Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 495:234c22e54b98
6784849: par compact - can fail when to_space is non-empty
Reviewed-by: jmasa, tonyp
author | jcoomes |
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date | Thu, 18 Dec 2008 10:53:35 -0800 |
parents | 0f773163217d |
children | b27c885f75f9 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2005-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_psParallelCompact.cpp.incl" | |
27 | |
28 #include <math.h> | |
29 | |
30 // All sizes are in HeapWords. | |
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31 const size_t ParallelCompactData::Log2RegionSize = 9; // 512 words |
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32 const size_t ParallelCompactData::RegionSize = (size_t)1 << Log2RegionSize; |
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33 const size_t ParallelCompactData::RegionSizeBytes = |
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34 RegionSize << LogHeapWordSize; |
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35 const size_t ParallelCompactData::RegionSizeOffsetMask = RegionSize - 1; |
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36 const size_t ParallelCompactData::RegionAddrOffsetMask = RegionSizeBytes - 1; |
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37 const size_t ParallelCompactData::RegionAddrMask = ~RegionAddrOffsetMask; |
0 | 38 |
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39 const ParallelCompactData::RegionData::region_sz_t |
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40 ParallelCompactData::RegionData::dc_shift = 27; |
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41 |
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42 const ParallelCompactData::RegionData::region_sz_t |
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43 ParallelCompactData::RegionData::dc_mask = ~0U << dc_shift; |
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44 |
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45 const ParallelCompactData::RegionData::region_sz_t |
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46 ParallelCompactData::RegionData::dc_one = 0x1U << dc_shift; |
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47 |
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48 const ParallelCompactData::RegionData::region_sz_t |
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49 ParallelCompactData::RegionData::los_mask = ~dc_mask; |
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50 |
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51 const ParallelCompactData::RegionData::region_sz_t |
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52 ParallelCompactData::RegionData::dc_claimed = 0x8U << dc_shift; |
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53 |
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54 const ParallelCompactData::RegionData::region_sz_t |
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55 ParallelCompactData::RegionData::dc_completed = 0xcU << dc_shift; |
0 | 56 |
57 SpaceInfo PSParallelCompact::_space_info[PSParallelCompact::last_space_id]; | |
58 bool PSParallelCompact::_print_phases = false; | |
59 | |
60 ReferenceProcessor* PSParallelCompact::_ref_processor = NULL; | |
61 klassOop PSParallelCompact::_updated_int_array_klass_obj = NULL; | |
62 | |
63 double PSParallelCompact::_dwl_mean; | |
64 double PSParallelCompact::_dwl_std_dev; | |
65 double PSParallelCompact::_dwl_first_term; | |
66 double PSParallelCompact::_dwl_adjustment; | |
67 #ifdef ASSERT | |
68 bool PSParallelCompact::_dwl_initialized = false; | |
69 #endif // #ifdef ASSERT | |
70 | |
71 #ifdef VALIDATE_MARK_SWEEP | |
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72 GrowableArray<void*>* PSParallelCompact::_root_refs_stack = NULL; |
0 | 73 GrowableArray<oop> * PSParallelCompact::_live_oops = NULL; |
74 GrowableArray<oop> * PSParallelCompact::_live_oops_moved_to = NULL; | |
75 GrowableArray<size_t>* PSParallelCompact::_live_oops_size = NULL; | |
76 size_t PSParallelCompact::_live_oops_index = 0; | |
77 size_t PSParallelCompact::_live_oops_index_at_perm = 0; | |
113
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78 GrowableArray<void*>* PSParallelCompact::_other_refs_stack = NULL; |
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79 GrowableArray<void*>* PSParallelCompact::_adjusted_pointers = NULL; |
0 | 80 bool PSParallelCompact::_pointer_tracking = false; |
81 bool PSParallelCompact::_root_tracking = true; | |
82 | |
83 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops = NULL; | |
84 GrowableArray<HeapWord*>* PSParallelCompact::_cur_gc_live_oops_moved_to = NULL; | |
85 GrowableArray<size_t> * PSParallelCompact::_cur_gc_live_oops_size = NULL; | |
86 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops = NULL; | |
87 GrowableArray<HeapWord*>* PSParallelCompact::_last_gc_live_oops_moved_to = NULL; | |
88 GrowableArray<size_t> * PSParallelCompact::_last_gc_live_oops_size = NULL; | |
89 #endif | |
90 | |
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91 void SplitInfo::record(size_t src_region_idx, size_t partial_obj_size, |
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92 HeapWord* destination) |
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93 { |
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94 assert(src_region_idx != 0, "invalid src_region_idx"); |
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95 assert(partial_obj_size != 0, "invalid partial_obj_size argument"); |
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96 assert(destination != NULL, "invalid destination argument"); |
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97 |
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98 _src_region_idx = src_region_idx; |
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99 _partial_obj_size = partial_obj_size; |
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100 _destination = destination; |
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101 |
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102 // These fields may not be updated below, so make sure they're clear. |
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103 assert(_dest_region_addr == NULL, "should have been cleared"); |
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104 assert(_first_src_addr == NULL, "should have been cleared"); |
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105 |
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106 // Determine the number of destination regions for the partial object. |
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107 HeapWord* const last_word = destination + partial_obj_size - 1; |
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108 const ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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109 HeapWord* const beg_region_addr = sd.region_align_down(destination); |
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110 HeapWord* const end_region_addr = sd.region_align_down(last_word); |
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111 |
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112 if (beg_region_addr == end_region_addr) { |
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113 // One destination region. |
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114 _destination_count = 1; |
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115 if (end_region_addr == destination) { |
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116 // The destination falls on a region boundary, thus the first word of the |
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117 // partial object will be the first word copied to the destination region. |
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118 _dest_region_addr = end_region_addr; |
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119 _first_src_addr = sd.region_to_addr(src_region_idx); |
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120 } |
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121 } else { |
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122 // Two destination regions. When copied, the partial object will cross a |
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123 // destination region boundary, so a word somewhere within the partial |
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124 // object will be the first word copied to the second destination region. |
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125 _destination_count = 2; |
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126 _dest_region_addr = end_region_addr; |
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127 const size_t ofs = pointer_delta(end_region_addr, destination); |
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128 assert(ofs < _partial_obj_size, "sanity"); |
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129 _first_src_addr = sd.region_to_addr(src_region_idx) + ofs; |
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130 } |
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131 } |
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132 |
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133 void SplitInfo::clear() |
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134 { |
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135 _src_region_idx = 0; |
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136 _partial_obj_size = 0; |
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137 _destination = NULL; |
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138 _destination_count = 0; |
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139 _dest_region_addr = NULL; |
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140 _first_src_addr = NULL; |
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141 assert(!is_valid(), "sanity"); |
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142 } |
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143 |
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144 #ifdef ASSERT |
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145 void SplitInfo::verify_clear() |
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146 { |
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147 assert(_src_region_idx == 0, "not clear"); |
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148 assert(_partial_obj_size == 0, "not clear"); |
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149 assert(_destination == NULL, "not clear"); |
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150 assert(_destination_count == 0, "not clear"); |
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151 assert(_dest_region_addr == NULL, "not clear"); |
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152 assert(_first_src_addr == NULL, "not clear"); |
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153 } |
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154 #endif // #ifdef ASSERT |
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155 |
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156 |
0 | 157 #ifndef PRODUCT |
158 const char* PSParallelCompact::space_names[] = { | |
159 "perm", "old ", "eden", "from", "to " | |
160 }; | |
161 | |
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162 void PSParallelCompact::print_region_ranges() |
0 | 163 { |
164 tty->print_cr("space bottom top end new_top"); | |
165 tty->print_cr("------ ---------- ---------- ---------- ----------"); | |
166 | |
167 for (unsigned int id = 0; id < last_space_id; ++id) { | |
168 const MutableSpace* space = _space_info[id].space(); | |
169 tty->print_cr("%u %s " | |
264
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170 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " " |
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171 SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10) " ", |
0 | 172 id, space_names[id], |
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173 summary_data().addr_to_region_idx(space->bottom()), |
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174 summary_data().addr_to_region_idx(space->top()), |
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175 summary_data().addr_to_region_idx(space->end()), |
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176 summary_data().addr_to_region_idx(_space_info[id].new_top())); |
0 | 177 } |
178 } | |
179 | |
180 void | |
375
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181 print_generic_summary_region(size_t i, const ParallelCompactData::RegionData* c) |
0 | 182 { |
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183 #define REGION_IDX_FORMAT SIZE_FORMAT_W(7) |
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184 #define REGION_DATA_FORMAT SIZE_FORMAT_W(5) |
0 | 185 |
186 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
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187 size_t dci = c->destination() ? sd.addr_to_region_idx(c->destination()) : 0; |
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188 tty->print_cr(REGION_IDX_FORMAT " " PTR_FORMAT " " |
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189 REGION_IDX_FORMAT " " PTR_FORMAT " " |
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190 REGION_DATA_FORMAT " " REGION_DATA_FORMAT " " |
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191 REGION_DATA_FORMAT " " REGION_IDX_FORMAT " %d", |
0 | 192 i, c->data_location(), dci, c->destination(), |
193 c->partial_obj_size(), c->live_obj_size(), | |
375
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194 c->data_size(), c->source_region(), c->destination_count()); |
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195 |
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196 #undef REGION_IDX_FORMAT |
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197 #undef REGION_DATA_FORMAT |
0 | 198 } |
199 | |
200 void | |
201 print_generic_summary_data(ParallelCompactData& summary_data, | |
202 HeapWord* const beg_addr, | |
203 HeapWord* const end_addr) | |
204 { | |
205 size_t total_words = 0; | |
375
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206 size_t i = summary_data.addr_to_region_idx(beg_addr); |
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207 const size_t last = summary_data.addr_to_region_idx(end_addr); |
0 | 208 HeapWord* pdest = 0; |
209 | |
210 while (i <= last) { | |
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211 ParallelCompactData::RegionData* c = summary_data.region(i); |
0 | 212 if (c->data_size() != 0 || c->destination() != pdest) { |
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213 print_generic_summary_region(i, c); |
0 | 214 total_words += c->data_size(); |
215 pdest = c->destination(); | |
216 } | |
217 ++i; | |
218 } | |
219 | |
220 tty->print_cr("summary_data_bytes=" SIZE_FORMAT, total_words * HeapWordSize); | |
221 } | |
222 | |
223 void | |
224 print_generic_summary_data(ParallelCompactData& summary_data, | |
225 SpaceInfo* space_info) | |
226 { | |
227 for (unsigned int id = 0; id < PSParallelCompact::last_space_id; ++id) { | |
228 const MutableSpace* space = space_info[id].space(); | |
229 print_generic_summary_data(summary_data, space->bottom(), | |
230 MAX2(space->top(), space_info[id].new_top())); | |
231 } | |
232 } | |
233 | |
234 void | |
375
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235 print_initial_summary_region(size_t i, |
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236 const ParallelCompactData::RegionData* c, |
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237 bool newline = true) |
0 | 238 { |
264
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239 tty->print(SIZE_FORMAT_W(5) " " PTR_FORMAT " " |
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240 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " " |
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241 SIZE_FORMAT_W(5) " " SIZE_FORMAT_W(5) " %d", |
0 | 242 i, c->destination(), |
243 c->partial_obj_size(), c->live_obj_size(), | |
375
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244 c->data_size(), c->source_region(), c->destination_count()); |
0 | 245 if (newline) tty->cr(); |
246 } | |
247 | |
248 void | |
249 print_initial_summary_data(ParallelCompactData& summary_data, | |
250 const MutableSpace* space) { | |
251 if (space->top() == space->bottom()) { | |
252 return; | |
253 } | |
254 | |
375
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255 const size_t region_size = ParallelCompactData::RegionSize; |
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256 typedef ParallelCompactData::RegionData RegionData; |
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257 HeapWord* const top_aligned_up = summary_data.region_align_up(space->top()); |
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258 const size_t end_region = summary_data.addr_to_region_idx(top_aligned_up); |
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259 const RegionData* c = summary_data.region(end_region - 1); |
0 | 260 HeapWord* end_addr = c->destination() + c->data_size(); |
261 const size_t live_in_space = pointer_delta(end_addr, space->bottom()); | |
262 | |
375
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263 // Print (and count) the full regions at the beginning of the space. |
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264 size_t full_region_count = 0; |
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265 size_t i = summary_data.addr_to_region_idx(space->bottom()); |
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266 while (i < end_region && summary_data.region(i)->data_size() == region_size) { |
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267 print_initial_summary_region(i, summary_data.region(i)); |
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268 ++full_region_count; |
0 | 269 ++i; |
270 } | |
271 | |
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272 size_t live_to_right = live_in_space - full_region_count * region_size; |
0 | 273 |
274 double max_reclaimed_ratio = 0.0; | |
375
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275 size_t max_reclaimed_ratio_region = 0; |
0 | 276 size_t max_dead_to_right = 0; |
277 size_t max_live_to_right = 0; | |
278 | |
375
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279 // Print the 'reclaimed ratio' for regions while there is something live in |
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280 // the region or to the right of it. The remaining regions are empty (and |
0 | 281 // uninteresting), and computing the ratio will result in division by 0. |
375
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282 while (i < end_region && live_to_right > 0) { |
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283 c = summary_data.region(i); |
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284 HeapWord* const region_addr = summary_data.region_to_addr(i); |
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285 const size_t used_to_right = pointer_delta(space->top(), region_addr); |
0 | 286 const size_t dead_to_right = used_to_right - live_to_right; |
287 const double reclaimed_ratio = double(dead_to_right) / live_to_right; | |
288 | |
289 if (reclaimed_ratio > max_reclaimed_ratio) { | |
290 max_reclaimed_ratio = reclaimed_ratio; | |
375
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291 max_reclaimed_ratio_region = i; |
0 | 292 max_dead_to_right = dead_to_right; |
293 max_live_to_right = live_to_right; | |
294 } | |
295 | |
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296 print_initial_summary_region(i, c, false); |
264
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297 tty->print_cr(" %12.10f " SIZE_FORMAT_W(10) " " SIZE_FORMAT_W(10), |
0 | 298 reclaimed_ratio, dead_to_right, live_to_right); |
299 | |
300 live_to_right -= c->data_size(); | |
301 ++i; | |
302 } | |
303 | |
375
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304 // Any remaining regions are empty. Print one more if there is one. |
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305 if (i < end_region) { |
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306 print_initial_summary_region(i, summary_data.region(i)); |
0 | 307 } |
308 | |
264
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309 tty->print_cr("max: " SIZE_FORMAT_W(4) " d2r=" SIZE_FORMAT_W(10) " " |
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310 "l2r=" SIZE_FORMAT_W(10) " max_ratio=%14.12f", |
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311 max_reclaimed_ratio_region, max_dead_to_right, |
0 | 312 max_live_to_right, max_reclaimed_ratio); |
313 } | |
314 | |
315 void | |
316 print_initial_summary_data(ParallelCompactData& summary_data, | |
317 SpaceInfo* space_info) { | |
318 unsigned int id = PSParallelCompact::perm_space_id; | |
319 const MutableSpace* space; | |
320 do { | |
321 space = space_info[id].space(); | |
322 print_initial_summary_data(summary_data, space); | |
323 } while (++id < PSParallelCompact::eden_space_id); | |
324 | |
325 do { | |
326 space = space_info[id].space(); | |
327 print_generic_summary_data(summary_data, space->bottom(), space->top()); | |
328 } while (++id < PSParallelCompact::last_space_id); | |
329 } | |
330 #endif // #ifndef PRODUCT | |
331 | |
332 #ifdef ASSERT | |
333 size_t add_obj_count; | |
334 size_t add_obj_size; | |
335 size_t mark_bitmap_count; | |
336 size_t mark_bitmap_size; | |
337 #endif // #ifdef ASSERT | |
338 | |
339 ParallelCompactData::ParallelCompactData() | |
340 { | |
341 _region_start = 0; | |
342 | |
375
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343 _region_vspace = 0; |
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344 _region_data = 0; |
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345 _region_count = 0; |
0 | 346 } |
347 | |
348 bool ParallelCompactData::initialize(MemRegion covered_region) | |
349 { | |
350 _region_start = covered_region.start(); | |
351 const size_t region_size = covered_region.word_size(); | |
352 DEBUG_ONLY(_region_end = _region_start + region_size;) | |
353 | |
375
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354 assert(region_align_down(_region_start) == _region_start, |
0 | 355 "region start not aligned"); |
375
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356 assert((region_size & RegionSizeOffsetMask) == 0, |
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357 "region size not a multiple of RegionSize"); |
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358 |
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359 bool result = initialize_region_data(region_size); |
0 | 360 |
361 return result; | |
362 } | |
363 | |
364 PSVirtualSpace* | |
365 ParallelCompactData::create_vspace(size_t count, size_t element_size) | |
366 { | |
367 const size_t raw_bytes = count * element_size; | |
368 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
369 const size_t granularity = os::vm_allocation_granularity(); | |
370 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
371 | |
372 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
373 MAX2(page_sz, granularity); | |
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374 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 375 os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(), |
376 rs.size()); | |
377 PSVirtualSpace* vspace = new PSVirtualSpace(rs, page_sz); | |
378 if (vspace != 0) { | |
379 if (vspace->expand_by(bytes)) { | |
380 return vspace; | |
381 } | |
382 delete vspace; | |
237
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383 // Release memory reserved in the space. |
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384 rs.release(); |
0 | 385 } |
386 | |
387 return 0; | |
388 } | |
389 | |
375
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390 bool ParallelCompactData::initialize_region_data(size_t region_size) |
0 | 391 { |
375
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392 const size_t count = (region_size + RegionSizeOffsetMask) >> Log2RegionSize; |
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393 _region_vspace = create_vspace(count, sizeof(RegionData)); |
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394 if (_region_vspace != 0) { |
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395 _region_data = (RegionData*)_region_vspace->reserved_low_addr(); |
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396 _region_count = count; |
0 | 397 return true; |
398 } | |
399 return false; | |
400 } | |
401 | |
402 void ParallelCompactData::clear() | |
403 { | |
375
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404 memset(_region_data, 0, _region_vspace->committed_size()); |
0 | 405 } |
406 | |
375
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407 void ParallelCompactData::clear_range(size_t beg_region, size_t end_region) { |
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408 assert(beg_region <= _region_count, "beg_region out of range"); |
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409 assert(end_region <= _region_count, "end_region out of range"); |
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410 |
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411 const size_t region_cnt = end_region - beg_region; |
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412 memset(_region_data + beg_region, 0, region_cnt * sizeof(RegionData)); |
0 | 413 } |
414 | |
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415 HeapWord* ParallelCompactData::partial_obj_end(size_t region_idx) const |
0 | 416 { |
375
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417 const RegionData* cur_cp = region(region_idx); |
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418 const RegionData* const end_cp = region(region_count() - 1); |
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419 |
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420 HeapWord* result = region_to_addr(region_idx); |
0 | 421 if (cur_cp < end_cp) { |
422 do { | |
423 result += cur_cp->partial_obj_size(); | |
375
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424 } while (cur_cp->partial_obj_size() == RegionSize && ++cur_cp < end_cp); |
0 | 425 } |
426 return result; | |
427 } | |
428 | |
429 void ParallelCompactData::add_obj(HeapWord* addr, size_t len) | |
430 { | |
431 const size_t obj_ofs = pointer_delta(addr, _region_start); | |
375
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432 const size_t beg_region = obj_ofs >> Log2RegionSize; |
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433 const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize; |
0 | 434 |
435 DEBUG_ONLY(Atomic::inc_ptr(&add_obj_count);) | |
436 DEBUG_ONLY(Atomic::add_ptr(len, &add_obj_size);) | |
437 | |
375
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438 if (beg_region == end_region) { |
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439 // All in one region. |
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440 _region_data[beg_region].add_live_obj(len); |
0 | 441 return; |
442 } | |
443 | |
375
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444 // First region. |
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445 const size_t beg_ofs = region_offset(addr); |
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446 _region_data[beg_region].add_live_obj(RegionSize - beg_ofs); |
0 | 447 |
448 klassOop klass = ((oop)addr)->klass(); | |
375
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449 // Middle regions--completely spanned by this object. |
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450 for (size_t region = beg_region + 1; region < end_region; ++region) { |
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451 _region_data[region].set_partial_obj_size(RegionSize); |
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452 _region_data[region].set_partial_obj_addr(addr); |
0 | 453 } |
454 | |
375
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455 // Last region. |
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456 const size_t end_ofs = region_offset(addr + len - 1); |
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457 _region_data[end_region].set_partial_obj_size(end_ofs + 1); |
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458 _region_data[end_region].set_partial_obj_addr(addr); |
0 | 459 } |
460 | |
461 void | |
462 ParallelCompactData::summarize_dense_prefix(HeapWord* beg, HeapWord* end) | |
463 { | |
375
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464 assert(region_offset(beg) == 0, "not RegionSize aligned"); |
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465 assert(region_offset(end) == 0, "not RegionSize aligned"); |
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466 |
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467 size_t cur_region = addr_to_region_idx(beg); |
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468 const size_t end_region = addr_to_region_idx(end); |
0 | 469 HeapWord* addr = beg; |
375
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470 while (cur_region < end_region) { |
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471 _region_data[cur_region].set_destination(addr); |
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472 _region_data[cur_region].set_destination_count(0); |
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473 _region_data[cur_region].set_source_region(cur_region); |
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474 _region_data[cur_region].set_data_location(addr); |
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475 |
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476 // Update live_obj_size so the region appears completely full. |
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477 size_t live_size = RegionSize - _region_data[cur_region].partial_obj_size(); |
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478 _region_data[cur_region].set_live_obj_size(live_size); |
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479 |
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480 ++cur_region; |
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481 addr += RegionSize; |
0 | 482 } |
483 } | |
484 | |
482
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485 // Find the point at which a space can be split and, if necessary, record the |
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486 // split point. |
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487 // |
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488 // If the current src region (which overflowed the destination space) doesn't |
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489 // have a partial object, the split point is at the beginning of the current src |
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490 // region (an "easy" split, no extra bookkeeping required). |
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491 // |
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492 // If the current src region has a partial object, the split point is in the |
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493 // region where that partial object starts (call it the split_region). If |
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494 // split_region has a partial object, then the split point is just after that |
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495 // partial object (a "hard" split where we have to record the split data and |
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496 // zero the partial_obj_size field). With a "hard" split, we know that the |
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497 // partial_obj ends within split_region because the partial object that caused |
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498 // the overflow starts in split_region. If split_region doesn't have a partial |
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499 // obj, then the split is at the beginning of split_region (another "easy" |
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500 // split). |
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501 HeapWord* |
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502 ParallelCompactData::summarize_split_space(size_t src_region, |
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503 SplitInfo& split_info, |
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504 HeapWord* destination, |
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505 HeapWord* target_end, |
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506 HeapWord** target_next) |
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507 { |
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508 assert(destination <= target_end, "sanity"); |
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509 assert(destination + _region_data[src_region].data_size() > target_end, |
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510 "region should not fit into target space"); |
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511 |
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512 size_t split_region = src_region; |
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513 HeapWord* split_destination = destination; |
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514 size_t partial_obj_size = _region_data[src_region].partial_obj_size(); |
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515 |
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516 if (destination + partial_obj_size > target_end) { |
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517 // The split point is just after the partial object (if any) in the |
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518 // src_region that contains the start of the object that overflowed the |
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519 // destination space. |
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520 // |
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521 // Find the start of the "overflow" object and set split_region to the |
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522 // region containing it. |
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523 HeapWord* const overflow_obj = _region_data[src_region].partial_obj_addr(); |
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524 split_region = addr_to_region_idx(overflow_obj); |
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525 |
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526 // Clear the source_region field of all destination regions whose first word |
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527 // came from data after the split point (a non-null source_region field |
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528 // implies a region must be filled). |
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529 // |
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530 // An alternative to the simple loop below: clear during post_compact(), |
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531 // which uses memcpy instead of individual stores, and is easy to |
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532 // parallelize. (The downside is that it clears the entire RegionData |
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533 // object as opposed to just one field.) |
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534 // |
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535 // post_compact() would have to clear the summary data up to the highest |
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536 // address that was written during the summary phase, which would be |
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537 // |
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538 // max(top, max(new_top, clear_top)) |
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539 // |
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540 // where clear_top is a new field in SpaceInfo. Would have to set clear_top |
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541 // to destination + partial_obj_size, where both have the values passed to |
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542 // this routine. |
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543 const RegionData* const sr = region(split_region); |
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544 const size_t beg_idx = |
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545 addr_to_region_idx(region_align_up(sr->destination() + |
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546 sr->partial_obj_size())); |
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547 const size_t end_idx = |
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548 addr_to_region_idx(region_align_up(destination + partial_obj_size)); |
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549 |
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550 if (TraceParallelOldGCSummaryPhase) { |
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551 gclog_or_tty->print_cr("split: clearing source_region field in [" |
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552 SIZE_FORMAT ", " SIZE_FORMAT ")", |
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553 beg_idx, end_idx); |
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554 } |
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555 for (size_t idx = beg_idx; idx < end_idx; ++idx) { |
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556 _region_data[idx].set_source_region(0); |
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557 } |
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558 |
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559 // Set split_destination and partial_obj_size to reflect the split region. |
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560 split_destination = sr->destination(); |
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561 partial_obj_size = sr->partial_obj_size(); |
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562 } |
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563 |
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564 // The split is recorded only if a partial object extends onto the region. |
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565 if (partial_obj_size != 0) { |
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566 _region_data[split_region].set_partial_obj_size(0); |
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567 split_info.record(split_region, partial_obj_size, split_destination); |
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568 } |
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569 |
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570 // Setup the continuation addresses. |
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571 *target_next = split_destination + partial_obj_size; |
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572 HeapWord* const source_next = region_to_addr(split_region) + partial_obj_size; |
0 | 573 |
574 if (TraceParallelOldGCSummaryPhase) { | |
482
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575 const char * split_type = partial_obj_size == 0 ? "easy" : "hard"; |
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576 gclog_or_tty->print_cr("%s split: src=" PTR_FORMAT " src_c=" SIZE_FORMAT |
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577 " pos=" SIZE_FORMAT, |
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578 split_type, source_next, split_region, |
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579 partial_obj_size); |
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580 gclog_or_tty->print_cr("%s split: dst=" PTR_FORMAT " dst_c=" SIZE_FORMAT |
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581 " tn=" PTR_FORMAT, |
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582 split_type, split_destination, |
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583 addr_to_region_idx(split_destination), |
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584 *target_next); |
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585 |
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586 if (partial_obj_size != 0) { |
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587 HeapWord* const po_beg = split_info.destination(); |
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588 HeapWord* const po_end = po_beg + split_info.partial_obj_size(); |
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589 gclog_or_tty->print_cr("%s split: " |
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590 "po_beg=" PTR_FORMAT " " SIZE_FORMAT " " |
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591 "po_end=" PTR_FORMAT " " SIZE_FORMAT, |
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592 split_type, |
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593 po_beg, addr_to_region_idx(po_beg), |
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594 po_end, addr_to_region_idx(po_end)); |
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595 } |
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596 } |
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597 |
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598 return source_next; |
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599 } |
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600 |
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601 bool ParallelCompactData::summarize(SplitInfo& split_info, |
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602 HeapWord* source_beg, HeapWord* source_end, |
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603 HeapWord** source_next, |
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604 HeapWord* target_beg, HeapWord* target_end, |
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605 HeapWord** target_next) |
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606 { |
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607 if (TraceParallelOldGCSummaryPhase) { |
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608 HeapWord* const source_next_val = source_next == NULL ? NULL : *source_next; |
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609 tty->print_cr("sb=" PTR_FORMAT " se=" PTR_FORMAT " sn=" PTR_FORMAT |
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610 "tb=" PTR_FORMAT " te=" PTR_FORMAT " tn=" PTR_FORMAT, |
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611 source_beg, source_end, source_next_val, |
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612 target_beg, target_end, *target_next); |
0 | 613 } |
614 | |
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615 size_t cur_region = addr_to_region_idx(source_beg); |
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616 const size_t end_region = addr_to_region_idx(region_align_up(source_end)); |
0 | 617 |
618 HeapWord *dest_addr = target_beg; | |
375
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619 while (cur_region < end_region) { |
482
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620 // The destination must be set even if the region has no data. |
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621 _region_data[cur_region].set_destination(dest_addr); |
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622 |
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623 size_t words = _region_data[cur_region].data_size(); |
0 | 624 if (words > 0) { |
482
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625 // If cur_region does not fit entirely into the target space, find a point |
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626 // at which the source space can be 'split' so that part is copied to the |
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627 // target space and the rest is copied elsewhere. |
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628 if (dest_addr + words > target_end) { |
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629 assert(source_next != NULL, "source_next is NULL when splitting"); |
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630 *source_next = summarize_split_space(cur_region, split_info, dest_addr, |
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631 target_end, target_next); |
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632 return false; |
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633 } |
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634 |
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635 // Compute the destination_count for cur_region, and if necessary, update |
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636 // source_region for a destination region. The source_region field is |
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637 // updated if cur_region is the first (left-most) region to be copied to a |
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638 // destination region. |
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639 // |
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640 // The destination_count calculation is a bit subtle. A region that has |
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641 // data that compacts into itself does not count itself as a destination. |
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642 // This maintains the invariant that a zero count means the region is |
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643 // available and can be claimed and then filled. |
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644 uint destination_count = 0; |
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645 if (split_info.is_split(cur_region)) { |
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646 // The current region has been split: the partial object will be copied |
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647 // to one destination space and the remaining data will be copied to |
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648 // another destination space. Adjust the initial destination_count and, |
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649 // if necessary, set the source_region field if the partial object will |
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650 // cross a destination region boundary. |
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651 destination_count = split_info.destination_count(); |
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652 if (destination_count == 2) { |
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653 size_t dest_idx = addr_to_region_idx(split_info.dest_region_addr()); |
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654 _region_data[dest_idx].set_source_region(cur_region); |
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655 } |
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656 } |
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657 |
0 | 658 HeapWord* const last_addr = dest_addr + words - 1; |
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659 const size_t dest_region_1 = addr_to_region_idx(dest_addr); |
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660 const size_t dest_region_2 = addr_to_region_idx(last_addr); |
482
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661 |
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662 // Initially assume that the destination regions will be the same and |
0 | 663 // adjust the value below if necessary. Under this assumption, if |
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664 // cur_region == dest_region_2, then cur_region will be compacted |
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665 // completely into itself. |
482
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666 destination_count += cur_region == dest_region_2 ? 0 : 1; |
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667 if (dest_region_1 != dest_region_2) { |
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668 // Destination regions differ; adjust destination_count. |
0 | 669 destination_count += 1; |
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670 // Data from cur_region will be copied to the start of dest_region_2. |
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671 _region_data[dest_region_2].set_source_region(cur_region); |
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672 } else if (region_offset(dest_addr) == 0) { |
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673 // Data from cur_region will be copied to the start of the destination |
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674 // region. |
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675 _region_data[dest_region_1].set_source_region(cur_region); |
0 | 676 } |
677 | |
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678 _region_data[cur_region].set_destination_count(destination_count); |
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679 _region_data[cur_region].set_data_location(region_to_addr(cur_region)); |
0 | 680 dest_addr += words; |
681 } | |
682 | |
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683 ++cur_region; |
0 | 684 } |
685 | |
686 *target_next = dest_addr; | |
687 return true; | |
688 } | |
689 | |
690 HeapWord* ParallelCompactData::calc_new_pointer(HeapWord* addr) { | |
691 assert(addr != NULL, "Should detect NULL oop earlier"); | |
692 assert(PSParallelCompact::gc_heap()->is_in(addr), "addr not in heap"); | |
693 #ifdef ASSERT | |
694 if (PSParallelCompact::mark_bitmap()->is_unmarked(addr)) { | |
695 gclog_or_tty->print_cr("calc_new_pointer:: addr " PTR_FORMAT, addr); | |
696 } | |
697 #endif | |
698 assert(PSParallelCompact::mark_bitmap()->is_marked(addr), "obj not marked"); | |
699 | |
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700 // Region covering the object. |
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701 size_t region_index = addr_to_region_idx(addr); |
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702 const RegionData* const region_ptr = region(region_index); |
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703 HeapWord* const region_addr = region_align_down(addr); |
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704 |
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705 assert(addr < region_addr + RegionSize, "Region does not cover object"); |
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706 assert(addr_to_region_ptr(region_addr) == region_ptr, "sanity check"); |
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707 |
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708 HeapWord* result = region_ptr->destination(); |
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709 |
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710 // If all the data in the region is live, then the new location of the object |
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711 // can be calculated from the destination of the region plus the offset of the |
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712 // object in the region. |
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713 if (region_ptr->data_size() == RegionSize) { |
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714 result += pointer_delta(addr, region_addr); |
0 | 715 return result; |
716 } | |
717 | |
718 // The new location of the object is | |
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719 // region destination + |
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720 // size of the partial object extending onto the region + |
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721 // sizes of the live objects in the Region that are to the left of addr |
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722 const size_t partial_obj_size = region_ptr->partial_obj_size(); |
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723 HeapWord* const search_start = region_addr + partial_obj_size; |
0 | 724 |
725 const ParMarkBitMap* bitmap = PSParallelCompact::mark_bitmap(); | |
726 size_t live_to_left = bitmap->live_words_in_range(search_start, oop(addr)); | |
727 | |
728 result += partial_obj_size + live_to_left; | |
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729 DEBUG_ONLY(PSParallelCompact::check_new_location(addr, result);) |
0 | 730 return result; |
731 } | |
732 | |
733 klassOop ParallelCompactData::calc_new_klass(klassOop old_klass) { | |
734 klassOop updated_klass; | |
735 if (PSParallelCompact::should_update_klass(old_klass)) { | |
736 updated_klass = (klassOop) calc_new_pointer(old_klass); | |
737 } else { | |
738 updated_klass = old_klass; | |
739 } | |
740 | |
741 return updated_klass; | |
742 } | |
743 | |
744 #ifdef ASSERT | |
745 void ParallelCompactData::verify_clear(const PSVirtualSpace* vspace) | |
746 { | |
747 const size_t* const beg = (const size_t*)vspace->committed_low_addr(); | |
748 const size_t* const end = (const size_t*)vspace->committed_high_addr(); | |
749 for (const size_t* p = beg; p < end; ++p) { | |
750 assert(*p == 0, "not zero"); | |
751 } | |
752 } | |
753 | |
754 void ParallelCompactData::verify_clear() | |
755 { | |
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756 verify_clear(_region_vspace); |
0 | 757 } |
758 #endif // #ifdef ASSERT | |
759 | |
760 #ifdef NOT_PRODUCT | |
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761 ParallelCompactData::RegionData* debug_region(size_t region_index) { |
0 | 762 ParallelCompactData& sd = PSParallelCompact::summary_data(); |
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763 return sd.region(region_index); |
0 | 764 } |
765 #endif | |
766 | |
767 elapsedTimer PSParallelCompact::_accumulated_time; | |
768 unsigned int PSParallelCompact::_total_invocations = 0; | |
769 unsigned int PSParallelCompact::_maximum_compaction_gc_num = 0; | |
770 jlong PSParallelCompact::_time_of_last_gc = 0; | |
771 CollectorCounters* PSParallelCompact::_counters = NULL; | |
772 ParMarkBitMap PSParallelCompact::_mark_bitmap; | |
773 ParallelCompactData PSParallelCompact::_summary_data; | |
774 | |
775 PSParallelCompact::IsAliveClosure PSParallelCompact::_is_alive_closure; | |
113
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776 |
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777 void PSParallelCompact::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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778 bool PSParallelCompact::IsAliveClosure::do_object_b(oop p) { return mark_bitmap()->is_marked(p); } |
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779 |
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780 void PSParallelCompact::KeepAliveClosure::do_oop(oop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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781 void PSParallelCompact::KeepAliveClosure::do_oop(narrowOop* p) { PSParallelCompact::KeepAliveClosure::do_oop_work(p); } |
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782 |
0 | 783 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_root_pointer_closure(true); |
784 PSParallelCompact::AdjustPointerClosure PSParallelCompact::_adjust_pointer_closure(false); | |
785 | |
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786 void PSParallelCompact::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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787 void PSParallelCompact::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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788 |
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789 void PSParallelCompact::FollowStackClosure::do_void() { follow_stack(_compaction_manager); } |
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790 |
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791 void PSParallelCompact::MarkAndPushClosure::do_oop(oop* p) { mark_and_push(_compaction_manager, p); } |
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792 void PSParallelCompact::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(_compaction_manager, p); } |
0 | 793 |
794 void PSParallelCompact::post_initialize() { | |
795 ParallelScavengeHeap* heap = gc_heap(); | |
796 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
797 | |
798 MemRegion mr = heap->reserved_region(); | |
799 _ref_processor = ReferenceProcessor::create_ref_processor( | |
800 mr, // span | |
801 true, // atomic_discovery | |
802 true, // mt_discovery | |
803 &_is_alive_closure, | |
804 ParallelGCThreads, | |
805 ParallelRefProcEnabled); | |
806 _counters = new CollectorCounters("PSParallelCompact", 1); | |
807 | |
808 // Initialize static fields in ParCompactionManager. | |
809 ParCompactionManager::initialize(mark_bitmap()); | |
810 } | |
811 | |
812 bool PSParallelCompact::initialize() { | |
813 ParallelScavengeHeap* heap = gc_heap(); | |
814 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
815 MemRegion mr = heap->reserved_region(); | |
816 | |
817 // Was the old gen get allocated successfully? | |
818 if (!heap->old_gen()->is_allocated()) { | |
819 return false; | |
820 } | |
821 | |
822 initialize_space_info(); | |
823 initialize_dead_wood_limiter(); | |
824 | |
825 if (!_mark_bitmap.initialize(mr)) { | |
826 vm_shutdown_during_initialization("Unable to allocate bit map for " | |
827 "parallel garbage collection for the requested heap size."); | |
828 return false; | |
829 } | |
830 | |
831 if (!_summary_data.initialize(mr)) { | |
832 vm_shutdown_during_initialization("Unable to allocate tables for " | |
833 "parallel garbage collection for the requested heap size."); | |
834 return false; | |
835 } | |
836 | |
837 return true; | |
838 } | |
839 | |
840 void PSParallelCompact::initialize_space_info() | |
841 { | |
842 memset(&_space_info, 0, sizeof(_space_info)); | |
843 | |
844 ParallelScavengeHeap* heap = gc_heap(); | |
845 PSYoungGen* young_gen = heap->young_gen(); | |
846 MutableSpace* perm_space = heap->perm_gen()->object_space(); | |
847 | |
848 _space_info[perm_space_id].set_space(perm_space); | |
849 _space_info[old_space_id].set_space(heap->old_gen()->object_space()); | |
850 _space_info[eden_space_id].set_space(young_gen->eden_space()); | |
851 _space_info[from_space_id].set_space(young_gen->from_space()); | |
852 _space_info[to_space_id].set_space(young_gen->to_space()); | |
853 | |
854 _space_info[perm_space_id].set_start_array(heap->perm_gen()->start_array()); | |
855 _space_info[old_space_id].set_start_array(heap->old_gen()->start_array()); | |
856 | |
857 _space_info[perm_space_id].set_min_dense_prefix(perm_space->top()); | |
858 if (TraceParallelOldGCDensePrefix) { | |
859 tty->print_cr("perm min_dense_prefix=" PTR_FORMAT, | |
860 _space_info[perm_space_id].min_dense_prefix()); | |
861 } | |
862 } | |
863 | |
864 void PSParallelCompact::initialize_dead_wood_limiter() | |
865 { | |
866 const size_t max = 100; | |
867 _dwl_mean = double(MIN2(ParallelOldDeadWoodLimiterMean, max)) / 100.0; | |
868 _dwl_std_dev = double(MIN2(ParallelOldDeadWoodLimiterStdDev, max)) / 100.0; | |
869 _dwl_first_term = 1.0 / (sqrt(2.0 * M_PI) * _dwl_std_dev); | |
870 DEBUG_ONLY(_dwl_initialized = true;) | |
871 _dwl_adjustment = normal_distribution(1.0); | |
872 } | |
873 | |
874 // Simple class for storing info about the heap at the start of GC, to be used | |
875 // after GC for comparison/printing. | |
876 class PreGCValues { | |
877 public: | |
878 PreGCValues() { } | |
879 PreGCValues(ParallelScavengeHeap* heap) { fill(heap); } | |
880 | |
881 void fill(ParallelScavengeHeap* heap) { | |
882 _heap_used = heap->used(); | |
883 _young_gen_used = heap->young_gen()->used_in_bytes(); | |
884 _old_gen_used = heap->old_gen()->used_in_bytes(); | |
885 _perm_gen_used = heap->perm_gen()->used_in_bytes(); | |
886 }; | |
887 | |
888 size_t heap_used() const { return _heap_used; } | |
889 size_t young_gen_used() const { return _young_gen_used; } | |
890 size_t old_gen_used() const { return _old_gen_used; } | |
891 size_t perm_gen_used() const { return _perm_gen_used; } | |
892 | |
893 private: | |
894 size_t _heap_used; | |
895 size_t _young_gen_used; | |
896 size_t _old_gen_used; | |
897 size_t _perm_gen_used; | |
898 }; | |
899 | |
900 void | |
901 PSParallelCompact::clear_data_covering_space(SpaceId id) | |
902 { | |
903 // At this point, top is the value before GC, new_top() is the value that will | |
904 // be set at the end of GC. The marking bitmap is cleared to top; nothing | |
905 // should be marked above top. The summary data is cleared to the larger of | |
906 // top & new_top. | |
907 MutableSpace* const space = _space_info[id].space(); | |
908 HeapWord* const bot = space->bottom(); | |
909 HeapWord* const top = space->top(); | |
910 HeapWord* const max_top = MAX2(top, _space_info[id].new_top()); | |
911 | |
912 const idx_t beg_bit = _mark_bitmap.addr_to_bit(bot); | |
913 const idx_t end_bit = BitMap::word_align_up(_mark_bitmap.addr_to_bit(top)); | |
914 _mark_bitmap.clear_range(beg_bit, end_bit); | |
915 | |
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916 const size_t beg_region = _summary_data.addr_to_region_idx(bot); |
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917 const size_t end_region = |
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918 _summary_data.addr_to_region_idx(_summary_data.region_align_up(max_top)); |
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919 _summary_data.clear_range(beg_region, end_region); |
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920 |
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921 // Clear the data used to 'split' regions. |
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922 SplitInfo& split_info = _space_info[id].split_info(); |
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923 if (split_info.is_valid()) { |
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924 split_info.clear(); |
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925 } |
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926 DEBUG_ONLY(split_info.verify_clear();) |
0 | 927 } |
928 | |
929 void PSParallelCompact::pre_compact(PreGCValues* pre_gc_values) | |
930 { | |
931 // Update the from & to space pointers in space_info, since they are swapped | |
932 // at each young gen gc. Do the update unconditionally (even though a | |
933 // promotion failure does not swap spaces) because an unknown number of minor | |
934 // collections will have swapped the spaces an unknown number of times. | |
935 TraceTime tm("pre compact", print_phases(), true, gclog_or_tty); | |
936 ParallelScavengeHeap* heap = gc_heap(); | |
937 _space_info[from_space_id].set_space(heap->young_gen()->from_space()); | |
938 _space_info[to_space_id].set_space(heap->young_gen()->to_space()); | |
939 | |
940 pre_gc_values->fill(heap); | |
941 | |
942 ParCompactionManager::reset(); | |
943 NOT_PRODUCT(_mark_bitmap.reset_counters()); | |
944 DEBUG_ONLY(add_obj_count = add_obj_size = 0;) | |
945 DEBUG_ONLY(mark_bitmap_count = mark_bitmap_size = 0;) | |
946 | |
947 // Increment the invocation count | |
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948 heap->increment_total_collections(true); |
0 | 949 |
950 // We need to track unique mark sweep invocations as well. | |
951 _total_invocations++; | |
952 | |
953 if (PrintHeapAtGC) { | |
954 Universe::print_heap_before_gc(); | |
955 } | |
956 | |
957 // Fill in TLABs | |
958 heap->accumulate_statistics_all_tlabs(); | |
959 heap->ensure_parsability(true); // retire TLABs | |
960 | |
961 if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) { | |
962 HandleMark hm; // Discard invalid handles created during verification | |
963 gclog_or_tty->print(" VerifyBeforeGC:"); | |
964 Universe::verify(true); | |
965 } | |
966 | |
967 // Verify object start arrays | |
968 if (VerifyObjectStartArray && | |
969 VerifyBeforeGC) { | |
970 heap->old_gen()->verify_object_start_array(); | |
971 heap->perm_gen()->verify_object_start_array(); | |
972 } | |
973 | |
974 DEBUG_ONLY(mark_bitmap()->verify_clear();) | |
975 DEBUG_ONLY(summary_data().verify_clear();) | |
210 | 976 |
977 // Have worker threads release resources the next time they run a task. | |
978 gc_task_manager()->release_all_resources(); | |
0 | 979 } |
980 | |
981 void PSParallelCompact::post_compact() | |
982 { | |
983 TraceTime tm("post compact", print_phases(), true, gclog_or_tty); | |
984 | |
985 for (unsigned int id = perm_space_id; id < last_space_id; ++id) { | |
482
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986 // Clear the marking bitmap, summary data and split info. |
0 | 987 clear_data_covering_space(SpaceId(id)); |
482
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988 // Update top(). Must be done after clearing the bitmap and summary data. |
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989 _space_info[id].publish_new_top(); |
0 | 990 } |
991 | |
992 MutableSpace* const eden_space = _space_info[eden_space_id].space(); | |
993 MutableSpace* const from_space = _space_info[from_space_id].space(); | |
994 MutableSpace* const to_space = _space_info[to_space_id].space(); | |
995 | |
996 ParallelScavengeHeap* heap = gc_heap(); | |
997 bool eden_empty = eden_space->is_empty(); | |
998 if (!eden_empty) { | |
999 eden_empty = absorb_live_data_from_eden(heap->size_policy(), | |
1000 heap->young_gen(), heap->old_gen()); | |
1001 } | |
1002 | |
1003 // Update heap occupancy information which is used as input to the soft ref | |
1004 // clearing policy at the next gc. | |
1005 Universe::update_heap_info_at_gc(); | |
1006 | |
1007 bool young_gen_empty = eden_empty && from_space->is_empty() && | |
1008 to_space->is_empty(); | |
1009 | |
1010 BarrierSet* bs = heap->barrier_set(); | |
1011 if (bs->is_a(BarrierSet::ModRef)) { | |
1012 ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs; | |
1013 MemRegion old_mr = heap->old_gen()->reserved(); | |
1014 MemRegion perm_mr = heap->perm_gen()->reserved(); | |
1015 assert(perm_mr.end() <= old_mr.start(), "Generations out of order"); | |
1016 | |
1017 if (young_gen_empty) { | |
1018 modBS->clear(MemRegion(perm_mr.start(), old_mr.end())); | |
1019 } else { | |
1020 modBS->invalidate(MemRegion(perm_mr.start(), old_mr.end())); | |
1021 } | |
1022 } | |
1023 | |
1024 Threads::gc_epilogue(); | |
1025 CodeCache::gc_epilogue(); | |
1026 | |
1027 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1028 | |
1029 ref_processor()->enqueue_discovered_references(NULL); | |
1030 | |
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1031 if (ZapUnusedHeapArea) { |
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1032 heap->gen_mangle_unused_area(); |
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1033 } |
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1034 |
0 | 1035 // Update time of last GC |
1036 reset_millis_since_last_gc(); | |
1037 } | |
1038 | |
1039 HeapWord* | |
1040 PSParallelCompact::compute_dense_prefix_via_density(const SpaceId id, | |
1041 bool maximum_compaction) | |
1042 { | |
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1043 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1044 const ParallelCompactData& sd = summary_data(); |
1045 | |
1046 const MutableSpace* const space = _space_info[id].space(); | |
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1047 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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1048 const RegionData* const beg_cp = sd.addr_to_region_ptr(space->bottom()); |
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1049 const RegionData* const end_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1050 |
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1051 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1052 // of the dense prefix. |
1053 size_t full_count = 0; | |
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1054 const RegionData* cp; |
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1055 for (cp = beg_cp; cp < end_cp && cp->data_size() == region_size; ++cp) { |
0 | 1056 ++full_count; |
1057 } | |
1058 | |
1059 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1060 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1061 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval; | |
1062 if (maximum_compaction || cp == end_cp || interval_ended) { | |
1063 _maximum_compaction_gc_num = total_invocations(); | |
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1064 return sd.region_to_addr(cp); |
0 | 1065 } |
1066 | |
1067 HeapWord* const new_top = _space_info[id].new_top(); | |
1068 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1069 const size_t space_used = space->used_in_words(); | |
1070 const size_t space_capacity = space->capacity_in_words(); | |
1071 | |
1072 const double cur_density = double(space_live) / space_capacity; | |
1073 const double deadwood_density = | |
1074 (1.0 - cur_density) * (1.0 - cur_density) * cur_density * cur_density; | |
1075 const size_t deadwood_goal = size_t(space_capacity * deadwood_density); | |
1076 | |
1077 if (TraceParallelOldGCDensePrefix) { | |
1078 tty->print_cr("cur_dens=%5.3f dw_dens=%5.3f dw_goal=" SIZE_FORMAT, | |
1079 cur_density, deadwood_density, deadwood_goal); | |
1080 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1081 "space_cap=" SIZE_FORMAT, | |
1082 space_live, space_used, | |
1083 space_capacity); | |
1084 } | |
1085 | |
1086 // XXX - Use binary search? | |
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1087 HeapWord* dense_prefix = sd.region_to_addr(cp); |
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1088 const RegionData* full_cp = cp; |
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1089 const RegionData* const top_cp = sd.addr_to_region_ptr(space->top() - 1); |
0 | 1090 while (cp < end_cp) { |
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1091 HeapWord* region_destination = cp->destination(); |
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1092 const size_t cur_deadwood = pointer_delta(dense_prefix, region_destination); |
0 | 1093 if (TraceParallelOldGCDensePrefix && Verbose) { |
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1094 tty->print_cr("c#=" SIZE_FORMAT_W(4) " dst=" PTR_FORMAT " " |
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1095 "dp=" SIZE_FORMAT_W(8) " " "cdw=" SIZE_FORMAT_W(8), |
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1096 sd.region(cp), region_destination, |
0 | 1097 dense_prefix, cur_deadwood); |
1098 } | |
1099 | |
1100 if (cur_deadwood >= deadwood_goal) { | |
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1101 // Found the region that has the correct amount of deadwood to the left. |
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1102 // This typically occurs after crossing a fairly sparse set of regions, so |
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1103 // iterate backwards over those sparse regions, looking for the region |
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1104 // that has the lowest density of live objects 'to the right.' |
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1105 size_t space_to_left = sd.region(cp) * region_size; |
0 | 1106 size_t live_to_left = space_to_left - cur_deadwood; |
1107 size_t space_to_right = space_capacity - space_to_left; | |
1108 size_t live_to_right = space_live - live_to_left; | |
1109 double density_to_right = double(live_to_right) / space_to_right; | |
1110 while (cp > full_cp) { | |
1111 --cp; | |
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1112 const size_t prev_region_live_to_right = live_to_right - |
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1113 cp->data_size(); |
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1114 const size_t prev_region_space_to_right = space_to_right + region_size; |
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1115 double prev_region_density_to_right = |
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1116 double(prev_region_live_to_right) / prev_region_space_to_right; |
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1117 if (density_to_right <= prev_region_density_to_right) { |
0 | 1118 return dense_prefix; |
1119 } | |
1120 if (TraceParallelOldGCDensePrefix && Verbose) { | |
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1121 tty->print_cr("backing up from c=" SIZE_FORMAT_W(4) " d2r=%10.8f " |
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1122 "pc_d2r=%10.8f", sd.region(cp), density_to_right, |
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1123 prev_region_density_to_right); |
0 | 1124 } |
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1125 dense_prefix -= region_size; |
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1126 live_to_right = prev_region_live_to_right; |
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1127 space_to_right = prev_region_space_to_right; |
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1128 density_to_right = prev_region_density_to_right; |
0 | 1129 } |
1130 return dense_prefix; | |
1131 } | |
1132 | |
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1133 dense_prefix += region_size; |
0 | 1134 ++cp; |
1135 } | |
1136 | |
1137 return dense_prefix; | |
1138 } | |
1139 | |
1140 #ifndef PRODUCT | |
1141 void PSParallelCompact::print_dense_prefix_stats(const char* const algorithm, | |
1142 const SpaceId id, | |
1143 const bool maximum_compaction, | |
1144 HeapWord* const addr) | |
1145 { | |
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1146 const size_t region_idx = summary_data().addr_to_region_idx(addr); |
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1147 RegionData* const cp = summary_data().region(region_idx); |
0 | 1148 const MutableSpace* const space = _space_info[id].space(); |
1149 HeapWord* const new_top = _space_info[id].new_top(); | |
1150 | |
1151 const size_t space_live = pointer_delta(new_top, space->bottom()); | |
1152 const size_t dead_to_left = pointer_delta(addr, cp->destination()); | |
1153 const size_t space_cap = space->capacity_in_words(); | |
1154 const double dead_to_left_pct = double(dead_to_left) / space_cap; | |
1155 const size_t live_to_right = new_top - cp->destination(); | |
1156 const size_t dead_to_right = space->top() - addr - live_to_right; | |
1157 | |
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1158 tty->print_cr("%s=" PTR_FORMAT " dpc=" SIZE_FORMAT_W(5) " " |
0 | 1159 "spl=" SIZE_FORMAT " " |
1160 "d2l=" SIZE_FORMAT " d2l%%=%6.4f " | |
1161 "d2r=" SIZE_FORMAT " l2r=" SIZE_FORMAT | |
1162 " ratio=%10.8f", | |
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1163 algorithm, addr, region_idx, |
0 | 1164 space_live, |
1165 dead_to_left, dead_to_left_pct, | |
1166 dead_to_right, live_to_right, | |
1167 double(dead_to_right) / live_to_right); | |
1168 } | |
1169 #endif // #ifndef PRODUCT | |
1170 | |
1171 // Return a fraction indicating how much of the generation can be treated as | |
1172 // "dead wood" (i.e., not reclaimed). The function uses a normal distribution | |
1173 // based on the density of live objects in the generation to determine a limit, | |
1174 // which is then adjusted so the return value is min_percent when the density is | |
1175 // 1. | |
1176 // | |
1177 // The following table shows some return values for a different values of the | |
1178 // standard deviation (ParallelOldDeadWoodLimiterStdDev); the mean is 0.5 and | |
1179 // min_percent is 1. | |
1180 // | |
1181 // fraction allowed as dead wood | |
1182 // ----------------------------------------------------------------- | |
1183 // density std_dev=70 std_dev=75 std_dev=80 std_dev=85 std_dev=90 std_dev=95 | |
1184 // ------- ---------- ---------- ---------- ---------- ---------- ---------- | |
1185 // 0.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1186 // 0.05000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1187 // 0.10000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1188 // 0.15000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1189 // 0.20000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1190 // 0.25000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1191 // 0.30000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1192 // 0.35000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1193 // 0.40000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1194 // 0.45000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1195 // 0.50000 0.13832410 0.11599237 0.09847664 0.08456518 0.07338887 0.06431510 | |
1196 // 0.55000 0.13687208 0.11481163 0.09750361 0.08375387 0.07270534 0.06373386 | |
1197 // 0.60000 0.13253818 0.11128511 0.09459590 0.08132834 0.07066107 0.06199500 | |
1198 // 0.65000 0.12538832 0.10545958 0.08978741 0.07731366 0.06727491 0.05911289 | |
1199 // 0.70000 0.11553050 0.09741183 0.08313394 0.07175114 0.06257797 0.05511132 | |
1200 // 0.75000 0.10311208 0.08724696 0.07471205 0.06469760 0.05661313 0.05002313 | |
1201 // 0.80000 0.08831616 0.07509618 0.06461766 0.05622444 0.04943437 0.04388975 | |
1202 // 0.85000 0.07135702 0.06111390 0.05296419 0.04641639 0.04110601 0.03676066 | |
1203 // 0.90000 0.05247504 0.04547452 0.03988045 0.03537016 0.03170171 0.02869272 | |
1204 // 0.95000 0.03193096 0.02836880 0.02550828 0.02319280 0.02130337 0.01974941 | |
1205 // 1.00000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 0.01000000 | |
1206 | |
1207 double PSParallelCompact::dead_wood_limiter(double density, size_t min_percent) | |
1208 { | |
1209 assert(_dwl_initialized, "uninitialized"); | |
1210 | |
1211 // The raw limit is the value of the normal distribution at x = density. | |
1212 const double raw_limit = normal_distribution(density); | |
1213 | |
1214 // Adjust the raw limit so it becomes the minimum when the density is 1. | |
1215 // | |
1216 // First subtract the adjustment value (which is simply the precomputed value | |
1217 // normal_distribution(1.0)); this yields a value of 0 when the density is 1. | |
1218 // Then add the minimum value, so the minimum is returned when the density is | |
1219 // 1. Finally, prevent negative values, which occur when the mean is not 0.5. | |
1220 const double min = double(min_percent) / 100.0; | |
1221 const double limit = raw_limit - _dwl_adjustment + min; | |
1222 return MAX2(limit, 0.0); | |
1223 } | |
1224 | |
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1225 ParallelCompactData::RegionData* |
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1226 PSParallelCompact::first_dead_space_region(const RegionData* beg, |
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1227 const RegionData* end) |
0 | 1228 { |
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1229 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1230 ParallelCompactData& sd = summary_data(); |
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1231 size_t left = sd.region(beg); |
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1232 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1233 |
1234 // Binary search. | |
1235 while (left < right) { | |
1236 // Equivalent to (left + right) / 2, but does not overflow. | |
1237 const size_t middle = left + (right - left) / 2; | |
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1238 RegionData* const middle_ptr = sd.region(middle); |
0 | 1239 HeapWord* const dest = middle_ptr->destination(); |
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1240 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1241 assert(dest != NULL, "sanity"); |
1242 assert(dest <= addr, "must move left"); | |
1243 | |
1244 if (middle > left && dest < addr) { | |
1245 right = middle - 1; | |
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1246 } else if (middle < right && middle_ptr->data_size() == region_size) { |
0 | 1247 left = middle + 1; |
1248 } else { | |
1249 return middle_ptr; | |
1250 } | |
1251 } | |
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1252 return sd.region(left); |
0 | 1253 } |
1254 | |
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1255 ParallelCompactData::RegionData* |
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1256 PSParallelCompact::dead_wood_limit_region(const RegionData* beg, |
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1257 const RegionData* end, |
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1258 size_t dead_words) |
0 | 1259 { |
1260 ParallelCompactData& sd = summary_data(); | |
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1261 size_t left = sd.region(beg); |
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1262 size_t right = end > beg ? sd.region(end) - 1 : left; |
0 | 1263 |
1264 // Binary search. | |
1265 while (left < right) { | |
1266 // Equivalent to (left + right) / 2, but does not overflow. | |
1267 const size_t middle = left + (right - left) / 2; | |
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1268 RegionData* const middle_ptr = sd.region(middle); |
0 | 1269 HeapWord* const dest = middle_ptr->destination(); |
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1270 HeapWord* const addr = sd.region_to_addr(middle); |
0 | 1271 assert(dest != NULL, "sanity"); |
1272 assert(dest <= addr, "must move left"); | |
1273 | |
1274 const size_t dead_to_left = pointer_delta(addr, dest); | |
1275 if (middle > left && dead_to_left > dead_words) { | |
1276 right = middle - 1; | |
1277 } else if (middle < right && dead_to_left < dead_words) { | |
1278 left = middle + 1; | |
1279 } else { | |
1280 return middle_ptr; | |
1281 } | |
1282 } | |
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1283 return sd.region(left); |
0 | 1284 } |
1285 | |
1286 // The result is valid during the summary phase, after the initial summarization | |
1287 // of each space into itself, and before final summarization. | |
1288 inline double | |
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1289 PSParallelCompact::reclaimed_ratio(const RegionData* const cp, |
0 | 1290 HeapWord* const bottom, |
1291 HeapWord* const top, | |
1292 HeapWord* const new_top) | |
1293 { | |
1294 ParallelCompactData& sd = summary_data(); | |
1295 | |
1296 assert(cp != NULL, "sanity"); | |
1297 assert(bottom != NULL, "sanity"); | |
1298 assert(top != NULL, "sanity"); | |
1299 assert(new_top != NULL, "sanity"); | |
1300 assert(top >= new_top, "summary data problem?"); | |
1301 assert(new_top > bottom, "space is empty; should not be here"); | |
1302 assert(new_top >= cp->destination(), "sanity"); | |
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1303 assert(top >= sd.region_to_addr(cp), "sanity"); |
0 | 1304 |
1305 HeapWord* const destination = cp->destination(); | |
1306 const size_t dense_prefix_live = pointer_delta(destination, bottom); | |
1307 const size_t compacted_region_live = pointer_delta(new_top, destination); | |
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1308 const size_t compacted_region_used = pointer_delta(top, |
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1309 sd.region_to_addr(cp)); |
0 | 1310 const size_t reclaimable = compacted_region_used - compacted_region_live; |
1311 | |
1312 const double divisor = dense_prefix_live + 1.25 * compacted_region_live; | |
1313 return double(reclaimable) / divisor; | |
1314 } | |
1315 | |
1316 // Return the address of the end of the dense prefix, a.k.a. the start of the | |
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1317 // compacted region. The address is always on a region boundary. |
0 | 1318 // |
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1319 // Completely full regions at the left are skipped, since no compaction can |
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1320 // occur in those regions. Then the maximum amount of dead wood to allow is |
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1321 // computed, based on the density (amount live / capacity) of the generation; |
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1322 // the region with approximately that amount of dead space to the left is |
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1323 // identified as the limit region. Regions between the last completely full |
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1324 // region and the limit region are scanned and the one that has the best |
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1325 // (maximum) reclaimed_ratio() is selected. |
0 | 1326 HeapWord* |
1327 PSParallelCompact::compute_dense_prefix(const SpaceId id, | |
1328 bool maximum_compaction) | |
1329 { | |
483
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1330 if (ParallelOldGCSplitALot) { |
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1331 if (_space_info[id].dense_prefix() != _space_info[id].space()->bottom()) { |
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1332 // The value was chosen to provoke splitting a young gen space; use it. |
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1333 return _space_info[id].dense_prefix(); |
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1334 } |
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1335 } |
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1336 |
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1337 const size_t region_size = ParallelCompactData::RegionSize; |
0 | 1338 const ParallelCompactData& sd = summary_data(); |
1339 | |
1340 const MutableSpace* const space = _space_info[id].space(); | |
1341 HeapWord* const top = space->top(); | |
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1342 HeapWord* const top_aligned_up = sd.region_align_up(top); |
0 | 1343 HeapWord* const new_top = _space_info[id].new_top(); |
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1344 HeapWord* const new_top_aligned_up = sd.region_align_up(new_top); |
0 | 1345 HeapWord* const bottom = space->bottom(); |
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1346 const RegionData* const beg_cp = sd.addr_to_region_ptr(bottom); |
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1347 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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1348 const RegionData* const new_top_cp = |
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1349 sd.addr_to_region_ptr(new_top_aligned_up); |
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1350 |
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1351 // Skip full regions at the beginning of the space--they are necessarily part |
0 | 1352 // of the dense prefix. |
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1353 const RegionData* const full_cp = first_dead_space_region(beg_cp, new_top_cp); |
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1354 assert(full_cp->destination() == sd.region_to_addr(full_cp) || |
0 | 1355 space->is_empty(), "no dead space allowed to the left"); |
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1356 assert(full_cp->data_size() < region_size || full_cp == new_top_cp - 1, |
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1357 "region must have dead space"); |
0 | 1358 |
1359 // The gc number is saved whenever a maximum compaction is done, and used to | |
1360 // determine when the maximum compaction interval has expired. This avoids | |
1361 // successive max compactions for different reasons. | |
1362 assert(total_invocations() >= _maximum_compaction_gc_num, "sanity"); | |
1363 const size_t gcs_since_max = total_invocations() - _maximum_compaction_gc_num; | |
1364 const bool interval_ended = gcs_since_max > HeapMaximumCompactionInterval || | |
1365 total_invocations() == HeapFirstMaximumCompactionCount; | |
1366 if (maximum_compaction || full_cp == top_cp || interval_ended) { | |
1367 _maximum_compaction_gc_num = total_invocations(); | |
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1368 return sd.region_to_addr(full_cp); |
0 | 1369 } |
1370 | |
1371 const size_t space_live = pointer_delta(new_top, bottom); | |
1372 const size_t space_used = space->used_in_words(); | |
1373 const size_t space_capacity = space->capacity_in_words(); | |
1374 | |
1375 const double density = double(space_live) / double(space_capacity); | |
1376 const size_t min_percent_free = | |
1377 id == perm_space_id ? PermMarkSweepDeadRatio : MarkSweepDeadRatio; | |
1378 const double limiter = dead_wood_limiter(density, min_percent_free); | |
1379 const size_t dead_wood_max = space_used - space_live; | |
1380 const size_t dead_wood_limit = MIN2(size_t(space_capacity * limiter), | |
1381 dead_wood_max); | |
1382 | |
1383 if (TraceParallelOldGCDensePrefix) { | |
1384 tty->print_cr("space_live=" SIZE_FORMAT " " "space_used=" SIZE_FORMAT " " | |
1385 "space_cap=" SIZE_FORMAT, | |
1386 space_live, space_used, | |
1387 space_capacity); | |
1388 tty->print_cr("dead_wood_limiter(%6.4f, %d)=%6.4f " | |
1389 "dead_wood_max=" SIZE_FORMAT " dead_wood_limit=" SIZE_FORMAT, | |
1390 density, min_percent_free, limiter, | |
1391 dead_wood_max, dead_wood_limit); | |
1392 } | |
1393 | |
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1394 // Locate the region with the desired amount of dead space to the left. |
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1395 const RegionData* const limit_cp = |
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1396 dead_wood_limit_region(full_cp, top_cp, dead_wood_limit); |
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1397 |
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1398 // Scan from the first region with dead space to the limit region and find the |
0 | 1399 // one with the best (largest) reclaimed ratio. |
1400 double best_ratio = 0.0; | |
375
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1401 const RegionData* best_cp = full_cp; |
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1402 for (const RegionData* cp = full_cp; cp < limit_cp; ++cp) { |
0 | 1403 double tmp_ratio = reclaimed_ratio(cp, bottom, top, new_top); |
1404 if (tmp_ratio > best_ratio) { | |
1405 best_cp = cp; | |
1406 best_ratio = tmp_ratio; | |
1407 } | |
1408 } | |
1409 | |
1410 #if 0 | |
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1411 // Something to consider: if the region with the best ratio is 'close to' the |
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1412 // first region w/free space, choose the first region with free space |
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1413 // ("first-free"). The first-free region is usually near the start of the |
0 | 1414 // heap, which means we are copying most of the heap already, so copy a bit |
1415 // more to get complete compaction. | |
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1416 if (pointer_delta(best_cp, full_cp, sizeof(RegionData)) < 4) { |
0 | 1417 _maximum_compaction_gc_num = total_invocations(); |
1418 best_cp = full_cp; | |
1419 } | |
1420 #endif // #if 0 | |
1421 | |
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1422 return sd.region_to_addr(best_cp); |
0 | 1423 } |
1424 | |
483
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1425 #ifndef PRODUCT |
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1426 void |
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1427 PSParallelCompact::fill_with_live_objects(SpaceId id, HeapWord* const start, |
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1428 size_t words) |
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1429 { |
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1430 if (TraceParallelOldGCSummaryPhase) { |
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1431 tty->print_cr("fill_with_live_objects [" PTR_FORMAT " " PTR_FORMAT ") " |
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1432 SIZE_FORMAT, start, start + words, words); |
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1433 } |
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1434 |
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1435 ObjectStartArray* const start_array = _space_info[id].start_array(); |
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1436 CollectedHeap::fill_with_objects(start, words); |
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1437 for (HeapWord* p = start; p < start + words; p += oop(p)->size()) { |
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1438 _mark_bitmap.mark_obj(p, words); |
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1439 _summary_data.add_obj(p, words); |
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1440 start_array->allocate_block(p); |
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1441 } |
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1442 } |
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1443 |
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1444 void |
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1445 PSParallelCompact::summarize_new_objects(SpaceId id, HeapWord* start) |
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1446 { |
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1447 ParallelCompactData& sd = summary_data(); |
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1448 MutableSpace* space = _space_info[id].space(); |
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1449 |
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1450 // Find the source and destination start addresses. |
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1451 HeapWord* const src_addr = sd.region_align_down(start); |
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1452 HeapWord* dst_addr; |
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1453 if (src_addr < start) { |
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1454 dst_addr = sd.addr_to_region_ptr(src_addr)->destination(); |
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1455 } else if (src_addr > space->bottom()) { |
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1456 // The start (the original top() value) is aligned to a region boundary so |
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1457 // the associated region does not have a destination. Compute the |
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1458 // destination from the previous region. |
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1459 RegionData* const cp = sd.addr_to_region_ptr(src_addr) - 1; |
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1460 dst_addr = cp->destination() + cp->data_size(); |
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1461 } else { |
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1462 // Filling the entire space. |
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1463 dst_addr = space->bottom(); |
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1464 } |
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1465 assert(dst_addr != NULL, "sanity"); |
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1466 |
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1467 // Update the summary data. |
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1468 bool result = _summary_data.summarize(_space_info[id].split_info(), |
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1469 src_addr, space->top(), NULL, |
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1470 dst_addr, space->end(), |
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1471 _space_info[id].new_top_addr()); |
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1472 assert(result, "should not fail: bad filler object size"); |
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1473 } |
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1474 |
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1475 void |
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1476 PSParallelCompact::provoke_split(bool & max_compaction) |
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1477 { |
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1478 const size_t region_size = ParallelCompactData::RegionSize; |
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1479 ParallelCompactData& sd = summary_data(); |
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1480 |
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1481 MutableSpace* const eden_space = _space_info[eden_space_id].space(); |
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1482 MutableSpace* const from_space = _space_info[from_space_id].space(); |
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1483 const size_t eden_live = pointer_delta(eden_space->top(), |
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1484 _space_info[eden_space_id].new_top()); |
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1485 const size_t from_live = pointer_delta(from_space->top(), |
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1486 _space_info[from_space_id].new_top()); |
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1487 |
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1488 const size_t min_fill_size = CollectedHeap::min_fill_size(); |
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1489 const size_t eden_free = pointer_delta(eden_space->end(), eden_space->top()); |
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1490 const size_t eden_fillable = eden_free >= min_fill_size ? eden_free : 0; |
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1491 const size_t from_free = pointer_delta(from_space->end(), from_space->top()); |
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1492 const size_t from_fillable = from_free >= min_fill_size ? from_free : 0; |
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1493 |
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1494 // Choose the space to split; need at least 2 regions live (or fillable). |
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1495 SpaceId id; |
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1496 MutableSpace* space; |
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1497 size_t live_words; |
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1498 size_t fill_words; |
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1499 if (eden_live + eden_fillable >= region_size * 2) { |
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1500 id = eden_space_id; |
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1501 space = eden_space; |
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1502 live_words = eden_live; |
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1503 fill_words = eden_fillable; |
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1504 } else if (from_live + from_fillable >= region_size * 2) { |
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1505 id = from_space_id; |
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1506 space = from_space; |
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1507 live_words = from_live; |
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1508 fill_words = from_fillable; |
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1509 } else { |
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1510 return; // Give up. |
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1511 } |
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1512 assert(fill_words == 0 || fill_words >= min_fill_size, "sanity"); |
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1513 |
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1514 if (live_words < region_size * 2) { |
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1515 // Fill from top() to end() w/live objects of mixed sizes. |
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1516 HeapWord* const fill_start = space->top(); |
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1517 live_words += fill_words; |
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1518 |
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1519 space->set_top(fill_start + fill_words); |
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1520 if (ZapUnusedHeapArea) { |
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1521 space->set_top_for_allocations(); |
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1522 } |
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1523 |
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1524 HeapWord* cur_addr = fill_start; |
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1525 while (fill_words > 0) { |
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1526 const size_t r = (size_t)os::random() % (region_size / 2) + min_fill_size; |
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1527 size_t cur_size = MIN2(align_object_size_(r), fill_words); |
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1528 if (fill_words - cur_size < min_fill_size) { |
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1529 cur_size = fill_words; // Avoid leaving a fragment too small to fill. |
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1530 } |
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1531 |
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1532 CollectedHeap::fill_with_object(cur_addr, cur_size); |
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1533 mark_bitmap()->mark_obj(cur_addr, cur_size); |
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1534 sd.add_obj(cur_addr, cur_size); |
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1535 |
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1536 cur_addr += cur_size; |
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1537 fill_words -= cur_size; |
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1538 } |
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1539 |
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1540 summarize_new_objects(id, fill_start); |
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1541 } |
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1542 |
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1543 max_compaction = false; |
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1544 |
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1545 // Manipulate the old gen so that it has room for about half of the live data |
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1546 // in the target young gen space (live_words / 2). |
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1547 id = old_space_id; |
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1548 space = _space_info[id].space(); |
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1549 const size_t free_at_end = space->free_in_words(); |
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1550 const size_t free_target = align_object_size(live_words / 2); |
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1551 const size_t dead = pointer_delta(space->top(), _space_info[id].new_top()); |
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1552 |
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1553 if (free_at_end >= free_target + min_fill_size) { |
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1554 // Fill space above top() and set the dense prefix so everything survives. |
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1555 HeapWord* const fill_start = space->top(); |
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1556 const size_t fill_size = free_at_end - free_target; |
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1557 space->set_top(space->top() + fill_size); |
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1558 if (ZapUnusedHeapArea) { |
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1559 space->set_top_for_allocations(); |
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1560 } |
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1561 fill_with_live_objects(id, fill_start, fill_size); |
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1562 summarize_new_objects(id, fill_start); |
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1563 _space_info[id].set_dense_prefix(sd.region_align_down(space->top())); |
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1564 } else if (dead + free_at_end > free_target) { |
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1565 // Find a dense prefix that makes the right amount of space available. |
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1566 HeapWord* cur = sd.region_align_down(space->top()); |
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1567 HeapWord* cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1568 size_t dead_to_right = pointer_delta(space->end(), cur_destination); |
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1569 while (dead_to_right < free_target) { |
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1570 cur -= region_size; |
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1571 cur_destination = sd.addr_to_region_ptr(cur)->destination(); |
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1572 dead_to_right = pointer_delta(space->end(), cur_destination); |
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1573 } |
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1574 _space_info[id].set_dense_prefix(cur); |
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1575 } |
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1576 } |
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1577 #endif // #ifndef PRODUCT |
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1578 |
0 | 1579 void PSParallelCompact::summarize_spaces_quick() |
1580 { | |
1581 for (unsigned int i = 0; i < last_space_id; ++i) { | |
1582 const MutableSpace* space = _space_info[i].space(); | |
482
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1583 HeapWord** nta = _space_info[i].new_top_addr(); |
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1584 bool result = _summary_data.summarize(_space_info[i].split_info(), |
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1585 space->bottom(), space->top(), NULL, |
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1586 space->bottom(), space->end(), nta); |
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1587 assert(result, "space must fit into itself"); |
0 | 1588 _space_info[i].set_dense_prefix(space->bottom()); |
1589 } | |
1590 } | |
1591 | |
1592 void PSParallelCompact::fill_dense_prefix_end(SpaceId id) | |
1593 { | |
1594 HeapWord* const dense_prefix_end = dense_prefix(id); | |
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1595 const RegionData* region = _summary_data.addr_to_region_ptr(dense_prefix_end); |
0 | 1596 const idx_t dense_prefix_bit = _mark_bitmap.addr_to_bit(dense_prefix_end); |
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1597 if (dead_space_crosses_boundary(region, dense_prefix_bit)) { |
0 | 1598 // Only enough dead space is filled so that any remaining dead space to the |
1599 // left is larger than the minimum filler object. (The remainder is filled | |
1600 // during the copy/update phase.) | |
1601 // | |
1602 // The size of the dead space to the right of the boundary is not a | |
1603 // concern, since compaction will be able to use whatever space is | |
1604 // available. | |
1605 // | |
1606 // Here '||' is the boundary, 'x' represents a don't care bit and a box | |
1607 // surrounds the space to be filled with an object. | |
1608 // | |
1609 // In the 32-bit VM, each bit represents two 32-bit words: | |
1610 // +---+ | |
1611 // a) beg_bits: ... x x x | 0 | || 0 x x ... | |
1612 // end_bits: ... x x x | 0 | || 0 x x ... | |
1613 // +---+ | |
1614 // | |
1615 // In the 64-bit VM, each bit represents one 64-bit word: | |
1616 // +------------+ | |
1617 // b) beg_bits: ... x x x | 0 || 0 | x x ... | |
1618 // end_bits: ... x x 1 | 0 || 0 | x x ... | |
1619 // +------------+ | |
1620 // +-------+ | |
1621 // c) beg_bits: ... x x | 0 0 | || 0 x x ... | |
1622 // end_bits: ... x 1 | 0 0 | || 0 x x ... | |
1623 // +-------+ | |
1624 // +-----------+ | |
1625 // d) beg_bits: ... x | 0 0 0 | || 0 x x ... | |
1626 // end_bits: ... 1 | 0 0 0 | || 0 x x ... | |
1627 // +-----------+ | |
1628 // +-------+ | |
1629 // e) beg_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1630 // end_bits: ... 0 0 | 0 0 | || 0 x x ... | |
1631 // +-------+ | |
1632 | |
1633 // Initially assume case a, c or e will apply. | |
1634 size_t obj_len = (size_t)oopDesc::header_size(); | |
1635 HeapWord* obj_beg = dense_prefix_end - obj_len; | |
1636 | |
1637 #ifdef _LP64 | |
1638 if (_mark_bitmap.is_obj_end(dense_prefix_bit - 2)) { | |
1639 // Case b above. | |
1640 obj_beg = dense_prefix_end - 1; | |
1641 } else if (!_mark_bitmap.is_obj_end(dense_prefix_bit - 3) && | |
1642 _mark_bitmap.is_obj_end(dense_prefix_bit - 4)) { | |
1643 // Case d above. | |
1644 obj_beg = dense_prefix_end - 3; | |
1645 obj_len = 3; | |
1646 } | |
1647 #endif // #ifdef _LP64 | |
1648 | |
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1649 CollectedHeap::fill_with_object(obj_beg, obj_len); |
0 | 1650 _mark_bitmap.mark_obj(obj_beg, obj_len); |
1651 _summary_data.add_obj(obj_beg, obj_len); | |
1652 assert(start_array(id) != NULL, "sanity"); | |
1653 start_array(id)->allocate_block(obj_beg); | |
1654 } | |
1655 } | |
1656 | |
1657 void | |
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1658 PSParallelCompact::clear_source_region(HeapWord* beg_addr, HeapWord* end_addr) |
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1659 { |
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1660 RegionData* const beg_ptr = _summary_data.addr_to_region_ptr(beg_addr); |
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1661 HeapWord* const end_aligned_up = _summary_data.region_align_up(end_addr); |
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1662 RegionData* const end_ptr = _summary_data.addr_to_region_ptr(end_aligned_up); |
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1663 for (RegionData* cur = beg_ptr; cur < end_ptr; ++cur) { |
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1664 cur->set_source_region(0); |
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1665 } |
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1666 } |
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1667 |
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1668 void |
0 | 1669 PSParallelCompact::summarize_space(SpaceId id, bool maximum_compaction) |
1670 { | |
1671 assert(id < last_space_id, "id out of range"); | |
483
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1672 assert(_space_info[id].dense_prefix() == _space_info[id].space()->bottom() || |
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1673 ParallelOldGCSplitALot && id == old_space_id, |
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1674 "should have been reset in summarize_spaces_quick()"); |
0 | 1675 |
1676 const MutableSpace* space = _space_info[id].space(); | |
265
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1677 if (_space_info[id].new_top() != space->bottom()) { |
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1678 HeapWord* dense_prefix_end = compute_dense_prefix(id, maximum_compaction); |
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1679 _space_info[id].set_dense_prefix(dense_prefix_end); |
0 | 1680 |
1681 #ifndef PRODUCT | |
265
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1682 if (TraceParallelOldGCDensePrefix) { |
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1683 print_dense_prefix_stats("ratio", id, maximum_compaction, |
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1684 dense_prefix_end); |
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1685 HeapWord* addr = compute_dense_prefix_via_density(id, maximum_compaction); |
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1686 print_dense_prefix_stats("density", id, maximum_compaction, addr); |
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1687 } |
0 | 1688 #endif // #ifndef PRODUCT |
1689 | |
483
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1690 // Recompute the summary data, taking into account the dense prefix. If |
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1691 // every last byte will be reclaimed, then the existing summary data which |
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1692 // compacts everything can be left in place. |
265
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1693 if (!maximum_compaction && dense_prefix_end != space->bottom()) { |
482
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1694 // If dead space crosses the dense prefix boundary, it is (at least |
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1695 // partially) filled with a dummy object, marked live and added to the |
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1696 // summary data. This simplifies the copy/update phase and must be done |
483
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1697 // before the final locations of objects are determined, to prevent |
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1698 // leaving a fragment of dead space that is too small to fill. |
265
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1699 fill_dense_prefix_end(id); |
482
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1700 |
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1701 // Compute the destination of each Region, and thus each object. |
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1702 _summary_data.summarize_dense_prefix(space->bottom(), dense_prefix_end); |
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1703 _summary_data.summarize(_space_info[id].split_info(), |
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1704 dense_prefix_end, space->top(), NULL, |
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1705 dense_prefix_end, space->end(), |
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1706 _space_info[id].new_top_addr()); |
265
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1707 } |
0 | 1708 } |
1709 | |
1710 if (TraceParallelOldGCSummaryPhase) { | |
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1711 const size_t region_size = ParallelCompactData::RegionSize; |
265
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1712 HeapWord* const dense_prefix_end = _space_info[id].dense_prefix(); |
375
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1713 const size_t dp_region = _summary_data.addr_to_region_idx(dense_prefix_end); |
0 | 1714 const size_t dp_words = pointer_delta(dense_prefix_end, space->bottom()); |
265
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1715 HeapWord* const new_top = _space_info[id].new_top(); |
375
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1716 const HeapWord* nt_aligned_up = _summary_data.region_align_up(new_top); |
0 | 1717 const size_t cr_words = pointer_delta(nt_aligned_up, dense_prefix_end); |
1718 tty->print_cr("id=%d cap=" SIZE_FORMAT " dp=" PTR_FORMAT " " | |
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1719 "dp_region=" SIZE_FORMAT " " "dp_count=" SIZE_FORMAT " " |
0 | 1720 "cr_count=" SIZE_FORMAT " " "nt=" PTR_FORMAT, |
1721 id, space->capacity_in_words(), dense_prefix_end, | |
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1722 dp_region, dp_words / region_size, |
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1723 cr_words / region_size, new_top); |
0 | 1724 } |
1725 } | |
1726 | |
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1727 #ifndef PRODUCT |
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1728 void PSParallelCompact::summary_phase_msg(SpaceId dst_space_id, |
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1729 HeapWord* dst_beg, HeapWord* dst_end, |
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1730 SpaceId src_space_id, |
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1731 HeapWord* src_beg, HeapWord* src_end) |
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1732 { |
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1733 if (TraceParallelOldGCSummaryPhase) { |
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1734 tty->print_cr("summarizing %d [%s] into %d [%s]: " |
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1735 "src=" PTR_FORMAT "-" PTR_FORMAT " " |
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1736 SIZE_FORMAT "-" SIZE_FORMAT " " |
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1737 "dst=" PTR_FORMAT "-" PTR_FORMAT " " |
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1738 SIZE_FORMAT "-" SIZE_FORMAT, |
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1739 src_space_id, space_names[src_space_id], |
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1740 dst_space_id, space_names[dst_space_id], |
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1741 src_beg, src_end, |
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1742 _summary_data.addr_to_region_idx(src_beg), |
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1743 _summary_data.addr_to_region_idx(src_end), |
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1744 dst_beg, dst_end, |
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1745 _summary_data.addr_to_region_idx(dst_beg), |
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1746 _summary_data.addr_to_region_idx(dst_end)); |
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1747 } |
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1748 } |
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1749 #endif // #ifndef PRODUCT |
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1750 |
0 | 1751 void PSParallelCompact::summary_phase(ParCompactionManager* cm, |
1752 bool maximum_compaction) | |
1753 { | |
1754 EventMark m("2 summarize"); | |
1755 TraceTime tm("summary phase", print_phases(), true, gclog_or_tty); | |
1756 // trace("2"); | |
1757 | |
1758 #ifdef ASSERT | |
1759 if (TraceParallelOldGCMarkingPhase) { | |
1760 tty->print_cr("add_obj_count=" SIZE_FORMAT " " | |
1761 "add_obj_bytes=" SIZE_FORMAT, | |
1762 add_obj_count, add_obj_size * HeapWordSize); | |
1763 tty->print_cr("mark_bitmap_count=" SIZE_FORMAT " " | |
1764 "mark_bitmap_bytes=" SIZE_FORMAT, | |
1765 mark_bitmap_count, mark_bitmap_size * HeapWordSize); | |
1766 } | |
1767 #endif // #ifdef ASSERT | |
1768 | |
1769 // Quick summarization of each space into itself, to see how much is live. | |
1770 summarize_spaces_quick(); | |
1771 | |
1772 if (TraceParallelOldGCSummaryPhase) { | |
1773 tty->print_cr("summary_phase: after summarizing each space to self"); | |
1774 Universe::print(); | |
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1775 NOT_PRODUCT(print_region_ranges()); |
0 | 1776 if (Verbose) { |
1777 NOT_PRODUCT(print_initial_summary_data(_summary_data, _space_info)); | |
1778 } | |
1779 } | |
1780 | |
1781 // The amount of live data that will end up in old space (assuming it fits). | |
1782 size_t old_space_total_live = 0; | |
482
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1783 assert(perm_space_id < old_space_id, "should not count perm data here"); |
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1784 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
0 | 1785 old_space_total_live += pointer_delta(_space_info[id].new_top(), |
1786 _space_info[id].space()->bottom()); | |
1787 } | |
1788 | |
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1789 MutableSpace* const old_space = _space_info[old_space_id].space(); |
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1790 const size_t old_capacity = old_space->capacity_in_words(); |
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1791 if (old_space_total_live > old_capacity) { |
0 | 1792 // XXX - should also try to expand |
1793 maximum_compaction = true; | |
1794 } | |
483
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1795 #ifndef PRODUCT |
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1796 if (ParallelOldGCSplitALot && old_space_total_live < old_capacity) { |
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1797 if (total_invocations() % ParallelOldGCSplitInterval == 0) { |
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1798 provoke_split(maximum_compaction); |
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1799 } |
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1800 } |
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1801 #endif // #ifndef PRODUCT |
0 | 1802 |
1803 // Permanent and Old generations. | |
1804 summarize_space(perm_space_id, maximum_compaction); | |
1805 summarize_space(old_space_id, maximum_compaction); | |
1806 | |
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1807 // Summarize the remaining spaces in the young gen. The initial target space |
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1808 // is the old gen. If a space does not fit entirely into the target, then the |
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1809 // remainder is compacted into the space itself and that space becomes the new |
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1810 // target. |
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1811 SpaceId dst_space_id = old_space_id; |
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1812 HeapWord* dst_space_end = old_space->end(); |
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1813 HeapWord** new_top_addr = _space_info[dst_space_id].new_top_addr(); |
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1814 for (unsigned int id = eden_space_id; id < last_space_id; ++id) { |
0 | 1815 const MutableSpace* space = _space_info[id].space(); |
1816 const size_t live = pointer_delta(_space_info[id].new_top(), | |
1817 space->bottom()); | |
482
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1818 const size_t available = pointer_delta(dst_space_end, *new_top_addr); |
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1819 |
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1820 NOT_PRODUCT(summary_phase_msg(dst_space_id, *new_top_addr, dst_space_end, |
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1821 SpaceId(id), space->bottom(), space->top());) |
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1822 if (live > 0 && live <= available) { |
0 | 1823 // All the live data will fit. |
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1824 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1825 space->bottom(), space->top(), |
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1826 NULL, |
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1827 *new_top_addr, dst_space_end, |
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1828 new_top_addr); |
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1829 assert(done, "space must fit into old gen"); |
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1830 |
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1831 // Reset the new_top value for the space. |
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1832 _space_info[id].set_new_top(space->bottom()); |
482
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1833 } else if (live > 0) { |
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1834 // Attempt to fit part of the source space into the target space. |
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1835 HeapWord* next_src_addr = NULL; |
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1836 bool done = _summary_data.summarize(_space_info[id].split_info(), |
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1837 space->bottom(), space->top(), |
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1838 &next_src_addr, |
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1839 *new_top_addr, dst_space_end, |
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1840 new_top_addr); |
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1841 assert(!done, "space should not fit into old gen"); |
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1842 assert(next_src_addr != NULL, "sanity"); |
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1843 |
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1844 // The source space becomes the new target, so the remainder is compacted |
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1845 // within the space itself. |
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1846 dst_space_id = SpaceId(id); |
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1847 dst_space_end = space->end(); |
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1848 new_top_addr = _space_info[id].new_top_addr(); |
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1849 NOT_PRODUCT(summary_phase_msg(dst_space_id, |
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1850 space->bottom(), dst_space_end, |
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1851 SpaceId(id), next_src_addr, space->top());) |
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1852 done = _summary_data.summarize(_space_info[id].split_info(), |
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1853 next_src_addr, space->top(), |
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1854 NULL, |
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1855 space->bottom(), dst_space_end, |
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1856 new_top_addr); |
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1857 assert(done, "space must fit when compacted into itself"); |
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1858 assert(*new_top_addr <= space->top(), "usage should not grow"); |
0 | 1859 } |
1860 } | |
1861 | |
1862 if (TraceParallelOldGCSummaryPhase) { | |
1863 tty->print_cr("summary_phase: after final summarization"); | |
1864 Universe::print(); | |
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1865 NOT_PRODUCT(print_region_ranges()); |
0 | 1866 if (Verbose) { |
1867 NOT_PRODUCT(print_generic_summary_data(_summary_data, _space_info)); | |
1868 } | |
1869 } | |
1870 } | |
1871 | |
1872 // This method should contain all heap-specific policy for invoking a full | |
1873 // collection. invoke_no_policy() will only attempt to compact the heap; it | |
1874 // will do nothing further. If we need to bail out for policy reasons, scavenge | |
1875 // before full gc, or any other specialized behavior, it needs to be added here. | |
1876 // | |
1877 // Note that this method should only be called from the vm_thread while at a | |
1878 // safepoint. | |
1879 void PSParallelCompact::invoke(bool maximum_heap_compaction) { | |
1880 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
1881 assert(Thread::current() == (Thread*)VMThread::vm_thread(), | |
1882 "should be in vm thread"); | |
1883 ParallelScavengeHeap* heap = gc_heap(); | |
1884 GCCause::Cause gc_cause = heap->gc_cause(); | |
1885 assert(!heap->is_gc_active(), "not reentrant"); | |
1886 | |
1887 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
1888 | |
1889 // Before each allocation/collection attempt, find out from the | |
1890 // policy object if GCs are, on the whole, taking too long. If so, | |
1891 // bail out without attempting a collection. The exceptions are | |
1892 // for explicitly requested GC's. | |
1893 if (!policy->gc_time_limit_exceeded() || | |
1894 GCCause::is_user_requested_gc(gc_cause) || | |
1895 GCCause::is_serviceability_requested_gc(gc_cause)) { | |
1896 IsGCActiveMark mark; | |
1897 | |
1898 if (ScavengeBeforeFullGC) { | |
1899 PSScavenge::invoke_no_policy(); | |
1900 } | |
1901 | |
1902 PSParallelCompact::invoke_no_policy(maximum_heap_compaction); | |
1903 } | |
1904 } | |
1905 | |
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1906 bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) { |
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1907 size_t addr_region_index = addr_to_region_idx(addr); |
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1908 return region_index == addr_region_index; |
0 | 1909 } |
1910 | |
1911 // This method contains no policy. You should probably | |
1912 // be calling invoke() instead. | |
1913 void PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) { | |
1914 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
1915 assert(ref_processor() != NULL, "Sanity"); | |
1916 | |
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1917 if (GC_locker::check_active_before_gc()) { |
0 | 1918 return; |
1919 } | |
1920 | |
1921 TimeStamp marking_start; | |
1922 TimeStamp compaction_start; | |
1923 TimeStamp collection_exit; | |
1924 | |
1925 ParallelScavengeHeap* heap = gc_heap(); | |
1926 GCCause::Cause gc_cause = heap->gc_cause(); | |
1927 PSYoungGen* young_gen = heap->young_gen(); | |
1928 PSOldGen* old_gen = heap->old_gen(); | |
1929 PSPermGen* perm_gen = heap->perm_gen(); | |
1930 PSAdaptiveSizePolicy* size_policy = heap->size_policy(); | |
1931 | |
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1932 if (ZapUnusedHeapArea) { |
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1933 // Save information needed to minimize mangling |
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1934 heap->record_gen_tops_before_GC(); |
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1935 } |
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1936 |
0 | 1937 _print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes; |
1938 | |
1939 // Make sure data structures are sane, make the heap parsable, and do other | |
1940 // miscellaneous bookkeeping. | |
1941 PreGCValues pre_gc_values; | |
1942 pre_compact(&pre_gc_values); | |
1943 | |
210 | 1944 // Get the compaction manager reserved for the VM thread. |
1945 ParCompactionManager* const vmthread_cm = | |
1946 ParCompactionManager::manager_array(gc_task_manager()->workers()); | |
1947 | |
0 | 1948 // Place after pre_compact() where the number of invocations is incremented. |
1949 AdaptiveSizePolicyOutput(size_policy, heap->total_collections()); | |
1950 | |
1951 { | |
1952 ResourceMark rm; | |
1953 HandleMark hm; | |
1954 | |
1955 const bool is_system_gc = gc_cause == GCCause::_java_lang_system_gc; | |
1956 | |
1957 // This is useful for debugging but don't change the output the | |
1958 // the customer sees. | |
1959 const char* gc_cause_str = "Full GC"; | |
1960 if (is_system_gc && PrintGCDetails) { | |
1961 gc_cause_str = "Full GC (System)"; | |
1962 } | |
1963 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
1964 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
1965 TraceTime t1(gc_cause_str, PrintGC, !PrintGCDetails, gclog_or_tty); | |
1966 TraceCollectorStats tcs(counters()); | |
1967 TraceMemoryManagerStats tms(true /* Full GC */); | |
1968 | |
1969 if (TraceGen1Time) accumulated_time()->start(); | |
1970 | |
1971 // Let the size policy know we're starting | |
1972 size_policy->major_collection_begin(); | |
1973 | |
1974 // When collecting the permanent generation methodOops may be moving, | |
1975 // so we either have to flush all bcp data or convert it into bci. | |
1976 CodeCache::gc_prologue(); | |
1977 Threads::gc_prologue(); | |
1978 | |
1979 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
1980 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1981 | |
1982 ref_processor()->enable_discovery(); | |
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1983 ref_processor()->setup_policy(maximum_heap_compaction); |
0 | 1984 |
1985 bool marked_for_unloading = false; | |
1986 | |
1987 marking_start.update(); | |
210 | 1988 marking_phase(vmthread_cm, maximum_heap_compaction); |
0 | 1989 |
1990 #ifndef PRODUCT | |
1991 if (TraceParallelOldGCMarkingPhase) { | |
1992 gclog_or_tty->print_cr("marking_phase: cas_tries %d cas_retries %d " | |
1993 "cas_by_another %d", | |
1994 mark_bitmap()->cas_tries(), mark_bitmap()->cas_retries(), | |
1995 mark_bitmap()->cas_by_another()); | |
1996 } | |
1997 #endif // #ifndef PRODUCT | |
1998 | |
1999 bool max_on_system_gc = UseMaximumCompactionOnSystemGC && is_system_gc; | |
210 | 2000 summary_phase(vmthread_cm, maximum_heap_compaction || max_on_system_gc); |
0 | 2001 |
2002 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
2003 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
2004 | |
2005 // adjust_roots() updates Universe::_intArrayKlassObj which is | |
2006 // needed by the compaction for filling holes in the dense prefix. | |
2007 adjust_roots(); | |
2008 | |
2009 compaction_start.update(); | |
2010 // Does the perm gen always have to be done serially because | |
2011 // klasses are used in the update of an object? | |
210 | 2012 compact_perm(vmthread_cm); |
0 | 2013 |
2014 if (UseParallelOldGCCompacting) { | |
2015 compact(); | |
2016 } else { | |
210 | 2017 compact_serial(vmthread_cm); |
0 | 2018 } |
2019 | |
2020 // Reset the mark bitmap, summary data, and do other bookkeeping. Must be | |
2021 // done before resizing. | |
2022 post_compact(); | |
2023 | |
2024 // Let the size policy know we're done | |
2025 size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause); | |
2026 | |
2027 if (UseAdaptiveSizePolicy) { | |
2028 if (PrintAdaptiveSizePolicy) { | |
2029 gclog_or_tty->print("AdaptiveSizeStart: "); | |
2030 gclog_or_tty->stamp(); | |
2031 gclog_or_tty->print_cr(" collection: %d ", | |
2032 heap->total_collections()); | |
2033 if (Verbose) { | |
2034 gclog_or_tty->print("old_gen_capacity: %d young_gen_capacity: %d" | |
2035 " perm_gen_capacity: %d ", | |
2036 old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes(), | |
2037 perm_gen->capacity_in_bytes()); | |
2038 } | |
2039 } | |
2040 | |
2041 // Don't check if the size_policy is ready here. Let | |
2042 // the size_policy check that internally. | |
2043 if (UseAdaptiveGenerationSizePolicyAtMajorCollection && | |
2044 ((gc_cause != GCCause::_java_lang_system_gc) || | |
2045 UseAdaptiveSizePolicyWithSystemGC)) { | |
2046 // Calculate optimal free space amounts | |
2047 assert(young_gen->max_size() > | |
2048 young_gen->from_space()->capacity_in_bytes() + | |
2049 young_gen->to_space()->capacity_in_bytes(), | |
2050 "Sizes of space in young gen are out-of-bounds"); | |
2051 size_t max_eden_size = young_gen->max_size() - | |
2052 young_gen->from_space()->capacity_in_bytes() - | |
2053 young_gen->to_space()->capacity_in_bytes(); | |
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2054 size_policy->compute_generation_free_space( |
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2055 young_gen->used_in_bytes(), |
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2056 young_gen->eden_space()->used_in_bytes(), |
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2057 old_gen->used_in_bytes(), |
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2058 perm_gen->used_in_bytes(), |
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2059 young_gen->eden_space()->capacity_in_bytes(), |
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2060 old_gen->max_gen_size(), |
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2061 max_eden_size, |
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2062 true /* full gc*/, |
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2063 gc_cause); |
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2064 |
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2065 heap->resize_old_gen( |
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2066 size_policy->calculated_old_free_size_in_bytes()); |
0 | 2067 |
2068 // Don't resize the young generation at an major collection. A | |
2069 // desired young generation size may have been calculated but | |
2070 // resizing the young generation complicates the code because the | |
2071 // resizing of the old generation may have moved the boundary | |
2072 // between the young generation and the old generation. Let the | |
2073 // young generation resizing happen at the minor collections. | |
2074 } | |
2075 if (PrintAdaptiveSizePolicy) { | |
2076 gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ", | |
2077 heap->total_collections()); | |
2078 } | |
2079 } | |
2080 | |
2081 if (UsePerfData) { | |
2082 PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters(); | |
2083 counters->update_counters(); | |
2084 counters->update_old_capacity(old_gen->capacity_in_bytes()); | |
2085 counters->update_young_capacity(young_gen->capacity_in_bytes()); | |
2086 } | |
2087 | |
2088 heap->resize_all_tlabs(); | |
2089 | |
2090 // We collected the perm gen, so we'll resize it here. | |
2091 perm_gen->compute_new_size(pre_gc_values.perm_gen_used()); | |
2092 | |
2093 if (TraceGen1Time) accumulated_time()->stop(); | |
2094 | |
2095 if (PrintGC) { | |
2096 if (PrintGCDetails) { | |
2097 // No GC timestamp here. This is after GC so it would be confusing. | |
2098 young_gen->print_used_change(pre_gc_values.young_gen_used()); | |
2099 old_gen->print_used_change(pre_gc_values.old_gen_used()); | |
2100 heap->print_heap_change(pre_gc_values.heap_used()); | |
2101 // Print perm gen last (print_heap_change() excludes the perm gen). | |
2102 perm_gen->print_used_change(pre_gc_values.perm_gen_used()); | |
2103 } else { | |
2104 heap->print_heap_change(pre_gc_values.heap_used()); | |
2105 } | |
2106 } | |
2107 | |
2108 // Track memory usage and detect low memory | |
2109 MemoryService::track_memory_usage(); | |
2110 heap->update_counters(); | |
2111 | |
2112 if (PrintGCDetails) { | |
2113 if (size_policy->print_gc_time_limit_would_be_exceeded()) { | |
2114 if (size_policy->gc_time_limit_exceeded()) { | |
2115 gclog_or_tty->print_cr(" GC time is exceeding GCTimeLimit " | |
2116 "of %d%%", GCTimeLimit); | |
2117 } else { | |
2118 gclog_or_tty->print_cr(" GC time would exceed GCTimeLimit " | |
2119 "of %d%%", GCTimeLimit); | |
2120 } | |
2121 } | |
2122 size_policy->set_print_gc_time_limit_would_be_exceeded(false); | |
2123 } | |
2124 } | |
2125 | |
2126 if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) { | |
2127 HandleMark hm; // Discard invalid handles created during verification | |
2128 gclog_or_tty->print(" VerifyAfterGC:"); | |
2129 Universe::verify(false); | |
2130 } | |
2131 | |
2132 // Re-verify object start arrays | |
2133 if (VerifyObjectStartArray && | |
2134 VerifyAfterGC) { | |
2135 old_gen->verify_object_start_array(); | |
2136 perm_gen->verify_object_start_array(); | |
2137 } | |
2138 | |
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2139 if (ZapUnusedHeapArea) { |
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2140 old_gen->object_space()->check_mangled_unused_area_complete(); |
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2141 perm_gen->object_space()->check_mangled_unused_area_complete(); |
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2142 } |
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2143 |
0 | 2144 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); |
2145 | |
2146 collection_exit.update(); | |
2147 | |
2148 if (PrintHeapAtGC) { | |
2149 Universe::print_heap_after_gc(); | |
2150 } | |
2151 if (PrintGCTaskTimeStamps) { | |
2152 gclog_or_tty->print_cr("VM-Thread " INT64_FORMAT " " INT64_FORMAT " " | |
2153 INT64_FORMAT, | |
2154 marking_start.ticks(), compaction_start.ticks(), | |
2155 collection_exit.ticks()); | |
2156 gc_task_manager()->print_task_time_stamps(); | |
2157 } | |
2158 } | |
2159 | |
2160 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, | |
2161 PSYoungGen* young_gen, | |
2162 PSOldGen* old_gen) { | |
2163 MutableSpace* const eden_space = young_gen->eden_space(); | |
2164 assert(!eden_space->is_empty(), "eden must be non-empty"); | |
2165 assert(young_gen->virtual_space()->alignment() == | |
2166 old_gen->virtual_space()->alignment(), "alignments do not match"); | |
2167 | |
2168 if (!(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary)) { | |
2169 return false; | |
2170 } | |
2171 | |
2172 // Both generations must be completely committed. | |
2173 if (young_gen->virtual_space()->uncommitted_size() != 0) { | |
2174 return false; | |
2175 } | |
2176 if (old_gen->virtual_space()->uncommitted_size() != 0) { | |
2177 return false; | |
2178 } | |
2179 | |
2180 // Figure out how much to take from eden. Include the average amount promoted | |
2181 // in the total; otherwise the next young gen GC will simply bail out to a | |
2182 // full GC. | |
2183 const size_t alignment = old_gen->virtual_space()->alignment(); | |
2184 const size_t eden_used = eden_space->used_in_bytes(); | |
2185 const size_t promoted = (size_t)size_policy->avg_promoted()->padded_average(); | |
2186 const size_t absorb_size = align_size_up(eden_used + promoted, alignment); | |
2187 const size_t eden_capacity = eden_space->capacity_in_bytes(); | |
2188 | |
2189 if (absorb_size >= eden_capacity) { | |
2190 return false; // Must leave some space in eden. | |
2191 } | |
2192 | |
2193 const size_t new_young_size = young_gen->capacity_in_bytes() - absorb_size; | |
2194 if (new_young_size < young_gen->min_gen_size()) { | |
2195 return false; // Respect young gen minimum size. | |
2196 } | |
2197 | |
2198 if (TraceAdaptiveGCBoundary && Verbose) { | |
2199 gclog_or_tty->print(" absorbing " SIZE_FORMAT "K: " | |
2200 "eden " SIZE_FORMAT "K->" SIZE_FORMAT "K " | |
2201 "from " SIZE_FORMAT "K, to " SIZE_FORMAT "K " | |
2202 "young_gen " SIZE_FORMAT "K->" SIZE_FORMAT "K ", | |
2203 absorb_size / K, | |
2204 eden_capacity / K, (eden_capacity - absorb_size) / K, | |
2205 young_gen->from_space()->used_in_bytes() / K, | |
2206 young_gen->to_space()->used_in_bytes() / K, | |
2207 young_gen->capacity_in_bytes() / K, new_young_size / K); | |
2208 } | |
2209 | |
2210 // Fill the unused part of the old gen. | |
2211 MutableSpace* const old_space = old_gen->object_space(); | |
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2212 HeapWord* const unused_start = old_space->top(); |
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2213 size_t const unused_words = pointer_delta(old_space->end(), unused_start); |
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2214 |
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2215 if (unused_words > 0) { |
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2216 if (unused_words < CollectedHeap::min_fill_size()) { |
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2217 return false; // If the old gen cannot be filled, must give up. |
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2218 } |
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2219 CollectedHeap::fill_with_objects(unused_start, unused_words); |
0 | 2220 } |
2221 | |
2222 // Take the live data from eden and set both top and end in the old gen to | |
2223 // eden top. (Need to set end because reset_after_change() mangles the region | |
2224 // from end to virtual_space->high() in debug builds). | |
2225 HeapWord* const new_top = eden_space->top(); | |
2226 old_gen->virtual_space()->expand_into(young_gen->virtual_space(), | |
2227 absorb_size); | |
2228 young_gen->reset_after_change(); | |
2229 old_space->set_top(new_top); | |
2230 old_space->set_end(new_top); | |
2231 old_gen->reset_after_change(); | |
2232 | |
2233 // Update the object start array for the filler object and the data from eden. | |
2234 ObjectStartArray* const start_array = old_gen->start_array(); | |
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2235 for (HeapWord* p = unused_start; p < new_top; p += oop(p)->size()) { |
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2236 start_array->allocate_block(p); |
0 | 2237 } |
2238 | |
2239 // Could update the promoted average here, but it is not typically updated at | |
2240 // full GCs and the value to use is unclear. Something like | |
2241 // | |
2242 // cur_promoted_avg + absorb_size / number_of_scavenges_since_last_full_gc. | |
2243 | |
2244 size_policy->set_bytes_absorbed_from_eden(absorb_size); | |
2245 return true; | |
2246 } | |
2247 | |
2248 GCTaskManager* const PSParallelCompact::gc_task_manager() { | |
2249 assert(ParallelScavengeHeap::gc_task_manager() != NULL, | |
2250 "shouldn't return NULL"); | |
2251 return ParallelScavengeHeap::gc_task_manager(); | |
2252 } | |
2253 | |
2254 void PSParallelCompact::marking_phase(ParCompactionManager* cm, | |
2255 bool maximum_heap_compaction) { | |
2256 // Recursively traverse all live objects and mark them | |
2257 EventMark m("1 mark object"); | |
2258 TraceTime tm("marking phase", print_phases(), true, gclog_or_tty); | |
2259 | |
2260 ParallelScavengeHeap* heap = gc_heap(); | |
2261 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2262 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
0 | 2263 ParallelTaskTerminator terminator(parallel_gc_threads, qset); |
2264 | |
2265 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); | |
2266 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); | |
2267 | |
2268 { | |
2269 TraceTime tm_m("par mark", print_phases(), true, gclog_or_tty); | |
2270 | |
2271 GCTaskQueue* q = GCTaskQueue::create(); | |
2272 | |
2273 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::universe)); | |
2274 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jni_handles)); | |
2275 // We scan the thread roots in parallel | |
2276 Threads::create_thread_roots_marking_tasks(q); | |
2277 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::object_synchronizer)); | |
2278 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::flat_profiler)); | |
2279 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::management)); | |
2280 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::system_dictionary)); | |
2281 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::jvmti)); | |
2282 q->enqueue(new MarkFromRootsTask(MarkFromRootsTask::vm_symbols)); | |
2283 | |
2284 if (parallel_gc_threads > 1) { | |
2285 for (uint j = 0; j < parallel_gc_threads; j++) { | |
2286 q->enqueue(new StealMarkingTask(&terminator)); | |
2287 } | |
2288 } | |
2289 | |
2290 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
2291 q->enqueue(fin); | |
2292 | |
2293 gc_task_manager()->add_list(q); | |
2294 | |
2295 fin->wait_for(); | |
2296 | |
2297 // We have to release the barrier tasks! | |
2298 WaitForBarrierGCTask::destroy(fin); | |
2299 } | |
2300 | |
2301 // Process reference objects found during marking | |
2302 { | |
2303 TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty); | |
2304 if (ref_processor()->processing_is_mt()) { | |
2305 RefProcTaskExecutor task_executor; | |
2306 ref_processor()->process_discovered_references( | |
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2307 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, |
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2308 &task_executor); |
0 | 2309 } else { |
2310 ref_processor()->process_discovered_references( | |
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2311 is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL); |
0 | 2312 } |
2313 } | |
2314 | |
2315 TraceTime tm_c("class unloading", print_phases(), true, gclog_or_tty); | |
2316 // Follow system dictionary roots and unload classes. | |
2317 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); | |
2318 | |
2319 // Follow code cache roots. | |
2320 CodeCache::do_unloading(is_alive_closure(), &mark_and_push_closure, | |
2321 purged_class); | |
2322 follow_stack(cm); // Flush marking stack. | |
2323 | |
2324 // Update subklass/sibling/implementor links of live klasses | |
2325 // revisit_klass_stack is used in follow_weak_klass_links(). | |
2326 follow_weak_klass_links(cm); | |
2327 | |
2328 // Visit symbol and interned string tables and delete unmarked oops | |
2329 SymbolTable::unlink(is_alive_closure()); | |
2330 StringTable::unlink(is_alive_closure()); | |
2331 | |
2332 assert(cm->marking_stack()->size() == 0, "stack should be empty by now"); | |
2333 assert(cm->overflow_stack()->is_empty(), "stack should be empty by now"); | |
2334 } | |
2335 | |
2336 // This should be moved to the shared markSweep code! | |
2337 class PSAlwaysTrueClosure: public BoolObjectClosure { | |
2338 public: | |
2339 void do_object(oop p) { ShouldNotReachHere(); } | |
2340 bool do_object_b(oop p) { return true; } | |
2341 }; | |
2342 static PSAlwaysTrueClosure always_true; | |
2343 | |
2344 void PSParallelCompact::adjust_roots() { | |
2345 // Adjust the pointers to reflect the new locations | |
2346 EventMark m("3 adjust roots"); | |
2347 TraceTime tm("adjust roots", print_phases(), true, gclog_or_tty); | |
2348 | |
2349 // General strong roots. | |
2350 Universe::oops_do(adjust_root_pointer_closure()); | |
2351 ReferenceProcessor::oops_do(adjust_root_pointer_closure()); | |
2352 JNIHandles::oops_do(adjust_root_pointer_closure()); // Global (strong) JNI handles | |
2353 Threads::oops_do(adjust_root_pointer_closure()); | |
2354 ObjectSynchronizer::oops_do(adjust_root_pointer_closure()); | |
2355 FlatProfiler::oops_do(adjust_root_pointer_closure()); | |
2356 Management::oops_do(adjust_root_pointer_closure()); | |
2357 JvmtiExport::oops_do(adjust_root_pointer_closure()); | |
2358 // SO_AllClasses | |
2359 SystemDictionary::oops_do(adjust_root_pointer_closure()); | |
2360 vmSymbols::oops_do(adjust_root_pointer_closure()); | |
2361 | |
2362 // Now adjust pointers in remaining weak roots. (All of which should | |
2363 // have been cleared if they pointed to non-surviving objects.) | |
2364 // Global (weak) JNI handles | |
2365 JNIHandles::weak_oops_do(&always_true, adjust_root_pointer_closure()); | |
2366 | |
2367 CodeCache::oops_do(adjust_pointer_closure()); | |
2368 SymbolTable::oops_do(adjust_root_pointer_closure()); | |
2369 StringTable::oops_do(adjust_root_pointer_closure()); | |
2370 ref_processor()->weak_oops_do(adjust_root_pointer_closure()); | |
2371 // Roots were visited so references into the young gen in roots | |
2372 // may have been scanned. Process them also. | |
2373 // Should the reference processor have a span that excludes | |
2374 // young gen objects? | |
2375 PSScavenge::reference_processor()->weak_oops_do( | |
2376 adjust_root_pointer_closure()); | |
2377 } | |
2378 | |
2379 void PSParallelCompact::compact_perm(ParCompactionManager* cm) { | |
2380 EventMark m("4 compact perm"); | |
2381 TraceTime tm("compact perm gen", print_phases(), true, gclog_or_tty); | |
2382 // trace("4"); | |
2383 | |
2384 gc_heap()->perm_gen()->start_array()->reset(); | |
2385 move_and_update(cm, perm_space_id); | |
2386 } | |
2387 | |
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2388 void PSParallelCompact::enqueue_region_draining_tasks(GCTaskQueue* q, |
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2389 uint parallel_gc_threads) |
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2390 { |
0 | 2391 TraceTime tm("drain task setup", print_phases(), true, gclog_or_tty); |
2392 | |
2393 const unsigned int task_count = MAX2(parallel_gc_threads, 1U); | |
2394 for (unsigned int j = 0; j < task_count; j++) { | |
2395 q->enqueue(new DrainStacksCompactionTask()); | |
2396 } | |
2397 | |
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2398 // Find all regions that are available (can be filled immediately) and |
0 | 2399 // distribute them to the thread stacks. The iteration is done in reverse |
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2400 // order (high to low) so the regions will be removed in ascending order. |
0 | 2401 |
2402 const ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2403 | |
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2404 size_t fillable_regions = 0; // A count for diagnostic purposes. |
0 | 2405 unsigned int which = 0; // The worker thread number. |
2406 | |
2407 for (unsigned int id = to_space_id; id > perm_space_id; --id) { | |
2408 SpaceInfo* const space_info = _space_info + id; | |
2409 MutableSpace* const space = space_info->space(); | |
2410 HeapWord* const new_top = space_info->new_top(); | |
2411 | |
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2412 const size_t beg_region = sd.addr_to_region_idx(space_info->dense_prefix()); |
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2413 const size_t end_region = |
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2414 sd.addr_to_region_idx(sd.region_align_up(new_top)); |
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2415 assert(end_region > 0, "perm gen cannot be empty"); |
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2416 |
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2417 for (size_t cur = end_region - 1; cur >= beg_region; --cur) { |
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2418 if (sd.region(cur)->claim_unsafe()) { |
0 | 2419 ParCompactionManager* cm = ParCompactionManager::manager_array(which); |
2420 cm->save_for_processing(cur); | |
2421 | |
2422 if (TraceParallelOldGCCompactionPhase && Verbose) { | |
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2423 const size_t count_mod_8 = fillable_regions & 7; |
0 | 2424 if (count_mod_8 == 0) gclog_or_tty->print("fillable: "); |
264
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2425 gclog_or_tty->print(" " SIZE_FORMAT_W(7), cur); |
0 | 2426 if (count_mod_8 == 7) gclog_or_tty->cr(); |
2427 } | |
2428 | |
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2429 NOT_PRODUCT(++fillable_regions;) |
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2430 |
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2431 // Assign regions to threads in round-robin fashion. |
0 | 2432 if (++which == task_count) { |
2433 which = 0; | |
2434 } | |
2435 } | |
2436 } | |
2437 } | |
2438 | |
2439 if (TraceParallelOldGCCompactionPhase) { | |
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2440 if (Verbose && (fillable_regions & 7) != 0) gclog_or_tty->cr(); |
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2441 gclog_or_tty->print_cr("%u initially fillable regions", fillable_regions); |
0 | 2442 } |
2443 } | |
2444 | |
2445 #define PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING 4 | |
2446 | |
2447 void PSParallelCompact::enqueue_dense_prefix_tasks(GCTaskQueue* q, | |
2448 uint parallel_gc_threads) { | |
2449 TraceTime tm("dense prefix task setup", print_phases(), true, gclog_or_tty); | |
2450 | |
2451 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
2452 | |
2453 // Iterate over all the spaces adding tasks for updating | |
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2454 // regions in the dense prefix. Assume that 1 gc thread |
0 | 2455 // will work on opening the gaps and the remaining gc threads |
2456 // will work on the dense prefix. | |
482
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2457 unsigned int space_id; |
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2458 for (space_id = old_space_id; space_id < last_space_id; ++ space_id) { |
0 | 2459 HeapWord* const dense_prefix_end = _space_info[space_id].dense_prefix(); |
2460 const MutableSpace* const space = _space_info[space_id].space(); | |
2461 | |
2462 if (dense_prefix_end == space->bottom()) { | |
2463 // There is no dense prefix for this space. | |
2464 continue; | |
2465 } | |
2466 | |
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2467 // The dense prefix is before this region. |
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2468 size_t region_index_end_dense_prefix = |
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2469 sd.addr_to_region_idx(dense_prefix_end); |
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2470 RegionData* const dense_prefix_cp = |
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2471 sd.region(region_index_end_dense_prefix); |
0 | 2472 assert(dense_prefix_end == space->end() || |
2473 dense_prefix_cp->available() || | |
2474 dense_prefix_cp->claimed(), | |
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2475 "The region after the dense prefix should always be ready to fill"); |
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2476 |
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2477 size_t region_index_start = sd.addr_to_region_idx(space->bottom()); |
0 | 2478 |
2479 // Is there dense prefix work? | |
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2480 size_t total_dense_prefix_regions = |
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2481 region_index_end_dense_prefix - region_index_start; |
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2482 // How many regions of the dense prefix should be given to |
0 | 2483 // each thread? |
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2484 if (total_dense_prefix_regions > 0) { |
0 | 2485 uint tasks_for_dense_prefix = 1; |
2486 if (UseParallelDensePrefixUpdate) { | |
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2487 if (total_dense_prefix_regions <= |
0 | 2488 (parallel_gc_threads * PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING)) { |
2489 // Don't over partition. This assumes that | |
2490 // PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING is a small integer value | |
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2491 // so there are not many regions to process. |
0 | 2492 tasks_for_dense_prefix = parallel_gc_threads; |
2493 } else { | |
2494 // Over partition | |
2495 tasks_for_dense_prefix = parallel_gc_threads * | |
2496 PAR_OLD_DENSE_PREFIX_OVER_PARTITIONING; | |
2497 } | |
2498 } | |
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2499 size_t regions_per_thread = total_dense_prefix_regions / |
0 | 2500 tasks_for_dense_prefix; |
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2501 // Give each thread at least 1 region. |
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2502 if (regions_per_thread == 0) { |
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2503 regions_per_thread = 1; |
0 | 2504 } |
2505 | |
2506 for (uint k = 0; k < tasks_for_dense_prefix; k++) { | |
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2507 if (region_index_start >= region_index_end_dense_prefix) { |
0 | 2508 break; |
2509 } | |
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2510 // region_index_end is not processed |
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2511 size_t region_index_end = MIN2(region_index_start + regions_per_thread, |
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2512 region_index_end_dense_prefix); |
482
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2513 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2514 region_index_start, |
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2515 region_index_end)); |
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2516 region_index_start = region_index_end; |
0 | 2517 } |
2518 } | |
2519 // This gets any part of the dense prefix that did not | |
2520 // fit evenly. | |
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2521 if (region_index_start < region_index_end_dense_prefix) { |
482
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2522 q->enqueue(new UpdateDensePrefixTask(SpaceId(space_id), |
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2523 region_index_start, |
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2524 region_index_end_dense_prefix)); |
0 | 2525 } |
482
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2526 } |
0 | 2527 } |
2528 | |
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2529 void PSParallelCompact::enqueue_region_stealing_tasks( |
0 | 2530 GCTaskQueue* q, |
2531 ParallelTaskTerminator* terminator_ptr, | |
2532 uint parallel_gc_threads) { | |
2533 TraceTime tm("steal task setup", print_phases(), true, gclog_or_tty); | |
2534 | |
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2535 // Once a thread has drained it's stack, it should try to steal regions from |
0 | 2536 // other threads. |
2537 if (parallel_gc_threads > 1) { | |
2538 for (uint j = 0; j < parallel_gc_threads; j++) { | |
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2539 q->enqueue(new StealRegionCompactionTask(terminator_ptr)); |
0 | 2540 } |
2541 } | |
2542 } | |
2543 | |
2544 void PSParallelCompact::compact() { | |
2545 EventMark m("5 compact"); | |
2546 // trace("5"); | |
2547 TraceTime tm("compaction phase", print_phases(), true, gclog_or_tty); | |
2548 | |
2549 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2550 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2551 PSOldGen* old_gen = heap->old_gen(); | |
2552 old_gen->start_array()->reset(); | |
2553 uint parallel_gc_threads = heap->gc_task_manager()->workers(); | |
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2554 TaskQueueSetSuper* qset = ParCompactionManager::region_array(); |
0 | 2555 ParallelTaskTerminator terminator(parallel_gc_threads, qset); |
2556 | |
2557 GCTaskQueue* q = GCTaskQueue::create(); | |
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2558 enqueue_region_draining_tasks(q, parallel_gc_threads); |
0 | 2559 enqueue_dense_prefix_tasks(q, parallel_gc_threads); |
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2560 enqueue_region_stealing_tasks(q, &terminator, parallel_gc_threads); |
0 | 2561 |
2562 { | |
2563 TraceTime tm_pc("par compact", print_phases(), true, gclog_or_tty); | |
2564 | |
2565 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
2566 q->enqueue(fin); | |
2567 | |
2568 gc_task_manager()->add_list(q); | |
2569 | |
2570 fin->wait_for(); | |
2571 | |
2572 // We have to release the barrier tasks! | |
2573 WaitForBarrierGCTask::destroy(fin); | |
2574 | |
2575 #ifdef ASSERT | |
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2576 // Verify that all regions have been processed before the deferred updates. |
0 | 2577 // Note that perm_space_id is skipped; this type of verification is not |
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2578 // valid until the perm gen is compacted by regions. |
0 | 2579 for (unsigned int id = old_space_id; id < last_space_id; ++id) { |
2580 verify_complete(SpaceId(id)); | |
2581 } | |
2582 #endif | |
2583 } | |
2584 | |
2585 { | |
2586 // Update the deferred objects, if any. Any compaction manager can be used. | |
2587 TraceTime tm_du("deferred updates", print_phases(), true, gclog_or_tty); | |
2588 ParCompactionManager* cm = ParCompactionManager::manager_array(0); | |
2589 for (unsigned int id = old_space_id; id < last_space_id; ++id) { | |
2590 update_deferred_objects(cm, SpaceId(id)); | |
2591 } | |
2592 } | |
2593 } | |
2594 | |
2595 #ifdef ASSERT | |
2596 void PSParallelCompact::verify_complete(SpaceId space_id) { | |
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2597 // All Regions between space bottom() to new_top() should be marked as filled |
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2598 // and all Regions between new_top() and top() should be available (i.e., |
0 | 2599 // should have been emptied). |
2600 ParallelCompactData& sd = summary_data(); | |
2601 SpaceInfo si = _space_info[space_id]; | |
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2602 HeapWord* new_top_addr = sd.region_align_up(si.new_top()); |
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2603 HeapWord* old_top_addr = sd.region_align_up(si.space()->top()); |
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2604 const size_t beg_region = sd.addr_to_region_idx(si.space()->bottom()); |
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2605 const size_t new_top_region = sd.addr_to_region_idx(new_top_addr); |
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2606 const size_t old_top_region = sd.addr_to_region_idx(old_top_addr); |
0 | 2607 |
2608 bool issued_a_warning = false; | |
2609 | |
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2610 size_t cur_region; |
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2611 for (cur_region = beg_region; cur_region < new_top_region; ++cur_region) { |
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2612 const RegionData* const c = sd.region(cur_region); |
0 | 2613 if (!c->completed()) { |
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2614 warning("region " SIZE_FORMAT " not filled: " |
0 | 2615 "destination_count=" SIZE_FORMAT, |
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2616 cur_region, c->destination_count()); |
0 | 2617 issued_a_warning = true; |
2618 } | |
2619 } | |
2620 | |
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2621 for (cur_region = new_top_region; cur_region < old_top_region; ++cur_region) { |
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2622 const RegionData* const c = sd.region(cur_region); |
0 | 2623 if (!c->available()) { |
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2624 warning("region " SIZE_FORMAT " not empty: " |
0 | 2625 "destination_count=" SIZE_FORMAT, |
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2626 cur_region, c->destination_count()); |
0 | 2627 issued_a_warning = true; |
2628 } | |
2629 } | |
2630 | |
2631 if (issued_a_warning) { | |
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2632 print_region_ranges(); |
0 | 2633 } |
2634 } | |
2635 #endif // #ifdef ASSERT | |
2636 | |
2637 void PSParallelCompact::compact_serial(ParCompactionManager* cm) { | |
2638 EventMark m("5 compact serial"); | |
2639 TraceTime tm("compact serial", print_phases(), true, gclog_or_tty); | |
2640 | |
2641 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
2642 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
2643 | |
2644 PSYoungGen* young_gen = heap->young_gen(); | |
2645 PSOldGen* old_gen = heap->old_gen(); | |
2646 | |
2647 old_gen->start_array()->reset(); | |
2648 old_gen->move_and_update(cm); | |
2649 young_gen->move_and_update(cm); | |
2650 } | |
2651 | |
2652 | |
2653 void PSParallelCompact::follow_stack(ParCompactionManager* cm) { | |
2654 while(!cm->overflow_stack()->is_empty()) { | |
2655 oop obj = cm->overflow_stack()->pop(); | |
2656 obj->follow_contents(cm); | |
2657 } | |
2658 | |
2659 oop obj; | |
2660 // obj is a reference!!! | |
2661 while (cm->marking_stack()->pop_local(obj)) { | |
2662 // It would be nice to assert about the type of objects we might | |
2663 // pop, but they can come from anywhere, unfortunately. | |
2664 obj->follow_contents(cm); | |
2665 } | |
2666 } | |
2667 | |
2668 void | |
2669 PSParallelCompact::follow_weak_klass_links(ParCompactionManager* serial_cm) { | |
2670 // All klasses on the revisit stack are marked at this point. | |
2671 // Update and follow all subklass, sibling and implementor links. | |
2672 for (uint i = 0; i < ParallelGCThreads+1; i++) { | |
2673 ParCompactionManager* cm = ParCompactionManager::manager_array(i); | |
2674 KeepAliveClosure keep_alive_closure(cm); | |
2675 for (int i = 0; i < cm->revisit_klass_stack()->length(); i++) { | |
2676 cm->revisit_klass_stack()->at(i)->follow_weak_klass_links( | |
2677 is_alive_closure(), | |
2678 &keep_alive_closure); | |
2679 } | |
2680 follow_stack(cm); | |
2681 } | |
2682 } | |
2683 | |
2684 void | |
2685 PSParallelCompact::revisit_weak_klass_link(ParCompactionManager* cm, Klass* k) { | |
2686 cm->revisit_klass_stack()->push(k); | |
2687 } | |
2688 | |
2689 #ifdef VALIDATE_MARK_SWEEP | |
2690 | |
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2691 void PSParallelCompact::track_adjusted_pointer(void* p, bool isroot) { |
0 | 2692 if (!ValidateMarkSweep) |
2693 return; | |
2694 | |
2695 if (!isroot) { | |
2696 if (_pointer_tracking) { | |
2697 guarantee(_adjusted_pointers->contains(p), "should have seen this pointer"); | |
2698 _adjusted_pointers->remove(p); | |
2699 } | |
2700 } else { | |
2701 ptrdiff_t index = _root_refs_stack->find(p); | |
2702 if (index != -1) { | |
2703 int l = _root_refs_stack->length(); | |
2704 if (l > 0 && l - 1 != index) { | |
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2705 void* last = _root_refs_stack->pop(); |
0 | 2706 assert(last != p, "should be different"); |
2707 _root_refs_stack->at_put(index, last); | |
2708 } else { | |
2709 _root_refs_stack->remove(p); | |
2710 } | |
2711 } | |
2712 } | |
2713 } | |
2714 | |
2715 | |
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2716 void PSParallelCompact::check_adjust_pointer(void* p) { |
0 | 2717 _adjusted_pointers->push(p); |
2718 } | |
2719 | |
2720 | |
2721 class AdjusterTracker: public OopClosure { | |
2722 public: | |
2723 AdjusterTracker() {}; | |
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2724 void do_oop(oop* o) { PSParallelCompact::check_adjust_pointer(o); } |
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2725 void do_oop(narrowOop* o) { PSParallelCompact::check_adjust_pointer(o); } |
0 | 2726 }; |
2727 | |
2728 | |
2729 void PSParallelCompact::track_interior_pointers(oop obj) { | |
2730 if (ValidateMarkSweep) { | |
2731 _adjusted_pointers->clear(); | |
2732 _pointer_tracking = true; | |
2733 | |
2734 AdjusterTracker checker; | |
2735 obj->oop_iterate(&checker); | |
2736 } | |
2737 } | |
2738 | |
2739 | |
2740 void PSParallelCompact::check_interior_pointers() { | |
2741 if (ValidateMarkSweep) { | |
2742 _pointer_tracking = false; | |
2743 guarantee(_adjusted_pointers->length() == 0, "should have processed the same pointers"); | |
2744 } | |
2745 } | |
2746 | |
2747 | |
2748 void PSParallelCompact::reset_live_oop_tracking(bool at_perm) { | |
2749 if (ValidateMarkSweep) { | |
2750 guarantee((size_t)_live_oops->length() == _live_oops_index, "should be at end of live oops"); | |
2751 _live_oops_index = at_perm ? _live_oops_index_at_perm : 0; | |
2752 } | |
2753 } | |
2754 | |
2755 | |
2756 void PSParallelCompact::register_live_oop(oop p, size_t size) { | |
2757 if (ValidateMarkSweep) { | |
2758 _live_oops->push(p); | |
2759 _live_oops_size->push(size); | |
2760 _live_oops_index++; | |
2761 } | |
2762 } | |
2763 | |
2764 void PSParallelCompact::validate_live_oop(oop p, size_t size) { | |
2765 if (ValidateMarkSweep) { | |
2766 oop obj = _live_oops->at((int)_live_oops_index); | |
2767 guarantee(obj == p, "should be the same object"); | |
2768 guarantee(_live_oops_size->at((int)_live_oops_index) == size, "should be the same size"); | |
2769 _live_oops_index++; | |
2770 } | |
2771 } | |
2772 | |
2773 void PSParallelCompact::live_oop_moved_to(HeapWord* q, size_t size, | |
2774 HeapWord* compaction_top) { | |
2775 assert(oop(q)->forwardee() == NULL || oop(q)->forwardee() == oop(compaction_top), | |
2776 "should be moved to forwarded location"); | |
2777 if (ValidateMarkSweep) { | |
2778 PSParallelCompact::validate_live_oop(oop(q), size); | |
2779 _live_oops_moved_to->push(oop(compaction_top)); | |
2780 } | |
2781 if (RecordMarkSweepCompaction) { | |
2782 _cur_gc_live_oops->push(q); | |
2783 _cur_gc_live_oops_moved_to->push(compaction_top); | |
2784 _cur_gc_live_oops_size->push(size); | |
2785 } | |
2786 } | |
2787 | |
2788 | |
2789 void PSParallelCompact::compaction_complete() { | |
2790 if (RecordMarkSweepCompaction) { | |
2791 GrowableArray<HeapWord*>* _tmp_live_oops = _cur_gc_live_oops; | |
2792 GrowableArray<HeapWord*>* _tmp_live_oops_moved_to = _cur_gc_live_oops_moved_to; | |
2793 GrowableArray<size_t> * _tmp_live_oops_size = _cur_gc_live_oops_size; | |
2794 | |
2795 _cur_gc_live_oops = _last_gc_live_oops; | |
2796 _cur_gc_live_oops_moved_to = _last_gc_live_oops_moved_to; | |
2797 _cur_gc_live_oops_size = _last_gc_live_oops_size; | |
2798 _last_gc_live_oops = _tmp_live_oops; | |
2799 _last_gc_live_oops_moved_to = _tmp_live_oops_moved_to; | |
2800 _last_gc_live_oops_size = _tmp_live_oops_size; | |
2801 } | |
2802 } | |
2803 | |
2804 | |
2805 void PSParallelCompact::print_new_location_of_heap_address(HeapWord* q) { | |
2806 if (!RecordMarkSweepCompaction) { | |
2807 tty->print_cr("Requires RecordMarkSweepCompaction to be enabled"); | |
2808 return; | |
2809 } | |
2810 | |
2811 if (_last_gc_live_oops == NULL) { | |
2812 tty->print_cr("No compaction information gathered yet"); | |
2813 return; | |
2814 } | |
2815 | |
2816 for (int i = 0; i < _last_gc_live_oops->length(); i++) { | |
2817 HeapWord* old_oop = _last_gc_live_oops->at(i); | |
2818 size_t sz = _last_gc_live_oops_size->at(i); | |
2819 if (old_oop <= q && q < (old_oop + sz)) { | |
2820 HeapWord* new_oop = _last_gc_live_oops_moved_to->at(i); | |
2821 size_t offset = (q - old_oop); | |
2822 tty->print_cr("Address " PTR_FORMAT, q); | |
2823 tty->print_cr(" Was in oop " PTR_FORMAT ", size %d, at offset %d", old_oop, sz, offset); | |
2824 tty->print_cr(" Now in oop " PTR_FORMAT ", actual address " PTR_FORMAT, new_oop, new_oop + offset); | |
2825 return; | |
2826 } | |
2827 } | |
2828 | |
2829 tty->print_cr("Address " PTR_FORMAT " not found in live oop information from last GC", q); | |
2830 } | |
2831 #endif //VALIDATE_MARK_SWEEP | |
2832 | |
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2833 // Update interior oops in the ranges of regions [beg_region, end_region). |
0 | 2834 void |
2835 PSParallelCompact::update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, | |
2836 SpaceId space_id, | |
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2837 size_t beg_region, |
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2838 size_t end_region) { |
0 | 2839 ParallelCompactData& sd = summary_data(); |
2840 ParMarkBitMap* const mbm = mark_bitmap(); | |
2841 | |
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2842 HeapWord* beg_addr = sd.region_to_addr(beg_region); |
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2843 HeapWord* const end_addr = sd.region_to_addr(end_region); |
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2844 assert(beg_region <= end_region, "bad region range"); |
0 | 2845 assert(end_addr <= dense_prefix(space_id), "not in the dense prefix"); |
2846 | |
2847 #ifdef ASSERT | |
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2848 // Claim the regions to avoid triggering an assert when they are marked as |
0 | 2849 // filled. |
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2850 for (size_t claim_region = beg_region; claim_region < end_region; ++claim_region) { |
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2851 assert(sd.region(claim_region)->claim_unsafe(), "claim() failed"); |
0 | 2852 } |
2853 #endif // #ifdef ASSERT | |
2854 | |
2855 if (beg_addr != space(space_id)->bottom()) { | |
2856 // Find the first live object or block of dead space that *starts* in this | |
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2857 // range of regions. If a partial object crosses onto the region, skip it; |
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2858 // it will be marked for 'deferred update' when the object head is |
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2859 // processed. If dead space crosses onto the region, it is also skipped; it |
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2860 // will be filled when the prior region is processed. If neither of those |
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2861 // apply, the first word in the region is the start of a live object or dead |
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2862 // space. |
0 | 2863 assert(beg_addr > space(space_id)->bottom(), "sanity"); |
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2864 const RegionData* const cp = sd.region(beg_region); |
0 | 2865 if (cp->partial_obj_size() != 0) { |
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2866 beg_addr = sd.partial_obj_end(beg_region); |
0 | 2867 } else if (dead_space_crosses_boundary(cp, mbm->addr_to_bit(beg_addr))) { |
2868 beg_addr = mbm->find_obj_beg(beg_addr, end_addr); | |
2869 } | |
2870 } | |
2871 | |
2872 if (beg_addr < end_addr) { | |
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2873 // A live object or block of dead space starts in this range of Regions. |
0 | 2874 HeapWord* const dense_prefix_end = dense_prefix(space_id); |
2875 | |
2876 // Create closures and iterate. | |
2877 UpdateOnlyClosure update_closure(mbm, cm, space_id); | |
2878 FillClosure fill_closure(cm, space_id); | |
2879 ParMarkBitMap::IterationStatus status; | |
2880 status = mbm->iterate(&update_closure, &fill_closure, beg_addr, end_addr, | |
2881 dense_prefix_end); | |
2882 if (status == ParMarkBitMap::incomplete) { | |
2883 update_closure.do_addr(update_closure.source()); | |
2884 } | |
2885 } | |
2886 | |
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2887 // Mark the regions as filled. |
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2888 RegionData* const beg_cp = sd.region(beg_region); |
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2889 RegionData* const end_cp = sd.region(end_region); |
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2890 for (RegionData* cp = beg_cp; cp < end_cp; ++cp) { |
0 | 2891 cp->set_completed(); |
2892 } | |
2893 } | |
2894 | |
2895 // Return the SpaceId for the space containing addr. If addr is not in the | |
2896 // heap, last_space_id is returned. In debug mode it expects the address to be | |
2897 // in the heap and asserts such. | |
2898 PSParallelCompact::SpaceId PSParallelCompact::space_id(HeapWord* addr) { | |
2899 assert(Universe::heap()->is_in_reserved(addr), "addr not in the heap"); | |
2900 | |
2901 for (unsigned int id = perm_space_id; id < last_space_id; ++id) { | |
2902 if (_space_info[id].space()->contains(addr)) { | |
2903 return SpaceId(id); | |
2904 } | |
2905 } | |
2906 | |
2907 assert(false, "no space contains the addr"); | |
2908 return last_space_id; | |
2909 } | |
2910 | |
2911 void PSParallelCompact::update_deferred_objects(ParCompactionManager* cm, | |
2912 SpaceId id) { | |
2913 assert(id < last_space_id, "bad space id"); | |
2914 | |
2915 ParallelCompactData& sd = summary_data(); | |
2916 const SpaceInfo* const space_info = _space_info + id; | |
2917 ObjectStartArray* const start_array = space_info->start_array(); | |
2918 | |
2919 const MutableSpace* const space = space_info->space(); | |
2920 assert(space_info->dense_prefix() >= space->bottom(), "dense_prefix not set"); | |
2921 HeapWord* const beg_addr = space_info->dense_prefix(); | |
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2922 HeapWord* const end_addr = sd.region_align_up(space_info->new_top()); |
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2923 |
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2924 const RegionData* const beg_region = sd.addr_to_region_ptr(beg_addr); |
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2925 const RegionData* const end_region = sd.addr_to_region_ptr(end_addr); |
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2926 const RegionData* cur_region; |
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2927 for (cur_region = beg_region; cur_region < end_region; ++cur_region) { |
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2928 HeapWord* const addr = cur_region->deferred_obj_addr(); |
0 | 2929 if (addr != NULL) { |
2930 if (start_array != NULL) { | |
2931 start_array->allocate_block(addr); | |
2932 } | |
2933 oop(addr)->update_contents(cm); | |
2934 assert(oop(addr)->is_oop_or_null(), "should be an oop now"); | |
2935 } | |
2936 } | |
2937 } | |
2938 | |
2939 // Skip over count live words starting from beg, and return the address of the | |
2940 // next live word. Unless marked, the word corresponding to beg is assumed to | |
2941 // be dead. Callers must either ensure beg does not correspond to the middle of | |
2942 // an object, or account for those live words in some other way. Callers must | |
2943 // also ensure that there are enough live words in the range [beg, end) to skip. | |
2944 HeapWord* | |
2945 PSParallelCompact::skip_live_words(HeapWord* beg, HeapWord* end, size_t count) | |
2946 { | |
2947 assert(count > 0, "sanity"); | |
2948 | |
2949 ParMarkBitMap* m = mark_bitmap(); | |
2950 idx_t bits_to_skip = m->words_to_bits(count); | |
2951 idx_t cur_beg = m->addr_to_bit(beg); | |
2952 const idx_t search_end = BitMap::word_align_up(m->addr_to_bit(end)); | |
2953 | |
2954 do { | |
2955 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2956 idx_t cur_end = m->find_obj_end(cur_beg, search_end); | |
2957 const size_t obj_bits = cur_end - cur_beg + 1; | |
2958 if (obj_bits > bits_to_skip) { | |
2959 return m->bit_to_addr(cur_beg + bits_to_skip); | |
2960 } | |
2961 bits_to_skip -= obj_bits; | |
2962 cur_beg = cur_end + 1; | |
2963 } while (bits_to_skip > 0); | |
2964 | |
2965 // Skipping the desired number of words landed just past the end of an object. | |
2966 // Find the start of the next object. | |
2967 cur_beg = m->find_obj_beg(cur_beg, search_end); | |
2968 assert(cur_beg < m->addr_to_bit(end), "not enough live words to skip"); | |
2969 return m->bit_to_addr(cur_beg); | |
2970 } | |
2971 | |
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2972 HeapWord* PSParallelCompact::first_src_addr(HeapWord* const dest_addr, |
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2973 SpaceId src_space_id, |
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2974 size_t src_region_idx) |
0 | 2975 { |
482
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2976 assert(summary_data().is_region_aligned(dest_addr), "not aligned"); |
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2977 |
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2978 const SplitInfo& split_info = _space_info[src_space_id].split_info(); |
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2979 if (split_info.dest_region_addr() == dest_addr) { |
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2980 // The partial object ending at the split point contains the first word to |
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2981 // be copied to dest_addr. |
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2982 return split_info.first_src_addr(); |
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2983 } |
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2984 |
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2985 const ParallelCompactData& sd = summary_data(); |
0 | 2986 ParMarkBitMap* const bitmap = mark_bitmap(); |
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2987 const size_t RegionSize = ParallelCompactData::RegionSize; |
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2988 |
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2989 assert(sd.is_region_aligned(dest_addr), "not aligned"); |
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2990 const RegionData* const src_region_ptr = sd.region(src_region_idx); |
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2991 const size_t partial_obj_size = src_region_ptr->partial_obj_size(); |
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2992 HeapWord* const src_region_destination = src_region_ptr->destination(); |
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2993 |
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2994 assert(dest_addr >= src_region_destination, "wrong src region"); |
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2995 assert(src_region_ptr->data_size() > 0, "src region cannot be empty"); |
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2996 |
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2997 HeapWord* const src_region_beg = sd.region_to_addr(src_region_idx); |
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2998 HeapWord* const src_region_end = src_region_beg + RegionSize; |
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2999 |
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3000 HeapWord* addr = src_region_beg; |
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3001 if (dest_addr == src_region_destination) { |
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3002 // Return the first live word in the source region. |
0 | 3003 if (partial_obj_size == 0) { |
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3004 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3005 assert(addr < src_region_end, "no objects start in src region"); |
0 | 3006 } |
3007 return addr; | |
3008 } | |
3009 | |
3010 // Must skip some live data. | |
375
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3011 size_t words_to_skip = dest_addr - src_region_destination; |
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3012 assert(src_region_ptr->data_size() > words_to_skip, "wrong src region"); |
0 | 3013 |
3014 if (partial_obj_size >= words_to_skip) { | |
3015 // All the live words to skip are part of the partial object. | |
3016 addr += words_to_skip; | |
3017 if (partial_obj_size == words_to_skip) { | |
3018 // Find the first live word past the partial object. | |
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3019 addr = bitmap->find_obj_beg(addr, src_region_end); |
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3020 assert(addr < src_region_end, "wrong src region"); |
0 | 3021 } |
3022 return addr; | |
3023 } | |
3024 | |
3025 // Skip over the partial object (if any). | |
3026 if (partial_obj_size != 0) { | |
3027 words_to_skip -= partial_obj_size; | |
3028 addr += partial_obj_size; | |
3029 } | |
3030 | |
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3031 // Skip over live words due to objects that start in the region. |
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3032 addr = skip_live_words(addr, src_region_end, words_to_skip); |
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3033 assert(addr < src_region_end, "wrong src region"); |
0 | 3034 return addr; |
3035 } | |
3036 | |
3037 void PSParallelCompact::decrement_destination_counts(ParCompactionManager* cm, | |
495
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3038 SpaceId src_space_id, |
375
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3039 size_t beg_region, |
0 | 3040 HeapWord* end_addr) |
3041 { | |
3042 ParallelCompactData& sd = summary_data(); | |
495
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3043 |
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3044 #ifdef ASSERT |
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3045 MutableSpace* const src_space = _space_info[src_space_id].space(); |
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3046 HeapWord* const beg_addr = sd.region_to_addr(beg_region); |
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3047 assert(src_space->contains(beg_addr) || beg_addr == src_space->end(), |
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3048 "src_space_id does not match beg_addr"); |
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3049 assert(src_space->contains(end_addr) || end_addr == src_space->end(), |
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3050 "src_space_id does not match end_addr"); |
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3051 #endif // #ifdef ASSERT |
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3052 |
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3053 RegionData* const beg = sd.region(beg_region); |
495
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3054 RegionData* const end = sd.addr_to_region_ptr(sd.region_align_up(end_addr)); |
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3055 |
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3056 // Regions up to new_top() are enqueued if they become available. |
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3057 HeapWord* const new_top = _space_info[src_space_id].new_top(); |
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3058 RegionData* const enqueue_end = |
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3059 sd.addr_to_region_ptr(sd.region_align_up(new_top)); |
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3060 |
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3061 for (RegionData* cur = beg; cur < end; ++cur) { |
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3062 assert(cur->data_size() > 0, "region must have live data"); |
0 | 3063 cur->decrement_destination_count(); |
495
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3064 if (cur < enqueue_end && cur->available() && cur->claim()) { |
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3065 cm->save_for_processing(sd.region(cur)); |
0 | 3066 } |
3067 } | |
3068 } | |
3069 | |
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3070 size_t PSParallelCompact::next_src_region(MoveAndUpdateClosure& closure, |
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3071 SpaceId& src_space_id, |
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3072 HeapWord*& src_space_top, |
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3073 HeapWord* end_addr) |
0 | 3074 { |
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3075 typedef ParallelCompactData::RegionData RegionData; |
0 | 3076 |
3077 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
375
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3078 const size_t region_size = ParallelCompactData::RegionSize; |
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3079 |
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3080 size_t src_region_idx = 0; |
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3081 |
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3082 // Skip empty regions (if any) up to the top of the space. |
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3083 HeapWord* const src_aligned_up = sd.region_align_up(end_addr); |
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3084 RegionData* src_region_ptr = sd.addr_to_region_ptr(src_aligned_up); |
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3085 HeapWord* const top_aligned_up = sd.region_align_up(src_space_top); |
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3086 const RegionData* const top_region_ptr = |
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3087 sd.addr_to_region_ptr(top_aligned_up); |
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3088 while (src_region_ptr < top_region_ptr && src_region_ptr->data_size() == 0) { |
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3089 ++src_region_ptr; |
0 | 3090 } |
3091 | |
375
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3092 if (src_region_ptr < top_region_ptr) { |
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3093 // The next source region is in the current space. Update src_region_idx |
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3094 // and the source address to match src_region_ptr. |
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3095 src_region_idx = sd.region(src_region_ptr); |
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3096 HeapWord* const src_region_addr = sd.region_to_addr(src_region_idx); |
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3097 if (src_region_addr > closure.source()) { |
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3098 closure.set_source(src_region_addr); |
0 | 3099 } |
375
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3100 return src_region_idx; |
0 | 3101 } |
3102 | |
375
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3103 // Switch to a new source space and find the first non-empty region. |
0 | 3104 unsigned int space_id = src_space_id + 1; |
3105 assert(space_id < last_space_id, "not enough spaces"); | |
3106 | |
3107 HeapWord* const destination = closure.destination(); | |
3108 | |
3109 do { | |
3110 MutableSpace* space = _space_info[space_id].space(); | |
3111 HeapWord* const bottom = space->bottom(); | |
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3112 const RegionData* const bottom_cp = sd.addr_to_region_ptr(bottom); |
0 | 3113 |
3114 // Iterate over the spaces that do not compact into themselves. | |
3115 if (bottom_cp->destination() != bottom) { | |
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3116 HeapWord* const top_aligned_up = sd.region_align_up(space->top()); |
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3117 const RegionData* const top_cp = sd.addr_to_region_ptr(top_aligned_up); |
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3118 |
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3119 for (const RegionData* src_cp = bottom_cp; src_cp < top_cp; ++src_cp) { |
0 | 3120 if (src_cp->live_obj_size() > 0) { |
3121 // Found it. | |
3122 assert(src_cp->destination() == destination, | |
3123 "first live obj in the space must match the destination"); | |
3124 assert(src_cp->partial_obj_size() == 0, | |
3125 "a space cannot begin with a partial obj"); | |
3126 | |
3127 src_space_id = SpaceId(space_id); | |
3128 src_space_top = space->top(); | |
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3129 const size_t src_region_idx = sd.region(src_cp); |
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3130 closure.set_source(sd.region_to_addr(src_region_idx)); |
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3131 return src_region_idx; |
0 | 3132 } else { |
3133 assert(src_cp->data_size() == 0, "sanity"); | |
3134 } | |
3135 } | |
3136 } | |
3137 } while (++space_id < last_space_id); | |
3138 | |
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3139 assert(false, "no source region was found"); |
0 | 3140 return 0; |
3141 } | |
3142 | |
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3143 void PSParallelCompact::fill_region(ParCompactionManager* cm, size_t region_idx) |
0 | 3144 { |
3145 typedef ParMarkBitMap::IterationStatus IterationStatus; | |
375
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3146 const size_t RegionSize = ParallelCompactData::RegionSize; |
0 | 3147 ParMarkBitMap* const bitmap = mark_bitmap(); |
3148 ParallelCompactData& sd = summary_data(); | |
375
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3149 RegionData* const region_ptr = sd.region(region_idx); |
0 | 3150 |
3151 // Get the items needed to construct the closure. | |
375
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3152 HeapWord* dest_addr = sd.region_to_addr(region_idx); |
0 | 3153 SpaceId dest_space_id = space_id(dest_addr); |
3154 ObjectStartArray* start_array = _space_info[dest_space_id].start_array(); | |
3155 HeapWord* new_top = _space_info[dest_space_id].new_top(); | |
3156 assert(dest_addr < new_top, "sanity"); | |
375
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3157 const size_t words = MIN2(pointer_delta(new_top, dest_addr), RegionSize); |
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3158 |
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|
3159 // Get the source region and related info. |
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3160 size_t src_region_idx = region_ptr->source_region(); |
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3161 SpaceId src_space_id = space_id(sd.region_to_addr(src_region_idx)); |
0 | 3162 HeapWord* src_space_top = _space_info[src_space_id].space()->top(); |
3163 | |
3164 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
482
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3165 closure.set_source(first_src_addr(dest_addr, src_space_id, src_region_idx)); |
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3166 |
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3167 // Adjust src_region_idx to prepare for decrementing destination counts (the |
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3168 // destination count is not decremented when a region is copied to itself). |
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3169 if (src_region_idx == region_idx) { |
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3170 src_region_idx += 1; |
0 | 3171 } |
3172 | |
3173 if (bitmap->is_unmarked(closure.source())) { | |
3174 // The first source word is in the middle of an object; copy the remainder | |
3175 // of the object or as much as will fit. The fact that pointer updates were | |
3176 // deferred will be noted when the object header is processed. | |
3177 HeapWord* const old_src_addr = closure.source(); | |
3178 closure.copy_partial_obj(); | |
3179 if (closure.is_full()) { | |
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3180 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3181 closure.source()); |
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3182 region_ptr->set_deferred_obj_addr(NULL); |
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3183 region_ptr->set_completed(); |
0 | 3184 return; |
3185 } | |
3186 | |
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3187 HeapWord* const end_addr = sd.region_align_down(closure.source()); |
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3188 if (sd.region_align_down(old_src_addr) != end_addr) { |
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3189 // The partial object was copied from more than one source region. |
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3190 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3191 |
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3192 // Move to the next source region, possibly switching spaces as well. All |
0 | 3193 // args except end_addr may be modified. |
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3194 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3195 end_addr); |
0 | 3196 } |
3197 } | |
3198 | |
3199 do { | |
3200 HeapWord* const cur_addr = closure.source(); | |
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3201 HeapWord* const end_addr = MIN2(sd.region_align_up(cur_addr + 1), |
0 | 3202 src_space_top); |
3203 IterationStatus status = bitmap->iterate(&closure, cur_addr, end_addr); | |
3204 | |
3205 if (status == ParMarkBitMap::incomplete) { | |
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3206 // The last obj that starts in the source region does not end in the |
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3207 // region. |
0 | 3208 assert(closure.source() < end_addr, "sanity") |
3209 HeapWord* const obj_beg = closure.source(); | |
3210 HeapWord* const range_end = MIN2(obj_beg + closure.words_remaining(), | |
3211 src_space_top); | |
3212 HeapWord* const obj_end = bitmap->find_obj_end(obj_beg, range_end); | |
3213 if (obj_end < range_end) { | |
3214 // The end was found; the entire object will fit. | |
3215 status = closure.do_addr(obj_beg, bitmap->obj_size(obj_beg, obj_end)); | |
3216 assert(status != ParMarkBitMap::would_overflow, "sanity"); | |
3217 } else { | |
3218 // The end was not found; the object will not fit. | |
3219 assert(range_end < src_space_top, "obj cannot cross space boundary"); | |
3220 status = ParMarkBitMap::would_overflow; | |
3221 } | |
3222 } | |
3223 | |
3224 if (status == ParMarkBitMap::would_overflow) { | |
3225 // The last object did not fit. Note that interior oop updates were | |
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3226 // deferred, then copy enough of the object to fill the region. |
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3227 region_ptr->set_deferred_obj_addr(closure.destination()); |
0 | 3228 status = closure.copy_until_full(); // copies from closure.source() |
3229 | |
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3230 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3231 closure.source()); |
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3232 region_ptr->set_completed(); |
0 | 3233 return; |
3234 } | |
3235 | |
3236 if (status == ParMarkBitMap::full) { | |
495
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3237 decrement_destination_counts(cm, src_space_id, src_region_idx, |
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3238 closure.source()); |
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3239 region_ptr->set_deferred_obj_addr(NULL); |
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3240 region_ptr->set_completed(); |
0 | 3241 return; |
3242 } | |
3243 | |
495
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3244 decrement_destination_counts(cm, src_space_id, src_region_idx, end_addr); |
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3245 |
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3246 // Move to the next source region, possibly switching spaces as well. All |
0 | 3247 // args except end_addr may be modified. |
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3248 src_region_idx = next_src_region(closure, src_space_id, src_space_top, |
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3249 end_addr); |
0 | 3250 } while (true); |
3251 } | |
3252 | |
3253 void | |
3254 PSParallelCompact::move_and_update(ParCompactionManager* cm, SpaceId space_id) { | |
3255 const MutableSpace* sp = space(space_id); | |
3256 if (sp->is_empty()) { | |
3257 return; | |
3258 } | |
3259 | |
3260 ParallelCompactData& sd = PSParallelCompact::summary_data(); | |
3261 ParMarkBitMap* const bitmap = mark_bitmap(); | |
3262 HeapWord* const dp_addr = dense_prefix(space_id); | |
3263 HeapWord* beg_addr = sp->bottom(); | |
3264 HeapWord* end_addr = sp->top(); | |
3265 | |
3266 #ifdef ASSERT | |
3267 assert(beg_addr <= dp_addr && dp_addr <= end_addr, "bad dense prefix"); | |
3268 if (cm->should_verify_only()) { | |
3269 VerifyUpdateClosure verify_update(cm, sp); | |
3270 bitmap->iterate(&verify_update, beg_addr, end_addr); | |
3271 return; | |
3272 } | |
3273 | |
3274 if (cm->should_reset_only()) { | |
3275 ResetObjectsClosure reset_objects(cm); | |
3276 bitmap->iterate(&reset_objects, beg_addr, end_addr); | |
3277 return; | |
3278 } | |
3279 #endif | |
3280 | |
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3281 const size_t beg_region = sd.addr_to_region_idx(beg_addr); |
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3282 const size_t dp_region = sd.addr_to_region_idx(dp_addr); |
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3283 if (beg_region < dp_region) { |
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3284 update_and_deadwood_in_dense_prefix(cm, space_id, beg_region, dp_region); |
0 | 3285 } |
3286 | |
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3287 // The destination of the first live object that starts in the region is one |
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3288 // past the end of the partial object entering the region (if any). |
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3289 HeapWord* const dest_addr = sd.partial_obj_end(dp_region); |
0 | 3290 HeapWord* const new_top = _space_info[space_id].new_top(); |
3291 assert(new_top >= dest_addr, "bad new_top value"); | |
3292 const size_t words = pointer_delta(new_top, dest_addr); | |
3293 | |
3294 if (words > 0) { | |
3295 ObjectStartArray* start_array = _space_info[space_id].start_array(); | |
3296 MoveAndUpdateClosure closure(bitmap, cm, start_array, dest_addr, words); | |
3297 | |
3298 ParMarkBitMap::IterationStatus status; | |
3299 status = bitmap->iterate(&closure, dest_addr, end_addr); | |
3300 assert(status == ParMarkBitMap::full, "iteration not complete"); | |
3301 assert(bitmap->find_obj_beg(closure.source(), end_addr) == end_addr, | |
3302 "live objects skipped because closure is full"); | |
3303 } | |
3304 } | |
3305 | |
3306 jlong PSParallelCompact::millis_since_last_gc() { | |
3307 jlong ret_val = os::javaTimeMillis() - _time_of_last_gc; | |
3308 // XXX See note in genCollectedHeap::millis_since_last_gc(). | |
3309 if (ret_val < 0) { | |
3310 NOT_PRODUCT(warning("time warp: %d", ret_val);) | |
3311 return 0; | |
3312 } | |
3313 return ret_val; | |
3314 } | |
3315 | |
3316 void PSParallelCompact::reset_millis_since_last_gc() { | |
3317 _time_of_last_gc = os::javaTimeMillis(); | |
3318 } | |
3319 | |
3320 ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() | |
3321 { | |
3322 if (source() != destination()) { | |
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3323 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3324 Copy::aligned_conjoint_words(source(), destination(), words_remaining()); |
3325 } | |
3326 update_state(words_remaining()); | |
3327 assert(is_full(), "sanity"); | |
3328 return ParMarkBitMap::full; | |
3329 } | |
3330 | |
3331 void MoveAndUpdateClosure::copy_partial_obj() | |
3332 { | |
3333 size_t words = words_remaining(); | |
3334 | |
3335 HeapWord* const range_end = MIN2(source() + words, bitmap()->region_end()); | |
3336 HeapWord* const end_addr = bitmap()->find_obj_end(source(), range_end); | |
3337 if (end_addr < range_end) { | |
3338 words = bitmap()->obj_size(source(), end_addr); | |
3339 } | |
3340 | |
3341 // This test is necessary; if omitted, the pointer updates to a partial object | |
3342 // that crosses the dense prefix boundary could be overwritten. | |
3343 if (source() != destination()) { | |
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3344 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3345 Copy::aligned_conjoint_words(source(), destination(), words); |
3346 } | |
3347 update_state(words); | |
3348 } | |
3349 | |
3350 ParMarkBitMapClosure::IterationStatus | |
3351 MoveAndUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3352 assert(destination() != NULL, "sanity"); | |
3353 assert(bitmap()->obj_size(addr) == words, "bad size"); | |
3354 | |
3355 _source = addr; | |
3356 assert(PSParallelCompact::summary_data().calc_new_pointer(source()) == | |
3357 destination(), "wrong destination"); | |
3358 | |
3359 if (words > words_remaining()) { | |
3360 return ParMarkBitMap::would_overflow; | |
3361 } | |
3362 | |
3363 // The start_array must be updated even if the object is not moving. | |
3364 if (_start_array != NULL) { | |
3365 _start_array->allocate_block(destination()); | |
3366 } | |
3367 | |
3368 if (destination() != source()) { | |
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3369 DEBUG_ONLY(PSParallelCompact::check_new_location(source(), destination());) |
0 | 3370 Copy::aligned_conjoint_words(source(), destination(), words); |
3371 } | |
3372 | |
3373 oop moved_oop = (oop) destination(); | |
3374 moved_oop->update_contents(compaction_manager()); | |
3375 assert(moved_oop->is_oop_or_null(), "Object should be whole at this point"); | |
3376 | |
3377 update_state(words); | |
3378 assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity"); | |
3379 return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete; | |
3380 } | |
3381 | |
3382 UpdateOnlyClosure::UpdateOnlyClosure(ParMarkBitMap* mbm, | |
3383 ParCompactionManager* cm, | |
3384 PSParallelCompact::SpaceId space_id) : | |
3385 ParMarkBitMapClosure(mbm, cm), | |
3386 _space_id(space_id), | |
3387 _start_array(PSParallelCompact::start_array(space_id)) | |
3388 { | |
3389 } | |
3390 | |
3391 // Updates the references in the object to their new values. | |
3392 ParMarkBitMapClosure::IterationStatus | |
3393 UpdateOnlyClosure::do_addr(HeapWord* addr, size_t words) { | |
3394 do_addr(addr); | |
3395 return ParMarkBitMap::incomplete; | |
3396 } | |
3397 | |
3398 // Verify the new location using the forwarding pointer | |
3399 // from MarkSweep::mark_sweep_phase2(). Set the mark_word | |
3400 // to the initial value. | |
3401 ParMarkBitMapClosure::IterationStatus | |
3402 PSParallelCompact::VerifyUpdateClosure::do_addr(HeapWord* addr, size_t words) { | |
3403 // The second arg (words) is not used. | |
3404 oop obj = (oop) addr; | |
3405 HeapWord* forwarding_ptr = (HeapWord*) obj->mark()->decode_pointer(); | |
3406 HeapWord* new_pointer = summary_data().calc_new_pointer(obj); | |
3407 if (forwarding_ptr == NULL) { | |
3408 // The object is dead or not moving. | |
3409 assert(bitmap()->is_unmarked(obj) || (new_pointer == (HeapWord*) obj), | |
3410 "Object liveness is wrong."); | |
3411 return ParMarkBitMap::incomplete; | |
3412 } | |
3413 assert(UseParallelOldGCDensePrefix || | |
3414 (HeapMaximumCompactionInterval > 1) || | |
3415 (MarkSweepAlwaysCompactCount > 1) || | |
3416 (forwarding_ptr == new_pointer), | |
3417 "Calculation of new location is incorrect"); | |
3418 return ParMarkBitMap::incomplete; | |
3419 } | |
3420 | |
3421 // Reset objects modified for debug checking. | |
3422 ParMarkBitMapClosure::IterationStatus | |
3423 PSParallelCompact::ResetObjectsClosure::do_addr(HeapWord* addr, size_t words) { | |
3424 // The second arg (words) is not used. | |
3425 oop obj = (oop) addr; | |
3426 obj->init_mark(); | |
3427 return ParMarkBitMap::incomplete; | |
3428 } | |
3429 | |
3430 // Prepare for compaction. This method is executed once | |
3431 // (i.e., by a single thread) before compaction. | |
3432 // Save the updated location of the intArrayKlassObj for | |
3433 // filling holes in the dense prefix. | |
3434 void PSParallelCompact::compact_prologue() { | |
3435 _updated_int_array_klass_obj = (klassOop) | |
3436 summary_data().calc_new_pointer(Universe::intArrayKlassObj()); | |
3437 } | |
3438 |