5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #include "precompiled.hpp"
25 #include "gc/g1/g1CardTable.inline.hpp"
26 #include "gc/g1/g1CollectedHeap.inline.hpp"
27 #include "gc/g1/g1SATBCardTableModRefBS.inline.hpp"
28 #include "gc/g1/heapRegion.hpp"
29 #include "gc/g1/satbMarkQueue.hpp"
30 #include "logging/log.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "runtime/mutexLocker.hpp"
33 #include "runtime/thread.inline.hpp"
34
35 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(
36 G1CardTable* card_table,
37 const BarrierSet::FakeRtti& fake_rtti) :
38 CardTableModRefBS(card_table, fake_rtti.add_tag(BarrierSet::G1SATBCT))
39 { }
40
41 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
42 // Nulls should have been already filtered.
43 assert(oopDesc::is_oop(pre_val, true), "Error");
44
45 if (!JavaThread::satb_mark_queue_set().is_active()) return;
46 Thread* thr = Thread::current();
47 if (thr->is_Java_thread()) {
48 JavaThread* jt = (JavaThread*)thr;
49 jt->satb_mark_queue().enqueue(pre_val);
50 } else {
51 MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag);
52 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
53 }
54 }
55
56 template <class T> void
57 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
58 if (!JavaThread::satb_mark_queue_set().is_active()) return;
59 T* elem_ptr = dst;
60 for (int i = 0; i < count; i++, elem_ptr++) {
61 T heap_oop = oopDesc::load_heap_oop(elem_ptr);
62 if (!oopDesc::is_null(heap_oop)) {
63 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
64 }
65 }
66 }
67
68 void G1SATBCardTableModRefBS::write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) {
69 if (!dest_uninitialized) {
70 write_ref_array_pre_work(dst, count);
71 }
72 }
73
74 void G1SATBCardTableModRefBS::write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) {
75 if (!dest_uninitialized) {
76 write_ref_array_pre_work(dst, count);
77 }
78 }
79
80 G1SATBCardTableLoggingModRefBS::
81 G1SATBCardTableLoggingModRefBS(G1CardTable* card_table) :
82 G1SATBCardTableModRefBS(card_table, BarrierSet::FakeRtti(G1SATBCTLogging)),
83 _dcqs(JavaThread::dirty_card_queue_set()) {}
84
85 void G1SATBCardTableLoggingModRefBS::write_ref_field_post_slow(volatile jbyte* byte) {
86 // In the slow path, we know a card is not young
87 assert(*byte != G1CardTable::g1_young_card_val(), "slow path invoked without filtering");
88 OrderAccess::storeload();
89 if (*byte != G1CardTable::dirty_card_val()) {
90 *byte = G1CardTable::dirty_card_val();
91 Thread* thr = Thread::current();
92 if (thr->is_Java_thread()) {
93 JavaThread* jt = (JavaThread*)thr;
94 jt->dirty_card_queue().enqueue(byte);
95 } else {
96 MutexLockerEx x(Shared_DirtyCardQ_lock,
97 Mutex::_no_safepoint_check_flag);
98 _dcqs.shared_dirty_card_queue()->enqueue(byte);
99 }
100 }
101 }
102
103 void G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr) {
104 if (mr.is_empty()) {
105 return;
106 }
107 volatile jbyte* byte = _card_table->byte_for(mr.start());
108 jbyte* last_byte = _card_table->byte_for(mr.last());
109 Thread* thr = Thread::current();
110 // skip all consecutive young cards
111 for (; byte <= last_byte && *byte == G1CardTable::g1_young_card_val(); byte++);
112
113 if (byte <= last_byte) {
114 OrderAccess::storeload();
115 // Enqueue if necessary.
116 if (thr->is_Java_thread()) {
117 JavaThread* jt = (JavaThread*)thr;
118 for (; byte <= last_byte; byte++) {
119 if (*byte == G1CardTable::g1_young_card_val()) {
120 continue;
121 }
122 if (*byte != G1CardTable::dirty_card_val()) {
123 *byte = G1CardTable::dirty_card_val();
124 jt->dirty_card_queue().enqueue(byte);
125 }
126 }
127 } else {
128 MutexLockerEx x(Shared_DirtyCardQ_lock,
129 Mutex::_no_safepoint_check_flag);
130 for (; byte <= last_byte; byte++) {
131 if (*byte == G1CardTable::g1_young_card_val()) {
132 continue;
133 }
134 if (*byte != G1CardTable::dirty_card_val()) {
135 *byte = G1CardTable::dirty_card_val();
136 _dcqs.shared_dirty_card_queue()->enqueue(byte);
137 }
138 }
139 }
140 }
141 }
142
143 void G1SATBCardTableLoggingModRefBS::on_thread_attach(JavaThread* thread) {
144 // This method initializes the SATB and dirty card queues before a
145 // JavaThread is added to the Java thread list. Right now, we don't
146 // have to do anything to the dirty card queue (it should have been
147 // activated when the thread was created), but we have to activate
148 // the SATB queue if the thread is created while a marking cycle is
149 // in progress. The activation / de-activation of the SATB queues at
150 // the beginning / end of a marking cycle is done during safepoints
151 // so we have to make sure this method is called outside one to be
152 // able to safely read the active field of the SATB queue set. Right
153 // now, it is called just before the thread is added to the Java
154 // thread list in the Threads::add() method. That method is holding
155 // the Threads_lock which ensures we are outside a safepoint. We
156 // cannot do the obvious and set the active field of the SATB queue
157 // when the thread is created given that, in some cases, safepoints
158 // might happen between the JavaThread constructor being called and the
159 // thread being added to the Java thread list (an example of this is
160 // when the structure for the DestroyJavaVM thread is created).
161 assert(!SafepointSynchronize::is_at_safepoint(), "We should not be at a safepoint");
162 assert(!thread->satb_mark_queue().is_active(), "SATB queue should not be active");
163 assert(thread->satb_mark_queue().is_empty(), "SATB queue should be empty");
164 assert(thread->dirty_card_queue().is_active(), "Dirty card queue should be active");
165
166 // If we are creating the thread during a marking cycle, we should
167 // set the active field of the SATB queue to true.
168 if (thread->satb_mark_queue_set().is_active()) {
169 thread->satb_mark_queue().set_active(true);
170 }
171 }
172
173 void G1SATBCardTableLoggingModRefBS::on_thread_detach(JavaThread* thread) {
174 // Flush any deferred card marks, SATB buffers and dirty card queue buffers
175 CardTableModRefBS::on_thread_detach(thread);
176 thread->satb_mark_queue().flush();
177 thread->dirty_card_queue().flush();
178 }
|
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #include "precompiled.hpp"
25 #include "gc/g1/g1BarrierSet.inline.hpp"
26 #include "gc/g1/g1CardTable.inline.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/g1/heapRegion.hpp"
29 #include "gc/g1/satbMarkQueue.hpp"
30 #include "logging/log.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "runtime/mutexLocker.hpp"
33 #include "runtime/thread.inline.hpp"
34
35 G1BarrierSet::G1BarrierSet(G1CardTable* card_table) :
36 CardTableModRefBS(card_table, BarrierSet::FakeRtti(BarrierSet::G1BarrierSet)),
37 _dcqs(JavaThread::dirty_card_queue_set())
38 { }
39
40 void G1BarrierSet::enqueue(oop pre_val) {
41 // Nulls should have been already filtered.
42 assert(oopDesc::is_oop(pre_val, true), "Error");
43
44 if (!JavaThread::satb_mark_queue_set().is_active()) return;
45 Thread* thr = Thread::current();
46 if (thr->is_Java_thread()) {
47 JavaThread* jt = (JavaThread*)thr;
48 jt->satb_mark_queue().enqueue(pre_val);
49 } else {
50 MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag);
51 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
52 }
53 }
54
55 template <class T> void
56 G1BarrierSet::write_ref_array_pre_work(T* dst, int count) {
57 if (!JavaThread::satb_mark_queue_set().is_active()) return;
58 T* elem_ptr = dst;
59 for (int i = 0; i < count; i++, elem_ptr++) {
60 T heap_oop = oopDesc::load_heap_oop(elem_ptr);
61 if (!oopDesc::is_null(heap_oop)) {
62 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
63 }
64 }
65 }
66
67 void G1BarrierSet::write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) {
68 if (!dest_uninitialized) {
69 write_ref_array_pre_work(dst, count);
70 }
71 }
72
73 void G1BarrierSet::write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) {
74 if (!dest_uninitialized) {
75 write_ref_array_pre_work(dst, count);
76 }
77 }
78
79 void G1BarrierSet::write_ref_field_post_slow(volatile jbyte* byte) {
80 // In the slow path, we know a card is not young
81 assert(*byte != G1CardTable::g1_young_card_val(), "slow path invoked without filtering");
82 OrderAccess::storeload();
83 if (*byte != G1CardTable::dirty_card_val()) {
84 *byte = G1CardTable::dirty_card_val();
85 Thread* thr = Thread::current();
86 if (thr->is_Java_thread()) {
87 JavaThread* jt = (JavaThread*)thr;
88 jt->dirty_card_queue().enqueue(byte);
89 } else {
90 MutexLockerEx x(Shared_DirtyCardQ_lock,
91 Mutex::_no_safepoint_check_flag);
92 _dcqs.shared_dirty_card_queue()->enqueue(byte);
93 }
94 }
95 }
96
97 void G1BarrierSet::invalidate(MemRegion mr) {
98 if (mr.is_empty()) {
99 return;
100 }
101 volatile jbyte* byte = _card_table->byte_for(mr.start());
102 jbyte* last_byte = _card_table->byte_for(mr.last());
103 Thread* thr = Thread::current();
104 // skip all consecutive young cards
105 for (; byte <= last_byte && *byte == G1CardTable::g1_young_card_val(); byte++);
106
107 if (byte <= last_byte) {
108 OrderAccess::storeload();
109 // Enqueue if necessary.
110 if (thr->is_Java_thread()) {
111 JavaThread* jt = (JavaThread*)thr;
112 for (; byte <= last_byte; byte++) {
113 if (*byte == G1CardTable::g1_young_card_val()) {
114 continue;
115 }
116 if (*byte != G1CardTable::dirty_card_val()) {
117 *byte = G1CardTable::dirty_card_val();
118 jt->dirty_card_queue().enqueue(byte);
119 }
120 }
121 } else {
122 MutexLockerEx x(Shared_DirtyCardQ_lock,
123 Mutex::_no_safepoint_check_flag);
124 for (; byte <= last_byte; byte++) {
125 if (*byte == G1CardTable::g1_young_card_val()) {
126 continue;
127 }
128 if (*byte != G1CardTable::dirty_card_val()) {
129 *byte = G1CardTable::dirty_card_val();
130 _dcqs.shared_dirty_card_queue()->enqueue(byte);
131 }
132 }
133 }
134 }
135 }
136
137 void G1BarrierSet::on_thread_attach(JavaThread* thread) {
138 // This method initializes the SATB and dirty card queues before a
139 // JavaThread is added to the Java thread list. Right now, we don't
140 // have to do anything to the dirty card queue (it should have been
141 // activated when the thread was created), but we have to activate
142 // the SATB queue if the thread is created while a marking cycle is
143 // in progress. The activation / de-activation of the SATB queues at
144 // the beginning / end of a marking cycle is done during safepoints
145 // so we have to make sure this method is called outside one to be
146 // able to safely read the active field of the SATB queue set. Right
147 // now, it is called just before the thread is added to the Java
148 // thread list in the Threads::add() method. That method is holding
149 // the Threads_lock which ensures we are outside a safepoint. We
150 // cannot do the obvious and set the active field of the SATB queue
151 // when the thread is created given that, in some cases, safepoints
152 // might happen between the JavaThread constructor being called and the
153 // thread being added to the Java thread list (an example of this is
154 // when the structure for the DestroyJavaVM thread is created).
155 assert(!SafepointSynchronize::is_at_safepoint(), "We should not be at a safepoint");
156 assert(!thread->satb_mark_queue().is_active(), "SATB queue should not be active");
157 assert(thread->satb_mark_queue().is_empty(), "SATB queue should be empty");
158 assert(thread->dirty_card_queue().is_active(), "Dirty card queue should be active");
159
160 // If we are creating the thread during a marking cycle, we should
161 // set the active field of the SATB queue to true.
162 if (thread->satb_mark_queue_set().is_active()) {
163 thread->satb_mark_queue().set_active(true);
164 }
165 }
166
167 void G1BarrierSet::on_thread_detach(JavaThread* thread) {
168 // Flush any deferred card marks, SATB buffers and dirty card queue buffers
169 CardTableModRefBS::on_thread_detach(thread);
170 thread->satb_mark_queue().flush();
171 thread->dirty_card_queue().flush();
172 }
|