Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/sweeper.cpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
author | sla |
---|---|
date | Mon, 10 Jun 2013 11:30:51 +0200 |
parents | 0cfa93c2fcc4 |
children | 836a62f43af9 ab274453d37f |
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" |
41 #include "utilities/xmlstream.hpp" | |
0 | 42 |
3384
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43 #ifdef ASSERT |
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44 |
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45 #define SWEEP(nm) record_sweep(nm, __LINE__) |
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46 // Sweeper logging code |
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47 class SweeperRecord { |
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48 public: |
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49 int traversal; |
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50 int invocation; |
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51 int compile_id; |
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52 long traversal_mark; |
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53 int state; |
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54 const char* kind; |
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55 address vep; |
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56 address uep; |
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57 int line; |
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58 |
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59 void print() { |
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60 tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = " |
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61 PTR_FORMAT " state = %d traversal_mark %d line = %d", |
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62 traversal, |
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63 invocation, |
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64 compile_id, |
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65 kind == NULL ? "" : kind, |
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66 uep, |
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67 vep, |
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68 state, |
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69 traversal_mark, |
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70 line); |
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71 } |
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72 }; |
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73 |
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74 static int _sweep_index = 0; |
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75 static SweeperRecord* _records = NULL; |
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76 |
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77 void NMethodSweeper::report_events(int id, address entry) { |
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78 if (_records != NULL) { |
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79 for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
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80 if (_records[i].uep == entry || |
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81 _records[i].vep == entry || |
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82 _records[i].compile_id == id) { |
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83 _records[i].print(); |
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84 } |
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85 } |
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86 for (int i = 0; i < _sweep_index; i++) { |
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87 if (_records[i].uep == entry || |
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88 _records[i].vep == entry || |
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89 _records[i].compile_id == id) { |
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90 _records[i].print(); |
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91 } |
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92 } |
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93 } |
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94 } |
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95 |
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96 void NMethodSweeper::report_events() { |
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97 if (_records != NULL) { |
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98 for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
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99 // skip empty records |
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100 if (_records[i].vep == NULL) continue; |
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101 _records[i].print(); |
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102 } |
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103 for (int i = 0; i < _sweep_index; i++) { |
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104 // skip empty records |
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105 if (_records[i].vep == NULL) continue; |
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106 _records[i].print(); |
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107 } |
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108 } |
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109 } |
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110 |
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111 void NMethodSweeper::record_sweep(nmethod* nm, int line) { |
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112 if (_records != NULL) { |
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113 _records[_sweep_index].traversal = _traversals; |
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114 _records[_sweep_index].traversal_mark = nm->_stack_traversal_mark; |
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115 _records[_sweep_index].invocation = _invocations; |
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116 _records[_sweep_index].compile_id = nm->compile_id(); |
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117 _records[_sweep_index].kind = nm->compile_kind(); |
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118 _records[_sweep_index].state = nm->_state; |
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119 _records[_sweep_index].vep = nm->verified_entry_point(); |
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120 _records[_sweep_index].uep = nm->entry_point(); |
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121 _records[_sweep_index].line = line; |
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122 |
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123 _sweep_index = (_sweep_index + 1) % SweeperLogEntries; |
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124 } |
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125 } |
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126 #else |
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127 #define SWEEP(nm) |
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128 #endif |
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129 |
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130 |
0 | 131 long NMethodSweeper::_traversals = 0; // No. of stack traversals performed |
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132 nmethod* NMethodSweeper::_current = NULL; // Current nmethod |
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133 int NMethodSweeper::_seen = 0 ; // No. of nmethods we have currently processed in current pass of CodeCache |
10405 | 134 int NMethodSweeper::_flushed_count = 0; // Nof. nmethods flushed in current sweep |
135 int NMethodSweeper::_zombified_count = 0; // Nof. nmethods made zombie in current sweep | |
136 int NMethodSweeper::_marked_count = 0; // Nof. nmethods marked for reclaim in current sweep | |
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137 |
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138 volatile int NMethodSweeper::_invocations = 0; // No. of invocations left until we are completed with this pass |
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139 volatile int NMethodSweeper::_sweep_started = 0; // Whether a sweep is in progress. |
0 | 140 |
141 jint NMethodSweeper::_locked_seen = 0; | |
142 jint NMethodSweeper::_not_entrant_seen_on_stack = 0; | |
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143 bool NMethodSweeper::_resweep = false; |
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144 jint NMethodSweeper::_flush_token = 0; |
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145 jlong NMethodSweeper::_last_full_flush_time = 0; |
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146 int NMethodSweeper::_highest_marked = 0; |
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147 int NMethodSweeper::_dead_compile_ids = 0; |
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148 long NMethodSweeper::_last_flush_traversal_id = 0; |
0 | 149 |
10405 | 150 int NMethodSweeper::_number_of_flushes = 0; // Total of full traversals caused by full cache |
151 int NMethodSweeper::_total_nof_methods_reclaimed = 0; | |
152 jlong NMethodSweeper::_total_time_sweeping = 0; | |
153 jlong NMethodSweeper::_total_time_this_sweep = 0; | |
154 jlong NMethodSweeper::_peak_sweep_time = 0; | |
155 jlong NMethodSweeper::_peak_sweep_fraction_time = 0; | |
156 jlong NMethodSweeper::_total_disconnect_time = 0; | |
157 jlong NMethodSweeper::_peak_disconnect_time = 0; | |
158 | |
989 | 159 class MarkActivationClosure: public CodeBlobClosure { |
160 public: | |
161 virtual void do_code_blob(CodeBlob* cb) { | |
162 // If we see an activation belonging to a non_entrant nmethod, we mark it. | |
163 if (cb->is_nmethod() && ((nmethod*)cb)->is_not_entrant()) { | |
164 ((nmethod*)cb)->mark_as_seen_on_stack(); | |
165 } | |
166 } | |
167 }; | |
168 static MarkActivationClosure mark_activation_closure; | |
169 | |
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170 bool NMethodSweeper::sweep_in_progress() { |
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171 return (_current != NULL); |
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172 } |
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173 |
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174 void NMethodSweeper::scan_stacks() { |
0 | 175 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); |
176 if (!MethodFlushing) return; | |
177 | |
178 // No need to synchronize access, since this is always executed at a | |
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179 // safepoint. |
0 | 180 |
181 // Make sure CompiledIC_lock in unlocked, since we might update some | |
182 // inline caches. If it is, we just bail-out and try later. | |
183 if (CompiledIC_lock->is_locked() || Patching_lock->is_locked()) return; | |
184 | |
185 // Check for restart | |
186 assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid"); | |
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187 if (!sweep_in_progress() && _resweep) { |
0 | 188 _seen = 0; |
189 _invocations = NmethodSweepFraction; | |
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190 _current = CodeCache::first_nmethod(); |
0 | 191 _traversals += 1; |
10405 | 192 _total_time_this_sweep = 0; |
193 | |
0 | 194 if (PrintMethodFlushing) { |
195 tty->print_cr("### Sweep: stack traversal %d", _traversals); | |
196 } | |
989 | 197 Threads::nmethods_do(&mark_activation_closure); |
0 | 198 |
199 // reset the flags since we started a scan from the beginning. | |
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200 _resweep = false; |
0 | 201 _locked_seen = 0; |
202 _not_entrant_seen_on_stack = 0; | |
203 } | |
204 | |
1202 | 205 if (UseCodeCacheFlushing) { |
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206 // only allow new flushes after the interval is complete. |
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207 jlong now = os::javaTimeMillis(); |
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208 jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000; |
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209 jlong curr_interval = now - _last_full_flush_time; |
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210 if (curr_interval > max_interval) { |
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211 _flush_token = 0; |
1202 | 212 } |
213 | |
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214 if (!CodeCache::needs_flushing() && !CompileBroker::should_compile_new_jobs()) { |
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215 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); |
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216 log_sweep("restart_compiler"); |
1202 | 217 } |
218 } | |
0 | 219 } |
220 | |
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221 void NMethodSweeper::possibly_sweep() { |
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222 assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode"); |
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223 if (!MethodFlushing || !sweep_in_progress()) return; |
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224 |
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225 if (_invocations > 0) { |
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226 // Only one thread at a time will sweep |
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227 jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 ); |
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228 if (old != 0) { |
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229 return; |
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230 } |
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231 #ifdef ASSERT |
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232 if (LogSweeper && _records == NULL) { |
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233 // Create the ring buffer for the logging code |
6197 | 234 _records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC); |
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235 memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries); |
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236 } |
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237 #endif |
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238 if (_invocations > 0) { |
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239 sweep_code_cache(); |
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240 _invocations--; |
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241 } |
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242 _sweep_started = 0; |
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243 } |
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244 } |
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245 |
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246 void NMethodSweeper::sweep_code_cache() { |
10405 | 247 |
248 jlong sweep_start_counter = os::elapsed_counter(); | |
249 | |
250 _flushed_count = 0; | |
251 _zombified_count = 0; | |
252 _marked_count = 0; | |
253 | |
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254 if (PrintMethodFlushing && Verbose) { |
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255 tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _invocations); |
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256 } |
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257 |
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258 if (!CompileBroker::should_compile_new_jobs()) { |
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259 // If we have turned off compilations we might as well do full sweeps |
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260 // in order to reach the clean state faster. Otherwise the sleeping compiler |
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261 // threads will slow down sweeping. After a few iterations the cache |
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262 // will be clean and sweeping stops (_resweep will not be set) |
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263 _invocations = 1; |
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264 } |
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265 |
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266 // We want to visit all nmethods after NmethodSweepFraction |
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267 // invocations so divide the remaining number of nmethods by the |
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268 // remaining number of invocations. This is only an estimate since |
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269 // the number of nmethods changes during the sweep so the final |
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270 // stage must iterate until it there are no more nmethods. |
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271 int todo = (CodeCache::nof_nmethods() - _seen) / _invocations; |
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272 |
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273 assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here"); |
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274 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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275 |
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276 { |
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277 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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278 |
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279 // The last invocation iterates until there are no more nmethods |
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280 for (int i = 0; (i < todo || _invocations == 1) && _current != NULL; i++) { |
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281 if (SafepointSynchronize::is_synchronizing()) { // Safepoint request |
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282 if (PrintMethodFlushing && Verbose) { |
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283 tty->print_cr("### Sweep at %d out of %d, invocation: %d, yielding to safepoint", _seen, CodeCache::nof_nmethods(), _invocations); |
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284 } |
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285 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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286 |
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287 assert(Thread::current()->is_Java_thread(), "should be java thread"); |
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288 JavaThread* thread = (JavaThread*)Thread::current(); |
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289 ThreadBlockInVM tbivm(thread); |
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290 thread->java_suspend_self(); |
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291 } |
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292 // Since we will give up the CodeCache_lock, always skip ahead |
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293 // to the next nmethod. Other blobs can be deleted by other |
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294 // threads but nmethods are only reclaimed by the sweeper. |
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295 nmethod* next = CodeCache::next_nmethod(_current); |
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296 |
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297 // Now ready to process nmethod and give up CodeCache_lock |
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298 { |
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299 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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300 process_nmethod(_current); |
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301 } |
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302 _seen++; |
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303 _current = next; |
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304 } |
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305 } |
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306 |
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307 assert(_invocations > 1 || _current == NULL, "must have scanned the whole cache"); |
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308 |
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309 if (!sweep_in_progress() && !_resweep && (_locked_seen || _not_entrant_seen_on_stack)) { |
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310 // we've completed a scan without making progress but there were |
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311 // nmethods we were unable to process either because they were |
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312 // locked or were still on stack. We don't have to aggresively |
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313 // clean them up so just stop scanning. We could scan once more |
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314 // but that complicates the control logic and it's unlikely to |
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315 // matter much. |
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316 if (PrintMethodFlushing) { |
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317 tty->print_cr("### Couldn't make progress on some nmethods so stopping sweep"); |
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318 } |
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319 } |
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320 |
10405 | 321 jlong sweep_end_counter = os::elapsed_counter(); |
322 jlong sweep_time = sweep_end_counter - sweep_start_counter; | |
323 _total_time_sweeping += sweep_time; | |
324 _total_time_this_sweep += sweep_time; | |
325 _peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time); | |
326 _total_nof_methods_reclaimed += _flushed_count; | |
327 | |
328 EventSweepCodeCache event(UNTIMED); | |
329 if (event.should_commit()) { | |
330 event.set_starttime(sweep_start_counter); | |
331 event.set_endtime(sweep_end_counter); | |
332 event.set_sweepIndex(_traversals); | |
333 event.set_sweepFractionIndex(NmethodSweepFraction - _invocations + 1); | |
334 event.set_sweptCount(todo); | |
335 event.set_flushedCount(_flushed_count); | |
336 event.set_markedCount(_marked_count); | |
337 event.set_zombifiedCount(_zombified_count); | |
338 event.commit(); | |
339 } | |
340 | |
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341 #ifdef ASSERT |
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342 if(PrintMethodFlushing) { |
10405 | 343 tty->print_cr("### sweeper: sweep time(%d): " INT64_FORMAT, _invocations, (jlong)sweep_time); |
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344 } |
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345 #endif |
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346 |
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347 if (_invocations == 1) { |
10405 | 348 _peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep); |
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349 log_sweep("finished"); |
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350 } |
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351 |
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352 // Sweeper is the only case where memory is released, |
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353 // check here if it is time to restart the compiler. |
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354 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs() && !CodeCache::needs_flushing()) { |
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355 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); |
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356 log_sweep("restart_compiler"); |
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357 } |
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358 } |
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359 |
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360 class NMethodMarker: public StackObj { |
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361 private: |
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362 CompilerThread* _thread; |
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363 public: |
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364 NMethodMarker(nmethod* nm) { |
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365 _thread = CompilerThread::current(); |
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366 if (!nm->is_zombie() && !nm->is_unloaded()) { |
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367 // Only expose live nmethods for scanning |
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368 _thread->set_scanned_nmethod(nm); |
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369 } |
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370 } |
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371 ~NMethodMarker() { |
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372 _thread->set_scanned_nmethod(NULL); |
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373 } |
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374 }; |
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375 |
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376 void NMethodSweeper::release_nmethod(nmethod *nm) { |
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377 // Clean up any CompiledICHolders |
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378 { |
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379 ResourceMark rm; |
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380 MutexLocker ml_patch(CompiledIC_lock); |
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381 RelocIterator iter(nm); |
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382 while (iter.next()) { |
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383 if (iter.type() == relocInfo::virtual_call_type) { |
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384 CompiledIC::cleanup_call_site(iter.virtual_call_reloc()); |
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385 } |
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386 } |
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387 } |
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388 |
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389 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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390 nm->flush(); |
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391 } |
0 | 392 |
393 void NMethodSweeper::process_nmethod(nmethod *nm) { | |
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394 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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395 |
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396 // Make sure this nmethod doesn't get unloaded during the scan, |
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397 // since the locks acquired below might safepoint. |
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398 NMethodMarker nmm(nm); |
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399 |
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400 SWEEP(nm); |
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401 |
0 | 402 // Skip methods that are currently referenced by the VM |
403 if (nm->is_locked_by_vm()) { | |
404 // But still remember to clean-up inline caches for alive nmethods | |
405 if (nm->is_alive()) { | |
406 // Clean-up all inline caches that points to zombie/non-reentrant methods | |
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407 MutexLocker cl(CompiledIC_lock); |
0 | 408 nm->cleanup_inline_caches(); |
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409 SWEEP(nm); |
0 | 410 } else { |
411 _locked_seen++; | |
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412 SWEEP(nm); |
0 | 413 } |
414 return; | |
415 } | |
416 | |
417 if (nm->is_zombie()) { | |
418 // If it is first time, we see nmethod then we mark it. Otherwise, | |
419 // we reclame it. When we have seen a zombie method twice, we know that | |
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420 // there are no inline caches that refer to it. |
0 | 421 if (nm->is_marked_for_reclamation()) { |
422 assert(!nm->is_locked_by_vm(), "must not flush locked nmethods"); | |
941 | 423 if (PrintMethodFlushing && Verbose) { |
1202 | 424 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm); |
941 | 425 } |
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426 release_nmethod(nm); |
10405 | 427 _flushed_count++; |
0 | 428 } else { |
941 | 429 if (PrintMethodFlushing && Verbose) { |
1202 | 430 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm); |
941 | 431 } |
0 | 432 nm->mark_for_reclamation(); |
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433 _resweep = true; |
10405 | 434 _marked_count++; |
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435 SWEEP(nm); |
0 | 436 } |
437 } else if (nm->is_not_entrant()) { | |
438 // If there is no current activations of this method on the | |
439 // stack we can safely convert it to a zombie method | |
440 if (nm->can_not_entrant_be_converted()) { | |
941 | 441 if (PrintMethodFlushing && Verbose) { |
1202 | 442 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm); |
941 | 443 } |
0 | 444 nm->make_zombie(); |
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445 _resweep = true; |
10405 | 446 _zombified_count++; |
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447 SWEEP(nm); |
0 | 448 } else { |
449 // Still alive, clean up its inline caches | |
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450 MutexLocker cl(CompiledIC_lock); |
0 | 451 nm->cleanup_inline_caches(); |
452 // we coudn't transition this nmethod so don't immediately | |
453 // request a rescan. If this method stays on the stack for a | |
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454 // long time we don't want to keep rescanning the code cache. |
0 | 455 _not_entrant_seen_on_stack++; |
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456 SWEEP(nm); |
0 | 457 } |
458 } else if (nm->is_unloaded()) { | |
459 // Unloaded code, just make it a zombie | |
941 | 460 if (PrintMethodFlushing && Verbose) |
1202 | 461 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm); |
10405 | 462 |
941 | 463 if (nm->is_osr_method()) { |
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464 SWEEP(nm); |
0 | 465 // No inline caches will ever point to osr methods, so we can just remove it |
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466 release_nmethod(nm); |
10405 | 467 _flushed_count++; |
0 | 468 } else { |
469 nm->make_zombie(); | |
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470 _resweep = true; |
10405 | 471 _zombified_count++; |
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472 SWEEP(nm); |
0 | 473 } |
474 } else { | |
475 assert(nm->is_alive(), "should be alive"); | |
1202 | 476 |
477 if (UseCodeCacheFlushing) { | |
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478 if (nm->is_speculatively_disconnected() && !nm->is_locked_by_vm() && !nm->is_osr_method() && |
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479 (_traversals > _last_flush_traversal_id + 2) && (nm->compile_id() < _highest_marked)) { |
1202 | 480 // This method has not been called since the forced cleanup happened |
481 nm->make_not_entrant(); | |
482 } | |
483 } | |
484 | |
0 | 485 // Clean-up all inline caches that points to zombie/non-reentrant methods |
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486 MutexLocker cl(CompiledIC_lock); |
0 | 487 nm->cleanup_inline_caches(); |
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488 SWEEP(nm); |
0 | 489 } |
490 } | |
1202 | 491 |
492 // Code cache unloading: when compilers notice the code cache is getting full, | |
493 // they will call a vm op that comes here. This code attempts to speculatively | |
494 // unload the oldest half of the nmethods (based on the compile job id) by | |
495 // saving the old code in a list in the CodeCache. Then | |
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496 // execution resumes. If a method so marked is not called by the second sweeper |
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497 // stack traversal after the current one, the nmethod will be marked non-entrant and |
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498 // got rid of by normal sweeping. If the method is called, the Method*'s |
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499 // _code field is restored and the Method*/nmethod |
1202 | 500 // go back to their normal state. |
501 void NMethodSweeper::handle_full_code_cache(bool is_full) { | |
502 | |
503 if (is_full) { | |
504 // Since code cache is full, immediately stop new compiles | |
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505 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { |
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506 log_sweep("disable_compiler"); |
1202 | 507 } |
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508 } |
1202 | 509 |
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510 // Make sure only one thread can flush |
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511 // The token is reset after CodeCacheMinimumFlushInterval in scan stacks, |
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512 // no need to check the timeout here. |
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513 jint old = Atomic::cmpxchg( 1, &_flush_token, 0 ); |
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514 if (old != 0) { |
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515 return; |
1202 | 516 } |
517 | |
518 VM_HandleFullCodeCache op(is_full); | |
519 VMThread::execute(&op); | |
520 | |
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521 // resweep again as soon as possible |
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522 _resweep = true; |
1202 | 523 } |
524 | |
525 void NMethodSweeper::speculative_disconnect_nmethods(bool is_full) { | |
526 // If there was a race in detecting full code cache, only run | |
527 // one vm op for it or keep the compiler shut off | |
528 | |
10405 | 529 jlong disconnect_start_counter = os::elapsed_counter(); |
1202 | 530 |
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531 // Traverse the code cache trying to dump the oldest nmethods |
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532 int curr_max_comp_id = CompileBroker::get_compilation_id(); |
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533 int flush_target = ((curr_max_comp_id - _dead_compile_ids) / CodeCacheFlushingFraction) + _dead_compile_ids; |
1202 | 534 |
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535 log_sweep("start_cleaning"); |
1202 | 536 |
537 nmethod* nm = CodeCache::alive_nmethod(CodeCache::first()); | |
538 jint disconnected = 0; | |
539 jint made_not_entrant = 0; | |
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540 jint nmethod_count = 0; |
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541 |
1202 | 542 while ((nm != NULL)){ |
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543 int curr_comp_id = nm->compile_id(); |
1202 | 544 |
545 // OSR methods cannot be flushed like this. Also, don't flush native methods | |
546 // since they are part of the JDK in most cases | |
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547 if (!nm->is_osr_method() && !nm->is_locked_by_vm() && !nm->is_native_method()) { |
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548 |
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549 // only count methods that can be speculatively disconnected |
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550 nmethod_count++; |
1202 | 551 |
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552 if (nm->is_in_use() && (curr_comp_id < flush_target)) { |
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553 if ((nm->method()->code() == nm)) { |
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554 // This method has not been previously considered for |
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555 // unloading or it was restored already |
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556 CodeCache::speculatively_disconnect(nm); |
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557 disconnected++; |
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558 } else if (nm->is_speculatively_disconnected()) { |
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559 // This method was previously considered for preemptive unloading and was not called since then |
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560 CompilationPolicy::policy()->delay_compilation(nm->method()); |
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561 nm->make_not_entrant(); |
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562 made_not_entrant++; |
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563 } |
1202 | 564 |
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565 if (curr_comp_id > _highest_marked) { |
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566 _highest_marked = curr_comp_id; |
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567 } |
1202 | 568 } |
569 } | |
570 nm = CodeCache::alive_nmethod(CodeCache::next(nm)); | |
571 } | |
572 | |
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573 // remember how many compile_ids wheren't seen last flush. |
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574 _dead_compile_ids = curr_max_comp_id - nmethod_count; |
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575 |
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576 log_sweep("stop_cleaning", |
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577 "disconnected='" UINT32_FORMAT "' made_not_entrant='" UINT32_FORMAT "'", |
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578 disconnected, made_not_entrant); |
1202 | 579 |
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580 // Shut off compiler. Sweeper will start over with a new stack scan and |
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581 // traversal cycle and turn it back on if it clears enough space. |
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582 if (is_full) { |
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583 _last_full_flush_time = os::javaTimeMillis(); |
1202 | 584 } |
585 | |
10405 | 586 jlong disconnect_end_counter = os::elapsed_counter(); |
587 jlong disconnect_time = disconnect_end_counter - disconnect_start_counter; | |
588 _total_disconnect_time += disconnect_time; | |
589 _peak_disconnect_time = MAX2(disconnect_time, _peak_disconnect_time); | |
590 | |
591 EventCleanCodeCache event(UNTIMED); | |
592 if (event.should_commit()) { | |
593 event.set_starttime(disconnect_start_counter); | |
594 event.set_endtime(disconnect_end_counter); | |
595 event.set_disconnectedCount(disconnected); | |
596 event.set_madeNonEntrantCount(made_not_entrant); | |
597 event.commit(); | |
598 } | |
599 _number_of_flushes++; | |
600 | |
1202 | 601 // After two more traversals the sweeper will get rid of unrestored nmethods |
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602 _last_flush_traversal_id = _traversals; |
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603 _resweep = true; |
1202 | 604 #ifdef ASSERT |
10405 | 605 |
1202 | 606 if(PrintMethodFlushing && Verbose) { |
10405 | 607 tty->print_cr("### sweeper: unload time: " INT64_FORMAT, (jlong)disconnect_time); |
1202 | 608 } |
609 #endif | |
610 } | |
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611 |
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612 |
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613 // Print out some state information about the current sweep and the |
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614 // state of the code cache if it's requested. |
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615 void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) { |
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616 if (PrintMethodFlushing) { |
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617 stringStream s; |
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618 // Dump code cache state into a buffer before locking the tty, |
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619 // because log_state() will use locks causing lock conflicts. |
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620 CodeCache::log_state(&s); |
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621 |
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622 ttyLocker ttyl; |
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623 tty->print("### sweeper: %s ", msg); |
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624 if (format != NULL) { |
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625 va_list ap; |
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626 va_start(ap, format); |
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627 tty->vprint(format, ap); |
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628 va_end(ap); |
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629 } |
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630 tty->print_cr(s.as_string()); |
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631 } |
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632 |
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633 if (LogCompilation && (xtty != NULL)) { |
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634 stringStream s; |
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635 // Dump code cache state into a buffer before locking the tty, |
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636 // because log_state() will use locks causing lock conflicts. |
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637 CodeCache::log_state(&s); |
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638 |
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639 ttyLocker ttyl; |
1646 | 640 xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count()); |
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641 if (format != NULL) { |
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642 va_list ap; |
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643 va_start(ap, format); |
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644 xtty->vprint(format, ap); |
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645 va_end(ap); |
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646 } |
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647 xtty->print(s.as_string()); |
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648 xtty->stamp(); |
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649 xtty->end_elem(); |
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650 } |
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651 } |