Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1RootProcessor.cpp @ 23025:24c446b2460d
8076265: Simplify deal_with_reference
Summary: Eliminate _CHECK_BOTH_FINGERS_ and simplify.
Reviewed-by: brutisso, tschatzl
author | kbarrett |
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date | Wed, 08 Apr 2015 10:32:16 -0400 |
parents | 9b582718fbea |
children | bd88fd590f4e c0205eddb317 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2015, 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 |
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27 #include "classfile/symbolTable.hpp" |
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28 #include "classfile/systemDictionary.hpp" |
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29 #include "code/codeCache.hpp" |
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30 #include "gc_implementation/g1/bufferingOopClosure.hpp" |
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31 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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32 #include "gc_implementation/g1/g1CollectorPolicy.hpp" |
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33 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
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34 #include "gc_implementation/g1/g1RemSet.inline.hpp" |
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35 #include "gc_implementation/g1/g1RootProcessor.hpp" |
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36 #include "memory/allocation.inline.hpp" |
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37 #include "runtime/fprofiler.hpp" |
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38 #include "runtime/mutex.hpp" |
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39 #include "services/management.hpp" |
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40 |
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41 class G1CodeBlobClosure : public CodeBlobClosure { |
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42 class HeapRegionGatheringOopClosure : public OopClosure { |
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43 G1CollectedHeap* _g1h; |
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44 OopClosure* _work; |
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45 nmethod* _nm; |
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46 |
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47 template <typename T> |
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48 void do_oop_work(T* p) { |
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49 _work->do_oop(p); |
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50 T oop_or_narrowoop = oopDesc::load_heap_oop(p); |
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51 if (!oopDesc::is_null(oop_or_narrowoop)) { |
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52 oop o = oopDesc::decode_heap_oop_not_null(oop_or_narrowoop); |
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53 HeapRegion* hr = _g1h->heap_region_containing_raw(o); |
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54 assert(!_g1h->obj_in_cs(o) || hr->rem_set()->strong_code_roots_list_contains(_nm), "if o still in CS then evacuation failed and nm must already be in the remset"); |
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55 hr->add_strong_code_root(_nm); |
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56 } |
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57 } |
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58 |
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59 public: |
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60 HeapRegionGatheringOopClosure(OopClosure* oc) : _g1h(G1CollectedHeap::heap()), _work(oc), _nm(NULL) {} |
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61 |
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62 void do_oop(oop* o) { |
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63 do_oop_work(o); |
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64 } |
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65 |
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66 void do_oop(narrowOop* o) { |
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67 do_oop_work(o); |
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68 } |
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69 |
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70 void set_nm(nmethod* nm) { |
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71 _nm = nm; |
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72 } |
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73 }; |
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74 |
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75 HeapRegionGatheringOopClosure _oc; |
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76 public: |
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77 G1CodeBlobClosure(OopClosure* oc) : _oc(oc) {} |
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78 |
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79 void do_code_blob(CodeBlob* cb) { |
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80 nmethod* nm = cb->as_nmethod_or_null(); |
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81 if (nm != NULL) { |
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82 if (!nm->test_set_oops_do_mark()) { |
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83 _oc.set_nm(nm); |
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84 nm->oops_do(&_oc); |
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85 nm->fix_oop_relocations(); |
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86 } |
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87 } |
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88 } |
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89 }; |
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90 |
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91 |
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92 void G1RootProcessor::worker_has_discovered_all_strong_classes() { |
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93 uint n_workers = _g1h->n_par_threads(); |
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94 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); |
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95 |
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96 if (n_workers > 0) { |
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97 uint new_value = (uint)Atomic::add(1, &_n_workers_discovered_strong_classes); |
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98 if (new_value == n_workers) { |
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99 // This thread is last. Notify the others. |
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100 MonitorLockerEx ml(&_lock, Mutex::_no_safepoint_check_flag); |
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101 _lock.notify_all(); |
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102 } |
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103 } |
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104 } |
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105 |
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106 void G1RootProcessor::wait_until_all_strong_classes_discovered() { |
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107 uint n_workers = _g1h->n_par_threads(); |
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108 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); |
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109 |
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110 if (n_workers > 0 && (uint)_n_workers_discovered_strong_classes != n_workers) { |
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111 MonitorLockerEx ml(&_lock, Mutex::_no_safepoint_check_flag); |
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112 while ((uint)_n_workers_discovered_strong_classes != n_workers) { |
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113 _lock.wait(Mutex::_no_safepoint_check_flag, 0, false); |
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114 } |
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115 } |
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116 } |
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117 |
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118 G1RootProcessor::G1RootProcessor(G1CollectedHeap* g1h) : |
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119 _g1h(g1h), |
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120 _process_strong_tasks(new SubTasksDone(G1RP_PS_NumElements)), |
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121 _srs(g1h), |
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122 _lock(Mutex::leaf, "G1 Root Scanning barrier lock", false), |
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123 _n_workers_discovered_strong_classes(0) {} |
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124 |
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125 void G1RootProcessor::evacuate_roots(OopClosure* scan_non_heap_roots, |
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126 OopClosure* scan_non_heap_weak_roots, |
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127 CLDClosure* scan_strong_clds, |
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128 CLDClosure* scan_weak_clds, |
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129 bool trace_metadata, |
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130 uint worker_i) { |
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131 // First scan the shared roots. |
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132 double ext_roots_start = os::elapsedTime(); |
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133 G1GCPhaseTimes* phase_times = _g1h->g1_policy()->phase_times(); |
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134 |
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135 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); |
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136 BufferingOopClosure buf_scan_non_heap_weak_roots(scan_non_heap_weak_roots); |
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137 |
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138 OopClosure* const weak_roots = &buf_scan_non_heap_weak_roots; |
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139 OopClosure* const strong_roots = &buf_scan_non_heap_roots; |
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140 |
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141 // CodeBlobClosures are not interoperable with BufferingOopClosures |
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142 G1CodeBlobClosure root_code_blobs(scan_non_heap_roots); |
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143 |
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144 process_java_roots(strong_roots, |
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145 trace_metadata ? scan_strong_clds : NULL, |
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146 scan_strong_clds, |
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147 trace_metadata ? NULL : scan_weak_clds, |
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148 &root_code_blobs, |
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149 phase_times, |
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150 worker_i); |
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151 |
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152 // This is the point where this worker thread will not find more strong CLDs/nmethods. |
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153 // Report this so G1 can synchronize the strong and weak CLDs/nmethods processing. |
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154 if (trace_metadata) { |
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155 worker_has_discovered_all_strong_classes(); |
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156 } |
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157 |
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158 process_vm_roots(strong_roots, weak_roots, phase_times, worker_i); |
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159 |
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160 { |
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161 // Now the CM ref_processor roots. |
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162 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CMRefRoots, worker_i); |
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163 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_refProcessor_oops_do)) { |
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164 // We need to treat the discovered reference lists of the |
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165 // concurrent mark ref processor as roots and keep entries |
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166 // (which are added by the marking threads) on them live |
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167 // until they can be processed at the end of marking. |
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168 _g1h->ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
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169 } |
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170 } |
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171 |
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172 if (trace_metadata) { |
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173 { |
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174 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::WaitForStrongCLD, worker_i); |
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175 // Barrier to make sure all workers passed |
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176 // the strong CLD and strong nmethods phases. |
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177 wait_until_all_strong_classes_discovered(); |
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178 } |
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179 |
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180 // Now take the complement of the strong CLDs. |
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181 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::WeakCLDRoots, worker_i); |
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182 ClassLoaderDataGraph::roots_cld_do(NULL, scan_weak_clds); |
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183 } else { |
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184 phase_times->record_time_secs(G1GCPhaseTimes::WaitForStrongCLD, worker_i, 0.0); |
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185 phase_times->record_time_secs(G1GCPhaseTimes::WeakCLDRoots, worker_i, 0.0); |
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186 } |
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187 |
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188 // Finish up any enqueued closure apps (attributed as object copy time). |
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189 buf_scan_non_heap_roots.done(); |
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190 buf_scan_non_heap_weak_roots.done(); |
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191 |
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192 double obj_copy_time_sec = buf_scan_non_heap_roots.closure_app_seconds() |
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193 + buf_scan_non_heap_weak_roots.closure_app_seconds(); |
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194 |
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195 phase_times->record_time_secs(G1GCPhaseTimes::ObjCopy, worker_i, obj_copy_time_sec); |
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196 |
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197 double ext_root_time_sec = os::elapsedTime() - ext_roots_start - obj_copy_time_sec; |
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198 |
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199 phase_times->record_time_secs(G1GCPhaseTimes::ExtRootScan, worker_i, ext_root_time_sec); |
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200 |
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201 // During conc marking we have to filter the per-thread SATB buffers |
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202 // to make sure we remove any oops into the CSet (which will show up |
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203 // as implicitly live). |
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204 { |
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205 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::SATBFiltering, worker_i); |
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206 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_filter_satb_buffers) && _g1h->mark_in_progress()) { |
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207 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
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208 } |
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209 } |
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210 |
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211 _process_strong_tasks->all_tasks_completed(); |
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212 } |
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213 |
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214 void G1RootProcessor::process_strong_roots(OopClosure* oops, |
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215 CLDClosure* clds, |
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216 CodeBlobClosure* blobs) { |
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217 |
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218 process_java_roots(oops, clds, clds, NULL, blobs, NULL, 0); |
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219 process_vm_roots(oops, NULL, NULL, 0); |
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220 |
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221 _process_strong_tasks->all_tasks_completed(); |
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222 } |
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223 |
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224 void G1RootProcessor::process_all_roots(OopClosure* oops, |
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225 CLDClosure* clds, |
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226 CodeBlobClosure* blobs) { |
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227 |
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228 process_java_roots(oops, NULL, clds, clds, NULL, NULL, 0); |
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229 process_vm_roots(oops, oops, NULL, 0); |
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230 |
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231 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_CodeCache_oops_do)) { |
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232 CodeCache::blobs_do(blobs); |
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233 } |
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234 |
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235 _process_strong_tasks->all_tasks_completed(); |
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236 } |
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237 |
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238 void G1RootProcessor::process_java_roots(OopClosure* strong_roots, |
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239 CLDClosure* thread_stack_clds, |
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240 CLDClosure* strong_clds, |
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241 CLDClosure* weak_clds, |
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242 CodeBlobClosure* strong_code, |
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243 G1GCPhaseTimes* phase_times, |
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244 uint worker_i) { |
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245 assert(thread_stack_clds == NULL || weak_clds == NULL, "There is overlap between those, only one may be set"); |
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246 // Iterating over the CLDG and the Threads are done early to allow us to |
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247 // first process the strong CLDs and nmethods and then, after a barrier, |
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248 // let the thread process the weak CLDs and nmethods. |
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249 { |
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250 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CLDGRoots, worker_i); |
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251 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_ClassLoaderDataGraph_oops_do)) { |
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252 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds); |
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253 } |
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254 } |
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255 |
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256 { |
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257 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ThreadRoots, worker_i); |
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258 Threads::possibly_parallel_oops_do(strong_roots, thread_stack_clds, strong_code); |
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259 } |
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260 } |
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261 |
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262 void G1RootProcessor::process_vm_roots(OopClosure* strong_roots, |
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263 OopClosure* weak_roots, |
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264 G1GCPhaseTimes* phase_times, |
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265 uint worker_i) { |
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266 { |
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267 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::UniverseRoots, worker_i); |
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268 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_Universe_oops_do)) { |
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269 Universe::oops_do(strong_roots); |
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270 } |
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271 } |
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272 |
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273 { |
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274 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JNIRoots, worker_i); |
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275 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_JNIHandles_oops_do)) { |
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276 JNIHandles::oops_do(strong_roots); |
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277 } |
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278 } |
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279 |
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280 { |
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281 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ObjectSynchronizerRoots, worker_i); |
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282 if (!_process_strong_tasks-> is_task_claimed(G1RP_PS_ObjectSynchronizer_oops_do)) { |
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283 ObjectSynchronizer::oops_do(strong_roots); |
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284 } |
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285 } |
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286 |
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287 { |
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288 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::FlatProfilerRoots, worker_i); |
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289 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_FlatProfiler_oops_do)) { |
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290 FlatProfiler::oops_do(strong_roots); |
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291 } |
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292 } |
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293 |
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294 { |
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295 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ManagementRoots, worker_i); |
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296 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_Management_oops_do)) { |
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297 Management::oops_do(strong_roots); |
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298 } |
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299 } |
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300 |
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301 { |
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302 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JVMTIRoots, worker_i); |
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303 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_jvmti_oops_do)) { |
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304 JvmtiExport::oops_do(strong_roots); |
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305 } |
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306 } |
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307 |
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308 { |
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309 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::SystemDictionaryRoots, worker_i); |
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310 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_SystemDictionary_oops_do)) { |
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311 SystemDictionary::roots_oops_do(strong_roots, weak_roots); |
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312 } |
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313 } |
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314 |
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315 { |
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316 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::StringTableRoots, worker_i); |
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317 // All threads execute the following. A specific chunk of buckets |
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318 // from the StringTable are the individual tasks. |
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319 if (weak_roots != NULL) { |
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320 StringTable::possibly_parallel_oops_do(weak_roots); |
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321 } |
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322 } |
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323 } |
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324 |
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325 void G1RootProcessor::scan_remembered_sets(G1ParPushHeapRSClosure* scan_rs, |
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326 OopClosure* scan_non_heap_weak_roots, |
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327 uint worker_i) { |
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328 G1GCPhaseTimes* phase_times = _g1h->g1_policy()->phase_times(); |
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329 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CodeCacheRoots, worker_i); |
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330 |
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331 // Now scan the complement of the collection set. |
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332 G1CodeBlobClosure scavenge_cs_nmethods(scan_non_heap_weak_roots); |
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333 |
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334 _g1h->g1_rem_set()->oops_into_collection_set_do(scan_rs, &scavenge_cs_nmethods, worker_i); |
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335 } |
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336 |
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337 void G1RootProcessor::set_num_workers(int active_workers) { |
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338 _process_strong_tasks->set_n_threads(active_workers); |
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339 } |