Mercurial > hg > truffle
annotate src/share/vm/services/lowMemoryDetector.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 2010, 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
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1142
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1142
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1142
diff
changeset
|
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 LowMemoryDetectorThread* LowMemoryDetector::_detector_thread = NULL; | |
| 38 volatile bool LowMemoryDetector::_enabled_for_collected_pools = false; | |
| 39 volatile jint LowMemoryDetector::_disabled_count = 0; | |
| 40 | |
| 41 void LowMemoryDetector::initialize() { | |
| 42 EXCEPTION_MARK; | |
| 43 | |
| 1142 | 44 instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass()); |
| 0 | 45 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); |
| 46 | |
| 47 const char thread_name[] = "Low Memory Detector"; | |
| 48 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
| 49 | |
| 50 // Initialize thread_oop to put it into the system threadGroup | |
| 51 Handle thread_group (THREAD, Universe::system_thread_group()); | |
| 52 JavaValue result(T_VOID); | |
| 53 JavaCalls::call_special(&result, thread_oop, | |
| 54 klass, | |
| 55 vmSymbolHandles::object_initializer_name(), | |
| 56 vmSymbolHandles::threadgroup_string_void_signature(), | |
| 57 thread_group, | |
| 58 string, | |
| 59 CHECK); | |
| 60 | |
| 61 { | |
| 62 MutexLocker mu(Threads_lock); | |
| 63 _detector_thread = new LowMemoryDetectorThread(&low_memory_detector_thread_entry); | |
| 64 | |
| 65 // At this point it may be possible that no osthread was created for the | |
| 66 // JavaThread due to lack of memory. We would have to throw an exception | |
| 67 // in that case. However, since this must work and we do not allow | |
| 68 // exceptions anyway, check and abort if this fails. | |
| 69 if (_detector_thread == NULL || _detector_thread->osthread() == NULL) { | |
| 70 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
| 71 "unable to create new native thread"); | |
| 72 } | |
| 73 | |
| 74 java_lang_Thread::set_thread(thread_oop(), _detector_thread); | |
| 75 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
| 76 java_lang_Thread::set_daemon(thread_oop()); | |
| 77 _detector_thread->set_threadObj(thread_oop()); | |
| 78 | |
| 79 Threads::add(_detector_thread); | |
| 80 Thread::start(_detector_thread); | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 bool LowMemoryDetector::has_pending_requests() { | |
| 85 assert(LowMemory_lock->owned_by_self(), "Must own LowMemory_lock"); | |
| 86 bool has_requests = false; | |
| 87 int num_memory_pools = MemoryService::num_memory_pools(); | |
| 88 for (int i = 0; i < num_memory_pools; i++) { | |
| 89 MemoryPool* pool = MemoryService::get_memory_pool(i); | |
| 90 SensorInfo* sensor = pool->usage_sensor(); | |
| 91 if (sensor != NULL) { | |
| 92 has_requests = has_requests || sensor->has_pending_requests(); | |
| 93 } | |
| 94 | |
| 95 SensorInfo* gc_sensor = pool->gc_usage_sensor(); | |
| 96 if (gc_sensor != NULL) { | |
| 97 has_requests = has_requests || gc_sensor->has_pending_requests(); | |
| 98 } | |
| 99 } | |
| 100 return has_requests; | |
| 101 } | |
| 102 | |
| 103 void LowMemoryDetector::low_memory_detector_thread_entry(JavaThread* jt, TRAPS) { | |
| 104 while (true) { | |
| 105 bool sensors_changed = false; | |
| 106 | |
| 107 { | |
| 108 // _no_safepoint_check_flag is used here as LowMemory_lock is a | |
| 109 // special lock and the VMThread may acquire this lock at safepoint. | |
| 110 // Need state transition ThreadBlockInVM so that this thread | |
| 111 // will be handled by safepoint correctly when this thread is | |
| 112 // notified at a safepoint. | |
| 113 | |
| 114 // This ThreadBlockInVM object is not also considered to be | |
| 115 // suspend-equivalent because LowMemoryDetector threads are | |
| 116 // not visible to external suspension. | |
| 117 | |
| 118 ThreadBlockInVM tbivm(jt); | |
| 119 | |
| 120 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); | |
| 121 while (!(sensors_changed = has_pending_requests())) { | |
| 122 // wait until one of the sensors has pending requests | |
| 123 LowMemory_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 { | |
| 128 ResourceMark rm(THREAD); | |
| 129 HandleMark hm(THREAD); | |
| 130 | |
| 131 // No need to hold LowMemory_lock to call out to Java | |
| 132 int num_memory_pools = MemoryService::num_memory_pools(); | |
| 133 for (int i = 0; i < num_memory_pools; i++) { | |
| 134 MemoryPool* pool = MemoryService::get_memory_pool(i); | |
| 135 SensorInfo* sensor = pool->usage_sensor(); | |
| 136 SensorInfo* gc_sensor = pool->gc_usage_sensor(); | |
| 137 if (sensor != NULL && sensor->has_pending_requests()) { | |
| 138 sensor->process_pending_requests(CHECK); | |
| 139 } | |
| 140 if (gc_sensor != NULL && gc_sensor->has_pending_requests()) { | |
| 141 gc_sensor->process_pending_requests(CHECK); | |
| 142 } | |
| 143 } | |
| 144 } | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 // This method could be called from any Java threads | |
| 149 // and also VMThread. | |
| 150 void LowMemoryDetector::detect_low_memory() { | |
| 151 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); | |
| 152 | |
| 153 bool has_pending_requests = false; | |
| 154 int num_memory_pools = MemoryService::num_memory_pools(); | |
| 155 for (int i = 0; i < num_memory_pools; i++) { | |
| 156 MemoryPool* pool = MemoryService::get_memory_pool(i); | |
| 157 SensorInfo* sensor = pool->usage_sensor(); | |
| 158 if (sensor != NULL && | |
| 159 pool->usage_threshold()->is_high_threshold_supported() && | |
| 160 pool->usage_threshold()->high_threshold() != 0) { | |
| 161 MemoryUsage usage = pool->get_memory_usage(); | |
| 162 sensor->set_gauge_sensor_level(usage, | |
| 163 pool->usage_threshold()); | |
| 164 has_pending_requests = has_pending_requests || sensor->has_pending_requests(); | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 if (has_pending_requests) { | |
| 169 LowMemory_lock->notify_all(); | |
| 170 } | |
| 171 } | |
| 172 | |
| 173 // This method could be called from any Java threads | |
| 174 // and also VMThread. | |
| 175 void LowMemoryDetector::detect_low_memory(MemoryPool* pool) { | |
| 176 SensorInfo* sensor = pool->usage_sensor(); | |
| 177 if (sensor == NULL || | |
| 178 !pool->usage_threshold()->is_high_threshold_supported() || | |
| 179 pool->usage_threshold()->high_threshold() == 0) { | |
| 180 return; | |
| 181 } | |
| 182 | |
| 183 { | |
| 184 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); | |
| 185 | |
| 186 MemoryUsage usage = pool->get_memory_usage(); | |
| 187 sensor->set_gauge_sensor_level(usage, | |
| 188 pool->usage_threshold()); | |
| 189 if (sensor->has_pending_requests()) { | |
| 190 // notify sensor state update | |
| 191 LowMemory_lock->notify_all(); | |
| 192 } | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 // Only called by VMThread at GC time | |
| 197 void LowMemoryDetector::detect_after_gc_memory(MemoryPool* pool) { | |
| 198 SensorInfo* sensor = pool->gc_usage_sensor(); | |
| 199 if (sensor == NULL || | |
| 200 !pool->gc_usage_threshold()->is_high_threshold_supported() || | |
| 201 pool->gc_usage_threshold()->high_threshold() == 0) { | |
| 202 return; | |
| 203 } | |
| 204 | |
| 205 { | |
| 206 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); | |
| 207 | |
| 208 MemoryUsage usage = pool->get_last_collection_usage(); | |
| 209 sensor->set_counter_sensor_level(usage, pool->gc_usage_threshold()); | |
| 210 | |
| 211 if (sensor->has_pending_requests()) { | |
| 212 // notify sensor state update | |
| 213 LowMemory_lock->notify_all(); | |
| 214 } | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 // recompute enabled flag | |
| 219 void LowMemoryDetector::recompute_enabled_for_collected_pools() { | |
| 220 bool enabled = false; | |
| 221 int num_memory_pools = MemoryService::num_memory_pools(); | |
| 222 for (int i=0; i<num_memory_pools; i++) { | |
| 223 MemoryPool* pool = MemoryService::get_memory_pool(i); | |
| 224 if (pool->is_collected_pool() && is_enabled(pool)) { | |
| 225 enabled = true; | |
| 226 break; | |
| 227 } | |
| 228 } | |
| 229 _enabled_for_collected_pools = enabled; | |
| 230 } | |
| 231 | |
| 232 SensorInfo::SensorInfo() { | |
| 233 _sensor_obj = NULL; | |
| 234 _sensor_on = false; | |
| 235 _sensor_count = 0; | |
| 236 _pending_trigger_count = 0; | |
| 237 _pending_clear_count = 0; | |
| 238 } | |
| 239 | |
| 240 // When this method is used, the memory usage is monitored | |
| 241 // as a gauge attribute. Sensor notifications (trigger or | |
| 242 // clear) is only emitted at the first time it crosses | |
| 243 // a threshold. | |
| 244 // | |
| 245 // High and low thresholds are designed to provide a | |
| 246 // hysteresis mechanism to avoid repeated triggering | |
| 247 // of notifications when the attribute value makes small oscillations | |
| 248 // around the high or low threshold value. | |
| 249 // | |
| 250 // The sensor will be triggered if: | |
| 251 // (1) the usage is crossing above the high threshold and | |
| 252 // the sensor is currently off and no pending | |
| 253 // trigger requests; or | |
| 254 // (2) the usage is crossing above the high threshold and | |
| 255 // the sensor will be off (i.e. sensor is currently on | |
| 256 // and has pending clear requests). | |
| 257 // | |
| 258 // Subsequent crossings of the high threshold value do not cause | |
| 259 // any triggers unless the usage becomes less than the low threshold. | |
| 260 // | |
| 261 // The sensor will be cleared if: | |
| 262 // (1) the usage is crossing below the low threshold and | |
| 263 // the sensor is currently on and no pending | |
| 264 // clear requests; or | |
| 265 // (2) the usage is crossing below the low threshold and | |
| 266 // the sensor will be on (i.e. sensor is currently off | |
| 267 // and has pending trigger requests). | |
| 268 // | |
| 269 // Subsequent crossings of the low threshold value do not cause | |
| 270 // any clears unless the usage becomes greater than or equal | |
| 271 // to the high threshold. | |
| 272 // | |
| 273 // If the current level is between high and low threhsold, no change. | |
| 274 // | |
| 275 void SensorInfo::set_gauge_sensor_level(MemoryUsage usage, ThresholdSupport* high_low_threshold) { | |
| 276 assert(high_low_threshold->is_high_threshold_supported(), "just checking"); | |
| 277 | |
| 278 bool is_over_high = high_low_threshold->is_high_threshold_crossed(usage); | |
| 279 bool is_below_low = high_low_threshold->is_low_threshold_crossed(usage); | |
| 280 | |
| 281 assert(!(is_over_high && is_below_low), "Can't be both true"); | |
| 282 | |
| 283 if (is_over_high && | |
| 284 ((!_sensor_on && _pending_trigger_count == 0) || | |
| 285 _pending_clear_count > 0)) { | |
| 286 // low memory detected and need to increment the trigger pending count | |
| 287 // if the sensor is off or will be off due to _pending_clear_ > 0 | |
| 288 // Request to trigger the sensor | |
| 289 _pending_trigger_count++; | |
| 290 _usage = usage; | |
| 291 | |
| 292 if (_pending_clear_count > 0) { | |
| 293 // non-zero pending clear requests indicates that there are | |
| 294 // pending requests to clear this sensor. | |
| 295 // This trigger request needs to clear this clear count | |
| 296 // since the resulting sensor flag should be on. | |
| 297 _pending_clear_count = 0; | |
| 298 } | |
| 299 } else if (is_below_low && | |
| 300 ((_sensor_on && _pending_clear_count == 0) || | |
| 301 (_pending_trigger_count > 0 && _pending_clear_count == 0))) { | |
| 302 // memory usage returns below the threshold | |
| 303 // Request to clear the sensor if the sensor is on or will be on due to | |
| 304 // _pending_trigger_count > 0 and also no clear request | |
| 305 _pending_clear_count++; | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 // When this method is used, the memory usage is monitored as a | |
| 310 // simple counter attribute. The sensor will be triggered | |
| 311 // whenever the usage is crossing the threshold to keep track | |
| 312 // of the number of times the VM detects such a condition occurs. | |
| 313 // | |
| 314 // High and low thresholds are designed to provide a | |
| 315 // hysteresis mechanism to avoid repeated triggering | |
| 316 // of notifications when the attribute value makes small oscillations | |
| 317 // around the high or low threshold value. | |
| 318 // | |
| 319 // The sensor will be triggered if: | |
| 320 // - the usage is crossing above the high threshold regardless | |
| 321 // of the current sensor state. | |
| 322 // | |
| 323 // The sensor will be cleared if: | |
| 324 // (1) the usage is crossing below the low threshold and | |
| 325 // the sensor is currently on; or | |
| 326 // (2) the usage is crossing below the low threshold and | |
| 327 // the sensor will be on (i.e. sensor is currently off | |
| 328 // and has pending trigger requests). | |
| 329 void SensorInfo::set_counter_sensor_level(MemoryUsage usage, ThresholdSupport* counter_threshold) { | |
| 330 assert(counter_threshold->is_high_threshold_supported(), "just checking"); | |
| 331 | |
| 332 bool is_over_high = counter_threshold->is_high_threshold_crossed(usage); | |
| 333 bool is_below_low = counter_threshold->is_low_threshold_crossed(usage); | |
| 334 | |
| 335 assert(!(is_over_high && is_below_low), "Can't be both true"); | |
| 336 | |
| 337 if (is_over_high) { | |
| 338 _pending_trigger_count++; | |
| 339 _usage = usage; | |
| 340 _pending_clear_count = 0; | |
| 341 } else if (is_below_low && (_sensor_on || _pending_trigger_count > 0)) { | |
| 342 _pending_clear_count++; | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 void SensorInfo::oops_do(OopClosure* f) { | |
| 347 f->do_oop((oop*) &_sensor_obj); | |
| 348 } | |
| 349 | |
| 350 void SensorInfo::process_pending_requests(TRAPS) { | |
| 351 if (!has_pending_requests()) { | |
| 352 return; | |
| 353 } | |
| 354 | |
| 355 int pending_count = pending_trigger_count(); | |
| 356 if (pending_clear_count() > 0) { | |
| 357 clear(pending_count, CHECK); | |
| 358 } else { | |
| 359 trigger(pending_count, CHECK); | |
| 360 } | |
| 361 | |
| 362 } | |
| 363 | |
| 364 void SensorInfo::trigger(int count, TRAPS) { | |
| 365 assert(count <= _pending_trigger_count, "just checking"); | |
| 366 | |
| 367 if (_sensor_obj != NULL) { | |
| 368 klassOop k = Management::sun_management_Sensor_klass(CHECK); | |
| 369 instanceKlassHandle sensorKlass (THREAD, k); | |
| 370 Handle sensor_h(THREAD, _sensor_obj); | |
| 371 Handle usage_h = MemoryService::create_MemoryUsage_obj(_usage, CHECK); | |
| 372 | |
| 373 JavaValue result(T_VOID); | |
| 374 JavaCallArguments args(sensor_h); | |
| 375 args.push_int((int) count); | |
| 376 args.push_oop(usage_h); | |
| 377 | |
| 378 JavaCalls::call_virtual(&result, | |
| 379 sensorKlass, | |
| 380 vmSymbolHandles::trigger_name(), | |
| 381 vmSymbolHandles::trigger_method_signature(), | |
| 382 &args, | |
| 383 CHECK); | |
| 384 } | |
| 385 | |
| 386 { | |
| 387 // Holds LowMemory_lock and update the sensor state | |
| 388 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); | |
| 389 _sensor_on = true; | |
| 390 _sensor_count += count; | |
| 391 _pending_trigger_count = _pending_trigger_count - count; | |
| 392 } | |
| 393 } | |
| 394 | |
| 395 void SensorInfo::clear(int count, TRAPS) { | |
| 396 if (_sensor_obj != NULL) { | |
| 397 klassOop k = Management::sun_management_Sensor_klass(CHECK); | |
| 398 instanceKlassHandle sensorKlass (THREAD, k); | |
| 399 Handle sensor(THREAD, _sensor_obj); | |
| 400 | |
| 401 JavaValue result(T_VOID); | |
| 402 JavaCallArguments args(sensor); | |
| 403 args.push_int((int) count); | |
| 404 JavaCalls::call_virtual(&result, | |
| 405 sensorKlass, | |
| 406 vmSymbolHandles::clear_name(), | |
| 407 vmSymbolHandles::int_void_signature(), | |
| 408 &args, | |
| 409 CHECK); | |
| 410 } | |
| 411 | |
| 412 { | |
| 413 // Holds LowMemory_lock and update the sensor state | |
| 414 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); | |
| 415 _sensor_on = false; | |
| 416 _pending_clear_count = 0; | |
| 417 _pending_trigger_count = _pending_trigger_count - count; | |
| 418 } | |
| 419 } | |
| 420 | |
| 421 //-------------------------------------------------------------- | |
| 422 // Non-product code | |
| 423 | |
| 424 #ifndef PRODUCT | |
| 425 void SensorInfo::print() { | |
| 426 tty->print_cr("%s count = %ld pending_triggers = %ld pending_clears = %ld", | |
| 427 (_sensor_on ? "on" : "off"), | |
| 428 _sensor_count, _pending_trigger_count, _pending_clear_count); | |
| 429 } | |
| 430 | |
| 431 #endif // PRODUCT |