462 _eden_chunk_capacity(0), // -- ditto --
463 _eden_chunk_index(0), // -- ditto --
464 _survivor_plab_array(NULL), // -- ditto --
465 _survivor_chunk_array(NULL), // -- ditto --
466 _survivor_chunk_capacity(0), // -- ditto --
467 _survivor_chunk_index(0), // -- ditto --
468 _ser_pmc_preclean_ovflw(0),
469 _ser_kac_preclean_ovflw(0),
470 _ser_pmc_remark_ovflw(0),
471 _par_pmc_remark_ovflw(0),
472 _ser_kac_ovflw(0),
473 _par_kac_ovflw(0),
474 #ifndef PRODUCT
475 _num_par_pushes(0),
476 #endif
477 _collection_count_start(0),
478 _verifying(false),
479 _verification_mark_bm(0, Mutex::leaf + 1, "CMS_verification_mark_bm_lock"),
480 _completed_initialization(false),
481 _collector_policy(cp),
482 _should_unload_classes(CMSClassUnloadingEnabled),
483 _concurrent_cycles_since_last_unload(0),
484 _roots_scanning_options(GenCollectedHeap::SO_None),
485 _inter_sweep_estimate(CMS_SweepWeight, CMS_SweepPadding),
486 _intra_sweep_estimate(CMS_SweepWeight, CMS_SweepPadding),
487 _gc_tracer_cm(new (ResourceObj::C_HEAP, mtGC) CMSTracer()),
488 _gc_timer_cm(new (ResourceObj::C_HEAP, mtGC) ConcurrentGCTimer()),
489 _cms_start_registered(false)
490 {
491 if (ExplicitGCInvokesConcurrentAndUnloadsClasses) {
492 ExplicitGCInvokesConcurrent = true;
493 }
494 // Now expand the span and allocate the collection support structures
495 // (MUT, marking bit map etc.) to cover both generations subject to
496 // collection.
497
498 // For use by dirty card to oop closures.
499 _cmsGen->cmsSpace()->set_collector(this);
500
501 // Allocate MUT and marking bit map
502 {
2545 // unload classes if it's the case that:
2546 // (1) an explicit gc request has been made and the flag
2547 // ExplicitGCInvokesConcurrentAndUnloadsClasses is set, OR
2548 // (2) (a) class unloading is enabled at the command line, and
2549 // (b) old gen is getting really full
2550 // NOTE: Provided there is no change in the state of the heap between
2551 // calls to this method, it should have idempotent results. Moreover,
2552 // its results should be monotonically increasing (i.e. going from 0 to 1,
2553 // but not 1 to 0) between successive calls between which the heap was
2554 // not collected. For the implementation below, it must thus rely on
2555 // the property that concurrent_cycles_since_last_unload()
2556 // will not decrease unless a collection cycle happened and that
2557 // _cmsGen->is_too_full() are
2558 // themselves also monotonic in that sense. See check_monotonicity()
2559 // below.
2560 void CMSCollector::update_should_unload_classes() {
2561 _should_unload_classes = false;
2562 // Condition 1 above
2563 if (_full_gc_requested && ExplicitGCInvokesConcurrentAndUnloadsClasses) {
2564 _should_unload_classes = true;
2565 } else if (CMSClassUnloadingEnabled) { // Condition 2.a above
2566 // Disjuncts 2.b.(i,ii,iii) above
2567 _should_unload_classes = (concurrent_cycles_since_last_unload() >=
2568 CMSClassUnloadingMaxInterval)
2569 || _cmsGen->is_too_full();
2570 }
2571 }
2572
2573 bool ConcurrentMarkSweepGeneration::is_too_full() const {
2574 bool res = should_concurrent_collect();
2575 res = res && (occupancy() > (double)CMSIsTooFullPercentage/100.0);
2576 return res;
2577 }
2578
2579 void CMSCollector::setup_cms_unloading_and_verification_state() {
2580 const bool should_verify = VerifyBeforeGC || VerifyAfterGC || VerifyDuringGC
2581 || VerifyBeforeExit;
2582 const int rso = GenCollectedHeap::SO_AllCodeCache;
2583
2584 // We set the proper root for this CMS cycle here.
2585 if (should_unload_classes()) { // Should unload classes this cycle
|
462 _eden_chunk_capacity(0), // -- ditto --
463 _eden_chunk_index(0), // -- ditto --
464 _survivor_plab_array(NULL), // -- ditto --
465 _survivor_chunk_array(NULL), // -- ditto --
466 _survivor_chunk_capacity(0), // -- ditto --
467 _survivor_chunk_index(0), // -- ditto --
468 _ser_pmc_preclean_ovflw(0),
469 _ser_kac_preclean_ovflw(0),
470 _ser_pmc_remark_ovflw(0),
471 _par_pmc_remark_ovflw(0),
472 _ser_kac_ovflw(0),
473 _par_kac_ovflw(0),
474 #ifndef PRODUCT
475 _num_par_pushes(0),
476 #endif
477 _collection_count_start(0),
478 _verifying(false),
479 _verification_mark_bm(0, Mutex::leaf + 1, "CMS_verification_mark_bm_lock"),
480 _completed_initialization(false),
481 _collector_policy(cp),
482 _should_unload_classes(ClassUnloadingWithConcurrentMark),
483 _concurrent_cycles_since_last_unload(0),
484 _roots_scanning_options(GenCollectedHeap::SO_None),
485 _inter_sweep_estimate(CMS_SweepWeight, CMS_SweepPadding),
486 _intra_sweep_estimate(CMS_SweepWeight, CMS_SweepPadding),
487 _gc_tracer_cm(new (ResourceObj::C_HEAP, mtGC) CMSTracer()),
488 _gc_timer_cm(new (ResourceObj::C_HEAP, mtGC) ConcurrentGCTimer()),
489 _cms_start_registered(false)
490 {
491 if (ExplicitGCInvokesConcurrentAndUnloadsClasses) {
492 ExplicitGCInvokesConcurrent = true;
493 }
494 // Now expand the span and allocate the collection support structures
495 // (MUT, marking bit map etc.) to cover both generations subject to
496 // collection.
497
498 // For use by dirty card to oop closures.
499 _cmsGen->cmsSpace()->set_collector(this);
500
501 // Allocate MUT and marking bit map
502 {
2545 // unload classes if it's the case that:
2546 // (1) an explicit gc request has been made and the flag
2547 // ExplicitGCInvokesConcurrentAndUnloadsClasses is set, OR
2548 // (2) (a) class unloading is enabled at the command line, and
2549 // (b) old gen is getting really full
2550 // NOTE: Provided there is no change in the state of the heap between
2551 // calls to this method, it should have idempotent results. Moreover,
2552 // its results should be monotonically increasing (i.e. going from 0 to 1,
2553 // but not 1 to 0) between successive calls between which the heap was
2554 // not collected. For the implementation below, it must thus rely on
2555 // the property that concurrent_cycles_since_last_unload()
2556 // will not decrease unless a collection cycle happened and that
2557 // _cmsGen->is_too_full() are
2558 // themselves also monotonic in that sense. See check_monotonicity()
2559 // below.
2560 void CMSCollector::update_should_unload_classes() {
2561 _should_unload_classes = false;
2562 // Condition 1 above
2563 if (_full_gc_requested && ExplicitGCInvokesConcurrentAndUnloadsClasses) {
2564 _should_unload_classes = true;
2565 } else if (ClassUnloadingWithConcurrentMark) { // Condition 2.a above
2566 // Disjuncts 2.b.(i,ii,iii) above
2567 _should_unload_classes = (concurrent_cycles_since_last_unload() >=
2568 CMSClassUnloadingMaxInterval)
2569 || _cmsGen->is_too_full();
2570 }
2571 }
2572
2573 bool ConcurrentMarkSweepGeneration::is_too_full() const {
2574 bool res = should_concurrent_collect();
2575 res = res && (occupancy() > (double)CMSIsTooFullPercentage/100.0);
2576 return res;
2577 }
2578
2579 void CMSCollector::setup_cms_unloading_and_verification_state() {
2580 const bool should_verify = VerifyBeforeGC || VerifyAfterGC || VerifyDuringGC
2581 || VerifyBeforeExit;
2582 const int rso = GenCollectedHeap::SO_AllCodeCache;
2583
2584 // We set the proper root for this CMS cycle here.
2585 if (should_unload_classes()) { // Should unload classes this cycle
|