Fri, 31 Oct 2014 12:16:20 +0100
8062169: Multiple OSR compilations issued for same bci
Summary: Fixed 'SimpleThresholdPolicy::event' to always perform OSR if an OSR nmethod is available.
Reviewed-by: kvn, iveresov
1 /*
2 * Copyright (c) 1997, 2014, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "gc_implementation/shared/isGCActiveMark.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "oops/symbol.hpp"
33 #include "runtime/arguments.hpp"
34 #include "runtime/deoptimization.hpp"
35 #include "runtime/interfaceSupport.hpp"
36 #include "runtime/sweeper.hpp"
37 #include "runtime/thread.inline.hpp"
38 #include "runtime/vm_operations.hpp"
39 #include "services/threadService.hpp"
40 #include "trace/tracing.hpp"
42 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
44 #define VM_OP_NAME_INITIALIZE(name) #name,
46 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
47 { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
49 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
50 _calling_thread = thread;
51 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
52 _priority = priority;
53 }
56 void VM_Operation::evaluate() {
57 ResourceMark rm;
58 if (TraceVMOperation) {
59 tty->print("[");
60 NOT_PRODUCT(print();)
61 }
62 doit();
63 if (TraceVMOperation) {
64 tty->print_cr("]");
65 }
66 }
68 const char* VM_Operation::mode_to_string(Mode mode) {
69 switch(mode) {
70 case _safepoint : return "safepoint";
71 case _no_safepoint : return "no safepoint";
72 case _concurrent : return "concurrent";
73 case _async_safepoint: return "async safepoint";
74 default : return "unknown";
75 }
76 }
77 // Called by fatal error handler.
78 void VM_Operation::print_on_error(outputStream* st) const {
79 st->print("VM_Operation (" PTR_FORMAT "): ", this);
80 st->print("%s", name());
82 const char* mode = mode_to_string(evaluation_mode());
83 st->print(", mode: %s", mode);
85 if (calling_thread()) {
86 st->print(", requested by thread " PTR_FORMAT, calling_thread());
87 }
88 }
90 void VM_ThreadStop::doit() {
91 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
92 JavaThread* target = java_lang_Thread::thread(target_thread());
93 // Note that this now allows multiple ThreadDeath exceptions to be
94 // thrown at a thread.
95 if (target != NULL) {
96 // the thread has run and is not already in the process of exiting
97 target->send_thread_stop(throwable());
98 }
99 }
101 void VM_Deoptimize::doit() {
102 // We do not want any GCs to happen while we are in the middle of this VM operation
103 ResourceMark rm;
104 DeoptimizationMarker dm;
106 // Deoptimize all activations depending on marked nmethods
107 Deoptimization::deoptimize_dependents();
109 // Make the dependent methods zombies
110 CodeCache::make_marked_nmethods_zombies();
111 }
114 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) {
115 _thread = thread;
116 _id = id;
117 }
120 void VM_DeoptimizeFrame::doit() {
121 Deoptimization::deoptimize_frame_internal(_thread, _id);
122 }
125 #ifndef PRODUCT
127 void VM_DeoptimizeAll::doit() {
128 DeoptimizationMarker dm;
129 // deoptimize all java threads in the system
130 if (DeoptimizeALot) {
131 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
132 if (thread->has_last_Java_frame()) {
133 thread->deoptimize();
134 }
135 }
136 } else if (DeoptimizeRandom) {
138 // Deoptimize some selected threads and frames
139 int tnum = os::random() & 0x3;
140 int fnum = os::random() & 0x3;
141 int tcount = 0;
142 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
143 if (thread->has_last_Java_frame()) {
144 if (tcount++ == tnum) {
145 tcount = 0;
146 int fcount = 0;
147 // Deoptimize some selected frames.
148 // Biased llocking wants a updated register map
149 for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) {
150 if (fst.current()->can_be_deoptimized()) {
151 if (fcount++ == fnum) {
152 fcount = 0;
153 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map());
154 }
155 }
156 }
157 }
158 }
159 }
160 }
161 }
164 void VM_ZombieAll::doit() {
165 JavaThread *thread = (JavaThread *)calling_thread();
166 assert(thread->is_Java_thread(), "must be a Java thread");
167 thread->make_zombies();
168 }
170 #endif // !PRODUCT
172 void VM_UnlinkSymbols::doit() {
173 JavaThread *thread = (JavaThread *)calling_thread();
174 assert(thread->is_Java_thread(), "must be a Java thread");
175 SymbolTable::unlink();
176 }
178 void VM_Verify::doit() {
179 Universe::heap()->prepare_for_verify();
180 Universe::verify(_silent);
181 }
183 bool VM_PrintThreads::doit_prologue() {
184 assert(Thread::current()->is_Java_thread(), "just checking");
186 // Make sure AbstractOwnableSynchronizer is loaded
187 if (JDK_Version::is_gte_jdk16x_version()) {
188 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
189 }
191 // Get Heap_lock if concurrent locks will be dumped
192 if (_print_concurrent_locks) {
193 Heap_lock->lock();
194 }
195 return true;
196 }
198 void VM_PrintThreads::doit() {
199 Threads::print_on(_out, true, false, _print_concurrent_locks);
200 }
202 void VM_PrintThreads::doit_epilogue() {
203 if (_print_concurrent_locks) {
204 // Release Heap_lock
205 Heap_lock->unlock();
206 }
207 }
209 void VM_PrintJNI::doit() {
210 JNIHandles::print_on(_out);
211 }
213 VM_FindDeadlocks::~VM_FindDeadlocks() {
214 if (_deadlocks != NULL) {
215 DeadlockCycle* cycle = _deadlocks;
216 while (cycle != NULL) {
217 DeadlockCycle* d = cycle;
218 cycle = cycle->next();
219 delete d;
220 }
221 }
222 }
224 bool VM_FindDeadlocks::doit_prologue() {
225 assert(Thread::current()->is_Java_thread(), "just checking");
227 // Load AbstractOwnableSynchronizer class
228 if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) {
229 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
230 }
232 return true;
233 }
235 void VM_FindDeadlocks::doit() {
236 _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks);
237 if (_out != NULL) {
238 int num_deadlocks = 0;
239 for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) {
240 num_deadlocks++;
241 cycle->print_on(_out);
242 }
244 if (num_deadlocks == 1) {
245 _out->print_cr("\nFound 1 deadlock.\n");
246 _out->flush();
247 } else if (num_deadlocks > 1) {
248 _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks);
249 _out->flush();
250 }
251 }
252 }
254 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
255 int max_depth,
256 bool with_locked_monitors,
257 bool with_locked_synchronizers) {
258 _result = result;
259 _num_threads = 0; // 0 indicates all threads
260 _threads = NULL;
261 _result = result;
262 _max_depth = max_depth;
263 _with_locked_monitors = with_locked_monitors;
264 _with_locked_synchronizers = with_locked_synchronizers;
265 }
267 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
268 GrowableArray<instanceHandle>* threads,
269 int num_threads,
270 int max_depth,
271 bool with_locked_monitors,
272 bool with_locked_synchronizers) {
273 _result = result;
274 _num_threads = num_threads;
275 _threads = threads;
276 _result = result;
277 _max_depth = max_depth;
278 _with_locked_monitors = with_locked_monitors;
279 _with_locked_synchronizers = with_locked_synchronizers;
280 }
282 bool VM_ThreadDump::doit_prologue() {
283 assert(Thread::current()->is_Java_thread(), "just checking");
285 // Load AbstractOwnableSynchronizer class before taking thread snapshots
286 if (JDK_Version::is_gte_jdk16x_version()) {
287 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
288 }
290 if (_with_locked_synchronizers) {
291 // Acquire Heap_lock to dump concurrent locks
292 Heap_lock->lock();
293 }
295 return true;
296 }
298 void VM_ThreadDump::doit_epilogue() {
299 if (_with_locked_synchronizers) {
300 // Release Heap_lock
301 Heap_lock->unlock();
302 }
303 }
305 void VM_ThreadDump::doit() {
306 ResourceMark rm;
308 ConcurrentLocksDump concurrent_locks(true);
309 if (_with_locked_synchronizers) {
310 concurrent_locks.dump_at_safepoint();
311 }
313 if (_num_threads == 0) {
314 // Snapshot all live threads
315 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
316 if (jt->is_exiting() ||
317 jt->is_hidden_from_external_view()) {
318 // skip terminating threads and hidden threads
319 continue;
320 }
321 ThreadConcurrentLocks* tcl = NULL;
322 if (_with_locked_synchronizers) {
323 tcl = concurrent_locks.thread_concurrent_locks(jt);
324 }
325 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
326 _result->add_thread_snapshot(ts);
327 }
328 } else {
329 // Snapshot threads in the given _threads array
330 // A dummy snapshot is created if a thread doesn't exist
331 for (int i = 0; i < _num_threads; i++) {
332 instanceHandle th = _threads->at(i);
333 if (th() == NULL) {
334 // skip if the thread doesn't exist
335 // Add a dummy snapshot
336 _result->add_thread_snapshot(new ThreadSnapshot());
337 continue;
338 }
340 // Dump thread stack only if the thread is alive and not exiting
341 // and not VM internal thread.
342 JavaThread* jt = java_lang_Thread::thread(th());
343 if (jt == NULL || /* thread not alive */
344 jt->is_exiting() ||
345 jt->is_hidden_from_external_view()) {
346 // add a NULL snapshot if skipped
347 _result->add_thread_snapshot(new ThreadSnapshot());
348 continue;
349 }
350 ThreadConcurrentLocks* tcl = NULL;
351 if (_with_locked_synchronizers) {
352 tcl = concurrent_locks.thread_concurrent_locks(jt);
353 }
354 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
355 _result->add_thread_snapshot(ts);
356 }
357 }
358 }
360 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) {
361 ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread);
362 snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors);
363 snapshot->set_concurrent_locks(tcl);
364 return snapshot;
365 }
367 volatile bool VM_Exit::_vm_exited = false;
368 Thread * VM_Exit::_shutdown_thread = NULL;
370 int VM_Exit::set_vm_exited() {
371 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
373 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
375 int num_active = 0;
377 _shutdown_thread = thr_cur;
378 _vm_exited = true; // global flag
379 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next())
380 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
381 ++num_active;
382 thr->set_terminated(JavaThread::_vm_exited); // per-thread flag
383 }
385 return num_active;
386 }
388 int VM_Exit::wait_for_threads_in_native_to_block() {
389 // VM exits at safepoint. This function must be called at the final safepoint
390 // to wait for threads in _thread_in_native state to be quiescent.
391 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
393 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
394 Monitor timer(Mutex::leaf, "VM_Exit timer", true);
396 // Compiler threads need longer wait because they can access VM data directly
397 // while in native. If they are active and some structures being used are
398 // deleted by the shutdown sequence, they will crash. On the other hand, user
399 // threads must go through native=>Java/VM transitions first to access VM
400 // data, and they will be stopped during state transition. In theory, we
401 // don't have to wait for user threads to be quiescent, but it's always
402 // better to terminate VM when current thread is the only active thread, so
403 // wait for user threads too. Numbers are in 10 milliseconds.
404 int max_wait_user_thread = 30; // at least 300 milliseconds
405 int max_wait_compiler_thread = 1000; // at least 10 seconds
407 int max_wait = max_wait_compiler_thread;
409 int attempts = 0;
410 while (true) {
411 int num_active = 0;
412 int num_active_compiler_thread = 0;
414 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) {
415 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
416 num_active++;
417 if (thr->is_Compiler_thread()) {
418 num_active_compiler_thread++;
419 }
420 }
421 }
423 if (num_active == 0) {
424 return 0;
425 } else if (attempts > max_wait) {
426 return num_active;
427 } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) {
428 return num_active;
429 }
431 attempts++;
433 MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag);
434 timer.wait(Mutex::_no_safepoint_check_flag, 10);
435 }
436 }
438 void VM_Exit::doit() {
439 CompileBroker::set_should_block();
441 // Wait for a short period for threads in native to block. Any thread
442 // still executing native code after the wait will be stopped at
443 // native==>Java/VM barriers.
444 // Among 16276 JCK tests, 94% of them come here without any threads still
445 // running in native; the other 6% are quiescent within 250ms (Ultra 80).
446 wait_for_threads_in_native_to_block();
448 set_vm_exited();
450 // cleanup globals resources before exiting. exit_globals() currently
451 // cleans up outputStream resources and PerfMemory resources.
452 exit_globals();
454 // Check for exit hook
455 exit_hook_t exit_hook = Arguments::exit_hook();
456 if (exit_hook != NULL) {
457 // exit hook should exit.
458 exit_hook(_exit_code);
459 // ... but if it didn't, we must do it here
460 vm_direct_exit(_exit_code);
461 } else {
462 vm_direct_exit(_exit_code);
463 }
464 }
467 void VM_Exit::wait_if_vm_exited() {
468 if (_vm_exited &&
469 ThreadLocalStorage::get_thread_slow() != _shutdown_thread) {
470 // _vm_exited is set at safepoint, and the Threads_lock is never released
471 // we will block here until the process dies
472 Threads_lock->lock_without_safepoint_check();
473 ShouldNotReachHere();
474 }
475 }