350 void GenCollectedHeap::do_collection(bool full,
351 bool clear_all_soft_refs,
352 size_t size,
353 bool is_tlab,
354 GenerationType max_generation) {
355 ResourceMark rm;
356 DEBUG_ONLY(Thread* my_thread = Thread::current();)
357
358 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
359 assert(my_thread->is_VM_thread() ||
360 my_thread->is_ConcurrentGC_thread(),
361 "incorrect thread type capability");
362 assert(Heap_lock->is_locked(),
363 "the requesting thread should have the Heap_lock");
364 guarantee(!is_gc_active(), "collection is not reentrant");
365
366 if (GCLocker::check_active_before_gc()) {
367 return; // GC is disabled (e.g. JNI GetXXXCritical operation)
368 }
369
370 GCIdMarkAndRestore gc_id_mark;
371
372 const bool do_clear_all_soft_refs = clear_all_soft_refs ||
373 collector_policy()->should_clear_all_soft_refs();
374
375 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy());
376
377 const size_t metadata_prev_used = MetaspaceAux::used_bytes();
378
379 print_heap_before_gc();
380
381 {
382 FlagSetting fl(_is_gc_active, true);
383
384 bool complete = full && (max_generation == OldGen);
385 bool old_collects_young = complete && !ScavengeBeforeFullGC;
386 bool do_young_collection = !old_collects_young && _young_gen->should_collect(full, size, is_tlab);
387
388 FormatBuffer<> gc_string("%s", "Pause ");
389 if (do_young_collection) {
390 gc_string.append("Young");
425 // Allocation request was met by young GC.
426 size = 0;
427 }
428 }
429
430 bool must_restore_marks_for_biased_locking = false;
431
432 if (max_generation == OldGen && _old_gen->should_collect(full, size, is_tlab)) {
433 if (!complete) {
434 // The full_collections increment was missed above.
435 increment_total_full_collections();
436 }
437
438 if (!prepared_for_verification && run_verification &&
439 VerifyGCLevel <= 1 && VerifyBeforeGC) {
440 prepare_for_verify();
441 }
442
443 if (do_young_collection) {
444 // We did a young GC. Need a new GC id for the old GC.
445 GCIdMarkAndRestore gc_id_mark;
446 GCTraceTime(Info, gc) t("Pause Full", NULL, gc_cause(), true);
447 collect_generation(_old_gen, full, size, is_tlab, run_verification && VerifyGCLevel <= 1, do_clear_all_soft_refs, true);
448 } else {
449 // No young GC done. Use the same GC id as was set up earlier in this method.
450 collect_generation(_old_gen, full, size, is_tlab, run_verification && VerifyGCLevel <= 1, do_clear_all_soft_refs, true);
451 }
452
453 must_restore_marks_for_biased_locking = true;
454 collected_old = true;
455 }
456
457 // Update "complete" boolean wrt what actually transpired --
458 // for instance, a promotion failure could have led to
459 // a whole heap collection.
460 complete = complete || collected_old;
461
462 print_heap_change(young_prev_used, old_prev_used);
463 MetaspaceAux::print_metaspace_change(metadata_prev_used);
464
465 // Adjust generation sizes.
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350 void GenCollectedHeap::do_collection(bool full,
351 bool clear_all_soft_refs,
352 size_t size,
353 bool is_tlab,
354 GenerationType max_generation) {
355 ResourceMark rm;
356 DEBUG_ONLY(Thread* my_thread = Thread::current();)
357
358 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
359 assert(my_thread->is_VM_thread() ||
360 my_thread->is_ConcurrentGC_thread(),
361 "incorrect thread type capability");
362 assert(Heap_lock->is_locked(),
363 "the requesting thread should have the Heap_lock");
364 guarantee(!is_gc_active(), "collection is not reentrant");
365
366 if (GCLocker::check_active_before_gc()) {
367 return; // GC is disabled (e.g. JNI GetXXXCritical operation)
368 }
369
370 GCIdMark gc_id_mark;
371
372 const bool do_clear_all_soft_refs = clear_all_soft_refs ||
373 collector_policy()->should_clear_all_soft_refs();
374
375 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy());
376
377 const size_t metadata_prev_used = MetaspaceAux::used_bytes();
378
379 print_heap_before_gc();
380
381 {
382 FlagSetting fl(_is_gc_active, true);
383
384 bool complete = full && (max_generation == OldGen);
385 bool old_collects_young = complete && !ScavengeBeforeFullGC;
386 bool do_young_collection = !old_collects_young && _young_gen->should_collect(full, size, is_tlab);
387
388 FormatBuffer<> gc_string("%s", "Pause ");
389 if (do_young_collection) {
390 gc_string.append("Young");
425 // Allocation request was met by young GC.
426 size = 0;
427 }
428 }
429
430 bool must_restore_marks_for_biased_locking = false;
431
432 if (max_generation == OldGen && _old_gen->should_collect(full, size, is_tlab)) {
433 if (!complete) {
434 // The full_collections increment was missed above.
435 increment_total_full_collections();
436 }
437
438 if (!prepared_for_verification && run_verification &&
439 VerifyGCLevel <= 1 && VerifyBeforeGC) {
440 prepare_for_verify();
441 }
442
443 if (do_young_collection) {
444 // We did a young GC. Need a new GC id for the old GC.
445 GCIdMark gc_id_mark;
446 GCTraceTime(Info, gc) t("Pause Full", NULL, gc_cause(), true);
447 collect_generation(_old_gen, full, size, is_tlab, run_verification && VerifyGCLevel <= 1, do_clear_all_soft_refs, true);
448 } else {
449 // No young GC done. Use the same GC id as was set up earlier in this method.
450 collect_generation(_old_gen, full, size, is_tlab, run_verification && VerifyGCLevel <= 1, do_clear_all_soft_refs, true);
451 }
452
453 must_restore_marks_for_biased_locking = true;
454 collected_old = true;
455 }
456
457 // Update "complete" boolean wrt what actually transpired --
458 // for instance, a promotion failure could have led to
459 // a whole heap collection.
460 complete = complete || collected_old;
461
462 print_heap_change(young_prev_used, old_prev_used);
463 MetaspaceAux::print_metaspace_change(metadata_prev_used);
464
465 // Adjust generation sizes.
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