Mercurial > hg > truffle
annotate src/share/vm/services/lowMemoryDetector.cpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | da91efe96a93 |
children | 203f64878aab |
rev | line source |
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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 * | |
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 "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 |