6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "memory/allocation.inline.hpp"
27 #include "memory/cardTableModRefBS.inline.hpp"
28 #include "memory/cardTableRS.hpp"
29 #include "memory/genCollectedHeap.hpp"
30 #include "memory/sharedHeap.hpp"
31 #include "memory/space.hpp"
32 #include "memory/space.inline.hpp"
33 #include "memory/universe.hpp"
34 #include "runtime/java.hpp"
35 #include "runtime/mutexLocker.hpp"
36 #include "runtime/virtualspace.hpp"
37 #include "services/memTracker.hpp"
38 #include "utilities/macros.hpp"
39 #ifdef COMPILER1
40 #include "c1/c1_LIR.hpp"
41 #include "c1/c1_LIRGenerator.hpp"
42 #endif
43
44 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and
45 // enumerate ref fields that have been modified (since the last
46 // enumeration.)
47
48 size_t CardTableModRefBS::compute_byte_map_size()
49 {
50 assert(_guard_index == cards_required(_whole_heap.word_size()) - 1,
434
435 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal, bool release) {
436 inline_write_ref_field(field, newVal, release);
437 }
438
439
440 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp,
441 MemRegion mr,
442 OopsInGenClosure* cl,
443 CardTableRS* ct) {
444 if (!mr.is_empty()) {
445 // Caller (process_roots()) claims that all GC threads
446 // execute this call. With UseDynamicNumberOfGCThreads now all
447 // active GC threads execute this call. The number of active GC
448 // threads needs to be passed to par_non_clean_card_iterate_work()
449 // to get proper partitioning and termination.
450 //
451 // This is an example of where n_par_threads() is used instead
452 // of workers()->active_workers(). n_par_threads can be set to 0 to
453 // turn off parallelism. For example when this code is called as
454 // part of verification and SharedHeap::process_roots() is being
455 // used, then n_par_threads() may have been set to 0. active_workers
456 // is not overloaded with the meaning that it is a switch to disable
457 // parallelism and so keeps the meaning of the number of
458 // active gc workers. If parallelism has not been shut off by
459 // setting n_par_threads to 0, then n_par_threads should be
460 // equal to active_workers. When a different mechanism for shutting
461 // off parallelism is used, then active_workers can be used in
462 // place of n_par_threads.
463 int n_threads = GenCollectedHeap::heap()->n_par_threads();
464 bool is_par = n_threads > 0;
465 if (is_par) {
466 #if INCLUDE_ALL_GCS
467 assert(GenCollectedHeap::heap()->n_par_threads() ==
468 GenCollectedHeap::heap()->workers()->active_workers(), "Mismatch");
469 non_clean_card_iterate_parallel_work(sp, mr, cl, ct, n_threads);
470 #else // INCLUDE_ALL_GCS
471 fatal("Parallel gc not supported here.");
472 #endif // INCLUDE_ALL_GCS
473 } else {
474 // clear_cl finds contiguous dirty ranges of cards to process and clear.
475
476 DirtyCardToOopClosure* dcto_cl = sp->new_dcto_cl(cl, precision(), cl->gen_boundary());
477 ClearNoncleanCardWrapper clear_cl(dcto_cl, ct);
478
479 clear_cl.do_MemRegion(mr);
480 }
481 }
|
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc_interface/collectedHeap.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "memory/cardTableModRefBS.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/genCollectedHeap.hpp"
31 #include "memory/space.hpp"
32 #include "memory/space.inline.hpp"
33 #include "memory/universe.hpp"
34 #include "runtime/java.hpp"
35 #include "runtime/mutexLocker.hpp"
36 #include "runtime/virtualspace.hpp"
37 #include "services/memTracker.hpp"
38 #include "utilities/macros.hpp"
39 #ifdef COMPILER1
40 #include "c1/c1_LIR.hpp"
41 #include "c1/c1_LIRGenerator.hpp"
42 #endif
43
44 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and
45 // enumerate ref fields that have been modified (since the last
46 // enumeration.)
47
48 size_t CardTableModRefBS::compute_byte_map_size()
49 {
50 assert(_guard_index == cards_required(_whole_heap.word_size()) - 1,
434
435 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal, bool release) {
436 inline_write_ref_field(field, newVal, release);
437 }
438
439
440 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp,
441 MemRegion mr,
442 OopsInGenClosure* cl,
443 CardTableRS* ct) {
444 if (!mr.is_empty()) {
445 // Caller (process_roots()) claims that all GC threads
446 // execute this call. With UseDynamicNumberOfGCThreads now all
447 // active GC threads execute this call. The number of active GC
448 // threads needs to be passed to par_non_clean_card_iterate_work()
449 // to get proper partitioning and termination.
450 //
451 // This is an example of where n_par_threads() is used instead
452 // of workers()->active_workers(). n_par_threads can be set to 0 to
453 // turn off parallelism. For example when this code is called as
454 // part of verification during root processing then n_par_threads()
455 // may have been set to 0. active_workers is not overloaded with
456 // the meaning that it is a switch to disable parallelism and so keeps
457 // the meaning of the number of active gc workers. If parallelism has
458 // not been shut off by setting n_par_threads to 0, then n_par_threads
459 // should be equal to active_workers. When a different mechanism for
460 // shutting off parallelism is used, then active_workers can be used in
461 // place of n_par_threads.
462 int n_threads = GenCollectedHeap::heap()->n_par_threads();
463 bool is_par = n_threads > 0;
464 if (is_par) {
465 #if INCLUDE_ALL_GCS
466 assert(GenCollectedHeap::heap()->n_par_threads() ==
467 GenCollectedHeap::heap()->workers()->active_workers(), "Mismatch");
468 non_clean_card_iterate_parallel_work(sp, mr, cl, ct, n_threads);
469 #else // INCLUDE_ALL_GCS
470 fatal("Parallel gc not supported here.");
471 #endif // INCLUDE_ALL_GCS
472 } else {
473 // clear_cl finds contiguous dirty ranges of cards to process and clear.
474
475 DirtyCardToOopClosure* dcto_cl = sp->new_dcto_cl(cl, precision(), cl->gen_boundary());
476 ClearNoncleanCardWrapper clear_cl(dcto_cl, ct);
477
478 clear_cl.do_MemRegion(mr);
479 }
480 }
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