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/g1/g1FullCollector.inline.hpp"
27 #include "gc/g1/g1FullGCCompactionPoint.hpp"
28 #include "gc/g1/g1HeapRegion.hpp"
29 #include "gc/shared/preservedMarks.inline.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "utilities/debug.hpp"
32
33 G1FullGCCompactionPoint::G1FullGCCompactionPoint(G1FullCollector* collector, PreservedMarks* preserved_stack) :
34 _collector(collector),
35 _current_region(nullptr),
36 _compaction_top(nullptr),
37 _preserved_stack(preserved_stack) {
38 _compaction_regions = new (mtGC) GrowableArray<G1HeapRegion*>(32, mtGC);
39 _compaction_region_iterator = _compaction_regions->begin();
40 }
41
42 G1FullGCCompactionPoint::~G1FullGCCompactionPoint() {
43 delete _compaction_regions;
44 }
45
46 void G1FullGCCompactionPoint::update() {
47 if (is_initialized()) {
48 _collector->set_compaction_top(_current_region, _compaction_top);
49 }
89 // Save compaction top in the region.
90 _collector->set_compaction_top(_current_region, _compaction_top);
91 // Get the next region and re-initialize the values.
92 _current_region = next_region();
93 initialize_values();
94 }
95
96 void G1FullGCCompactionPoint::forward(oop object, size_t size) {
97 assert(_current_region != nullptr, "Must have been initialized");
98
99 // Ensure the object fit in the current region.
100 while (!object_will_fit(size)) {
101 switch_region();
102 }
103
104 // Store a forwarding pointer if the object should be moved.
105 if (cast_from_oop<HeapWord*>(object) != _compaction_top) {
106 if (!object->is_forwarded()) {
107 preserved_stack()->push_if_necessary(object, object->mark());
108 }
109 object->forward_to(cast_to_oop(_compaction_top));
110 assert(object->is_forwarded(), "must be forwarded");
111 } else {
112 assert(!object->is_forwarded(), "must not be forwarded");
113 }
114
115 // Update compaction values.
116 _compaction_top += size;
117 _current_region->update_bot_for_block(_compaction_top - size, _compaction_top);
118 }
119
120 void G1FullGCCompactionPoint::add(G1HeapRegion* hr) {
121 _compaction_regions->append(hr);
122 }
123
124 void G1FullGCCompactionPoint::remove_at_or_above(uint bottom) {
125 G1HeapRegion* cur = current_region();
126 assert(cur->hrm_index() >= bottom, "Sanity!");
127
128 int start_index = 0;
129 for (G1HeapRegion* r : *_compaction_regions) {
130 if (r->hrm_index() < bottom) {
131 start_index++;
132 }
155 oop obj = cast_to_oop(hr->bottom());
156 size_t obj_size = obj->size();
157 uint num_regions = (uint)G1CollectedHeap::humongous_obj_size_in_regions(obj_size);
158
159 if (!has_regions()) {
160 return;
161 }
162
163 // Find contiguous compaction target regions for the humongous object.
164 uint range_begin = find_contiguous_before(hr, num_regions);
165
166 if (range_begin == UINT_MAX) {
167 // No contiguous compaction target regions found, so the object cannot be moved.
168 return;
169 }
170
171 // Preserve the mark for the humongous object as the region was initially not compacting.
172 preserved_stack()->push_if_necessary(obj, obj->mark());
173
174 G1HeapRegion* dest_hr = _compaction_regions->at(range_begin);
175 obj->forward_to(cast_to_oop(dest_hr->bottom()));
176 assert(obj->is_forwarded(), "Object must be forwarded!");
177
178 // Add the humongous object regions to the compaction point.
179 add_humongous(hr);
180
181 // Remove covered regions from compaction target candidates.
182 _compaction_regions->remove_range(range_begin, (range_begin + num_regions));
183
184 return;
185 }
186
187 uint G1FullGCCompactionPoint::find_contiguous_before(G1HeapRegion* hr, uint num_regions) {
188 assert(num_regions > 0, "Sanity!");
189 assert(has_regions(), "Sanity!");
190
191 if (num_regions == 1) {
192 // If only one region, return the first region.
193 return 0;
194 }
195
196 uint contiguous_region_count = 1;
|
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/g1/g1FullCollector.inline.hpp"
27 #include "gc/g1/g1FullGCCompactionPoint.hpp"
28 #include "gc/g1/g1HeapRegion.hpp"
29 #include "gc/shared/preservedMarks.inline.hpp"
30 #include "gc/shared/slidingForwarding.inline.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "utilities/debug.hpp"
33
34 G1FullGCCompactionPoint::G1FullGCCompactionPoint(G1FullCollector* collector, PreservedMarks* preserved_stack) :
35 _collector(collector),
36 _current_region(nullptr),
37 _compaction_top(nullptr),
38 _preserved_stack(preserved_stack) {
39 _compaction_regions = new (mtGC) GrowableArray<G1HeapRegion*>(32, mtGC);
40 _compaction_region_iterator = _compaction_regions->begin();
41 }
42
43 G1FullGCCompactionPoint::~G1FullGCCompactionPoint() {
44 delete _compaction_regions;
45 }
46
47 void G1FullGCCompactionPoint::update() {
48 if (is_initialized()) {
49 _collector->set_compaction_top(_current_region, _compaction_top);
50 }
90 // Save compaction top in the region.
91 _collector->set_compaction_top(_current_region, _compaction_top);
92 // Get the next region and re-initialize the values.
93 _current_region = next_region();
94 initialize_values();
95 }
96
97 void G1FullGCCompactionPoint::forward(oop object, size_t size) {
98 assert(_current_region != nullptr, "Must have been initialized");
99
100 // Ensure the object fit in the current region.
101 while (!object_will_fit(size)) {
102 switch_region();
103 }
104
105 // Store a forwarding pointer if the object should be moved.
106 if (cast_from_oop<HeapWord*>(object) != _compaction_top) {
107 if (!object->is_forwarded()) {
108 preserved_stack()->push_if_necessary(object, object->mark());
109 }
110 SlidingForwarding::forward_to(object, cast_to_oop(_compaction_top));
111 assert(SlidingForwarding::is_forwarded(object), "must be forwarded");
112 } else {
113 assert(SlidingForwarding::is_not_forwarded(object), "must not be forwarded");
114 }
115
116 // Update compaction values.
117 _compaction_top += size;
118 _current_region->update_bot_for_block(_compaction_top - size, _compaction_top);
119 }
120
121 void G1FullGCCompactionPoint::add(G1HeapRegion* hr) {
122 _compaction_regions->append(hr);
123 }
124
125 void G1FullGCCompactionPoint::remove_at_or_above(uint bottom) {
126 G1HeapRegion* cur = current_region();
127 assert(cur->hrm_index() >= bottom, "Sanity!");
128
129 int start_index = 0;
130 for (G1HeapRegion* r : *_compaction_regions) {
131 if (r->hrm_index() < bottom) {
132 start_index++;
133 }
156 oop obj = cast_to_oop(hr->bottom());
157 size_t obj_size = obj->size();
158 uint num_regions = (uint)G1CollectedHeap::humongous_obj_size_in_regions(obj_size);
159
160 if (!has_regions()) {
161 return;
162 }
163
164 // Find contiguous compaction target regions for the humongous object.
165 uint range_begin = find_contiguous_before(hr, num_regions);
166
167 if (range_begin == UINT_MAX) {
168 // No contiguous compaction target regions found, so the object cannot be moved.
169 return;
170 }
171
172 // Preserve the mark for the humongous object as the region was initially not compacting.
173 preserved_stack()->push_if_necessary(obj, obj->mark());
174
175 G1HeapRegion* dest_hr = _compaction_regions->at(range_begin);
176 SlidingForwarding::forward_to(obj, cast_to_oop(dest_hr->bottom()));
177 assert(SlidingForwarding::is_forwarded(obj), "Object must be forwarded!");
178
179 // Add the humongous object regions to the compaction point.
180 add_humongous(hr);
181
182 // Remove covered regions from compaction target candidates.
183 _compaction_regions->remove_range(range_begin, (range_begin + num_regions));
184
185 return;
186 }
187
188 uint G1FullGCCompactionPoint::find_contiguous_before(G1HeapRegion* hr, uint num_regions) {
189 assert(num_regions > 0, "Sanity!");
190 assert(has_regions(), "Sanity!");
191
192 if (num_regions == 1) {
193 // If only one region, return the first region.
194 return 0;
195 }
196
197 uint contiguous_region_count = 1;
|