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
26 #include "gc/shared/gcCause.hpp"
27 #include "gc/shenandoah/shenandoahForwarding.hpp"
28 #include "gc/shenandoah/shenandoahCollectionSet.inline.hpp"
29 #include "gc/shenandoah/shenandoahCollectorPolicy.hpp"
30 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
31 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
32 #include "gc/shenandoah/shenandoahHeuristics.hpp"
33 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logTag.hpp"
36
37 int ShenandoahHeuristics::compare_by_garbage(RegionData a, RegionData b) {
38 if (a._garbage > b._garbage)
39 return -1;
40 else if (a._garbage < b._garbage)
41 return 1;
42 else return 0;
43 }
44
45 int ShenandoahHeuristics::compare_by_garbage_then_alloc_seq_ascending(RegionData a, RegionData b) {
46 int r = compare_by_garbage(a, b);
47 if (r != 0) {
147
148 if (region->is_empty()) {
149 free_regions++;
150 free += ShenandoahHeapRegion::region_size_bytes();
151 } else if (region->is_regular()) {
152 if (!region->has_live()) {
153 // We can recycle it right away and put it in the free set.
154 immediate_regions++;
155 immediate_garbage += garbage;
156 region->make_trash_immediate();
157 } else {
158 // This is our candidate for later consideration.
159 candidates[cand_idx]._region = region;
160 candidates[cand_idx]._garbage = garbage;
161 cand_idx++;
162 }
163 } else if (region->is_humongous_start()) {
164 // Reclaim humongous regions here, and count them as the immediate garbage
165 #ifdef ASSERT
166 bool reg_live = region->has_live();
167 bool bm_live = ctx->is_marked(oop(region->bottom() + ShenandoahForwarding::word_size()));
168 assert(reg_live == bm_live,
169 "Humongous liveness and marks should agree. Region live: %s; Bitmap live: %s; Region Live Words: " SIZE_FORMAT,
170 BOOL_TO_STR(reg_live), BOOL_TO_STR(bm_live), region->get_live_data_words());
171 #endif
172 if (!region->has_live()) {
173 heap->trash_humongous_region_at(region);
174
175 // Count only the start. Continuations would be counted on "trash" path
176 immediate_regions++;
177 immediate_garbage += garbage;
178 }
179 } else if (region->is_trash()) {
180 // Count in just trashed collection set, during coalesced CM-with-UR
181 immediate_regions++;
182 immediate_garbage += garbage;
183 }
184 }
185
186 // Step 2. Look back at garbage statistics, and decide if we want to collect anything,
187 // given the amount of immediately reclaimable garbage. If we do, figure out the collection set.
|
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
26 #include "gc/shared/gcCause.hpp"
27 #include "gc/shenandoah/shenandoahCollectionSet.inline.hpp"
28 #include "gc/shenandoah/shenandoahCollectorPolicy.hpp"
29 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
30 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
31 #include "gc/shenandoah/shenandoahHeuristics.hpp"
32 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
33 #include "logging/log.hpp"
34 #include "logging/logTag.hpp"
35
36 int ShenandoahHeuristics::compare_by_garbage(RegionData a, RegionData b) {
37 if (a._garbage > b._garbage)
38 return -1;
39 else if (a._garbage < b._garbage)
40 return 1;
41 else return 0;
42 }
43
44 int ShenandoahHeuristics::compare_by_garbage_then_alloc_seq_ascending(RegionData a, RegionData b) {
45 int r = compare_by_garbage(a, b);
46 if (r != 0) {
146
147 if (region->is_empty()) {
148 free_regions++;
149 free += ShenandoahHeapRegion::region_size_bytes();
150 } else if (region->is_regular()) {
151 if (!region->has_live()) {
152 // We can recycle it right away and put it in the free set.
153 immediate_regions++;
154 immediate_garbage += garbage;
155 region->make_trash_immediate();
156 } else {
157 // This is our candidate for later consideration.
158 candidates[cand_idx]._region = region;
159 candidates[cand_idx]._garbage = garbage;
160 cand_idx++;
161 }
162 } else if (region->is_humongous_start()) {
163 // Reclaim humongous regions here, and count them as the immediate garbage
164 #ifdef ASSERT
165 bool reg_live = region->has_live();
166 bool bm_live = ctx->is_marked(oop(region->bottom()));
167 assert(reg_live == bm_live,
168 "Humongous liveness and marks should agree. Region live: %s; Bitmap live: %s; Region Live Words: " SIZE_FORMAT,
169 BOOL_TO_STR(reg_live), BOOL_TO_STR(bm_live), region->get_live_data_words());
170 #endif
171 if (!region->has_live()) {
172 heap->trash_humongous_region_at(region);
173
174 // Count only the start. Continuations would be counted on "trash" path
175 immediate_regions++;
176 immediate_garbage += garbage;
177 }
178 } else if (region->is_trash()) {
179 // Count in just trashed collection set, during coalesced CM-with-UR
180 immediate_regions++;
181 immediate_garbage += garbage;
182 }
183 }
184
185 // Step 2. Look back at garbage statistics, and decide if we want to collect anything,
186 // given the amount of immediately reclaimable garbage. If we do, figure out the collection set.
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