412 }
413 // Touch the last card of the covered region to show that it
414 // is committed (or SEGV).
415 debug_only((void) (*byte_for(_covered[ind].last()));)
416 debug_only(verify_guard();)
417 }
418
419 // Note that these versions are precise! The scanning code has to handle the
420 // fact that the write barrier may be either precise or imprecise.
421
422 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal, bool release) {
423 inline_write_ref_field(field, newVal, release);
424 }
425
426
427 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp,
428 MemRegion mr,
429 OopsInGenClosure* cl,
430 CardTableRS* ct) {
431 if (!mr.is_empty()) {
432 // Caller (process_strong_roots()) claims that all GC threads
433 // execute this call. With UseDynamicNumberOfGCThreads now all
434 // active GC threads execute this call. The number of active GC
435 // threads needs to be passed to par_non_clean_card_iterate_work()
436 // to get proper partitioning and termination.
437 //
438 // This is an example of where n_par_threads() is used instead
439 // of workers()->active_workers(). n_par_threads can be set to 0 to
440 // turn off parallelism. For example when this code is called as
441 // part of verification and SharedHeap::process_strong_roots() is being
442 // used, then n_par_threads() may have been set to 0. active_workers
443 // is not overloaded with the meaning that it is a switch to disable
444 // parallelism and so keeps the meaning of the number of
445 // active gc workers. If parallelism has not been shut off by
446 // setting n_par_threads to 0, then n_par_threads should be
447 // equal to active_workers. When a different mechanism for shutting
448 // off parallelism is used, then active_workers can be used in
449 // place of n_par_threads.
450 // This is an example of a path where n_par_threads is
451 // set to 0 to turn off parallelism.
452 // [7] CardTableModRefBS::non_clean_card_iterate()
453 // [8] CardTableRS::younger_refs_in_space_iterate()
454 // [9] Generation::younger_refs_in_space_iterate()
455 // [10] OneContigSpaceCardGeneration::younger_refs_iterate()
456 // [11] CompactingPermGenGen::younger_refs_iterate()
457 // [12] CardTableRS::younger_refs_iterate()
458 // [13] SharedHeap::process_strong_roots()
459 // [14] G1CollectedHeap::verify()
460 // [15] Universe::verify()
461 // [16] G1CollectedHeap::do_collection_pause_at_safepoint()
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412 }
413 // Touch the last card of the covered region to show that it
414 // is committed (or SEGV).
415 debug_only((void) (*byte_for(_covered[ind].last()));)
416 debug_only(verify_guard();)
417 }
418
419 // Note that these versions are precise! The scanning code has to handle the
420 // fact that the write barrier may be either precise or imprecise.
421
422 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal, bool release) {
423 inline_write_ref_field(field, newVal, release);
424 }
425
426
427 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp,
428 MemRegion mr,
429 OopsInGenClosure* cl,
430 CardTableRS* ct) {
431 if (!mr.is_empty()) {
432 // Caller (process_roots()) claims that all GC threads
433 // execute this call. With UseDynamicNumberOfGCThreads now all
434 // active GC threads execute this call. The number of active GC
435 // threads needs to be passed to par_non_clean_card_iterate_work()
436 // to get proper partitioning and termination.
437 //
438 // This is an example of where n_par_threads() is used instead
439 // of workers()->active_workers(). n_par_threads can be set to 0 to
440 // turn off parallelism. For example when this code is called as
441 // part of verification and SharedHeap::process_roots() is being
442 // used, then n_par_threads() may have been set to 0. active_workers
443 // is not overloaded with the meaning that it is a switch to disable
444 // parallelism and so keeps the meaning of the number of
445 // active gc workers. If parallelism has not been shut off by
446 // setting n_par_threads to 0, then n_par_threads should be
447 // equal to active_workers. When a different mechanism for shutting
448 // off parallelism is used, then active_workers can be used in
449 // place of n_par_threads.
450 // This is an example of a path where n_par_threads is
451 // set to 0 to turn off parallelism.
452 // [7] CardTableModRefBS::non_clean_card_iterate()
453 // [8] CardTableRS::younger_refs_in_space_iterate()
454 // [9] Generation::younger_refs_in_space_iterate()
455 // [10] OneContigSpaceCardGeneration::younger_refs_iterate()
456 // [11] CompactingPermGenGen::younger_refs_iterate()
457 // [12] CardTableRS::younger_refs_iterate()
458 // [13] SharedHeap::process_strong_roots()
459 // [14] G1CollectedHeap::verify()
460 // [15] Universe::verify()
461 // [16] G1CollectedHeap::do_collection_pause_at_safepoint()
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