|
6197
|
1 /*
|
|
|
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
|
|
|
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
|
20 * or visit www.oracle.com if you need additional information or have any
|
|
|
21 * questions.
|
|
|
22 *
|
|
|
23 */
|
|
|
24 #include "precompiled.hpp"
|
|
|
25
|
|
|
26 #include "runtime/atomic.hpp"
|
|
|
27 #include "runtime/interfaceSupport.hpp"
|
|
|
28 #include "runtime/mutexLocker.hpp"
|
|
|
29 #include "runtime/safepoint.hpp"
|
|
|
30 #include "runtime/threadCritical.hpp"
|
|
|
31 #include "services/memPtr.hpp"
|
|
|
32 #include "services/memReporter.hpp"
|
|
|
33 #include "services/memTracker.hpp"
|
|
|
34 #include "utilities/decoder.hpp"
|
|
|
35 #include "utilities/globalDefinitions.hpp"
|
|
|
36
|
|
|
37 bool NMT_track_callsite = false;
|
|
|
38
|
|
|
39 // walk all 'known' threads at NMT sync point, and collect their recorders
|
|
|
40 void SyncThreadRecorderClosure::do_thread(Thread* thread) {
|
|
|
41 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required");
|
|
|
42 if (thread->is_Java_thread()) {
|
|
|
43 JavaThread* javaThread = (JavaThread*)thread;
|
|
|
44 MemRecorder* recorder = javaThread->get_recorder();
|
|
|
45 if (recorder != NULL) {
|
|
|
46 MemTracker::enqueue_pending_recorder(recorder);
|
|
|
47 javaThread->set_recorder(NULL);
|
|
|
48 }
|
|
|
49 }
|
|
|
50 _thread_count ++;
|
|
|
51 }
|
|
|
52
|
|
|
53
|
|
|
54 MemRecorder* MemTracker::_global_recorder = NULL;
|
|
|
55 MemSnapshot* MemTracker::_snapshot = NULL;
|
|
|
56 MemBaseline MemTracker::_baseline;
|
|
|
57 Mutex MemTracker::_query_lock(Monitor::native, "NMT_queryLock");
|
|
|
58 volatile MemRecorder* MemTracker::_merge_pending_queue = NULL;
|
|
|
59 volatile MemRecorder* MemTracker::_pooled_recorders = NULL;
|
|
|
60 MemTrackWorker* MemTracker::_worker_thread = NULL;
|
|
|
61 int MemTracker::_sync_point_skip_count = 0;
|
|
|
62 MemTracker::NMTLevel MemTracker::_tracking_level = MemTracker::NMT_off;
|
|
|
63 volatile MemTracker::NMTStates MemTracker::_state = NMT_uninited;
|
|
|
64 MemTracker::ShutdownReason MemTracker::_reason = NMT_shutdown_none;
|
|
|
65 int MemTracker::_thread_count = 255;
|
|
|
66 volatile jint MemTracker::_pooled_recorder_count = 0;
|
|
|
67 debug_only(intx MemTracker::_main_thread_tid = 0;)
|
|
|
68 debug_only(volatile jint MemTracker::_pending_recorder_count = 0;)
|
|
|
69
|
|
|
70 void MemTracker::init_tracking_options(const char* option_line) {
|
|
|
71 _tracking_level = NMT_off;
|
|
|
72 if (strncmp(option_line, "=summary", 8) == 0) {
|
|
|
73 _tracking_level = NMT_summary;
|
|
|
74 } else if (strncmp(option_line, "=detail", 8) == 0) {
|
|
|
75 _tracking_level = NMT_detail;
|
|
|
76 }
|
|
|
77 }
|
|
|
78
|
|
|
79 // first phase of bootstrapping, when VM is still in single-threaded mode.
|
|
|
80 void MemTracker::bootstrap_single_thread() {
|
|
|
81 if (_tracking_level > NMT_off) {
|
|
|
82 assert(_state == NMT_uninited, "wrong state");
|
|
|
83
|
|
|
84 // NMT is not supported with UseMallocOnly is on. NMT can NOT
|
|
|
85 // handle the amount of malloc data without significantly impacting
|
|
|
86 // runtime performance when this flag is on.
|
|
|
87 if (UseMallocOnly) {
|
|
|
88 shutdown(NMT_use_malloc_only);
|
|
|
89 return;
|
|
|
90 }
|
|
|
91
|
|
|
92 debug_only(_main_thread_tid = os::current_thread_id();)
|
|
|
93 _state = NMT_bootstrapping_single_thread;
|
|
|
94 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack());
|
|
|
95 }
|
|
|
96 }
|
|
|
97
|
|
|
98 // second phase of bootstrapping, when VM is about to or already entered multi-theaded mode.
|
|
|
99 void MemTracker::bootstrap_multi_thread() {
|
|
|
100 if (_tracking_level > NMT_off && _state == NMT_bootstrapping_single_thread) {
|
|
|
101 // create nmt lock for multi-thread execution
|
|
|
102 assert(_main_thread_tid == os::current_thread_id(), "wrong thread");
|
|
|
103 _state = NMT_bootstrapping_multi_thread;
|
|
|
104 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack());
|
|
|
105 }
|
|
|
106 }
|
|
|
107
|
|
|
108 // fully start nmt
|
|
|
109 void MemTracker::start() {
|
|
|
110 // Native memory tracking is off from command line option
|
|
|
111 if (_tracking_level == NMT_off || shutdown_in_progress()) return;
|
|
|
112
|
|
|
113 assert(_main_thread_tid == os::current_thread_id(), "wrong thread");
|
|
|
114 assert(_state == NMT_bootstrapping_multi_thread, "wrong state");
|
|
|
115
|
|
|
116 _snapshot = new (std::nothrow)MemSnapshot();
|
|
|
117 if (_snapshot != NULL && !_snapshot->out_of_memory()) {
|
|
|
118 if (start_worker()) {
|
|
|
119 _state = NMT_started;
|
|
|
120 NMT_track_callsite = (_tracking_level == NMT_detail && can_walk_stack());
|
|
|
121 return;
|
|
|
122 }
|
|
|
123 }
|
|
|
124
|
|
|
125 // fail to start native memory tracking, shut it down
|
|
|
126 shutdown(NMT_initialization);
|
|
|
127 }
|
|
|
128
|
|
|
129 /**
|
|
|
130 * Shutting down native memory tracking.
|
|
|
131 * We can not shutdown native memory tracking immediately, so we just
|
|
|
132 * setup shutdown pending flag, every native memory tracking component
|
|
|
133 * should orderly shut itself down.
|
|
|
134 *
|
|
|
135 * The shutdown sequences:
|
|
|
136 * 1. MemTracker::shutdown() sets MemTracker to shutdown pending state
|
|
|
137 * 2. Worker thread calls MemTracker::final_shutdown(), which transites
|
|
|
138 * MemTracker to final shutdown state.
|
|
|
139 * 3. At sync point, MemTracker does final cleanup, before sets memory
|
|
|
140 * tracking level to off to complete shutdown.
|
|
|
141 */
|
|
|
142 void MemTracker::shutdown(ShutdownReason reason) {
|
|
|
143 if (_tracking_level == NMT_off) return;
|
|
|
144
|
|
|
145 if (_state <= NMT_bootstrapping_single_thread) {
|
|
|
146 // we still in single thread mode, there is not contention
|
|
|
147 _state = NMT_shutdown_pending;
|
|
|
148 _reason = reason;
|
|
|
149 } else {
|
|
|
150 // we want to know who initialized shutdown
|
|
|
151 if ((jint)NMT_started == Atomic::cmpxchg((jint)NMT_shutdown_pending,
|
|
|
152 (jint*)&_state, (jint)NMT_started)) {
|
|
|
153 _reason = reason;
|
|
|
154 }
|
|
|
155 }
|
|
|
156 }
|
|
|
157
|
|
|
158 // final phase of shutdown
|
|
|
159 void MemTracker::final_shutdown() {
|
|
|
160 // delete all pending recorders and pooled recorders
|
|
|
161 delete_all_pending_recorders();
|
|
|
162 delete_all_pooled_recorders();
|
|
|
163
|
|
|
164 {
|
|
|
165 // shared baseline and snapshot are the only objects needed to
|
|
|
166 // create query results
|
|
|
167 MutexLockerEx locker(&_query_lock, true);
|
|
|
168 // cleanup baseline data and snapshot
|
|
|
169 _baseline.clear();
|
|
|
170 delete _snapshot;
|
|
|
171 _snapshot = NULL;
|
|
|
172 }
|
|
|
173
|
|
|
174 // shutdown shared decoder instance, since it is only
|
|
|
175 // used by native memory tracking so far.
|
|
|
176 Decoder::shutdown();
|
|
|
177
|
|
|
178 MemTrackWorker* worker = NULL;
|
|
|
179 {
|
|
|
180 ThreadCritical tc;
|
|
|
181 // can not delete worker inside the thread critical
|
|
|
182 if (_worker_thread != NULL && Thread::current() == _worker_thread) {
|
|
|
183 worker = _worker_thread;
|
|
|
184 _worker_thread = NULL;
|
|
|
185 }
|
|
|
186 }
|
|
|
187 if (worker != NULL) {
|
|
|
188 delete worker;
|
|
|
189 }
|
|
|
190 _state = NMT_final_shutdown;
|
|
|
191 }
|
|
|
192
|
|
|
193 // delete all pooled recorders
|
|
|
194 void MemTracker::delete_all_pooled_recorders() {
|
|
|
195 // free all pooled recorders
|
|
|
196 volatile MemRecorder* cur_head = _pooled_recorders;
|
|
|
197 if (cur_head != NULL) {
|
|
|
198 MemRecorder* null_ptr = NULL;
|
|
|
199 while (cur_head != NULL && (void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr,
|
|
|
200 (void*)&_pooled_recorders, (void*)cur_head)) {
|
|
|
201 cur_head = _pooled_recorders;
|
|
|
202 }
|
|
|
203 if (cur_head != NULL) {
|
|
|
204 delete cur_head;
|
|
|
205 _pooled_recorder_count = 0;
|
|
|
206 }
|
|
|
207 }
|
|
|
208 }
|
|
|
209
|
|
|
210 // delete all recorders in pending queue
|
|
|
211 void MemTracker::delete_all_pending_recorders() {
|
|
|
212 // free all pending recorders
|
|
|
213 MemRecorder* pending_head = get_pending_recorders();
|
|
|
214 if (pending_head != NULL) {
|
|
|
215 delete pending_head;
|
|
|
216 }
|
|
|
217 }
|
|
|
218
|
|
|
219 /*
|
|
|
220 * retrieve per-thread recorder of specified thread.
|
|
|
221 * if thread == NULL, it means global recorder
|
|
|
222 */
|
|
|
223 MemRecorder* MemTracker::get_thread_recorder(JavaThread* thread) {
|
|
|
224 if (shutdown_in_progress()) return NULL;
|
|
|
225
|
|
|
226 MemRecorder* rc;
|
|
|
227 if (thread == NULL) {
|
|
|
228 rc = _global_recorder;
|
|
|
229 } else {
|
|
|
230 rc = thread->get_recorder();
|
|
|
231 }
|
|
|
232
|
|
|
233 if (rc != NULL && rc->is_full()) {
|
|
|
234 enqueue_pending_recorder(rc);
|
|
|
235 rc = NULL;
|
|
|
236 }
|
|
|
237
|
|
|
238 if (rc == NULL) {
|
|
|
239 rc = get_new_or_pooled_instance();
|
|
|
240 if (thread == NULL) {
|
|
|
241 _global_recorder = rc;
|
|
|
242 } else {
|
|
|
243 thread->set_recorder(rc);
|
|
|
244 }
|
|
|
245 }
|
|
|
246 return rc;
|
|
|
247 }
|
|
|
248
|
|
|
249 /*
|
|
|
250 * get a per-thread recorder from pool, or create a new one if
|
|
|
251 * there is not one available.
|
|
|
252 */
|
|
|
253 MemRecorder* MemTracker::get_new_or_pooled_instance() {
|
|
|
254 MemRecorder* cur_head = const_cast<MemRecorder*> (_pooled_recorders);
|
|
|
255 if (cur_head == NULL) {
|
|
|
256 MemRecorder* rec = new (std::nothrow)MemRecorder();
|
|
|
257 if (rec == NULL || rec->out_of_memory()) {
|
|
|
258 shutdown(NMT_out_of_memory);
|
|
|
259 if (rec != NULL) {
|
|
|
260 delete rec;
|
|
|
261 rec = NULL;
|
|
|
262 }
|
|
|
263 }
|
|
|
264 return rec;
|
|
|
265 } else {
|
|
|
266 MemRecorder* next_head = cur_head->next();
|
|
|
267 if ((void*)cur_head != Atomic::cmpxchg_ptr((void*)next_head, (void*)&_pooled_recorders,
|
|
|
268 (void*)cur_head)) {
|
|
|
269 return get_new_or_pooled_instance();
|
|
|
270 }
|
|
|
271 cur_head->set_next(NULL);
|
|
|
272 Atomic::dec(&_pooled_recorder_count);
|
|
|
273 debug_only(cur_head->set_generation();)
|
|
|
274 return cur_head;
|
|
|
275 }
|
|
|
276 }
|
|
|
277
|
|
|
278 /*
|
|
|
279 * retrieve all recorders in pending queue, and empty the queue
|
|
|
280 */
|
|
|
281 MemRecorder* MemTracker::get_pending_recorders() {
|
|
|
282 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
|
|
|
283 MemRecorder* null_ptr = NULL;
|
|
|
284 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)null_ptr, (void*)&_merge_pending_queue,
|
|
|
285 (void*)cur_head)) {
|
|
|
286 cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
|
|
|
287 }
|
|
|
288 debug_only(Atomic::store(0, &_pending_recorder_count));
|
|
|
289 return cur_head;
|
|
|
290 }
|
|
|
291
|
|
|
292 /*
|
|
|
293 * release a recorder to recorder pool.
|
|
|
294 */
|
|
|
295 void MemTracker::release_thread_recorder(MemRecorder* rec) {
|
|
|
296 assert(rec != NULL, "null recorder");
|
|
|
297 // we don't want to pool too many recorders
|
|
|
298 rec->set_next(NULL);
|
|
|
299 if (shutdown_in_progress() || _pooled_recorder_count > _thread_count * 2) {
|
|
|
300 delete rec;
|
|
|
301 return;
|
|
|
302 }
|
|
|
303
|
|
|
304 rec->clear();
|
|
|
305 MemRecorder* cur_head = const_cast<MemRecorder*>(_pooled_recorders);
|
|
|
306 rec->set_next(cur_head);
|
|
|
307 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_pooled_recorders,
|
|
|
308 (void*)cur_head)) {
|
|
|
309 cur_head = const_cast<MemRecorder*>(_pooled_recorders);
|
|
|
310 rec->set_next(cur_head);
|
|
|
311 }
|
|
|
312 Atomic::inc(&_pooled_recorder_count);
|
|
|
313 }
|
|
|
314
|
|
|
315 /*
|
|
|
316 * This is the most important method in whole nmt implementation.
|
|
|
317 *
|
|
|
318 * Create a memory record.
|
|
|
319 * 1. When nmt is in single-threaded bootstrapping mode, no lock is needed as VM
|
|
|
320 * still in single thread mode.
|
|
|
321 * 2. For all threads other than JavaThread, ThreadCritical is needed
|
|
|
322 * to write to recorders to global recorder.
|
|
|
323 * 3. For JavaThreads that are not longer visible by safepoint, also
|
|
|
324 * need to take ThreadCritical and records are written to global
|
|
|
325 * recorders, since these threads are NOT walked by Threads.do_thread().
|
|
|
326 * 4. JavaThreads that are running in native state, have to transition
|
|
|
327 * to VM state before writing to per-thread recorders.
|
|
|
328 * 5. JavaThreads that are running in VM state do not need any lock and
|
|
|
329 * records are written to per-thread recorders.
|
|
|
330 * 6. For a thread has yet to attach VM 'Thread', they need to take
|
|
|
331 * ThreadCritical to write to global recorder.
|
|
|
332 *
|
|
|
333 * Important note:
|
|
|
334 * NO LOCK should be taken inside ThreadCritical lock !!!
|
|
|
335 */
|
|
|
336 void MemTracker::create_memory_record(address addr, MEMFLAGS flags,
|
|
|
337 size_t size, address pc, Thread* thread) {
|
|
|
338 if (!shutdown_in_progress()) {
|
|
|
339 // single thread, we just write records direct to global recorder,'
|
|
|
340 // with any lock
|
|
|
341 if (_state == NMT_bootstrapping_single_thread) {
|
|
|
342 assert(_main_thread_tid == os::current_thread_id(), "wrong thread");
|
|
|
343 thread = NULL;
|
|
|
344 } else {
|
|
|
345 if (thread == NULL) {
|
|
|
346 // don't use Thread::current(), since it is possible that
|
|
|
347 // the calling thread has yet to attach to VM 'Thread',
|
|
|
348 // which will result assertion failure
|
|
|
349 thread = ThreadLocalStorage::thread();
|
|
|
350 }
|
|
|
351 }
|
|
|
352
|
|
|
353 if (thread != NULL) {
|
|
|
354 if (thread->is_Java_thread() && ((JavaThread*)thread)->is_safepoint_visible()) {
|
|
6231
|
355 JavaThread* java_thread = static_cast<JavaThread*>(thread);
|
|
|
356 JavaThreadState state = java_thread->thread_state();
|
|
|
357 if (SafepointSynchronize::safepoint_safe(java_thread, state)) {
|
|
|
358 // JavaThreads that are safepoint safe, can run through safepoint,
|
|
|
359 // so ThreadCritical is needed to ensure no threads at safepoint create
|
|
|
360 // new records while the records are being gathered and the sequence number is changing
|
|
|
361 ThreadCritical tc;
|
|
|
362 create_record_in_recorder(addr, flags, size, pc, java_thread);
|
|
6197
|
363 } else {
|
|
6231
|
364 create_record_in_recorder(addr, flags, size, pc, java_thread);
|
|
6197
|
365 }
|
|
|
366 } else {
|
|
|
367 // other threads, such as worker and watcher threads, etc. need to
|
|
|
368 // take ThreadCritical to write to global recorder
|
|
|
369 ThreadCritical tc;
|
|
|
370 create_record_in_recorder(addr, flags, size, pc, NULL);
|
|
|
371 }
|
|
|
372 } else {
|
|
|
373 if (_state == NMT_bootstrapping_single_thread) {
|
|
|
374 // single thread, no lock needed
|
|
|
375 create_record_in_recorder(addr, flags, size, pc, NULL);
|
|
|
376 } else {
|
|
|
377 // for thread has yet to attach VM 'Thread', we can not use VM mutex.
|
|
|
378 // use native thread critical instead
|
|
|
379 ThreadCritical tc;
|
|
|
380 create_record_in_recorder(addr, flags, size, pc, NULL);
|
|
|
381 }
|
|
|
382 }
|
|
|
383 }
|
|
|
384 }
|
|
|
385
|
|
|
386 // write a record to proper recorder. No lock can be taken from this method
|
|
|
387 // down.
|
|
|
388 void MemTracker::create_record_in_recorder(address addr, MEMFLAGS flags,
|
|
6231
|
389 size_t size, address pc, JavaThread* thread) {
|
|
6197
|
390
|
|
6231
|
391 MemRecorder* rc = get_thread_recorder(thread);
|
|
6197
|
392 if (rc != NULL) {
|
|
|
393 rc->record(addr, flags, size, pc);
|
|
|
394 }
|
|
|
395 }
|
|
|
396
|
|
|
397 /**
|
|
|
398 * enqueue a recorder to pending queue
|
|
|
399 */
|
|
|
400 void MemTracker::enqueue_pending_recorder(MemRecorder* rec) {
|
|
|
401 assert(rec != NULL, "null recorder");
|
|
|
402
|
|
|
403 // we are shutting down, so just delete it
|
|
|
404 if (shutdown_in_progress()) {
|
|
|
405 rec->set_next(NULL);
|
|
|
406 delete rec;
|
|
|
407 return;
|
|
|
408 }
|
|
|
409
|
|
|
410 MemRecorder* cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
|
|
|
411 rec->set_next(cur_head);
|
|
|
412 while ((void*)cur_head != Atomic::cmpxchg_ptr((void*)rec, (void*)&_merge_pending_queue,
|
|
|
413 (void*)cur_head)) {
|
|
|
414 cur_head = const_cast<MemRecorder*>(_merge_pending_queue);
|
|
|
415 rec->set_next(cur_head);
|
|
|
416 }
|
|
|
417 debug_only(Atomic::inc(&_pending_recorder_count);)
|
|
|
418 }
|
|
|
419
|
|
|
420 /*
|
|
|
421 * The method is called at global safepoint
|
|
|
422 * during it synchronization process.
|
|
|
423 * 1. enqueue all JavaThreads' per-thread recorders
|
|
|
424 * 2. enqueue global recorder
|
|
|
425 * 3. retrieve all pending recorders
|
|
|
426 * 4. reset global sequence number generator
|
|
|
427 * 5. call worker's sync
|
|
|
428 */
|
|
|
429 #define MAX_SAFEPOINTS_TO_SKIP 128
|
|
|
430 #define SAFE_SEQUENCE_THRESHOLD 30
|
|
|
431 #define HIGH_GENERATION_THRESHOLD 60
|
|
|
432
|
|
|
433 void MemTracker::sync() {
|
|
|
434 assert(_tracking_level > NMT_off, "NMT is not enabled");
|
|
|
435 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required");
|
|
|
436
|
|
|
437 // Some GC tests hit large number of safepoints in short period of time
|
|
|
438 // without meaningful activities. We should prevent going to
|
|
|
439 // sync point in these cases, which can potentially exhaust generation buffer.
|
|
|
440 // Here is the factots to determine if we should go into sync point:
|
|
|
441 // 1. not to overflow sequence number
|
|
|
442 // 2. if we are in danger to overflow generation buffer
|
|
|
443 // 3. how many safepoints we already skipped sync point
|
|
|
444 if (_state == NMT_started) {
|
|
|
445 // worker thread is not ready, no one can manage generation
|
|
|
446 // buffer, so skip this safepoint
|
|
|
447 if (_worker_thread == NULL) return;
|
|
|
448
|
|
|
449 if (_sync_point_skip_count < MAX_SAFEPOINTS_TO_SKIP) {
|
|
|
450 int per_seq_in_use = SequenceGenerator::peek() * 100 / max_jint;
|
|
|
451 int per_gen_in_use = _worker_thread->generations_in_use() * 100 / MAX_GENERATIONS;
|
|
|
452 if (per_seq_in_use < SAFE_SEQUENCE_THRESHOLD && per_gen_in_use >= HIGH_GENERATION_THRESHOLD) {
|
|
|
453 _sync_point_skip_count ++;
|
|
|
454 return;
|
|
|
455 }
|
|
|
456 }
|
|
|
457 _sync_point_skip_count = 0;
|
|
|
458 {
|
|
|
459 // This method is running at safepoint, with ThreadCritical lock,
|
|
|
460 // it should guarantee that NMT is fully sync-ed.
|
|
|
461 ThreadCritical tc;
|
|
6231
|
462
|
|
|
463 // walk all JavaThreads to collect recorders
|
|
|
464 SyncThreadRecorderClosure stc;
|
|
|
465 Threads::threads_do(&stc);
|
|
|
466
|
|
|
467 _thread_count = stc.get_thread_count();
|
|
|
468 MemRecorder* pending_recorders = get_pending_recorders();
|
|
|
469
|
|
6197
|
470 if (_global_recorder != NULL) {
|
|
|
471 _global_recorder->set_next(pending_recorders);
|
|
|
472 pending_recorders = _global_recorder;
|
|
|
473 _global_recorder = NULL;
|
|
|
474 }
|
|
|
475 SequenceGenerator::reset();
|
|
|
476 // check _worker_thread with lock to avoid racing condition
|
|
|
477 if (_worker_thread != NULL) {
|
|
|
478 _worker_thread->at_sync_point(pending_recorders);
|
|
|
479 }
|
|
|
480 }
|
|
|
481 }
|
|
|
482
|
|
|
483 // now, it is the time to shut whole things off
|
|
|
484 if (_state == NMT_final_shutdown) {
|
|
|
485 // walk all JavaThreads to delete all recorders
|
|
|
486 SyncThreadRecorderClosure stc;
|
|
|
487 Threads::threads_do(&stc);
|
|
|
488 // delete global recorder
|
|
|
489 {
|
|
|
490 ThreadCritical tc;
|
|
|
491 if (_global_recorder != NULL) {
|
|
|
492 delete _global_recorder;
|
|
|
493 _global_recorder = NULL;
|
|
|
494 }
|
|
|
495 }
|
|
6231
|
496 MemRecorder* pending_recorders = get_pending_recorders();
|
|
|
497 if (pending_recorders != NULL) {
|
|
|
498 delete pending_recorders;
|
|
|
499 }
|
|
|
500 // try at a later sync point to ensure MemRecorder instance drops to zero to
|
|
|
501 // completely shutdown NMT
|
|
|
502 if (MemRecorder::_instance_count == 0) {
|
|
|
503 _state = NMT_shutdown;
|
|
|
504 _tracking_level = NMT_off;
|
|
|
505 }
|
|
6197
|
506 }
|
|
|
507 }
|
|
|
508
|
|
|
509 /*
|
|
|
510 * Start worker thread.
|
|
|
511 */
|
|
|
512 bool MemTracker::start_worker() {
|
|
|
513 assert(_worker_thread == NULL, "Just Check");
|
|
|
514 _worker_thread = new (std::nothrow) MemTrackWorker();
|
|
|
515 if (_worker_thread == NULL || _worker_thread->has_error()) {
|
|
|
516 shutdown(NMT_initialization);
|
|
|
517 return false;
|
|
|
518 }
|
|
|
519 _worker_thread->start();
|
|
|
520 return true;
|
|
|
521 }
|
|
|
522
|
|
|
523 /*
|
|
|
524 * We need to collect a JavaThread's per-thread recorder
|
|
|
525 * before it exits.
|
|
|
526 */
|
|
|
527 void MemTracker::thread_exiting(JavaThread* thread) {
|
|
|
528 if (is_on()) {
|
|
|
529 MemRecorder* rec = thread->get_recorder();
|
|
|
530 if (rec != NULL) {
|
|
|
531 enqueue_pending_recorder(rec);
|
|
|
532 thread->set_recorder(NULL);
|
|
|
533 }
|
|
|
534 }
|
|
|
535 }
|
|
|
536
|
|
|
537 // baseline current memory snapshot
|
|
|
538 bool MemTracker::baseline() {
|
|
|
539 MutexLockerEx lock(&_query_lock, true);
|
|
|
540 MemSnapshot* snapshot = get_snapshot();
|
|
|
541 if (snapshot != NULL) {
|
|
|
542 return _baseline.baseline(*snapshot, false);
|
|
|
543 }
|
|
|
544 return false;
|
|
|
545 }
|
|
|
546
|
|
|
547 // print memory usage from current snapshot
|
|
|
548 bool MemTracker::print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) {
|
|
|
549 MemBaseline baseline;
|
|
|
550 MutexLockerEx lock(&_query_lock, true);
|
|
|
551 MemSnapshot* snapshot = get_snapshot();
|
|
|
552 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) {
|
|
|
553 BaselineReporter reporter(out, unit);
|
|
|
554 reporter.report_baseline(baseline, summary_only);
|
|
|
555 return true;
|
|
|
556 }
|
|
|
557 return false;
|
|
|
558 }
|
|
|
559
|
|
|
560 // compare memory usage between current snapshot and baseline
|
|
|
561 bool MemTracker::compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only) {
|
|
|
562 MutexLockerEx lock(&_query_lock, true);
|
|
|
563 if (_baseline.baselined()) {
|
|
|
564 MemBaseline baseline;
|
|
|
565 MemSnapshot* snapshot = get_snapshot();
|
|
|
566 if (snapshot != NULL && baseline.baseline(*snapshot, summary_only)) {
|
|
|
567 BaselineReporter reporter(out, unit);
|
|
|
568 reporter.diff_baselines(baseline, _baseline, summary_only);
|
|
|
569 return true;
|
|
|
570 }
|
|
|
571 }
|
|
|
572 return false;
|
|
|
573 }
|
|
|
574
|
|
|
575 #ifndef PRODUCT
|
|
|
576 void MemTracker::walk_stack(int toSkip, char* buf, int len) {
|
|
|
577 int cur_len = 0;
|
|
|
578 char tmp[1024];
|
|
|
579 address pc;
|
|
|
580
|
|
|
581 while (cur_len < len) {
|
|
|
582 pc = os::get_caller_pc(toSkip + 1);
|
|
|
583 if (pc != NULL && os::dll_address_to_function_name(pc, tmp, sizeof(tmp), NULL)) {
|
|
|
584 jio_snprintf(&buf[cur_len], (len - cur_len), "%s\n", tmp);
|
|
|
585 cur_len = (int)strlen(buf);
|
|
|
586 } else {
|
|
|
587 buf[cur_len] = '\0';
|
|
|
588 break;
|
|
|
589 }
|
|
|
590 toSkip ++;
|
|
|
591 }
|
|
|
592 }
|
|
|
593
|
|
|
594 void MemTracker::print_tracker_stats(outputStream* st) {
|
|
|
595 st->print_cr("\nMemory Tracker Stats:");
|
|
|
596 st->print_cr("\tMax sequence number = %d", SequenceGenerator::max_seq_num());
|
|
|
597 st->print_cr("\tthead count = %d", _thread_count);
|
|
|
598 st->print_cr("\tArena instance = %d", Arena::_instance_count);
|
|
|
599 st->print_cr("\tpooled recorder count = %d", _pooled_recorder_count);
|
|
|
600 st->print_cr("\tqueued recorder count = %d", _pending_recorder_count);
|
|
|
601 st->print_cr("\tmemory recorder instance count = %d", MemRecorder::_instance_count);
|
|
|
602 if (_worker_thread != NULL) {
|
|
|
603 st->print_cr("\tWorker thread:");
|
|
|
604 st->print_cr("\t\tSync point count = %d", _worker_thread->_sync_point_count);
|
|
|
605 st->print_cr("\t\tpending recorder count = %d", _worker_thread->count_pending_recorders());
|
|
|
606 st->print_cr("\t\tmerge count = %d", _worker_thread->_merge_count);
|
|
|
607 } else {
|
|
|
608 st->print_cr("\tWorker thread is not started");
|
|
|
609 }
|
|
|
610 st->print_cr(" ");
|
|
|
611
|
|
|
612 if (_snapshot != NULL) {
|
|
|
613 _snapshot->print_snapshot_stats(st);
|
|
|
614 } else {
|
|
|
615 st->print_cr("No snapshot");
|
|
|
616 }
|
|
|
617 }
|
|
|
618 #endif
|
|
|
619
|
