Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionSeq.cpp @ 20337:1f1d373cd044
8038423: G1: Decommit memory within heap
Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps.
Reviewed-by: mgerdin, brutisso, jwilhelm
author | tschatzl |
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date | Thu, 21 Aug 2014 11:47:10 +0200 |
parents | 6701abbc4441 |
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rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
3766 | 26 #include "gc_implementation/g1/heapRegion.hpp" |
27 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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28 #include "gc_implementation/g1/heapRegionSet.inline.hpp" |
1972 | 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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30 #include "gc_implementation/g1/concurrentG1Refine.hpp" |
1972 | 31 #include "memory/allocation.hpp" |
342 | 32 |
20337 | 33 void HeapRegionSeq::initialize(G1RegionToSpaceMapper* heap_storage, |
34 G1RegionToSpaceMapper* prev_bitmap, | |
35 G1RegionToSpaceMapper* next_bitmap, | |
36 G1RegionToSpaceMapper* bot, | |
37 G1RegionToSpaceMapper* cardtable, | |
38 G1RegionToSpaceMapper* card_counts) { | |
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39 _allocated_heapregions_length = 0; |
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40 |
20337 | 41 _heap_mapper = heap_storage; |
42 | |
43 _prev_bitmap_mapper = prev_bitmap; | |
44 _next_bitmap_mapper = next_bitmap; | |
45 | |
46 _bot_mapper = bot; | |
47 _cardtable_mapper = cardtable; | |
48 | |
49 _card_counts_mapper = card_counts; | |
50 | |
51 MemRegion reserved = heap_storage->reserved(); | |
52 _regions.initialize(reserved.start(), reserved.end(), HeapRegion::GrainBytes); | |
53 | |
54 _available_map.resize(_regions.length(), false); | |
55 _available_map.clear(); | |
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56 } |
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57 |
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58 bool HeapRegionSeq::is_available(uint region) const { |
20337 | 59 return _available_map.at(region); |
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60 } |
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61 |
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62 #ifdef ASSERT |
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63 bool HeapRegionSeq::is_free(HeapRegion* hr) const { |
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64 return _free_list.contains(hr); |
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65 } |
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66 #endif |
342 | 67 |
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68 HeapRegion* HeapRegionSeq::new_heap_region(uint hrs_index) { |
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69 HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(hrs_index); |
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70 MemRegion mr(bottom, bottom + HeapRegion::GrainWords); |
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71 assert(reserved().contains(mr), "invariant"); |
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72 return new HeapRegion(hrs_index, G1CollectedHeap::heap()->bot_shared(), mr); |
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73 } |
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74 |
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75 void HeapRegionSeq::commit_regions(uint index, size_t num_regions) { |
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76 guarantee(num_regions > 0, "Must commit more than zero regions"); |
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77 guarantee(_num_committed + num_regions <= max_length(), "Cannot commit more than the maximum amount of regions"); |
342 | 78 |
20337 | 79 _num_committed += (uint)num_regions; |
80 | |
81 _heap_mapper->commit_regions(index, num_regions); | |
82 | |
83 // Also commit auxiliary data | |
84 _prev_bitmap_mapper->commit_regions(index, num_regions); | |
85 _next_bitmap_mapper->commit_regions(index, num_regions); | |
86 | |
87 _bot_mapper->commit_regions(index, num_regions); | |
88 _cardtable_mapper->commit_regions(index, num_regions); | |
89 | |
90 _card_counts_mapper->commit_regions(index, num_regions); | |
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91 } |
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92 |
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93 void HeapRegionSeq::uncommit_regions(uint start, size_t num_regions) { |
20337 | 94 guarantee(num_regions >= 1, err_msg("Need to specify at least one region to uncommit, tried to uncommit zero regions at %u", start)); |
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95 guarantee(_num_committed >= num_regions, "pre-condition"); |
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96 |
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97 // Print before uncommitting. |
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98 if (G1CollectedHeap::heap()->hr_printer()->is_active()) { |
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99 for (uint i = start; i < start + num_regions; i++) { |
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100 HeapRegion* hr = at(i); |
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101 G1CollectedHeap::heap()->hr_printer()->uncommit(hr->bottom(), hr->end()); |
2152 | 102 } |
103 } | |
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104 |
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105 _num_committed -= (uint)num_regions; |
20337 | 106 |
107 _available_map.par_clear_range(start, start + num_regions, BitMap::unknown_range); | |
108 _heap_mapper->uncommit_regions(start, num_regions); | |
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109 |
20337 | 110 // Also uncommit auxiliary data |
111 _prev_bitmap_mapper->uncommit_regions(start, num_regions); | |
112 _next_bitmap_mapper->uncommit_regions(start, num_regions); | |
113 | |
114 _bot_mapper->uncommit_regions(start, num_regions); | |
115 _cardtable_mapper->uncommit_regions(start, num_regions); | |
116 | |
117 _card_counts_mapper->uncommit_regions(start, num_regions); | |
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118 } |
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119 |
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120 void HeapRegionSeq::make_regions_available(uint start, uint num_regions) { |
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121 guarantee(num_regions > 0, "No point in calling this for zero regions"); |
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122 commit_regions(start, num_regions); |
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123 for (uint i = start; i < start + num_regions; i++) { |
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124 if (_regions.get_by_index(i) == NULL) { |
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125 HeapRegion* new_hr = new_heap_region(i); |
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126 _regions.set_by_index(i, new_hr); |
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127 _allocated_heapregions_length = MAX2(_allocated_heapregions_length, i + 1); |
2152 | 128 } |
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129 } |
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130 |
20337 | 131 _available_map.par_set_range(start, start + num_regions, BitMap::unknown_range); |
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132 |
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133 for (uint i = start; i < start + num_regions; i++) { |
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134 assert(is_available(i), err_msg("Just made region %u available but is apparently not.", i)); |
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135 HeapRegion* hr = at(i); |
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136 if (G1CollectedHeap::heap()->hr_printer()->is_active()) { |
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137 G1CollectedHeap::heap()->hr_printer()->commit(hr->bottom(), hr->end()); |
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138 } |
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139 HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(i); |
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140 MemRegion mr(bottom, bottom + HeapRegion::GrainWords); |
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141 |
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142 hr->initialize(mr); |
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143 insert_into_free_list(at(i)); |
2152 | 144 } |
145 } | |
146 | |
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147 uint HeapRegionSeq::expand_by(uint num_regions) { |
20337 | 148 return expand_at(0, num_regions); |
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149 } |
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150 |
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151 uint HeapRegionSeq::expand_at(uint start, uint num_regions) { |
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152 if (num_regions == 0) { |
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153 return 0; |
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154 } |
3766 | 155 |
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156 uint cur = start; |
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157 uint idx_last_found = 0; |
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158 uint num_last_found = 0; |
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159 |
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160 uint expanded = 0; |
3766 | 161 |
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162 while (expanded < num_regions && |
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163 (num_last_found = find_unavailable_from_idx(cur, &idx_last_found)) > 0) { |
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164 uint to_expand = MIN2(num_regions - expanded, num_last_found); |
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165 make_regions_available(idx_last_found, to_expand); |
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166 expanded += to_expand; |
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167 cur = idx_last_found + num_last_found + 1; |
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168 } |
3766 | 169 |
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170 verify_optional(); |
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171 return expanded; |
3766 | 172 } |
173 | |
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174 uint HeapRegionSeq::find_contiguous(size_t num, bool empty_only) { |
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175 uint found = 0; |
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176 size_t length_found = 0; |
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177 uint cur = 0; |
3766 | 178 |
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179 while (length_found < num && cur < max_length()) { |
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180 HeapRegion* hr = _regions.get_by_index(cur); |
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181 if ((!empty_only && !is_available(cur)) || (is_available(cur) && hr != NULL && hr->is_empty())) { |
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182 // This region is a potential candidate for allocation into. |
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183 length_found++; |
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184 } else { |
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185 // This region is not a candidate. The next region is the next possible one. |
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186 found = cur + 1; |
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187 length_found = 0; |
3766 | 188 } |
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189 cur++; |
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190 } |
3766 | 191 |
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192 if (length_found == num) { |
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193 for (uint i = found; i < (found + num); i++) { |
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194 HeapRegion* hr = _regions.get_by_index(i); |
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195 // sanity check |
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196 guarantee((!empty_only && !is_available(i)) || (is_available(i) && hr != NULL && hr->is_empty()), |
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197 err_msg("Found region sequence starting at " UINT32_FORMAT ", length " SIZE_FORMAT |
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198 " that is not empty at " UINT32_FORMAT ". Hr is " PTR_FORMAT, found, num, i, p2i(hr))); |
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199 } |
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200 return found; |
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201 } else { |
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202 return G1_NO_HRS_INDEX; |
2152 | 203 } |
3766 | 204 } |
205 | |
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206 HeapRegion* HeapRegionSeq::next_region_in_heap(const HeapRegion* r) const { |
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207 guarantee(r != NULL, "Start region must be a valid region"); |
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208 guarantee(is_available(r->hrs_index()), err_msg("Trying to iterate starting from region %u which is not in the heap", r->hrs_index())); |
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209 for (uint i = r->hrs_index() + 1; i < _allocated_heapregions_length; i++) { |
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210 HeapRegion* hr = _regions.get_by_index(i); |
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211 if (is_available(i)) { |
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212 return hr; |
3766 | 213 } |
2152 | 214 } |
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215 return NULL; |
342 | 216 } |
217 | |
3766 | 218 void HeapRegionSeq::iterate(HeapRegionClosure* blk) const { |
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219 uint len = max_length(); |
3766 | 220 |
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221 for (uint i = 0; i < len; i++) { |
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222 if (!is_available(i)) { |
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223 continue; |
342 | 224 } |
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225 guarantee(at(i) != NULL, err_msg("Tried to access region %u that has a NULL HeapRegion*", i)); |
3766 | 226 bool res = blk->doHeapRegion(at(i)); |
342 | 227 if (res) { |
228 blk->incomplete(); | |
229 return; | |
230 } | |
231 } | |
232 } | |
233 | |
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234 uint HeapRegionSeq::find_unavailable_from_idx(uint start_idx, uint* res_idx) const { |
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235 guarantee(res_idx != NULL, "checking"); |
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236 guarantee(start_idx <= (max_length() + 1), "checking"); |
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237 |
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238 uint num_regions = 0; |
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239 |
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240 uint cur = start_idx; |
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241 while (cur < max_length() && is_available(cur)) { |
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242 cur++; |
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243 } |
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244 if (cur == max_length()) { |
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245 return num_regions; |
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246 } |
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247 *res_idx = cur; |
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248 while (cur < max_length() && !is_available(cur)) { |
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249 cur++; |
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250 } |
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251 num_regions = cur - *res_idx; |
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252 #ifdef ASSERT |
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253 for (uint i = *res_idx; i < (*res_idx + num_regions); i++) { |
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254 assert(!is_available(i), "just checking"); |
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255 } |
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256 assert(cur == max_length() || num_regions == 0 || is_available(cur), |
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257 err_msg("The region at the current position %u must be available or at the end of the heap.", cur)); |
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258 #endif |
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259 return num_regions; |
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260 } |
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261 |
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262 uint HeapRegionSeq::start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const { |
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263 return num_regions * worker_i / num_workers; |
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264 } |
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265 |
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266 void HeapRegionSeq::par_iterate(HeapRegionClosure* blk, uint worker_id, uint num_workers, jint claim_value) const { |
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267 const uint start_index = start_region_for_worker(worker_id, num_workers, _allocated_heapregions_length); |
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268 |
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269 // Every worker will actually look at all regions, skipping over regions that |
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270 // are currently not committed. |
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271 // This also (potentially) iterates over regions newly allocated during GC. This |
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272 // is no problem except for some extra work. |
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273 for (uint count = 0; count < _allocated_heapregions_length; count++) { |
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274 const uint index = (start_index + count) % _allocated_heapregions_length; |
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275 assert(0 <= index && index < _allocated_heapregions_length, "sanity"); |
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276 // Skip over unavailable regions |
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277 if (!is_available(index)) { |
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278 continue; |
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279 } |
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280 HeapRegion* r = _regions.get_by_index(index); |
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281 // We'll ignore "continues humongous" regions (we'll process them |
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282 // when we come across their corresponding "start humongous" |
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283 // region) and regions already claimed. |
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284 if (r->claim_value() == claim_value || r->continuesHumongous()) { |
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285 continue; |
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286 } |
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287 // OK, try to claim it |
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288 if (!r->claimHeapRegion(claim_value)) { |
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289 continue; |
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290 } |
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291 // Success! |
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292 if (r->startsHumongous()) { |
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293 // If the region is "starts humongous" we'll iterate over its |
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294 // "continues humongous" first; in fact we'll do them |
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295 // first. The order is important. In one case, calling the |
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296 // closure on the "starts humongous" region might de-allocate |
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297 // and clear all its "continues humongous" regions and, as a |
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298 // result, we might end up processing them twice. So, we'll do |
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299 // them first (note: most closures will ignore them anyway) and |
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300 // then we'll do the "starts humongous" region. |
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301 for (uint ch_index = index + 1; ch_index < index + r->region_num(); ch_index++) { |
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302 HeapRegion* chr = _regions.get_by_index(ch_index); |
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303 |
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304 assert(chr->continuesHumongous(), "Must be humongous region"); |
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305 assert(chr->humongous_start_region() == r, |
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306 err_msg("Must work on humongous continuation of the original start region " |
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307 PTR_FORMAT ", but is " PTR_FORMAT, p2i(r), p2i(chr))); |
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308 assert(chr->claim_value() != claim_value, |
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309 "Must not have been claimed yet because claiming of humongous continuation first claims the start region"); |
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310 |
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311 bool claim_result = chr->claimHeapRegion(claim_value); |
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312 // We should always be able to claim it; no one else should |
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313 // be trying to claim this region. |
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314 guarantee(claim_result, "We should always be able to claim the continuesHumongous part of the humongous object"); |
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315 |
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316 bool res2 = blk->doHeapRegion(chr); |
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317 if (res2) { |
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318 return; |
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319 } |
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320 |
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321 // Right now, this holds (i.e., no closure that actually |
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322 // does something with "continues humongous" regions |
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323 // clears them). We might have to weaken it in the future, |
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324 // but let's leave these two asserts here for extra safety. |
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325 assert(chr->continuesHumongous(), "should still be the case"); |
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326 assert(chr->humongous_start_region() == r, "sanity"); |
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327 } |
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328 } |
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329 |
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330 bool res = blk->doHeapRegion(r); |
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331 if (res) { |
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332 return; |
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333 } |
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334 } |
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335 } |
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336 |
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337 uint HeapRegionSeq::shrink_by(uint num_regions_to_remove) { |
3766 | 338 assert(length() > 0, "the region sequence should not be empty"); |
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339 assert(length() <= _allocated_heapregions_length, "invariant"); |
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340 assert(_allocated_heapregions_length > 0, "we should have at least one region committed"); |
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341 assert(num_regions_to_remove < length(), "We should never remove all regions"); |
342 | 342 |
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343 if (num_regions_to_remove == 0) { |
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344 return 0; |
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345 } |
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346 |
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347 uint removed = 0; |
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348 uint cur = _allocated_heapregions_length - 1; |
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349 uint idx_last_found = 0; |
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350 uint num_last_found = 0; |
3766 | 351 |
20337 | 352 while ((removed < num_regions_to_remove) && |
353 (num_last_found = find_empty_from_idx_reverse(cur, &idx_last_found)) > 0) { | |
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354 // Only allow uncommit from the end of the heap. |
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355 if ((idx_last_found + num_last_found) != _allocated_heapregions_length) { |
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356 return 0; |
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357 } |
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358 uint to_remove = MIN2(num_regions_to_remove - removed, num_last_found); |
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359 |
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360 uncommit_regions(idx_last_found + num_last_found - to_remove, to_remove); |
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361 |
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362 cur -= num_last_found; |
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363 removed += to_remove; |
342 | 364 } |
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365 |
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366 verify_optional(); |
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367 |
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368 return removed; |
342 | 369 } |
370 | |
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371 uint HeapRegionSeq::find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const { |
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372 guarantee(start_idx < _allocated_heapregions_length, "checking"); |
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373 guarantee(res_idx != NULL, "checking"); |
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374 |
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375 uint num_regions_found = 0; |
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376 |
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377 jlong cur = start_idx; |
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378 while (cur != -1 && !(is_available(cur) && at(cur)->is_empty())) { |
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379 cur--; |
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380 } |
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381 if (cur == -1) { |
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382 return num_regions_found; |
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383 } |
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384 jlong old_cur = cur; |
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385 // cur indexes the first empty region |
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386 while (cur != -1 && is_available(cur) && at(cur)->is_empty()) { |
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387 cur--; |
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388 } |
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389 *res_idx = cur + 1; |
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390 num_regions_found = old_cur - cur; |
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391 |
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392 #ifdef ASSERT |
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393 for (uint i = *res_idx; i < (*res_idx + num_regions_found); i++) { |
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394 assert(at(i)->is_empty(), "just checking"); |
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395 } |
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396 #endif |
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397 return num_regions_found; |
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398 } |
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399 |
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400 void HeapRegionSeq::verify() { |
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401 guarantee(length() <= _allocated_heapregions_length, |
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402 err_msg("invariant: _length: %u _allocated_length: %u", |
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403 length(), _allocated_heapregions_length)); |
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404 guarantee(_allocated_heapregions_length <= max_length(), |
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405 err_msg("invariant: _allocated_length: %u _max_length: %u", |
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406 _allocated_heapregions_length, max_length())); |
3766 | 407 |
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408 bool prev_committed = true; |
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409 uint num_committed = 0; |
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410 HeapWord* prev_end = heap_bottom(); |
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411 for (uint i = 0; i < _allocated_heapregions_length; i++) { |
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412 if (!is_available(i)) { |
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413 prev_committed = false; |
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414 continue; |
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415 } |
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416 num_committed++; |
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417 HeapRegion* hr = _regions.get_by_index(i); |
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418 guarantee(hr != NULL, err_msg("invariant: i: %u", i)); |
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419 guarantee(!prev_committed || hr->bottom() == prev_end, |
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420 err_msg("invariant i: %u "HR_FORMAT" prev_end: "PTR_FORMAT, |
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421 i, HR_FORMAT_PARAMS(hr), p2i(prev_end))); |
3766 | 422 guarantee(hr->hrs_index() == i, |
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423 err_msg("invariant: i: %u hrs_index(): %u", i, hr->hrs_index())); |
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424 // Asserts will fire if i is >= _length |
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425 HeapWord* addr = hr->bottom(); |
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426 guarantee(addr_to_region(addr) == hr, "sanity"); |
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427 // We cannot check whether the region is part of a particular set: at the time |
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428 // this method may be called, we have only completed allocation of the regions, |
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429 // but not put into a region set. |
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430 prev_committed = true; |
3766 | 431 if (hr->startsHumongous()) { |
432 prev_end = hr->orig_end(); | |
433 } else { | |
434 prev_end = hr->end(); | |
435 } | |
342 | 436 } |
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437 for (uint i = _allocated_heapregions_length; i < max_length(); i++) { |
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438 guarantee(_regions.get_by_index(i) == NULL, err_msg("invariant i: %u", i)); |
3766 | 439 } |
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440 |
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441 guarantee(num_committed == _num_committed, err_msg("Found %u committed regions, but should be %u", num_committed, _num_committed)); |
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442 _free_list.verify(); |
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443 } |
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444 |
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445 #ifndef PRODUCT |
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446 void HeapRegionSeq::verify_optional() { |
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447 verify(); |
342 | 448 } |
3766 | 449 #endif // PRODUCT |
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450 |