1 /*
2 * Copyright (c) 1998, 2025, 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
25 #include "compiler/compileBroker.hpp"
26 #include "gc/shared/collectedHeap.hpp"
27 #include "gc/shared/vmThreadCpuTimeScope.inline.hpp"
28 #include "jfr/jfrEvents.hpp"
29 #include "jfr/support/jfrThreadId.hpp"
30 #include "logging/log.hpp"
31 #include "logging/logConfiguration.hpp"
32 #include "logging/logStream.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "memory/universe.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "oops/verifyOopClosure.hpp"
37 #include "runtime/atomic.hpp"
38 #include "runtime/cpuTimeCounters.hpp"
39 #include "runtime/handles.inline.hpp"
40 #include "runtime/interfaceSupport.inline.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/javaThread.inline.hpp"
43 #include "runtime/jniHandles.hpp"
44 #include "runtime/mutexLocker.hpp"
45 #include "runtime/os.hpp"
46 #include "runtime/perfData.inline.hpp"
47 #include "runtime/safepoint.hpp"
48 #include "runtime/synchronizer.hpp"
49 #include "runtime/timerTrace.hpp"
50 #include "runtime/vmOperation.hpp"
51 #include "runtime/vmOperations.hpp"
52 #include "runtime/vmThread.hpp"
53 #include "services/management.hpp"
54 #include "utilities/dtrace.hpp"
55 #include "utilities/events.hpp"
56 #include "utilities/vmError.hpp"
57
58
59 //------------------------------------------------------------------------------------------------------------------
60 // Timeout machinery
61
62 void VMOperationTimeoutTask::task() {
63 assert(AbortVMOnVMOperationTimeout, "only if enabled");
64 if (is_armed()) {
65 jlong delay = nanos_to_millis(os::javaTimeNanos() - _arm_time);
66 if (delay > AbortVMOnVMOperationTimeoutDelay) {
67 fatal("%s VM operation took too long: " JLONG_FORMAT " ms elapsed since VM-op start (timeout: %zd ms)",
68 _vm_op_name, delay, AbortVMOnVMOperationTimeoutDelay);
69 }
70 }
71 }
72
73 bool VMOperationTimeoutTask::is_armed() {
74 return Atomic::load_acquire(&_armed) != 0;
75 }
76
77 void VMOperationTimeoutTask::arm(const char* vm_op_name) {
78 _vm_op_name = vm_op_name;
79 _arm_time = os::javaTimeNanos();
80 Atomic::release_store_fence(&_armed, 1);
81 }
82
83 void VMOperationTimeoutTask::disarm() {
84 Atomic::release_store_fence(&_armed, 0);
85
86 // The two stores to `_armed` are counted in VM-op, but they should be
87 // insignificant compared to the actual VM-op duration.
88 jlong vm_op_duration = nanos_to_millis(os::javaTimeNanos() - _arm_time);
89
90 // Repeat the timeout-check logic on the VM thread, because
91 // VMOperationTimeoutTask might miss the arm-disarm window depending on
92 // the scheduling.
93 if (vm_op_duration > AbortVMOnVMOperationTimeoutDelay) {
94 fatal("%s VM operation took too long: completed in " JLONG_FORMAT " ms (timeout: %zd ms)",
95 _vm_op_name, vm_op_duration, AbortVMOnVMOperationTimeoutDelay);
96 }
97 _vm_op_name = nullptr;
98 }
99
100 //------------------------------------------------------------------------------------------------------------------
101 // Implementation of VMThread stuff
102
103 static VM_SafepointALot safepointALot_op;
104 static VM_ForceSafepoint no_op;
105
106 bool VMThread::_should_terminate = false;
107 bool VMThread::_terminated = false;
108 Monitor* VMThread::_terminate_lock = nullptr;
109 VMThread* VMThread::_vm_thread = nullptr;
110 VM_Operation* VMThread::_cur_vm_operation = nullptr;
111 VM_Operation* VMThread::_next_vm_operation = &no_op; // Prevent any thread from setting an operation until VM thread is ready.
112 PerfCounter* VMThread::_perf_accumulated_vm_operation_time = nullptr;
113 VMOperationTimeoutTask* VMThread::_timeout_task = nullptr;
114
115
116 void VMThread::create() {
117 assert(vm_thread() == nullptr, "we can only allocate one VMThread");
118 _vm_thread = new VMThread();
119
120 if (AbortVMOnVMOperationTimeout) {
121 // Make sure we call the timeout task frequently enough, but not too frequent.
122 // Try to make the interval 10% of the timeout delay, so that we miss the timeout
123 // by those 10% at max. Periodic task also expects it to fit min/max intervals.
124 size_t interval = (size_t)AbortVMOnVMOperationTimeoutDelay / 10;
125 interval = interval / PeriodicTask::interval_gran * PeriodicTask::interval_gran;
126 interval = MAX2<size_t>(interval, PeriodicTask::min_interval);
127 interval = MIN2<size_t>(interval, PeriodicTask::max_interval);
128
129 _timeout_task = new VMOperationTimeoutTask(interval);
130 _timeout_task->enroll();
131 } else {
132 assert(_timeout_task == nullptr, "sanity");
133 }
134
135 _terminate_lock = new Monitor(Mutex::nosafepoint, "VMThreadTerminate_lock");
136
137 if (UsePerfData) {
138 // jvmstat performance counters
139 JavaThread* THREAD = JavaThread::current(); // For exception macros.
140 _perf_accumulated_vm_operation_time =
141 PerfDataManager::create_counter(SUN_THREADS, "vmOperationTime",
142 PerfData::U_Ticks, CHECK);
143 CPUTimeCounters::create_counter(CPUTimeGroups::CPUTimeType::vm);
144 }
145 }
146
147 VMThread::VMThread() : NamedThread(), _is_running(false) {
148 set_name("VM Thread");
149 }
150
151 void VMThread::destroy() {
152 _vm_thread = nullptr; // VM thread is gone
153 }
154
155 static VM_Halt halt_op;
156
157 void VMThread::run() {
158 assert(this == vm_thread(), "check");
159
160 // Notify_lock wait checks on is_running() to rewait in
161 // case of spurious wakeup, it should wait on the last
162 // value set prior to the notify
163 Atomic::store(&_is_running, true);
164
165 {
166 MutexLocker ml(Notify_lock);
167 Notify_lock->notify();
168 }
169 // Notify_lock is destroyed by Threads::create_vm()
170
171 int prio = (VMThreadPriority == -1)
172 ? os::java_to_os_priority[NearMaxPriority]
173 : VMThreadPriority;
174 // Note that I cannot call os::set_priority because it expects Java
175 // priorities and I am *explicitly* using OS priorities so that it's
176 // possible to set the VM thread priority higher than any Java thread.
177 os::set_native_priority( this, prio );
178
179 // Wait for VM_Operations until termination
180 this->loop();
181
182 // Note the intention to exit before safepointing.
183 // 6295565 This has the effect of waiting for any large tty
184 // outputs to finish.
185 if (xtty != nullptr) {
186 ttyLocker ttyl;
187 xtty->begin_elem("destroy_vm");
188 xtty->stamp();
189 xtty->end_elem();
190 assert(should_terminate(), "termination flag must be set");
191 }
192
193 // 4526887 let VM thread exit at Safepoint
194 _cur_vm_operation = &halt_op;
195 SafepointSynchronize::begin();
196
197 if (VerifyBeforeExit) {
198 HandleMark hm(VMThread::vm_thread());
199 // Among other things, this ensures that Eden top is correct.
200 Universe::heap()->prepare_for_verify();
201 // Silent verification so as not to pollute normal output,
202 // unless we really asked for it.
203 Universe::verify();
204 }
205
206 CompileBroker::set_should_block();
207
208 // wait for threads (compiler threads or daemon threads) in the
209 // _thread_in_native state to block.
210 VM_Exit::wait_for_threads_in_native_to_block();
211
212 // The ObjectMonitor subsystem uses perf counters so do this before
213 // we signal that the VM thread is gone. We don't want to run afoul
214 // of perfMemory_exit() in exit_globals().
215 ObjectSynchronizer::do_final_audit_and_print_stats();
216
217 // signal other threads that VM process is gone
218 {
219 // Note: we must have the _no_safepoint_check_flag. Mutex::lock() allows
220 // VM thread to enter any lock at Safepoint as long as its _owner is null.
221 // If that happens after _terminate_lock->wait() has unset _owner
222 // but before it actually drops the lock and waits, the notification below
223 // may get lost and we will have a hang. To avoid this, we need to use
224 // Mutex::lock_without_safepoint_check().
225 MonitorLocker ml(_terminate_lock, Mutex::_no_safepoint_check_flag);
226 _terminated = true;
227 ml.notify();
228 }
229
230 // We are now racing with the VM termination being carried out in
231 // another thread, so we don't "delete this". Numerous threads don't
232 // get deleted when the VM terminates
233
234 }
235
236
237 // Notify the VMThread that the last non-daemon JavaThread has terminated,
238 // and wait until operation is performed.
239 void VMThread::wait_for_vm_thread_exit() {
240 assert(JavaThread::current()->is_terminated(), "Should be terminated");
241 {
242 MonitorLocker mu(VMOperation_lock);
243 _should_terminate = true;
244 mu.notify_all();
245 }
246
247 // Note: VM thread leaves at Safepoint. We are not stopped by Safepoint
248 // because this thread has been removed from the threads list. But anything
249 // that could get blocked by Safepoint should not be used after this point,
250 // otherwise we will hang, since there is no one can end the safepoint.
251
252 // Wait until VM thread is terminated
253 // Note: it should be OK to use Terminator_lock here. But this is called
254 // at a very delicate time (VM shutdown) and we are operating in non- VM
255 // thread at Safepoint. It's safer to not share lock with other threads.
256 {
257 MonitorLocker ml(_terminate_lock, Mutex::_no_safepoint_check_flag);
258 while (!VMThread::is_terminated()) {
259 ml.wait();
260 }
261 }
262 }
263
264 static void post_vm_operation_event(EventExecuteVMOperation* event, VM_Operation* op) {
265 assert(event != nullptr, "invariant");
266 assert(op != nullptr, "invariant");
267 const bool evaluate_at_safepoint = op->evaluate_at_safepoint();
268 event->set_operation(op->type());
269 event->set_safepoint(evaluate_at_safepoint);
270 event->set_blocking(true);
271 event->set_caller(JFR_THREAD_ID(op->calling_thread()));
272 event->set_safepointId(evaluate_at_safepoint ? SafepointSynchronize::safepoint_id() : 0);
273 event->commit();
274 }
275
276 void VMThread::evaluate_operation(VM_Operation* op) {
277 ResourceMark rm;
278
279 {
280 PerfTraceElapsedTime vm_op_timer(perf_accumulated_vm_operation_time());
281 HOTSPOT_VMOPS_BEGIN(
282 (char*) op->name(), strlen(op->name()),
283 op->evaluate_at_safepoint() ? 0 : 1);
284
285 EventExecuteVMOperation event;
286 VMThreadCPUTimeScope CPUTimeScope(this, op->is_gc_operation());
287 op->evaluate();
288 if (event.should_commit()) {
289 post_vm_operation_event(&event, op);
290 }
291
292 HOTSPOT_VMOPS_END(
293 (char*) op->name(), strlen(op->name()),
294 op->evaluate_at_safepoint() ? 0 : 1);
295 }
296 }
297
298 class ALotOfHandshakeClosure : public HandshakeClosure {
299 public:
300 ALotOfHandshakeClosure() : HandshakeClosure("ALotOfHandshakeClosure") {}
301 void do_thread(Thread* thread) {
302 #ifdef ASSERT
303 JavaThread::cast(thread)->verify_states_for_handshake();
304 #endif
305 }
306 };
307
308 bool VMThread::handshake_or_safepoint_alot() {
309 assert(_cur_vm_operation == nullptr, "should not have an op yet");
310 assert(_next_vm_operation == nullptr, "should not have an op yet");
311 if (!HandshakeALot && !SafepointALot) {
312 return false;
313 }
314 static jlong last_alot_ms = 0;
315 jlong now_ms = nanos_to_millis(os::javaTimeNanos());
316 // If HandshakeALot or SafepointALot are set, but GuaranteedSafepointInterval is explicitly
317 // set to 0 on the command line, we emit the operation if it's been more than a second
318 // since the last one.
319 jlong interval = GuaranteedSafepointInterval != 0 ? GuaranteedSafepointInterval : 1000;
320 jlong deadline_ms = interval + last_alot_ms;
321 if (now_ms > deadline_ms) {
322 last_alot_ms = now_ms;
323 return true;
324 }
325 return false;
326 }
327
328 bool VMThread::set_next_operation(VM_Operation *op) {
329 if (_next_vm_operation != nullptr) {
330 return false;
331 }
332 log_debug(vmthread)("Adding VM operation: %s", op->name());
333
334 _next_vm_operation = op;
335
336 HOTSPOT_VMOPS_REQUEST(
337 (char *) op->name(), strlen(op->name()),
338 op->evaluate_at_safepoint() ? 0 : 1);
339 return true;
340 }
341
342 void VMThread::wait_until_executed(VM_Operation* op) {
343 MonitorLocker ml(VMOperation_lock,
344 Thread::current()->is_Java_thread() ?
345 Mutex::_safepoint_check_flag :
346 Mutex::_no_safepoint_check_flag);
347 {
348 TraceTime timer("Installing VM operation", TRACETIME_LOG(Trace, vmthread));
349 while (true) {
350 if (VMThread::vm_thread()->set_next_operation(op)) {
351 ml.notify_all();
352 break;
353 }
354 // Wait to install this operation as the next operation in the VM Thread
355 log_trace(vmthread)("A VM operation already set, waiting");
356 ml.wait();
357 }
358 }
359 {
360 // Wait until the operation has been processed
361 TraceTime timer("Waiting for VM operation to be completed", TRACETIME_LOG(Trace, vmthread));
362 // _next_vm_operation is cleared holding VMOperation_lock after it has been
363 // executed. We wait until _next_vm_operation is not our op.
364 while (_next_vm_operation == op) {
365 // VM Thread can process it once we unlock the mutex on wait.
366 ml.wait();
367 }
368 }
369 }
370
371 static void self_destruct_if_needed() {
372 // Support for self destruction
373 if ((SelfDestructTimer != 0.0) && !VMError::is_error_reported() &&
374 (os::elapsedTime() > SelfDestructTimer * 60.0)) {
375 tty->print_cr("VM self-destructed");
376 os::exit(-1);
377 }
378 }
379
380 void VMThread::inner_execute(VM_Operation* op) {
381 assert(Thread::current()->is_VM_thread(), "Must be the VM thread");
382
383 VM_Operation* prev_vm_operation = nullptr;
384 if (_cur_vm_operation != nullptr) {
385 // Check that the VM operation allows nested VM operation.
386 // This is normally not the case, e.g., the compiler
387 // does not allow nested scavenges or compiles.
388 if (!_cur_vm_operation->allow_nested_vm_operations()) {
389 fatal("Unexpected nested VM operation %s requested by operation %s",
390 op->name(), _cur_vm_operation->name());
391 }
392 op->set_calling_thread(_cur_vm_operation->calling_thread());
393 prev_vm_operation = _cur_vm_operation;
394 }
395
396 _cur_vm_operation = op;
397
398 HandleMark hm(VMThread::vm_thread());
399
400 const char* const cause = op->cause();
401 stringStream ss;
402 ss.print("Executing%s%s VM operation: %s",
403 prev_vm_operation != nullptr ? " nested" : "",
404 op->evaluate_at_safepoint() ? " safepoint" : " non-safepoint",
405 op->name());
406 if (cause != nullptr) {
407 ss.print(" (%s)", cause);
408 }
409
410 EventMarkVMOperation em("%s", ss.freeze());
411 log_debug(vmthread)("%s", ss.freeze());
412
413 bool end_safepoint = false;
414 bool has_timeout_task = (_timeout_task != nullptr);
415 if (_cur_vm_operation->evaluate_at_safepoint() &&
416 !SafepointSynchronize::is_at_safepoint()) {
417 SafepointSynchronize::begin();
418 if (has_timeout_task) {
419 _timeout_task->arm(_cur_vm_operation->name());
420 }
421 end_safepoint = true;
422 }
423
424 evaluate_operation(_cur_vm_operation);
425
426 if (end_safepoint) {
427 if (has_timeout_task) {
428 _timeout_task->disarm();
429 }
430 SafepointSynchronize::end();
431 }
432
433 _cur_vm_operation = prev_vm_operation;
434 }
435
436 void VMThread::wait_for_operation() {
437 assert(Thread::current()->is_VM_thread(), "Must be the VM thread");
438 MonitorLocker ml_op_lock(VMOperation_lock, Mutex::_no_safepoint_check_flag);
439
440 // Clear previous operation.
441 // On first call this clears a dummy place-holder.
442 _next_vm_operation = nullptr;
443 // Notify operation is done and notify a next operation can be installed.
444 ml_op_lock.notify_all();
445
446 while (!should_terminate()) {
447 self_destruct_if_needed();
448 if (_next_vm_operation != nullptr) {
449 return;
450 }
451 if (handshake_or_safepoint_alot()) {
452 if (HandshakeALot) {
453 MutexUnlocker mul(VMOperation_lock);
454 ALotOfHandshakeClosure aohc;
455 Handshake::execute(&aohc);
456 }
457 // When we unlocked above someone might have setup a new op.
458 if (_next_vm_operation != nullptr) {
459 return;
460 }
461 if (SafepointALot) {
462 _next_vm_operation = &safepointALot_op;
463 return;
464 }
465 }
466 assert(_next_vm_operation == nullptr, "Must be");
467 assert(_cur_vm_operation == nullptr, "Must be");
468
469 // We didn't find anything to execute, notify any waiter so they can install an op.
470 ml_op_lock.notify_all();
471 ml_op_lock.wait(GuaranteedSafepointInterval);
472 }
473 }
474
475 void VMThread::loop() {
476 assert(_cur_vm_operation == nullptr, "no current one should be executing");
477
478 SafepointSynchronize::init(_vm_thread);
479
480 // Need to set a calling thread for ops not passed
481 // via the normal way.
482 no_op.set_calling_thread(_vm_thread);
483 safepointALot_op.set_calling_thread(_vm_thread);
484
485 while (true) {
486 if (should_terminate()) break;
487 wait_for_operation();
488 if (should_terminate()) break;
489 assert(_next_vm_operation != nullptr, "Must have one");
490 inner_execute(_next_vm_operation);
491 }
492 }
493
494 // A SkipGCALot object is used to elide the usual effect of gc-a-lot
495 // over a section of execution by a thread. Currently, it's used only to
496 // prevent re-entrant calls to GC.
497 class SkipGCALot : public StackObj {
498 private:
499 bool _saved;
500 Thread* _t;
501
502 public:
503 #ifdef ASSERT
504 SkipGCALot(Thread* t) : _t(t) {
505 _saved = _t->skip_gcalot();
506 _t->set_skip_gcalot(true);
507 }
508
509 ~SkipGCALot() {
510 assert(_t->skip_gcalot(), "Save-restore protocol invariant");
511 _t->set_skip_gcalot(_saved);
512 }
513 #else
514 SkipGCALot(Thread* t) { }
515 ~SkipGCALot() { }
516 #endif
517 };
518
519 void VMThread::execute(VM_Operation* op) {
520 Thread* t = Thread::current();
521
522 PerfTraceTimedEvent p(VMThread::get_perf_timer_for(op), VMThread::get_perf_counter_for(op), \
523 Thread::current()->profile_vm_ops()); \
524
525 if (t->is_VM_thread()) {
526 op->set_calling_thread(t);
527 ((VMThread*)t)->inner_execute(op);
528 return;
529 }
530
531 // The current thread must not belong to the SuspendibleThreadSet, because an
532 // on-the-fly safepoint can be waiting for the current thread, and the
533 // current thread will be blocked in wait_until_executed, resulting in
534 // deadlock.
535 assert(!t->is_suspendible_thread(), "precondition");
536 assert(!t->is_indirectly_suspendible_thread(), "precondition");
537
538 // Avoid re-entrant attempts to gc-a-lot
539 SkipGCALot sgcalot(t);
540
541 // JavaThread or WatcherThread
542 if (t->is_Java_thread()) {
543 JavaThread::cast(t)->check_for_valid_safepoint_state();
544 }
545
546 // New request from Java thread, evaluate prologue
547 if (!op->doit_prologue()) {
548 return; // op was cancelled
549 }
550
551 op->set_calling_thread(t);
552
553 wait_until_executed(op);
554
555 op->doit_epilogue();
556 }
557
558 void VMThread::verify() {
559 oops_do(&VerifyOopClosure::verify_oop, nullptr);
560 }
561
562 #define DECLARE_COUNTER(name) \
563 PerfTickCounters* _perf_##name##_timer = nullptr; \
564 PerfCounter* _perf_##name##_count = nullptr;
565
566 VM_OPS_DO(DECLARE_COUNTER)
567
568 #undef DECLARE_COUNTER
569
570 #define SWITCH_TIMER(name) \
571 case VM_Operation::VMOp_##name: return _perf_##name##_timer;
572
573 PerfTickCounters* VMThread::get_perf_timer_for(VM_Operation *op) {
574 switch(op->type()) {
575 VM_OPS_DO(SWITCH_TIMER)
576 default: ShouldNotReachHere();
577 }
578 }
579
580 #undef SWITCH_TIMER
581
582 #define SWITCH_COUNT(name) \
583 case VM_Operation::VMOp_##name: return _perf_##name##_count;
584
585 PerfCounter* VMThread::get_perf_counter_for(VM_Operation *op) {
586 switch(op->type()) {
587 VM_OPS_DO(SWITCH_COUNT)
588 default: ShouldNotReachHere();
589 }
590 }
591
592 #undef SWITCH_COUNT
593
594 #define INIT_COUNTER(name) \
595 NEWPERFTICKCOUNTERS(_perf_##name##_timer, SUN_RT, #name "_time"); \
596 NEWPERFEVENTCOUNTER(_perf_##name##_count, SUN_RT, #name "_count"); \
597
598 void VMThread::init_counters() {
599 if (ProfileVMOps && UsePerfData) {
600 EXCEPTION_MARK;
601
602 VM_OPS_DO(INIT_COUNTER)
603
604 if (HAS_PENDING_EXCEPTION) {
605 vm_exit_during_initialization("jvm_perf_init failed unexpectedly");
606 }
607 }
608 }
609
610 #undef INIT_COUNTER
611
612 static jlong total_count() {
613 jlong total = 0;
614 #define ACC_COUNT(name) total += _perf_##name##_count->get_value();
615 VM_OPS_DO(ACC_COUNT)
616 #undef ACC_COUNT
617 return total;
618 }
619
620 static jlong total_elapsed_time_in_ms() {
621 jlong total_elapsed_ticks = 0;
622 #define ACC_COUNT(name) total_elapsed_ticks += _perf_##name##_timer->elapsed_counter_value();
623 VM_OPS_DO(ACC_COUNT)
624 #undef ACC_COUNT
625 return Management::ticks_to_ms(total_elapsed_ticks);
626 }
627
628 #define PRINT_COUNTER(name) {\
629 jlong count = _perf_##name##_count->get_value(); \
630 if (count > 0) { \
631 st->print_cr(" %-40s = " JLONG_FORMAT_W(6) "us (" JLONG_FORMAT_W(5) " events)", #name, _perf_##name##_timer->elapsed_counter_value_us(), count); \
632 }}
633
634 void VMThread::print_counters_on(outputStream* st) {
635 if (ProfileVMOps && UsePerfData) {
636 st->print_cr("VMOperation: Total: " JLONG_FORMAT " events (elapsed " JLONG_FORMAT "ms) for thread \"main\":",
637 total_count(), total_elapsed_time_in_ms());
638 VM_OPS_DO(PRINT_COUNTER)
639 } else {
640 st->print_cr(" VMOperations: no info (%s is disabled)", (UsePerfData ? "ProfileVMCalls" : "UsePerfData"));
641 }
642 }
643
644 #undef PRINT_COUNTER