Mercurial > hg > truffle
annotate src/share/vm/services/memBaseline.cpp @ 10148:fbca7eaeac2e
8011218: Kitchensink hanged, likely NMT is to blame
Summary: Made NMT query safepoint aware.
Reviewed-by: dholmes, coleenp
| author | zgu |
|---|---|
| date | Wed, 24 Apr 2013 14:55:04 -0400 |
| parents | 4102b59539ce |
| children | ed5a590835a4 |
| rev | line source |
|---|---|
| 6197 | 1 /* |
| 10148 | 2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| 6197 | 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 * | |
| 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 #include "precompiled.hpp" | |
| 25 #include "memory/allocation.hpp" | |
| 10148 | 26 #include "runtime/safepoint.hpp" |
| 27 #include "runtime/thread.inline.hpp" | |
| 6197 | 28 #include "services/memBaseline.hpp" |
| 29 #include "services/memTracker.hpp" | |
| 30 | |
| 10148 | 31 |
| 6197 | 32 MemType2Name MemBaseline::MemType2NameMap[NUMBER_OF_MEMORY_TYPE] = { |
| 33 {mtJavaHeap, "Java Heap"}, | |
| 34 {mtClass, "Class"}, | |
| 35 {mtThreadStack,"Thread Stack"}, | |
| 36 {mtThread, "Thread"}, | |
| 37 {mtCode, "Code"}, | |
| 38 {mtGC, "GC"}, | |
| 39 {mtCompiler, "Compiler"}, | |
| 40 {mtInternal, "Internal"}, | |
| 41 {mtOther, "Other"}, | |
| 42 {mtSymbol, "Symbol"}, | |
| 43 {mtNMT, "Memory Tracking"}, | |
| 44 {mtChunk, "Pooled Free Chunks"}, | |
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45 {mtClassShared,"Shared spaces for classes"}, |
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46 {mtTest, "Test"}, |
| 6197 | 47 {mtNone, "Unknown"} // It can happen when type tagging records are lagging |
| 48 // behind | |
| 49 }; | |
| 50 | |
| 51 MemBaseline::MemBaseline() { | |
| 52 _baselined = false; | |
| 53 | |
| 54 for (int index = 0; index < NUMBER_OF_MEMORY_TYPE; index ++) { | |
| 55 _malloc_data[index].set_type(MemType2NameMap[index]._flag); | |
| 56 _vm_data[index].set_type(MemType2NameMap[index]._flag); | |
| 57 _arena_data[index].set_type(MemType2NameMap[index]._flag); | |
| 58 } | |
| 59 | |
| 60 _malloc_cs = NULL; | |
| 61 _vm_cs = NULL; | |
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62 _vm_map = NULL; |
| 6197 | 63 |
| 64 _number_of_classes = 0; | |
| 65 _number_of_threads = 0; | |
| 66 } | |
| 67 | |
| 68 | |
| 69 void MemBaseline::clear() { | |
| 70 if (_malloc_cs != NULL) { | |
| 71 delete _malloc_cs; | |
| 72 _malloc_cs = NULL; | |
| 73 } | |
| 74 | |
| 75 if (_vm_cs != NULL) { | |
| 76 delete _vm_cs; | |
| 77 _vm_cs = NULL; | |
| 78 } | |
| 79 | |
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80 if (_vm_map != NULL) { |
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81 delete _vm_map; |
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82 _vm_map = NULL; |
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83 } |
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84 |
| 6197 | 85 reset(); |
| 86 } | |
| 87 | |
| 88 | |
| 89 void MemBaseline::reset() { | |
| 90 _baselined = false; | |
| 91 _total_vm_reserved = 0; | |
| 92 _total_vm_committed = 0; | |
| 93 _total_malloced = 0; | |
| 94 _number_of_classes = 0; | |
| 95 | |
| 96 if (_malloc_cs != NULL) _malloc_cs->clear(); | |
| 97 if (_vm_cs != NULL) _vm_cs->clear(); | |
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98 if (_vm_map != NULL) _vm_map->clear(); |
| 6197 | 99 |
| 100 for (int index = 0; index < NUMBER_OF_MEMORY_TYPE; index ++) { | |
| 101 _malloc_data[index].clear(); | |
| 102 _vm_data[index].clear(); | |
| 103 _arena_data[index].clear(); | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 MemBaseline::~MemBaseline() { | |
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108 clear(); |
| 6197 | 109 } |
| 110 | |
| 111 // baseline malloc'd memory records, generate overall summary and summaries by | |
| 112 // memory types | |
| 113 bool MemBaseline::baseline_malloc_summary(const MemPointerArray* malloc_records) { | |
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114 MemPointerArrayIteratorImpl malloc_itr((MemPointerArray*)malloc_records); |
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115 MemPointerRecord* malloc_ptr = (MemPointerRecord*)malloc_itr.current(); |
| 6197 | 116 size_t used_arena_size = 0; |
| 117 int index; | |
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118 while (malloc_ptr != NULL) { |
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119 index = flag2index(FLAGS_TO_MEMORY_TYPE(malloc_ptr->flags())); |
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120 size_t size = malloc_ptr->size(); |
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121 if (malloc_ptr->is_arena_memory_record()) { |
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122 // We do have anonymous arenas, they are either used as value objects, |
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123 // which are embedded inside other objects, or used as stack objects. |
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124 _arena_data[index].inc(size); |
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125 used_arena_size += size; |
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126 } else { |
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127 _total_malloced += size; |
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128 _malloc_data[index].inc(size); |
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129 if (malloc_ptr->is_arena_record()) { |
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130 // see if arena memory record present |
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131 MemPointerRecord* next_malloc_ptr = (MemPointerRecordEx*)malloc_itr.peek_next(); |
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132 if (next_malloc_ptr->is_arena_memory_record()) { |
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133 assert(next_malloc_ptr->is_memory_record_of_arena(malloc_ptr), |
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134 "Arena records do not match"); |
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135 size = next_malloc_ptr->size(); |
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136 _arena_data[index].inc(size); |
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137 used_arena_size += size; |
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138 malloc_itr.next(); |
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139 } |
| 6197 | 140 } |
| 141 } | |
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142 malloc_ptr = (MemPointerRecordEx*)malloc_itr.next(); |
| 6197 | 143 } |
| 144 | |
| 145 // substract used arena size to get size of arena chunk in free list | |
| 146 index = flag2index(mtChunk); | |
| 147 _malloc_data[index].reduce(used_arena_size); | |
| 148 // we really don't know how many chunks in free list, so just set to | |
| 149 // 0 | |
| 150 _malloc_data[index].overwrite_counter(0); | |
| 151 | |
| 152 return true; | |
| 153 } | |
| 154 | |
| 10148 | 155 // check if there is a safepoint in progress, if so, block the thread |
| 156 // for the safepoint | |
| 157 void MemBaseline::check_safepoint(JavaThread* thr) { | |
| 158 if (SafepointSynchronize::is_synchronizing()) { | |
| 159 SafepointSynchronize::block(thr); | |
| 160 } | |
| 161 } | |
| 162 | |
| 6197 | 163 // baseline mmap'd memory records, generate overall summary and summaries by |
| 164 // memory types | |
| 165 bool MemBaseline::baseline_vm_summary(const MemPointerArray* vm_records) { | |
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166 MemPointerArrayIteratorImpl vm_itr((MemPointerArray*)vm_records); |
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167 VMMemRegion* vm_ptr = (VMMemRegion*)vm_itr.current(); |
| 6197 | 168 int index; |
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169 while (vm_ptr != NULL) { |
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170 if (vm_ptr->is_reserved_region()) { |
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171 index = flag2index(FLAGS_TO_MEMORY_TYPE(vm_ptr->flags())); |
| 6197 | 172 // we use the number of thread stack to count threads |
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173 if (IS_MEMORY_TYPE(vm_ptr->flags(), mtThreadStack)) { |
| 6197 | 174 _number_of_threads ++; |
| 175 } | |
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176 _total_vm_reserved += vm_ptr->size(); |
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177 _vm_data[index].inc(vm_ptr->size(), 0); |
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178 } else { |
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179 _total_vm_committed += vm_ptr->size(); |
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180 _vm_data[index].inc(0, vm_ptr->size()); |
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181 } |
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182 vm_ptr = (VMMemRegion*)vm_itr.next(); |
| 6197 | 183 } |
| 184 return true; | |
| 185 } | |
| 186 | |
| 187 // baseline malloc'd memory by callsites, but only the callsites with memory allocation | |
| 188 // over 1KB are stored. | |
| 189 bool MemBaseline::baseline_malloc_details(const MemPointerArray* malloc_records) { | |
| 190 assert(MemTracker::track_callsite(), "detail tracking is off"); | |
| 191 | |
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192 MemPointerArrayIteratorImpl malloc_itr(const_cast<MemPointerArray*>(malloc_records)); |
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193 MemPointerRecordEx* malloc_ptr = (MemPointerRecordEx*)malloc_itr.current(); |
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194 MallocCallsitePointer malloc_callsite; |
| 6197 | 195 |
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196 // initailize malloc callsite array |
| 6197 | 197 if (_malloc_cs == NULL) { |
| 198 _malloc_cs = new (std::nothrow) MemPointerArrayImpl<MallocCallsitePointer>(64); | |
| 199 // out of native memory | |
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200 if (_malloc_cs == NULL || _malloc_cs->out_of_memory()) { |
| 6197 | 201 return false; |
| 202 } | |
| 203 } else { | |
| 204 _malloc_cs->clear(); | |
| 205 } | |
| 206 | |
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207 MemPointerArray* malloc_data = const_cast<MemPointerArray*>(malloc_records); |
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208 |
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209 // sort into callsite pc order. Details are aggregated by callsites |
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210 malloc_data->sort((FN_SORT)malloc_sort_by_pc); |
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211 bool ret = true; |
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212 |
| 6197 | 213 // baseline memory that is totaled over 1 KB |
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214 while (malloc_ptr != NULL) { |
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215 if (!MemPointerRecord::is_arena_memory_record(malloc_ptr->flags())) { |
| 6197 | 216 // skip thread stacks |
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217 if (!IS_MEMORY_TYPE(malloc_ptr->flags(), mtThreadStack)) { |
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218 if (malloc_callsite.addr() != malloc_ptr->pc()) { |
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219 if ((malloc_callsite.amount()/K) > 0) { |
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220 if (!_malloc_cs->append(&malloc_callsite)) { |
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221 ret = false; |
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222 break; |
| 6197 | 223 } |
| 224 } | |
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225 malloc_callsite = MallocCallsitePointer(malloc_ptr->pc()); |
| 6197 | 226 } |
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227 malloc_callsite.inc(malloc_ptr->size()); |
| 6197 | 228 } |
| 229 } | |
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230 malloc_ptr = (MemPointerRecordEx*)malloc_itr.next(); |
| 6197 | 231 } |
| 232 | |
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233 // restore to address order. Snapshot malloc data is maintained in memory |
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234 // address order. |
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235 malloc_data->sort((FN_SORT)malloc_sort_by_addr); |
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236 |
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237 if (!ret) { |
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238 return false; |
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239 } |
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240 // deal with last record |
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241 if (malloc_callsite.addr() != 0 && (malloc_callsite.amount()/K) > 0) { |
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242 if (!_malloc_cs->append(&malloc_callsite)) { |
| 6197 | 243 return false; |
| 244 } | |
| 245 } | |
| 246 return true; | |
| 247 } | |
| 248 | |
| 249 // baseline mmap'd memory by callsites | |
| 250 bool MemBaseline::baseline_vm_details(const MemPointerArray* vm_records) { | |
| 251 assert(MemTracker::track_callsite(), "detail tracking is off"); | |
| 252 | |
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253 VMCallsitePointer vm_callsite; |
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254 VMCallsitePointer* cur_callsite = NULL; |
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255 MemPointerArrayIteratorImpl vm_itr((MemPointerArray*)vm_records); |
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256 VMMemRegionEx* vm_ptr = (VMMemRegionEx*)vm_itr.current(); |
| 6197 | 257 |
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258 // initialize virtual memory map array |
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259 if (_vm_map == NULL) { |
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260 _vm_map = new (std::nothrow) MemPointerArrayImpl<VMMemRegionEx>(vm_records->length()); |
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261 if (_vm_map == NULL || _vm_map->out_of_memory()) { |
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262 return false; |
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263 } |
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264 } else { |
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265 _vm_map->clear(); |
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266 } |
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267 |
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268 // initialize virtual memory callsite array |
| 6197 | 269 if (_vm_cs == NULL) { |
| 270 _vm_cs = new (std::nothrow) MemPointerArrayImpl<VMCallsitePointer>(64); | |
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271 if (_vm_cs == NULL || _vm_cs->out_of_memory()) { |
| 6197 | 272 return false; |
| 273 } | |
| 274 } else { | |
| 275 _vm_cs->clear(); | |
| 276 } | |
| 277 | |
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278 // consolidate virtual memory data |
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279 VMMemRegionEx* reserved_rec = NULL; |
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280 VMMemRegionEx* committed_rec = NULL; |
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281 |
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282 // vm_ptr is coming in increasing base address order |
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283 while (vm_ptr != NULL) { |
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284 if (vm_ptr->is_reserved_region()) { |
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285 // consolidate reserved memory regions for virtual memory map. |
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286 // The criteria for consolidation is: |
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287 // 1. two adjacent reserved memory regions |
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288 // 2. belong to the same memory type |
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289 // 3. reserved from the same callsite |
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290 if (reserved_rec == NULL || |
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291 reserved_rec->base() + reserved_rec->size() != vm_ptr->addr() || |
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292 FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) != FLAGS_TO_MEMORY_TYPE(vm_ptr->flags()) || |
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293 reserved_rec->pc() != vm_ptr->pc()) { |
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294 if (!_vm_map->append(vm_ptr)) { |
| 6197 | 295 return false; |
| 296 } | |
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297 // inserted reserved region, we need the pointer to the element in virtual |
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298 // memory map array. |
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299 reserved_rec = (VMMemRegionEx*)_vm_map->at(_vm_map->length() - 1); |
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300 } else { |
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301 reserved_rec->expand_region(vm_ptr->addr(), vm_ptr->size()); |
| 6197 | 302 } |
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303 |
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304 if (cur_callsite != NULL && !_vm_cs->append(cur_callsite)) { |
| 6197 | 305 return false; |
| 306 } | |
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307 vm_callsite = VMCallsitePointer(vm_ptr->pc()); |
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308 cur_callsite = &vm_callsite; |
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309 vm_callsite.inc(vm_ptr->size(), 0); |
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310 } else { |
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311 // consolidate committed memory regions for virtual memory map |
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312 // The criterial is: |
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313 // 1. two adjacent committed memory regions |
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314 // 2. committed from the same callsite |
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315 if (committed_rec == NULL || |
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316 committed_rec->base() + committed_rec->size() != vm_ptr->addr() || |
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317 committed_rec->pc() != vm_ptr->pc()) { |
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318 if (!_vm_map->append(vm_ptr)) { |
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319 return false; |
| 10148 | 320 } |
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321 committed_rec = (VMMemRegionEx*)_vm_map->at(_vm_map->length() - 1); |
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322 } else { |
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323 committed_rec->expand_region(vm_ptr->addr(), vm_ptr->size()); |
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324 } |
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325 vm_callsite.inc(0, vm_ptr->size()); |
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326 } |
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327 vm_ptr = (VMMemRegionEx*)vm_itr.next(); |
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328 } |
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329 // deal with last record |
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330 if (cur_callsite != NULL && !_vm_cs->append(cur_callsite)) { |
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331 return false; |
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332 } |
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333 |
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334 // sort it into callsite pc order. Details are aggregated by callsites |
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335 _vm_cs->sort((FN_SORT)bl_vm_sort_by_pc); |
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336 |
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337 // walk the array to consolidate record by pc |
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338 MemPointerArrayIteratorImpl itr(_vm_cs); |
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339 VMCallsitePointer* callsite_rec = (VMCallsitePointer*)itr.current(); |
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340 VMCallsitePointer* next_rec = (VMCallsitePointer*)itr.next(); |
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341 while (next_rec != NULL) { |
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342 assert(callsite_rec != NULL, "Sanity check"); |
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343 if (next_rec->addr() == callsite_rec->addr()) { |
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344 callsite_rec->inc(next_rec->reserved_amount(), next_rec->committed_amount()); |
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345 itr.remove(); |
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346 next_rec = (VMCallsitePointer*)itr.current(); |
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347 } else { |
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348 callsite_rec = next_rec; |
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349 next_rec = (VMCallsitePointer*)itr.next(); |
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350 } |
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351 } |
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352 |
| 6197 | 353 return true; |
| 354 } | |
| 355 | |
| 356 // baseline a snapshot. If summary_only = false, memory usages aggregated by | |
| 357 // callsites are also baselined. | |
| 10148 | 358 // The method call can be lengthy, especially when detail tracking info is |
| 359 // requested. So the method checks for safepoint explicitly. | |
| 6197 | 360 bool MemBaseline::baseline(MemSnapshot& snapshot, bool summary_only) { |
| 10148 | 361 Thread* THREAD = Thread::current(); |
| 362 assert(THREAD->is_Java_thread(), "must be a JavaThread"); | |
| 363 MutexLocker snapshot_locker(snapshot._lock); | |
| 6197 | 364 reset(); |
| 10148 | 365 _baselined = baseline_malloc_summary(snapshot._alloc_ptrs); |
| 366 if (_baselined) { | |
| 367 check_safepoint((JavaThread*)THREAD); | |
| 368 _baselined = baseline_vm_summary(snapshot._vm_ptrs); | |
| 369 } | |
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370 _number_of_classes = snapshot.number_of_classes(); |
| 6197 | 371 |
| 372 if (!summary_only && MemTracker::track_callsite() && _baselined) { | |
| 10148 | 373 check_safepoint((JavaThread*)THREAD); |
| 374 _baselined = baseline_malloc_details(snapshot._alloc_ptrs); | |
| 375 if (_baselined) { | |
| 376 check_safepoint((JavaThread*)THREAD); | |
| 377 _baselined = baseline_vm_details(snapshot._vm_ptrs); | |
| 378 } | |
| 6197 | 379 } |
| 380 return _baselined; | |
| 381 } | |
| 382 | |
| 383 | |
| 384 int MemBaseline::flag2index(MEMFLAGS flag) const { | |
| 385 for (int index = 0; index < NUMBER_OF_MEMORY_TYPE; index ++) { | |
| 386 if (MemType2NameMap[index]._flag == flag) { | |
| 387 return index; | |
| 388 } | |
| 389 } | |
| 390 assert(false, "no type"); | |
| 391 return -1; | |
| 392 } | |
| 393 | |
| 394 const char* MemBaseline::type2name(MEMFLAGS type) { | |
| 395 for (int index = 0; index < NUMBER_OF_MEMORY_TYPE; index ++) { | |
| 396 if (MemType2NameMap[index]._flag == type) { | |
| 397 return MemType2NameMap[index]._name; | |
| 398 } | |
| 399 } | |
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400 assert(false, err_msg("bad type %x", type)); |
| 6197 | 401 return NULL; |
| 402 } | |
| 403 | |
| 404 | |
| 405 MemBaseline& MemBaseline::operator=(const MemBaseline& other) { | |
| 406 _total_malloced = other._total_malloced; | |
| 407 _total_vm_reserved = other._total_vm_reserved; | |
| 408 _total_vm_committed = other._total_vm_committed; | |
| 409 | |
| 410 _baselined = other._baselined; | |
| 411 _number_of_classes = other._number_of_classes; | |
| 412 | |
| 413 for (int index = 0; index < NUMBER_OF_MEMORY_TYPE; index ++) { | |
| 414 _malloc_data[index] = other._malloc_data[index]; | |
| 415 _vm_data[index] = other._vm_data[index]; | |
| 416 _arena_data[index] = other._arena_data[index]; | |
| 417 } | |
| 418 | |
| 419 if (MemTracker::track_callsite()) { | |
| 420 assert(_malloc_cs != NULL && _vm_cs != NULL, "out of memory"); | |
| 421 assert(other._malloc_cs != NULL && other._vm_cs != NULL, | |
| 422 "not properly baselined"); | |
| 423 _malloc_cs->clear(); | |
| 424 _vm_cs->clear(); | |
| 425 int index; | |
| 426 for (index = 0; index < other._malloc_cs->length(); index ++) { | |
| 427 _malloc_cs->append(other._malloc_cs->at(index)); | |
| 428 } | |
| 429 | |
| 430 for (index = 0; index < other._vm_cs->length(); index ++) { | |
| 431 _vm_cs->append(other._vm_cs->at(index)); | |
| 432 } | |
| 433 } | |
| 434 return *this; | |
| 435 } | |
| 436 | |
| 437 /* compare functions for sorting */ | |
| 438 | |
| 439 // sort snapshot malloc'd records in callsite pc order | |
| 440 int MemBaseline::malloc_sort_by_pc(const void* p1, const void* p2) { | |
| 441 assert(MemTracker::track_callsite(),"Just check"); | |
| 442 const MemPointerRecordEx* mp1 = (const MemPointerRecordEx*)p1; | |
| 443 const MemPointerRecordEx* mp2 = (const MemPointerRecordEx*)p2; | |
| 444 return UNSIGNED_COMPARE(mp1->pc(), mp2->pc()); | |
| 445 } | |
| 446 | |
| 447 // sort baselined malloc'd records in size order | |
| 448 int MemBaseline::bl_malloc_sort_by_size(const void* p1, const void* p2) { | |
| 449 assert(MemTracker::is_on(), "Just check"); | |
| 450 const MallocCallsitePointer* mp1 = (const MallocCallsitePointer*)p1; | |
| 451 const MallocCallsitePointer* mp2 = (const MallocCallsitePointer*)p2; | |
| 452 return UNSIGNED_COMPARE(mp2->amount(), mp1->amount()); | |
| 453 } | |
| 454 | |
| 455 // sort baselined malloc'd records in callsite pc order | |
| 456 int MemBaseline::bl_malloc_sort_by_pc(const void* p1, const void* p2) { | |
| 457 assert(MemTracker::is_on(), "Just check"); | |
| 458 const MallocCallsitePointer* mp1 = (const MallocCallsitePointer*)p1; | |
| 459 const MallocCallsitePointer* mp2 = (const MallocCallsitePointer*)p2; | |
| 460 return UNSIGNED_COMPARE(mp1->addr(), mp2->addr()); | |
| 461 } | |
| 462 | |
| 463 | |
| 464 // sort baselined mmap'd records in size (reserved size) order | |
| 465 int MemBaseline::bl_vm_sort_by_size(const void* p1, const void* p2) { | |
| 466 assert(MemTracker::is_on(), "Just check"); | |
| 467 const VMCallsitePointer* mp1 = (const VMCallsitePointer*)p1; | |
| 468 const VMCallsitePointer* mp2 = (const VMCallsitePointer*)p2; | |
| 469 return UNSIGNED_COMPARE(mp2->reserved_amount(), mp1->reserved_amount()); | |
| 470 } | |
| 471 | |
| 472 // sort baselined mmap'd records in callsite pc order | |
| 473 int MemBaseline::bl_vm_sort_by_pc(const void* p1, const void* p2) { | |
| 474 assert(MemTracker::is_on(), "Just check"); | |
| 475 const VMCallsitePointer* mp1 = (const VMCallsitePointer*)p1; | |
| 476 const VMCallsitePointer* mp2 = (const VMCallsitePointer*)p2; | |
| 477 return UNSIGNED_COMPARE(mp1->addr(), mp2->addr()); | |
| 478 } | |
| 479 | |
| 480 | |
| 481 // sort snapshot malloc'd records in memory block address order | |
| 482 int MemBaseline::malloc_sort_by_addr(const void* p1, const void* p2) { | |
| 483 assert(MemTracker::is_on(), "Just check"); | |
| 484 const MemPointerRecord* mp1 = (const MemPointerRecord*)p1; | |
| 485 const MemPointerRecord* mp2 = (const MemPointerRecord*)p2; | |
| 486 int delta = UNSIGNED_COMPARE(mp1->addr(), mp2->addr()); | |
| 487 assert(delta != 0, "dup pointer"); | |
| 488 return delta; | |
| 489 } | |
| 490 |