Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/shared/mutableNUMASpace.cpp @ 17771:9fdaa79b0c27
8036703: Add trace event with statistics for the metaspace chunk free lists
Reviewed-by: stefank, mgerdin, coleenp, egahlin
author | ehelin |
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date | Fri, 21 Mar 2014 10:31:51 +0100 |
parents | cfd4aac53239 |
children | 78bbf4d43a14 |
rev | line source |
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0 | 1 |
2 /* | |
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3 * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
5 * | |
6 * This code is free software; you can redistribute it and/or modify it | |
7 * under the terms of the GNU General Public License version 2 only, as | |
8 * published by the Free Software Foundation. | |
9 * | |
10 * This code is distributed in the hope that it will be useful, but WITHOUT | |
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 * version 2 for more details (a copy is included in the LICENSE file that | |
14 * accompanied this code). | |
15 * | |
16 * You should have received a copy of the GNU General Public License version | |
17 * 2 along with this work; if not, write to the Free Software Foundation, | |
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 * | |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
0 | 23 * |
24 */ | |
25 | |
1972 | 26 #include "precompiled.hpp" |
27 #include "gc_implementation/shared/mutableNUMASpace.hpp" | |
28 #include "gc_implementation/shared/spaceDecorator.hpp" | |
29 #include "memory/sharedHeap.hpp" | |
30 #include "oops/oop.inline.hpp" | |
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31 #include "runtime/thread.inline.hpp" |
0 | 32 |
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33 MutableNUMASpace::MutableNUMASpace(size_t alignment) : MutableSpace(alignment) { |
6197 | 34 _lgrp_spaces = new (ResourceObj::C_HEAP, mtGC) GrowableArray<LGRPSpace*>(0, true); |
0 | 35 _page_size = os::vm_page_size(); |
36 _adaptation_cycles = 0; | |
37 _samples_count = 0; | |
38 update_layout(true); | |
39 } | |
40 | |
41 MutableNUMASpace::~MutableNUMASpace() { | |
42 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
43 delete lgrp_spaces()->at(i); | |
44 } | |
45 delete lgrp_spaces(); | |
46 } | |
47 | |
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48 #ifndef PRODUCT |
0 | 49 void MutableNUMASpace::mangle_unused_area() { |
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50 // This method should do nothing. |
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51 // It can be called on a numa space during a full compaction. |
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52 } |
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53 void MutableNUMASpace::mangle_unused_area_complete() { |
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54 // This method should do nothing. |
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55 // It can be called on a numa space during a full compaction. |
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56 } |
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57 void MutableNUMASpace::mangle_region(MemRegion mr) { |
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58 // This method should do nothing because numa spaces are not mangled. |
0 | 59 } |
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60 void MutableNUMASpace::set_top_for_allocations(HeapWord* v) { |
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61 assert(false, "Do not mangle MutableNUMASpace's"); |
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62 } |
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63 void MutableNUMASpace::set_top_for_allocations() { |
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64 // This method should do nothing. |
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65 } |
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66 void MutableNUMASpace::check_mangled_unused_area(HeapWord* limit) { |
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67 // This method should do nothing. |
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68 } |
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69 void MutableNUMASpace::check_mangled_unused_area_complete() { |
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70 // This method should do nothing. |
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71 } |
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72 #endif // NOT_PRODUCT |
0 | 73 |
74 // There may be unallocated holes in the middle chunks | |
75 // that should be filled with dead objects to ensure parseability. | |
76 void MutableNUMASpace::ensure_parsability() { | |
77 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
78 LGRPSpace *ls = lgrp_spaces()->at(i); | |
79 MutableSpace *s = ls->space(); | |
605 | 80 if (s->top() < top()) { // For all spaces preceding the one containing top() |
0 | 81 if (s->free_in_words() > 0) { |
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82 intptr_t cur_top = (intptr_t)s->top(); |
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83 size_t words_left_to_fill = pointer_delta(s->end(), s->top());; |
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84 while (words_left_to_fill > 0) { |
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85 size_t words_to_fill = MIN2(words_left_to_fill, CollectedHeap::filler_array_max_size()); |
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86 assert(words_to_fill >= CollectedHeap::min_fill_size(), |
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87 err_msg("Remaining size ("SIZE_FORMAT ") is too small to fill (based on " SIZE_FORMAT " and " SIZE_FORMAT ")", |
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88 words_to_fill, words_left_to_fill, CollectedHeap::filler_array_max_size())); |
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89 CollectedHeap::fill_with_object((HeapWord*)cur_top, words_to_fill); |
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90 if (!os::numa_has_static_binding()) { |
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91 size_t touched_words = words_to_fill; |
0 | 92 #ifndef ASSERT |
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93 if (!ZapUnusedHeapArea) { |
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94 touched_words = MIN2((size_t)align_object_size(typeArrayOopDesc::header_size(T_INT)), |
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95 touched_words); |
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96 } |
0 | 97 #endif |
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98 MemRegion invalid; |
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99 HeapWord *crossing_start = (HeapWord*)round_to(cur_top, os::vm_page_size()); |
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100 HeapWord *crossing_end = (HeapWord*)round_to(cur_top + touched_words, os::vm_page_size()); |
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101 if (crossing_start != crossing_end) { |
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102 // If object header crossed a small page boundary we mark the area |
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103 // as invalid rounding it to a page_size(). |
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104 HeapWord *start = MAX2((HeapWord*)round_down(cur_top, page_size()), s->bottom()); |
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105 HeapWord *end = MIN2((HeapWord*)round_to(cur_top + touched_words, page_size()), s->end()); |
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106 invalid = MemRegion(start, end); |
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107 } |
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108 |
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109 ls->add_invalid_region(invalid); |
141 | 110 } |
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111 cur_top = cur_top + (words_to_fill * HeapWordSize); |
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112 words_left_to_fill -= words_to_fill; |
0 | 113 } |
114 } | |
115 } else { | |
141 | 116 if (!os::numa_has_static_binding()) { |
0 | 117 #ifdef ASSERT |
118 MemRegion invalid(s->top(), s->end()); | |
119 ls->add_invalid_region(invalid); | |
141 | 120 #else |
121 if (ZapUnusedHeapArea) { | |
122 MemRegion invalid(s->top(), s->end()); | |
123 ls->add_invalid_region(invalid); | |
144
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124 } else { |
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125 return; |
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126 } |
0 | 127 #endif |
144
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128 } else { |
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129 return; |
141 | 130 } |
0 | 131 } |
132 } | |
133 } | |
134 | |
135 size_t MutableNUMASpace::used_in_words() const { | |
136 size_t s = 0; | |
137 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
138 s += lgrp_spaces()->at(i)->space()->used_in_words(); | |
139 } | |
140 return s; | |
141 } | |
142 | |
143 size_t MutableNUMASpace::free_in_words() const { | |
144 size_t s = 0; | |
145 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
146 s += lgrp_spaces()->at(i)->space()->free_in_words(); | |
147 } | |
148 return s; | |
149 } | |
150 | |
151 | |
152 size_t MutableNUMASpace::tlab_capacity(Thread *thr) const { | |
153 guarantee(thr != NULL, "No thread"); | |
154 int lgrp_id = thr->lgrp_id(); | |
268
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155 if (lgrp_id == -1) { |
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156 // This case can occur after the topology of the system has |
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157 // changed. Thread can change their location, the new home |
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158 // group will be determined during the first allocation |
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159 // attempt. For now we can safely assume that all spaces |
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160 // have equal size because the whole space will be reinitialized. |
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161 if (lgrp_spaces()->length() > 0) { |
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162 return capacity_in_bytes() / lgrp_spaces()->length(); |
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163 } else { |
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164 assert(false, "There should be at least one locality group"); |
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165 return 0; |
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166 } |
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167 } |
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168 // That's the normal case, where we know the locality group of the thread. |
0 | 169 int i = lgrp_spaces()->find(&lgrp_id, LGRPSpace::equals); |
170 if (i == -1) { | |
171 return 0; | |
172 } | |
173 return lgrp_spaces()->at(i)->space()->capacity_in_bytes(); | |
174 } | |
175 | |
17727 | 176 size_t MutableNUMASpace::tlab_used(Thread *thr) const { |
177 // Please see the comments for tlab_capacity(). | |
178 guarantee(thr != NULL, "No thread"); | |
179 int lgrp_id = thr->lgrp_id(); | |
180 if (lgrp_id == -1) { | |
181 if (lgrp_spaces()->length() > 0) { | |
182 return (used_in_bytes()) / lgrp_spaces()->length(); | |
183 } else { | |
184 assert(false, "There should be at least one locality group"); | |
185 return 0; | |
186 } | |
187 } | |
188 int i = lgrp_spaces()->find(&lgrp_id, LGRPSpace::equals); | |
189 if (i == -1) { | |
190 return 0; | |
191 } | |
192 return lgrp_spaces()->at(i)->space()->used_in_bytes(); | |
193 } | |
194 | |
195 | |
0 | 196 size_t MutableNUMASpace::unsafe_max_tlab_alloc(Thread *thr) const { |
268
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197 // Please see the comments for tlab_capacity(). |
0 | 198 guarantee(thr != NULL, "No thread"); |
199 int lgrp_id = thr->lgrp_id(); | |
268
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200 if (lgrp_id == -1) { |
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201 if (lgrp_spaces()->length() > 0) { |
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202 return free_in_bytes() / lgrp_spaces()->length(); |
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203 } else { |
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204 assert(false, "There should be at least one locality group"); |
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205 return 0; |
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206 } |
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207 } |
0 | 208 int i = lgrp_spaces()->find(&lgrp_id, LGRPSpace::equals); |
209 if (i == -1) { | |
210 return 0; | |
211 } | |
212 return lgrp_spaces()->at(i)->space()->free_in_bytes(); | |
213 } | |
214 | |
373
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215 |
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216 size_t MutableNUMASpace::capacity_in_words(Thread* thr) const { |
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217 guarantee(thr != NULL, "No thread"); |
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218 int lgrp_id = thr->lgrp_id(); |
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219 if (lgrp_id == -1) { |
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220 if (lgrp_spaces()->length() > 0) { |
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221 return capacity_in_words() / lgrp_spaces()->length(); |
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222 } else { |
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223 assert(false, "There should be at least one locality group"); |
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224 return 0; |
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225 } |
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226 } |
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227 int i = lgrp_spaces()->find(&lgrp_id, LGRPSpace::equals); |
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228 if (i == -1) { |
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229 return 0; |
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230 } |
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231 return lgrp_spaces()->at(i)->space()->capacity_in_words(); |
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232 } |
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233 |
0 | 234 // Check if the NUMA topology has changed. Add and remove spaces if needed. |
235 // The update can be forced by setting the force parameter equal to true. | |
236 bool MutableNUMASpace::update_layout(bool force) { | |
237 // Check if the topology had changed. | |
238 bool changed = os::numa_topology_changed(); | |
239 if (force || changed) { | |
240 // Compute lgrp intersection. Add/remove spaces. | |
241 int lgrp_limit = (int)os::numa_get_groups_num(); | |
6197 | 242 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtGC); |
0 | 243 int lgrp_num = (int)os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); |
244 assert(lgrp_num > 0, "There should be at least one locality group"); | |
245 // Add new spaces for the new nodes | |
246 for (int i = 0; i < lgrp_num; i++) { | |
247 bool found = false; | |
248 for (int j = 0; j < lgrp_spaces()->length(); j++) { | |
249 if (lgrp_spaces()->at(j)->lgrp_id() == lgrp_ids[i]) { | |
250 found = true; | |
251 break; | |
252 } | |
253 } | |
254 if (!found) { | |
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255 lgrp_spaces()->append(new LGRPSpace(lgrp_ids[i], alignment())); |
0 | 256 } |
257 } | |
258 | |
259 // Remove spaces for the removed nodes. | |
260 for (int i = 0; i < lgrp_spaces()->length();) { | |
261 bool found = false; | |
262 for (int j = 0; j < lgrp_num; j++) { | |
263 if (lgrp_spaces()->at(i)->lgrp_id() == lgrp_ids[j]) { | |
264 found = true; | |
265 break; | |
266 } | |
267 } | |
268 if (!found) { | |
269 delete lgrp_spaces()->at(i); | |
270 lgrp_spaces()->remove_at(i); | |
271 } else { | |
272 i++; | |
273 } | |
274 } | |
275 | |
6197 | 276 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtGC); |
0 | 277 |
278 if (changed) { | |
279 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
280 thread->set_lgrp_id(-1); | |
281 } | |
282 } | |
283 return true; | |
284 } | |
285 return false; | |
286 } | |
287 | |
288 // Bias region towards the first-touching lgrp. Set the right page sizes. | |
141 | 289 void MutableNUMASpace::bias_region(MemRegion mr, int lgrp_id) { |
0 | 290 HeapWord *start = (HeapWord*)round_to((intptr_t)mr.start(), page_size()); |
291 HeapWord *end = (HeapWord*)round_down((intptr_t)mr.end(), page_size()); | |
292 if (end > start) { | |
293 MemRegion aligned_region(start, end); | |
294 assert((intptr_t)aligned_region.start() % page_size() == 0 && | |
295 (intptr_t)aligned_region.byte_size() % page_size() == 0, "Bad alignment"); | |
296 assert(region().contains(aligned_region), "Sanity"); | |
141 | 297 // First we tell the OS which page size we want in the given range. The underlying |
298 // large page can be broken down if we require small pages. | |
0 | 299 os::realign_memory((char*)aligned_region.start(), aligned_region.byte_size(), page_size()); |
141 | 300 // Then we uncommit the pages in the range. |
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301 os::free_memory((char*)aligned_region.start(), aligned_region.byte_size(), page_size()); |
141 | 302 // And make them local/first-touch biased. |
303 os::numa_make_local((char*)aligned_region.start(), aligned_region.byte_size(), lgrp_id); | |
0 | 304 } |
305 } | |
306 | |
307 // Free all pages in the region. | |
308 void MutableNUMASpace::free_region(MemRegion mr) { | |
309 HeapWord *start = (HeapWord*)round_to((intptr_t)mr.start(), page_size()); | |
310 HeapWord *end = (HeapWord*)round_down((intptr_t)mr.end(), page_size()); | |
311 if (end > start) { | |
312 MemRegion aligned_region(start, end); | |
313 assert((intptr_t)aligned_region.start() % page_size() == 0 && | |
314 (intptr_t)aligned_region.byte_size() % page_size() == 0, "Bad alignment"); | |
315 assert(region().contains(aligned_region), "Sanity"); | |
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316 os::free_memory((char*)aligned_region.start(), aligned_region.byte_size(), page_size()); |
0 | 317 } |
318 } | |
319 | |
320 // Update space layout. Perform adaptation. | |
321 void MutableNUMASpace::update() { | |
322 if (update_layout(false)) { | |
323 // If the topology has changed, make all chunks zero-sized. | |
268
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324 // And clear the alloc-rate statistics. |
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325 // In future we may want to handle this more gracefully in order |
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326 // to avoid the reallocation of the pages as much as possible. |
0 | 327 for (int i = 0; i < lgrp_spaces()->length(); i++) { |
268
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328 LGRPSpace *ls = lgrp_spaces()->at(i); |
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329 MutableSpace *s = ls->space(); |
0 | 330 s->set_end(s->bottom()); |
331 s->set_top(s->bottom()); | |
268
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332 ls->clear_alloc_rate(); |
0 | 333 } |
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334 // A NUMA space is never mangled |
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335 initialize(region(), |
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336 SpaceDecorator::Clear, |
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337 SpaceDecorator::DontMangle); |
0 | 338 } else { |
339 bool should_initialize = false; | |
141 | 340 if (!os::numa_has_static_binding()) { |
341 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
342 if (!lgrp_spaces()->at(i)->invalid_region().is_empty()) { | |
343 should_initialize = true; | |
344 break; | |
345 } | |
0 | 346 } |
347 } | |
348 | |
349 if (should_initialize || | |
350 (UseAdaptiveNUMAChunkSizing && adaptation_cycles() < samples_count())) { | |
263
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351 // A NUMA space is never mangled |
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352 initialize(region(), |
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353 SpaceDecorator::Clear, |
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354 SpaceDecorator::DontMangle); |
0 | 355 } |
356 } | |
357 | |
358 if (NUMAStats) { | |
359 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
360 lgrp_spaces()->at(i)->accumulate_statistics(page_size()); | |
361 } | |
362 } | |
363 | |
364 scan_pages(NUMAPageScanRate); | |
365 } | |
366 | |
367 // Scan pages. Free pages that have smaller size or wrong placement. | |
368 void MutableNUMASpace::scan_pages(size_t page_count) | |
369 { | |
370 size_t pages_per_chunk = page_count / lgrp_spaces()->length(); | |
371 if (pages_per_chunk > 0) { | |
372 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
373 LGRPSpace *ls = lgrp_spaces()->at(i); | |
374 ls->scan_pages(page_size(), pages_per_chunk); | |
375 } | |
376 } | |
377 } | |
378 | |
379 // Accumulate statistics about the allocation rate of each lgrp. | |
380 void MutableNUMASpace::accumulate_statistics() { | |
381 if (UseAdaptiveNUMAChunkSizing) { | |
382 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
383 lgrp_spaces()->at(i)->sample(); | |
384 } | |
385 increment_samples_count(); | |
386 } | |
387 | |
388 if (NUMAStats) { | |
389 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
390 lgrp_spaces()->at(i)->accumulate_statistics(page_size()); | |
391 } | |
392 } | |
393 } | |
394 | |
395 // Get the current size of a chunk. | |
396 // This function computes the size of the chunk based on the | |
397 // difference between chunk ends. This allows it to work correctly in | |
398 // case the whole space is resized and during the process of adaptive | |
399 // chunk resizing. | |
400 size_t MutableNUMASpace::current_chunk_size(int i) { | |
401 HeapWord *cur_end, *prev_end; | |
402 if (i == 0) { | |
403 prev_end = bottom(); | |
404 } else { | |
405 prev_end = lgrp_spaces()->at(i - 1)->space()->end(); | |
406 } | |
407 if (i == lgrp_spaces()->length() - 1) { | |
408 cur_end = end(); | |
409 } else { | |
410 cur_end = lgrp_spaces()->at(i)->space()->end(); | |
411 } | |
412 if (cur_end > prev_end) { | |
413 return pointer_delta(cur_end, prev_end, sizeof(char)); | |
414 } | |
415 return 0; | |
416 } | |
417 | |
418 // Return the default chunk size by equally diving the space. | |
419 // page_size() aligned. | |
420 size_t MutableNUMASpace::default_chunk_size() { | |
421 return base_space_size() / lgrp_spaces()->length() * page_size(); | |
422 } | |
423 | |
424 // Produce a new chunk size. page_size() aligned. | |
391
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425 // This function is expected to be called on sequence of i's from 0 to |
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426 // lgrp_spaces()->length(). |
0 | 427 size_t MutableNUMASpace::adaptive_chunk_size(int i, size_t limit) { |
428 size_t pages_available = base_space_size(); | |
429 for (int j = 0; j < i; j++) { | |
430 pages_available -= round_down(current_chunk_size(j), page_size()) / page_size(); | |
431 } | |
432 pages_available -= lgrp_spaces()->length() - i - 1; | |
433 assert(pages_available > 0, "No pages left"); | |
434 float alloc_rate = 0; | |
435 for (int j = i; j < lgrp_spaces()->length(); j++) { | |
436 alloc_rate += lgrp_spaces()->at(j)->alloc_rate()->average(); | |
437 } | |
438 size_t chunk_size = 0; | |
439 if (alloc_rate > 0) { | |
440 LGRPSpace *ls = lgrp_spaces()->at(i); | |
391
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441 chunk_size = (size_t)(ls->alloc_rate()->average() / alloc_rate * pages_available) * page_size(); |
0 | 442 } |
443 chunk_size = MAX2(chunk_size, page_size()); | |
444 | |
445 if (limit > 0) { | |
446 limit = round_down(limit, page_size()); | |
447 if (chunk_size > current_chunk_size(i)) { | |
462
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448 size_t upper_bound = pages_available * page_size(); |
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449 if (upper_bound > limit && |
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450 current_chunk_size(i) < upper_bound - limit) { |
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451 // The resulting upper bound should not exceed the available |
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452 // amount of memory (pages_available * page_size()). |
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453 upper_bound = current_chunk_size(i) + limit; |
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454 } |
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455 chunk_size = MIN2(chunk_size, upper_bound); |
0 | 456 } else { |
462
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457 size_t lower_bound = page_size(); |
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458 if (current_chunk_size(i) > limit) { // lower_bound shouldn't underflow. |
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459 lower_bound = current_chunk_size(i) - limit; |
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460 } |
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461 chunk_size = MAX2(chunk_size, lower_bound); |
0 | 462 } |
463 } | |
464 assert(chunk_size <= pages_available * page_size(), "Chunk size out of range"); | |
465 return chunk_size; | |
466 } | |
467 | |
468 | |
469 // Return the bottom_region and the top_region. Align them to page_size() boundary. | |
470 // |------------------new_region---------------------------------| | |
471 // |----bottom_region--|---intersection---|------top_region------| | |
472 void MutableNUMASpace::select_tails(MemRegion new_region, MemRegion intersection, | |
473 MemRegion* bottom_region, MemRegion *top_region) { | |
474 // Is there bottom? | |
475 if (new_region.start() < intersection.start()) { // Yes | |
476 // Try to coalesce small pages into a large one. | |
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477 if (UseLargePages && page_size() >= alignment()) { |
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478 HeapWord* p = (HeapWord*)round_to((intptr_t) intersection.start(), alignment()); |
0 | 479 if (new_region.contains(p) |
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480 && pointer_delta(p, new_region.start(), sizeof(char)) >= alignment()) { |
0 | 481 if (intersection.contains(p)) { |
482 intersection = MemRegion(p, intersection.end()); | |
483 } else { | |
484 intersection = MemRegion(p, p); | |
485 } | |
486 } | |
487 } | |
488 *bottom_region = MemRegion(new_region.start(), intersection.start()); | |
489 } else { | |
490 *bottom_region = MemRegion(); | |
491 } | |
492 | |
493 // Is there top? | |
494 if (intersection.end() < new_region.end()) { // Yes | |
495 // Try to coalesce small pages into a large one. | |
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496 if (UseLargePages && page_size() >= alignment()) { |
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497 HeapWord* p = (HeapWord*)round_down((intptr_t) intersection.end(), alignment()); |
0 | 498 if (new_region.contains(p) |
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499 && pointer_delta(new_region.end(), p, sizeof(char)) >= alignment()) { |
0 | 500 if (intersection.contains(p)) { |
501 intersection = MemRegion(intersection.start(), p); | |
502 } else { | |
503 intersection = MemRegion(p, p); | |
504 } | |
505 } | |
506 } | |
507 *top_region = MemRegion(intersection.end(), new_region.end()); | |
508 } else { | |
509 *top_region = MemRegion(); | |
510 } | |
511 } | |
512 | |
513 // Try to merge the invalid region with the bottom or top region by decreasing | |
514 // the intersection area. Return the invalid_region aligned to the page_size() | |
515 // boundary if it's inside the intersection. Return non-empty invalid_region | |
516 // if it lies inside the intersection (also page-aligned). | |
517 // |------------------new_region---------------------------------| | |
518 // |----------------|-------invalid---|--------------------------| | |
519 // |----bottom_region--|---intersection---|------top_region------| | |
520 void MutableNUMASpace::merge_regions(MemRegion new_region, MemRegion* intersection, | |
521 MemRegion *invalid_region) { | |
522 if (intersection->start() >= invalid_region->start() && intersection->contains(invalid_region->end())) { | |
523 *intersection = MemRegion(invalid_region->end(), intersection->end()); | |
524 *invalid_region = MemRegion(); | |
525 } else | |
526 if (intersection->end() <= invalid_region->end() && intersection->contains(invalid_region->start())) { | |
527 *intersection = MemRegion(intersection->start(), invalid_region->start()); | |
528 *invalid_region = MemRegion(); | |
529 } else | |
530 if (intersection->equals(*invalid_region) || invalid_region->contains(*intersection)) { | |
531 *intersection = MemRegion(new_region.start(), new_region.start()); | |
532 *invalid_region = MemRegion(); | |
533 } else | |
534 if (intersection->contains(invalid_region)) { | |
535 // That's the only case we have to make an additional bias_region() call. | |
536 HeapWord* start = invalid_region->start(); | |
537 HeapWord* end = invalid_region->end(); | |
535
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538 if (UseLargePages && page_size() >= alignment()) { |
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539 HeapWord *p = (HeapWord*)round_down((intptr_t) start, alignment()); |
0 | 540 if (new_region.contains(p)) { |
541 start = p; | |
542 } | |
535
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543 p = (HeapWord*)round_to((intptr_t) end, alignment()); |
0 | 544 if (new_region.contains(end)) { |
545 end = p; | |
546 } | |
547 } | |
548 if (intersection->start() > start) { | |
549 *intersection = MemRegion(start, intersection->end()); | |
550 } | |
551 if (intersection->end() < end) { | |
552 *intersection = MemRegion(intersection->start(), end); | |
553 } | |
554 *invalid_region = MemRegion(start, end); | |
555 } | |
556 } | |
557 | |
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558 void MutableNUMASpace::initialize(MemRegion mr, |
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559 bool clear_space, |
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560 bool mangle_space, |
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561 bool setup_pages) { |
0 | 562 assert(clear_space, "Reallocation will destory data!"); |
563 assert(lgrp_spaces()->length() > 0, "There should be at least one space"); | |
564 | |
565 MemRegion old_region = region(), new_region; | |
566 set_bottom(mr.start()); | |
567 set_end(mr.end()); | |
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568 // Must always clear the space |
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569 clear(SpaceDecorator::DontMangle); |
0 | 570 |
571 // Compute chunk sizes | |
572 size_t prev_page_size = page_size(); | |
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573 set_page_size(UseLargePages ? alignment() : os::vm_page_size()); |
0 | 574 HeapWord* rounded_bottom = (HeapWord*)round_to((intptr_t) bottom(), page_size()); |
575 HeapWord* rounded_end = (HeapWord*)round_down((intptr_t) end(), page_size()); | |
576 size_t base_space_size_pages = pointer_delta(rounded_end, rounded_bottom, sizeof(char)) / page_size(); | |
577 | |
578 // Try small pages if the chunk size is too small | |
579 if (base_space_size_pages / lgrp_spaces()->length() == 0 | |
580 && page_size() > (size_t)os::vm_page_size()) { | |
581 set_page_size(os::vm_page_size()); | |
582 rounded_bottom = (HeapWord*)round_to((intptr_t) bottom(), page_size()); | |
583 rounded_end = (HeapWord*)round_down((intptr_t) end(), page_size()); | |
584 base_space_size_pages = pointer_delta(rounded_end, rounded_bottom, sizeof(char)) / page_size(); | |
585 } | |
586 guarantee(base_space_size_pages / lgrp_spaces()->length() > 0, "Space too small"); | |
587 set_base_space_size(base_space_size_pages); | |
588 | |
589 // Handle space resize | |
590 MemRegion top_region, bottom_region; | |
591 if (!old_region.equals(region())) { | |
592 new_region = MemRegion(rounded_bottom, rounded_end); | |
593 MemRegion intersection = new_region.intersection(old_region); | |
594 if (intersection.start() == NULL || | |
595 intersection.end() == NULL || | |
596 prev_page_size > page_size()) { // If the page size got smaller we have to change | |
597 // the page size preference for the whole space. | |
598 intersection = MemRegion(new_region.start(), new_region.start()); | |
599 } | |
600 select_tails(new_region, intersection, &bottom_region, &top_region); | |
141 | 601 bias_region(bottom_region, lgrp_spaces()->at(0)->lgrp_id()); |
602 bias_region(top_region, lgrp_spaces()->at(lgrp_spaces()->length() - 1)->lgrp_id()); | |
0 | 603 } |
604 | |
605 // Check if the space layout has changed significantly? | |
606 // This happens when the space has been resized so that either head or tail | |
607 // chunk became less than a page. | |
608 bool layout_valid = UseAdaptiveNUMAChunkSizing && | |
609 current_chunk_size(0) > page_size() && | |
610 current_chunk_size(lgrp_spaces()->length() - 1) > page_size(); | |
611 | |
612 | |
613 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
614 LGRPSpace *ls = lgrp_spaces()->at(i); | |
615 MutableSpace *s = ls->space(); | |
616 old_region = s->region(); | |
617 | |
618 size_t chunk_byte_size = 0, old_chunk_byte_size = 0; | |
619 if (i < lgrp_spaces()->length() - 1) { | |
620 if (!UseAdaptiveNUMAChunkSizing || | |
621 (UseAdaptiveNUMAChunkSizing && NUMAChunkResizeWeight == 0) || | |
622 samples_count() < AdaptiveSizePolicyReadyThreshold) { | |
623 // No adaptation. Divide the space equally. | |
624 chunk_byte_size = default_chunk_size(); | |
625 } else | |
626 if (!layout_valid || NUMASpaceResizeRate == 0) { | |
627 // Fast adaptation. If no space resize rate is set, resize | |
628 // the chunks instantly. | |
629 chunk_byte_size = adaptive_chunk_size(i, 0); | |
630 } else { | |
631 // Slow adaptation. Resize the chunks moving no more than | |
632 // NUMASpaceResizeRate bytes per collection. | |
633 size_t limit = NUMASpaceResizeRate / | |
634 (lgrp_spaces()->length() * (lgrp_spaces()->length() + 1) / 2); | |
635 chunk_byte_size = adaptive_chunk_size(i, MAX2(limit * (i + 1), page_size())); | |
636 } | |
637 | |
638 assert(chunk_byte_size >= page_size(), "Chunk size too small"); | |
639 assert(chunk_byte_size <= capacity_in_bytes(), "Sanity check"); | |
640 } | |
641 | |
642 if (i == 0) { // Bottom chunk | |
643 if (i != lgrp_spaces()->length() - 1) { | |
644 new_region = MemRegion(bottom(), rounded_bottom + (chunk_byte_size >> LogHeapWordSize)); | |
645 } else { | |
646 new_region = MemRegion(bottom(), end()); | |
647 } | |
648 } else | |
649 if (i < lgrp_spaces()->length() - 1) { // Middle chunks | |
650 MutableSpace *ps = lgrp_spaces()->at(i - 1)->space(); | |
651 new_region = MemRegion(ps->end(), | |
652 ps->end() + (chunk_byte_size >> LogHeapWordSize)); | |
653 } else { // Top chunk | |
654 MutableSpace *ps = lgrp_spaces()->at(i - 1)->space(); | |
655 new_region = MemRegion(ps->end(), end()); | |
656 } | |
657 guarantee(region().contains(new_region), "Region invariant"); | |
658 | |
659 | |
660 // The general case: | |
661 // |---------------------|--invalid---|--------------------------| | |
662 // |------------------new_region---------------------------------| | |
663 // |----bottom_region--|---intersection---|------top_region------| | |
664 // |----old_region----| | |
665 // The intersection part has all pages in place we don't need to migrate them. | |
666 // Pages for the top and bottom part should be freed and then reallocated. | |
667 | |
668 MemRegion intersection = old_region.intersection(new_region); | |
669 | |
670 if (intersection.start() == NULL || intersection.end() == NULL) { | |
671 intersection = MemRegion(new_region.start(), new_region.start()); | |
672 } | |
673 | |
141 | 674 if (!os::numa_has_static_binding()) { |
675 MemRegion invalid_region = ls->invalid_region().intersection(new_region); | |
676 // Invalid region is a range of memory that could've possibly | |
677 // been allocated on the other node. That's relevant only on Solaris where | |
678 // there is no static memory binding. | |
679 if (!invalid_region.is_empty()) { | |
680 merge_regions(new_region, &intersection, &invalid_region); | |
681 free_region(invalid_region); | |
682 ls->set_invalid_region(MemRegion()); | |
683 } | |
0 | 684 } |
141 | 685 |
0 | 686 select_tails(new_region, intersection, &bottom_region, &top_region); |
141 | 687 |
688 if (!os::numa_has_static_binding()) { | |
689 // If that's a system with the first-touch policy then it's enough | |
690 // to free the pages. | |
691 free_region(bottom_region); | |
692 free_region(top_region); | |
693 } else { | |
694 // In a system with static binding we have to change the bias whenever | |
695 // we reshape the heap. | |
696 bias_region(bottom_region, ls->lgrp_id()); | |
697 bias_region(top_region, ls->lgrp_id()); | |
698 } | |
0 | 699 |
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700 // Clear space (set top = bottom) but never mangle. |
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701 s->initialize(new_region, SpaceDecorator::Clear, SpaceDecorator::DontMangle, MutableSpace::DontSetupPages); |
0 | 702 |
703 set_adaptation_cycles(samples_count()); | |
704 } | |
705 } | |
706 | |
707 // Set the top of the whole space. | |
708 // Mark the the holes in chunks below the top() as invalid. | |
709 void MutableNUMASpace::set_top(HeapWord* value) { | |
710 bool found_top = false; | |
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711 for (int i = 0; i < lgrp_spaces()->length();) { |
0 | 712 LGRPSpace *ls = lgrp_spaces()->at(i); |
713 MutableSpace *s = ls->space(); | |
714 HeapWord *top = MAX2((HeapWord*)round_down((intptr_t)s->top(), page_size()), s->bottom()); | |
715 | |
716 if (s->contains(value)) { | |
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717 // Check if setting the chunk's top to a given value would create a hole less than |
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718 // a minimal object; assuming that's not the last chunk in which case we don't care. |
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719 if (i < lgrp_spaces()->length() - 1) { |
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720 size_t remainder = pointer_delta(s->end(), value); |
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721 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
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722 if (remainder < min_fill_size && remainder > 0) { |
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723 // Add a minimum size filler object; it will cross the chunk boundary. |
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724 CollectedHeap::fill_with_object(value, min_fill_size); |
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725 value += min_fill_size; |
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726 assert(!s->contains(value), "Should be in the next chunk"); |
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727 // Restart the loop from the same chunk, since the value has moved |
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728 // to the next one. |
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729 continue; |
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730 } |
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731 } |
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732 |
141 | 733 if (!os::numa_has_static_binding() && top < value && top < s->end()) { |
0 | 734 ls->add_invalid_region(MemRegion(top, value)); |
735 } | |
736 s->set_top(value); | |
737 found_top = true; | |
738 } else { | |
739 if (found_top) { | |
740 s->set_top(s->bottom()); | |
741 } else { | |
141 | 742 if (!os::numa_has_static_binding() && top < s->end()) { |
743 ls->add_invalid_region(MemRegion(top, s->end())); | |
744 } | |
745 s->set_top(s->end()); | |
0 | 746 } |
747 } | |
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748 i++; |
0 | 749 } |
750 MutableSpace::set_top(value); | |
751 } | |
752 | |
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753 void MutableNUMASpace::clear(bool mangle_space) { |
0 | 754 MutableSpace::set_top(bottom()); |
755 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
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756 // Never mangle NUMA spaces because the mangling will |
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757 // bind the memory to a possibly unwanted lgroup. |
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758 lgrp_spaces()->at(i)->space()->clear(SpaceDecorator::DontMangle); |
0 | 759 } |
760 } | |
761 | |
141 | 762 /* |
763 Linux supports static memory binding, therefore the most part of the | |
764 logic dealing with the possible invalid page allocation is effectively | |
765 disabled. Besides there is no notion of the home node in Linux. A | |
766 thread is allowed to migrate freely. Although the scheduler is rather | |
767 reluctant to move threads between the nodes. We check for the current | |
768 node every allocation. And with a high probability a thread stays on | |
769 the same node for some time allowing local access to recently allocated | |
770 objects. | |
771 */ | |
772 | |
0 | 773 HeapWord* MutableNUMASpace::allocate(size_t size) { |
141 | 774 Thread* thr = Thread::current(); |
775 int lgrp_id = thr->lgrp_id(); | |
776 if (lgrp_id == -1 || !os::numa_has_group_homing()) { | |
0 | 777 lgrp_id = os::numa_get_group_id(); |
141 | 778 thr->set_lgrp_id(lgrp_id); |
0 | 779 } |
780 | |
781 int i = lgrp_spaces()->find(&lgrp_id, LGRPSpace::equals); | |
782 | |
783 // It is possible that a new CPU has been hotplugged and | |
784 // we haven't reshaped the space accordingly. | |
785 if (i == -1) { | |
786 i = os::random() % lgrp_spaces()->length(); | |
787 } | |
788 | |
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789 LGRPSpace* ls = lgrp_spaces()->at(i); |
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790 MutableSpace *s = ls->space(); |
0 | 791 HeapWord *p = s->allocate(size); |
792 | |
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793 if (p != NULL) { |
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794 size_t remainder = s->free_in_words(); |
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795 if (remainder < CollectedHeap::min_fill_size() && remainder > 0) { |
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796 s->set_top(s->top() - size); |
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797 p = NULL; |
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798 } |
0 | 799 } |
800 if (p != NULL) { | |
801 if (top() < s->top()) { // Keep _top updated. | |
802 MutableSpace::set_top(s->top()); | |
803 } | |
804 } | |
141 | 805 // Make the page allocation happen here if there is no static binding.. |
806 if (p != NULL && !os::numa_has_static_binding()) { | |
0 | 807 for (HeapWord *i = p; i < p + size; i += os::vm_page_size() >> LogHeapWordSize) { |
808 *(int*)i = 0; | |
809 } | |
810 } | |
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811 if (p == NULL) { |
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812 ls->set_allocation_failed(); |
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813 } |
0 | 814 return p; |
815 } | |
816 | |
817 // This version is lock-free. | |
818 HeapWord* MutableNUMASpace::cas_allocate(size_t size) { | |
141 | 819 Thread* thr = Thread::current(); |
820 int lgrp_id = thr->lgrp_id(); | |
821 if (lgrp_id == -1 || !os::numa_has_group_homing()) { | |
0 | 822 lgrp_id = os::numa_get_group_id(); |
141 | 823 thr->set_lgrp_id(lgrp_id); |
0 | 824 } |
825 | |
826 int i = lgrp_spaces()->find(&lgrp_id, LGRPSpace::equals); | |
827 // It is possible that a new CPU has been hotplugged and | |
828 // we haven't reshaped the space accordingly. | |
829 if (i == -1) { | |
830 i = os::random() % lgrp_spaces()->length(); | |
831 } | |
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832 LGRPSpace *ls = lgrp_spaces()->at(i); |
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833 MutableSpace *s = ls->space(); |
0 | 834 HeapWord *p = s->cas_allocate(size); |
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835 if (p != NULL) { |
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836 size_t remainder = pointer_delta(s->end(), p + size); |
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837 if (remainder < CollectedHeap::min_fill_size() && remainder > 0) { |
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838 if (s->cas_deallocate(p, size)) { |
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839 // We were the last to allocate and created a fragment less than |
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840 // a minimal object. |
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841 p = NULL; |
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842 } else { |
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843 guarantee(false, "Deallocation should always succeed"); |
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844 } |
0 | 845 } |
846 } | |
847 if (p != NULL) { | |
848 HeapWord* cur_top, *cur_chunk_top = p + size; | |
849 while ((cur_top = top()) < cur_chunk_top) { // Keep _top updated. | |
850 if (Atomic::cmpxchg_ptr(cur_chunk_top, top_addr(), cur_top) == cur_top) { | |
851 break; | |
852 } | |
853 } | |
854 } | |
855 | |
141 | 856 // Make the page allocation happen here if there is no static binding. |
857 if (p != NULL && !os::numa_has_static_binding() ) { | |
0 | 858 for (HeapWord *i = p; i < p + size; i += os::vm_page_size() >> LogHeapWordSize) { |
859 *(int*)i = 0; | |
860 } | |
861 } | |
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862 if (p == NULL) { |
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863 ls->set_allocation_failed(); |
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864 } |
0 | 865 return p; |
866 } | |
867 | |
868 void MutableNUMASpace::print_short_on(outputStream* st) const { | |
869 MutableSpace::print_short_on(st); | |
870 st->print(" ("); | |
871 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
872 st->print("lgrp %d: ", lgrp_spaces()->at(i)->lgrp_id()); | |
873 lgrp_spaces()->at(i)->space()->print_short_on(st); | |
874 if (i < lgrp_spaces()->length() - 1) { | |
875 st->print(", "); | |
876 } | |
877 } | |
878 st->print(")"); | |
879 } | |
880 | |
881 void MutableNUMASpace::print_on(outputStream* st) const { | |
882 MutableSpace::print_on(st); | |
883 for (int i = 0; i < lgrp_spaces()->length(); i++) { | |
884 LGRPSpace *ls = lgrp_spaces()->at(i); | |
885 st->print(" lgrp %d", ls->lgrp_id()); | |
886 ls->space()->print_on(st); | |
887 if (NUMAStats) { | |
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888 for (int i = 0; i < lgrp_spaces()->length(); i++) { |
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889 lgrp_spaces()->at(i)->accumulate_statistics(page_size()); |
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890 } |
0 | 891 st->print(" local/remote/unbiased/uncommitted: %dK/%dK/%dK/%dK, large/small pages: %d/%d\n", |
892 ls->space_stats()->_local_space / K, | |
893 ls->space_stats()->_remote_space / K, | |
894 ls->space_stats()->_unbiased_space / K, | |
895 ls->space_stats()->_uncommited_space / K, | |
896 ls->space_stats()->_large_pages, | |
897 ls->space_stats()->_small_pages); | |
898 } | |
899 } | |
900 } | |
901 | |
6008 | 902 void MutableNUMASpace::verify() { |
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903 // This can be called after setting an arbitary value to the space's top, |
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904 // so an object can cross the chunk boundary. We ensure the parsablity |
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905 // of the space and just walk the objects in linear fashion. |
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906 ensure_parsability(); |
6008 | 907 MutableSpace::verify(); |
0 | 908 } |
909 | |
910 // Scan pages and gather stats about page placement and size. | |
911 void MutableNUMASpace::LGRPSpace::accumulate_statistics(size_t page_size) { | |
912 clear_space_stats(); | |
913 char *start = (char*)round_to((intptr_t) space()->bottom(), page_size); | |
914 char* end = (char*)round_down((intptr_t) space()->end(), page_size); | |
915 if (start < end) { | |
916 for (char *p = start; p < end;) { | |
917 os::page_info info; | |
918 if (os::get_page_info(p, &info)) { | |
919 if (info.size > 0) { | |
920 if (info.size > (size_t)os::vm_page_size()) { | |
921 space_stats()->_large_pages++; | |
922 } else { | |
923 space_stats()->_small_pages++; | |
924 } | |
925 if (info.lgrp_id == lgrp_id()) { | |
926 space_stats()->_local_space += info.size; | |
927 } else { | |
928 space_stats()->_remote_space += info.size; | |
929 } | |
930 p += info.size; | |
931 } else { | |
932 p += os::vm_page_size(); | |
933 space_stats()->_uncommited_space += os::vm_page_size(); | |
934 } | |
935 } else { | |
936 return; | |
937 } | |
938 } | |
939 } | |
940 space_stats()->_unbiased_space = pointer_delta(start, space()->bottom(), sizeof(char)) + | |
941 pointer_delta(space()->end(), end, sizeof(char)); | |
942 | |
943 } | |
944 | |
945 // Scan page_count pages and verify if they have the right size and right placement. | |
946 // If invalid pages are found they are freed in hope that subsequent reallocation | |
947 // will be more successful. | |
948 void MutableNUMASpace::LGRPSpace::scan_pages(size_t page_size, size_t page_count) | |
949 { | |
950 char* range_start = (char*)round_to((intptr_t) space()->bottom(), page_size); | |
951 char* range_end = (char*)round_down((intptr_t) space()->end(), page_size); | |
952 | |
953 if (range_start > last_page_scanned() || last_page_scanned() >= range_end) { | |
954 set_last_page_scanned(range_start); | |
955 } | |
956 | |
957 char *scan_start = last_page_scanned(); | |
958 char* scan_end = MIN2(scan_start + page_size * page_count, range_end); | |
959 | |
960 os::page_info page_expected, page_found; | |
961 page_expected.size = page_size; | |
962 page_expected.lgrp_id = lgrp_id(); | |
963 | |
964 char *s = scan_start; | |
965 while (s < scan_end) { | |
966 char *e = os::scan_pages(s, (char*)scan_end, &page_expected, &page_found); | |
967 if (e == NULL) { | |
968 break; | |
969 } | |
970 if (e != scan_end) { | |
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971 assert(e < scan_end, err_msg("e: " PTR_FORMAT " scan_end: " PTR_FORMAT, e, scan_end)); |
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972 |
0 | 973 if ((page_expected.size != page_size || page_expected.lgrp_id != lgrp_id()) |
974 && page_expected.size != 0) { | |
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975 os::free_memory(s, pointer_delta(e, s, sizeof(char)), page_size); |
0 | 976 } |
977 page_expected = page_found; | |
978 } | |
979 s = e; | |
980 } | |
981 | |
982 set_last_page_scanned(scan_end); | |
983 } |