Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionSet.hpp @ 17736:58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
Reviewed-by: tschatzl, pliden
| author | brutisso |
|---|---|
| date | Fri, 14 Mar 2014 10:15:46 +0100 |
| parents | a2f7274eb6ef |
| children | 8ee855b4e667 |
| rev | line source |
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| 2152 | 1 /* |
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| 2152 | 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_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP | |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/heapRegion.hpp" | |
| 29 | |
| 30 // Large buffer for some cases where the output might be larger than normal. | |
| 2361 | 31 #define HRS_ERR_MSG_BUFSZ 512 |
| 32 typedef FormatBuffer<HRS_ERR_MSG_BUFSZ> hrs_err_msg; | |
| 2152 | 33 |
| 34 // Set verification will be forced either if someone defines | |
| 35 // HEAP_REGION_SET_FORCE_VERIFY to be 1, or in builds in which | |
| 36 // asserts are compiled in. | |
| 37 #ifndef HEAP_REGION_SET_FORCE_VERIFY | |
| 38 #define HEAP_REGION_SET_FORCE_VERIFY defined(ASSERT) | |
| 39 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 40 | |
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41 class hrs_ext_msg; |
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42 |
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43 class HRSMtSafeChecker : public CHeapObj<mtGC> { |
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44 public: |
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45 virtual void check() = 0; |
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46 }; |
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47 |
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48 class MasterFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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49 class SecondaryFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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50 class HumongousRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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51 class OldRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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52 |
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53 class HeapRegionSetCount VALUE_OBJ_CLASS_SPEC { |
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54 friend class VMStructs; |
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55 uint _length; |
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56 size_t _capacity; |
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57 |
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58 public: |
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59 HeapRegionSetCount() : _length(0), _capacity(0) { } |
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60 |
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61 const uint length() const { return _length; } |
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62 const size_t capacity() const { return _capacity; } |
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63 |
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64 void increment(uint length_to_add, size_t capacity_to_add) { |
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65 _length += length_to_add; |
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66 _capacity += capacity_to_add; |
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67 } |
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68 |
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69 void decrement(const uint length_to_remove, const size_t capacity_to_remove) { |
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70 _length -= length_to_remove; |
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71 _capacity -= capacity_to_remove; |
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72 } |
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73 }; |
| 2152 | 74 |
| 75 // Base class for all the classes that represent heap region sets. It | |
| 76 // contains the basic attributes that each set needs to maintain | |
| 77 // (e.g., length, region num, used bytes sum) plus any shared | |
| 78 // functionality (e.g., verification). | |
| 79 | |
| 80 class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC { | |
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81 friend class VMStructs; |
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82 private: |
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83 bool _is_humongous; |
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84 bool _is_empty; |
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85 HRSMtSafeChecker* _mt_safety_checker; |
| 2152 | 86 |
| 87 protected: | |
| 88 // The number of regions added to the set. If the set contains | |
| 89 // only humongous regions, this reflects only 'starts humongous' | |
| 90 // regions and does not include 'continues humongous' ones. | |
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91 HeapRegionSetCount _count; |
| 2152 | 92 |
| 93 const char* _name; | |
| 94 | |
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95 bool _verify_in_progress; |
| 4072 | 96 |
| 2152 | 97 // verify_region() is used to ensure that the contents of a region |
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98 // added to / removed from a set are consistent. |
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99 void verify_region(HeapRegion* hr) PRODUCT_RETURN; |
| 2152 | 100 |
| 101 // Indicates whether all regions in the set should be humongous or | |
| 102 // not. Only used during verification. | |
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103 bool regions_humongous() { return _is_humongous; } |
| 2152 | 104 |
| 105 // Indicates whether all regions in the set should be empty or | |
| 106 // not. Only used during verification. | |
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107 bool regions_empty() { return _is_empty; } |
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108 |
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109 void check_mt_safety() { |
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110 if (_mt_safety_checker != NULL) { |
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111 _mt_safety_checker->check(); |
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112 } |
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113 } |
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114 |
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115 virtual void fill_in_ext_msg_extra(hrs_ext_msg* msg) { } |
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116 |
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117 HeapRegionSetBase(const char* name, bool humongous, bool empty, HRSMtSafeChecker* mt_safety_checker); |
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118 |
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119 public: |
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120 const char* name() { return _name; } |
| 2152 | 121 |
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122 uint length() { return _count.length(); } |
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123 |
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124 bool is_empty() { return _count.length() == 0; } |
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125 |
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126 size_t total_capacity_bytes() { |
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127 return _count.capacity(); |
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128 } |
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129 |
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130 // It updates the fields of the set to reflect hr being added to |
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131 // the set and tags the region appropriately. |
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132 inline void add(HeapRegion* hr); |
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133 |
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134 // It updates the fields of the set to reflect hr being removed |
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135 // from the set and tags the region appropriately. |
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136 inline void remove(HeapRegion* hr); |
| 2152 | 137 |
| 138 // fill_in_ext_msg() writes the the values of the set's attributes | |
| 2361 | 139 // in the custom err_msg (hrs_ext_msg). fill_in_ext_msg_extra() |
| 2152 | 140 // allows subclasses to append further information. |
| 2361 | 141 void fill_in_ext_msg(hrs_ext_msg* msg, const char* message); |
| 2152 | 142 |
| 143 virtual void verify(); | |
| 144 void verify_start(); | |
| 145 void verify_next_region(HeapRegion* hr); | |
| 146 void verify_end(); | |
| 147 | |
| 148 #if HEAP_REGION_SET_FORCE_VERIFY | |
| 149 void verify_optional() { | |
| 150 verify(); | |
| 151 } | |
| 152 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 153 void verify_optional() { } | |
| 154 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 155 | |
| 156 virtual void print_on(outputStream* out, bool print_contents = false); | |
| 157 }; | |
| 158 | |
| 159 // Customized err_msg for heap region sets. Apart from a | |
| 160 // assert/guarantee-specific message it also prints out the values of | |
| 161 // the fields of the associated set. This can be very helpful in | |
| 162 // diagnosing failures. | |
| 2361 | 163 class hrs_ext_msg : public hrs_err_msg { |
| 2152 | 164 public: |
| 2361 | 165 hrs_ext_msg(HeapRegionSetBase* set, const char* message) : hrs_err_msg("") { |
| 2152 | 166 set->fill_in_ext_msg(this, message); |
| 167 } | |
| 168 }; | |
| 169 | |
| 2361 | 170 #define hrs_assert_sets_match(_set1_, _set2_) \ |
| 2152 | 171 do { \ |
| 172 assert(((_set1_)->regions_humongous() == \ | |
| 173 (_set2_)->regions_humongous()) && \ | |
| 174 ((_set1_)->regions_empty() == (_set2_)->regions_empty()), \ | |
| 2361 | 175 hrs_err_msg("the contents of set %s and set %s should match", \ |
| 2152 | 176 (_set1_)->name(), (_set2_)->name())); \ |
| 177 } while (0) | |
| 178 | |
| 179 // This class represents heap region sets whose members are not | |
| 180 // explicitly tracked. It's helpful to group regions using such sets | |
| 181 // so that we can reason about all the region groups in the heap using | |
| 182 // the same interface (namely, the HeapRegionSetBase API). | |
| 183 | |
| 184 class HeapRegionSet : public HeapRegionSetBase { | |
| 185 public: | |
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186 HeapRegionSet(const char* name, bool humongous, HRSMtSafeChecker* mt_safety_checker): |
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187 HeapRegionSetBase(name, humongous, false /* empty */, mt_safety_checker) { } |
| 2152 | 188 |
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189 void bulk_remove(const HeapRegionSetCount& removed) { |
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190 _count.decrement(removed.length(), removed.capacity()); |
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191 } |
| 2152 | 192 }; |
| 193 | |
| 194 // A set that links all the regions added to it in a singly-linked | |
| 195 // list. We should try to avoid doing operations that iterate over | |
| 196 // such lists in performance critical paths. Typically we should | |
| 197 // add / remove one region at a time or concatenate two lists. All | |
| 198 // those operations are done in constant time. | |
| 199 | |
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200 class FreeRegionListIterator; |
| 2152 | 201 |
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202 class FreeRegionList : public HeapRegionSetBase { |
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203 friend class FreeRegionListIterator; |
| 2152 | 204 |
| 205 private: | |
| 206 HeapRegion* _head; | |
| 207 HeapRegion* _tail; | |
| 208 | |
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209 static uint _unrealistically_long_length; |
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210 |
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211 void add_as_head_or_tail(FreeRegionList* from_list, bool as_head); |
| 2152 | 212 |
| 213 protected: | |
| 2361 | 214 virtual void fill_in_ext_msg_extra(hrs_ext_msg* msg); |
| 2152 | 215 |
| 216 // See the comment for HeapRegionSetBase::clear() | |
| 217 virtual void clear(); | |
| 218 | |
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219 public: |
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220 FreeRegionList(const char* name, HRSMtSafeChecker* mt_safety_checker = NULL): |
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221 HeapRegionSetBase(name, false /* humongous */, true /* empty */, mt_safety_checker) { |
| 2152 | 222 clear(); |
| 223 } | |
| 224 | |
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225 void verify_list(); |
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226 |
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227 HeapRegion* head() { return _head; } |
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228 HeapRegion* tail() { return _tail; } |
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229 |
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230 static void set_unrealistically_long_length(uint len); |
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231 |
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232 // It adds hr to the list as the new head. The region should not be |
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233 // a member of another set. |
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234 inline void add_as_head(HeapRegion* hr); |
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235 |
| 2152 | 236 // It adds hr to the list as the new tail. The region should not be |
| 237 // a member of another set. | |
| 238 inline void add_as_tail(HeapRegion* hr); | |
| 239 | |
| 240 // It removes and returns the head of the list. It assumes that the | |
| 241 // list is not empty so it will return a non-NULL value. | |
| 242 inline HeapRegion* remove_head(); | |
| 243 | |
| 244 // Convenience method. | |
| 245 inline HeapRegion* remove_head_or_null(); | |
| 246 | |
| 247 // It moves the regions from from_list to this list and empties | |
| 248 // from_list. The new regions will appear in the same order as they | |
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249 // were in from_list and be linked in the beginning of this list. |
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250 void add_as_head(FreeRegionList* from_list); |
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251 |
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252 // It moves the regions from from_list to this list and empties |
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253 // from_list. The new regions will appear in the same order as they |
| 2152 | 254 // were in from_list and be linked in the end of this list. |
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255 void add_as_tail(FreeRegionList* from_list); |
| 2152 | 256 |
| 257 // It empties the list by removing all regions from it. | |
| 258 void remove_all(); | |
| 259 | |
| 260 // It removes all regions in the list that are pending for removal | |
| 261 // (i.e., they have been tagged with "pending_removal"). The list | |
| 262 // must not be empty, target_count should reflect the exact number | |
| 263 // of regions that are pending for removal in the list, and | |
| 264 // target_count should be > 1 (currently, we never need to remove a | |
| 265 // single region using this). | |
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266 void remove_all_pending(uint target_count); |
| 2152 | 267 |
| 268 virtual void verify(); | |
| 269 | |
| 270 virtual void print_on(outputStream* out, bool print_contents = false); | |
| 271 }; | |
| 272 | |
| 2361 | 273 // Iterator class that provides a convenient way to iterate over the |
| 274 // regions of a HeapRegionLinkedList instance. | |
| 2152 | 275 |
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276 class FreeRegionListIterator : public StackObj { |
| 2152 | 277 private: |
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278 FreeRegionList* _list; |
| 2152 | 279 HeapRegion* _curr; |
| 280 | |
| 281 public: | |
| 282 bool more_available() { | |
| 283 return _curr != NULL; | |
| 284 } | |
| 285 | |
| 286 HeapRegion* get_next() { | |
| 287 assert(more_available(), | |
| 288 "get_next() should be called when more regions are available"); | |
| 289 | |
| 290 // If we are going to introduce a count in the iterator we should | |
| 291 // do the "cycle" check. | |
| 292 | |
| 293 HeapRegion* hr = _curr; | |
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294 _list->verify_region(hr); |
| 2152 | 295 _curr = hr->next(); |
| 296 return hr; | |
| 297 } | |
| 298 | |
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299 FreeRegionListIterator(FreeRegionList* list) |
| 2152 | 300 : _curr(NULL), _list(list) { |
| 301 _curr = list->head(); | |
| 302 } | |
| 303 }; | |
| 304 | |
| 305 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP |