }
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114 }
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115
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116 _pause_succeeded =
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117 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
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118 if (_pause_succeeded && _word_size > 0) {
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119 // An allocation had been requested.
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120 _result = g1h->attempt_allocation_at_safepoint(_word_size,
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121 true /* expect_null_cur_alloc_region */);
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122 } else {
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123 assert(_result == NULL, "invariant");
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124 }
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125 }
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126
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127 void VM_G1IncCollectionPause::doit_epilogue() {
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128 VM_GC_Operation::doit_epilogue();
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129
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130 // If the pause was initiated by a System.gc() and
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131 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
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132 // that just started (or maybe one that was already in progress) to
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133 // finish.
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134 if (_gc_cause == GCCause::_java_lang_system_gc &&
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135 _should_initiate_conc_mark) {
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136 assert(ExplicitGCInvokesConcurrent,
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137 "the only way to be here is if ExplicitGCInvokesConcurrent is set");
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138
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139 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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140
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141 // In the doit() method we saved g1h->full_collections_completed()
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142 // in the _full_collections_completed_before field. We have to
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143 // wait until we observe that g1h->full_collections_completed()
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144 // has increased by at least one. This can happen if a) we started
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145 // a cycle and it completes, b) a cycle already in progress
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146 // completes, or c) a Full GC happens.
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147
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148 // If the condition has already been reached, there's no point in
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149 // actually taking the lock and doing the wait.
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150 if (g1h->full_collections_completed() <=
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151 _full_collections_completed_before) {
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152 // The following is largely copied from CMS
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153
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154 Thread* thr = Thread::current();
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155 assert(thr->is_Java_thread(), "invariant");
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156 JavaThread* jt = (JavaThread*)thr;
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157 ThreadToNativeFromVM native(jt);
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158
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159 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
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160 while (g1h->full_collections_completed() <=
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161 _full_collections_completed_before) {
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162 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
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163 }
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164 }
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165 }
342
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166 }
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167
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168 void VM_CGC_Operation::doit() {
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169 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
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170 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
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171 TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty);
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172 SharedHeap* sh = SharedHeap::heap();
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173 // This could go away if CollectedHeap gave access to _gc_is_active...
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174 if (sh != NULL) {
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175 IsGCActiveMark x;
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176 _cl->do_void();
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177 } else {
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178 _cl->do_void();
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179 }
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180 }
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181
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182 bool VM_CGC_Operation::doit_prologue() {
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183 Heap_lock->lock();
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184 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
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185 return true;
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186 }
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187
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188 void VM_CGC_Operation::doit_epilogue() {
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189 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
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190 Heap_lock->unlock();
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191 }