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annotate src/share/vm/runtime/sweeper.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents d2a62e0f25eb
children e522a00b91aa 0cfa93c2fcc4
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1 /*
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2 * Copyright (c) 1997, 2012, 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 "code/codeCache.hpp"
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27 #include "code/compiledIC.hpp"
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28 #include "code/icBuffer.hpp"
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29 #include "code/nmethod.hpp"
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30 #include "compiler/compileBroker.hpp"
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31 #include "memory/resourceArea.hpp"
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32 #include "oops/method.hpp"
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33 #include "runtime/atomic.hpp"
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34 #include "runtime/compilationPolicy.hpp"
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35 #include "runtime/mutexLocker.hpp"
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36 #include "runtime/os.hpp"
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37 #include "runtime/sweeper.hpp"
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38 #include "runtime/vm_operations.hpp"
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39 #include "utilities/events.hpp"
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40 #include "utilities/xmlstream.hpp"
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41
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42 #ifdef ASSERT
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43
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44 #define SWEEP(nm) record_sweep(nm, __LINE__)
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45 // Sweeper logging code
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46 class SweeperRecord {
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47 public:
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48 int traversal;
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49 int invocation;
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50 int compile_id;
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51 long traversal_mark;
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52 int state;
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53 const char* kind;
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54 address vep;
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55 address uep;
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56 int line;
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57
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58 void print() {
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59 tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = "
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60 PTR_FORMAT " state = %d traversal_mark %d line = %d",
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61 traversal,
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62 invocation,
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63 compile_id,
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64 kind == NULL ? "" : kind,
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65 uep,
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66 vep,
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67 state,
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68 traversal_mark,
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69 line);
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70 }
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71 };
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72
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73 static int _sweep_index = 0;
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74 static SweeperRecord* _records = NULL;
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75
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76 void NMethodSweeper::report_events(int id, address entry) {
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77 if (_records != NULL) {
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78 for (int i = _sweep_index; i < SweeperLogEntries; i++) {
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79 if (_records[i].uep == entry ||
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80 _records[i].vep == entry ||
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81 _records[i].compile_id == id) {
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82 _records[i].print();
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83 }
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84 }
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85 for (int i = 0; i < _sweep_index; i++) {
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86 if (_records[i].uep == entry ||
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87 _records[i].vep == entry ||
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88 _records[i].compile_id == id) {
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89 _records[i].print();
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90 }
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91 }
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92 }
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93 }
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94
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95 void NMethodSweeper::report_events() {
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96 if (_records != NULL) {
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97 for (int i = _sweep_index; i < SweeperLogEntries; i++) {
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98 // skip empty records
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99 if (_records[i].vep == NULL) continue;
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100 _records[i].print();
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101 }
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102 for (int i = 0; i < _sweep_index; i++) {
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103 // skip empty records
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104 if (_records[i].vep == NULL) continue;
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105 _records[i].print();
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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 NMethodSweeper::record_sweep(nmethod* nm, int line) {
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111 if (_records != NULL) {
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112 _records[_sweep_index].traversal = _traversals;
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113 _records[_sweep_index].traversal_mark = nm->_stack_traversal_mark;
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114 _records[_sweep_index].invocation = _invocations;
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115 _records[_sweep_index].compile_id = nm->compile_id();
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116 _records[_sweep_index].kind = nm->compile_kind();
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117 _records[_sweep_index].state = nm->_state;
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118 _records[_sweep_index].vep = nm->verified_entry_point();
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119 _records[_sweep_index].uep = nm->entry_point();
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120 _records[_sweep_index].line = line;
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121
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122 _sweep_index = (_sweep_index + 1) % SweeperLogEntries;
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123 }
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124 }
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125 #else
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126 #define SWEEP(nm)
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127 #endif
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128
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129
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130 long NMethodSweeper::_traversals = 0; // No. of stack traversals performed
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131 nmethod* NMethodSweeper::_current = NULL; // Current nmethod
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132 int NMethodSweeper::_seen = 0 ; // No. of nmethods we have currently processed in current pass of CodeCache
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133
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134 volatile int NMethodSweeper::_invocations = 0; // No. of invocations left until we are completed with this pass
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135 volatile int NMethodSweeper::_sweep_started = 0; // Whether a sweep is in progress.
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136
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137 jint NMethodSweeper::_locked_seen = 0;
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138 jint NMethodSweeper::_not_entrant_seen_on_stack = 0;
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139 bool NMethodSweeper::_rescan = false;
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140 bool NMethodSweeper::_do_sweep = false;
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141 bool NMethodSweeper::_was_full = false;
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142 jint NMethodSweeper::_advise_to_sweep = 0;
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143 jlong NMethodSweeper::_last_was_full = 0;
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144 uint NMethodSweeper::_highest_marked = 0;
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145 long NMethodSweeper::_was_full_traversal = 0;
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146
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jrose
parents: 0
diff changeset
147 class MarkActivationClosure: public CodeBlobClosure {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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parents: 0
diff changeset
148 public:
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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149 virtual void do_code_blob(CodeBlob* cb) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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150 // If we see an activation belonging to a non_entrant nmethod, we mark it.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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parents: 0
diff changeset
151 if (cb->is_nmethod() && ((nmethod*)cb)->is_not_entrant()) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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parents: 0
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152 ((nmethod*)cb)->mark_as_seen_on_stack();
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 0
diff changeset
153 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 0
diff changeset
154 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 0
diff changeset
155 };
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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parents: 0
diff changeset
156 static MarkActivationClosure mark_activation_closure;
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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parents: 0
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157
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
158 void NMethodSweeper::scan_stacks() {
0
a61af66fc99e Initial load
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parents:
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159 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint");
a61af66fc99e Initial load
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160 if (!MethodFlushing) return;
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
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161 _do_sweep = true;
0
a61af66fc99e Initial load
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162
a61af66fc99e Initial load
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163 // No need to synchronize access, since this is always executed at a
a61af66fc99e Initial load
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parents:
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164 // safepoint. If we aren't in the middle of scan and a rescan
1538
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165 // hasn't been requested then just return. If UseCodeCacheFlushing is on and
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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166 // code cache flushing is in progress, don't skip sweeping to help make progress
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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167 // clearing space in the code cache.
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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168 if ((_current == NULL && !_rescan) && !(UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs())) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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169 _do_sweep = false;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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170 return;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
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diff changeset
171 }
0
a61af66fc99e Initial load
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172
a61af66fc99e Initial load
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173 // Make sure CompiledIC_lock in unlocked, since we might update some
a61af66fc99e Initial load
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174 // inline caches. If it is, we just bail-out and try later.
a61af66fc99e Initial load
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175 if (CompiledIC_lock->is_locked() || Patching_lock->is_locked()) return;
a61af66fc99e Initial load
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176
a61af66fc99e Initial load
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177 // Check for restart
a61af66fc99e Initial load
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178 assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid");
a61af66fc99e Initial load
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179 if (_current == NULL) {
a61af66fc99e Initial load
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180 _seen = 0;
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181 _invocations = NmethodSweepFraction;
1538
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never
parents: 1202
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182 _current = CodeCache::first_nmethod();
0
a61af66fc99e Initial load
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183 _traversals += 1;
a61af66fc99e Initial load
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184 if (PrintMethodFlushing) {
a61af66fc99e Initial load
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185 tty->print_cr("### Sweep: stack traversal %d", _traversals);
a61af66fc99e Initial load
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186 }
989
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 0
diff changeset
187 Threads::nmethods_do(&mark_activation_closure);
0
a61af66fc99e Initial load
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parents:
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188
a61af66fc99e Initial load
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189 // reset the flags since we started a scan from the beginning.
a61af66fc99e Initial load
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190 _rescan = false;
a61af66fc99e Initial load
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191 _locked_seen = 0;
a61af66fc99e Initial load
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192 _not_entrant_seen_on_stack = 0;
a61af66fc99e Initial load
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parents:
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193 }
a61af66fc99e Initial load
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parents:
diff changeset
194
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
195 if (UseCodeCacheFlushing) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
196 if (!CodeCache::needs_flushing()) {
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
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197 // scan_stacks() runs during a safepoint, no race with setters
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
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diff changeset
198 _advise_to_sweep = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
199 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
200
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
201 if (was_full()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
202 // There was some progress so attempt to restart the compiler
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
203 jlong now = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
204 jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
205 jlong curr_interval = now - _last_was_full;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
206 if ((!CodeCache::needs_flushing()) && (curr_interval > max_interval)) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
207 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
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diff changeset
208 set_was_full(false);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
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parents: 1000
diff changeset
209
5f24d0319e54 4360113: Evict nmethods when code cache gets full
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parents: 1000
diff changeset
210 // Update the _last_was_full time so we can tell how fast the
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
211 // code cache is filling up
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
212 _last_was_full = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
213
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
214 log_sweep("restart_compiler");
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
215 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
216 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
217 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
218 }
a61af66fc99e Initial load
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parents:
diff changeset
219
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
220 void NMethodSweeper::possibly_sweep() {
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
221 assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
222 if ((!MethodFlushing) || (!_do_sweep)) return;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
223
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
224 if (_invocations > 0) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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diff changeset
225 // Only one thread at a time will sweep
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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diff changeset
226 jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 );
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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diff changeset
227 if (old != 0) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
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diff changeset
228 return;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
229 }
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
230 #ifdef ASSERT
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
231 if (LogSweeper && _records == NULL) {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
232 // Create the ring buffer for the logging code
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 4945
diff changeset
233 _records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC);
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
234 memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
235 }
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
236 #endif
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
237 if (_invocations > 0) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
238 sweep_code_cache();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
239 _invocations--;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
240 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
241 _sweep_started = 0;
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
242 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
243 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
244
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
245 void NMethodSweeper::sweep_code_cache() {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
246 #ifdef ASSERT
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
247 jlong sweep_start;
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
248 if (PrintMethodFlushing) {
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
249 sweep_start = os::javaTimeMillis();
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
250 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
251 #endif
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
252 if (PrintMethodFlushing && Verbose) {
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
253 tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _invocations);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
254 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
255
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
256 // We want to visit all nmethods after NmethodSweepFraction
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
257 // invocations so divide the remaining number of nmethods by the
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
258 // remaining number of invocations. This is only an estimate since
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
259 // the number of nmethods changes during the sweep so the final
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
260 // stage must iterate until it there are no more nmethods.
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
261 int todo = (CodeCache::nof_nmethods() - _seen) / _invocations;
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
262
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
263 assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
264 assert(!CodeCache_lock->owned_by_self(), "just checking");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
265
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
266 {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
267 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
268
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
269 // The last invocation iterates until there are no more nmethods
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
270 for (int i = 0; (i < todo || _invocations == 1) && _current != NULL; i++) {
4945
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
271 if (SafepointSynchronize::is_synchronizing()) { // Safepoint request
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
272 if (PrintMethodFlushing && Verbose) {
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
273 tty->print_cr("### Sweep at %d out of %d, invocation: %d, yielding to safepoint", _seen, CodeCache::nof_nmethods(), _invocations);
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
274 }
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
275 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
276
4945
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
277 assert(Thread::current()->is_Java_thread(), "should be java thread");
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
278 JavaThread* thread = (JavaThread*)Thread::current();
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
279 ThreadBlockInVM tbivm(thread);
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
280 thread->java_suspend_self();
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
281 }
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
282 // Since we will give up the CodeCache_lock, always skip ahead
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
283 // to the next nmethod. Other blobs can be deleted by other
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
284 // threads but nmethods are only reclaimed by the sweeper.
1615
ff38d05ea86f 6956958: assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() || is_optimized() || is_megam
never
parents: 1552
diff changeset
285 nmethod* next = CodeCache::next_nmethod(_current);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
286
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
287 // Now ready to process nmethod and give up CodeCache_lock
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
288 {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
289 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1615
ff38d05ea86f 6956958: assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() || is_optimized() || is_megam
never
parents: 1552
diff changeset
290 process_nmethod(_current);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
291 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
292 _seen++;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
293 _current = next;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
294 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
295 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
296
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
297 assert(_invocations > 1 || _current == NULL, "must have scanned the whole cache");
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
298
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
299 if (_current == NULL && !_rescan && (_locked_seen || _not_entrant_seen_on_stack)) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
300 // we've completed a scan without making progress but there were
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
301 // nmethods we were unable to process either because they were
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
302 // locked or were still on stack. We don't have to aggresively
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
303 // clean them up so just stop scanning. We could scan once more
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
304 // but that complicates the control logic and it's unlikely to
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
305 // matter much.
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
306 if (PrintMethodFlushing) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
307 tty->print_cr("### Couldn't make progress on some nmethods so stopping sweep");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
308 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
309 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
310
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
311 #ifdef ASSERT
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
312 if(PrintMethodFlushing) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
313 jlong sweep_end = os::javaTimeMillis();
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
314 tty->print_cr("### sweeper: sweep time(%d): " INT64_FORMAT, _invocations, sweep_end - sweep_start);
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
315 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
316 #endif
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
317
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
318 if (_invocations == 1) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
319 log_sweep("finished");
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
320 }
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
321 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
322
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
323 class NMethodMarker: public StackObj {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
324 private:
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
325 CompilerThread* _thread;
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
326 public:
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
327 NMethodMarker(nmethod* nm) {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
328 _thread = CompilerThread::current();
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
329 if (!nm->is_zombie() && !nm->is_unloaded()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
330 // Only expose live nmethods for scanning
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
331 _thread->set_scanned_nmethod(nm);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
332 }
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
333 }
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
334 ~NMethodMarker() {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
335 _thread->set_scanned_nmethod(NULL);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
336 }
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
337 };
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
338
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
339 void NMethodSweeper::release_nmethod(nmethod *nm) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
340 // Clean up any CompiledICHolders
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
341 {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
342 ResourceMark rm;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
343 MutexLocker ml_patch(CompiledIC_lock);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
344 RelocIterator iter(nm);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
345 while (iter.next()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
346 if (iter.type() == relocInfo::virtual_call_type) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
347 CompiledIC::cleanup_call_site(iter.virtual_call_reloc());
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
348 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
349 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
350 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
351
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
352 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
353 nm->flush();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
354 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
355
a61af66fc99e Initial load
duke
parents:
diff changeset
356 void NMethodSweeper::process_nmethod(nmethod *nm) {
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
357 assert(!CodeCache_lock->owned_by_self(), "just checking");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
358
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
359 // Make sure this nmethod doesn't get unloaded during the scan,
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
360 // since the locks acquired below might safepoint.
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
361 NMethodMarker nmm(nm);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
362
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
363 SWEEP(nm);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
364
0
a61af66fc99e Initial load
duke
parents:
diff changeset
365 // Skip methods that are currently referenced by the VM
a61af66fc99e Initial load
duke
parents:
diff changeset
366 if (nm->is_locked_by_vm()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
367 // But still remember to clean-up inline caches for alive nmethods
a61af66fc99e Initial load
duke
parents:
diff changeset
368 if (nm->is_alive()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
369 // Clean-up all inline caches that points to zombie/non-reentrant methods
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
370 MutexLocker cl(CompiledIC_lock);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
371 nm->cleanup_inline_caches();
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
372 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
373 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
374 _locked_seen++;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
375 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
376 }
a61af66fc99e Initial load
duke
parents:
diff changeset
377 return;
a61af66fc99e Initial load
duke
parents:
diff changeset
378 }
a61af66fc99e Initial load
duke
parents:
diff changeset
379
a61af66fc99e Initial load
duke
parents:
diff changeset
380 if (nm->is_zombie()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
381 // If it is first time, we see nmethod then we mark it. Otherwise,
a61af66fc99e Initial load
duke
parents:
diff changeset
382 // we reclame it. When we have seen a zombie method twice, we know that
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
383 // there are no inline caches that refer to it.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
384 if (nm->is_marked_for_reclamation()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
385 assert(!nm->is_locked_by_vm(), "must not flush locked nmethods");
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
386 if (PrintMethodFlushing && Verbose) {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
387 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm);
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
388 }
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
389 release_nmethod(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
390 } else {
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
391 if (PrintMethodFlushing && Verbose) {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
392 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm);
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
393 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
394 nm->mark_for_reclamation();
a61af66fc99e Initial load
duke
parents:
diff changeset
395 _rescan = true;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
396 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
397 }
a61af66fc99e Initial load
duke
parents:
diff changeset
398 } else if (nm->is_not_entrant()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
399 // If there is no current activations of this method on the
a61af66fc99e Initial load
duke
parents:
diff changeset
400 // stack we can safely convert it to a zombie method
a61af66fc99e Initial load
duke
parents:
diff changeset
401 if (nm->can_not_entrant_be_converted()) {
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
402 if (PrintMethodFlushing && Verbose) {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
403 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm);
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
404 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
405 nm->make_zombie();
a61af66fc99e Initial load
duke
parents:
diff changeset
406 _rescan = true;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
407 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
408 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
409 // Still alive, clean up its inline caches
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
410 MutexLocker cl(CompiledIC_lock);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
411 nm->cleanup_inline_caches();
a61af66fc99e Initial load
duke
parents:
diff changeset
412 // we coudn't transition this nmethod so don't immediately
a61af66fc99e Initial load
duke
parents:
diff changeset
413 // request a rescan. If this method stays on the stack for a
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
414 // long time we don't want to keep rescanning the code cache.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
415 _not_entrant_seen_on_stack++;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
416 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
417 }
a61af66fc99e Initial load
duke
parents:
diff changeset
418 } else if (nm->is_unloaded()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
419 // Unloaded code, just make it a zombie
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
420 if (PrintMethodFlushing && Verbose)
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
421 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm);
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
422 if (nm->is_osr_method()) {
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
423 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
424 // No inline caches will ever point to osr methods, so we can just remove it
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
425 release_nmethod(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
426 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
427 nm->make_zombie();
a61af66fc99e Initial load
duke
parents:
diff changeset
428 _rescan = true;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
429 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
430 }
a61af66fc99e Initial load
duke
parents:
diff changeset
431 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
432 assert(nm->is_alive(), "should be alive");
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
433
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
434 if (UseCodeCacheFlushing) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
435 if ((nm->method()->code() != nm) && !(nm->is_locked_by_vm()) && !(nm->is_osr_method()) &&
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
436 (_traversals > _was_full_traversal+2) && (((uint)nm->compile_id()) < _highest_marked) &&
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
437 CodeCache::needs_flushing()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
438 // This method has not been called since the forced cleanup happened
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
439 nm->make_not_entrant();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
440 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
441 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
442
0
a61af66fc99e Initial load
duke
parents:
diff changeset
443 // Clean-up all inline caches that points to zombie/non-reentrant methods
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
444 MutexLocker cl(CompiledIC_lock);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
445 nm->cleanup_inline_caches();
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
446 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
447 }
a61af66fc99e Initial load
duke
parents:
diff changeset
448 }
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
449
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
450 // Code cache unloading: when compilers notice the code cache is getting full,
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
451 // they will call a vm op that comes here. This code attempts to speculatively
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
452 // unload the oldest half of the nmethods (based on the compile job id) by
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
453 // saving the old code in a list in the CodeCache. Then
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
454 // execution resumes. If a method so marked is not called by the second sweeper
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
455 // stack traversal after the current one, the nmethod will be marked non-entrant and
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
456 // got rid of by normal sweeping. If the method is called, the Method*'s
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
457 // _code field is restored and the Method*/nmethod
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
458 // go back to their normal state.
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
459 void NMethodSweeper::handle_full_code_cache(bool is_full) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
460 // Only the first one to notice can advise us to start early cleaning
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
461 if (!is_full){
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
462 jint old = Atomic::cmpxchg( 1, &_advise_to_sweep, 0 );
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
463 if (old != 0) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
464 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
465 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
466 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
467
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
468 if (is_full) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
469 // Since code cache is full, immediately stop new compiles
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
470 bool did_set = CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
471 if (!did_set) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
472 // only the first to notice can start the cleaning,
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
473 // others will go back and block
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
474 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
475 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
476 set_was_full(true);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
477
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
478 // If we run out within MinCodeCacheFlushingInterval of the last unload time, give up
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
479 jlong now = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
480 jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
481 jlong curr_interval = now - _last_was_full;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
482 if (curr_interval < max_interval) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
483 _rescan = true;
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
484 log_sweep("disable_compiler", "flushing_interval='" UINT64_FORMAT "'",
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
485 curr_interval/1000);
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
486 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
487 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
488 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
489
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
490 VM_HandleFullCodeCache op(is_full);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
491 VMThread::execute(&op);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
492
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
493 // rescan again as soon as possible
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
494 _rescan = true;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
495 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
496
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
497 void NMethodSweeper::speculative_disconnect_nmethods(bool is_full) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
498 // If there was a race in detecting full code cache, only run
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
499 // one vm op for it or keep the compiler shut off
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
500
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
501 debug_only(jlong start = os::javaTimeMillis();)
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
502
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
503 if ((!was_full()) && (is_full)) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
504 if (!CodeCache::needs_flushing()) {
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
505 log_sweep("restart_compiler");
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
506 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
507 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
508 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
509 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
510
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
511 // Traverse the code cache trying to dump the oldest nmethods
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
512 uint curr_max_comp_id = CompileBroker::get_compilation_id();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
513 uint flush_target = ((curr_max_comp_id - _highest_marked) >> 1) + _highest_marked;
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
514 log_sweep("start_cleaning");
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
515
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
516 nmethod* nm = CodeCache::alive_nmethod(CodeCache::first());
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
517 jint disconnected = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
518 jint made_not_entrant = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
519 while ((nm != NULL)){
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
520 uint curr_comp_id = nm->compile_id();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
521
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
522 // OSR methods cannot be flushed like this. Also, don't flush native methods
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
523 // since they are part of the JDK in most cases
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
524 if (nm->is_in_use() && (!nm->is_osr_method()) && (!nm->is_locked_by_vm()) &&
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
525 (!nm->is_native_method()) && ((curr_comp_id < flush_target))) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
526
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
527 if ((nm->method()->code() == nm)) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
528 // This method has not been previously considered for
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
529 // unloading or it was restored already
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
530 CodeCache::speculatively_disconnect(nm);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
531 disconnected++;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
532 } else if (nm->is_speculatively_disconnected()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
533 // This method was previously considered for preemptive unloading and was not called since then
1783
d5d065957597 6953144: Tiered compilation
iveresov
parents: 1646
diff changeset
534 CompilationPolicy::policy()->delay_compilation(nm->method());
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
535 nm->make_not_entrant();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
536 made_not_entrant++;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
537 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
538
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
539 if (curr_comp_id > _highest_marked) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
540 _highest_marked = curr_comp_id;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
541 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
542 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
543 nm = CodeCache::alive_nmethod(CodeCache::next(nm));
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
544 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
545
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
546 log_sweep("stop_cleaning",
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
547 "disconnected='" UINT32_FORMAT "' made_not_entrant='" UINT32_FORMAT "'",
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
548 disconnected, made_not_entrant);
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
549
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
550 // Shut off compiler. Sweeper will start over with a new stack scan and
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
551 // traversal cycle and turn it back on if it clears enough space.
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
552 if (was_full()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
553 _last_was_full = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
554 CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
555 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
556
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
557 // After two more traversals the sweeper will get rid of unrestored nmethods
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
558 _was_full_traversal = _traversals;
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
559 #ifdef ASSERT
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
560 jlong end = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
561 if(PrintMethodFlushing && Verbose) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
562 tty->print_cr("### sweeper: unload time: " INT64_FORMAT, end-start);
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
563 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
564 #endif
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
565 }
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
566
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
567
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
568 // Print out some state information about the current sweep and the
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
569 // state of the code cache if it's requested.
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
570 void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
571 if (PrintMethodFlushing) {
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
572 stringStream s;
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
573 // Dump code cache state into a buffer before locking the tty,
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
574 // because log_state() will use locks causing lock conflicts.
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
575 CodeCache::log_state(&s);
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
576
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
577 ttyLocker ttyl;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
578 tty->print("### sweeper: %s ", msg);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
579 if (format != NULL) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
580 va_list ap;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
581 va_start(ap, format);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
582 tty->vprint(format, ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
583 va_end(ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
584 }
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
585 tty->print_cr(s.as_string());
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
586 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
587
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
588 if (LogCompilation && (xtty != NULL)) {
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
589 stringStream s;
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
590 // Dump code cache state into a buffer before locking the tty,
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
591 // because log_state() will use locks causing lock conflicts.
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
592 CodeCache::log_state(&s);
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
593
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
594 ttyLocker ttyl;
1646
8d5934a77f10 6968385: malformed xml in sweeper logging
never
parents: 1644
diff changeset
595 xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count());
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
596 if (format != NULL) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
597 va_list ap;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
598 va_start(ap, format);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
599 xtty->vprint(format, ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
600 va_end(ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
601 }
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
602 xtty->print(s.as_string());
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
603 xtty->stamp();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
604 xtty->end_elem();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
605 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
606 }