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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 1972:f95d63e2154a

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6989984: Use standard include model for Hospot Summary: Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
author stefank
date Tue, 23 Nov 2010 13:22:55 -0800
parents 4e5661ba9d98
children 631f79e71e90
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1 /*
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2 * Copyright (c) 2001, 2010, 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 "runtime/interfaceSupport.hpp"
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31
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32 void VM_G1CollectForAllocation::doit() {
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33 JvmtiGCForAllocationMarker jgcm;
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34 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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35 _res = g1h->satisfy_failed_allocation(_size);
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36 assert(g1h->is_in_or_null(_res), "result not in heap");
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37 }
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38
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39 void VM_G1CollectFull::doit() {
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40 JvmtiGCFullMarker jgcm;
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41 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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42 GCCauseSetter x(g1h, _gc_cause);
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43 g1h->do_full_collection(false /* clear_all_soft_refs */);
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44 }
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45
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46 void VM_G1IncCollectionPause::doit() {
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47 JvmtiGCForAllocationMarker jgcm;
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48 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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49 assert(!_should_initiate_conc_mark ||
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50 ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) ||
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51 (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)),
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52 "only a GC locker or a System.gc() induced GC should start a cycle");
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53
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54 GCCauseSetter x(g1h, _gc_cause);
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55 if (_should_initiate_conc_mark) {
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56 // It's safer to read full_collections_completed() here, given
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57 // that noone else will be updating it concurrently. Since we'll
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58 // only need it if we're initiating a marking cycle, no point in
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59 // setting it earlier.
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60 _full_collections_completed_before = g1h->full_collections_completed();
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61
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62 // At this point we are supposed to start a concurrent cycle. We
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63 // will do so if one is not already in progress.
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64 bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle();
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65 }
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66 g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
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67 }
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68
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69 void VM_G1IncCollectionPause::doit_epilogue() {
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70 VM_GC_Operation::doit_epilogue();
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71
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72 // If the pause was initiated by a System.gc() and
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73 // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
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74 // that just started (or maybe one that was already in progress) to
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75 // finish.
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76 if (_gc_cause == GCCause::_java_lang_system_gc &&
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77 _should_initiate_conc_mark) {
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78 assert(ExplicitGCInvokesConcurrent,
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79 "the only way to be here is if ExplicitGCInvokesConcurrent is set");
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80
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81 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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82
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83 // In the doit() method we saved g1h->full_collections_completed()
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84 // in the _full_collections_completed_before field. We have to
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85 // wait until we observe that g1h->full_collections_completed()
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86 // has increased by at least one. This can happen if a) we started
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87 // a cycle and it completes, b) a cycle already in progress
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88 // completes, or c) a Full GC happens.
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89
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90 // If the condition has already been reached, there's no point in
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91 // actually taking the lock and doing the wait.
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92 if (g1h->full_collections_completed() <=
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93 _full_collections_completed_before) {
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94 // The following is largely copied from CMS
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95
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96 Thread* thr = Thread::current();
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97 assert(thr->is_Java_thread(), "invariant");
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98 JavaThread* jt = (JavaThread*)thr;
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99 ThreadToNativeFromVM native(jt);
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100
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101 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
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102 while (g1h->full_collections_completed() <=
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103 _full_collections_completed_before) {
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104 FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
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105 }
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106 }
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107 }
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108 }
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109
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110 void VM_CGC_Operation::doit() {
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111 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
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112 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
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113 TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty);
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114 SharedHeap* sh = SharedHeap::heap();
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115 // This could go away if CollectedHeap gave access to _gc_is_active...
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116 if (sh != NULL) {
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117 IsGCActiveMark x;
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118 _cl->do_void();
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119 } else {
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120 _cl->do_void();
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121 }
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122 }
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123
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124 bool VM_CGC_Operation::doit_prologue() {
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125 Heap_lock->lock();
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126 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
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127 return true;
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128 }
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129
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130 void VM_CGC_Operation::doit_epilogue() {
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131 SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
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132 Heap_lock->unlock();
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133 }