Mercurial > hg > truffle
annotate src/share/vm/runtime/sweeper.cpp @ 20347:3374ec4c4448
Merge
author | amurillo |
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date | Tue, 26 Aug 2014 13:38:33 -0700 |
parents | ce8f6bb717c9 |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 * | |
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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" | |
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36 #include "runtime/orderAccess.inline.hpp" |
1972 | 37 #include "runtime/os.hpp" |
38 #include "runtime/sweeper.hpp" | |
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39 #include "runtime/thread.inline.hpp" |
1972 | 40 #include "runtime/vm_operations.hpp" |
10405 | 41 #include "trace/tracing.hpp" |
1972 | 42 #include "utilities/events.hpp" |
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43 #include "utilities/ticks.inline.hpp" |
1972 | 44 #include "utilities/xmlstream.hpp" |
0 | 45 |
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46 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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47 |
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48 #ifdef ASSERT |
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49 |
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50 #define SWEEP(nm) record_sweep(nm, __LINE__) |
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51 // Sweeper logging code |
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52 class SweeperRecord { |
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53 public: |
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54 int traversal; |
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55 int invocation; |
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56 int compile_id; |
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57 long traversal_mark; |
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58 int state; |
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59 const char* kind; |
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60 address vep; |
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61 address uep; |
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62 int line; |
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63 |
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64 void print() { |
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65 tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = " |
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66 PTR_FORMAT " state = %d traversal_mark %d line = %d", |
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67 traversal, |
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68 invocation, |
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69 compile_id, |
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70 kind == NULL ? "" : kind, |
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71 uep, |
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72 vep, |
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73 state, |
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74 traversal_mark, |
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75 line); |
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76 } |
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77 }; |
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78 |
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79 static int _sweep_index = 0; |
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80 static SweeperRecord* _records = NULL; |
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81 |
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82 void NMethodSweeper::report_events(int id, address entry) { |
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83 if (_records != NULL) { |
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84 for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
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85 if (_records[i].uep == entry || |
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86 _records[i].vep == entry || |
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87 _records[i].compile_id == id) { |
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88 _records[i].print(); |
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89 } |
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90 } |
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91 for (int i = 0; i < _sweep_index; i++) { |
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92 if (_records[i].uep == entry || |
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93 _records[i].vep == entry || |
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94 _records[i].compile_id == id) { |
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95 _records[i].print(); |
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96 } |
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97 } |
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98 } |
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99 } |
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100 |
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101 void NMethodSweeper::report_events() { |
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102 if (_records != NULL) { |
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103 for (int i = _sweep_index; i < SweeperLogEntries; 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 for (int i = 0; i < _sweep_index; i++) { |
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109 // skip empty records |
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110 if (_records[i].vep == NULL) continue; |
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111 _records[i].print(); |
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112 } |
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113 } |
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114 } |
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115 |
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116 void NMethodSweeper::record_sweep(nmethod* nm, int line) { |
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117 if (_records != NULL) { |
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118 _records[_sweep_index].traversal = _traversals; |
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119 _records[_sweep_index].traversal_mark = nm->_stack_traversal_mark; |
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120 _records[_sweep_index].invocation = _sweep_fractions_left; |
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121 _records[_sweep_index].compile_id = nm->compile_id(); |
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122 _records[_sweep_index].kind = nm->compile_kind(); |
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123 _records[_sweep_index].state = nm->_state; |
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124 _records[_sweep_index].vep = nm->verified_entry_point(); |
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125 _records[_sweep_index].uep = nm->entry_point(); |
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126 _records[_sweep_index].line = line; |
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127 _sweep_index = (_sweep_index + 1) % SweeperLogEntries; |
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128 } |
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129 } |
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130 #else |
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131 #define SWEEP(nm) |
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132 #endif |
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133 |
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134 nmethod* NMethodSweeper::_current = NULL; // Current nmethod |
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135 long NMethodSweeper::_traversals = 0; // Stack scan count, also sweep ID. |
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136 long NMethodSweeper::_total_nof_code_cache_sweeps = 0; // Total number of full sweeps of the code cache |
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137 long NMethodSweeper::_time_counter = 0; // Virtual time used to periodically invoke sweeper |
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138 long NMethodSweeper::_last_sweep = 0; // Value of _time_counter when the last sweep happened |
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139 int NMethodSweeper::_seen = 0; // Nof. nmethod we have currently processed in current pass of CodeCache |
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140 int NMethodSweeper::_flushed_count = 0; // Nof. nmethods flushed in current sweep |
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141 int NMethodSweeper::_zombified_count = 0; // Nof. nmethods made zombie in current sweep |
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142 int NMethodSweeper::_marked_for_reclamation_count = 0; // Nof. nmethods marked for reclaim in current sweep |
0 | 143 |
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144 volatile bool NMethodSweeper::_should_sweep = true; // Indicates if we should invoke the sweeper |
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145 volatile int NMethodSweeper::_sweep_fractions_left = 0; // Nof. invocations left until we are completed with this pass |
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146 volatile int NMethodSweeper::_sweep_started = 0; // Flag to control conc sweeper |
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147 volatile int NMethodSweeper::_bytes_changed = 0; // Counts the total nmethod size if the nmethod changed from: |
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148 // 1) alive -> not_entrant |
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149 // 2) not_entrant -> zombie |
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150 // 3) zombie -> marked_for_reclamation |
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151 int NMethodSweeper::_hotness_counter_reset_val = 0; |
0 | 152 |
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153 long NMethodSweeper::_total_nof_methods_reclaimed = 0; // Accumulated nof methods flushed |
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154 long NMethodSweeper::_total_nof_c2_methods_reclaimed = 0; // Accumulated nof methods flushed |
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155 size_t NMethodSweeper::_total_flushed_size = 0; // Total number of bytes flushed from the code cache |
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156 Tickspan NMethodSweeper::_total_time_sweeping; // Accumulated time sweeping |
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157 Tickspan NMethodSweeper::_total_time_this_sweep; // Total time this sweep |
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158 Tickspan NMethodSweeper::_peak_sweep_time; // Peak time for a full sweep |
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159 Tickspan NMethodSweeper::_peak_sweep_fraction_time; // Peak time sweeping one fraction |
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160 |
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161 |
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989 | 163 class MarkActivationClosure: public CodeBlobClosure { |
164 public: | |
165 virtual void do_code_blob(CodeBlob* cb) { | |
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166 if (cb->is_nmethod()) { |
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167 nmethod* nm = (nmethod*)cb; |
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168 nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val()); |
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169 // If we see an activation belonging to a non_entrant nmethod, we mark it. |
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170 if (nm->is_not_entrant()) { |
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171 nm->mark_as_seen_on_stack(); |
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172 } |
989 | 173 } |
174 } | |
175 }; | |
176 static MarkActivationClosure mark_activation_closure; | |
177 | |
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178 class SetHotnessClosure: public CodeBlobClosure { |
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179 public: |
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180 virtual void do_code_blob(CodeBlob* cb) { |
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181 if (cb->is_nmethod()) { |
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182 nmethod* nm = (nmethod*)cb; |
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183 nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val()); |
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184 } |
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185 } |
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186 }; |
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187 static SetHotnessClosure set_hotness_closure; |
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188 |
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189 |
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190 int NMethodSweeper::hotness_counter_reset_val() { |
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191 if (_hotness_counter_reset_val == 0) { |
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192 _hotness_counter_reset_val = (ReservedCodeCacheSize < M) ? 1 : (ReservedCodeCacheSize / M) * 2; |
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193 } |
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194 return _hotness_counter_reset_val; |
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195 } |
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196 bool NMethodSweeper::sweep_in_progress() { |
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197 return (_current != NULL); |
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198 } |
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199 |
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200 // Scans the stacks of all Java threads and marks activations of not-entrant methods. |
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201 // No need to synchronize access, since 'mark_active_nmethods' is always executed at a |
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202 // safepoint. |
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203 void NMethodSweeper::mark_active_nmethods() { |
0 | 204 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); |
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205 // If we do not want to reclaim not-entrant or zombie methods there is no need |
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206 // to scan stacks |
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207 if (!MethodFlushing) { |
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208 return; |
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209 } |
0 | 210 |
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211 // Increase time so that we can estimate when to invoke the sweeper again. |
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212 _time_counter++; |
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213 |
0 | 214 // Check for restart |
215 assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid"); | |
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216 if (!sweep_in_progress()) { |
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217 _seen = 0; |
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218 _sweep_fractions_left = NmethodSweepFraction; |
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219 _current = CodeCache::first_nmethod(); |
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220 _traversals += 1; |
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221 _total_time_this_sweep = Tickspan(); |
10405 | 222 |
0 | 223 if (PrintMethodFlushing) { |
224 tty->print_cr("### Sweep: stack traversal %d", _traversals); | |
225 } | |
989 | 226 Threads::nmethods_do(&mark_activation_closure); |
0 | 227 |
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228 } else { |
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229 // Only set hotness counter |
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230 Threads::nmethods_do(&set_hotness_closure); |
0 | 231 } |
232 | |
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233 OrderAccess::storestore(); |
0 | 234 } |
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235 /** |
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236 * This function invokes the sweeper if at least one of the three conditions is met: |
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237 * (1) The code cache is getting full |
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238 * (2) There are sufficient state changes in/since the last sweep. |
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239 * (3) We have not been sweeping for 'some time' |
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240 */ |
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241 void NMethodSweeper::possibly_sweep() { |
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242 assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode"); |
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243 // Only compiler threads are allowed to sweep |
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244 if (!MethodFlushing || !sweep_in_progress() || !Thread::current()->is_Compiler_thread()) { |
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245 return; |
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246 } |
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247 |
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248 // If there was no state change while nmethod sweeping, 'should_sweep' will be false. |
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249 // This is one of the two places where should_sweep can be set to true. The general |
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250 // idea is as follows: If there is enough free space in the code cache, there is no |
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251 // need to invoke the sweeper. The following formula (which determines whether to invoke |
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252 // the sweeper or not) depends on the assumption that for larger ReservedCodeCacheSizes |
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253 // we need less frequent sweeps than for smaller ReservedCodecCacheSizes. Furthermore, |
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254 // the formula considers how much space in the code cache is currently used. Here are |
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255 // some examples that will (hopefully) help in understanding. |
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256 // |
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257 // Small ReservedCodeCacheSizes: (e.g., < 16M) We invoke the sweeper every time, since |
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258 // the result of the division is 0. This |
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259 // keeps the used code cache size small |
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260 // (important for embedded Java) |
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261 // Large ReservedCodeCacheSize : (e.g., 256M + code cache is 10% full). The formula |
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262 // computes: (256 / 16) - 1 = 15 |
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263 // As a result, we invoke the sweeper after |
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264 // 15 invocations of 'mark_active_nmethods. |
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265 // Large ReservedCodeCacheSize: (e.g., 256M + code Cache is 90% full). The formula |
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266 // computes: (256 / 16) - 10 = 6. |
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267 if (!_should_sweep) { |
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268 const int time_since_last_sweep = _time_counter - _last_sweep; |
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269 // ReservedCodeCacheSize has an 'unsigned' type. We need a 'signed' type for max_wait_time, |
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270 // since 'time_since_last_sweep' can be larger than 'max_wait_time'. If that happens using |
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271 // an unsigned type would cause an underflow (wait_until_next_sweep becomes a large positive |
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272 // value) that disables the intended periodic sweeps. |
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273 const int max_wait_time = ReservedCodeCacheSize / (16 * M); |
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274 double wait_until_next_sweep = max_wait_time - time_since_last_sweep - CodeCache::reverse_free_ratio(); |
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275 assert(wait_until_next_sweep <= (double)max_wait_time, "Calculation of code cache sweeper interval is incorrect"); |
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276 |
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277 if ((wait_until_next_sweep <= 0.0) || !CompileBroker::should_compile_new_jobs()) { |
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278 _should_sweep = true; |
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279 } |
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280 } |
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281 |
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282 if (_should_sweep && _sweep_fractions_left > 0) { |
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283 // Only one thread at a time will sweep |
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284 jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 ); |
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285 if (old != 0) { |
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286 return; |
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287 } |
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288 #ifdef ASSERT |
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289 if (LogSweeper && _records == NULL) { |
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290 // Create the ring buffer for the logging code |
6197 | 291 _records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC); |
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292 memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries); |
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293 } |
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294 #endif |
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295 |
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296 if (_sweep_fractions_left > 0) { |
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297 sweep_code_cache(); |
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298 _sweep_fractions_left--; |
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299 } |
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300 |
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301 // We are done with sweeping the code cache once. |
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302 if (_sweep_fractions_left == 0) { |
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303 _total_nof_code_cache_sweeps++; |
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304 _last_sweep = _time_counter; |
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305 // Reset flag; temporarily disables sweeper |
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306 _should_sweep = false; |
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307 // If there was enough state change, 'possibly_enable_sweeper()' |
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308 // sets '_should_sweep' to true |
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309 possibly_enable_sweeper(); |
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310 // Reset _bytes_changed only if there was enough state change. _bytes_changed |
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311 // can further increase by calls to 'report_state_change'. |
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312 if (_should_sweep) { |
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313 _bytes_changed = 0; |
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314 } |
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315 } |
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316 // Release work, because another compiler thread could continue. |
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317 OrderAccess::release_store((int*)&_sweep_started, 0); |
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318 } |
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319 } |
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320 |
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321 void NMethodSweeper::sweep_code_cache() { |
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322 Ticks sweep_start_counter = Ticks::now(); |
10405 | 323 |
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324 _flushed_count = 0; |
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325 _zombified_count = 0; |
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326 _marked_for_reclamation_count = 0; |
10405 | 327 |
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328 if (PrintMethodFlushing && Verbose) { |
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329 tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _sweep_fractions_left); |
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330 } |
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331 |
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332 if (!CompileBroker::should_compile_new_jobs()) { |
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333 // If we have turned off compilations we might as well do full sweeps |
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334 // in order to reach the clean state faster. Otherwise the sleeping compiler |
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335 // threads will slow down sweeping. |
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336 _sweep_fractions_left = 1; |
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337 } |
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338 |
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339 // We want to visit all nmethods after NmethodSweepFraction |
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340 // invocations so divide the remaining number of nmethods by the |
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341 // remaining number of invocations. This is only an estimate since |
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342 // the number of nmethods changes during the sweep so the final |
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343 // stage must iterate until it there are no more nmethods. |
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344 int todo = (CodeCache::nof_nmethods() - _seen) / _sweep_fractions_left; |
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345 int swept_count = 0; |
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346 |
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347 |
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348 assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here"); |
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349 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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350 |
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351 int freed_memory = 0; |
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352 { |
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353 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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354 |
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355 // The last invocation iterates until there are no more nmethods |
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356 for (int i = 0; (i < todo || _sweep_fractions_left == 1) && _current != NULL; i++) { |
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357 swept_count++; |
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358 if (SafepointSynchronize::is_synchronizing()) { // Safepoint request |
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359 if (PrintMethodFlushing && Verbose) { |
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360 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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361 } |
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362 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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363 |
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364 assert(Thread::current()->is_Java_thread(), "should be java thread"); |
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365 JavaThread* thread = (JavaThread*)Thread::current(); |
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366 ThreadBlockInVM tbivm(thread); |
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367 thread->java_suspend_self(); |
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368 } |
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369 // Since we will give up the CodeCache_lock, always skip ahead |
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370 // to the next nmethod. Other blobs can be deleted by other |
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371 // threads but nmethods are only reclaimed by the sweeper. |
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372 nmethod* next = CodeCache::next_nmethod(_current); |
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373 |
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374 // Now ready to process nmethod and give up CodeCache_lock |
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375 { |
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376 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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377 freed_memory += process_nmethod(_current); |
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378 } |
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379 _seen++; |
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380 _current = next; |
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381 } |
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382 } |
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383 |
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384 assert(_sweep_fractions_left > 1 || _current == NULL, "must have scanned the whole cache"); |
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385 |
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386 const Ticks sweep_end_counter = Ticks::now(); |
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387 const Tickspan sweep_time = sweep_end_counter - sweep_start_counter; |
10405 | 388 _total_time_sweeping += sweep_time; |
389 _total_time_this_sweep += sweep_time; | |
390 _peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time); | |
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391 _total_flushed_size += freed_memory; |
10405 | 392 _total_nof_methods_reclaimed += _flushed_count; |
393 | |
394 EventSweepCodeCache event(UNTIMED); | |
395 if (event.should_commit()) { | |
396 event.set_starttime(sweep_start_counter); | |
397 event.set_endtime(sweep_end_counter); | |
398 event.set_sweepIndex(_traversals); | |
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399 event.set_sweepFractionIndex(NmethodSweepFraction - _sweep_fractions_left + 1); |
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400 event.set_sweptCount(swept_count); |
10405 | 401 event.set_flushedCount(_flushed_count); |
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402 event.set_markedCount(_marked_for_reclamation_count); |
10405 | 403 event.set_zombifiedCount(_zombified_count); |
404 event.commit(); | |
405 } | |
406 | |
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407 #ifdef ASSERT |
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408 if(PrintMethodFlushing) { |
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409 tty->print_cr("### sweeper: sweep time(%d): " |
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410 INT64_FORMAT, _sweep_fractions_left, (jlong)sweep_time.value()); |
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411 } |
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412 #endif |
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413 |
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414 if (_sweep_fractions_left == 1) { |
10405 | 415 _peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep); |
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416 log_sweep("finished"); |
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417 } |
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418 |
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419 // Sweeper is the only case where memory is released, check here if it |
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420 // is time to restart the compiler. Only checking if there is a certain |
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421 // amount of free memory in the code cache might lead to re-enabling |
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422 // compilation although no memory has been released. For example, there are |
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423 // cases when compilation was disabled although there is 4MB (or more) free |
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424 // memory in the code cache. The reason is code cache fragmentation. Therefore, |
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425 // it only makes sense to re-enable compilation if we have actually freed memory. |
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426 // Note that typically several kB are released for sweeping 16MB of the code |
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427 // cache. As a result, 'freed_memory' > 0 to restart the compiler. |
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428 if (!CompileBroker::should_compile_new_jobs() && (freed_memory > 0)) { |
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429 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); |
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430 log_sweep("restart_compiler"); |
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431 } |
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432 } |
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433 |
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434 /** |
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435 * This function updates the sweeper statistics that keep track of nmethods |
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436 * state changes. If there is 'enough' state change, the sweeper is invoked |
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437 * as soon as possible. There can be data races on _bytes_changed. The data |
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438 * races are benign, since it does not matter if we loose a couple of bytes. |
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439 * In the worst case we call the sweeper a little later. Also, we are guaranteed |
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440 * to invoke the sweeper if the code cache gets full. |
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441 */ |
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442 void NMethodSweeper::report_state_change(nmethod* nm) { |
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443 _bytes_changed += nm->total_size(); |
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444 possibly_enable_sweeper(); |
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445 } |
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446 |
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447 /** |
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448 * Function determines if there was 'enough' state change in the code cache to invoke |
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449 * the sweeper again. Currently, we determine 'enough' as more than 1% state change in |
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450 * the code cache since the last sweep. |
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451 */ |
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452 void NMethodSweeper::possibly_enable_sweeper() { |
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453 double percent_changed = ((double)_bytes_changed / (double)ReservedCodeCacheSize) * 100; |
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454 if (percent_changed > 1.0) { |
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455 _should_sweep = true; |
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456 } |
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457 } |
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458 |
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459 class NMethodMarker: public StackObj { |
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460 private: |
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461 CompilerThread* _thread; |
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462 public: |
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463 NMethodMarker(nmethod* nm) { |
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464 _thread = CompilerThread::current(); |
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465 if (!nm->is_zombie() && !nm->is_unloaded()) { |
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466 // Only expose live nmethods for scanning |
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467 _thread->set_scanned_nmethod(nm); |
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468 } |
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469 } |
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470 ~NMethodMarker() { |
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471 _thread->set_scanned_nmethod(NULL); |
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472 } |
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473 }; |
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474 |
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475 void NMethodSweeper::release_nmethod(nmethod *nm) { |
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476 // Clean up any CompiledICHolders |
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477 { |
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478 ResourceMark rm; |
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479 MutexLocker ml_patch(CompiledIC_lock); |
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480 RelocIterator iter(nm); |
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481 while (iter.next()) { |
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482 if (iter.type() == relocInfo::virtual_call_type) { |
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483 CompiledIC::cleanup_call_site(iter.virtual_call_reloc()); |
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484 } |
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485 } |
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486 } |
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487 |
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488 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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489 nm->flush(); |
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490 } |
0 | 491 |
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492 int NMethodSweeper::process_nmethod(nmethod *nm) { |
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493 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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494 |
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495 int freed_memory = 0; |
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496 // Make sure this nmethod doesn't get unloaded during the scan, |
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497 // since safepoints may happen during acquired below locks. |
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498 NMethodMarker nmm(nm); |
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499 SWEEP(nm); |
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500 |
0 | 501 // Skip methods that are currently referenced by the VM |
502 if (nm->is_locked_by_vm()) { | |
503 // But still remember to clean-up inline caches for alive nmethods | |
504 if (nm->is_alive()) { | |
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505 // Clean inline caches that point to zombie/non-entrant methods |
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506 MutexLocker cl(CompiledIC_lock); |
0 | 507 nm->cleanup_inline_caches(); |
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508 SWEEP(nm); |
0 | 509 } |
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510 return freed_memory; |
0 | 511 } |
512 | |
513 if (nm->is_zombie()) { | |
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514 // If it is the first time we see nmethod then we mark it. Otherwise, |
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515 // we reclaim it. When we have seen a zombie method twice, we know that |
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516 // there are no inline caches that refer to it. |
0 | 517 if (nm->is_marked_for_reclamation()) { |
518 assert(!nm->is_locked_by_vm(), "must not flush locked nmethods"); | |
941 | 519 if (PrintMethodFlushing && Verbose) { |
1202 | 520 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm); |
941 | 521 } |
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522 freed_memory = nm->total_size(); |
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523 if (nm->is_compiled_by_c2()) { |
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524 _total_nof_c2_methods_reclaimed++; |
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525 } |
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526 release_nmethod(nm); |
10405 | 527 _flushed_count++; |
0 | 528 } else { |
941 | 529 if (PrintMethodFlushing && Verbose) { |
1202 | 530 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm); |
941 | 531 } |
0 | 532 nm->mark_for_reclamation(); |
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533 // Keep track of code cache state change |
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534 _bytes_changed += nm->total_size(); |
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535 _marked_for_reclamation_count++; |
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536 SWEEP(nm); |
0 | 537 } |
538 } else if (nm->is_not_entrant()) { | |
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539 // If there are no current activations of this method on the |
0 | 540 // stack we can safely convert it to a zombie method |
541 if (nm->can_not_entrant_be_converted()) { | |
941 | 542 if (PrintMethodFlushing && Verbose) { |
1202 | 543 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm); |
941 | 544 } |
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545 // Code cache state change is tracked in make_zombie() |
0 | 546 nm->make_zombie(); |
10405 | 547 _zombified_count++; |
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548 SWEEP(nm); |
0 | 549 } else { |
550 // Still alive, clean up its inline caches | |
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551 MutexLocker cl(CompiledIC_lock); |
0 | 552 nm->cleanup_inline_caches(); |
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553 SWEEP(nm); |
0 | 554 } |
555 } else if (nm->is_unloaded()) { | |
556 // Unloaded code, just make it a zombie | |
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557 if (PrintMethodFlushing && Verbose) { |
1202 | 558 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm); |
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559 } |
941 | 560 if (nm->is_osr_method()) { |
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561 SWEEP(nm); |
0 | 562 // No inline caches will ever point to osr methods, so we can just remove it |
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563 freed_memory = nm->total_size(); |
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564 if (nm->is_compiled_by_c2()) { |
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565 _total_nof_c2_methods_reclaimed++; |
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566 } |
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567 release_nmethod(nm); |
10405 | 568 _flushed_count++; |
0 | 569 } else { |
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570 // Code cache state change is tracked in make_zombie() |
0 | 571 nm->make_zombie(); |
10405 | 572 _zombified_count++; |
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573 SWEEP(nm); |
0 | 574 } |
575 } else { | |
1202 | 576 if (UseCodeCacheFlushing) { |
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577 if (!nm->is_locked_by_vm() && !nm->is_osr_method() && !nm->is_native_method()) { |
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578 // Do not make native methods and OSR-methods not-entrant |
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579 nm->dec_hotness_counter(); |
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580 // Get the initial value of the hotness counter. This value depends on the |
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581 // ReservedCodeCacheSize |
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582 int reset_val = hotness_counter_reset_val(); |
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583 int time_since_reset = reset_val - nm->hotness_counter(); |
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584 double threshold = -reset_val + (CodeCache::reverse_free_ratio() * NmethodSweepActivity); |
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585 // The less free space in the code cache we have - the bigger reverse_free_ratio() is. |
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586 // I.e., 'threshold' increases with lower available space in the code cache and a higher |
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587 // NmethodSweepActivity. If the current hotness counter - which decreases from its initial |
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588 // value until it is reset by stack walking - is smaller than the computed threshold, the |
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589 // corresponding nmethod is considered for removal. |
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590 if ((NmethodSweepActivity > 0) && (nm->hotness_counter() < threshold) && (time_since_reset > 10)) { |
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591 // A method is marked as not-entrant if the method is |
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592 // 1) 'old enough': nm->hotness_counter() < threshold |
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593 // 2) The method was in_use for a minimum amount of time: (time_since_reset > 10) |
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594 // The second condition is necessary if we are dealing with very small code cache |
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595 // sizes (e.g., <10m) and the code cache size is too small to hold all hot methods. |
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596 // The second condition ensures that methods are not immediately made not-entrant |
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597 // after compilation. |
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598 nm->make_not_entrant(); |
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599 // Code cache state change is tracked in make_not_entrant() |
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600 if (PrintMethodFlushing && Verbose) { |
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601 tty->print_cr("### Nmethod %d/" PTR_FORMAT "made not-entrant: hotness counter %d/%d threshold %f", |
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602 nm->compile_id(), nm, nm->hotness_counter(), reset_val, threshold); |
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603 } |
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604 } |
1202 | 605 } |
606 } | |
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607 // Clean-up all inline caches that point to zombie/non-reentrant methods |
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608 MutexLocker cl(CompiledIC_lock); |
0 | 609 nm->cleanup_inline_caches(); |
3384
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610 SWEEP(nm); |
0 | 611 } |
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612 return freed_memory; |
1202 | 613 } |
614 | |
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615 // Print out some state information about the current sweep and the |
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616 // state of the code cache if it's requested. |
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617 void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) { |
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618 if (PrintMethodFlushing) { |
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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; |
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625 tty->print("### sweeper: %s ", msg); |
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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 tty->vprint(format, ap); |
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630 va_end(ap); |
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631 } |
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632 tty->print_cr("%s", s.as_string()); |
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633 } |
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634 |
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635 if (LogCompilation && (xtty != NULL)) { |
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636 stringStream s; |
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637 // Dump code cache state into a buffer before locking the tty, |
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638 // because log_state() will use locks causing lock conflicts. |
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639 CodeCache::log_state(&s); |
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640 |
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641 ttyLocker ttyl; |
1646 | 642 xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count()); |
1644
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643 if (format != NULL) { |
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644 va_list ap; |
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645 va_start(ap, format); |
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646 xtty->vprint(format, ap); |
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647 va_end(ap); |
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648 } |
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649 xtty->print("%s", s.as_string()); |
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650 xtty->stamp(); |
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651 xtty->end_elem(); |
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652 } |
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653 } |
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654 |
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655 void NMethodSweeper::print() { |
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656 ttyLocker ttyl; |
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657 tty->print_cr("Code cache sweeper statistics:"); |
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658 tty->print_cr(" Total sweep time: %1.0lfms", (double)_total_time_sweeping.value()/1000000); |
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659 tty->print_cr(" Total number of full sweeps: %ld", _total_nof_code_cache_sweeps); |
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660 tty->print_cr(" Total number of flushed methods: %ld(%ld C2 methods)", _total_nof_methods_reclaimed, |
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661 _total_nof_c2_methods_reclaimed); |
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662 tty->print_cr(" Total size of flushed methods: " SIZE_FORMAT "kB", _total_flushed_size/K); |
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663 } |