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/g1/g1CardTable.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/shared/memset_with_concurrent_readers.hpp"
29 #include "logging/log.hpp"
30 #include "runtime/atomic.hpp"
31 #include "runtime/orderAccess.inline.hpp"
32
33 bool G1CardTable::mark_card_deferred(size_t card_index) {
34 jbyte val = _byte_map[card_index];
35 // It's already processed
36 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) {
37 return false;
38 }
39
40 // Cached bit can be installed either on a clean card or on a claimed card.
41 jbyte new_val = val;
42 if (val == clean_card_val()) {
43 new_val = (jbyte)deferred_card_val();
44 } else {
45 if (val & claimed_card_val()) {
46 new_val = val | (jbyte)deferred_card_val();
47 }
48 }
49 if (new_val != val) {
50 Atomic::cmpxchg(new_val, &_byte_map[card_index], val);
51 }
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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/g1/g1CardTable.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/shared/memset_with_concurrent_readers.hpp"
29 #include "logging/log.hpp"
30 #include "runtime/atomic.hpp"
31 #include "runtime/orderAccess.hpp"
32
33 bool G1CardTable::mark_card_deferred(size_t card_index) {
34 jbyte val = _byte_map[card_index];
35 // It's already processed
36 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) {
37 return false;
38 }
39
40 // Cached bit can be installed either on a clean card or on a claimed card.
41 jbyte new_val = val;
42 if (val == clean_card_val()) {
43 new_val = (jbyte)deferred_card_val();
44 } else {
45 if (val & claimed_card_val()) {
46 new_val = val | (jbyte)deferred_card_val();
47 }
48 }
49 if (new_val != val) {
50 Atomic::cmpxchg(new_val, &_byte_map[card_index], val);
51 }
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