Mercurial > hg > graal-compiler

annotate src/share/vm/runtime/sweeper.cpp @ 12324:510fbd28919c

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8020151: PSR:PERF Large performance regressions when code cache is filled Summary: Code cache sweeping based on method hotness; removed speculatively disconnect Reviewed-by: kvn, iveresov
author anoll
date Fri, 27 Sep 2013 10:50:55 +0200
parents ab274453d37f
children cefad50507d8 78da3894b86f
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1 /*
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2 * Copyright (c) 1997, 2013, 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 "trace/tracing.hpp"
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40 #include "utilities/events.hpp"
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41 #include "utilities/xmlstream.hpp"
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42
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43 #ifdef ASSERT
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44
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45 #define SWEEP(nm) record_sweep(nm, __LINE__)
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46 // Sweeper logging code
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47 class SweeperRecord {
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48 public:
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49 int traversal;
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50 int invocation;
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51 int compile_id;
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52 long traversal_mark;
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53 int state;
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54 const char* kind;
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55 address vep;
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56 address uep;
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57 int line;
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58
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59 void print() {
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60 tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = "
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61 PTR_FORMAT " state = %d traversal_mark %d line = %d",
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62 traversal,
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63 invocation,
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64 compile_id,
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65 kind == NULL ? "" : kind,
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66 uep,
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67 vep,
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68 state,
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69 traversal_mark,
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70 line);
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71 }
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72 };
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73
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74 static int _sweep_index = 0;
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75 static SweeperRecord* _records = NULL;
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76
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77 void NMethodSweeper::report_events(int id, address entry) {
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78 if (_records != NULL) {
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79 for (int i = _sweep_index; i < SweeperLogEntries; i++) {
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80 if (_records[i].uep == entry ||
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81 _records[i].vep == entry ||
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82 _records[i].compile_id == id) {
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83 _records[i].print();
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84 }
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85 }
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86 for (int i = 0; i < _sweep_index; i++) {
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87 if (_records[i].uep == entry ||
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88 _records[i].vep == entry ||
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89 _records[i].compile_id == id) {
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90 _records[i].print();
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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
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96 void NMethodSweeper::report_events() {
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97 if (_records != NULL) {
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98 for (int i = _sweep_index; i < SweeperLogEntries; i++) {
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99 // skip empty records
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100 if (_records[i].vep == NULL) continue;
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101 _records[i].print();
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102 }
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103 for (int i = 0; i < _sweep_index; i++) {
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104 // skip empty records
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105 if (_records[i].vep == NULL) continue;
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106 _records[i].print();
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107 }
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108 }
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109 }
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110
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111 void NMethodSweeper::record_sweep(nmethod* nm, int line) {
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112 if (_records != NULL) {
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113 _records[_sweep_index].traversal = _traversals;
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114 _records[_sweep_index].traversal_mark = nm->_stack_traversal_mark;
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115 _records[_sweep_index].invocation = _invocations;
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116 _records[_sweep_index].compile_id = nm->compile_id();
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117 _records[_sweep_index].kind = nm->compile_kind();
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118 _records[_sweep_index].state = nm->_state;
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119 _records[_sweep_index].vep = nm->verified_entry_point();
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120 _records[_sweep_index].uep = nm->entry_point();
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121 _records[_sweep_index].line = line;
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122
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123 _sweep_index = (_sweep_index + 1) % SweeperLogEntries;
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124 }
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125 }
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126 #else
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127 #define SWEEP(nm)
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128 #endif
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129
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130 nmethod* NMethodSweeper::_current = NULL; // Current nmethod
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131 long NMethodSweeper::_traversals = 0; // Nof. stack traversals performed
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132 int NMethodSweeper::_seen = 0; // Nof. nmethods we have currently processed in current pass of CodeCache
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133 int NMethodSweeper::_flushed_count = 0; // Nof. nmethods flushed in current sweep
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134 int NMethodSweeper::_zombified_count = 0; // Nof. nmethods made zombie in current sweep
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135 int NMethodSweeper::_marked_count = 0; // Nof. nmethods marked for reclaim in current sweep
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136
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137 volatile int NMethodSweeper::_invocations = 0; // Nof. invocations left until we are completed with this pass
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138 volatile int NMethodSweeper::_sweep_started = 0; // Whether a sweep is in progress.
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139
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140 jint NMethodSweeper::_locked_seen = 0;
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141 jint NMethodSweeper::_not_entrant_seen_on_stack = 0;
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142 bool NMethodSweeper::_request_mark_phase = false;
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143
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144 int NMethodSweeper::_total_nof_methods_reclaimed = 0;
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145 jlong NMethodSweeper::_total_time_sweeping = 0;
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146 jlong NMethodSweeper::_total_time_this_sweep = 0;
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147 jlong NMethodSweeper::_peak_sweep_time = 0;
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148 jlong NMethodSweeper::_peak_sweep_fraction_time = 0;
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149 int NMethodSweeper::_hotness_counter_reset_val = 0;
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150
10405
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151
989
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jrose
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diff changeset
152 class MarkActivationClosure: public CodeBlobClosure {
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153 public:
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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154 virtual void do_code_blob(CodeBlob* cb) {
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
155 if (cb->is_nmethod()) {
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
156 nmethod* nm = (nmethod*)cb;
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
157 nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
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158 // If we see an activation belonging to a non_entrant nmethod, we mark it.
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diff changeset
159 if (nm->is_not_entrant()) {
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
160 nm->mark_as_seen_on_stack();
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diff changeset
161 }
989
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 0
diff changeset
162 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 0
diff changeset
163 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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diff changeset
164 };
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165 static MarkActivationClosure mark_activation_closure;
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166
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167 class SetHotnessClosure: public CodeBlobClosure {
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168 public:
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169 virtual void do_code_blob(CodeBlob* cb) {
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170 if (cb->is_nmethod()) {
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171 nmethod* nm = (nmethod*)cb;
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172 nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
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173 }
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174 }
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175 };
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176 static SetHotnessClosure set_hotness_closure;
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177
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178
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179 int NMethodSweeper::hotness_counter_reset_val() {
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180 if (_hotness_counter_reset_val == 0) {
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181 _hotness_counter_reset_val = (ReservedCodeCacheSize < M) ? 1 : (ReservedCodeCacheSize / M) * 2;
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182 }
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183 return _hotness_counter_reset_val;
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184 }
10206
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
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185 bool NMethodSweeper::sweep_in_progress() {
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186 return (_current != NULL);
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
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187 }
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188
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189 // Scans the stacks of all Java threads and marks activations of not-entrant methods.
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190 // No need to synchronize access, since 'mark_active_nmethods' is always executed at a
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191 // safepoint.
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192 void NMethodSweeper::mark_active_nmethods() {
0
a61af66fc99e Initial load
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193 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint");
12324
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194 // If we do not want to reclaim not-entrant or zombie methods there is no need
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195 // to scan stacks
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196 if (!MethodFlushing) {
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197 return;
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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198 }
0
a61af66fc99e Initial load
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199
a61af66fc99e Initial load
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200 // Check for restart
a61af66fc99e Initial load
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201 assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid");
12324
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diff changeset
202 if (!sweep_in_progress() && need_marking_phase()) {
0
a61af66fc99e Initial load
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parents:
diff changeset
203 _seen = 0;
a61af66fc99e Initial load
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204 _invocations = NmethodSweepFraction;
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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diff changeset
205 _current = CodeCache::first_nmethod();
0
a61af66fc99e Initial load
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diff changeset
206 _traversals += 1;
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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207 _total_time_this_sweep = 0;
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208
0
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parents:
diff changeset
209 if (PrintMethodFlushing) {
a61af66fc99e Initial load
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parents:
diff changeset
210 tty->print_cr("### Sweep: stack traversal %d", _traversals);
a61af66fc99e Initial load
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parents:
diff changeset
211 }
989
148e5441d916 6863023: need non-perm oops in code cache for JSR 292
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parents: 0
diff changeset
212 Threads::nmethods_do(&mark_activation_closure);
0
a61af66fc99e Initial load
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parents:
diff changeset
213
a61af66fc99e Initial load
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214 // reset the flags since we started a scan from the beginning.
12324
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diff changeset
215 reset_nmethod_marking();
0
a61af66fc99e Initial load
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diff changeset
216 _locked_seen = 0;
a61af66fc99e Initial load
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217 _not_entrant_seen_on_stack = 0;
12324
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diff changeset
218 } else {
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
219 // Only set hotness counter
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
220 Threads::nmethods_do(&set_hotness_closure);
0
a61af66fc99e Initial load
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parents:
diff changeset
221 }
a61af66fc99e Initial load
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parents:
diff changeset
222
12324
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diff changeset
223 OrderAccess::storestore();
0
a61af66fc99e Initial load
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parents:
diff changeset
224 }
a61af66fc99e Initial load
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diff changeset
225
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
226 void NMethodSweeper::possibly_sweep() {
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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diff changeset
227 assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
12324
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diff changeset
228 if (!MethodFlushing || !sweep_in_progress()) {
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
229 return;
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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diff changeset
230 }
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
231
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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diff changeset
232 if (_invocations > 0) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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diff changeset
233 // Only one thread at a time will sweep
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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diff changeset
234 jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 );
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
235 if (old != 0) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
236 return;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
237 }
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
238 #ifdef ASSERT
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
239 if (LogSweeper && _records == NULL) {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
240 // Create the ring buffer for the logging code
6197
d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 4945
diff changeset
241 _records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC);
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
242 memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
243 }
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
244 #endif
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
245 if (_invocations > 0) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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diff changeset
246 sweep_code_cache();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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diff changeset
247 _invocations--;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
248 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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parents: 1615
diff changeset
249 _sweep_started = 0;
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
250 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
251 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
252
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
253 void NMethodSweeper::sweep_code_cache() {
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
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diff changeset
254
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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parents: 10206
diff changeset
255 jlong sweep_start_counter = os::elapsed_counter();
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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diff changeset
256
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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diff changeset
257 _flushed_count = 0;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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diff changeset
258 _zombified_count = 0;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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diff changeset
259 _marked_count = 0;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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diff changeset
260
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
261 if (PrintMethodFlushing && Verbose) {
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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parents: 1615
diff changeset
262 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
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parents: 1202
diff changeset
263 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
264
10206
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 6725
diff changeset
265 if (!CompileBroker::should_compile_new_jobs()) {
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
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diff changeset
266 // If we have turned off compilations we might as well do full sweeps
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
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diff changeset
267 // in order to reach the clean state faster. Otherwise the sleeping compiler
12324
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diff changeset
268 // threads will slow down sweeping.
10206
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
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diff changeset
269 _invocations = 1;
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
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diff changeset
270 }
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
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diff changeset
271
1644
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parents: 1615
diff changeset
272 // We want to visit all nmethods after NmethodSweepFraction
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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parents: 1615
diff changeset
273 // invocations so divide the remaining number of nmethods by the
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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parents: 1615
diff changeset
274 // remaining number of invocations. This is only an estimate since
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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parents: 1615
diff changeset
275 // 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
276 // stage must iterate until it there are no more nmethods.
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
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parents: 1615
diff changeset
277 int todo = (CodeCache::nof_nmethods() - _seen) / _invocations;
12266
ab274453d37f 8022883: Assertion failed: sweptCount >= flushedCount + markedCount + zombifiedCount
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parents: 10405
diff changeset
278 int swept_count = 0;
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
279
12324
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diff changeset
280
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
281 assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
282 assert(!CodeCache_lock->owned_by_self(), "just checking");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
283
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
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parents: 12266
diff changeset
284 int freed_memory = 0;
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
285 {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
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parents: 1202
diff changeset
286 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
287
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
288 // 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
289 for (int i = 0; (i < todo || _invocations == 1) && _current != NULL; i++) {
12266
ab274453d37f 8022883: Assertion failed: sweptCount >= flushedCount + markedCount + zombifiedCount
anoll
parents: 10405
diff changeset
290 swept_count++;
4945
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
291 if (SafepointSynchronize::is_synchronizing()) { // Safepoint request
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
292 if (PrintMethodFlushing && Verbose) {
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
293 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
294 }
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
295 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
296
4945
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
297 assert(Thread::current()->is_Java_thread(), "should be java thread");
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
298 JavaThread* thread = (JavaThread*)Thread::current();
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
299 ThreadBlockInVM tbivm(thread);
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
300 thread->java_suspend_self();
cfdfbeac0a5b 7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents: 3384
diff changeset
301 }
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
302 // 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
303 // 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
304 // 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
305 nmethod* next = CodeCache::next_nmethod(_current);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
306
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
307 // Now ready to process nmethod and give up CodeCache_lock
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 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
310 freed_memory += process_nmethod(_current);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
311 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
312 _seen++;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
313 _current = next;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
314 }
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
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
317 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
318
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
319 if (!sweep_in_progress() && !need_marking_phase() && (_locked_seen || _not_entrant_seen_on_stack)) {
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
320 // we've completed a scan without making progress but there were
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
321 // nmethods we were unable to process either because they were
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
322 // locked or were still on stack. We don't have to aggressively
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
323 // clean them up so just stop scanning. We could scan once more
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
324 // but that complicates the control logic and it's unlikely to
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
325 // matter much.
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
326 if (PrintMethodFlushing) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
327 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
328 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
329 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
330
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
331 jlong sweep_end_counter = os::elapsed_counter();
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
332 jlong sweep_time = sweep_end_counter - sweep_start_counter;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
333 _total_time_sweeping += sweep_time;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
334 _total_time_this_sweep += sweep_time;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
335 _peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
336 _total_nof_methods_reclaimed += _flushed_count;
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
337
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
338 EventSweepCodeCache event(UNTIMED);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
339 if (event.should_commit()) {
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
340 event.set_starttime(sweep_start_counter);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
341 event.set_endtime(sweep_end_counter);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
342 event.set_sweepIndex(_traversals);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
343 event.set_sweepFractionIndex(NmethodSweepFraction - _invocations + 1);
12266
ab274453d37f 8022883: Assertion failed: sweptCount >= flushedCount + markedCount + zombifiedCount
anoll
parents: 10405
diff changeset
344 event.set_sweptCount(swept_count);
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
345 event.set_flushedCount(_flushed_count);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
346 event.set_markedCount(_marked_count);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
347 event.set_zombifiedCount(_zombified_count);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
348 event.commit();
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
349 }
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
350
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
351 #ifdef ASSERT
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
352 if(PrintMethodFlushing) {
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
353 tty->print_cr("### sweeper: sweep time(%d): " INT64_FORMAT, _invocations, (jlong)sweep_time);
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
354 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
355 #endif
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
356
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
357 if (_invocations == 1) {
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
358 _peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep);
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
359 log_sweep("finished");
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
360 }
10206
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 6725
diff changeset
361
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
362 // Sweeper is the only case where memory is released, check here if it
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
363 // is time to restart the compiler. Only checking if there is a certain
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
364 // amount of free memory in the code cache might lead to re-enabling
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
365 // compilation although no memory has been released. For example, there are
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
366 // cases when compilation was disabled although there is 4MB (or more) free
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
367 // memory in the code cache. The reason is code cache fragmentation. Therefore,
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
368 // it only makes sense to re-enable compilation if we have actually freed memory.
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
369 // Note that typically several kB are released for sweeping 16MB of the code
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
370 // cache. As a result, 'freed_memory' > 0 to restart the compiler.
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
371 if (UseCodeCacheFlushing && (!CompileBroker::should_compile_new_jobs() && (freed_memory > 0))) {
10206
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 6725
diff changeset
372 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 6725
diff changeset
373 log_sweep("restart_compiler");
0cfa93c2fcc4 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 6725
diff changeset
374 }
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
375 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
376
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
377 class NMethodMarker: public StackObj {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
378 private:
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
379 CompilerThread* _thread;
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
380 public:
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
381 NMethodMarker(nmethod* nm) {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
382 _thread = CompilerThread::current();
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
383 if (!nm->is_zombie() && !nm->is_unloaded()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
384 // Only expose live nmethods for scanning
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
385 _thread->set_scanned_nmethod(nm);
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
386 }
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
387 }
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
388 ~NMethodMarker() {
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
389 _thread->set_scanned_nmethod(NULL);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
390 }
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
391 };
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
392
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
393 void NMethodSweeper::release_nmethod(nmethod *nm) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
394 // Clean up any CompiledICHolders
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
395 {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
396 ResourceMark rm;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
397 MutexLocker ml_patch(CompiledIC_lock);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
398 RelocIterator iter(nm);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
399 while (iter.next()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
400 if (iter.type() == relocInfo::virtual_call_type) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
401 CompiledIC::cleanup_call_site(iter.virtual_call_reloc());
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
402 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
403 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
404 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
405
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
406 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
407 nm->flush();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
408 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
409
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
410 int NMethodSweeper::process_nmethod(nmethod *nm) {
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
411 assert(!CodeCache_lock->owned_by_self(), "just checking");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
412
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
413 int freed_memory = 0;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
414 // Make sure this nmethod doesn't get unloaded during the scan,
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
415 // since safepoints may happen during acquired below locks.
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
416 NMethodMarker nmm(nm);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
417 SWEEP(nm);
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
418
0
a61af66fc99e Initial load
duke
parents:
diff changeset
419 // Skip methods that are currently referenced by the VM
a61af66fc99e Initial load
duke
parents:
diff changeset
420 if (nm->is_locked_by_vm()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
421 // But still remember to clean-up inline caches for alive nmethods
a61af66fc99e Initial load
duke
parents:
diff changeset
422 if (nm->is_alive()) {
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
423 // Clean inline caches that point to zombie/non-entrant methods
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
424 MutexLocker cl(CompiledIC_lock);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
425 nm->cleanup_inline_caches();
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
426 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
427 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
428 _locked_seen++;
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 }
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
431 return freed_memory;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
432 }
a61af66fc99e Initial load
duke
parents:
diff changeset
433
a61af66fc99e Initial load
duke
parents:
diff changeset
434 if (nm->is_zombie()) {
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
435 // If it is the first time we see nmethod then we mark it. Otherwise,
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
436 // we reclaim 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
437 // there are no inline caches that refer to it.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
438 if (nm->is_marked_for_reclamation()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
439 assert(!nm->is_locked_by_vm(), "must not flush locked nmethods");
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
440 if (PrintMethodFlushing && Verbose) {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
441 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
442 }
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
443 freed_memory = nm->total_size();
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
444 release_nmethod(nm);
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
445 _flushed_count++;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
446 } else {
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
447 if (PrintMethodFlushing && Verbose) {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
448 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
449 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
450 nm->mark_for_reclamation();
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
451 request_nmethod_marking();
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
452 _marked_count++;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
453 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
454 }
a61af66fc99e Initial load
duke
parents:
diff changeset
455 } else if (nm->is_not_entrant()) {
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
456 // If there are no current activations of this method on the
0
a61af66fc99e Initial load
duke
parents:
diff changeset
457 // stack we can safely convert it to a zombie method
a61af66fc99e Initial load
duke
parents:
diff changeset
458 if (nm->can_not_entrant_be_converted()) {
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
459 if (PrintMethodFlushing && Verbose) {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
460 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
461 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
462 nm->make_zombie();
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
463 request_nmethod_marking();
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
464 _zombified_count++;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
465 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
466 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
467 // Still alive, clean up its inline caches
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
468 MutexLocker cl(CompiledIC_lock);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
469 nm->cleanup_inline_caches();
a61af66fc99e Initial load
duke
parents:
diff changeset
470 // we coudn't transition this nmethod so don't immediately
a61af66fc99e Initial load
duke
parents:
diff changeset
471 // 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
472 // long time we don't want to keep rescanning the code cache.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
473 _not_entrant_seen_on_stack++;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
474 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
475 }
a61af66fc99e Initial load
duke
parents:
diff changeset
476 } else if (nm->is_unloaded()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
477 // Unloaded code, just make it a zombie
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
478 if (PrintMethodFlushing && Verbose) {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
479 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm);
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
480 }
941
8b46c4d82093 4957990: Perm heap bloat in JVM
ysr
parents: 0
diff changeset
481 if (nm->is_osr_method()) {
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
482 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
483 // No inline caches will ever point to osr methods, so we can just remove it
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
484 freed_memory = nm->total_size();
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6197
diff changeset
485 release_nmethod(nm);
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
486 _flushed_count++;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
487 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
488 nm->make_zombie();
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
489 request_nmethod_marking();
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 10206
diff changeset
490 _zombified_count++;
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
491 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
492 }
a61af66fc99e Initial load
duke
parents:
diff changeset
493 } else {
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
494 if (UseCodeCacheFlushing) {
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
495 if (!nm->is_locked_by_vm() && !nm->is_osr_method() && !nm->is_native_method()) {
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
496 // Do not make native methods and OSR-methods not-entrant
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
497 nm->dec_hotness_counter();
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
498 // Get the initial value of the hotness counter. This value depends on the
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
499 // ReservedCodeCacheSize
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
500 int reset_val = hotness_counter_reset_val();
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
501 int time_since_reset = reset_val - nm->hotness_counter();
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
502 double threshold = -reset_val + (CodeCache::reverse_free_ratio() * NmethodSweepActivity);
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
503 // The less free space in the code cache we have - the bigger reverse_free_ratio() is.
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
504 // I.e., 'threshold' increases with lower available space in the code cache and a higher
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
505 // NmethodSweepActivity. If the current hotness counter - which decreases from its initial
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
506 // value until it is reset by stack walking - is smaller than the computed threshold, the
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
507 // corresponding nmethod is considered for removal.
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
508 if ((NmethodSweepActivity > 0) && (nm->hotness_counter() < threshold) && (time_since_reset > 10)) {
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
509 // A method is marked as not-entrant if the method is
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
510 // 1) 'old enough': nm->hotness_counter() < threshold
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
511 // 2) The method was in_use for a minimum amount of time: (time_since_reset > 10)
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
512 // The second condition is necessary if we are dealing with very small code cache
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
513 // sizes (e.g., <10m) and the code cache size is too small to hold all hot methods.
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
514 // The second condition ensures that methods are not immediately made not-entrant
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
515 // after compilation.
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
516 nm->make_not_entrant();
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
517 request_nmethod_marking();
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
518 }
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
519 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
520 }
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
521 // Clean-up all inline caches that point to zombie/non-reentrant methods
1538
bfe29ec02863 6950075: nmethod sweeper should operate concurrently
never
parents: 1202
diff changeset
522 MutexLocker cl(CompiledIC_lock);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
523 nm->cleanup_inline_caches();
3384
f52ed367b66d 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 2482
diff changeset
524 SWEEP(nm);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
525 }
12324
510fbd28919c 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 12266
diff changeset
526 return freed_memory;
1202
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
527 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full
kvn
parents: 1000
diff changeset
528
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
529 // 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
530 // state of the code cache if it's requested.
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
531 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
532 if (PrintMethodFlushing) {
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
533 stringStream s;
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
534 // 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
535 // 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
536 CodeCache::log_state(&s);
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
537
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
538 ttyLocker ttyl;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
539 tty->print("### sweeper: %s ", msg);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
540 if (format != NULL) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
541 va_list ap;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
542 va_start(ap, format);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
543 tty->vprint(format, ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
544 va_end(ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
545 }
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
546 tty->print_cr(s.as_string());
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
547 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
548
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
549 if (LogCompilation && (xtty != NULL)) {
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
550 stringStream s;
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
551 // 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
552 // 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
553 CodeCache::log_state(&s);
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
554
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
555 ttyLocker ttyl;
1646
8d5934a77f10 6968385: malformed xml in sweeper logging
never
parents: 1644
diff changeset
556 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
557 if (format != NULL) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
558 va_list ap;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
559 va_start(ap, format);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
560 xtty->vprint(format, ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
561 va_end(ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
562 }
2482
dbccacb79c63 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 2426
diff changeset
563 xtty->print(s.as_string());
1644
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
564 xtty->stamp();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie
never
parents: 1615
diff changeset
565 xtty->end_elem();
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 }