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comparison src/share/vm/services/memTracker.cpp @ 11137:c9a5fab39234

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8012241: NMT huge memory footprint, it usually leads to OOME Summary: Enforce memory limitation on NMT to prevent JVM OOM Reviewed-by: acorn, dcubed, minqi
author zgu
date Thu, 11 Jul 2013 13:15:12 -0400
parents 1f4355cee9a2
children 248c459b2b75
comparison
equal deleted inserted replaced
11101:e79a9f26ba2e 11137:c9a5fab39234
383 */ 383 */
384 #define MAX_SAFEPOINTS_TO_SKIP 128 384 #define MAX_SAFEPOINTS_TO_SKIP 128
385 #define SAFE_SEQUENCE_THRESHOLD 30 385 #define SAFE_SEQUENCE_THRESHOLD 30
386 #define HIGH_GENERATION_THRESHOLD 60 386 #define HIGH_GENERATION_THRESHOLD 60
387 #define MAX_RECORDER_THREAD_RATIO 30 387 #define MAX_RECORDER_THREAD_RATIO 30
388 #define MAX_RECORDER_PER_THREAD 100
388 389
389 void MemTracker::sync() { 390 void MemTracker::sync() {
390 assert(_tracking_level > NMT_off, "NMT is not enabled"); 391 assert(_tracking_level > NMT_off, "NMT is not enabled");
391 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required"); 392 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required");
392 393
435 436
436 // see if NMT has too many outstanding recorder instances, it usually 437 // see if NMT has too many outstanding recorder instances, it usually
437 // means that worker thread is lagging behind in processing them. 438 // means that worker thread is lagging behind in processing them.
438 if (!AutoShutdownNMT) { 439 if (!AutoShutdownNMT) {
439 _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count); 440 _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count);
441 } else {
442 // If auto shutdown is on, enforce MAX_RECORDER_PER_THREAD threshold to prevent OOM
443 if (MemRecorder::_instance_count >= _thread_count * MAX_RECORDER_PER_THREAD) {
444 shutdown(NMT_out_of_memory);
445 }
440 } 446 }
441 447
442 // check _worker_thread with lock to avoid racing condition 448 // check _worker_thread with lock to avoid racing condition
443 if (_worker_thread != NULL) { 449 if (_worker_thread != NULL) {
444 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes()); 450 _worker_thread->at_sync_point(pending_recorders, InstanceKlass::number_of_instance_classes());