Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/mutableSpace.cpp @ 1562:dfe27f03244a
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
parents | c18cbe5936b8 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2009, 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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_mutableSpace.cpp.incl" | |
27 | |
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28 MutableSpace::MutableSpace(size_t alignment): ImmutableSpace(), _top(NULL), _alignment(alignment) { |
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29 assert(MutableSpace::alignment() >= 0 && |
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30 MutableSpace::alignment() % os::vm_page_size() == 0, |
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31 "Space should be aligned"); |
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32 _mangler = new MutableSpaceMangler(this); |
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33 } |
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34 |
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35 MutableSpace::~MutableSpace() { |
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36 delete _mangler; |
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37 } |
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38 |
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39 void MutableSpace::numa_setup_pages(MemRegion mr, bool clear_space) { |
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40 if (!mr.is_empty()) { |
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41 size_t page_size = UseLargePages ? alignment() : os::vm_page_size(); |
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42 HeapWord *start = (HeapWord*)round_to((intptr_t) mr.start(), page_size); |
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43 HeapWord *end = (HeapWord*)round_down((intptr_t) mr.end(), page_size); |
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44 if (end > start) { |
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45 size_t size = pointer_delta(end, start, sizeof(char)); |
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46 if (clear_space) { |
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47 // Prefer page reallocation to migration. |
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48 os::free_memory((char*)start, size); |
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49 } |
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50 os::numa_make_global((char*)start, size); |
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51 } |
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52 } |
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53 } |
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54 |
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55 void MutableSpace::pretouch_pages(MemRegion mr) { |
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56 for (volatile char *p = (char*)mr.start(); p < (char*)mr.end(); p += os::vm_page_size()) { |
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57 char t = *p; *p = t; |
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58 } |
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59 } |
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60 |
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61 void MutableSpace::initialize(MemRegion mr, |
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62 bool clear_space, |
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63 bool mangle_space, |
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64 bool setup_pages) { |
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65 |
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66 assert(Universe::on_page_boundary(mr.start()) && Universe::on_page_boundary(mr.end()), |
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67 "invalid space boundaries"); |
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69 if (setup_pages && (UseNUMA || AlwaysPreTouch)) { |
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70 // The space may move left and right or expand/shrink. |
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71 // We'd like to enforce the desired page placement. |
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72 MemRegion head, tail; |
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73 if (last_setup_region().is_empty()) { |
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74 // If it's the first initialization don't limit the amount of work. |
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75 head = mr; |
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76 tail = MemRegion(mr.end(), mr.end()); |
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77 } else { |
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78 // Is there an intersection with the address space? |
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79 MemRegion intersection = last_setup_region().intersection(mr); |
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80 if (intersection.is_empty()) { |
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81 intersection = MemRegion(mr.end(), mr.end()); |
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82 } |
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83 // All the sizes below are in words. |
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84 size_t head_size = 0, tail_size = 0; |
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85 if (mr.start() <= intersection.start()) { |
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86 head_size = pointer_delta(intersection.start(), mr.start()); |
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87 } |
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88 if(intersection.end() <= mr.end()) { |
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89 tail_size = pointer_delta(mr.end(), intersection.end()); |
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90 } |
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91 // Limit the amount of page manipulation if necessary. |
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92 if (NUMASpaceResizeRate > 0 && !AlwaysPreTouch) { |
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93 const size_t change_size = head_size + tail_size; |
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94 const float setup_rate_words = NUMASpaceResizeRate >> LogBytesPerWord; |
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95 head_size = MIN2((size_t)(setup_rate_words * head_size / change_size), |
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96 head_size); |
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97 tail_size = MIN2((size_t)(setup_rate_words * tail_size / change_size), |
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98 tail_size); |
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99 } |
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100 head = MemRegion(intersection.start() - head_size, intersection.start()); |
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101 tail = MemRegion(intersection.end(), intersection.end() + tail_size); |
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102 } |
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103 assert(mr.contains(head) && mr.contains(tail), "Sanity"); |
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104 |
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105 if (UseNUMA) { |
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106 numa_setup_pages(head, clear_space); |
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107 numa_setup_pages(tail, clear_space); |
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108 } |
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109 |
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110 if (AlwaysPreTouch) { |
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111 pretouch_pages(head); |
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112 pretouch_pages(tail); |
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113 } |
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114 |
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115 // Remember where we stopped so that we can continue later. |
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116 set_last_setup_region(MemRegion(head.start(), tail.end())); |
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117 } |
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118 |
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119 set_bottom(mr.start()); |
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120 set_end(mr.end()); |
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122 if (clear_space) { |
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123 clear(mangle_space); |
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124 } |
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125 } |
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126 |
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127 void MutableSpace::clear(bool mangle_space) { |
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128 set_top(bottom()); |
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129 if (ZapUnusedHeapArea && mangle_space) { |
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130 mangle_unused_area(); |
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131 } |
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132 } |
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133 |
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134 #ifndef PRODUCT |
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135 void MutableSpace::check_mangled_unused_area(HeapWord* limit) { |
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136 mangler()->check_mangled_unused_area(limit); |
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137 } |
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138 |
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139 void MutableSpace::check_mangled_unused_area_complete() { |
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140 mangler()->check_mangled_unused_area_complete(); |
0 | 141 } |
142 | |
263
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143 // Mangle only the unused space that has not previously |
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144 // been mangled and that has not been allocated since being |
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145 // mangled. |
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146 void MutableSpace::mangle_unused_area() { |
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147 mangler()->mangle_unused_area(); |
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148 } |
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149 |
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150 void MutableSpace::mangle_unused_area_complete() { |
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151 mangler()->mangle_unused_area_complete(); |
0 | 152 } |
153 | |
263
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154 void MutableSpace::mangle_region(MemRegion mr) { |
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155 SpaceMangler::mangle_region(mr); |
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156 } |
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157 |
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158 void MutableSpace::set_top_for_allocations(HeapWord* v) { |
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159 mangler()->set_top_for_allocations(v); |
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160 } |
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161 |
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162 void MutableSpace::set_top_for_allocations() { |
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163 mangler()->set_top_for_allocations(top()); |
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164 } |
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165 #endif |
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166 |
0 | 167 // This version requires locking. */ |
168 HeapWord* MutableSpace::allocate(size_t size) { | |
169 assert(Heap_lock->owned_by_self() || | |
170 (SafepointSynchronize::is_at_safepoint() && | |
171 Thread::current()->is_VM_thread()), | |
172 "not locked"); | |
173 HeapWord* obj = top(); | |
174 if (pointer_delta(end(), obj) >= size) { | |
175 HeapWord* new_top = obj + size; | |
176 set_top(new_top); | |
177 assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top), | |
178 "checking alignment"); | |
179 return obj; | |
180 } else { | |
181 return NULL; | |
182 } | |
183 } | |
184 | |
185 // This version is lock-free. | |
186 HeapWord* MutableSpace::cas_allocate(size_t size) { | |
187 do { | |
188 HeapWord* obj = top(); | |
189 if (pointer_delta(end(), obj) >= size) { | |
190 HeapWord* new_top = obj + size; | |
191 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); | |
192 // result can be one of two: | |
193 // the old top value: the exchange succeeded | |
194 // otherwise: the new value of the top is returned. | |
195 if (result != obj) { | |
196 continue; // another thread beat us to the allocation, try again | |
197 } | |
198 assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top), | |
199 "checking alignment"); | |
200 return obj; | |
201 } else { | |
202 return NULL; | |
203 } | |
204 } while (true); | |
205 } | |
206 | |
207 // Try to deallocate previous allocation. Returns true upon success. | |
208 bool MutableSpace::cas_deallocate(HeapWord *obj, size_t size) { | |
209 HeapWord* expected_top = obj + size; | |
210 return (HeapWord*)Atomic::cmpxchg_ptr(obj, top_addr(), expected_top) == expected_top; | |
211 } | |
212 | |
213 void MutableSpace::oop_iterate(OopClosure* cl) { | |
214 HeapWord* obj_addr = bottom(); | |
215 HeapWord* t = top(); | |
216 // Could call objects iterate, but this is easier. | |
217 while (obj_addr < t) { | |
218 obj_addr += oop(obj_addr)->oop_iterate(cl); | |
219 } | |
220 } | |
221 | |
222 void MutableSpace::object_iterate(ObjectClosure* cl) { | |
223 HeapWord* p = bottom(); | |
224 while (p < top()) { | |
225 cl->do_object(oop(p)); | |
226 p += oop(p)->size(); | |
227 } | |
228 } | |
229 | |
230 void MutableSpace::print_short() const { print_short_on(tty); } | |
231 void MutableSpace::print_short_on( outputStream* st) const { | |
232 st->print(" space " SIZE_FORMAT "K, %d%% used", capacity_in_bytes() / K, | |
233 (int) ((double) used_in_bytes() * 100 / capacity_in_bytes())); | |
234 } | |
235 | |
236 void MutableSpace::print() const { print_on(tty); } | |
237 void MutableSpace::print_on(outputStream* st) const { | |
238 MutableSpace::print_short_on(st); | |
239 st->print_cr(" [" INTPTR_FORMAT "," INTPTR_FORMAT "," INTPTR_FORMAT ")", | |
240 bottom(), top(), end()); | |
241 } | |
242 | |
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243 void MutableSpace::verify(bool allow_dirty) { |
0 | 244 HeapWord* p = bottom(); |
245 HeapWord* t = top(); | |
246 HeapWord* prev_p = NULL; | |
247 while (p < t) { | |
248 oop(p)->verify(); | |
249 prev_p = p; | |
250 p += oop(p)->size(); | |
251 } | |
252 guarantee(p == top(), "end of last object must match end of space"); | |
253 } |