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comparison src/share/vm/runtime/safepoint.cpp @ 1783:d5d065957597

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6953144: Tiered compilation Summary: Infrastructure for tiered compilation support (interpreter + c1 + c2) for 32 and 64 bit. Simple tiered policy implementation. Reviewed-by: kvn, never, phh, twisti
author iveresov
date Fri, 03 Sep 2010 17:51:07 -0700
parents da877bdc9000
children ce6848d0666d
comparison
equal deleted inserted replaced
1782:f353275af40e 1783:d5d065957597
428 // Need a safepoint if some inline cache buffers is non-empty 428 // Need a safepoint if some inline cache buffers is non-empty
429 if (!InlineCacheBuffer::is_empty()) return true; 429 if (!InlineCacheBuffer::is_empty()) return true;
430 return false; 430 return false;
431 } 431 }
432 432
433 jlong CounterDecay::_last_timestamp = 0; 433
434
435 static void do_method(methodOop m) {
436 m->invocation_counter()->decay();
437 }
438
439 void CounterDecay::decay() {
440 _last_timestamp = os::javaTimeMillis();
441
442 // This operation is going to be performed only at the end of a safepoint
443 // and hence GC's will not be going on, all Java mutators are suspended
444 // at this point and hence SystemDictionary_lock is also not needed.
445 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint");
446 int nclasses = SystemDictionary::number_of_classes();
447 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 /
448 CounterHalfLifeTime);
449 for (int i = 0; i < classes_per_tick; i++) {
450 klassOop k = SystemDictionary::try_get_next_class();
451 if (k != NULL && k->klass_part()->oop_is_instance()) {
452 instanceKlass::cast(k)->methods_do(do_method);
453 }
454 }
455 }
456 434
457 // Various cleaning tasks that should be done periodically at safepoints 435 // Various cleaning tasks that should be done periodically at safepoints
458 void SafepointSynchronize::do_cleanup_tasks() { 436 void SafepointSynchronize::do_cleanup_tasks() {
459 { 437 {
460 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime); 438 TraceTime t1("deflating idle monitors", TraceSafepointCleanupTime);
463 441
464 { 442 {
465 TraceTime t2("updating inline caches", TraceSafepointCleanupTime); 443 TraceTime t2("updating inline caches", TraceSafepointCleanupTime);
466 InlineCacheBuffer::update_inline_caches(); 444 InlineCacheBuffer::update_inline_caches();
467 } 445 }
468 446 {
469 if(UseCounterDecay && CounterDecay::is_decay_needed()) { 447 TraceTime t3("compilation policy safepoint handler", TraceSafepointCleanupTime);
470 TraceTime t3("decaying counter", TraceSafepointCleanupTime); 448 CompilationPolicy::policy()->do_safepoint_work();
471 CounterDecay::decay();
472 } 449 }
473 450
474 TraceTime t4("sweeping nmethods", TraceSafepointCleanupTime); 451 TraceTime t4("sweeping nmethods", TraceSafepointCleanupTime);
475 NMethodSweeper::scan_stacks(); 452 NMethodSweeper::scan_stacks();
476 } 453 }