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annotate src/share/vm/gc_implementation/g1/g1RootProcessor.cpp @ 22910:3ca53859c3c7

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8027962: Per-phase timing measurements for strong roots processing Reviewed-by: tschatzl, ecaspole
author brutisso
date Thu, 19 Mar 2015 15:25:54 +0100
parents 38d6febe66af
children 9b582718fbea
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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 uint new_value = (uint)Atomic::add(1, &_n_workers_discovered_strong_classes);
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97 if (new_value == n_workers) {
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98 // This thread is last. Notify the others.
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99 MonitorLockerEx ml(&_lock, Mutex::_no_safepoint_check_flag);
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100 _lock.notify_all();
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101 }
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102 }
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103
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104 void G1RootProcessor::wait_until_all_strong_classes_discovered() {
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105 uint n_workers = _g1h->n_par_threads();
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106 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading");
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107
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108 if ((uint)_n_workers_discovered_strong_classes != n_workers) {
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109 MonitorLockerEx ml(&_lock, Mutex::_no_safepoint_check_flag);
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110 while ((uint)_n_workers_discovered_strong_classes != n_workers) {
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111 _lock.wait(Mutex::_no_safepoint_check_flag, 0, false);
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112 }
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113 }
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114 }
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115
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116 G1RootProcessor::G1RootProcessor(G1CollectedHeap* g1h) :
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117 _g1h(g1h),
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118 _process_strong_tasks(new SubTasksDone(G1RP_PS_NumElements)),
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119 _srs(g1h),
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120 _lock(Mutex::leaf, "G1 Root Scanning barrier lock", false),
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121 _n_workers_discovered_strong_classes(0) {}
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122
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123 void G1RootProcessor::evacuate_roots(OopClosure* scan_non_heap_roots,
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124 OopClosure* scan_non_heap_weak_roots,
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125 CLDClosure* scan_strong_clds,
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126 CLDClosure* scan_weak_clds,
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127 bool trace_metadata,
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128 uint worker_i) {
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129 // First scan the shared roots.
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130 double ext_roots_start = os::elapsedTime();
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131 G1GCPhaseTimes* phase_times = _g1h->g1_policy()->phase_times();
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132
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133 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots);
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134 BufferingOopClosure buf_scan_non_heap_weak_roots(scan_non_heap_weak_roots);
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135
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136 OopClosure* const weak_roots = &buf_scan_non_heap_weak_roots;
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137 OopClosure* const strong_roots = &buf_scan_non_heap_roots;
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138
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139 // CodeBlobClosures are not interoperable with BufferingOopClosures
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140 G1CodeBlobClosure root_code_blobs(scan_non_heap_roots);
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141
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142 process_java_roots(strong_roots,
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143 trace_metadata ? scan_strong_clds : NULL,
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144 scan_strong_clds,
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145 trace_metadata ? NULL : scan_weak_clds,
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146 &root_code_blobs,
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147 phase_times,
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148 worker_i);
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149
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150 // This is the point where this worker thread will not find more strong CLDs/nmethods.
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151 // Report this so G1 can synchronize the strong and weak CLDs/nmethods processing.
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152 if (trace_metadata) {
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153 worker_has_discovered_all_strong_classes();
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154 }
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155
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156 process_vm_roots(strong_roots, weak_roots, phase_times, worker_i);
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157
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158 {
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159 // Now the CM ref_processor roots.
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160 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CMRefRoots, worker_i);
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161 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_refProcessor_oops_do)) {
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162 // We need to treat the discovered reference lists of the
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163 // concurrent mark ref processor as roots and keep entries
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164 // (which are added by the marking threads) on them live
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165 // until they can be processed at the end of marking.
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166 _g1h->ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots);
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167 }
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168 }
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169
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170 if (trace_metadata) {
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171 {
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172 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::WaitForStrongCLD, worker_i);
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173 // Barrier to make sure all workers passed
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174 // the strong CLD and strong nmethods phases.
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175 wait_until_all_strong_classes_discovered();
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176 }
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177
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178 // Now take the complement of the strong CLDs.
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179 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::WeakCLDRoots, worker_i);
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180 ClassLoaderDataGraph::roots_cld_do(NULL, scan_weak_clds);
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181 } else {
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182 phase_times->record_time_secs(G1GCPhaseTimes::WaitForStrongCLD, worker_i, 0.0);
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183 phase_times->record_time_secs(G1GCPhaseTimes::WeakCLDRoots, worker_i, 0.0);
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184 }
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185
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186 // Finish up any enqueued closure apps (attributed as object copy time).
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187 buf_scan_non_heap_roots.done();
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188 buf_scan_non_heap_weak_roots.done();
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189
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190 double obj_copy_time_sec = buf_scan_non_heap_roots.closure_app_seconds()
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191 + buf_scan_non_heap_weak_roots.closure_app_seconds();
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192
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193 phase_times->record_time_secs(G1GCPhaseTimes::ObjCopy, worker_i, obj_copy_time_sec);
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194
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195 double ext_root_time_sec = os::elapsedTime() - ext_roots_start - obj_copy_time_sec;
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196
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197 phase_times->record_time_secs(G1GCPhaseTimes::ExtRootScan, worker_i, ext_root_time_sec);
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198
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199 // During conc marking we have to filter the per-thread SATB buffers
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200 // to make sure we remove any oops into the CSet (which will show up
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201 // as implicitly live).
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202 {
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203 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::SATBFiltering, worker_i);
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204 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_filter_satb_buffers) && _g1h->mark_in_progress()) {
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205 JavaThread::satb_mark_queue_set().filter_thread_buffers();
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206 }
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207 }
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208
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209 _process_strong_tasks->all_tasks_completed();
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210 }
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211
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212 void G1RootProcessor::process_strong_roots(OopClosure* oops,
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213 CLDClosure* clds,
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214 CodeBlobClosure* blobs) {
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215
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216 process_java_roots(oops, clds, clds, NULL, blobs, NULL, 0);
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217 process_vm_roots(oops, NULL, NULL, 0);
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218
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219 _process_strong_tasks->all_tasks_completed();
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220 }
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221
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222 void G1RootProcessor::process_all_roots(OopClosure* oops,
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223 CLDClosure* clds,
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224 CodeBlobClosure* blobs) {
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225
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226 process_java_roots(oops, NULL, clds, clds, NULL, NULL, 0);
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227 process_vm_roots(oops, oops, NULL, 0);
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228
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229 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_CodeCache_oops_do)) {
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230 CodeCache::blobs_do(blobs);
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231 }
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232
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233 _process_strong_tasks->all_tasks_completed();
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234 }
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235
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236 void G1RootProcessor::process_java_roots(OopClosure* strong_roots,
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237 CLDClosure* thread_stack_clds,
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238 CLDClosure* strong_clds,
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239 CLDClosure* weak_clds,
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240 CodeBlobClosure* strong_code,
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241 G1GCPhaseTimes* phase_times,
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242 uint worker_i) {
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243 assert(thread_stack_clds == NULL || weak_clds == NULL, "There is overlap between those, only one may be set");
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244 // Iterating over the CLDG and the Threads are done early to allow us to
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245 // first process the strong CLDs and nmethods and then, after a barrier,
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246 // let the thread process the weak CLDs and nmethods.
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247 {
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248 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CLDGRoots, worker_i);
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249 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_ClassLoaderDataGraph_oops_do)) {
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250 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds);
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251 }
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252 }
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253
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254 {
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255 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ThreadRoots, worker_i);
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256 Threads::possibly_parallel_oops_do(strong_roots, thread_stack_clds, strong_code);
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257 }
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258 }
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259
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260 void G1RootProcessor::process_vm_roots(OopClosure* strong_roots,
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261 OopClosure* weak_roots,
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262 G1GCPhaseTimes* phase_times,
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263 uint worker_i) {
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264 {
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265 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::UniverseRoots, worker_i);
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266 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_Universe_oops_do)) {
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267 Universe::oops_do(strong_roots);
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268 }
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269 }
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270
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271 {
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272 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JNIRoots, worker_i);
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273 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_JNIHandles_oops_do)) {
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274 JNIHandles::oops_do(strong_roots);
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275 }
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276 }
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277
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278 {
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279 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ObjectSynchronizerRoots, worker_i);
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280 if (!_process_strong_tasks-> is_task_claimed(G1RP_PS_ObjectSynchronizer_oops_do)) {
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281 ObjectSynchronizer::oops_do(strong_roots);
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282 }
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283 }
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284
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285 {
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286 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::FlatProfilerRoots, worker_i);
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287 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_FlatProfiler_oops_do)) {
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288 FlatProfiler::oops_do(strong_roots);
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289 }
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290 }
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291
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292 {
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293 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ManagementRoots, worker_i);
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294 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_Management_oops_do)) {
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295 Management::oops_do(strong_roots);
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296 }
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297 }
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298
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299 {
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300 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JVMTIRoots, worker_i);
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301 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_jvmti_oops_do)) {
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302 JvmtiExport::oops_do(strong_roots);
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303 }
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304 }
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305
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306 {
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307 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::SystemDictionaryRoots, worker_i);
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308 if (!_process_strong_tasks->is_task_claimed(G1RP_PS_SystemDictionary_oops_do)) {
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309 SystemDictionary::roots_oops_do(strong_roots, weak_roots);
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310 }
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311 }
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312
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313 {
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314 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::StringTableRoots, worker_i);
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315 // All threads execute the following. A specific chunk of buckets
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316 // from the StringTable are the individual tasks.
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317 if (weak_roots != NULL) {
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318 StringTable::possibly_parallel_oops_do(weak_roots);
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319 }
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320 }
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321 }
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322
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323 void G1RootProcessor::scan_remembered_sets(G1ParPushHeapRSClosure* scan_rs,
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324 OopClosure* scan_non_heap_weak_roots,
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325 uint worker_i) {
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326 G1GCPhaseTimes* phase_times = _g1h->g1_policy()->phase_times();
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327 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CodeCacheRoots, worker_i);
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328
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329 // Now scan the complement of the collection set.
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330 G1CodeBlobClosure scavenge_cs_nmethods(scan_non_heap_weak_roots);
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331
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332 _g1h->g1_rem_set()->oops_into_collection_set_do(scan_rs, &scavenge_cs_nmethods, worker_i);
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333 }
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334
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335 void G1RootProcessor::set_num_workers(int active_workers) {
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336 _process_strong_tasks->set_n_threads(active_workers);
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337 }