Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp @ 5935:a735aec54ea4
7123170: JCK vm/jvmti/ResourceExhausted/resexh001/resexh00101/ tests fails since 7u4 b02
Summary: The JVMTI ResourceExhausted events must be generated in all places where OOME is thrown
Reviewed-by: acorn, coleenp, dcubed, dholmes, dsamersoff, jwilhelm, tonyp
Contributed-by: serguei.spitsyn@oracle.com
author | sspitsyn |
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date | Wed, 14 Mar 2012 20:06:48 -0700 |
parents | 441e946dc1af |
children | 33df1aeaebbf d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2007, 2011, 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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "memory/cardTableModRefBS.hpp" | |
28 #include "memory/cardTableRS.hpp" | |
29 #include "memory/sharedHeap.hpp" | |
30 #include "memory/space.inline.hpp" | |
31 #include "memory/universe.hpp" | |
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32 #include "oops/oop.inline.hpp" |
1972 | 33 #include "runtime/java.hpp" |
34 #include "runtime/mutexLocker.hpp" | |
35 #include "runtime/virtualspace.hpp" | |
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36 #include "runtime/vmThread.hpp" |
0 | 37 |
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38 void CardTableModRefBS::non_clean_card_iterate_parallel_work(Space* sp, MemRegion mr, |
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39 OopsInGenClosure* cl, |
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40 CardTableRS* ct, |
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41 int n_threads) { |
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42 assert(n_threads > 0, "Error: expected n_threads > 0"); |
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43 assert((n_threads == 1 && ParallelGCThreads == 0) || |
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44 n_threads <= (int)ParallelGCThreads, |
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45 "# worker threads != # requested!"); |
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46 assert(!Thread::current()->is_VM_thread() || (n_threads == 1), "There is only 1 VM thread"); |
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47 assert(UseDynamicNumberOfGCThreads || |
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48 !FLAG_IS_DEFAULT(ParallelGCThreads) || |
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49 n_threads == (int)ParallelGCThreads, |
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50 "# worker threads != # requested!"); |
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51 // Make sure the LNC array is valid for the space. |
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52 jbyte** lowest_non_clean; |
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53 uintptr_t lowest_non_clean_base_chunk_index; |
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54 size_t lowest_non_clean_chunk_size; |
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55 get_LNC_array_for_space(sp, lowest_non_clean, |
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56 lowest_non_clean_base_chunk_index, |
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57 lowest_non_clean_chunk_size); |
0 | 58 |
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59 uint n_strides = n_threads * ParGCStridesPerThread; |
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60 SequentialSubTasksDone* pst = sp->par_seq_tasks(); |
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61 // Sets the condition for completion of the subtask (how many threads |
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62 // need to finish in order to be done). |
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63 pst->set_n_threads(n_threads); |
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64 pst->set_n_tasks(n_strides); |
0 | 65 |
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66 uint stride = 0; |
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67 while (!pst->is_task_claimed(/* reference */ stride)) { |
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68 process_stride(sp, mr, stride, n_strides, cl, ct, |
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69 lowest_non_clean, |
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70 lowest_non_clean_base_chunk_index, |
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71 lowest_non_clean_chunk_size); |
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72 } |
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73 if (pst->all_tasks_completed()) { |
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74 // Clear lowest_non_clean array for next time. |
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75 intptr_t first_chunk_index = addr_to_chunk_index(mr.start()); |
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76 uintptr_t last_chunk_index = addr_to_chunk_index(mr.last()); |
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77 for (uintptr_t ch = first_chunk_index; ch <= last_chunk_index; ch++) { |
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78 intptr_t ind = ch - lowest_non_clean_base_chunk_index; |
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79 assert(0 <= ind && ind < (intptr_t)lowest_non_clean_chunk_size, |
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80 "Bounds error"); |
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81 lowest_non_clean[ind] = NULL; |
0 | 82 } |
83 } | |
84 } | |
85 | |
86 void | |
87 CardTableModRefBS:: | |
88 process_stride(Space* sp, | |
89 MemRegion used, | |
90 jint stride, int n_strides, | |
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91 OopsInGenClosure* cl, |
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92 CardTableRS* ct, |
0 | 93 jbyte** lowest_non_clean, |
94 uintptr_t lowest_non_clean_base_chunk_index, | |
95 size_t lowest_non_clean_chunk_size) { | |
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96 // We go from higher to lower addresses here; it wouldn't help that much |
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97 // because of the strided parallelism pattern used here. |
0 | 98 |
99 // Find the first card address of the first chunk in the stride that is | |
100 // at least "bottom" of the used region. | |
101 jbyte* start_card = byte_for(used.start()); | |
102 jbyte* end_card = byte_after(used.last()); | |
103 uintptr_t start_chunk = addr_to_chunk_index(used.start()); | |
104 uintptr_t start_chunk_stride_num = start_chunk % n_strides; | |
105 jbyte* chunk_card_start; | |
106 | |
107 if ((uintptr_t)stride >= start_chunk_stride_num) { | |
108 chunk_card_start = (jbyte*)(start_card + | |
109 (stride - start_chunk_stride_num) * | |
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110 ParGCCardsPerStrideChunk); |
0 | 111 } else { |
112 // Go ahead to the next chunk group boundary, then to the requested stride. | |
113 chunk_card_start = (jbyte*)(start_card + | |
114 (n_strides - start_chunk_stride_num + stride) * | |
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115 ParGCCardsPerStrideChunk); |
0 | 116 } |
117 | |
118 while (chunk_card_start < end_card) { | |
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119 // Even though we go from lower to higher addresses below, the |
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120 // strided parallelism can interleave the actual processing of the |
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121 // dirty pages in various ways. For a specific chunk within this |
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122 // stride, we take care to avoid double scanning or missing a card |
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123 // by suitably initializing the "min_done" field in process_chunk_boundaries() |
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124 // below, together with the dirty region extension accomplished in |
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125 // DirtyCardToOopClosure::do_MemRegion(). |
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126 jbyte* chunk_card_end = chunk_card_start + ParGCCardsPerStrideChunk; |
0 | 127 // Invariant: chunk_mr should be fully contained within the "used" region. |
128 MemRegion chunk_mr = MemRegion(addr_for(chunk_card_start), | |
129 chunk_card_end >= end_card ? | |
130 used.end() : addr_for(chunk_card_end)); | |
131 assert(chunk_mr.word_size() > 0, "[chunk_card_start > used_end)"); | |
132 assert(used.contains(chunk_mr), "chunk_mr should be subset of used"); | |
133 | |
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134 DirtyCardToOopClosure* dcto_cl = sp->new_dcto_cl(cl, precision(), |
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135 cl->gen_boundary()); |
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136 ClearNoncleanCardWrapper clear_cl(dcto_cl, ct); |
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137 |
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138 |
0 | 139 // Process the chunk. |
140 process_chunk_boundaries(sp, | |
141 dcto_cl, | |
142 chunk_mr, | |
143 used, | |
144 lowest_non_clean, | |
145 lowest_non_clean_base_chunk_index, | |
146 lowest_non_clean_chunk_size); | |
147 | |
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148 // We want the LNC array updates above in process_chunk_boundaries |
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149 // to be visible before any of the card table value changes as a |
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150 // result of the dirty card iteration below. |
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151 OrderAccess::storestore(); |
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152 |
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153 // We do not call the non_clean_card_iterate_serial() version because |
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154 // we want to clear the cards: clear_cl here does the work of finding |
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155 // contiguous dirty ranges of cards to process and clear. |
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156 clear_cl.do_MemRegion(chunk_mr); |
0 | 157 |
158 // Find the next chunk of the stride. | |
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159 chunk_card_start += ParGCCardsPerStrideChunk * n_strides; |
0 | 160 } |
161 } | |
162 | |
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163 |
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164 // If you want a talkative process_chunk_boundaries, |
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165 // then #define NOISY(x) x |
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166 #ifdef NOISY |
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167 #error "Encountered a global preprocessor flag, NOISY, which might clash with local definition to follow" |
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168 #else |
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169 #define NOISY(x) |
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170 #endif |
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171 |
0 | 172 void |
173 CardTableModRefBS:: | |
174 process_chunk_boundaries(Space* sp, | |
175 DirtyCardToOopClosure* dcto_cl, | |
176 MemRegion chunk_mr, | |
177 MemRegion used, | |
178 jbyte** lowest_non_clean, | |
179 uintptr_t lowest_non_clean_base_chunk_index, | |
180 size_t lowest_non_clean_chunk_size) | |
181 { | |
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182 // We must worry about non-array objects that cross chunk boundaries, |
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183 // because such objects are both precisely and imprecisely marked: |
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184 // .. if the head of such an object is dirty, the entire object |
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185 // needs to be scanned, under the interpretation that this |
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186 // was an imprecise mark |
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187 // .. if the head of such an object is not dirty, we can assume |
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188 // precise marking and it's efficient to scan just the dirty |
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189 // cards. |
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190 // In either case, each scanned reference must be scanned precisely |
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191 // once so as to avoid cloning of a young referent. For efficiency, |
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192 // our closures depend on this property and do not protect against |
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193 // double scans. |
0 | 194 |
195 uintptr_t cur_chunk_index = addr_to_chunk_index(chunk_mr.start()); | |
196 cur_chunk_index = cur_chunk_index - lowest_non_clean_base_chunk_index; | |
197 | |
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198 NOISY(tty->print_cr("===========================================================================");) |
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199 NOISY(tty->print_cr(" process_chunk_boundary: Called with [" PTR_FORMAT "," PTR_FORMAT ")", |
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200 chunk_mr.start(), chunk_mr.end());) |
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201 |
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202 // First, set "our" lowest_non_clean entry, which would be |
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203 // used by the thread scanning an adjoining left chunk with |
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204 // a non-array object straddling the mutual boundary. |
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205 // Find the object that spans our boundary, if one exists. |
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206 // first_block is the block possibly straddling our left boundary. |
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207 HeapWord* first_block = sp->block_start(chunk_mr.start()); |
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208 assert((chunk_mr.start() != used.start()) || (first_block == chunk_mr.start()), |
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209 "First chunk should always have a co-initial block"); |
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210 // Does the block straddle the chunk's left boundary, and is it |
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211 // a non-array object? |
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212 if (first_block < chunk_mr.start() // first block straddles left bdry |
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213 && sp->block_is_obj(first_block) // first block is an object |
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214 && !(oop(first_block)->is_objArray() // first block is not an array (arrays are precisely dirtied) |
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215 || oop(first_block)->is_typeArray())) { |
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216 // Find our least non-clean card, so that a left neighbour |
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217 // does not scan an object straddling the mutual boundary |
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218 // too far to the right, and attempt to scan a portion of |
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219 // that object twice. |
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220 jbyte* first_dirty_card = NULL; |
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221 jbyte* last_card_of_first_obj = |
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222 byte_for(first_block + sp->block_size(first_block) - 1); |
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223 jbyte* first_card_of_cur_chunk = byte_for(chunk_mr.start()); |
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224 jbyte* last_card_of_cur_chunk = byte_for(chunk_mr.last()); |
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225 jbyte* last_card_to_check = |
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226 (jbyte*) MIN2((intptr_t) last_card_of_cur_chunk, |
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227 (intptr_t) last_card_of_first_obj); |
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228 // Note that this does not need to go beyond our last card |
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229 // if our first object completely straddles this chunk. |
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230 for (jbyte* cur = first_card_of_cur_chunk; |
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231 cur <= last_card_to_check; cur++) { |
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232 jbyte val = *cur; |
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233 if (card_will_be_scanned(val)) { |
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234 first_dirty_card = cur; break; |
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235 } else { |
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236 assert(!card_may_have_been_dirty(val), "Error"); |
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237 } |
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238 } |
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239 if (first_dirty_card != NULL) { |
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240 NOISY(tty->print_cr(" LNC: Found a dirty card at " PTR_FORMAT " in current chunk", |
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241 first_dirty_card);) |
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242 assert(0 <= cur_chunk_index && cur_chunk_index < lowest_non_clean_chunk_size, |
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243 "Bounds error."); |
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244 assert(lowest_non_clean[cur_chunk_index] == NULL, |
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245 "Write exactly once : value should be stable hereafter for this round"); |
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246 lowest_non_clean[cur_chunk_index] = first_dirty_card; |
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247 } NOISY(else { |
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248 tty->print_cr(" LNC: Found no dirty card in current chunk; leaving LNC entry NULL"); |
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249 // In the future, we could have this thread look for a non-NULL value to copy from its |
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250 // right neighbour (up to the end of the first object). |
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251 if (last_card_of_cur_chunk < last_card_of_first_obj) { |
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252 tty->print_cr(" LNC: BEWARE!!! first obj straddles past right end of chunk:\n" |
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253 " might be efficient to get value from right neighbour?"); |
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254 } |
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255 }) |
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256 } else { |
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257 // In this case we can help our neighbour by just asking them |
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258 // to stop at our first card (even though it may not be dirty). |
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259 NOISY(tty->print_cr(" LNC: first block is not a non-array object; setting LNC to first card of current chunk");) |
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260 assert(lowest_non_clean[cur_chunk_index] == NULL, "Write once : value should be stable hereafter"); |
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261 jbyte* first_card_of_cur_chunk = byte_for(chunk_mr.start()); |
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262 lowest_non_clean[cur_chunk_index] = first_card_of_cur_chunk; |
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263 } |
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264 NOISY(tty->print_cr(" process_chunk_boundary: lowest_non_clean[" INTPTR_FORMAT "] = " PTR_FORMAT |
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265 " which corresponds to the heap address " PTR_FORMAT, |
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266 cur_chunk_index, lowest_non_clean[cur_chunk_index], |
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267 (lowest_non_clean[cur_chunk_index] != NULL) |
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268 ? addr_for(lowest_non_clean[cur_chunk_index]) |
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269 : NULL);) |
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270 NOISY(tty->print_cr("---------------------------------------------------------------------------");) |
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271 |
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272 // Next, set our own max_to_do, which will strictly/exclusively bound |
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273 // the highest address that we will scan past the right end of our chunk. |
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274 HeapWord* max_to_do = NULL; |
0 | 275 if (chunk_mr.end() < used.end()) { |
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276 // This is not the last chunk in the used region. |
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277 // What is our last block? We check the first block of |
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278 // the next (right) chunk rather than strictly check our last block |
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279 // because it's potentially more efficient to do so. |
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280 HeapWord* const last_block = sp->block_start(chunk_mr.end()); |
0 | 281 assert(last_block <= chunk_mr.end(), "In case this property changes."); |
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282 if ((last_block == chunk_mr.end()) // our last block does not straddle boundary |
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283 || !sp->block_is_obj(last_block) // last_block isn't an object |
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284 || oop(last_block)->is_objArray() // last_block is an array (precisely marked) |
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285 || oop(last_block)->is_typeArray()) { |
0 | 286 max_to_do = chunk_mr.end(); |
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287 NOISY(tty->print_cr(" process_chunk_boundary: Last block on this card is not a non-array object;\n" |
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288 " max_to_do left at " PTR_FORMAT, max_to_do);) |
0 | 289 } else { |
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290 assert(last_block < chunk_mr.end(), "Tautology"); |
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291 // It is a non-array object that straddles the right boundary of this chunk. |
0 | 292 // last_obj_card is the card corresponding to the start of the last object |
293 // in the chunk. Note that the last object may not start in | |
294 // the chunk. | |
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295 jbyte* const last_obj_card = byte_for(last_block); |
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296 const jbyte val = *last_obj_card; |
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297 if (!card_will_be_scanned(val)) { |
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298 assert(!card_may_have_been_dirty(val), "Error"); |
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299 // The card containing the head is not dirty. Any marks on |
0 | 300 // subsequent cards still in this chunk must have been made |
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301 // precisely; we can cap processing at the end of our chunk. |
0 | 302 max_to_do = chunk_mr.end(); |
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303 NOISY(tty->print_cr(" process_chunk_boundary: Head of last object on this card is not dirty;\n" |
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304 " max_to_do left at " PTR_FORMAT, |
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305 max_to_do);) |
0 | 306 } else { |
307 // The last object must be considered dirty, and extends onto the | |
308 // following chunk. Look for a dirty card in that chunk that will | |
309 // bound our processing. | |
310 jbyte* limit_card = NULL; | |
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311 const size_t last_block_size = sp->block_size(last_block); |
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312 jbyte* const last_card_of_last_obj = |
0 | 313 byte_for(last_block + last_block_size - 1); |
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314 jbyte* const first_card_of_next_chunk = byte_for(chunk_mr.end()); |
0 | 315 // This search potentially goes a long distance looking |
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316 // for the next card that will be scanned, terminating |
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317 // at the end of the last_block, if no earlier dirty card |
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318 // is found. |
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319 assert(byte_for(chunk_mr.end()) - byte_for(chunk_mr.start()) == ParGCCardsPerStrideChunk, |
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320 "last card of next chunk may be wrong"); |
0 | 321 for (jbyte* cur = first_card_of_next_chunk; |
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322 cur <= last_card_of_last_obj; cur++) { |
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323 const jbyte val = *cur; |
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324 if (card_will_be_scanned(val)) { |
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325 NOISY(tty->print_cr(" Found a non-clean card " PTR_FORMAT " with value 0x%x", |
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326 cur, (int)val);) |
0 | 327 limit_card = cur; break; |
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328 } else { |
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329 assert(!card_may_have_been_dirty(val), "Error: card can't be skipped"); |
0 | 330 } |
331 } | |
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332 if (limit_card != NULL) { |
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333 max_to_do = addr_for(limit_card); |
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334 assert(limit_card != NULL && max_to_do != NULL, "Error"); |
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335 NOISY(tty->print_cr(" process_chunk_boundary: Found a dirty card at " PTR_FORMAT |
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336 " max_to_do set at " PTR_FORMAT " which is before end of last block in chunk: " |
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337 PTR_FORMAT " + " PTR_FORMAT " = " PTR_FORMAT, |
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338 limit_card, max_to_do, last_block, last_block_size, (last_block+last_block_size));) |
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339 } else { |
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340 // The following is a pessimistic value, because it's possible |
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341 // that a dirty card on a subsequent chunk has been cleared by |
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342 // the time we get to look at it; we'll correct for that further below, |
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343 // using the LNC array which records the least non-clean card |
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344 // before cards were cleared in a particular chunk. |
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345 limit_card = last_card_of_last_obj; |
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346 max_to_do = last_block + last_block_size; |
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347 assert(limit_card != NULL && max_to_do != NULL, "Error"); |
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348 NOISY(tty->print_cr(" process_chunk_boundary: Found no dirty card before end of last block in chunk\n" |
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349 " Setting limit_card to " PTR_FORMAT |
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350 " and max_to_do " PTR_FORMAT " + " PTR_FORMAT " = " PTR_FORMAT, |
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351 limit_card, last_block, last_block_size, max_to_do);) |
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352 } |
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353 assert(0 < cur_chunk_index+1 && cur_chunk_index+1 < lowest_non_clean_chunk_size, |
0 | 354 "Bounds error."); |
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355 // It is possible that a dirty card for the last object may have been |
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356 // cleared before we had a chance to examine it. In that case, the value |
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357 // will have been logged in the LNC for that chunk. |
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358 // We need to examine as many chunks to the right as this object |
3762
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359 // covers. However, we need to bound this checking to the largest |
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360 // entry in the LNC array: this is because the heap may expand |
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361 // after the LNC array has been created but before we reach this point, |
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362 // and the last block in our chunk may have been expanded to include |
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363 // the expansion delta (and possibly subsequently allocated from, so |
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364 // it wouldn't be sufficient to check whether that last block was |
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365 // or was not an object at this point). |
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366 uintptr_t last_chunk_index_to_check = addr_to_chunk_index(last_block + last_block_size - 1) |
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367 - lowest_non_clean_base_chunk_index; |
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368 const uintptr_t last_chunk_index = addr_to_chunk_index(used.last()) |
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369 - lowest_non_clean_base_chunk_index; |
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370 if (last_chunk_index_to_check > last_chunk_index) { |
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371 assert(last_block + last_block_size > used.end(), |
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372 err_msg("Inconsistency detected: last_block [" PTR_FORMAT "," PTR_FORMAT "]" |
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373 " does not exceed used.end() = " PTR_FORMAT "," |
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374 " yet last_chunk_index_to_check " INTPTR_FORMAT |
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375 " exceeds last_chunk_index " INTPTR_FORMAT, |
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376 last_chunk_index_to_check, last_chunk_index)); |
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377 assert(sp->used_region().end() > used.end(), |
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378 err_msg("Expansion did not happen: " |
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379 "[" PTR_FORMAT "," PTR_FORMAT ") -> [" PTR_FORMAT "," PTR_FORMAT ")", |
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380 sp->used_region().start(), sp->used_region().end(), used.start(), used.end())); |
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381 NOISY(tty->print_cr(" process_chunk_boundary: heap expanded; explicitly bounding last_chunk");) |
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382 last_chunk_index_to_check = last_chunk_index; |
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383 } |
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384 for (uintptr_t lnc_index = cur_chunk_index + 1; |
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385 lnc_index <= last_chunk_index_to_check; |
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386 lnc_index++) { |
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387 jbyte* lnc_card = lowest_non_clean[lnc_index]; |
0 | 388 if (lnc_card != NULL) { |
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389 // we can stop at the first non-NULL entry we find |
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390 if (lnc_card <= limit_card) { |
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391 NOISY(tty->print_cr(" process_chunk_boundary: LNC card " PTR_FORMAT " is lower than limit_card " PTR_FORMAT, |
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392 " max_to_do will be lowered to " PTR_FORMAT " from " PTR_FORMAT, |
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393 lnc_card, limit_card, addr_for(lnc_card), max_to_do);) |
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394 limit_card = lnc_card; |
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395 max_to_do = addr_for(limit_card); |
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396 assert(limit_card != NULL && max_to_do != NULL, "Error"); |
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397 } |
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398 // In any case, we break now |
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399 break; |
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400 } // else continue to look for a non-NULL entry if any |
0 | 401 } |
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402 assert(limit_card != NULL && max_to_do != NULL, "Error"); |
0 | 403 } |
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404 assert(max_to_do != NULL, "OOPS 1 !"); |
0 | 405 } |
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406 assert(max_to_do != NULL, "OOPS 2!"); |
0 | 407 } else { |
408 max_to_do = used.end(); | |
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409 NOISY(tty->print_cr(" process_chunk_boundary: Last chunk of this space;\n" |
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410 " max_to_do left at " PTR_FORMAT, |
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411 max_to_do);) |
0 | 412 } |
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413 assert(max_to_do != NULL, "OOPS 3!"); |
0 | 414 // Now we can set the closure we're using so it doesn't to beyond |
415 // max_to_do. | |
416 dcto_cl->set_min_done(max_to_do); | |
417 #ifndef PRODUCT | |
418 dcto_cl->set_last_bottom(max_to_do); | |
419 #endif | |
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420 NOISY(tty->print_cr("===========================================================================\n");) |
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421 } |
0 | 422 |
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423 #undef NOISY |
0 | 424 |
425 void | |
426 CardTableModRefBS:: | |
427 get_LNC_array_for_space(Space* sp, | |
428 jbyte**& lowest_non_clean, | |
429 uintptr_t& lowest_non_clean_base_chunk_index, | |
430 size_t& lowest_non_clean_chunk_size) { | |
431 | |
432 int i = find_covering_region_containing(sp->bottom()); | |
433 MemRegion covered = _covered[i]; | |
434 size_t n_chunks = chunks_to_cover(covered); | |
435 | |
436 // Only the first thread to obtain the lock will resize the | |
437 // LNC array for the covered region. Any later expansion can't affect | |
438 // the used_at_save_marks region. | |
439 // (I observed a bug in which the first thread to execute this would | |
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440 // resize, and then it would cause "expand_and_allocate" that would |
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441 // increase the number of chunks in the covered region. Then a second |
0 | 442 // thread would come and execute this, see that the size didn't match, |
443 // and free and allocate again. So the first thread would be using a | |
444 // freed "_lowest_non_clean" array.) | |
445 | |
446 // Do a dirty read here. If we pass the conditional then take the rare | |
447 // event lock and do the read again in case some other thread had already | |
448 // succeeded and done the resize. | |
449 int cur_collection = Universe::heap()->total_collections(); | |
450 if (_last_LNC_resizing_collection[i] != cur_collection) { | |
451 MutexLocker x(ParGCRareEvent_lock); | |
452 if (_last_LNC_resizing_collection[i] != cur_collection) { | |
453 if (_lowest_non_clean[i] == NULL || | |
454 n_chunks != _lowest_non_clean_chunk_size[i]) { | |
455 | |
456 // Should we delete the old? | |
457 if (_lowest_non_clean[i] != NULL) { | |
458 assert(n_chunks != _lowest_non_clean_chunk_size[i], | |
459 "logical consequence"); | |
460 FREE_C_HEAP_ARRAY(CardPtr, _lowest_non_clean[i]); | |
461 _lowest_non_clean[i] = NULL; | |
462 } | |
463 // Now allocate a new one if necessary. | |
464 if (_lowest_non_clean[i] == NULL) { | |
465 _lowest_non_clean[i] = NEW_C_HEAP_ARRAY(CardPtr, n_chunks); | |
466 _lowest_non_clean_chunk_size[i] = n_chunks; | |
467 _lowest_non_clean_base_chunk_index[i] = addr_to_chunk_index(covered.start()); | |
468 for (int j = 0; j < (int)n_chunks; j++) | |
469 _lowest_non_clean[i][j] = NULL; | |
470 } | |
471 } | |
472 _last_LNC_resizing_collection[i] = cur_collection; | |
473 } | |
474 } | |
475 // In any case, now do the initialization. | |
476 lowest_non_clean = _lowest_non_clean[i]; | |
477 lowest_non_clean_base_chunk_index = _lowest_non_clean_base_chunk_index[i]; | |
478 lowest_non_clean_chunk_size = _lowest_non_clean_chunk_size[i]; | |
479 } |