Mercurial > hg > truffle
annotate src/share/vm/memory/heapInspection.cpp @ 2015:79d8657be916
6993125: runThese crashes with assert(Thread::current()->on_local_stack((address)this))
Summary: add another ResourceObj debug field to distinguish garbage
Reviewed-by: dholmes, coleenp
author | kvn |
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date | Fri, 10 Dec 2010 14:14:02 -0800 |
parents | f95d63e2154a |
children | 3582bf76420e |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_interface/collectedHeap.hpp" | |
27 #include "memory/genCollectedHeap.hpp" | |
28 #include "memory/heapInspection.hpp" | |
29 #include "memory/resourceArea.hpp" | |
30 #include "oops/klassOop.hpp" | |
31 #include "runtime/os.hpp" | |
32 #include "utilities/globalDefinitions.hpp" | |
33 #ifndef SERIALGC | |
34 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
35 #endif | |
0 | 36 |
37 // HeapInspection | |
38 | |
39 int KlassInfoEntry::compare(KlassInfoEntry* e1, KlassInfoEntry* e2) { | |
40 if(e1->_instance_words > e2->_instance_words) { | |
41 return -1; | |
42 } else if(e1->_instance_words < e2->_instance_words) { | |
43 return 1; | |
44 } | |
45 return 0; | |
46 } | |
47 | |
48 void KlassInfoEntry::print_on(outputStream* st) const { | |
49 ResourceMark rm; | |
50 const char* name;; | |
51 if (_klass->klass_part()->name() != NULL) { | |
52 name = _klass->klass_part()->external_name(); | |
53 } else { | |
54 if (_klass == Universe::klassKlassObj()) name = "<klassKlass>"; else | |
55 if (_klass == Universe::arrayKlassKlassObj()) name = "<arrayKlassKlass>"; else | |
56 if (_klass == Universe::objArrayKlassKlassObj()) name = "<objArrayKlassKlass>"; else | |
57 if (_klass == Universe::instanceKlassKlassObj()) name = "<instanceKlassKlass>"; else | |
58 if (_klass == Universe::typeArrayKlassKlassObj()) name = "<typeArrayKlassKlass>"; else | |
59 if (_klass == Universe::symbolKlassObj()) name = "<symbolKlass>"; else | |
60 if (_klass == Universe::boolArrayKlassObj()) name = "<boolArrayKlass>"; else | |
61 if (_klass == Universe::charArrayKlassObj()) name = "<charArrayKlass>"; else | |
62 if (_klass == Universe::singleArrayKlassObj()) name = "<singleArrayKlass>"; else | |
63 if (_klass == Universe::doubleArrayKlassObj()) name = "<doubleArrayKlass>"; else | |
64 if (_klass == Universe::byteArrayKlassObj()) name = "<byteArrayKlass>"; else | |
65 if (_klass == Universe::shortArrayKlassObj()) name = "<shortArrayKlass>"; else | |
66 if (_klass == Universe::intArrayKlassObj()) name = "<intArrayKlass>"; else | |
67 if (_klass == Universe::longArrayKlassObj()) name = "<longArrayKlass>"; else | |
68 if (_klass == Universe::methodKlassObj()) name = "<methodKlass>"; else | |
69 if (_klass == Universe::constMethodKlassObj()) name = "<constMethodKlass>"; else | |
70 if (_klass == Universe::methodDataKlassObj()) name = "<methodDataKlass>"; else | |
71 if (_klass == Universe::constantPoolKlassObj()) name = "<constantPoolKlass>"; else | |
72 if (_klass == Universe::constantPoolCacheKlassObj()) name = "<constantPoolCacheKlass>"; else | |
73 if (_klass == Universe::compiledICHolderKlassObj()) name = "<compiledICHolderKlass>"; else | |
74 name = "<no name>"; | |
75 } | |
76 // simplify the formatting (ILP32 vs LP64) - always cast the numbers to 64-bit | |
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77 st->print_cr(INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13) " %s", |
0 | 78 (jlong) _instance_count, |
79 (julong) _instance_words * HeapWordSize, | |
80 name); | |
81 } | |
82 | |
83 KlassInfoEntry* KlassInfoBucket::lookup(const klassOop k) { | |
84 KlassInfoEntry* elt = _list; | |
85 while (elt != NULL) { | |
86 if (elt->is_equal(k)) { | |
87 return elt; | |
88 } | |
89 elt = elt->next(); | |
90 } | |
91 elt = new KlassInfoEntry(k, list()); | |
11
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92 // We may be out of space to allocate the new entry. |
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93 if (elt != NULL) { |
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94 set_list(elt); |
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95 } |
0 | 96 return elt; |
97 } | |
98 | |
99 void KlassInfoBucket::iterate(KlassInfoClosure* cic) { | |
100 KlassInfoEntry* elt = _list; | |
101 while (elt != NULL) { | |
102 cic->do_cinfo(elt); | |
103 elt = elt->next(); | |
104 } | |
105 } | |
106 | |
107 void KlassInfoBucket::empty() { | |
108 KlassInfoEntry* elt = _list; | |
109 _list = NULL; | |
110 while (elt != NULL) { | |
111 KlassInfoEntry* next = elt->next(); | |
112 delete elt; | |
113 elt = next; | |
114 } | |
115 } | |
116 | |
117 KlassInfoTable::KlassInfoTable(int size, HeapWord* ref) { | |
11
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118 _size = 0; |
0 | 119 _ref = ref; |
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120 _buckets = NEW_C_HEAP_ARRAY(KlassInfoBucket, size); |
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121 if (_buckets != NULL) { |
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122 _size = size; |
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123 for (int index = 0; index < _size; index++) { |
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124 _buckets[index].initialize(); |
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125 } |
0 | 126 } |
127 } | |
128 | |
129 KlassInfoTable::~KlassInfoTable() { | |
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130 if (_buckets != NULL) { |
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131 for (int index = 0; index < _size; index++) { |
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132 _buckets[index].empty(); |
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133 } |
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134 FREE_C_HEAP_ARRAY(KlassInfoBucket, _buckets); |
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135 _size = 0; |
0 | 136 } |
137 } | |
138 | |
139 uint KlassInfoTable::hash(klassOop p) { | |
140 assert(Universe::heap()->is_in_permanent((HeapWord*)p), "all klasses in permgen"); | |
141 return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2); | |
142 } | |
143 | |
144 KlassInfoEntry* KlassInfoTable::lookup(const klassOop k) { | |
145 uint idx = hash(k) % _size; | |
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146 assert(_buckets != NULL, "Allocation failure should have been caught"); |
0 | 147 KlassInfoEntry* e = _buckets[idx].lookup(k); |
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148 // Lookup may fail if this is a new klass for which we |
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149 // could not allocate space for an new entry. |
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150 assert(e == NULL || k == e->klass(), "must be equal"); |
0 | 151 return e; |
152 } | |
153 | |
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154 // Return false if the entry could not be recorded on account |
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155 // of running out of space required to create a new entry. |
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156 bool KlassInfoTable::record_instance(const oop obj) { |
0 | 157 klassOop k = obj->klass(); |
158 KlassInfoEntry* elt = lookup(k); | |
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159 // elt may be NULL if it's a new klass for which we |
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160 // could not allocate space for a new entry in the hashtable. |
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161 if (elt != NULL) { |
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162 elt->set_count(elt->count() + 1); |
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163 elt->set_words(elt->words() + obj->size()); |
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164 return true; |
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165 } else { |
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166 return false; |
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167 } |
0 | 168 } |
169 | |
170 void KlassInfoTable::iterate(KlassInfoClosure* cic) { | |
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171 assert(_size == 0 || _buckets != NULL, "Allocation failure should have been caught"); |
0 | 172 for (int index = 0; index < _size; index++) { |
173 _buckets[index].iterate(cic); | |
174 } | |
175 } | |
176 | |
177 int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) { | |
178 return (*e1)->compare(*e1,*e2); | |
179 } | |
180 | |
181 KlassInfoHisto::KlassInfoHisto(const char* title, int estimatedCount) : | |
182 _title(title) { | |
183 _elements = new (ResourceObj::C_HEAP) GrowableArray<KlassInfoEntry*>(estimatedCount,true); | |
184 } | |
185 | |
186 KlassInfoHisto::~KlassInfoHisto() { | |
187 delete _elements; | |
188 } | |
189 | |
190 void KlassInfoHisto::add(KlassInfoEntry* cie) { | |
191 elements()->append(cie); | |
192 } | |
193 | |
194 void KlassInfoHisto::sort() { | |
195 elements()->sort(KlassInfoHisto::sort_helper); | |
196 } | |
197 | |
198 void KlassInfoHisto::print_elements(outputStream* st) const { | |
199 // simplify the formatting (ILP32 vs LP64) - store the sum in 64-bit | |
200 jlong total = 0; | |
201 julong totalw = 0; | |
202 for(int i=0; i < elements()->length(); i++) { | |
203 st->print("%4d: ", i+1); | |
204 elements()->at(i)->print_on(st); | |
205 total += elements()->at(i)->count(); | |
206 totalw += elements()->at(i)->words(); | |
207 } | |
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208 st->print_cr("Total " INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13), |
0 | 209 total, totalw * HeapWordSize); |
210 } | |
211 | |
212 void KlassInfoHisto::print_on(outputStream* st) const { | |
213 st->print_cr("%s",title()); | |
214 print_elements(st); | |
215 } | |
216 | |
217 class HistoClosure : public KlassInfoClosure { | |
218 private: | |
219 KlassInfoHisto* _cih; | |
220 public: | |
221 HistoClosure(KlassInfoHisto* cih) : _cih(cih) {} | |
222 | |
223 void do_cinfo(KlassInfoEntry* cie) { | |
224 _cih->add(cie); | |
225 } | |
226 }; | |
227 | |
228 class RecordInstanceClosure : public ObjectClosure { | |
229 private: | |
230 KlassInfoTable* _cit; | |
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231 size_t _missed_count; |
0 | 232 public: |
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233 RecordInstanceClosure(KlassInfoTable* cit) : |
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234 _cit(cit), _missed_count(0) {} |
0 | 235 |
236 void do_object(oop obj) { | |
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237 if (!_cit->record_instance(obj)) { |
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238 _missed_count++; |
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239 } |
0 | 240 } |
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241 |
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242 size_t missed_count() { return _missed_count; } |
0 | 243 }; |
244 | |
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245 void HeapInspection::heap_inspection(outputStream* st, bool need_prologue) { |
0 | 246 ResourceMark rm; |
247 HeapWord* ref; | |
248 | |
249 CollectedHeap* heap = Universe::heap(); | |
342
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250 bool is_shared_heap = false; |
0 | 251 switch (heap->kind()) { |
342
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252 case CollectedHeap::G1CollectedHeap: |
0 | 253 case CollectedHeap::GenCollectedHeap: { |
342
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254 is_shared_heap = true; |
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255 SharedHeap* sh = (SharedHeap*)heap; |
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256 if (need_prologue) { |
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257 sh->gc_prologue(false /* !full */); // get any necessary locks, etc. |
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258 } |
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259 ref = sh->perm_gen()->used_region().start(); |
0 | 260 break; |
261 } | |
262 #ifndef SERIALGC | |
263 case CollectedHeap::ParallelScavengeHeap: { | |
264 ParallelScavengeHeap* psh = (ParallelScavengeHeap*)heap; | |
265 ref = psh->perm_gen()->object_space()->used_region().start(); | |
266 break; | |
267 } | |
268 #endif // SERIALGC | |
269 default: | |
270 ShouldNotReachHere(); // Unexpected heap kind for this op | |
271 } | |
272 // Collect klass instance info | |
273 KlassInfoTable cit(KlassInfoTable::cit_size, ref); | |
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274 if (!cit.allocation_failed()) { |
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275 // Iterate over objects in the heap |
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276 RecordInstanceClosure ric(&cit); |
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277 // If this operation encounters a bad object when using CMS, |
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278 // consider using safe_object_iterate() which avoids perm gen |
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279 // objects that may contain bad references. |
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280 Universe::heap()->object_iterate(&ric); |
0 | 281 |
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282 // Report if certain classes are not counted because of |
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283 // running out of C-heap for the histogram. |
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284 size_t missed_count = ric.missed_count(); |
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285 if (missed_count != 0) { |
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286 st->print_cr("WARNING: Ran out of C-heap; undercounted " SIZE_FORMAT |
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287 " total instances in data below", |
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288 missed_count); |
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289 } |
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290 // Sort and print klass instance info |
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291 KlassInfoHisto histo("\n" |
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292 " num #instances #bytes class name\n" |
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293 "----------------------------------------------", |
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294 KlassInfoHisto::histo_initial_size); |
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295 HistoClosure hc(&histo); |
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296 cit.iterate(&hc); |
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297 histo.sort(); |
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298 histo.print_on(st); |
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299 } else { |
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300 st->print_cr("WARNING: Ran out of C-heap; histogram not generated"); |
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301 } |
0 | 302 st->flush(); |
303 | |
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304 if (need_prologue && is_shared_heap) { |
342
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305 SharedHeap* sh = (SharedHeap*)heap; |
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306 sh->gc_epilogue(false /* !full */); // release all acquired locks, etc. |
0 | 307 } |
308 } | |
309 | |
310 class FindInstanceClosure : public ObjectClosure { | |
311 private: | |
312 klassOop _klass; | |
313 GrowableArray<oop>* _result; | |
314 | |
315 public: | |
316 FindInstanceClosure(klassOop k, GrowableArray<oop>* result) : _klass(k), _result(result) {}; | |
317 | |
318 void do_object(oop obj) { | |
319 if (obj->is_a(_klass)) { | |
320 _result->append(obj); | |
321 } | |
322 } | |
323 }; | |
324 | |
325 void HeapInspection::find_instances_at_safepoint(klassOop k, GrowableArray<oop>* result) { | |
326 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
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327 assert(Heap_lock->is_locked(), "should have the Heap_lock"); |
0 | 328 |
329 // Ensure that the heap is parsable | |
330 Universe::heap()->ensure_parsability(false); // no need to retire TALBs | |
331 | |
332 // Iterate over objects in the heap | |
333 FindInstanceClosure fic(k, result); | |
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334 // If this operation encounters a bad object when using CMS, |
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335 // consider using safe_object_iterate() which avoids perm gen |
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336 // objects that may contain bad references. |
0 | 337 Universe::heap()->object_iterate(&fic); |
338 } |