Mercurial > hg > graal-compiler
annotate src/share/vm/memory/heapInspection.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 16fb9f942703 db9981fd3124 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2012, 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 * | |
|
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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 "runtime/os.hpp" | |
| 31 #include "utilities/globalDefinitions.hpp" | |
| 32 #ifndef SERIALGC | |
| 33 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 34 #endif | |
| 0 | 35 |
| 36 // HeapInspection | |
| 37 | |
| 38 int KlassInfoEntry::compare(KlassInfoEntry* e1, KlassInfoEntry* e2) { | |
| 39 if(e1->_instance_words > e2->_instance_words) { | |
| 40 return -1; | |
| 41 } else if(e1->_instance_words < e2->_instance_words) { | |
| 42 return 1; | |
| 43 } | |
| 44 return 0; | |
| 45 } | |
| 46 | |
| 47 void KlassInfoEntry::print_on(outputStream* st) const { | |
| 48 ResourceMark rm; | |
| 49 const char* name;; | |
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50 if (_klass->name() != NULL) { |
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51 name = _klass->external_name(); |
| 0 | 52 } else { |
| 53 if (_klass == Universe::boolArrayKlassObj()) name = "<boolArrayKlass>"; else | |
| 54 if (_klass == Universe::charArrayKlassObj()) name = "<charArrayKlass>"; else | |
| 55 if (_klass == Universe::singleArrayKlassObj()) name = "<singleArrayKlass>"; else | |
| 56 if (_klass == Universe::doubleArrayKlassObj()) name = "<doubleArrayKlass>"; else | |
| 57 if (_klass == Universe::byteArrayKlassObj()) name = "<byteArrayKlass>"; else | |
| 58 if (_klass == Universe::shortArrayKlassObj()) name = "<shortArrayKlass>"; else | |
| 59 if (_klass == Universe::intArrayKlassObj()) name = "<intArrayKlass>"; else | |
| 60 if (_klass == Universe::longArrayKlassObj()) name = "<longArrayKlass>"; else | |
| 61 name = "<no name>"; | |
| 62 } | |
| 63 // simplify the formatting (ILP32 vs LP64) - always cast the numbers to 64-bit | |
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64 st->print_cr(INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13) " %s", |
| 0 | 65 (jlong) _instance_count, |
| 66 (julong) _instance_words * HeapWordSize, | |
| 67 name); | |
| 68 } | |
| 69 | |
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70 KlassInfoEntry* KlassInfoBucket::lookup(Klass* const k) { |
| 0 | 71 KlassInfoEntry* elt = _list; |
| 72 while (elt != NULL) { | |
| 73 if (elt->is_equal(k)) { | |
| 74 return elt; | |
| 75 } | |
| 76 elt = elt->next(); | |
| 77 } | |
| 78 elt = new KlassInfoEntry(k, list()); | |
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79 // We may be out of space to allocate the new entry. |
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80 if (elt != NULL) { |
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81 set_list(elt); |
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82 } |
| 0 | 83 return elt; |
| 84 } | |
| 85 | |
| 86 void KlassInfoBucket::iterate(KlassInfoClosure* cic) { | |
| 87 KlassInfoEntry* elt = _list; | |
| 88 while (elt != NULL) { | |
| 89 cic->do_cinfo(elt); | |
| 90 elt = elt->next(); | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 void KlassInfoBucket::empty() { | |
| 95 KlassInfoEntry* elt = _list; | |
| 96 _list = NULL; | |
| 97 while (elt != NULL) { | |
| 98 KlassInfoEntry* next = elt->next(); | |
| 99 delete elt; | |
| 100 elt = next; | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 KlassInfoTable::KlassInfoTable(int size, HeapWord* ref) { | |
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105 _size = 0; |
| 0 | 106 _ref = ref; |
| 6197 | 107 _buckets = NEW_C_HEAP_ARRAY(KlassInfoBucket, size, mtInternal); |
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108 if (_buckets != NULL) { |
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109 _size = size; |
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110 for (int index = 0; index < _size; index++) { |
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111 _buckets[index].initialize(); |
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112 } |
| 0 | 113 } |
| 114 } | |
| 115 | |
| 116 KlassInfoTable::~KlassInfoTable() { | |
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117 if (_buckets != NULL) { |
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118 for (int index = 0; index < _size; index++) { |
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119 _buckets[index].empty(); |
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120 } |
| 6197 | 121 FREE_C_HEAP_ARRAY(KlassInfoBucket, _buckets, mtInternal); |
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122 _size = 0; |
| 0 | 123 } |
| 124 } | |
| 125 | |
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126 uint KlassInfoTable::hash(Klass* p) { |
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127 assert(p->is_metadata(), "all klasses are metadata"); |
| 0 | 128 return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2); |
| 129 } | |
| 130 | |
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131 KlassInfoEntry* KlassInfoTable::lookup(Klass* const k) { |
| 0 | 132 uint idx = hash(k) % _size; |
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133 assert(_buckets != NULL, "Allocation failure should have been caught"); |
| 0 | 134 KlassInfoEntry* e = _buckets[idx].lookup(k); |
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135 // Lookup may fail if this is a new klass for which we |
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136 // could not allocate space for an new entry. |
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137 assert(e == NULL || k == e->klass(), "must be equal"); |
| 0 | 138 return e; |
| 139 } | |
| 140 | |
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141 // Return false if the entry could not be recorded on account |
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142 // of running out of space required to create a new entry. |
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143 bool KlassInfoTable::record_instance(const oop obj) { |
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144 Klass* k = obj->klass(); |
| 0 | 145 KlassInfoEntry* elt = lookup(k); |
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146 // elt may be NULL if it's a new klass for which we |
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147 // could not allocate space for a new entry in the hashtable. |
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148 if (elt != NULL) { |
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149 elt->set_count(elt->count() + 1); |
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150 elt->set_words(elt->words() + obj->size()); |
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151 return true; |
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152 } else { |
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153 return false; |
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154 } |
| 0 | 155 } |
| 156 | |
| 157 void KlassInfoTable::iterate(KlassInfoClosure* cic) { | |
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158 assert(_size == 0 || _buckets != NULL, "Allocation failure should have been caught"); |
| 0 | 159 for (int index = 0; index < _size; index++) { |
| 160 _buckets[index].iterate(cic); | |
| 161 } | |
| 162 } | |
| 163 | |
| 164 int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) { | |
| 165 return (*e1)->compare(*e1,*e2); | |
| 166 } | |
| 167 | |
| 168 KlassInfoHisto::KlassInfoHisto(const char* title, int estimatedCount) : | |
| 169 _title(title) { | |
| 6197 | 170 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(estimatedCount,true); |
| 0 | 171 } |
| 172 | |
| 173 KlassInfoHisto::~KlassInfoHisto() { | |
| 174 delete _elements; | |
| 175 } | |
| 176 | |
| 177 void KlassInfoHisto::add(KlassInfoEntry* cie) { | |
| 178 elements()->append(cie); | |
| 179 } | |
| 180 | |
| 181 void KlassInfoHisto::sort() { | |
| 182 elements()->sort(KlassInfoHisto::sort_helper); | |
| 183 } | |
| 184 | |
| 185 void KlassInfoHisto::print_elements(outputStream* st) const { | |
| 186 // simplify the formatting (ILP32 vs LP64) - store the sum in 64-bit | |
| 187 jlong total = 0; | |
| 188 julong totalw = 0; | |
| 189 for(int i=0; i < elements()->length(); i++) { | |
| 190 st->print("%4d: ", i+1); | |
| 191 elements()->at(i)->print_on(st); | |
| 192 total += elements()->at(i)->count(); | |
| 193 totalw += elements()->at(i)->words(); | |
| 194 } | |
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195 st->print_cr("Total " INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13), |
| 0 | 196 total, totalw * HeapWordSize); |
| 197 } | |
| 198 | |
| 199 void KlassInfoHisto::print_on(outputStream* st) const { | |
| 200 st->print_cr("%s",title()); | |
| 201 print_elements(st); | |
| 202 } | |
| 203 | |
| 204 class HistoClosure : public KlassInfoClosure { | |
| 205 private: | |
| 206 KlassInfoHisto* _cih; | |
| 207 public: | |
| 208 HistoClosure(KlassInfoHisto* cih) : _cih(cih) {} | |
| 209 | |
| 210 void do_cinfo(KlassInfoEntry* cie) { | |
| 211 _cih->add(cie); | |
| 212 } | |
| 213 }; | |
| 214 | |
| 215 class RecordInstanceClosure : public ObjectClosure { | |
| 216 private: | |
| 217 KlassInfoTable* _cit; | |
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218 size_t _missed_count; |
| 0 | 219 public: |
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220 RecordInstanceClosure(KlassInfoTable* cit) : |
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221 _cit(cit), _missed_count(0) {} |
| 0 | 222 |
| 223 void do_object(oop obj) { | |
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224 if (!_cit->record_instance(obj)) { |
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225 _missed_count++; |
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226 } |
| 0 | 227 } |
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228 |
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229 size_t missed_count() { return _missed_count; } |
| 0 | 230 }; |
| 231 | |
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232 void HeapInspection::heap_inspection(outputStream* st, bool need_prologue) { |
| 0 | 233 ResourceMark rm; |
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234 // Get some random number for ref (the hash key) |
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235 HeapWord* ref = (HeapWord*) Universe::boolArrayKlassObj(); |
| 0 | 236 CollectedHeap* heap = Universe::heap(); |
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237 bool is_shared_heap = false; |
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238 |
| 0 | 239 // Collect klass instance info |
| 240 KlassInfoTable cit(KlassInfoTable::cit_size, ref); | |
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241 if (!cit.allocation_failed()) { |
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242 // Iterate over objects in the heap |
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243 RecordInstanceClosure ric(&cit); |
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244 Universe::heap()->object_iterate(&ric); |
| 0 | 245 |
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246 // Report if certain classes are not counted because of |
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247 // running out of C-heap for the histogram. |
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248 size_t missed_count = ric.missed_count(); |
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249 if (missed_count != 0) { |
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250 st->print_cr("WARNING: Ran out of C-heap; undercounted " SIZE_FORMAT |
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251 " total instances in data below", |
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252 missed_count); |
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253 } |
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254 // Sort and print klass instance info |
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255 KlassInfoHisto histo("\n" |
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256 " num #instances #bytes class name\n" |
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257 "----------------------------------------------", |
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258 KlassInfoHisto::histo_initial_size); |
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259 HistoClosure hc(&histo); |
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260 cit.iterate(&hc); |
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261 histo.sort(); |
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262 histo.print_on(st); |
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263 } else { |
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264 st->print_cr("WARNING: Ran out of C-heap; histogram not generated"); |
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265 } |
| 0 | 266 st->flush(); |
| 267 | |
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268 if (need_prologue && is_shared_heap) { |
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269 SharedHeap* sh = (SharedHeap*)heap; |
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270 sh->gc_epilogue(false /* !full */); // release all acquired locks, etc. |
| 0 | 271 } |
| 272 } | |
| 273 | |
| 274 class FindInstanceClosure : public ObjectClosure { | |
| 275 private: | |
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276 Klass* _klass; |
| 0 | 277 GrowableArray<oop>* _result; |
| 278 | |
| 279 public: | |
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280 FindInstanceClosure(Klass* k, GrowableArray<oop>* result) : _klass(k), _result(result) {}; |
| 0 | 281 |
| 282 void do_object(oop obj) { | |
| 283 if (obj->is_a(_klass)) { | |
| 284 _result->append(obj); | |
| 285 } | |
| 286 } | |
| 287 }; | |
| 288 | |
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289 void HeapInspection::find_instances_at_safepoint(Klass* k, GrowableArray<oop>* result) { |
| 0 | 290 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); |
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291 assert(Heap_lock->is_locked(), "should have the Heap_lock"); |
| 0 | 292 |
| 293 // Ensure that the heap is parsable | |
| 294 Universe::heap()->ensure_parsability(false); // no need to retire TALBs | |
| 295 | |
| 296 // Iterate over objects in the heap | |
| 297 FindInstanceClosure fic(k, result); | |
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298 // If this operation encounters a bad object when using CMS, |
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299 // consider using safe_object_iterate() which avoids metadata |
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300 // objects that may contain bad references. |
| 0 | 301 Universe::heap()->object_iterate(&fic); |
| 302 } |