Mercurial > hg > truffle
annotate src/share/vm/services/lowMemoryDetector.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | bf8517f4e4d0 |
| children | 203f64878aab |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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 "classfile/systemDictionary.hpp" | |
| 27 #include "classfile/vmSymbols.hpp" | |
| 28 #include "oops/oop.inline.hpp" | |
| 29 #include "runtime/interfaceSupport.hpp" | |
| 30 #include "runtime/java.hpp" | |
| 31 #include "runtime/javaCalls.hpp" | |
| 32 #include "runtime/mutex.hpp" | |
| 33 #include "runtime/mutexLocker.hpp" | |
| 34 #include "services/lowMemoryDetector.hpp" | |
| 35 #include "services/management.hpp" | |
| 0 | 36 |
| 37 volatile bool LowMemoryDetector::_enabled_for_collected_pools = false; | |
| 38 volatile jint LowMemoryDetector::_disabled_count = 0; | |
| 39 | |
| 40 bool LowMemoryDetector::has_pending_requests() { | |
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41 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
| 0 | 42 bool has_requests = false; |
| 43 int num_memory_pools = MemoryService::num_memory_pools(); | |
| 44 for (int i = 0; i < num_memory_pools; i++) { | |
| 45 MemoryPool* pool = MemoryService::get_memory_pool(i); | |
| 46 SensorInfo* sensor = pool->usage_sensor(); | |
| 47 if (sensor != NULL) { | |
| 48 has_requests = has_requests || sensor->has_pending_requests(); | |
| 49 } | |
| 50 | |
| 51 SensorInfo* gc_sensor = pool->gc_usage_sensor(); | |
| 52 if (gc_sensor != NULL) { | |
| 53 has_requests = has_requests || gc_sensor->has_pending_requests(); | |
| 54 } | |
| 55 } | |
| 56 return has_requests; | |
| 57 } | |
| 58 | |
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59 void LowMemoryDetector::process_sensor_changes(TRAPS) { |
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60 ResourceMark rm(THREAD); |
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61 HandleMark hm(THREAD); |
| 0 | 62 |
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63 // No need to hold Service_lock to call out to Java |
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64 int num_memory_pools = MemoryService::num_memory_pools(); |
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65 for (int i = 0; i < num_memory_pools; i++) { |
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66 MemoryPool* pool = MemoryService::get_memory_pool(i); |
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67 SensorInfo* sensor = pool->usage_sensor(); |
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68 SensorInfo* gc_sensor = pool->gc_usage_sensor(); |
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69 if (sensor != NULL && sensor->has_pending_requests()) { |
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70 sensor->process_pending_requests(CHECK); |
| 0 | 71 } |
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72 if (gc_sensor != NULL && gc_sensor->has_pending_requests()) { |
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73 gc_sensor->process_pending_requests(CHECK); |
| 0 | 74 } |
| 75 } | |
| 76 } | |
| 77 | |
| 78 // This method could be called from any Java threads | |
| 79 // and also VMThread. | |
| 80 void LowMemoryDetector::detect_low_memory() { | |
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81 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
| 0 | 82 |
| 83 bool has_pending_requests = false; | |
| 84 int num_memory_pools = MemoryService::num_memory_pools(); | |
| 85 for (int i = 0; i < num_memory_pools; i++) { | |
| 86 MemoryPool* pool = MemoryService::get_memory_pool(i); | |
| 87 SensorInfo* sensor = pool->usage_sensor(); | |
| 88 if (sensor != NULL && | |
| 89 pool->usage_threshold()->is_high_threshold_supported() && | |
| 90 pool->usage_threshold()->high_threshold() != 0) { | |
| 91 MemoryUsage usage = pool->get_memory_usage(); | |
| 92 sensor->set_gauge_sensor_level(usage, | |
| 93 pool->usage_threshold()); | |
| 94 has_pending_requests = has_pending_requests || sensor->has_pending_requests(); | |
| 95 } | |
| 96 } | |
| 97 | |
| 98 if (has_pending_requests) { | |
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99 Service_lock->notify_all(); |
| 0 | 100 } |
| 101 } | |
| 102 | |
| 103 // This method could be called from any Java threads | |
| 104 // and also VMThread. | |
| 105 void LowMemoryDetector::detect_low_memory(MemoryPool* pool) { | |
| 106 SensorInfo* sensor = pool->usage_sensor(); | |
| 107 if (sensor == NULL || | |
| 108 !pool->usage_threshold()->is_high_threshold_supported() || | |
| 109 pool->usage_threshold()->high_threshold() == 0) { | |
| 110 return; | |
| 111 } | |
| 112 | |
| 113 { | |
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114 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
| 0 | 115 |
| 116 MemoryUsage usage = pool->get_memory_usage(); | |
| 117 sensor->set_gauge_sensor_level(usage, | |
| 118 pool->usage_threshold()); | |
| 119 if (sensor->has_pending_requests()) { | |
| 120 // notify sensor state update | |
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121 Service_lock->notify_all(); |
| 0 | 122 } |
| 123 } | |
| 124 } | |
| 125 | |
| 126 // Only called by VMThread at GC time | |
| 127 void LowMemoryDetector::detect_after_gc_memory(MemoryPool* pool) { | |
| 128 SensorInfo* sensor = pool->gc_usage_sensor(); | |
| 129 if (sensor == NULL || | |
| 130 !pool->gc_usage_threshold()->is_high_threshold_supported() || | |
| 131 pool->gc_usage_threshold()->high_threshold() == 0) { | |
| 132 return; | |
| 133 } | |
| 134 | |
| 135 { | |
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136 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
| 0 | 137 |
| 138 MemoryUsage usage = pool->get_last_collection_usage(); | |
| 139 sensor->set_counter_sensor_level(usage, pool->gc_usage_threshold()); | |
| 140 | |
| 141 if (sensor->has_pending_requests()) { | |
| 142 // notify sensor state update | |
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143 Service_lock->notify_all(); |
| 0 | 144 } |
| 145 } | |
| 146 } | |
| 147 | |
| 148 // recompute enabled flag | |
| 149 void LowMemoryDetector::recompute_enabled_for_collected_pools() { | |
| 150 bool enabled = false; | |
| 151 int num_memory_pools = MemoryService::num_memory_pools(); | |
| 152 for (int i=0; i<num_memory_pools; i++) { | |
| 153 MemoryPool* pool = MemoryService::get_memory_pool(i); | |
| 154 if (pool->is_collected_pool() && is_enabled(pool)) { | |
| 155 enabled = true; | |
| 156 break; | |
| 157 } | |
| 158 } | |
| 159 _enabled_for_collected_pools = enabled; | |
| 160 } | |
| 161 | |
| 162 SensorInfo::SensorInfo() { | |
| 163 _sensor_obj = NULL; | |
| 164 _sensor_on = false; | |
| 165 _sensor_count = 0; | |
| 166 _pending_trigger_count = 0; | |
| 167 _pending_clear_count = 0; | |
| 168 } | |
| 169 | |
| 170 // When this method is used, the memory usage is monitored | |
| 171 // as a gauge attribute. Sensor notifications (trigger or | |
| 172 // clear) is only emitted at the first time it crosses | |
| 173 // a threshold. | |
| 174 // | |
| 175 // High and low thresholds are designed to provide a | |
| 176 // hysteresis mechanism to avoid repeated triggering | |
| 177 // of notifications when the attribute value makes small oscillations | |
| 178 // around the high or low threshold value. | |
| 179 // | |
| 180 // The sensor will be triggered if: | |
| 181 // (1) the usage is crossing above the high threshold and | |
| 182 // the sensor is currently off and no pending | |
| 183 // trigger requests; or | |
| 184 // (2) the usage is crossing above the high threshold and | |
| 185 // the sensor will be off (i.e. sensor is currently on | |
| 186 // and has pending clear requests). | |
| 187 // | |
| 188 // Subsequent crossings of the high threshold value do not cause | |
| 189 // any triggers unless the usage becomes less than the low threshold. | |
| 190 // | |
| 191 // The sensor will be cleared if: | |
| 192 // (1) the usage is crossing below the low threshold and | |
| 193 // the sensor is currently on and no pending | |
| 194 // clear requests; or | |
| 195 // (2) the usage is crossing below the low threshold and | |
| 196 // the sensor will be on (i.e. sensor is currently off | |
| 197 // and has pending trigger requests). | |
| 198 // | |
| 199 // Subsequent crossings of the low threshold value do not cause | |
| 200 // any clears unless the usage becomes greater than or equal | |
| 201 // to the high threshold. | |
| 202 // | |
| 203 // If the current level is between high and low threhsold, no change. | |
| 204 // | |
| 205 void SensorInfo::set_gauge_sensor_level(MemoryUsage usage, ThresholdSupport* high_low_threshold) { | |
| 206 assert(high_low_threshold->is_high_threshold_supported(), "just checking"); | |
| 207 | |
| 208 bool is_over_high = high_low_threshold->is_high_threshold_crossed(usage); | |
| 209 bool is_below_low = high_low_threshold->is_low_threshold_crossed(usage); | |
| 210 | |
| 211 assert(!(is_over_high && is_below_low), "Can't be both true"); | |
| 212 | |
| 213 if (is_over_high && | |
| 214 ((!_sensor_on && _pending_trigger_count == 0) || | |
| 215 _pending_clear_count > 0)) { | |
| 216 // low memory detected and need to increment the trigger pending count | |
| 217 // if the sensor is off or will be off due to _pending_clear_ > 0 | |
| 218 // Request to trigger the sensor | |
| 219 _pending_trigger_count++; | |
| 220 _usage = usage; | |
| 221 | |
| 222 if (_pending_clear_count > 0) { | |
| 223 // non-zero pending clear requests indicates that there are | |
| 224 // pending requests to clear this sensor. | |
| 225 // This trigger request needs to clear this clear count | |
| 226 // since the resulting sensor flag should be on. | |
| 227 _pending_clear_count = 0; | |
| 228 } | |
| 229 } else if (is_below_low && | |
| 230 ((_sensor_on && _pending_clear_count == 0) || | |
| 231 (_pending_trigger_count > 0 && _pending_clear_count == 0))) { | |
| 232 // memory usage returns below the threshold | |
| 233 // Request to clear the sensor if the sensor is on or will be on due to | |
| 234 // _pending_trigger_count > 0 and also no clear request | |
| 235 _pending_clear_count++; | |
| 236 } | |
| 237 } | |
| 238 | |
| 239 // When this method is used, the memory usage is monitored as a | |
| 240 // simple counter attribute. The sensor will be triggered | |
| 241 // whenever the usage is crossing the threshold to keep track | |
| 242 // of the number of times the VM detects such a condition occurs. | |
| 243 // | |
| 244 // High and low thresholds are designed to provide a | |
| 245 // hysteresis mechanism to avoid repeated triggering | |
| 246 // of notifications when the attribute value makes small oscillations | |
| 247 // around the high or low threshold value. | |
| 248 // | |
| 249 // The sensor will be triggered if: | |
| 250 // - the usage is crossing above the high threshold regardless | |
| 251 // of the current sensor state. | |
| 252 // | |
| 253 // The sensor will be cleared if: | |
| 254 // (1) the usage is crossing below the low threshold and | |
| 255 // the sensor is currently on; or | |
| 256 // (2) the usage is crossing below the low threshold and | |
| 257 // the sensor will be on (i.e. sensor is currently off | |
| 258 // and has pending trigger requests). | |
| 259 void SensorInfo::set_counter_sensor_level(MemoryUsage usage, ThresholdSupport* counter_threshold) { | |
| 260 assert(counter_threshold->is_high_threshold_supported(), "just checking"); | |
| 261 | |
| 262 bool is_over_high = counter_threshold->is_high_threshold_crossed(usage); | |
| 263 bool is_below_low = counter_threshold->is_low_threshold_crossed(usage); | |
| 264 | |
| 265 assert(!(is_over_high && is_below_low), "Can't be both true"); | |
| 266 | |
| 267 if (is_over_high) { | |
| 268 _pending_trigger_count++; | |
| 269 _usage = usage; | |
| 270 _pending_clear_count = 0; | |
| 271 } else if (is_below_low && (_sensor_on || _pending_trigger_count > 0)) { | |
| 272 _pending_clear_count++; | |
| 273 } | |
| 274 } | |
| 275 | |
| 276 void SensorInfo::oops_do(OopClosure* f) { | |
| 277 f->do_oop((oop*) &_sensor_obj); | |
| 278 } | |
| 279 | |
| 280 void SensorInfo::process_pending_requests(TRAPS) { | |
| 281 if (!has_pending_requests()) { | |
| 282 return; | |
| 283 } | |
| 284 | |
| 285 int pending_count = pending_trigger_count(); | |
| 286 if (pending_clear_count() > 0) { | |
| 287 clear(pending_count, CHECK); | |
| 288 } else { | |
| 289 trigger(pending_count, CHECK); | |
| 290 } | |
| 291 | |
| 292 } | |
| 293 | |
| 294 void SensorInfo::trigger(int count, TRAPS) { | |
| 295 assert(count <= _pending_trigger_count, "just checking"); | |
| 296 | |
| 297 if (_sensor_obj != NULL) { | |
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298 Klass* k = Management::sun_management_Sensor_klass(CHECK); |
| 0 | 299 instanceKlassHandle sensorKlass (THREAD, k); |
| 300 Handle sensor_h(THREAD, _sensor_obj); | |
| 301 Handle usage_h = MemoryService::create_MemoryUsage_obj(_usage, CHECK); | |
| 302 | |
| 303 JavaValue result(T_VOID); | |
| 304 JavaCallArguments args(sensor_h); | |
| 305 args.push_int((int) count); | |
| 306 args.push_oop(usage_h); | |
| 307 | |
| 308 JavaCalls::call_virtual(&result, | |
| 309 sensorKlass, | |
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310 vmSymbols::trigger_name(), |
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311 vmSymbols::trigger_method_signature(), |
| 0 | 312 &args, |
| 313 CHECK); | |
| 314 } | |
| 315 | |
| 316 { | |
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317 // Holds Service_lock and update the sensor state |
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318 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
| 0 | 319 _sensor_on = true; |
| 320 _sensor_count += count; | |
| 321 _pending_trigger_count = _pending_trigger_count - count; | |
| 322 } | |
| 323 } | |
| 324 | |
| 325 void SensorInfo::clear(int count, TRAPS) { | |
| 326 if (_sensor_obj != NULL) { | |
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327 Klass* k = Management::sun_management_Sensor_klass(CHECK); |
| 0 | 328 instanceKlassHandle sensorKlass (THREAD, k); |
| 329 Handle sensor(THREAD, _sensor_obj); | |
| 330 | |
| 331 JavaValue result(T_VOID); | |
| 332 JavaCallArguments args(sensor); | |
| 333 args.push_int((int) count); | |
| 334 JavaCalls::call_virtual(&result, | |
| 335 sensorKlass, | |
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336 vmSymbols::clear_name(), |
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337 vmSymbols::int_void_signature(), |
| 0 | 338 &args, |
| 339 CHECK); | |
| 340 } | |
| 341 | |
| 342 { | |
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343 // Holds Service_lock and update the sensor state |
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344 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
| 0 | 345 _sensor_on = false; |
| 346 _pending_clear_count = 0; | |
| 347 _pending_trigger_count = _pending_trigger_count - count; | |
| 348 } | |
| 349 } | |
| 350 | |
| 351 //-------------------------------------------------------------- | |
| 352 // Non-product code | |
| 353 | |
| 354 #ifndef PRODUCT | |
| 355 void SensorInfo::print() { | |
| 356 tty->print_cr("%s count = %ld pending_triggers = %ld pending_clears = %ld", | |
| 357 (_sensor_on ? "on" : "off"), | |
| 358 _sensor_count, _pending_trigger_count, _pending_clear_count); | |
| 359 } | |
| 360 | |
| 361 #endif // PRODUCT |