Mercurial > hg > truffle
annotate src/share/vm/runtime/statSampler.cpp @ 616:4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
6720334: G1: don't update RSets of collection set regions during an evacuation pause
Summary: Introduced a deferred update mechanism for delaying the rset updates during the collection pause
Reviewed-by: apetrusenko, tonyp
author | iveresov |
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date | Fri, 06 Mar 2009 13:50:14 -0800 |
parents | 9ee9cf798b59 |
children | 4ce7240d622c |
rev | line source |
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0 | 1 /* |
337 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_statSampler.cpp.incl" | |
27 | |
28 // -------------------------------------------------------- | |
29 // StatSamplerTask | |
30 | |
31 class StatSamplerTask : public PeriodicTask { | |
32 public: | |
33 StatSamplerTask(int interval_time) : PeriodicTask(interval_time) {} | |
34 void task() { StatSampler::collect_sample(); } | |
35 }; | |
36 | |
37 | |
38 //---------------------------------------------------------- | |
39 // Implementation of StatSampler | |
40 | |
41 StatSamplerTask* StatSampler::_task = NULL; | |
42 PerfDataList* StatSampler::_sampled = NULL; | |
43 | |
44 /* | |
45 * the initialize method is called from the engage() method | |
46 * and is responsible for initializing various global variables. | |
47 */ | |
48 void StatSampler::initialize() { | |
49 | |
50 if (!UsePerfData) return; | |
51 | |
52 // create performance data that could not be created prior | |
53 // to vm_init_globals() or otherwise have no logical home. | |
54 | |
55 create_misc_perfdata(); | |
56 | |
57 // get copy of the sampled list | |
58 _sampled = PerfDataManager::sampled(); | |
59 | |
60 } | |
61 | |
62 /* | |
63 * The engage() method is called at initialization time via | |
64 * Thread::create_vm() to initialize the StatSampler and | |
65 * register it with the WatcherThread as a periodic task. | |
66 */ | |
67 void StatSampler::engage() { | |
68 | |
69 if (!UsePerfData) return; | |
70 | |
71 if (!is_active()) { | |
72 | |
73 initialize(); | |
74 | |
75 // start up the periodic task | |
76 _task = new StatSamplerTask(PerfDataSamplingInterval); | |
77 _task->enroll(); | |
78 } | |
79 } | |
80 | |
81 | |
82 /* | |
83 * the disengage() method is responsible for deactivating the periodic | |
84 * task and, if logging was enabled, for logging the final sample. This | |
85 * method is called from before_exit() in java.cpp and is only called | |
86 * after the WatcherThread has been stopped. | |
87 */ | |
88 void StatSampler::disengage() { | |
89 | |
90 if (!UsePerfData) return; | |
91 | |
92 if (!is_active()) | |
93 return; | |
94 | |
95 // remove StatSamplerTask | |
96 _task->disenroll(); | |
97 delete _task; | |
98 _task = NULL; | |
99 | |
100 // force a final sample | |
101 sample_data(_sampled); | |
102 } | |
103 | |
104 /* | |
105 * the destroy method is responsible for releasing any resources used by | |
106 * the StatSampler prior to shutdown of the VM. this method is called from | |
107 * before_exit() in java.cpp and is only called after the WatcherThread | |
108 * has stopped. | |
109 */ | |
110 void StatSampler::destroy() { | |
111 | |
112 if (!UsePerfData) return; | |
113 | |
114 if (_sampled != NULL) { | |
115 delete(_sampled); | |
116 _sampled = NULL; | |
117 } | |
118 } | |
119 | |
120 /* | |
121 * The sample_data() method is responsible for sampling the | |
122 * the data value for each PerfData instance in the given list. | |
123 */ | |
124 void StatSampler::sample_data(PerfDataList* list) { | |
125 | |
126 assert(list != NULL, "null list unexpected"); | |
127 | |
128 for (int index = 0; index < list->length(); index++) { | |
129 PerfData* item = list->at(index); | |
130 item->sample(); | |
131 } | |
132 } | |
133 | |
134 /* | |
135 * the collect_sample() method is the method invoked by the | |
136 * WatcherThread via the PeriodicTask::task() method. This method | |
137 * is responsible for collecting data samples from sampled | |
138 * PerfData instances every PerfDataSamplingInterval milliseconds. | |
139 * It is also responsible for logging the requested set of | |
140 * PerfData instances every _sample_count milliseconds. While | |
141 * logging data, it will output a column header after every _print_header | |
142 * rows of data have been logged. | |
143 */ | |
144 void StatSampler::collect_sample() { | |
145 | |
146 // future - check for new PerfData objects. PerfData objects might | |
147 // get added to the PerfDataManager lists after we have already | |
148 // built our local copies. | |
149 // | |
150 // if (PerfDataManager::count() > previous) { | |
151 // // get a new copy of the sampled list | |
152 // if (_sampled != NULL) { | |
153 // delete(_sampled); | |
154 // _sampled = NULL; | |
155 // } | |
156 // _sampled = PerfDataManager::sampled(); | |
157 // } | |
158 | |
159 assert(_sampled != NULL, "list not initialized"); | |
160 | |
161 sample_data(_sampled); | |
162 } | |
163 | |
164 /* | |
165 * method to upcall into Java to return the value of the specified | |
166 * property as a utf8 string, or NULL if does not exist. The caller | |
167 * is responsible for setting a ResourceMark for proper cleanup of | |
168 * the utf8 strings. | |
169 */ | |
170 const char* StatSampler::get_system_property(const char* name, TRAPS) { | |
171 | |
172 // setup the arguments to getProperty | |
173 Handle key_str = java_lang_String::create_from_str(name, CHECK_NULL); | |
174 | |
175 // return value | |
176 JavaValue result(T_OBJECT); | |
177 | |
178 // public static String getProperty(String key, String def); | |
179 JavaCalls::call_static(&result, | |
180 KlassHandle(THREAD, SystemDictionary::system_klass()), | |
181 vmSymbolHandles::getProperty_name(), | |
182 vmSymbolHandles::string_string_signature(), | |
183 key_str, | |
184 CHECK_NULL); | |
185 | |
186 oop value_oop = (oop)result.get_jobject(); | |
187 if (value_oop == NULL) { | |
188 return NULL; | |
189 } | |
190 | |
191 // convert Java String to utf8 string | |
192 char* value = java_lang_String::as_utf8_string(value_oop); | |
193 | |
194 return value; | |
195 } | |
196 | |
197 /* | |
198 * The list of System Properties that have corresponding PerfData | |
199 * string instrumentation created by retrieving the named property's | |
200 * value from System.getProperty() and unconditionally creating a | |
201 * PerfStringConstant object initialized to the retreived value. This | |
202 * is not an exhustive list of Java properties with corresponding string | |
203 * instrumentation as the create_system_property_instrumentation() method | |
204 * creates other property based instrumentation conditionally. | |
205 */ | |
206 | |
207 // stable interface, supported counters | |
208 static const char* property_counters_ss[] = { | |
209 "java.vm.specification.version", | |
210 "java.vm.specification.name", | |
211 "java.vm.specification.vendor", | |
212 "java.vm.version", | |
213 "java.vm.name", | |
214 "java.vm.vendor", | |
215 "java.vm.info", | |
216 "java.library.path", | |
217 "java.class.path", | |
218 "java.endorsed.dirs", | |
219 "java.ext.dirs", | |
279
f3a650d8df24
6625846: Export system property java.version via jvmstat
thurka
parents:
0
diff
changeset
|
220 "java.version", |
0 | 221 "java.home", |
222 NULL | |
223 }; | |
224 | |
225 // unstable interface, supported counters | |
226 static const char* property_counters_us[] = { | |
227 NULL | |
228 }; | |
229 | |
230 // unstable interface, unsupported counters | |
231 static const char* property_counters_uu[] = { | |
232 "sun.boot.class.path", | |
233 "sun.boot.library.path", | |
234 NULL | |
235 }; | |
236 | |
237 typedef struct { | |
238 const char** property_list; | |
239 CounterNS name_space; | |
240 } PropertyCounters; | |
241 | |
242 static PropertyCounters property_counters[] = { | |
243 { property_counters_ss, JAVA_PROPERTY }, | |
244 { property_counters_us, COM_PROPERTY }, | |
245 { property_counters_uu, SUN_PROPERTY }, | |
246 { NULL, SUN_PROPERTY } | |
247 }; | |
248 | |
249 | |
250 /* | |
251 * Method to create PerfData string instruments that contain the values | |
252 * of various system properties. String instruments are created for each | |
253 * property specified in the property lists provided in property_counters[]. | |
254 * Property counters have a counter name space prefix prepended to the | |
255 * property name as indicated in property_counters[]. | |
256 */ | |
257 void StatSampler::create_system_property_instrumentation(TRAPS) { | |
258 | |
259 ResourceMark rm; | |
260 | |
261 for (int i = 0; property_counters[i].property_list != NULL; i++) { | |
262 | |
263 for (int j = 0; property_counters[i].property_list[j] != NULL; j++) { | |
264 | |
265 const char* property_name = property_counters[i].property_list[j]; | |
266 assert(property_name != NULL, "property name should not be NULL"); | |
267 | |
268 const char* value = get_system_property(property_name, CHECK); | |
269 | |
270 // the property must exist | |
271 assert(value != NULL, "property name should be valid"); | |
272 | |
273 if (value != NULL) { | |
274 // create the property counter | |
275 PerfDataManager::create_string_constant(property_counters[i].name_space, | |
276 property_name, value, CHECK); | |
277 } | |
278 } | |
279 } | |
280 } | |
281 | |
282 /* | |
283 * The create_misc_perfdata() method provides a place to create | |
284 * PerfData instances that would otherwise have no better place | |
285 * to exist. | |
286 */ | |
287 void StatSampler::create_misc_perfdata() { | |
288 | |
289 ResourceMark rm; | |
290 EXCEPTION_MARK; | |
291 | |
292 // numeric constants | |
293 | |
294 // frequency of the native high resolution timer | |
295 PerfDataManager::create_constant(SUN_OS, "hrt.frequency", | |
296 PerfData::U_Hertz, os::elapsed_frequency(), | |
297 CHECK); | |
298 | |
299 // string constants | |
300 | |
301 // create string instrumentation for various Java properties. | |
302 create_system_property_instrumentation(CHECK); | |
303 | |
304 // hotspot flags (from .hotspotrc) and args (from command line) | |
305 // | |
306 PerfDataManager::create_string_constant(JAVA_RT, "vmFlags", | |
307 Arguments::jvm_flags(), CHECK); | |
308 PerfDataManager::create_string_constant(JAVA_RT, "vmArgs", | |
309 Arguments::jvm_args(), CHECK); | |
310 | |
311 // java class name/jar file and arguments to main class | |
312 // note: name is cooridnated with launcher and Arguments.cpp | |
313 PerfDataManager::create_string_constant(SUN_RT, "javaCommand", | |
314 Arguments::java_command(), CHECK); | |
315 | |
316 // the Java VM Internal version string | |
317 PerfDataManager::create_string_constant(SUN_RT, "internalVersion", | |
318 VM_Version::internal_vm_info_string(), | |
319 CHECK); | |
320 | |
321 // create sampled instrumentation objects | |
322 create_sampled_perfdata(); | |
323 } | |
324 | |
325 /* | |
326 * helper class to provide for sampling of the elapsed_counter value | |
327 * maintained in the OS class. | |
328 */ | |
329 class HighResTimeSampler : public PerfSampleHelper { | |
330 public: | |
331 jlong take_sample() { return os::elapsed_counter(); } | |
332 }; | |
333 | |
334 /* | |
335 * the create_sampled_perdata() method provides a place to instantiate | |
336 * sampled PerfData instances that would otherwise have no better place | |
337 * to exist. | |
338 */ | |
339 void StatSampler::create_sampled_perfdata() { | |
340 | |
341 EXCEPTION_MARK; | |
342 | |
343 // setup sampling of the elapsed time counter maintained in the | |
344 // the os class. This counter can be used as either a time stamp | |
345 // for each logged entry or as a liveness indicator for the VM. | |
346 PerfSampleHelper* psh = new HighResTimeSampler(); | |
347 PerfDataManager::create_counter(SUN_OS, "hrt.ticks", | |
348 PerfData::U_Ticks, psh, CHECK); | |
349 } | |
350 | |
351 /* | |
352 * the statSampler_exit() function is called from os_init.cpp on | |
353 * exit of the vm. | |
354 */ | |
355 void statSampler_exit() { | |
356 | |
357 if (!UsePerfData) return; | |
358 | |
359 StatSampler::destroy(); | |
360 } |