Mercurial > hg > truffle
annotate src/share/vm/services/memSnapshot.hpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | fb3190e77d3c |
children | 49cbd3e25ba9 |
rev | line source |
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6197 | 1 /* |
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. | |
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 | |
25 #ifndef SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP | |
26 #define SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "runtime/mutex.hpp" | |
30 #include "runtime/mutexLocker.hpp" | |
31 #include "services/memBaseline.hpp" | |
32 #include "services/memPtrArray.hpp" | |
33 | |
34 // Snapshot pointer array iterator | |
35 | |
36 // The pointer array contains malloc-ed pointers | |
37 class MemPointerIterator : public MemPointerArrayIteratorImpl { | |
38 public: | |
39 MemPointerIterator(MemPointerArray* arr): | |
40 MemPointerArrayIteratorImpl(arr) { | |
41 assert(arr != NULL, "null array"); | |
42 } | |
43 | |
44 #ifdef ASSERT | |
45 virtual bool is_dup_pointer(const MemPointer* ptr1, | |
46 const MemPointer* ptr2) const { | |
47 MemPointerRecord* p1 = (MemPointerRecord*)ptr1; | |
48 MemPointerRecord* p2 = (MemPointerRecord*)ptr2; | |
49 | |
50 if (p1->addr() != p2->addr()) return false; | |
51 if ((p1->flags() & MemPointerRecord::tag_masks) != | |
52 (p2->flags() & MemPointerRecord::tag_masks)) { | |
53 return false; | |
54 } | |
55 // we do see multiple commit/uncommit on the same memory, it is ok | |
56 return (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_alloc || | |
57 (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_release; | |
58 } | |
59 | |
60 virtual bool insert(MemPointer* ptr) { | |
61 if (_pos > 0) { | |
62 MemPointer* p1 = (MemPointer*)ptr; | |
63 MemPointer* p2 = (MemPointer*)_array->at(_pos - 1); | |
64 assert(!is_dup_pointer(p1, p2), | |
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65 err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
6197 | 66 } |
67 if (_pos < _array->length() -1) { | |
68 MemPointer* p1 = (MemPointer*)ptr; | |
69 MemPointer* p2 = (MemPointer*)_array->at(_pos + 1); | |
70 assert(!is_dup_pointer(p1, p2), | |
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71 err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
6197 | 72 } |
73 return _array->insert_at(ptr, _pos); | |
74 } | |
75 | |
76 virtual bool insert_after(MemPointer* ptr) { | |
77 if (_pos > 0) { | |
78 MemPointer* p1 = (MemPointer*)ptr; | |
79 MemPointer* p2 = (MemPointer*)_array->at(_pos - 1); | |
80 assert(!is_dup_pointer(p1, p2), | |
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81 err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
6197 | 82 } |
83 if (_pos < _array->length() - 1) { | |
84 MemPointer* p1 = (MemPointer*)ptr; | |
85 MemPointer* p2 = (MemPointer*)_array->at(_pos + 1); | |
86 | |
87 assert(!is_dup_pointer(p1, p2), | |
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88 err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
6197 | 89 } |
90 if (_array->insert_at(ptr, _pos + 1)) { | |
91 _pos ++; | |
92 return true; | |
93 } | |
94 return false; | |
95 } | |
96 #endif | |
97 | |
98 virtual MemPointer* locate(address addr) { | |
99 MemPointer* cur = current(); | |
100 while (cur != NULL && cur->addr() < addr) { | |
101 cur = next(); | |
102 } | |
103 return cur; | |
104 } | |
105 }; | |
106 | |
107 class VMMemPointerIterator : public MemPointerIterator { | |
108 public: | |
109 VMMemPointerIterator(MemPointerArray* arr): | |
110 MemPointerIterator(arr) { | |
111 } | |
112 | |
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113 // locate an existing reserved memory region that contains specified address, |
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114 // or the reserved region just above this address, where the incoming |
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115 // reserved region should be inserted. |
6197 | 116 virtual MemPointer* locate(address addr) { |
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117 reset(); |
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118 VMMemRegion* reg = (VMMemRegion*)current(); |
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119 while (reg != NULL) { |
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120 if (reg->is_reserved_region()) { |
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121 if (reg->contains_address(addr) || addr < reg->base()) { |
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122 return reg; |
6197 | 123 } |
124 } | |
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125 reg = (VMMemRegion*)next(); |
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126 } |
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127 return NULL; |
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128 } |
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129 |
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130 // following methods update virtual memory in the context |
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131 // of 'current' position, which is properly positioned by |
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132 // callers via locate method. |
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133 bool add_reserved_region(MemPointerRecord* rec); |
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134 bool add_committed_region(MemPointerRecord* rec); |
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135 bool remove_uncommitted_region(MemPointerRecord* rec); |
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136 bool remove_released_region(MemPointerRecord* rec); |
6197 | 137 |
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138 // split a reserved region to create a new memory region with specified base and size |
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139 bool split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size); |
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140 private: |
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141 bool insert_record(MemPointerRecord* rec); |
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142 bool insert_record_after(MemPointerRecord* rec); |
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143 |
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144 bool insert_reserved_region(MemPointerRecord* rec); |
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145 |
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146 // reset current position |
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147 inline void reset() { _pos = 0; } |
6197 | 148 #ifdef ASSERT |
149 virtual bool is_dup_pointer(const MemPointer* ptr1, | |
150 const MemPointer* ptr2) const { | |
151 VMMemRegion* p1 = (VMMemRegion*)ptr1; | |
152 VMMemRegion* p2 = (VMMemRegion*)ptr2; | |
153 | |
154 if (p1->addr() != p2->addr()) return false; | |
155 if ((p1->flags() & MemPointerRecord::tag_masks) != | |
156 (p2->flags() & MemPointerRecord::tag_masks)) { | |
157 return false; | |
158 } | |
159 // we do see multiple commit/uncommit on the same memory, it is ok | |
160 return (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_alloc || | |
161 (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_release; | |
162 } | |
163 #endif | |
164 }; | |
165 | |
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166 class MallocRecordIterator : public MemPointerArrayIterator { |
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167 private: |
6197 | 168 MemPointerArrayIteratorImpl _itr; |
169 | |
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170 |
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171 |
6197 | 172 public: |
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173 MallocRecordIterator(MemPointerArray* arr) : _itr(arr) { |
6197 | 174 } |
175 | |
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176 virtual MemPointer* current() const { |
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177 #ifdef ASSERT |
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178 MemPointer* cur_rec = _itr.current(); |
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179 if (cur_rec != NULL) { |
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180 MemPointer* prev_rec = _itr.peek_prev(); |
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181 MemPointer* next_rec = _itr.peek_next(); |
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182 assert(prev_rec == NULL || prev_rec->addr() < cur_rec->addr(), "Sorting order"); |
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183 assert(next_rec == NULL || next_rec->addr() > cur_rec->addr(), "Sorting order"); |
6197 | 184 } |
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185 #endif |
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186 return _itr.current(); |
6197 | 187 } |
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188 virtual MemPointer* next() { |
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189 MemPointerRecord* next_rec = (MemPointerRecord*)_itr.next(); |
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190 // arena memory record is a special case, which we have to compare |
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191 // sequence number against its associated arena record. |
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192 if (next_rec != NULL && next_rec->is_arena_memory_record()) { |
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193 MemPointerRecord* prev_rec = (MemPointerRecord*)_itr.peek_prev(); |
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194 // if there is an associated arena record, it has to be previous |
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195 // record because of sorting order (by address) - NMT generates a pseudo address |
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196 // for arena's size record by offsetting arena's address, that guarantees |
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197 // the order of arena record and it's size record. |
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198 if (prev_rec != NULL && prev_rec->is_arena_record() && |
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199 next_rec->is_memory_record_of_arena(prev_rec)) { |
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200 if (prev_rec->seq() > next_rec->seq()) { |
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201 // Skip this arena memory record |
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202 // Two scenarios: |
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203 // - if the arena record is an allocation record, this early |
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204 // size record must be leftover by previous arena, |
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205 // and the last size record should have size = 0. |
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206 // - if the arena record is a deallocation record, this |
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207 // size record should be its cleanup record, which should |
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208 // also have size = 0. In other world, arena alway reset |
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209 // its size before gone (see Arena's destructor) |
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210 assert(next_rec->size() == 0, "size not reset"); |
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211 return _itr.next(); |
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212 } else { |
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213 assert(prev_rec->is_allocation_record(), |
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214 "Arena size record ahead of allocation record"); |
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215 } |
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216 } |
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217 } |
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218 return next_rec; |
6197 | 219 } |
220 | |
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221 MemPointer* peek_next() const { ShouldNotReachHere(); return NULL; } |
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222 MemPointer* peek_prev() const { ShouldNotReachHere(); return NULL; } |
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223 void remove() { ShouldNotReachHere(); } |
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224 bool insert(MemPointer* ptr) { ShouldNotReachHere(); return false; } |
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225 bool insert_after(MemPointer* ptr) { ShouldNotReachHere(); return false; } |
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226 }; |
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227 |
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228 // collapse duplicated records. Eliminating duplicated records here, is much |
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229 // cheaper than during promotion phase. However, it does have limitation - it |
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230 // can only eliminate duplicated records within the generation, there are |
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231 // still chances seeing duplicated records during promotion. |
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232 // We want to use the record with higher sequence number, because it has |
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233 // more accurate callsite pc. |
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234 class VMRecordIterator : public MemPointerArrayIterator { |
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235 private: |
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236 MemPointerArrayIteratorImpl _itr; |
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237 |
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238 public: |
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239 VMRecordIterator(MemPointerArray* arr) : _itr(arr) { |
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240 MemPointerRecord* cur = (MemPointerRecord*)_itr.current(); |
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241 MemPointerRecord* next = (MemPointerRecord*)_itr.peek_next(); |
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242 while (next != NULL) { |
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243 assert(cur != NULL, "Sanity check"); |
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244 assert(((SeqMemPointerRecord*)next)->seq() > ((SeqMemPointerRecord*)cur)->seq(), |
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245 "pre-sort order"); |
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246 |
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247 if (is_duplicated_record(cur, next)) { |
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248 _itr.next(); |
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249 next = (MemPointerRecord*)_itr.peek_next(); |
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250 } else { |
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251 break; |
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252 } |
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253 } |
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254 } |
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255 |
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256 virtual MemPointer* current() const { |
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257 return _itr.current(); |
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258 } |
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259 |
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260 // get next record, but skip the duplicated records |
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261 virtual MemPointer* next() { |
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262 MemPointerRecord* cur = (MemPointerRecord*)_itr.next(); |
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263 MemPointerRecord* next = (MemPointerRecord*)_itr.peek_next(); |
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264 while (next != NULL) { |
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265 assert(cur != NULL, "Sanity check"); |
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266 assert(((SeqMemPointerRecord*)next)->seq() > ((SeqMemPointerRecord*)cur)->seq(), |
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267 "pre-sort order"); |
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268 |
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269 if (is_duplicated_record(cur, next)) { |
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270 _itr.next(); |
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271 cur = next; |
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272 next = (MemPointerRecord*)_itr.peek_next(); |
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273 } else { |
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274 break; |
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275 } |
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276 } |
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277 return cur; |
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278 } |
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279 |
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280 MemPointer* peek_next() const { ShouldNotReachHere(); return NULL; } |
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281 MemPointer* peek_prev() const { ShouldNotReachHere(); return NULL; } |
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282 void remove() { ShouldNotReachHere(); } |
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283 bool insert(MemPointer* ptr) { ShouldNotReachHere(); return false; } |
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284 bool insert_after(MemPointer* ptr) { ShouldNotReachHere(); return false; } |
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285 |
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286 private: |
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287 bool is_duplicated_record(MemPointerRecord* p1, MemPointerRecord* p2) const { |
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288 bool ret = (p1->addr() == p2->addr() && p1->size() == p2->size() && p1->flags() == p2->flags()); |
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289 assert(!(ret && FLAGS_TO_MEMORY_TYPE(p1->flags()) == mtThreadStack), "dup on stack record"); |
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290 return ret; |
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291 } |
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292 }; |
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293 |
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294 class StagingArea : public _ValueObj { |
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295 private: |
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296 MemPointerArray* _malloc_data; |
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297 MemPointerArray* _vm_data; |
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298 |
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299 public: |
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300 StagingArea() : _malloc_data(NULL), _vm_data(NULL) { |
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301 init(); |
6197 | 302 } |
303 | |
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304 ~StagingArea() { |
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305 if (_malloc_data != NULL) delete _malloc_data; |
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306 if (_vm_data != NULL) delete _vm_data; |
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307 } |
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308 |
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309 MallocRecordIterator malloc_record_walker() { |
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310 return MallocRecordIterator(malloc_data()); |
6197 | 311 } |
312 | |
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313 VMRecordIterator virtual_memory_record_walker(); |
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314 |
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315 bool init(); |
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316 void clear() { |
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317 assert(_malloc_data != NULL && _vm_data != NULL, "Just check"); |
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318 _malloc_data->shrink(); |
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319 _malloc_data->clear(); |
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320 _vm_data->clear(); |
6197 | 321 } |
322 | |
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323 inline MemPointerArray* malloc_data() { return _malloc_data; } |
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324 inline MemPointerArray* vm_data() { return _vm_data; } |
6197 | 325 }; |
326 | |
327 class MemBaseline; | |
328 class MemSnapshot : public CHeapObj<mtNMT> { | |
329 private: | |
330 // the following two arrays contain records of all known lived memory blocks | |
331 // live malloc-ed memory pointers | |
332 MemPointerArray* _alloc_ptrs; | |
333 // live virtual memory pointers | |
334 MemPointerArray* _vm_ptrs; | |
335 | |
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336 StagingArea _staging_area; |
6197 | 337 |
338 // the lock to protect this snapshot | |
339 Monitor* _lock; | |
340 | |
341 NOT_PRODUCT(size_t _untracked_count;) | |
342 friend class MemBaseline; | |
343 | |
344 public: | |
345 MemSnapshot(); | |
346 virtual ~MemSnapshot(); | |
347 | |
348 // if we are running out of native memory | |
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349 bool out_of_memory() { |
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350 return (_alloc_ptrs == NULL || |
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351 _staging_area.malloc_data() == NULL || |
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352 _staging_area.vm_data() == NULL || |
6197 | 353 _vm_ptrs == NULL || _lock == NULL || |
354 _alloc_ptrs->out_of_memory() || | |
355 _vm_ptrs->out_of_memory()); | |
356 } | |
357 | |
358 // merge a per-thread memory recorder into staging area | |
359 bool merge(MemRecorder* rec); | |
360 // promote staged data to snapshot | |
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361 bool promote(); |
6197 | 362 |
363 | |
364 void wait(long timeout) { | |
365 assert(_lock != NULL, "Just check"); | |
366 MonitorLockerEx locker(_lock); | |
367 locker.wait(true, timeout); | |
368 } | |
369 | |
370 NOT_PRODUCT(void print_snapshot_stats(outputStream* st);) | |
371 NOT_PRODUCT(void check_staging_data();) | |
372 NOT_PRODUCT(void check_malloc_pointers();) | |
373 NOT_PRODUCT(bool has_allocation_record(address addr);) | |
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374 // dump all virtual memory pointers in snapshot |
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375 DEBUG_ONLY( void dump_all_vm_pointers();) |
6197 | 376 |
377 private: | |
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378 // copy sequenced pointer from src to dest |
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379 void copy_seq_pointer(MemPointerRecord* dest, const MemPointerRecord* src); |
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380 // assign a sequenced pointer to non-sequenced pointer |
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381 void assign_pointer(MemPointerRecord*dest, const MemPointerRecord* src); |
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382 |
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383 bool promote_malloc_records(MemPointerArrayIterator* itr); |
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384 bool promote_virtual_memory_records(MemPointerArrayIterator* itr); |
6197 | 385 }; |
386 | |
387 #endif // SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP |