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 "runtime/mutexLocker.hpp"
27 #include "utilities/decoder.hpp"
28 #include "services/memBaseline.hpp"
29 #include "services/memPtr.hpp"
30 #include "services/memPtrArray.hpp"
31 #include "services/memSnapshot.hpp"
32 #include "services/memTracker.hpp"
33
34
35 bool VMMemPointerIterator::insert_record(MemPointerRecord* rec) {
36 VMMemRegionEx new_rec;
37 assert(rec->is_allocation_record() || rec->is_commit_record(),
38 "Sanity check");
39 if (MemTracker::track_callsite()) {
40 new_rec.init((MemPointerRecordEx*)rec);
41 } else {
42 new_rec.init(rec);
43 }
44 return insert(&new_rec);
45 }
46
47 bool VMMemPointerIterator::insert_record_after(MemPointerRecord* rec) {
48 VMMemRegionEx new_rec;
49 assert(rec->is_allocation_record() || rec->is_commit_record(),
50 "Sanity check");
51 if (MemTracker::track_callsite()) {
52 new_rec.init((MemPointerRecordEx*)rec);
53 } else {
54 new_rec.init(rec);
55 }
56 return insert_after(&new_rec);
57 }
58
59 // we don't consolidate reserved regions, since they may be categorized
60 // in different types.
61 bool VMMemPointerIterator::add_reserved_region(MemPointerRecord* rec) {
62 assert(rec->is_allocation_record(), "Sanity check");
63 VMMemRegion* cur = (VMMemRegion*)current();
64
65 // we don't have anything yet
66 if (cur == NULL) {
67 return insert_record(rec);
68 }
69
70 assert(cur->is_reserved_region(), "Sanity check");
71 // duplicated records
72 if (cur->is_same_region(rec)) {
73 return true;
74 }
75 assert(cur->base() > rec->addr(), "Just check: locate()");
76 assert(rec->addr() + rec->size() <= cur->base(), "Can not overlap");
77 return insert_record(rec);
78 }
79
80 // we do consolidate committed regions
81 bool VMMemPointerIterator::add_committed_region(MemPointerRecord* rec) {
82 assert(rec->is_commit_record(), "Sanity check");
83 VMMemRegion* cur;
84 cur = (VMMemRegion*)current();
85 assert(cur->is_reserved_region() && cur->contains_region(rec),
86 "Sanity check");
87
88 // thread's native stack is always marked as "committed", ignore
89 // the "commit" operation for creating stack guard pages
90 if (FLAGS_TO_MEMORY_TYPE(cur->flags()) == mtThreadStack &&
91 FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
92 return true;
93 }
94
95 cur = (VMMemRegion*)next();
96 while (cur != NULL && cur->is_committed_region()) {
97 // duplicated commit records
98 if(cur->contains_region(rec)) {
99 return true;
100 }
101 if (cur->base() > rec->addr()) {
102 // committed regions can not overlap
103 assert(rec->addr() + rec->size() <= cur->base(), "Can not overlap");
104 if (rec->addr() + rec->size() == cur->base()) {
105 cur->expand_region(rec->addr(), rec->size());
106 return true;
107 } else {
108 return insert_record(rec);
109 }
110 } else if (cur->base() + cur->size() == rec->addr()) {
111 cur->expand_region(rec->addr(), rec->size());
112 VMMemRegion* next_reg = (VMMemRegion*)next();
113 // see if we can consolidate next committed region
114 if (next_reg != NULL && next_reg->is_committed_region() &&
115 next_reg->base() == cur->base() + cur->size()) {
116 cur->expand_region(next_reg->base(), next_reg->size());
117 remove();
118 }
119 return true;
120 }
121 cur = (VMMemRegion*)next();
122 }
123 return insert_record(rec);
124 }
125
126 bool VMMemPointerIterator::remove_uncommitted_region(MemPointerRecord* rec) {
127 assert(rec->is_uncommit_record(), "sanity check");
128 VMMemRegion* cur;
129 cur = (VMMemRegion*)current();
130 assert(cur->is_reserved_region() && cur->contains_region(rec),
131 "Sanity check");
132 // thread's native stack is always marked as "committed", ignore
133 // the "commit" operation for creating stack guard pages
134 if (FLAGS_TO_MEMORY_TYPE(cur->flags()) == mtThreadStack &&
135 FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
136 return true;
137 }
138
139 cur = (VMMemRegion*)next();
140 while (cur != NULL && cur->is_committed_region()) {
141 // region already uncommitted, must be due to duplicated record
142 if (cur->addr() >= rec->addr() + rec->size()) {
143 break;
144 } else if (cur->contains_region(rec)) {
145 // uncommit whole region
146 if (cur->is_same_region(rec)) {
147 remove();
148 break;
149 } else if (rec->addr() == cur->addr() ||
150 rec->addr() + rec->size() == cur->addr() + cur->size()) {
151 // uncommitted from either end of current memory region.
152 cur->exclude_region(rec->addr(), rec->size());
153 break;
154 } else { // split the committed region and release the middle
155 address high_addr = cur->addr() + cur->size();
156 size_t sz = high_addr - rec->addr();
157 cur->exclude_region(rec->addr(), sz);
158 sz = high_addr - (rec->addr() + rec->size());
159 if (MemTracker::track_callsite()) {
160 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
161 ((VMMemRegionEx*)cur)->pc());
162 return insert_record_after(&tmp);
163 } else {
164 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
165 return insert_record_after(&tmp);
166 }
167 }
168 }
169 cur = (VMMemRegion*)next();
170 }
171
172 // we may not find committed record due to duplicated records
173 return true;
174 }
175
176 bool VMMemPointerIterator::remove_released_region(MemPointerRecord* rec) {
177 assert(rec->is_deallocation_record(), "Sanity check");
178 VMMemRegion* cur = (VMMemRegion*)current();
179 assert(cur->is_reserved_region() && cur->contains_region(rec),
180 "Sanity check");
181 #ifdef ASSERT
182 VMMemRegion* next_reg = (VMMemRegion*)peek_next();
183 // should not have any committed memory in this reserved region
184 assert(next_reg == NULL || !next_reg->is_committed_region(), "Sanity check");
185 #endif
186 if (rec->is_same_region(cur)) {
187 remove();
188 } else if (rec->addr() == cur->addr() ||
189 rec->addr() + rec->size() == cur->addr() + cur->size()) {
190 // released region is at either end of this region
191 cur->exclude_region(rec->addr(), rec->size());
192 } else { // split the reserved region and release the middle
193 address high_addr = cur->addr() + cur->size();
194 size_t sz = high_addr - rec->addr();
195 cur->exclude_region(rec->addr(), sz);
196 sz = high_addr - rec->addr() - rec->size();
197 if (MemTracker::track_callsite()) {
198 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
199 ((VMMemRegionEx*)cur)->pc());
200 return insert_reserved_region(&tmp);
201 } else {
202 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
203 return insert_reserved_region(&tmp);
204 }
205 }
206 return true;
207 }
208
209 bool VMMemPointerIterator::insert_reserved_region(MemPointerRecord* rec) {
210 // skip all 'commit' records associated with previous reserved region
211 VMMemRegion* p = (VMMemRegion*)next();
212 while (p != NULL && p->is_committed_region() &&
213 p->base() + p->size() < rec->addr()) {
214 p = (VMMemRegion*)next();
215 }
216 return insert_record(rec);
217 }
218
219 bool VMMemPointerIterator::split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size) {
220 assert(rgn->contains_region(new_rgn_addr, new_rgn_size), "Not fully contained");
221 address pc = (MemTracker::track_callsite() ? ((VMMemRegionEx*)rgn)->pc() : NULL);
222 if (rgn->base() == new_rgn_addr) { // new region is at the beginning of the region
223 size_t sz = rgn->size() - new_rgn_size;
224 // the original region becomes 'new' region
225 rgn->exclude_region(new_rgn_addr + new_rgn_size, sz);
226 // remaining becomes next region
227 MemPointerRecordEx next_rgn(new_rgn_addr + new_rgn_size, rgn->flags(), sz, pc);
228 return insert_reserved_region(&next_rgn);
229 } else if (rgn->base() + rgn->size() == new_rgn_addr + new_rgn_size) {
230 rgn->exclude_region(new_rgn_addr, new_rgn_size);
231 MemPointerRecordEx next_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
232 return insert_reserved_region(&next_rgn);
233 } else {
234 // the orginal region will be split into three
235 address rgn_high_addr = rgn->base() + rgn->size();
236 // first region
237 rgn->exclude_region(new_rgn_addr, (rgn_high_addr - new_rgn_addr));
238 // the second region is the new region
239 MemPointerRecordEx new_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
240 if (!insert_reserved_region(&new_rgn)) return false;
484 }
485 #endif
486 }
487 }
488 new_rec = (MemPointerRecord*)itr->next();
489 }
490 return true;
491 }
492
493 bool MemSnapshot::promote_virtual_memory_records(MemPointerArrayIterator* itr) {
494 VMMemPointerIterator vm_snapshot_itr(_vm_ptrs);
495 MemPointerRecord* new_rec = (MemPointerRecord*)itr->current();
496 VMMemRegion* reserved_rec;
497 while (new_rec != NULL) {
498 assert(new_rec->is_vm_pointer(), "Sanity check");
499
500 // locate a reserved region that contains the specified address, or
501 // the nearest reserved region has base address just above the specified
502 // address
503 reserved_rec = (VMMemRegion*)vm_snapshot_itr.locate(new_rec->addr());
504 if (reserved_rec != NULL && reserved_rec->contains_region(new_rec)) {
505 // snapshot can only have 'live' records
506 assert(reserved_rec->is_reserved_region(), "Sanity check");
507 if (new_rec->is_allocation_record()) {
508 if (!reserved_rec->is_same_region(new_rec)) {
509 // only deal with split a bigger reserved region into smaller regions.
510 // So far, CDS is the only use case.
511 if (!vm_snapshot_itr.split_reserved_region(reserved_rec, new_rec->addr(), new_rec->size())) {
512 return false;
513 }
514 }
515 } else if (new_rec->is_uncommit_record()) {
516 if (!vm_snapshot_itr.remove_uncommitted_region(new_rec)) {
517 return false;
518 }
519 } else if (new_rec->is_commit_record()) {
520 // insert or expand existing committed region to cover this
521 // newly committed region
522 if (!vm_snapshot_itr.add_committed_region(new_rec)) {
523 return false;
524 }
|
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 "runtime/mutexLocker.hpp"
27 #include "utilities/decoder.hpp"
28 #include "services/memBaseline.hpp"
29 #include "services/memPtr.hpp"
30 #include "services/memPtrArray.hpp"
31 #include "services/memSnapshot.hpp"
32 #include "services/memTracker.hpp"
33
34 #ifdef ASSERT
35
36 void decode_pointer_record(MemPointerRecord* rec) {
37 tty->print("Pointer: [" PTR_FORMAT " - " PTR_FORMAT "] size = %d bytes", rec->addr(),
38 rec->addr() + rec->size(), (int)rec->size());
39 tty->print(" type = %s", MemBaseline::type2name(FLAGS_TO_MEMORY_TYPE(rec->flags())));
40 if (rec->is_vm_pointer()) {
41 if (rec->is_allocation_record()) {
42 tty->print_cr(" (reserve)");
43 } else if (rec->is_commit_record()) {
44 tty->print_cr(" (commit)");
45 } else if (rec->is_uncommit_record()) {
46 tty->print_cr(" (uncommit)");
47 } else if (rec->is_deallocation_record()) {
48 tty->print_cr(" (release)");
49 } else {
50 tty->print_cr(" (tag)");
51 }
52 } else {
53 if (rec->is_arena_size_record()) {
54 tty->print_cr(" (arena size)");
55 } else if (rec->is_allocation_record()) {
56 tty->print_cr(" (malloc)");
57 } else {
58 tty->print_cr(" (free)");
59 }
60 }
61 if (MemTracker::track_callsite()) {
62 char buf[1024];
63 address pc = ((MemPointerRecordEx*)rec)->pc();
64 if (pc != NULL && os::dll_address_to_function_name(pc, buf, sizeof(buf), NULL)) {
65 tty->print_cr("\tfrom %s", buf);
66 } else {
67 tty->print_cr("\tcould not decode pc = " PTR_FORMAT "", pc);
68 }
69 }
70 }
71
72 void decode_vm_region_record(VMMemRegion* rec) {
73 tty->print("VM Region [" PTR_FORMAT " - " PTR_FORMAT "]", rec->addr(),
74 rec->addr() + rec->size());
75 tty->print(" type = %s", MemBaseline::type2name(FLAGS_TO_MEMORY_TYPE(rec->flags())));
76 if (rec->is_allocation_record()) {
77 tty->print_cr(" (reserved)");
78 } else if (rec->is_commit_record()) {
79 tty->print_cr(" (committed)");
80 } else {
81 ShouldNotReachHere();
82 }
83 if (MemTracker::track_callsite()) {
84 char buf[1024];
85 address pc = ((VMMemRegionEx*)rec)->pc();
86 if (pc != NULL && os::dll_address_to_function_name(pc, buf, sizeof(buf), NULL)) {
87 tty->print_cr("\tfrom %s", buf);
88 } else {
89 tty->print_cr("\tcould not decode pc = " PTR_FORMAT "", pc);
90 }
91
92 }
93 }
94
95 #endif
96
97
98 bool VMMemPointerIterator::insert_record(MemPointerRecord* rec) {
99 VMMemRegionEx new_rec;
100 assert(rec->is_allocation_record() || rec->is_commit_record(),
101 "Sanity check");
102 if (MemTracker::track_callsite()) {
103 new_rec.init((MemPointerRecordEx*)rec);
104 } else {
105 new_rec.init(rec);
106 }
107 return insert(&new_rec);
108 }
109
110 bool VMMemPointerIterator::insert_record_after(MemPointerRecord* rec) {
111 VMMemRegionEx new_rec;
112 assert(rec->is_allocation_record() || rec->is_commit_record(),
113 "Sanity check");
114 if (MemTracker::track_callsite()) {
115 new_rec.init((MemPointerRecordEx*)rec);
116 } else {
117 new_rec.init(rec);
118 }
119 return insert_after(&new_rec);
120 }
121
122 // we don't consolidate reserved regions, since they may be categorized
123 // in different types.
124 bool VMMemPointerIterator::add_reserved_region(MemPointerRecord* rec) {
125 assert(rec->is_allocation_record(), "Sanity check");
126 VMMemRegion* reserved_rgn = (VMMemRegion*)current();
127
128 // we don't have anything yet
129 if (reserved_rgn == NULL) {
130 return insert_record(rec);
131 }
132
133 assert(reserved_rgn->is_reserved_region(), "Sanity check");
134 // duplicated records
135 if (reserved_rgn->is_same_region(rec)) {
136 return true;
137 }
138 assert(reserved_rgn->base() > rec->addr(), "Just check: locate()");
139 assert(!reserved_rgn->overlap_region(rec), "Can not overlap");
140 return insert_record(rec);
141 }
142
143 // we do consolidate committed regions
144 bool VMMemPointerIterator::add_committed_region(MemPointerRecord* rec) {
145 assert(rec->is_commit_record(), "Sanity check");
146 VMMemRegion* reserved_rgn = (VMMemRegion*)current();
147 assert(reserved_rgn->is_reserved_region() && reserved_rgn->contain_region(rec),
148 "Sanity check");
149
150 // thread's native stack is always marked as "committed", ignore
151 // the "commit" operation for creating stack guard pages
152 if (FLAGS_TO_MEMORY_TYPE(reserved_rgn->flags()) == mtThreadStack &&
153 FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
154 return true;
155 }
156
157 // if the reserved region has any committed regions
158 VMMemRegion* committed_rgn = (VMMemRegion*)next();
159 while (committed_rgn != NULL && committed_rgn->is_committed_region()) {
160 // duplicated commit records
161 if(committed_rgn->contain_region(rec)) {
162 return true;
163 } else if (committed_rgn->overlap_region(rec)) {
164 // overlaps front part
165 if (rec->addr() < committed_rgn->addr()) {
166 committed_rgn->expand_region(rec->addr(),
167 committed_rgn->addr() - rec->addr());
168 } else {
169 // overlaps tail part
170 address committed_rgn_end = committed_rgn->addr() +
171 committed_rgn->size();
172 assert(committed_rgn_end < rec->addr() + rec->size(),
173 "overlap tail part");
174 committed_rgn->expand_region(committed_rgn_end,
175 (rec->addr() + rec->size()) - committed_rgn_end);
176 }
177 } else if (committed_rgn->base() + committed_rgn->size() == rec->addr()) {
178 // adjunct each other
179 committed_rgn->expand_region(rec->addr(), rec->size());
180 VMMemRegion* next_reg = (VMMemRegion*)next();
181 // see if we can consolidate next committed region
182 if (next_reg != NULL && next_reg->is_committed_region() &&
183 next_reg->base() == committed_rgn->base() + committed_rgn->size()) {
184 committed_rgn->expand_region(next_reg->base(), next_reg->size());
185 // delete merged region
186 remove();
187 }
188 return true;
189 } else if (committed_rgn->base() > rec->addr()) {
190 // found the location, insert this committed region
191 return insert_record(rec);
192 }
193 committed_rgn = (VMMemRegion*)next();
194 }
195 return insert_record(rec);
196 }
197
198 bool VMMemPointerIterator::remove_uncommitted_region(MemPointerRecord* rec) {
199 assert(rec->is_uncommit_record(), "sanity check");
200 VMMemRegion* cur;
201 cur = (VMMemRegion*)current();
202 assert(cur->is_reserved_region() && cur->contain_region(rec),
203 "Sanity check");
204 // thread's native stack is always marked as "committed", ignore
205 // the "commit" operation for creating stack guard pages
206 if (FLAGS_TO_MEMORY_TYPE(cur->flags()) == mtThreadStack &&
207 FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
208 return true;
209 }
210
211 cur = (VMMemRegion*)next();
212 while (cur != NULL && cur->is_committed_region()) {
213 // region already uncommitted, must be due to duplicated record
214 if (cur->addr() >= rec->addr() + rec->size()) {
215 break;
216 } else if (cur->contain_region(rec)) {
217 // uncommit whole region
218 if (cur->is_same_region(rec)) {
219 remove();
220 break;
221 } else if (rec->addr() == cur->addr() ||
222 rec->addr() + rec->size() == cur->addr() + cur->size()) {
223 // uncommitted from either end of current memory region.
224 cur->exclude_region(rec->addr(), rec->size());
225 break;
226 } else { // split the committed region and release the middle
227 address high_addr = cur->addr() + cur->size();
228 size_t sz = high_addr - rec->addr();
229 cur->exclude_region(rec->addr(), sz);
230 sz = high_addr - (rec->addr() + rec->size());
231 if (MemTracker::track_callsite()) {
232 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
233 ((VMMemRegionEx*)cur)->pc());
234 return insert_record_after(&tmp);
235 } else {
236 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
237 return insert_record_after(&tmp);
238 }
239 }
240 }
241 cur = (VMMemRegion*)next();
242 }
243
244 // we may not find committed record due to duplicated records
245 return true;
246 }
247
248 bool VMMemPointerIterator::remove_released_region(MemPointerRecord* rec) {
249 assert(rec->is_deallocation_record(), "Sanity check");
250 VMMemRegion* cur = (VMMemRegion*)current();
251 assert(cur->is_reserved_region() && cur->contain_region(rec),
252 "Sanity check");
253 #ifdef ASSERT
254 VMMemRegion* next_reg = (VMMemRegion*)peek_next();
255 // should not have any committed memory in this reserved region
256 assert(next_reg == NULL || !next_reg->is_committed_region(), "Sanity check");
257 #endif
258 if (rec->is_same_region(cur)) {
259 remove();
260 } else if (rec->addr() == cur->addr() ||
261 rec->addr() + rec->size() == cur->addr() + cur->size()) {
262 // released region is at either end of this region
263 cur->exclude_region(rec->addr(), rec->size());
264 } else { // split the reserved region and release the middle
265 address high_addr = cur->addr() + cur->size();
266 size_t sz = high_addr - rec->addr();
267 cur->exclude_region(rec->addr(), sz);
268 sz = high_addr - rec->addr() - rec->size();
269 if (MemTracker::track_callsite()) {
270 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
271 ((VMMemRegionEx*)cur)->pc());
272 return insert_reserved_region(&tmp);
273 } else {
274 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
275 return insert_reserved_region(&tmp);
276 }
277 }
278 return true;
279 }
280
281 bool VMMemPointerIterator::insert_reserved_region(MemPointerRecord* rec) {
282 // skip all 'commit' records associated with previous reserved region
283 VMMemRegion* p = (VMMemRegion*)next();
284 while (p != NULL && p->is_committed_region() &&
285 p->base() + p->size() < rec->addr()) {
286 p = (VMMemRegion*)next();
287 }
288 return insert_record(rec);
289 }
290
291 bool VMMemPointerIterator::split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size) {
292 assert(rgn->contain_region(new_rgn_addr, new_rgn_size), "Not fully contained");
293 address pc = (MemTracker::track_callsite() ? ((VMMemRegionEx*)rgn)->pc() : NULL);
294 if (rgn->base() == new_rgn_addr) { // new region is at the beginning of the region
295 size_t sz = rgn->size() - new_rgn_size;
296 // the original region becomes 'new' region
297 rgn->exclude_region(new_rgn_addr + new_rgn_size, sz);
298 // remaining becomes next region
299 MemPointerRecordEx next_rgn(new_rgn_addr + new_rgn_size, rgn->flags(), sz, pc);
300 return insert_reserved_region(&next_rgn);
301 } else if (rgn->base() + rgn->size() == new_rgn_addr + new_rgn_size) {
302 rgn->exclude_region(new_rgn_addr, new_rgn_size);
303 MemPointerRecordEx next_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
304 return insert_reserved_region(&next_rgn);
305 } else {
306 // the orginal region will be split into three
307 address rgn_high_addr = rgn->base() + rgn->size();
308 // first region
309 rgn->exclude_region(new_rgn_addr, (rgn_high_addr - new_rgn_addr));
310 // the second region is the new region
311 MemPointerRecordEx new_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
312 if (!insert_reserved_region(&new_rgn)) return false;
556 }
557 #endif
558 }
559 }
560 new_rec = (MemPointerRecord*)itr->next();
561 }
562 return true;
563 }
564
565 bool MemSnapshot::promote_virtual_memory_records(MemPointerArrayIterator* itr) {
566 VMMemPointerIterator vm_snapshot_itr(_vm_ptrs);
567 MemPointerRecord* new_rec = (MemPointerRecord*)itr->current();
568 VMMemRegion* reserved_rec;
569 while (new_rec != NULL) {
570 assert(new_rec->is_vm_pointer(), "Sanity check");
571
572 // locate a reserved region that contains the specified address, or
573 // the nearest reserved region has base address just above the specified
574 // address
575 reserved_rec = (VMMemRegion*)vm_snapshot_itr.locate(new_rec->addr());
576 if (reserved_rec != NULL && reserved_rec->contain_region(new_rec)) {
577 // snapshot can only have 'live' records
578 assert(reserved_rec->is_reserved_region(), "Sanity check");
579 if (new_rec->is_allocation_record()) {
580 if (!reserved_rec->is_same_region(new_rec)) {
581 // only deal with split a bigger reserved region into smaller regions.
582 // So far, CDS is the only use case.
583 if (!vm_snapshot_itr.split_reserved_region(reserved_rec, new_rec->addr(), new_rec->size())) {
584 return false;
585 }
586 }
587 } else if (new_rec->is_uncommit_record()) {
588 if (!vm_snapshot_itr.remove_uncommitted_region(new_rec)) {
589 return false;
590 }
591 } else if (new_rec->is_commit_record()) {
592 // insert or expand existing committed region to cover this
593 // newly committed region
594 if (!vm_snapshot_itr.add_committed_region(new_rec)) {
595 return false;
596 }
|