Mercurial > hg > truffle
annotate src/share/vm/runtime/sweeper.cpp @ 17610:908afcc9d1cb
8029091: Bug in calculation of code cache sweeping interval
Summary: Use signed data type so that no underflow can happen
Reviewed-by: kvn, roland
author | anoll |
---|---|
date | Tue, 17 Dec 2013 08:31:06 +0100 |
parents | 86e6d691f2e1 |
children | 49a31fd8b93d |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/codeCache.hpp" | |
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27 #include "code/compiledIC.hpp" |
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28 #include "code/icBuffer.hpp" |
1972 | 29 #include "code/nmethod.hpp" |
30 #include "compiler/compileBroker.hpp" | |
31 #include "memory/resourceArea.hpp" | |
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32 #include "oops/method.hpp" |
1972 | 33 #include "runtime/atomic.hpp" |
34 #include "runtime/compilationPolicy.hpp" | |
35 #include "runtime/mutexLocker.hpp" | |
36 #include "runtime/os.hpp" | |
37 #include "runtime/sweeper.hpp" | |
38 #include "runtime/vm_operations.hpp" | |
10405 | 39 #include "trace/tracing.hpp" |
1972 | 40 #include "utilities/events.hpp" |
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41 #include "utilities/ticks.inline.hpp" |
1972 | 42 #include "utilities/xmlstream.hpp" |
0 | 43 |
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44 #ifdef ASSERT |
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45 |
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46 #define SWEEP(nm) record_sweep(nm, __LINE__) |
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47 // Sweeper logging code |
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48 class SweeperRecord { |
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49 public: |
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50 int traversal; |
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51 int invocation; |
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52 int compile_id; |
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53 long traversal_mark; |
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54 int state; |
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55 const char* kind; |
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56 address vep; |
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57 address uep; |
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58 int line; |
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59 |
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60 void print() { |
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61 tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = " |
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62 PTR_FORMAT " state = %d traversal_mark %d line = %d", |
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63 traversal, |
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64 invocation, |
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65 compile_id, |
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66 kind == NULL ? "" : kind, |
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67 uep, |
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68 vep, |
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69 state, |
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70 traversal_mark, |
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71 line); |
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72 } |
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73 }; |
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74 |
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75 static int _sweep_index = 0; |
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76 static SweeperRecord* _records = NULL; |
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77 |
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78 void NMethodSweeper::report_events(int id, address entry) { |
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79 if (_records != NULL) { |
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80 for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
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81 if (_records[i].uep == entry || |
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82 _records[i].vep == entry || |
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83 _records[i].compile_id == id) { |
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84 _records[i].print(); |
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85 } |
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86 } |
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87 for (int i = 0; i < _sweep_index; i++) { |
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88 if (_records[i].uep == entry || |
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89 _records[i].vep == entry || |
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90 _records[i].compile_id == id) { |
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91 _records[i].print(); |
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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 |
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97 void NMethodSweeper::report_events() { |
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98 if (_records != NULL) { |
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99 for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
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100 // skip empty records |
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101 if (_records[i].vep == NULL) continue; |
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102 _records[i].print(); |
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103 } |
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104 for (int i = 0; i < _sweep_index; i++) { |
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105 // skip empty records |
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106 if (_records[i].vep == NULL) continue; |
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107 _records[i].print(); |
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108 } |
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109 } |
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110 } |
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111 |
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112 void NMethodSweeper::record_sweep(nmethod* nm, int line) { |
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113 if (_records != NULL) { |
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114 _records[_sweep_index].traversal = _traversals; |
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115 _records[_sweep_index].traversal_mark = nm->_stack_traversal_mark; |
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116 _records[_sweep_index].invocation = _sweep_fractions_left; |
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117 _records[_sweep_index].compile_id = nm->compile_id(); |
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118 _records[_sweep_index].kind = nm->compile_kind(); |
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119 _records[_sweep_index].state = nm->_state; |
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120 _records[_sweep_index].vep = nm->verified_entry_point(); |
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121 _records[_sweep_index].uep = nm->entry_point(); |
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122 _records[_sweep_index].line = line; |
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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; // Stack scan count, also sweep ID. |
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132 long NMethodSweeper::_time_counter = 0; // Virtual time used to periodically invoke sweeper |
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133 long NMethodSweeper::_last_sweep = 0; // Value of _time_counter when the last sweep happened |
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134 int NMethodSweeper::_seen = 0; // Nof. nmethod we have currently processed in current pass of CodeCache |
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135 int NMethodSweeper::_flushed_count = 0; // Nof. nmethods flushed in current sweep |
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136 int NMethodSweeper::_zombified_count = 0; // Nof. nmethods made zombie in current sweep |
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137 int NMethodSweeper::_marked_for_reclamation_count = 0; // Nof. nmethods marked for reclaim in current sweep |
0 | 138 |
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139 volatile bool NMethodSweeper::_should_sweep = true; // Indicates if we should invoke the sweeper |
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140 volatile int NMethodSweeper::_sweep_fractions_left = 0; // Nof. invocations left until we are completed with this pass |
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141 volatile int NMethodSweeper::_sweep_started = 0; // Flag to control conc sweeper |
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142 volatile int NMethodSweeper::_bytes_changed = 0; // Counts the total nmethod size if the nmethod changed from: |
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143 // 1) alive -> not_entrant |
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144 // 2) not_entrant -> zombie |
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145 // 3) zombie -> marked_for_reclamation |
0 | 146 |
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147 int NMethodSweeper::_total_nof_methods_reclaimed = 0; // Accumulated nof methods flushed |
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148 Tickspan NMethodSweeper::_total_time_sweeping; // Accumulated time sweeping |
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149 Tickspan NMethodSweeper::_total_time_this_sweep; // Total time this sweep |
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150 Tickspan NMethodSweeper::_peak_sweep_time; // Peak time for a full sweep |
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151 Tickspan NMethodSweeper::_peak_sweep_fraction_time; // Peak time sweeping one fraction |
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152 int NMethodSweeper::_hotness_counter_reset_val = 0; |
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153 |
10405 | 154 |
989 | 155 class MarkActivationClosure: public CodeBlobClosure { |
156 public: | |
157 virtual void do_code_blob(CodeBlob* cb) { | |
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158 if (cb->is_nmethod()) { |
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159 nmethod* nm = (nmethod*)cb; |
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160 nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val()); |
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161 // If we see an activation belonging to a non_entrant nmethod, we mark it. |
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162 if (nm->is_not_entrant()) { |
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163 nm->mark_as_seen_on_stack(); |
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164 } |
989 | 165 } |
166 } | |
167 }; | |
168 static MarkActivationClosure mark_activation_closure; | |
169 | |
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170 class SetHotnessClosure: public CodeBlobClosure { |
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171 public: |
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172 virtual void do_code_blob(CodeBlob* cb) { |
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173 if (cb->is_nmethod()) { |
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174 nmethod* nm = (nmethod*)cb; |
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175 nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val()); |
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176 } |
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177 } |
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178 }; |
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179 static SetHotnessClosure set_hotness_closure; |
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180 |
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181 |
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182 int NMethodSweeper::hotness_counter_reset_val() { |
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183 if (_hotness_counter_reset_val == 0) { |
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184 _hotness_counter_reset_val = (ReservedCodeCacheSize < M) ? 1 : (ReservedCodeCacheSize / M) * 2; |
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185 } |
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186 return _hotness_counter_reset_val; |
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187 } |
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188 bool NMethodSweeper::sweep_in_progress() { |
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189 return (_current != NULL); |
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190 } |
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191 |
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192 // Scans the stacks of all Java threads and marks activations of not-entrant methods. |
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193 // No need to synchronize access, since 'mark_active_nmethods' is always executed at a |
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194 // safepoint. |
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195 void NMethodSweeper::mark_active_nmethods() { |
0 | 196 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); |
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197 // If we do not want to reclaim not-entrant or zombie methods there is no need |
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198 // to scan stacks |
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199 if (!MethodFlushing) { |
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200 return; |
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201 } |
0 | 202 |
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203 // Increase time so that we can estimate when to invoke the sweeper again. |
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204 _time_counter++; |
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205 |
0 | 206 // Check for restart |
207 assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid"); | |
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208 if (!sweep_in_progress()) { |
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209 _seen = 0; |
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210 _sweep_fractions_left = NmethodSweepFraction; |
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211 _current = CodeCache::first_nmethod(); |
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212 _traversals += 1; |
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213 _total_time_this_sweep = Tickspan(); |
10405 | 214 |
0 | 215 if (PrintMethodFlushing) { |
216 tty->print_cr("### Sweep: stack traversal %d", _traversals); | |
217 } | |
989 | 218 Threads::nmethods_do(&mark_activation_closure); |
0 | 219 |
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220 } else { |
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221 // Only set hotness counter |
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222 Threads::nmethods_do(&set_hotness_closure); |
0 | 223 } |
224 | |
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225 OrderAccess::storestore(); |
0 | 226 } |
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227 /** |
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228 * This function invokes the sweeper if at least one of the three conditions is met: |
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229 * (1) The code cache is getting full |
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230 * (2) There are sufficient state changes in/since the last sweep. |
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231 * (3) We have not been sweeping for 'some time' |
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232 */ |
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233 void NMethodSweeper::possibly_sweep() { |
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234 assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode"); |
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235 // Only compiler threads are allowed to sweep |
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236 if (!MethodFlushing || !sweep_in_progress() || !Thread::current()->is_Compiler_thread()) { |
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237 return; |
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238 } |
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239 |
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240 // If there was no state change while nmethod sweeping, 'should_sweep' will be false. |
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241 // This is one of the two places where should_sweep can be set to true. The general |
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242 // idea is as follows: If there is enough free space in the code cache, there is no |
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243 // need to invoke the sweeper. The following formula (which determines whether to invoke |
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244 // the sweeper or not) depends on the assumption that for larger ReservedCodeCacheSizes |
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245 // we need less frequent sweeps than for smaller ReservedCodecCacheSizes. Furthermore, |
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246 // the formula considers how much space in the code cache is currently used. Here are |
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247 // some examples that will (hopefully) help in understanding. |
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248 // |
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249 // Small ReservedCodeCacheSizes: (e.g., < 16M) We invoke the sweeper every time, since |
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250 // the result of the division is 0. This |
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251 // keeps the used code cache size small |
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252 // (important for embedded Java) |
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253 // Large ReservedCodeCacheSize : (e.g., 256M + code cache is 10% full). The formula |
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254 // computes: (256 / 16) - 1 = 15 |
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255 // As a result, we invoke the sweeper after |
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256 // 15 invocations of 'mark_active_nmethods. |
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257 // Large ReservedCodeCacheSize: (e.g., 256M + code Cache is 90% full). The formula |
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258 // computes: (256 / 16) - 10 = 6. |
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259 if (!_should_sweep) { |
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260 const int time_since_last_sweep = _time_counter - _last_sweep; |
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261 // ReservedCodeCacheSize has an 'unsigned' type. We need a 'signed' type for max_wait_time, |
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262 // since 'time_since_last_sweep' can be larger than 'max_wait_time'. If that happens using |
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263 // an unsigned type would cause an underflow (wait_until_next_sweep becomes a large positive |
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264 // value) that disables the intended periodic sweeps. |
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265 const int max_wait_time = ReservedCodeCacheSize / (16 * M); |
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266 double wait_until_next_sweep = max_wait_time - time_since_last_sweep - CodeCache::reverse_free_ratio(); |
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267 assert(wait_until_next_sweep <= (double)max_wait_time, "Calculation of code cache sweeper interval is incorrect"); |
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268 |
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269 if ((wait_until_next_sweep <= 0.0) || !CompileBroker::should_compile_new_jobs()) { |
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270 _should_sweep = true; |
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271 } |
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272 } |
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273 |
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274 if (_should_sweep && _sweep_fractions_left > 0) { |
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275 // Only one thread at a time will sweep |
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276 jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 ); |
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277 if (old != 0) { |
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278 return; |
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279 } |
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280 #ifdef ASSERT |
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281 if (LogSweeper && _records == NULL) { |
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282 // Create the ring buffer for the logging code |
6197 | 283 _records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC); |
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284 memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries); |
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285 } |
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286 #endif |
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287 |
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288 if (_sweep_fractions_left > 0) { |
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289 sweep_code_cache(); |
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290 _sweep_fractions_left--; |
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291 } |
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292 |
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293 // We are done with sweeping the code cache once. |
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294 if (_sweep_fractions_left == 0) { |
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295 _last_sweep = _time_counter; |
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296 // Reset flag; temporarily disables sweeper |
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297 _should_sweep = false; |
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298 // If there was enough state change, 'possibly_enable_sweeper()' |
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299 // sets '_should_sweep' to true |
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300 possibly_enable_sweeper(); |
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301 // Reset _bytes_changed only if there was enough state change. _bytes_changed |
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302 // can further increase by calls to 'report_state_change'. |
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303 if (_should_sweep) { |
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304 _bytes_changed = 0; |
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305 } |
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306 } |
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307 _sweep_started = 0; |
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308 } |
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309 } |
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310 |
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311 void NMethodSweeper::sweep_code_cache() { |
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312 Ticks sweep_start_counter = Ticks::now(); |
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314 _flushed_count = 0; |
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315 _zombified_count = 0; |
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316 _marked_for_reclamation_count = 0; |
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318 if (PrintMethodFlushing && Verbose) { |
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319 tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _sweep_fractions_left); |
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320 } |
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321 |
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322 if (!CompileBroker::should_compile_new_jobs()) { |
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323 // If we have turned off compilations we might as well do full sweeps |
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324 // in order to reach the clean state faster. Otherwise the sleeping compiler |
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325 // threads will slow down sweeping. |
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326 _sweep_fractions_left = 1; |
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327 } |
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328 |
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329 // We want to visit all nmethods after NmethodSweepFraction |
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330 // invocations so divide the remaining number of nmethods by the |
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331 // remaining number of invocations. This is only an estimate since |
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332 // the number of nmethods changes during the sweep so the final |
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333 // stage must iterate until it there are no more nmethods. |
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334 int todo = (CodeCache::nof_nmethods() - _seen) / _sweep_fractions_left; |
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335 int swept_count = 0; |
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336 |
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337 |
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338 assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here"); |
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339 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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340 |
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341 int freed_memory = 0; |
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342 { |
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343 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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344 |
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345 // The last invocation iterates until there are no more nmethods |
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346 for (int i = 0; (i < todo || _sweep_fractions_left == 1) && _current != NULL; i++) { |
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347 swept_count++; |
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348 if (SafepointSynchronize::is_synchronizing()) { // Safepoint request |
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349 if (PrintMethodFlushing && Verbose) { |
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350 tty->print_cr("### Sweep at %d out of %d, invocation: %d, yielding to safepoint", _seen, CodeCache::nof_nmethods(), _sweep_fractions_left); |
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351 } |
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352 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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353 |
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354 assert(Thread::current()->is_Java_thread(), "should be java thread"); |
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355 JavaThread* thread = (JavaThread*)Thread::current(); |
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356 ThreadBlockInVM tbivm(thread); |
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357 thread->java_suspend_self(); |
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358 } |
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359 // Since we will give up the CodeCache_lock, always skip ahead |
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360 // to the next nmethod. Other blobs can be deleted by other |
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361 // threads but nmethods are only reclaimed by the sweeper. |
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362 nmethod* next = CodeCache::next_nmethod(_current); |
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363 |
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364 // Now ready to process nmethod and give up CodeCache_lock |
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365 { |
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366 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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367 freed_memory += process_nmethod(_current); |
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368 } |
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369 _seen++; |
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370 _current = next; |
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371 } |
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372 } |
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373 |
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374 assert(_sweep_fractions_left > 1 || _current == NULL, "must have scanned the whole cache"); |
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375 |
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376 const Ticks sweep_end_counter = Ticks::now(); |
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377 const Tickspan sweep_time = sweep_end_counter - sweep_start_counter; |
10405 | 378 _total_time_sweeping += sweep_time; |
379 _total_time_this_sweep += sweep_time; | |
380 _peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time); | |
381 _total_nof_methods_reclaimed += _flushed_count; | |
382 | |
383 EventSweepCodeCache event(UNTIMED); | |
384 if (event.should_commit()) { | |
385 event.set_starttime(sweep_start_counter); | |
386 event.set_endtime(sweep_end_counter); | |
387 event.set_sweepIndex(_traversals); | |
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388 event.set_sweepFractionIndex(NmethodSweepFraction - _sweep_fractions_left + 1); |
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389 event.set_sweptCount(swept_count); |
10405 | 390 event.set_flushedCount(_flushed_count); |
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391 event.set_markedCount(_marked_for_reclamation_count); |
10405 | 392 event.set_zombifiedCount(_zombified_count); |
393 event.commit(); | |
394 } | |
395 | |
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396 #ifdef ASSERT |
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397 if(PrintMethodFlushing) { |
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398 tty->print_cr("### sweeper: sweep time(%d): " |
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399 INT64_FORMAT, _sweep_fractions_left, (jlong)sweep_time.value()); |
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400 } |
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401 #endif |
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402 |
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403 if (_sweep_fractions_left == 1) { |
10405 | 404 _peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep); |
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405 log_sweep("finished"); |
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406 } |
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407 |
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408 // Sweeper is the only case where memory is released, check here if it |
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409 // is time to restart the compiler. Only checking if there is a certain |
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410 // amount of free memory in the code cache might lead to re-enabling |
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411 // compilation although no memory has been released. For example, there are |
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412 // cases when compilation was disabled although there is 4MB (or more) free |
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413 // memory in the code cache. The reason is code cache fragmentation. Therefore, |
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414 // it only makes sense to re-enable compilation if we have actually freed memory. |
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415 // Note that typically several kB are released for sweeping 16MB of the code |
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416 // cache. As a result, 'freed_memory' > 0 to restart the compiler. |
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417 if (!CompileBroker::should_compile_new_jobs() && (freed_memory > 0)) { |
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418 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); |
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419 log_sweep("restart_compiler"); |
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420 } |
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421 } |
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422 |
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423 /** |
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424 * This function updates the sweeper statistics that keep track of nmethods |
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425 * state changes. If there is 'enough' state change, the sweeper is invoked |
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426 * as soon as possible. There can be data races on _bytes_changed. The data |
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427 * races are benign, since it does not matter if we loose a couple of bytes. |
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428 * In the worst case we call the sweeper a little later. Also, we are guaranteed |
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429 * to invoke the sweeper if the code cache gets full. |
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430 */ |
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431 void NMethodSweeper::report_state_change(nmethod* nm) { |
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432 _bytes_changed += nm->total_size(); |
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433 possibly_enable_sweeper(); |
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434 } |
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435 |
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436 /** |
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437 * Function determines if there was 'enough' state change in the code cache to invoke |
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438 * the sweeper again. Currently, we determine 'enough' as more than 1% state change in |
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439 * the code cache since the last sweep. |
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440 */ |
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441 void NMethodSweeper::possibly_enable_sweeper() { |
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442 double percent_changed = ((double)_bytes_changed / (double)ReservedCodeCacheSize) * 100; |
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443 if (percent_changed > 1.0) { |
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444 _should_sweep = true; |
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445 } |
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446 } |
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447 |
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448 class NMethodMarker: public StackObj { |
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449 private: |
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450 CompilerThread* _thread; |
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451 public: |
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452 NMethodMarker(nmethod* nm) { |
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453 _thread = CompilerThread::current(); |
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454 if (!nm->is_zombie() && !nm->is_unloaded()) { |
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455 // Only expose live nmethods for scanning |
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456 _thread->set_scanned_nmethod(nm); |
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457 } |
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458 } |
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459 ~NMethodMarker() { |
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460 _thread->set_scanned_nmethod(NULL); |
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461 } |
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462 }; |
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463 |
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464 void NMethodSweeper::release_nmethod(nmethod *nm) { |
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465 // Clean up any CompiledICHolders |
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466 { |
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467 ResourceMark rm; |
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468 MutexLocker ml_patch(CompiledIC_lock); |
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469 RelocIterator iter(nm); |
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470 while (iter.next()) { |
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471 if (iter.type() == relocInfo::virtual_call_type) { |
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472 CompiledIC::cleanup_call_site(iter.virtual_call_reloc()); |
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473 } |
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474 } |
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475 } |
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476 |
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477 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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478 nm->flush(); |
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479 } |
0 | 480 |
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481 int NMethodSweeper::process_nmethod(nmethod *nm) { |
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482 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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483 |
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484 int freed_memory = 0; |
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485 // Make sure this nmethod doesn't get unloaded during the scan, |
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486 // since safepoints may happen during acquired below locks. |
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487 NMethodMarker nmm(nm); |
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488 SWEEP(nm); |
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489 |
0 | 490 // Skip methods that are currently referenced by the VM |
491 if (nm->is_locked_by_vm()) { | |
492 // But still remember to clean-up inline caches for alive nmethods | |
493 if (nm->is_alive()) { | |
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494 // Clean inline caches that point to zombie/non-entrant methods |
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495 MutexLocker cl(CompiledIC_lock); |
0 | 496 nm->cleanup_inline_caches(); |
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497 SWEEP(nm); |
0 | 498 } |
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499 return freed_memory; |
0 | 500 } |
501 | |
502 if (nm->is_zombie()) { | |
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503 // If it is the first time we see nmethod then we mark it. Otherwise, |
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504 // we reclaim it. When we have seen a zombie method twice, we know that |
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505 // there are no inline caches that refer to it. |
0 | 506 if (nm->is_marked_for_reclamation()) { |
507 assert(!nm->is_locked_by_vm(), "must not flush locked nmethods"); | |
941 | 508 if (PrintMethodFlushing && Verbose) { |
1202 | 509 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm); |
941 | 510 } |
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511 freed_memory = nm->total_size(); |
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512 release_nmethod(nm); |
10405 | 513 _flushed_count++; |
0 | 514 } else { |
941 | 515 if (PrintMethodFlushing && Verbose) { |
1202 | 516 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm); |
941 | 517 } |
0 | 518 nm->mark_for_reclamation(); |
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519 // Keep track of code cache state change |
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520 _bytes_changed += nm->total_size(); |
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521 _marked_for_reclamation_count++; |
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522 SWEEP(nm); |
0 | 523 } |
524 } else if (nm->is_not_entrant()) { | |
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525 // If there are no current activations of this method on the |
0 | 526 // stack we can safely convert it to a zombie method |
527 if (nm->can_not_entrant_be_converted()) { | |
941 | 528 if (PrintMethodFlushing && Verbose) { |
1202 | 529 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm); |
941 | 530 } |
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531 // Code cache state change is tracked in make_zombie() |
0 | 532 nm->make_zombie(); |
10405 | 533 _zombified_count++; |
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534 SWEEP(nm); |
0 | 535 } else { |
536 // Still alive, clean up its inline caches | |
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537 MutexLocker cl(CompiledIC_lock); |
0 | 538 nm->cleanup_inline_caches(); |
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539 SWEEP(nm); |
0 | 540 } |
541 } else if (nm->is_unloaded()) { | |
542 // Unloaded code, just make it a zombie | |
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543 if (PrintMethodFlushing && Verbose) { |
1202 | 544 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm); |
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545 } |
941 | 546 if (nm->is_osr_method()) { |
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547 SWEEP(nm); |
0 | 548 // No inline caches will ever point to osr methods, so we can just remove it |
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549 freed_memory = nm->total_size(); |
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550 release_nmethod(nm); |
10405 | 551 _flushed_count++; |
0 | 552 } else { |
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553 // Code cache state change is tracked in make_zombie() |
0 | 554 nm->make_zombie(); |
10405 | 555 _zombified_count++; |
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556 SWEEP(nm); |
0 | 557 } |
558 } else { | |
1202 | 559 if (UseCodeCacheFlushing) { |
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560 if (!nm->is_locked_by_vm() && !nm->is_osr_method() && !nm->is_native_method()) { |
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561 // Do not make native methods and OSR-methods not-entrant |
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562 nm->dec_hotness_counter(); |
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563 // Get the initial value of the hotness counter. This value depends on the |
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564 // ReservedCodeCacheSize |
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565 int reset_val = hotness_counter_reset_val(); |
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566 int time_since_reset = reset_val - nm->hotness_counter(); |
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567 double threshold = -reset_val + (CodeCache::reverse_free_ratio() * NmethodSweepActivity); |
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568 // The less free space in the code cache we have - the bigger reverse_free_ratio() is. |
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569 // I.e., 'threshold' increases with lower available space in the code cache and a higher |
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570 // NmethodSweepActivity. If the current hotness counter - which decreases from its initial |
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571 // value until it is reset by stack walking - is smaller than the computed threshold, the |
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572 // corresponding nmethod is considered for removal. |
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573 if ((NmethodSweepActivity > 0) && (nm->hotness_counter() < threshold) && (time_since_reset > 10)) { |
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574 // A method is marked as not-entrant if the method is |
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575 // 1) 'old enough': nm->hotness_counter() < threshold |
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576 // 2) The method was in_use for a minimum amount of time: (time_since_reset > 10) |
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577 // The second condition is necessary if we are dealing with very small code cache |
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578 // sizes (e.g., <10m) and the code cache size is too small to hold all hot methods. |
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579 // The second condition ensures that methods are not immediately made not-entrant |
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580 // after compilation. |
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581 nm->make_not_entrant(); |
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582 // Code cache state change is tracked in make_not_entrant() |
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583 if (PrintMethodFlushing && Verbose) { |
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584 tty->print_cr("### Nmethod %d/" PTR_FORMAT "made not-entrant: hotness counter %d/%d threshold %f", |
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585 nm->compile_id(), nm, nm->hotness_counter(), reset_val, threshold); |
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586 } |
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587 } |
1202 | 588 } |
589 } | |
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590 // Clean-up all inline caches that point to zombie/non-reentrant methods |
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591 MutexLocker cl(CompiledIC_lock); |
0 | 592 nm->cleanup_inline_caches(); |
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593 SWEEP(nm); |
0 | 594 } |
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595 return freed_memory; |
1202 | 596 } |
597 | |
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598 // Print out some state information about the current sweep and the |
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599 // state of the code cache if it's requested. |
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600 void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) { |
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601 if (PrintMethodFlushing) { |
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602 stringStream s; |
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603 // Dump code cache state into a buffer before locking the tty, |
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604 // because log_state() will use locks causing lock conflicts. |
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605 CodeCache::log_state(&s); |
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606 |
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607 ttyLocker ttyl; |
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608 tty->print("### sweeper: %s ", msg); |
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609 if (format != NULL) { |
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610 va_list ap; |
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611 va_start(ap, format); |
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612 tty->vprint(format, ap); |
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613 va_end(ap); |
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614 } |
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615 tty->print_cr(s.as_string()); |
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616 } |
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617 |
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618 if (LogCompilation && (xtty != NULL)) { |
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619 stringStream s; |
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620 // Dump code cache state into a buffer before locking the tty, |
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621 // because log_state() will use locks causing lock conflicts. |
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622 CodeCache::log_state(&s); |
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623 |
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624 ttyLocker ttyl; |
1646 | 625 xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count()); |
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626 if (format != NULL) { |
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627 va_list ap; |
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628 va_start(ap, format); |
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629 xtty->vprint(format, ap); |
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630 va_end(ap); |
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631 } |
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632 xtty->print(s.as_string()); |
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633 xtty->stamp(); |
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634 xtty->end_elem(); |
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635 } |
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636 } |