Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 20306:e02e18f40eae
8050973: CMS/G1 GC: add missing Resource and Handle mark
Summary: Add Resource/HandleMark in the work() method of some AbstractGangTask to reclaim these resources earlier.
Reviewed-by: tschatzl, goetz
author | mdoerr |
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date | Tue, 29 Jul 2014 10:26:09 +0200 |
parents | 3bf2fc51186b |
children | bfba6779654b |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
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27 #include "code/codeCache.hpp" |
3771 | 28 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 29 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
30 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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32 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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33 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 34 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 35 #include "gc_implementation/g1/g1RemSet.hpp" |
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36 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 37 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
38 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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39 #include "gc_implementation/shared/vmGCOperations.hpp" |
10405 | 40 #include "gc_implementation/shared/gcTimer.hpp" |
41 #include "gc_implementation/shared/gcTrace.hpp" | |
42 #include "gc_implementation/shared/gcTraceTime.hpp" | |
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43 #include "memory/allocation.hpp" |
1972 | 44 #include "memory/genOopClosures.inline.hpp" |
45 #include "memory/referencePolicy.hpp" | |
46 #include "memory/resourceArea.hpp" | |
47 #include "oops/oop.inline.hpp" | |
48 #include "runtime/handles.inline.hpp" | |
49 #include "runtime/java.hpp" | |
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50 #include "runtime/prefetch.inline.hpp" |
6197 | 51 #include "services/memTracker.hpp" |
342 | 52 |
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53 // Concurrent marking bit map wrapper |
342 | 54 |
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55 CMBitMapRO::CMBitMapRO(int shifter) : |
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56 _bm(), |
342 | 57 _shifter(shifter) { |
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58 _bmStartWord = 0; |
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59 _bmWordSize = 0; |
342 | 60 } |
61 | |
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62 HeapWord* CMBitMapRO::getNextMarkedWordAddress(const HeapWord* addr, |
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63 const HeapWord* limit) const { |
342 | 64 // First we must round addr *up* to a possible object boundary. |
65 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
66 HeapWordSize << _shifter); | |
67 size_t addrOffset = heapWordToOffset(addr); | |
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68 if (limit == NULL) { |
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69 limit = _bmStartWord + _bmWordSize; |
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70 } |
342 | 71 size_t limitOffset = heapWordToOffset(limit); |
72 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
73 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
74 assert(nextAddr >= addr, "get_next_one postcondition"); | |
75 assert(nextAddr == limit || isMarked(nextAddr), | |
76 "get_next_one postcondition"); | |
77 return nextAddr; | |
78 } | |
79 | |
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80 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(const HeapWord* addr, |
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81 const HeapWord* limit) const { |
342 | 82 size_t addrOffset = heapWordToOffset(addr); |
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83 if (limit == NULL) { |
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84 limit = _bmStartWord + _bmWordSize; |
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85 } |
342 | 86 size_t limitOffset = heapWordToOffset(limit); |
87 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
88 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
89 assert(nextAddr >= addr, "get_next_one postcondition"); | |
90 assert(nextAddr == limit || !isMarked(nextAddr), | |
91 "get_next_one postcondition"); | |
92 return nextAddr; | |
93 } | |
94 | |
95 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
96 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
97 return (int) (diff >> _shifter); | |
98 } | |
99 | |
100 #ifndef PRODUCT | |
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101 bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
342 | 102 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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103 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 104 "size inconsistency"); |
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105 return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
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106 _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
342 | 107 } |
108 #endif | |
109 | |
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110 void CMBitMapRO::print_on_error(outputStream* st, const char* prefix) const { |
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111 _bm.print_on_error(st, prefix); |
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112 } |
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113 |
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114 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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115 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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116 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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117 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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118 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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119 if (!brs.is_reserved()) { |
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120 warning("ConcurrentMark marking bit map allocation failure"); |
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121 return false; |
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122 } |
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123 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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124 // For now we'll just commit all of the bit map up front. |
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125 // Later on we'll try to be more parsimonious with swap. |
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126 if (!_virtual_space.initialize(brs, brs.size())) { |
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127 warning("ConcurrentMark marking bit map backing store failure"); |
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128 return false; |
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129 } |
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130 assert(_virtual_space.committed_size() == brs.size(), |
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131 "didn't reserve backing store for all of concurrent marking bit map?"); |
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132 _bm.set_map((BitMap::bm_word_t*)_virtual_space.low()); |
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133 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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134 _bmWordSize, "inconsistency in bit map sizing"); |
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135 _bm.set_size(_bmWordSize >> _shifter); |
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136 return true; |
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137 } |
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138 |
342 | 139 void CMBitMap::clearAll() { |
140 _bm.clear(); | |
141 return; | |
142 } | |
143 | |
144 void CMBitMap::markRange(MemRegion mr) { | |
145 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
146 assert(!mr.is_empty(), "unexpected empty region"); | |
147 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
148 ((HeapWord *) mr.end())), | |
149 "markRange memory region end is not card aligned"); | |
150 // convert address range into offset range | |
151 _bm.at_put_range(heapWordToOffset(mr.start()), | |
152 heapWordToOffset(mr.end()), true); | |
153 } | |
154 | |
155 void CMBitMap::clearRange(MemRegion mr) { | |
156 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
157 assert(!mr.is_empty(), "unexpected empty region"); | |
158 // convert address range into offset range | |
159 _bm.at_put_range(heapWordToOffset(mr.start()), | |
160 heapWordToOffset(mr.end()), false); | |
161 } | |
162 | |
163 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
164 HeapWord* end_addr) { | |
165 HeapWord* start = getNextMarkedWordAddress(addr); | |
166 start = MIN2(start, end_addr); | |
167 HeapWord* end = getNextUnmarkedWordAddress(start); | |
168 end = MIN2(end, end_addr); | |
169 assert(start <= end, "Consistency check"); | |
170 MemRegion mr(start, end); | |
171 if (!mr.is_empty()) { | |
172 clearRange(mr); | |
173 } | |
174 return mr; | |
175 } | |
176 | |
177 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
178 _base(NULL), _cm(cm) | |
179 #ifdef ASSERT | |
180 , _drain_in_progress(false) | |
181 , _drain_in_progress_yields(false) | |
182 #endif | |
183 {} | |
184 | |
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185 bool CMMarkStack::allocate(size_t capacity) { |
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186 // allocate a stack of the requisite depth |
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187 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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188 if (!rs.is_reserved()) { |
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189 warning("ConcurrentMark MarkStack allocation failure"); |
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190 return false; |
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191 } |
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192 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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193 if (!_virtual_space.initialize(rs, rs.size())) { |
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194 warning("ConcurrentMark MarkStack backing store failure"); |
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195 // Release the virtual memory reserved for the marking stack |
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196 rs.release(); |
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197 return false; |
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198 } |
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199 assert(_virtual_space.committed_size() == rs.size(), |
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200 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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201 _base = (oop*) _virtual_space.low(); |
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202 setEmpty(); |
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203 _capacity = (jint) capacity; |
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204 _saved_index = -1; |
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205 _should_expand = false; |
342 | 206 NOT_PRODUCT(_max_depth = 0); |
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207 return true; |
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208 } |
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209 |
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210 void CMMarkStack::expand() { |
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211 // Called, during remark, if we've overflown the marking stack during marking. |
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212 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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213 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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214 // Clear expansion flag |
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215 _should_expand = false; |
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216 if (_capacity == (jint) MarkStackSizeMax) { |
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217 if (PrintGCDetails && Verbose) { |
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218 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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219 } |
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220 return; |
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221 } |
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222 // Double capacity if possible |
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223 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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224 // Do not give up existing stack until we have managed to |
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225 // get the double capacity that we desired. |
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226 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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227 sizeof(oop))); |
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228 if (rs.is_reserved()) { |
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229 // Release the backing store associated with old stack |
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230 _virtual_space.release(); |
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231 // Reinitialize virtual space for new stack |
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232 if (!_virtual_space.initialize(rs, rs.size())) { |
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233 fatal("Not enough swap for expanded marking stack capacity"); |
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234 } |
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235 _base = (oop*)(_virtual_space.low()); |
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236 _index = 0; |
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237 _capacity = new_capacity; |
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238 } else { |
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239 if (PrintGCDetails && Verbose) { |
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240 // Failed to double capacity, continue; |
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241 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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242 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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243 _capacity / K, new_capacity / K); |
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244 } |
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245 } |
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246 } |
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247 |
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248 void CMMarkStack::set_should_expand() { |
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249 // If we're resetting the marking state because of an |
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250 // marking stack overflow, record that we should, if |
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251 // possible, expand the stack. |
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252 _should_expand = _cm->has_overflown(); |
342 | 253 } |
254 | |
255 CMMarkStack::~CMMarkStack() { | |
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256 if (_base != NULL) { |
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257 _base = NULL; |
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258 _virtual_space.release(); |
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259 } |
342 | 260 } |
261 | |
262 void CMMarkStack::par_push(oop ptr) { | |
263 while (true) { | |
264 if (isFull()) { | |
265 _overflow = true; | |
266 return; | |
267 } | |
268 // Otherwise... | |
269 jint index = _index; | |
270 jint next_index = index+1; | |
271 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
272 if (res == index) { | |
273 _base[index] = ptr; | |
274 // Note that we don't maintain this atomically. We could, but it | |
275 // doesn't seem necessary. | |
276 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
277 return; | |
278 } | |
279 // Otherwise, we need to try again. | |
280 } | |
281 } | |
282 | |
283 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
284 while (true) { | |
285 if (isFull()) { | |
286 _overflow = true; | |
287 return; | |
288 } | |
289 // Otherwise... | |
290 jint index = _index; | |
291 jint next_index = index + n; | |
292 if (next_index > _capacity) { | |
293 _overflow = true; | |
294 return; | |
295 } | |
296 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
297 if (res == index) { | |
298 for (int i = 0; i < n; i++) { | |
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299 int ind = index + i; |
342 | 300 assert(ind < _capacity, "By overflow test above."); |
301 _base[ind] = ptr_arr[i]; | |
302 } | |
303 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
304 return; | |
305 } | |
306 // Otherwise, we need to try again. | |
307 } | |
308 } | |
309 | |
310 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
311 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
312 jint start = _index; | |
313 jint next_index = start + n; | |
314 if (next_index > _capacity) { | |
315 _overflow = true; | |
316 return; | |
317 } | |
318 // Otherwise. | |
319 _index = next_index; | |
320 for (int i = 0; i < n; i++) { | |
321 int ind = start + i; | |
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322 assert(ind < _capacity, "By overflow test above."); |
342 | 323 _base[ind] = ptr_arr[i]; |
324 } | |
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325 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 326 } |
327 | |
328 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
329 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
330 jint index = _index; | |
331 if (index == 0) { | |
332 *n = 0; | |
333 return false; | |
334 } else { | |
335 int k = MIN2(max, index); | |
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336 jint new_ind = index - k; |
342 | 337 for (int j = 0; j < k; j++) { |
338 ptr_arr[j] = _base[new_ind + j]; | |
339 } | |
340 _index = new_ind; | |
341 *n = k; | |
342 return true; | |
343 } | |
344 } | |
345 | |
346 template<class OopClosureClass> | |
347 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
348 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
349 || SafepointSynchronize::is_at_safepoint(), | |
350 "Drain recursion must be yield-safe."); | |
351 bool res = true; | |
352 debug_only(_drain_in_progress = true); | |
353 debug_only(_drain_in_progress_yields = yield_after); | |
354 while (!isEmpty()) { | |
355 oop newOop = pop(); | |
356 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
357 assert(newOop->is_oop(), "Expected an oop"); | |
358 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
359 "only grey objects on this stack"); | |
360 newOop->oop_iterate(cl); | |
361 if (yield_after && _cm->do_yield_check()) { | |
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362 res = false; |
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363 break; |
342 | 364 } |
365 } | |
366 debug_only(_drain_in_progress = false); | |
367 return res; | |
368 } | |
369 | |
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370 void CMMarkStack::note_start_of_gc() { |
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371 assert(_saved_index == -1, |
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372 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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373 _saved_index = _index; |
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374 } |
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375 |
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376 void CMMarkStack::note_end_of_gc() { |
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377 // This is intentionally a guarantee, instead of an assert. If we |
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378 // accidentally add something to the mark stack during GC, it |
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379 // will be a correctness issue so it's better if we crash. we'll |
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380 // only check this once per GC anyway, so it won't be a performance |
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381 // issue in any way. |
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382 guarantee(_saved_index == _index, |
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383 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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384 _saved_index = -1; |
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385 } |
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386 |
342 | 387 void CMMarkStack::oops_do(OopClosure* f) { |
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388 assert(_saved_index == _index, |
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389 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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390 for (int i = 0; i < _index; i += 1) { |
342 | 391 f->do_oop(&_base[i]); |
392 } | |
393 } | |
394 | |
395 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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396 return _g1h->is_obj_ill(obj); |
342 | 397 } |
398 | |
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399 CMRootRegions::CMRootRegions() : |
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400 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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401 _should_abort(false), _next_survivor(NULL) { } |
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402 |
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403 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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404 _young_list = g1h->young_list(); |
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405 _cm = cm; |
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406 } |
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407 |
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408 void CMRootRegions::prepare_for_scan() { |
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409 assert(!scan_in_progress(), "pre-condition"); |
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410 |
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411 // Currently, only survivors can be root regions. |
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412 assert(_next_survivor == NULL, "pre-condition"); |
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413 _next_survivor = _young_list->first_survivor_region(); |
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414 _scan_in_progress = (_next_survivor != NULL); |
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415 _should_abort = false; |
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416 } |
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417 |
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418 HeapRegion* CMRootRegions::claim_next() { |
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419 if (_should_abort) { |
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420 // If someone has set the should_abort flag, we return NULL to |
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421 // force the caller to bail out of their loop. |
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422 return NULL; |
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423 } |
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424 |
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425 // Currently, only survivors can be root regions. |
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426 HeapRegion* res = _next_survivor; |
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427 if (res != NULL) { |
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428 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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429 // Read it again in case it changed while we were waiting for the lock. |
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430 res = _next_survivor; |
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431 if (res != NULL) { |
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432 if (res == _young_list->last_survivor_region()) { |
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433 // We just claimed the last survivor so store NULL to indicate |
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434 // that we're done. |
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435 _next_survivor = NULL; |
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436 } else { |
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437 _next_survivor = res->get_next_young_region(); |
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438 } |
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439 } else { |
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440 // Someone else claimed the last survivor while we were trying |
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441 // to take the lock so nothing else to do. |
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442 } |
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443 } |
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444 assert(res == NULL || res->is_survivor(), "post-condition"); |
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445 |
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446 return res; |
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447 } |
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448 |
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449 void CMRootRegions::scan_finished() { |
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450 assert(scan_in_progress(), "pre-condition"); |
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451 |
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452 // Currently, only survivors can be root regions. |
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453 if (!_should_abort) { |
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454 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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455 } |
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456 _next_survivor = NULL; |
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457 |
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458 { |
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459 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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460 _scan_in_progress = false; |
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461 RootRegionScan_lock->notify_all(); |
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462 } |
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463 } |
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464 |
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465 bool CMRootRegions::wait_until_scan_finished() { |
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466 if (!scan_in_progress()) return false; |
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467 |
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468 { |
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469 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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470 while (scan_in_progress()) { |
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471 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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472 } |
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|
473 } |
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|
474 return true; |
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|
475 } |
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476 |
342 | 477 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
478 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
479 #endif // _MSC_VER | |
480 | |
4728
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7121618: Change type of number of GC workers to unsigned int.
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481 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
441e946dc1af
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482 return MAX2((n_par_threads + 2) / 4, 1U); |
4095
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483 } |
bca17e38de00
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484 |
7397
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485 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
442f942757c0
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|
486 _g1h(g1h), |
12229
ff218fdb30ba
8021823: G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
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diff
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487 _markBitMap1(log2_intptr(MinObjAlignment)), |
ff218fdb30ba
8021823: G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
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488 _markBitMap2(log2_intptr(MinObjAlignment)), |
342 | 489 _parallel_marking_threads(0), |
4095
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490 _max_parallel_marking_threads(0), |
342 | 491 _sleep_factor(0.0), |
492 _marking_task_overhead(1.0), | |
493 _cleanup_sleep_factor(0.0), | |
494 _cleanup_task_overhead(1.0), | |
2152 | 495 _cleanup_list("Cleanup List"), |
7397
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496 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
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497 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
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498 CardTableModRefBS::card_shift, |
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499 false /* in_resource_area*/), |
4836
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6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
500 |
342 | 501 _prevMarkBitMap(&_markBitMap1), |
502 _nextMarkBitMap(&_markBitMap2), | |
503 | |
504 _markStack(this), | |
505 // _finger set in set_non_marking_state | |
506 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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6812
diff
changeset
|
507 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 508 // _active_tasks set in set_non_marking_state |
509 // _tasks set inside the constructor | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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510 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
511 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 512 |
513 _has_overflown(false), | |
514 _concurrent(false), | |
619
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
tonyp
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470
diff
changeset
|
515 _has_aborted(false), |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
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516 _aborted_gc_id(GCId::undefined()), |
619
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
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470
diff
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|
517 _restart_for_overflow(false), |
7ea5ca260b28
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470
diff
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|
518 _concurrent_marking_in_progress(false), |
342 | 519 |
520 // _verbose_level set below | |
521 | |
522 _init_times(), | |
523 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
524 _cleanup_times(), | |
525 _total_counting_time(0.0), | |
526 _total_rs_scrub_time(0.0), | |
4836
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527 |
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|
528 _parallel_workers(NULL), |
d30fa85f9994
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|
529 |
d30fa85f9994
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|
530 _count_card_bitmaps(NULL), |
7397
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|
531 _count_marked_bytes(NULL), |
442f942757c0
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|
532 _completed_initialization(false) { |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
533 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
534 if (verbose_level < no_verbose) { |
342 | 535 verbose_level = no_verbose; |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
536 } |
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
537 if (verbose_level > high_verbose) { |
342 | 538 verbose_level = high_verbose; |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
539 } |
342 | 540 _verbose_level = verbose_level; |
541 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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|
542 if (verbose_low()) { |
342 | 543 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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17844
diff
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|
544 "heap end = " INTPTR_FORMAT, p2i(_heap_start), p2i(_heap_end)); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
545 } |
342 | 546 |
7397
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8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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547 if (!_markBitMap1.allocate(heap_rs)) { |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
548 warning("Failed to allocate first CM bit map"); |
442f942757c0
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|
549 return; |
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|
550 } |
442f942757c0
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diff
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|
551 if (!_markBitMap2.allocate(heap_rs)) { |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
552 warning("Failed to allocate second CM bit map"); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
553 return; |
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|
554 } |
342 | 555 |
556 // Create & start a ConcurrentMark thread. | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
557 _cmThread = new ConcurrentMarkThread(this); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
558 assert(cmThread() != NULL, "CM Thread should have been created"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
559 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
13437
1de8e5356754
8029326: G1 does not check if threads gets created
ehelin
parents:
12316
diff
changeset
|
560 if (_cmThread->osthread() == NULL) { |
1de8e5356754
8029326: G1 does not check if threads gets created
ehelin
parents:
12316
diff
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|
561 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
1de8e5356754
8029326: G1 does not check if threads gets created
ehelin
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|
562 } |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
563 |
342 | 564 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
7397
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|
565 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
442f942757c0
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|
566 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 567 |
568 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 569 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 570 |
4837
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571 _root_regions.init(_g1h, this); |
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572 |
1284 | 573 if (ConcGCThreads > ParallelGCThreads) { |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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|
574 warning("Can't have more ConcGCThreads (" UINTX_FORMAT ") " |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
575 "than ParallelGCThreads (" UINTX_FORMAT ").", |
7397
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8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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576 ConcGCThreads, ParallelGCThreads); |
442f942757c0
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|
577 return; |
342 | 578 } |
579 if (ParallelGCThreads == 0) { | |
580 // if we are not running with any parallel GC threads we will not | |
581 // spawn any marking threads either | |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
582 _parallel_marking_threads = 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
583 _max_parallel_marking_threads = 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
584 _sleep_factor = 0.0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4093
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|
585 _marking_task_overhead = 1.0; |
342 | 586 } else { |
8006
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
johnc
parents:
7450
diff
changeset
|
587 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
johnc
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diff
changeset
|
588 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 589 // if both are set |
590 _sleep_factor = 0.0; | |
591 _marking_task_overhead = 1.0; | |
751 | 592 } else if (G1MarkingOverheadPercent > 0) { |
8006
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
johnc
parents:
7450
diff
changeset
|
593 // We will calculate the number of parallel marking threads based |
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594 // on a target overhead with respect to the soft real-time goal |
751 | 595 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 596 double overall_cm_overhead = |
751 | 597 (double) MaxGCPauseMillis * marking_overhead / |
598 (double) GCPauseIntervalMillis; | |
342 | 599 double cpu_ratio = 1.0 / (double) os::processor_count(); |
600 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
601 double marking_task_overhead = | |
602 overall_cm_overhead / marking_thread_num * | |
603 (double) os::processor_count(); | |
604 double sleep_factor = | |
605 (1.0 - marking_task_overhead) / marking_task_overhead; | |
606 | |
8006
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607 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 608 _sleep_factor = sleep_factor; |
609 _marking_task_overhead = marking_task_overhead; | |
610 } else { | |
8006
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611 // Calculate the number of parallel marking threads by scaling |
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612 // the number of parallel GC threads. |
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613 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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614 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 615 _sleep_factor = 0.0; |
616 _marking_task_overhead = 1.0; | |
617 } | |
618 | |
8006
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619 assert(ConcGCThreads > 0, "Should have been set"); |
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620 _parallel_marking_threads = (uint) ConcGCThreads; |
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621 _max_parallel_marking_threads = _parallel_marking_threads; |
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622 |
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623 if (parallel_marking_threads() > 1) { |
342 | 624 _cleanup_task_overhead = 1.0; |
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625 } else { |
342 | 626 _cleanup_task_overhead = marking_task_overhead(); |
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627 } |
342 | 628 _cleanup_sleep_factor = |
629 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
630 | |
631 #if 0 | |
632 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
633 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
634 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
635 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
636 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
637 #endif | |
638 | |
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639 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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640 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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641 _max_parallel_marking_threads, false, true); |
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642 if (_parallel_workers == NULL) { |
342 | 643 vm_exit_during_initialization("Failed necessary allocation."); |
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644 } else { |
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645 _parallel_workers->initialize_workers(); |
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646 } |
342 | 647 } |
648 | |
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649 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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650 uintx mark_stack_size = |
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651 MIN2(MarkStackSizeMax, |
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652 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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653 // Verify that the calculated value for MarkStackSize is in range. |
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654 // It would be nice to use the private utility routine from Arguments. |
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655 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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656 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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657 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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658 mark_stack_size, (uintx) 1, MarkStackSizeMax); |
7397
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659 return; |
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660 } |
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661 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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662 } else { |
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663 // Verify MarkStackSize is in range. |
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664 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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665 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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666 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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667 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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668 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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669 MarkStackSize, (uintx) 1, MarkStackSizeMax); |
7397
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670 return; |
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671 } |
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672 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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673 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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674 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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675 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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676 MarkStackSize, MarkStackSizeMax); |
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677 return; |
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678 } |
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679 } |
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680 } |
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681 } |
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682 |
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683 if (!_markStack.allocate(MarkStackSize)) { |
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684 warning("Failed to allocate CM marking stack"); |
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685 return; |
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686 } |
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687 |
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688 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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689 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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690 |
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691 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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692 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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693 |
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694 BitMap::idx_t card_bm_size = _card_bm.size(); |
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695 |
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696 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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697 _active_tasks = _max_worker_id; |
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698 |
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699 size_t max_regions = (size_t) _g1h->max_regions(); |
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700 for (uint i = 0; i < _max_worker_id; ++i) { |
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701 CMTaskQueue* task_queue = new CMTaskQueue(); |
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702 task_queue->initialize(); |
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703 _task_queues->register_queue(i, task_queue); |
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704 |
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705 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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706 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
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707 |
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708 _tasks[i] = new CMTask(i, this, |
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709 _count_marked_bytes[i], |
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710 &_count_card_bitmaps[i], |
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711 task_queue, _task_queues); |
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712 |
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713 _accum_task_vtime[i] = 0.0; |
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714 } |
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715 |
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716 // Calculate the card number for the bottom of the heap. Used |
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717 // in biasing indexes into the accounting card bitmaps. |
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718 _heap_bottom_card_num = |
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719 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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720 CardTableModRefBS::card_shift); |
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721 |
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722 // Clear all the liveness counting data |
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723 clear_all_count_data(); |
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724 |
342 | 725 // so that the call below can read a sensible value |
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726 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 727 set_non_marking_state(); |
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728 _completed_initialization = true; |
342 | 729 } |
730 | |
731 void ConcurrentMark::update_g1_committed(bool force) { | |
732 // If concurrent marking is not in progress, then we do not need to | |
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733 // update _heap_end. |
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734 if (!concurrent_marking_in_progress() && !force) return; |
342 | 735 |
736 MemRegion committed = _g1h->g1_committed(); | |
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737 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 738 HeapWord* new_end = committed.end(); |
739 if (new_end > _heap_end) { | |
740 // The heap has been expanded. | |
741 | |
742 _heap_end = new_end; | |
743 } | |
744 // Notice that the heap can also shrink. However, this only happens | |
745 // during a Full GC (at least currently) and the entire marking | |
746 // phase will bail out and the task will not be restarted. So, let's | |
747 // do nothing. | |
748 } | |
749 | |
750 void ConcurrentMark::reset() { | |
751 // Starting values for these two. This should be called in a STW | |
752 // phase. CM will be notified of any future g1_committed expansions | |
753 // will be at the end of evacuation pauses, when tasks are | |
754 // inactive. | |
755 MemRegion committed = _g1h->g1_committed(); | |
756 _heap_start = committed.start(); | |
757 _heap_end = committed.end(); | |
758 | |
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759 // Separated the asserts so that we know which one fires. |
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760 assert(_heap_start != NULL, "heap bounds should look ok"); |
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761 assert(_heap_end != NULL, "heap bounds should look ok"); |
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762 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 763 |
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764 // Reset all the marking data structures and any necessary flags |
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765 reset_marking_state(); |
342 | 766 |
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767 if (verbose_low()) { |
342 | 768 gclog_or_tty->print_cr("[global] resetting"); |
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769 } |
342 | 770 |
771 // We do reset all of them, since different phases will use | |
772 // different number of active threads. So, it's easiest to have all | |
773 // of them ready. | |
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774 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 775 _tasks[i]->reset(_nextMarkBitMap); |
1835
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776 } |
342 | 777 |
778 // we need this to make sure that the flag is on during the evac | |
779 // pause with initial mark piggy-backed | |
780 set_concurrent_marking_in_progress(); | |
781 } | |
782 | |
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783 |
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784 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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785 _markStack.set_should_expand(); |
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786 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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787 if (clear_overflow) { |
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788 clear_has_overflown(); |
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789 } else { |
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790 assert(has_overflown(), "pre-condition"); |
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791 } |
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792 _finger = _heap_start; |
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793 |
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794 for (uint i = 0; i < _max_worker_id; ++i) { |
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795 CMTaskQueue* queue = _task_queues->queue(i); |
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796 queue->set_empty(); |
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797 } |
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798 } |
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799 |
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800 void ConcurrentMark::set_concurrency(uint active_tasks) { |
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801 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 802 |
803 _active_tasks = active_tasks; | |
804 // Need to update the three data structures below according to the | |
805 // number of active threads for this phase. | |
806 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
807 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
808 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
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809 } |
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810 |
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811 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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812 set_concurrency(active_tasks); |
342 | 813 |
814 _concurrent = concurrent; | |
815 // We propagate this to all tasks, not just the active ones. | |
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816 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 817 _tasks[i]->set_concurrent(concurrent); |
818 | |
819 if (concurrent) { | |
820 set_concurrent_marking_in_progress(); | |
821 } else { | |
822 // We currently assume that the concurrent flag has been set to | |
823 // false before we start remark. At this point we should also be | |
824 // in a STW phase. | |
1023
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825 assert(!concurrent_marking_in_progress(), "invariant"); |
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826 assert(out_of_regions(), |
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827 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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828 p2i(_finger), p2i(_heap_end))); |
342 | 829 update_g1_committed(true); |
830 } | |
831 } | |
832 | |
833 void ConcurrentMark::set_non_marking_state() { | |
834 // We set the global marking state to some default values when we're | |
835 // not doing marking. | |
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836 reset_marking_state(); |
342 | 837 _active_tasks = 0; |
838 clear_concurrent_marking_in_progress(); | |
839 } | |
840 | |
841 ConcurrentMark::~ConcurrentMark() { | |
4735 | 842 // The ConcurrentMark instance is never freed. |
843 ShouldNotReachHere(); | |
342 | 844 } |
845 | |
846 void ConcurrentMark::clearNextBitmap() { | |
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847 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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848 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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849 |
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850 // Make sure that the concurrent mark thread looks to still be in |
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851 // the current cycle. |
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852 guarantee(cmThread()->during_cycle(), "invariant"); |
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853 |
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854 // We are finishing up the current cycle by clearing the next |
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855 // marking bitmap and getting it ready for the next cycle. During |
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856 // this time no other cycle can start. So, let's make sure that this |
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857 // is the case. |
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858 guarantee(!g1h->mark_in_progress(), "invariant"); |
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859 |
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860 // clear the mark bitmap (no grey objects to start with). |
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861 // We need to do this in chunks and offer to yield in between |
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862 // each chunk. |
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863 HeapWord* start = _nextMarkBitMap->startWord(); |
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864 HeapWord* end = _nextMarkBitMap->endWord(); |
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865 HeapWord* cur = start; |
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866 size_t chunkSize = M; |
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867 while (cur < end) { |
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868 HeapWord* next = cur + chunkSize; |
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869 if (next > end) { |
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870 next = end; |
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871 } |
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872 MemRegion mr(cur,next); |
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873 _nextMarkBitMap->clearRange(mr); |
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874 cur = next; |
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875 do_yield_check(); |
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876 |
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877 // Repeat the asserts from above. We'll do them as asserts here to |
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878 // minimize their overhead on the product. However, we'll have |
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879 // them as guarantees at the beginning / end of the bitmap |
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880 // clearing to get some checking in the product. |
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881 assert(cmThread()->during_cycle(), "invariant"); |
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882 assert(!g1h->mark_in_progress(), "invariant"); |
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883 } |
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884 |
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885 // Clear the liveness counting data |
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886 clear_all_count_data(); |
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887 |
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888 // Repeat the asserts from above. |
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889 guarantee(cmThread()->during_cycle(), "invariant"); |
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890 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 891 } |
892 | |
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893 bool ConcurrentMark::nextMarkBitmapIsClear() { |
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894 return _nextMarkBitMap->getNextMarkedWordAddress(_heap_start, _heap_end) == _heap_end; |
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895 } |
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896 |
342 | 897 class NoteStartOfMarkHRClosure: public HeapRegionClosure { |
898 public: | |
899 bool doHeapRegion(HeapRegion* r) { | |
900 if (!r->continuesHumongous()) { | |
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901 r->note_start_of_marking(); |
342 | 902 } |
903 return false; | |
904 } | |
905 }; | |
906 | |
907 void ConcurrentMark::checkpointRootsInitialPre() { | |
908 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
909 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
910 | |
911 _has_aborted = false; | |
912 | |
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913 #ifndef PRODUCT |
1044 | 914 if (G1PrintReachableAtInitialMark) { |
1388 | 915 print_reachable("at-cycle-start", |
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916 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 917 } |
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918 #endif |
342 | 919 |
920 // Initialise marking structures. This has to be done in a STW phase. | |
921 reset(); | |
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922 |
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923 // For each region note start of marking. |
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924 NoteStartOfMarkHRClosure startcl; |
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925 g1h->heap_region_iterate(&startcl); |
342 | 926 } |
927 | |
928 | |
929 void ConcurrentMark::checkpointRootsInitialPost() { | |
930 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
931 | |
3316
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932 // If we force an overflow during remark, the remark operation will |
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933 // actually abort and we'll restart concurrent marking. If we always |
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934 // force an oveflow during remark we'll never actually complete the |
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935 // marking phase. So, we initilize this here, at the start of the |
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936 // cycle, so that at the remaining overflow number will decrease at |
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937 // every remark and we'll eventually not need to cause one. |
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938 force_overflow_stw()->init(); |
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939 |
3979
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940 // Start Concurrent Marking weak-reference discovery. |
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941 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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942 // enable ("weak") refs discovery |
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943 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
457
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944 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 945 |
946 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
1317
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947 // This is the start of the marking cycle, we're expected all |
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948 // threads to have SATB queues with active set to false. |
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949 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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950 false /* expected_active */); |
342 | 951 |
4837
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952 _root_regions.prepare_for_scan(); |
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953 |
342 | 954 // update_g1_committed() will be called at the end of an evac pause |
955 // when marking is on. So, it's also called at the end of the | |
956 // initial-mark pause to update the heap end, if the heap expands | |
957 // during it. No need to call it here. | |
958 } | |
959 | |
960 /* | |
3316
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961 * Notice that in the next two methods, we actually leave the STS |
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962 * during the barrier sync and join it immediately afterwards. If we |
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963 * do not do this, the following deadlock can occur: one thread could |
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964 * be in the barrier sync code, waiting for the other thread to also |
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965 * sync up, whereas another one could be trying to yield, while also |
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966 * waiting for the other threads to sync up too. |
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967 * |
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968 * Note, however, that this code is also used during remark and in |
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969 * this case we should not attempt to leave / enter the STS, otherwise |
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970 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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971 * (product). So we should only leave / enter the STS if we are |
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972 * operating concurrently. |
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973 * |
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974 * Because the thread that does the sync barrier has left the STS, it |
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975 * is possible to be suspended for a Full GC or an evacuation pause |
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976 * could occur. This is actually safe, since the entering the sync |
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977 * barrier is one of the last things do_marking_step() does, and it |
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978 * doesn't manipulate any data structures afterwards. |
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979 */ |
342 | 980 |
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981 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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982 if (verbose_low()) { |
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983 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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984 } |
342 | 985 |
3316
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986 if (concurrent()) { |
20192 | 987 SuspendibleThreadSet::leave(); |
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988 } |
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989 |
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990 bool barrier_aborted = !_first_overflow_barrier_sync.enter(); |
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991 |
3316
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992 if (concurrent()) { |
20192 | 993 SuspendibleThreadSet::join(); |
3316
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994 } |
342 | 995 // at this point everyone should have synced up and not be doing any |
996 // more work | |
997 | |
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998 if (verbose_low()) { |
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999 if (barrier_aborted) { |
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1000 gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id); |
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1001 } else { |
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1002 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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1003 } |
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1004 } |
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1005 |
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1006 if (barrier_aborted) { |
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1007 // If the barrier aborted we ignore the overflow condition and |
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1008 // just abort the whole marking phase as quickly as possible. |
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1009 return; |
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1010 } |
342 | 1011 |
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1012 // If we're executing the concurrent phase of marking, reset the marking |
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1013 // state; otherwise the marking state is reset after reference processing, |
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1014 // during the remark pause. |
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1015 // If we reset here as a result of an overflow during the remark we will |
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1016 // see assertion failures from any subsequent set_concurrency_and_phase() |
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1017 // calls. |
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1018 if (concurrent()) { |
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1019 // let the task associated with with worker 0 do this |
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1020 if (worker_id == 0) { |
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1021 // task 0 is responsible for clearing the global data structures |
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1022 // We should be here because of an overflow. During STW we should |
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1023 // not clear the overflow flag since we rely on it being true when |
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1024 // we exit this method to abort the pause and restart concurent |
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1025 // marking. |
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1026 reset_marking_state(true /* clear_overflow */); |
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1027 force_overflow()->update(); |
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1028 |
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1029 if (G1Log::fine()) { |
20190
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1030 gclog_or_tty->gclog_stamp(concurrent_gc_id()); |
8788
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1031 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1032 } |
342 | 1033 } |
1034 } | |
1035 | |
1036 // after this, each task should reset its own data structures then | |
1037 // then go into the second barrier | |
1038 } | |
1039 | |
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1040 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1041 if (verbose_low()) { |
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1042 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1043 } |
342 | 1044 |
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1045 if (concurrent()) { |
20192 | 1046 SuspendibleThreadSet::leave(); |
3316
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1047 } |
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1048 |
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1049 bool barrier_aborted = !_second_overflow_barrier_sync.enter(); |
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1050 |
3316
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1051 if (concurrent()) { |
20192 | 1052 SuspendibleThreadSet::join(); |
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1053 } |
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1054 // at this point everything should be re-initialized and ready to go |
342 | 1055 |
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1056 if (verbose_low()) { |
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1057 if (barrier_aborted) { |
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1058 gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id); |
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1059 } else { |
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1060 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1061 } |
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1062 } |
342 | 1063 } |
1064 | |
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1065 #ifndef PRODUCT |
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1066 void ForceOverflowSettings::init() { |
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1067 _num_remaining = G1ConcMarkForceOverflow; |
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1068 _force = false; |
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1069 update(); |
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1070 } |
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1071 |
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1072 void ForceOverflowSettings::update() { |
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1073 if (_num_remaining > 0) { |
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1074 _num_remaining -= 1; |
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1075 _force = true; |
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1076 } else { |
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1077 _force = false; |
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1078 } |
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1079 } |
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1080 |
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1081 bool ForceOverflowSettings::should_force() { |
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1082 if (_force) { |
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1083 _force = false; |
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1084 return true; |
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1085 } else { |
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1086 return false; |
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1087 } |
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1088 } |
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1089 #endif // !PRODUCT |
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1090 |
342 | 1091 class CMConcurrentMarkingTask: public AbstractGangTask { |
1092 private: | |
1093 ConcurrentMark* _cm; | |
1094 ConcurrentMarkThread* _cmt; | |
1095 | |
1096 public: | |
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1097 void work(uint worker_id) { |
1023
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1098 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1099 "this should only be done by a conc GC thread"); |
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1100 ResourceMark rm; |
342 | 1101 |
1102 double start_vtime = os::elapsedVTime(); | |
1103 | |
20192 | 1104 SuspendibleThreadSet::join(); |
342 | 1105 |
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1106 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1107 CMTask* the_task = _cm->task(worker_id); |
342 | 1108 the_task->record_start_time(); |
1109 if (!_cm->has_aborted()) { | |
1110 do { | |
1111 double start_vtime_sec = os::elapsedVTime(); | |
1112 double start_time_sec = os::elapsedTime(); | |
2174
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1113 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1114 |
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1115 the_task->do_marking_step(mark_step_duration_ms, |
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1116 true /* do_termination */, |
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1117 false /* is_serial*/); |
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1118 |
342 | 1119 double end_time_sec = os::elapsedTime(); |
1120 double end_vtime_sec = os::elapsedVTime(); | |
1121 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1122 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1123 _cm->clear_has_overflown(); | |
1124 | |
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1125 bool ret = _cm->do_yield_check(worker_id); |
342 | 1126 |
1127 jlong sleep_time_ms; | |
1128 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1129 sleep_time_ms = | |
1130 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
20192 | 1131 SuspendibleThreadSet::leave(); |
342 | 1132 os::sleep(Thread::current(), sleep_time_ms, false); |
20192 | 1133 SuspendibleThreadSet::join(); |
342 | 1134 } |
1135 double end_time2_sec = os::elapsedTime(); | |
1136 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1137 | |
1138 #if 0 | |
1139 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1140 "overhead %1.4lf", | |
1141 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1142 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1143 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1144 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1145 #endif | |
1146 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1147 } | |
1148 the_task->record_end_time(); | |
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1149 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1150 |
20192 | 1151 SuspendibleThreadSet::leave(); |
342 | 1152 |
1153 double end_vtime = os::elapsedVTime(); | |
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1154 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1155 } |
1156 | |
1157 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1158 ConcurrentMarkThread* cmt) : | |
1159 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1160 | |
1161 ~CMConcurrentMarkingTask() { } | |
1162 }; | |
1163 | |
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1164 // Calculates the number of active workers for a concurrent |
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1165 // phase. |
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1166 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1167 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1168 uint n_conc_workers = 0; |
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1169 if (!UseDynamicNumberOfGCThreads || |
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1170 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1171 !ForceDynamicNumberOfGCThreads)) { |
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1172 n_conc_workers = max_parallel_marking_threads(); |
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1173 } else { |
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1174 n_conc_workers = |
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1175 AdaptiveSizePolicy::calc_default_active_workers( |
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1176 max_parallel_marking_threads(), |
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1177 1, /* Minimum workers */ |
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1178 parallel_marking_threads(), |
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1179 Threads::number_of_non_daemon_threads()); |
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1180 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1181 // that scaling has already gone into "_max_parallel_marking_threads". |
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1182 } |
4711 | 1183 assert(n_conc_workers > 0, "Always need at least 1"); |
1184 return n_conc_workers; | |
4095
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1185 } |
4711 | 1186 // If we are not running with any parallel GC threads we will not |
1187 // have spawned any marking threads either. Hence the number of | |
1188 // concurrent workers should be 0. | |
1189 return 0; | |
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1190 } |
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1191 |
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1192 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1193 // Currently, only survivors can be root regions. |
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1194 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1195 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1196 |
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1197 const uintx interval = PrefetchScanIntervalInBytes; |
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1198 HeapWord* curr = hr->bottom(); |
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1199 const HeapWord* end = hr->top(); |
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1200 while (curr < end) { |
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1201 Prefetch::read(curr, interval); |
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1202 oop obj = oop(curr); |
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1203 int size = obj->oop_iterate(&cl); |
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1204 assert(size == obj->size(), "sanity"); |
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1205 curr += size; |
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1206 } |
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1207 } |
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1208 |
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1209 class CMRootRegionScanTask : public AbstractGangTask { |
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1210 private: |
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1211 ConcurrentMark* _cm; |
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1212 |
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1213 public: |
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1214 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1215 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1216 |
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1217 void work(uint worker_id) { |
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1218 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1219 "this should only be done by a conc GC thread"); |
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1220 |
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1221 CMRootRegions* root_regions = _cm->root_regions(); |
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1222 HeapRegion* hr = root_regions->claim_next(); |
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1223 while (hr != NULL) { |
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1224 _cm->scanRootRegion(hr, worker_id); |
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1225 hr = root_regions->claim_next(); |
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1226 } |
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1227 } |
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1228 }; |
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1229 |
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1230 void ConcurrentMark::scanRootRegions() { |
20278
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1231 // Start of concurrent marking. |
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1232 ClassLoaderDataGraph::clear_claimed_marks(); |
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1233 |
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1234 // scan_in_progress() will have been set to true only if there was |
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1235 // at least one root region to scan. So, if it's false, we |
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1236 // should not attempt to do any further work. |
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1237 if (root_regions()->scan_in_progress()) { |
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1238 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1239 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1240 "Maximum number of marking threads exceeded"); |
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1241 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1242 |
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1243 CMRootRegionScanTask task(this); |
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1244 if (use_parallel_marking_threads()) { |
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1245 _parallel_workers->set_active_workers((int) active_workers); |
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1246 _parallel_workers->run_task(&task); |
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1247 } else { |
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1248 task.work(0); |
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1249 } |
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1250 |
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1251 // It's possible that has_aborted() is true here without actually |
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1252 // aborting the survivor scan earlier. This is OK as it's |
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1253 // mainly used for sanity checking. |
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1254 root_regions()->scan_finished(); |
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1255 } |
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1256 } |
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1257 |
342 | 1258 void ConcurrentMark::markFromRoots() { |
1259 // we might be tempted to assert that: | |
1260 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1261 // "inconsistent argument?"); | |
1262 // However that wouldn't be right, because it's possible that | |
1263 // a safepoint is indeed in progress as a younger generation | |
1264 // stop-the-world GC happens even as we mark in this generation. | |
1265 | |
1266 _restart_for_overflow = false; | |
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1267 force_overflow_conc()->init(); |
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1268 |
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1269 // _g1h has _n_par_threads |
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1270 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1271 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1272 "Maximum number of marking threads exceeded"); |
4711 | 1273 |
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1274 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1275 |
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1276 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1277 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1278 |
1279 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1280 if (use_parallel_marking_threads()) { |
4711 | 1281 _parallel_workers->set_active_workers((int)active_workers); |
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1282 // Don't set _n_par_threads because it affects MT in process_roots() |
4711 | 1283 // and the decisions on that MT processing is made elsewhere. |
1284 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1285 _parallel_workers->run_task(&markingTask); |
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1286 } else { |
342 | 1287 markingTask.work(0); |
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1288 } |
342 | 1289 print_stats(); |
1290 } | |
1291 | |
1292 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1293 // world is stopped at this checkpoint | |
1294 assert(SafepointSynchronize::is_at_safepoint(), | |
1295 "world should be stopped"); | |
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1296 |
342 | 1297 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1298 | |
1299 // If a full collection has happened, we shouldn't do this. | |
1300 if (has_aborted()) { | |
1301 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1302 return; | |
1303 } | |
1304 | |
2125
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1305 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1306 |
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1307 if (VerifyDuringGC) { |
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1308 HandleMark hm; // handle scope |
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1309 Universe::heap()->prepare_for_verify(); |
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1310 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1311 " VerifyDuringGC:(before)"); |
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1312 } |
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1313 |
342 | 1314 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1315 g1p->record_concurrent_mark_remark_start(); | |
1316 | |
1317 double start = os::elapsedTime(); | |
1318 | |
1319 checkpointRootsFinalWork(); | |
1320 | |
1321 double mark_work_end = os::elapsedTime(); | |
1322 | |
1323 weakRefsWork(clear_all_soft_refs); | |
1324 | |
1325 if (has_overflown()) { | |
1326 // Oops. We overflowed. Restart concurrent marking. | |
1327 _restart_for_overflow = true; | |
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1328 if (G1TraceMarkStackOverflow) { |
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1329 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1330 } |
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1331 |
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1332 // Verify the heap w.r.t. the previous marking bitmap. |
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1333 if (VerifyDuringGC) { |
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1334 HandleMark hm; // handle scope |
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1335 Universe::heap()->prepare_for_verify(); |
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1336 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1337 " VerifyDuringGC:(overflow)"); |
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1338 } |
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1339 |
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1340 // Clear the marking state because we will be restarting |
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1341 // marking due to overflowing the global mark stack. |
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1342 reset_marking_state(); |
342 | 1343 } else { |
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1344 // Aggregate the per-task counting data that we have accumulated |
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1345 // while marking. |
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1346 aggregate_count_data(); |
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1347 |
2149 | 1348 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1349 // We're done with marking. |
1317
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1350 // This is the end of the marking cycle, we're expected all |
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1351 // threads to have SATB queues with active set to true. |
2149 | 1352 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1353 true /* expected_active */); | |
811 | 1354 |
1355 if (VerifyDuringGC) { | |
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1356 HandleMark hm; // handle scope |
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1357 Universe::heap()->prepare_for_verify(); |
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1358 Universe::verify(VerifyOption_G1UseNextMarking, |
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1359 " VerifyDuringGC:(after)"); |
811 | 1360 } |
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1361 assert(!restart_for_overflow(), "sanity"); |
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1362 // Completely reset the marking state since marking completed |
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1363 set_non_marking_state(); |
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1364 } |
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1365 |
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1366 // Expand the marking stack, if we have to and if we can. |
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1367 if (_markStack.should_expand()) { |
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1368 _markStack.expand(); |
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1369 } |
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1370 |
342 | 1371 // Statistics |
1372 double now = os::elapsedTime(); | |
1373 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1374 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1375 _remark_times.add((now - start) * 1000.0); | |
1376 | |
1377 g1p->record_concurrent_mark_remark_end(); | |
10405 | 1378 |
1379 G1CMIsAliveClosure is_alive(g1h); | |
1380 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
342 | 1381 } |
1382 | |
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1383 // Base class of the closures that finalize and verify the |
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1384 // liveness counting data. |
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1385 class CMCountDataClosureBase: public HeapRegionClosure { |
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1386 protected: |
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1387 G1CollectedHeap* _g1h; |
342 | 1388 ConcurrentMark* _cm; |
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1389 CardTableModRefBS* _ct_bs; |
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1390 |
342 | 1391 BitMap* _region_bm; |
1392 BitMap* _card_bm; | |
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1393 |
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1394 // Takes a region that's not empty (i.e., it has at least one |
829 | 1395 // live object in it and sets its corresponding bit on the region |
1396 // bitmap to 1. If the region is "starts humongous" it will also set | |
1397 // to 1 the bits on the region bitmap that correspond to its | |
1398 // associated "continues humongous" regions. | |
1399 void set_bit_for_region(HeapRegion* hr) { | |
1400 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1401 | |
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1402 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1403 if (!hr->startsHumongous()) { |
1404 // Normal (non-humongous) case: just set the bit. | |
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1405 _region_bm->par_at_put(index, true); |
829 | 1406 } else { |
1407 // Starts humongous case: calculate how many regions are part of | |
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1408 // this humongous region and then set the bit range. |
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1409 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1410 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1411 } |
1412 } | |
1413 | |
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1414 public: |
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1415 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1416 BitMap* region_bm, BitMap* card_bm): |
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1417 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1418 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1419 _region_bm(region_bm), _card_bm(card_bm) { } |
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1420 }; |
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1421 |
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1422 // Closure that calculates the # live objects per region. Used |
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1423 // for verification purposes during the cleanup pause. |
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1424 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1425 CMBitMapRO* _bm; |
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1426 size_t _region_marked_bytes; |
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1427 |
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1428 public: |
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1429 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1430 BitMap* region_bm, BitMap* card_bm) : |
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1431 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1432 _bm(bm), _region_marked_bytes(0) { } |
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1433 |
342 | 1434 bool doHeapRegion(HeapRegion* hr) { |
1435 | |
639 | 1436 if (hr->continuesHumongous()) { |
829 | 1437 // We will ignore these here and process them when their |
1438 // associated "starts humongous" region is processed (see | |
1439 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1440 // associated "starts humongous" region to have their bit set to | |
1441 // 1 since, due to the region chunking in the parallel region | |
1442 // iteration, a "continues humongous" region might be visited | |
1443 // before its associated "starts humongous". | |
639 | 1444 return false; |
1445 } | |
342 | 1446 |
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1447 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1448 HeapWord* start = hr->bottom(); |
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1449 |
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1450 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1451 err_msg("Preconditions not met - " |
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1452 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1453 p2i(start), p2i(ntams), p2i(hr->end()))); |
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1454 |
342 | 1455 // Find the first marked object at or after "start". |
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1456 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1457 |
342 | 1458 size_t marked_bytes = 0; |
1459 | |
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1460 while (start < ntams) { |
342 | 1461 oop obj = oop(start); |
1462 int obj_sz = obj->size(); | |
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1463 HeapWord* obj_end = start + obj_sz; |
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1464 |
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1465 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1466 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1467 |
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1468 // Note: if we're looking at the last region in heap - obj_end |
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1469 // could be actually just beyond the end of the heap; end_idx |
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1470 // will then correspond to a (non-existent) card that is also |
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1471 // just beyond the heap. |
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1472 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1473 // end of object is not card aligned - increment to cover |
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1474 // all the cards spanned by the object |
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1475 end_idx += 1; |
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1476 } |
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1477 |
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1478 // Set the bits in the card BM for the cards spanned by this object. |
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1479 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1480 |
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1481 // Add the size of this object to the number of marked bytes. |
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1482 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1483 |
342 | 1484 // Find the next marked object after this one. |
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1485 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1486 } |
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1487 |
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1488 // Mark the allocated-since-marking portion... |
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1489 HeapWord* top = hr->top(); |
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1490 if (ntams < top) { |
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1491 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1492 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1493 |
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1494 // Note: if we're looking at the last region in heap - top |
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1495 // could be actually just beyond the end of the heap; end_idx |
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1496 // will then correspond to a (non-existent) card that is also |
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1497 // just beyond the heap. |
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1498 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1499 // end of object is not card aligned - increment to cover |
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1500 // all the cards spanned by the object |
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1501 end_idx += 1; |
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1502 } |
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1503 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1504 |
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1505 // This definitely means the region has live objects. |
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1506 set_bit_for_region(hr); |
342 | 1507 } |
1508 | |
1509 // Update the live region bitmap. | |
1510 if (marked_bytes > 0) { | |
829 | 1511 set_bit_for_region(hr); |
342 | 1512 } |
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1513 |
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1514 // Set the marked bytes for the current region so that |
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1515 // it can be queried by a calling verificiation routine |
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1516 _region_marked_bytes = marked_bytes; |
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1517 |
342 | 1518 return false; |
1519 } | |
1520 | |
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1521 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1522 }; |
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1523 |
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1524 // Heap region closure used for verifying the counting data |
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1525 // that was accumulated concurrently and aggregated during |
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1526 // the remark pause. This closure is applied to the heap |
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1527 // regions during the STW cleanup pause. |
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1528 |
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1529 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1530 G1CollectedHeap* _g1h; |
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1531 ConcurrentMark* _cm; |
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1532 CalcLiveObjectsClosure _calc_cl; |
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1533 BitMap* _region_bm; // Region BM to be verified |
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1534 BitMap* _card_bm; // Card BM to be verified |
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1535 bool _verbose; // verbose output? |
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1536 |
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1537 BitMap* _exp_region_bm; // Expected Region BM values |
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1538 BitMap* _exp_card_bm; // Expected card BM values |
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1539 |
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1540 int _failures; |
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1541 |
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1542 public: |
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1543 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1544 BitMap* region_bm, |
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1545 BitMap* card_bm, |
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1546 BitMap* exp_region_bm, |
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1547 BitMap* exp_card_bm, |
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1548 bool verbose) : |
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1549 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1550 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1551 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1552 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1553 _failures(0) { } |
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1554 |
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1555 int failures() const { return _failures; } |
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1556 |
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1557 bool doHeapRegion(HeapRegion* hr) { |
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1558 if (hr->continuesHumongous()) { |
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1559 // We will ignore these here and process them when their |
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1560 // associated "starts humongous" region is processed (see |
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1561 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1562 // associated "starts humongous" region to have their bit set to |
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1563 // 1 since, due to the region chunking in the parallel region |
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1564 // iteration, a "continues humongous" region might be visited |
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1565 // before its associated "starts humongous". |
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1566 return false; |
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1567 } |
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1568 |
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1569 int failures = 0; |
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1570 |
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1571 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1572 // this region and set the corresponding bits in the expected region |
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1573 // and card bitmaps. |
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1574 bool res = _calc_cl.doHeapRegion(hr); |
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1575 assert(res == false, "should be continuing"); |
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1576 |
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1577 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1578 Mutex::_no_safepoint_check_flag); |
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1579 |
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1580 // Verify the marked bytes for this region. |
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1581 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1582 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1583 |
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1584 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1585 // we have missed accounting some objects during the actual marking. |
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1586 if (exp_marked_bytes > act_marked_bytes) { |
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1587 if (_verbose) { |
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1588 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1589 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1590 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1591 } |
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1592 failures += 1; |
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|
1593 } |
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|
1594 |
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1595 // Verify the bit, for this region, in the actual and expected |
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1596 // (which was just calculated) region bit maps. |
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1597 // We're not OK if the bit in the calculated expected region |
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1598 // bitmap is set and the bit in the actual region bitmap is not. |
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1599 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
4836
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1600 |
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1601 bool expected = _exp_region_bm->at(index); |
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1602 bool actual = _region_bm->at(index); |
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1603 if (expected && !actual) { |
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1604 if (_verbose) { |
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1605 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1606 "expected: %s, actual: %s", |
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1607 hr->hrs_index(), |
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1608 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1609 } |
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1610 failures += 1; |
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1611 } |
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|
1612 |
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1613 // Verify that the card bit maps for the cards spanned by the current |
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1614 // region match. We have an error if we have a set bit in the expected |
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1615 // bit map and the corresponding bit in the actual bitmap is not set. |
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1616 |
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1617 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1618 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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|
1619 |
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1620 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1621 expected = _exp_card_bm->at(i); |
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1622 actual = _card_bm->at(i); |
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|
1623 |
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1624 if (expected && !actual) { |
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|
1625 if (_verbose) { |
6010
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1626 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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|
1627 "expected: %s, actual: %s", |
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|
1628 hr->hrs_index(), i, |
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|
1629 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
4836
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|
1630 } |
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|
1631 failures += 1; |
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|
1632 } |
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|
1633 } |
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|
1634 |
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|
1635 if (failures > 0 && _verbose) { |
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|
1636 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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|
1637 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
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|
1638 HR_FORMAT_PARAMS(hr), p2i(hr->next_top_at_mark_start()), |
4836
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|
1639 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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|
1640 } |
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|
1641 |
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|
1642 _failures += failures; |
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|
1643 |
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|
1644 // We could stop iteration over the heap when we |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1645 // find the first violating region by returning true. |
4836
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|
1646 return false; |
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|
1647 } |
342 | 1648 }; |
1649 | |
4836
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|
1650 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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|
1651 protected: |
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|
1652 G1CollectedHeap* _g1h; |
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|
1653 ConcurrentMark* _cm; |
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|
1654 BitMap* _actual_region_bm; |
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|
1655 BitMap* _actual_card_bm; |
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|
1656 |
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|
1657 uint _n_workers; |
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|
1658 |
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|
1659 BitMap* _expected_region_bm; |
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|
1660 BitMap* _expected_card_bm; |
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|
1661 |
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|
1662 int _failures; |
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|
1663 bool _verbose; |
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|
1664 |
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|
1665 public: |
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|
1666 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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|
1667 BitMap* region_bm, BitMap* card_bm, |
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|
1668 BitMap* expected_region_bm, BitMap* expected_card_bm) |
d30fa85f9994
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|
1669 : AbstractGangTask("G1 verify final counting"), |
d30fa85f9994
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|
1670 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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|
1671 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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|
1672 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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|
1673 _failures(0), _verbose(false), |
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|
1674 _n_workers(0) { |
d30fa85f9994
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changeset
|
1675 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1676 |
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diff
changeset
|
1677 // Use the value already set as the number of active threads |
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|
1678 // in the call to run_task(). |
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|
1679 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1680 assert( _g1h->workers()->active_workers() > 0, |
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|
1681 "Should have been previously set"); |
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|
1682 _n_workers = _g1h->workers()->active_workers(); |
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|
1683 } else { |
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diff
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|
1684 _n_workers = 1; |
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diff
changeset
|
1685 } |
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diff
changeset
|
1686 |
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changeset
|
1687 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1688 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1689 |
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|
1690 _verbose = _cm->verbose_medium(); |
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|
1691 } |
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changeset
|
1692 |
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diff
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|
1693 void work(uint worker_id) { |
d30fa85f9994
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|
1694 assert(worker_id < _n_workers, "invariant"); |
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|
1695 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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6750
diff
changeset
|
1696 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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|
1697 _actual_region_bm, _actual_card_bm, |
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changeset
|
1698 _expected_region_bm, |
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diff
changeset
|
1699 _expected_card_bm, |
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diff
changeset
|
1700 _verbose); |
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changeset
|
1701 |
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diff
changeset
|
1702 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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diff
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|
1703 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1704 worker_id, |
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1705 _n_workers, |
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1706 HeapRegion::VerifyCountClaimValue); |
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1707 } else { |
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1708 _g1h->heap_region_iterate(&verify_cl); |
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1709 } |
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1710 |
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1711 Atomic::add(verify_cl.failures(), &_failures); |
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1712 } |
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1713 |
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1714 int failures() const { return _failures; } |
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1715 }; |
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1716 |
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1717 // Closure that finalizes the liveness counting data. |
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1718 // Used during the cleanup pause. |
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1719 // Sets the bits corresponding to the interval [NTAMS, top] |
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1720 // (which contains the implicitly live objects) in the |
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1721 // card liveness bitmap. Also sets the bit for each region, |
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1722 // containing live data, in the region liveness bitmap. |
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1723 |
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1724 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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1725 public: |
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1726 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
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1727 BitMap* region_bm, |
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1728 BitMap* card_bm) : |
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1729 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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1730 |
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1731 bool doHeapRegion(HeapRegion* hr) { |
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1732 |
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1733 if (hr->continuesHumongous()) { |
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1734 // We will ignore these here and process them when their |
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1735 // associated "starts humongous" region is processed (see |
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1736 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1737 // associated "starts humongous" region to have their bit set to |
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1738 // 1 since, due to the region chunking in the parallel region |
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1739 // iteration, a "continues humongous" region might be visited |
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1740 // before its associated "starts humongous". |
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1741 return false; |
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1742 } |
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1743 |
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1744 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1745 HeapWord* top = hr->top(); |
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1746 |
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1747 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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1748 |
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1749 // Mark the allocated-since-marking portion... |
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1750 if (ntams < top) { |
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1751 // This definitely means the region has live objects. |
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1752 set_bit_for_region(hr); |
6812
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1753 |
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1754 // Now set the bits in the card bitmap for [ntams, top) |
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1755 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1756 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1757 |
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1758 // Note: if we're looking at the last region in heap - top |
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1759 // could be actually just beyond the end of the heap; end_idx |
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1760 // will then correspond to a (non-existent) card that is also |
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1761 // just beyond the heap. |
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1762 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1763 // end of object is not card aligned - increment to cover |
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1764 // all the cards spanned by the object |
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|
1765 end_idx += 1; |
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|
1766 } |
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|
1767 |
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1768 assert(end_idx <= _card_bm->size(), |
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|
1769 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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1770 end_idx, _card_bm->size())); |
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|
1771 assert(start_idx < _card_bm->size(), |
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|
1772 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1773 start_idx, _card_bm->size())); |
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|
1774 |
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1775 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
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1776 } |
4836
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1777 |
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1778 // Set the bit for the region if it contains live data |
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1779 if (hr->next_marked_bytes() > 0) { |
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1780 set_bit_for_region(hr); |
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1781 } |
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|
1782 |
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|
1783 return false; |
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|
1784 } |
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|
1785 }; |
342 | 1786 |
1787 class G1ParFinalCountTask: public AbstractGangTask { | |
1788 protected: | |
1789 G1CollectedHeap* _g1h; | |
4836
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1790 ConcurrentMark* _cm; |
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1791 BitMap* _actual_region_bm; |
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1792 BitMap* _actual_card_bm; |
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1793 |
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1794 uint _n_workers; |
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1795 |
342 | 1796 public: |
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1797 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1798 : AbstractGangTask("G1 final counting"), |
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1799 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1800 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1801 _n_workers(0) { |
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1802 // Use the value already set as the number of active threads |
6011 | 1803 // in the call to run_task(). |
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1804 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1805 assert( _g1h->workers()->active_workers() > 0, |
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1806 "Should have been previously set"); |
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1807 _n_workers = _g1h->workers()->active_workers(); |
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1808 } else { |
342 | 1809 _n_workers = 1; |
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1810 } |
342 | 1811 } |
1812 | |
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1813 void work(uint worker_id) { |
4836
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1814 assert(worker_id < _n_workers, "invariant"); |
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1815 |
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1816 FinalCountDataUpdateClosure final_update_cl(_g1h, |
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1817 _actual_region_bm, |
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1818 _actual_card_bm); |
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1819 |
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1820 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1821 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1822 worker_id, |
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1823 _n_workers, |
355 | 1824 HeapRegion::FinalCountClaimValue); |
342 | 1825 } else { |
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1826 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1827 } |
1828 } | |
1829 }; | |
1830 | |
1831 class G1ParNoteEndTask; | |
1832 | |
1833 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1834 G1CollectedHeap* _g1; | |
1835 size_t _max_live_bytes; | |
6010
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1836 uint _regions_claimed; |
342 | 1837 size_t _freed_bytes; |
2173 | 1838 FreeRegionList* _local_cleanup_list; |
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1839 HeapRegionSetCount _old_regions_removed; |
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1840 HeapRegionSetCount _humongous_regions_removed; |
2173 | 1841 HRRSCleanupTask* _hrrs_cleanup_task; |
342 | 1842 double _claimed_region_time; |
1843 double _max_region_time; | |
1844 | |
1845 public: | |
1846 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1847 FreeRegionList* local_cleanup_list, |
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1848 HRRSCleanupTask* hrrs_cleanup_task) : |
17844
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1849 _g1(g1), |
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1850 _max_live_bytes(0), _regions_claimed(0), |
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1851 _freed_bytes(0), |
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1852 _claimed_region_time(0.0), _max_region_time(0.0), |
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1853 _local_cleanup_list(local_cleanup_list), |
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1854 _old_regions_removed(), |
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1855 _humongous_regions_removed(), |
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1856 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1857 |
342 | 1858 size_t freed_bytes() { return _freed_bytes; } |
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1859 const HeapRegionSetCount& old_regions_removed() { return _old_regions_removed; } |
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1860 const HeapRegionSetCount& humongous_regions_removed() { return _humongous_regions_removed; } |
342 | 1861 |
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1862 bool doHeapRegion(HeapRegion *hr) { |
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1863 if (hr->continuesHumongous()) { |
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1864 return false; |
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1865 } |
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1866 // We use a claim value of zero here because all regions |
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1867 // were claimed with value 1 in the FinalCount task. |
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1868 _g1->reset_gc_time_stamps(hr); |
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1869 double start = os::elapsedTime(); |
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1870 _regions_claimed++; |
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1871 hr->note_end_of_marking(); |
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1872 _max_live_bytes += hr->max_live_bytes(); |
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1873 |
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1874 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { |
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1875 _freed_bytes += hr->used(); |
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1876 hr->set_containing_set(NULL); |
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1877 if (hr->isHumongous()) { |
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1878 assert(hr->startsHumongous(), "we should only see starts humongous"); |
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1879 _humongous_regions_removed.increment(1u, hr->capacity()); |
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1880 _g1->free_humongous_region(hr, _local_cleanup_list, true); |
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1881 } else { |
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1882 _old_regions_removed.increment(1u, hr->capacity()); |
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1883 _g1->free_region(hr, _local_cleanup_list, true); |
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1884 } |
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1885 } else { |
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1886 hr->rem_set()->do_cleanup_work(_hrrs_cleanup_task); |
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1887 } |
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1888 |
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1889 double region_time = (os::elapsedTime() - start); |
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1890 _claimed_region_time += region_time; |
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1891 if (region_time > _max_region_time) { |
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1892 _max_region_time = region_time; |
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1893 } |
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1894 return false; |
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1895 } |
342 | 1896 |
1897 size_t max_live_bytes() { return _max_live_bytes; } | |
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1898 uint regions_claimed() { return _regions_claimed; } |
342 | 1899 double claimed_region_time_sec() { return _claimed_region_time; } |
1900 double max_region_time_sec() { return _max_region_time; } | |
1901 }; | |
1902 | |
1903 class G1ParNoteEndTask: public AbstractGangTask { | |
1904 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1905 |
342 | 1906 protected: |
1907 G1CollectedHeap* _g1h; | |
1908 size_t _max_live_bytes; | |
1909 size_t _freed_bytes; | |
2152 | 1910 FreeRegionList* _cleanup_list; |
1911 | |
342 | 1912 public: |
1913 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1914 FreeRegionList* cleanup_list) : |
342 | 1915 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1916 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1917 |
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1918 void work(uint worker_id) { |
342 | 1919 double start = os::elapsedTime(); |
2173 | 1920 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1921 HRRSCleanupTask hrrs_cleanup_task; | |
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1922 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, &local_cleanup_list, |
2173 | 1923 &hrrs_cleanup_task); |
1833
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1924 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1925 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1926 _g1h->workers()->active_workers(), |
355 | 1927 HeapRegion::NoteEndClaimValue); |
342 | 1928 } else { |
1929 _g1h->heap_region_iterate(&g1_note_end); | |
1930 } | |
1931 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1932 | |
2152 | 1933 // Now update the lists |
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1934 _g1h->remove_from_old_sets(g1_note_end.old_regions_removed(), g1_note_end.humongous_regions_removed()); |
342 | 1935 { |
1936 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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1937 _g1h->decrement_summary_bytes(g1_note_end.freed_bytes()); |
342 | 1938 _max_live_bytes += g1_note_end.max_live_bytes(); |
1939 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1940 |
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1941 // If we iterate over the global cleanup list at the end of |
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1942 // cleanup to do this printing we will not guarantee to only |
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1943 // generate output for the newly-reclaimed regions (the list |
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1944 // might not be empty at the beginning of cleanup; we might |
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1945 // still be working on its previous contents). So we do the |
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1946 // printing here, before we append the new regions to the global |
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1947 // cleanup list. |
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1948 |
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1949 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1950 if (hr_printer->is_active()) { |
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1951 FreeRegionListIterator iter(&local_cleanup_list); |
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1952 while (iter.more_available()) { |
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1953 HeapRegion* hr = iter.get_next(); |
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1954 hr_printer->cleanup(hr); |
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1955 } |
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1956 } |
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1957 |
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1958 _cleanup_list->add_ordered(&local_cleanup_list); |
2173 | 1959 assert(local_cleanup_list.is_empty(), "post-condition"); |
1960 | |
1961 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1962 } |
1963 } | |
1964 size_t max_live_bytes() { return _max_live_bytes; } | |
1965 size_t freed_bytes() { return _freed_bytes; } | |
1966 }; | |
1967 | |
1968 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1969 protected: | |
1970 G1RemSet* _g1rs; | |
1971 BitMap* _region_bm; | |
1972 BitMap* _card_bm; | |
1973 public: | |
1974 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1975 BitMap* region_bm, BitMap* card_bm) : | |
1976 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1977 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1978 |
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1979 void work(uint worker_id) { |
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1980 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1981 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1982 HeapRegion::ScrubRemSetClaimValue); |
342 | 1983 } else { |
1984 _g1rs->scrub(_region_bm, _card_bm); | |
1985 } | |
1986 } | |
1987 | |
1988 }; | |
1989 | |
1990 void ConcurrentMark::cleanup() { | |
1991 // world is stopped at this checkpoint | |
1992 assert(SafepointSynchronize::is_at_safepoint(), | |
1993 "world should be stopped"); | |
1994 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1995 | |
1996 // If a full collection has happened, we shouldn't do this. | |
1997 if (has_aborted()) { | |
1998 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1999 return; | |
2000 } | |
2001 | |
2152 | 2002 g1h->verify_region_sets_optional(); |
2003 | |
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2004 if (VerifyDuringGC) { |
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2005 HandleMark hm; // handle scope |
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2006 Universe::heap()->prepare_for_verify(); |
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2007 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2008 " VerifyDuringGC:(before)"); |
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2009 } |
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2010 |
342 | 2011 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
2012 g1p->record_concurrent_mark_cleanup_start(); | |
2013 | |
2014 double start = os::elapsedTime(); | |
2015 | |
2173 | 2016 HeapRegionRemSet::reset_for_cleanup_tasks(); |
2017 | |
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2018 uint n_workers; |
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2019 |
342 | 2020 // Do counting once more with the world stopped for good measure. |
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2021 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2022 |
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2023 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2024 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 2025 "sanity check"); |
2026 | |
4711 | 2027 g1h->set_par_threads(); |
2028 n_workers = g1h->n_par_threads(); | |
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2029 assert(g1h->n_par_threads() == n_workers, |
4711 | 2030 "Should not have been reset"); |
342 | 2031 g1h->workers()->run_task(&g1_par_count_task); |
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2032 // Done with the parallel phase so reset to 0. |
342 | 2033 g1h->set_par_threads(0); |
355 | 2034 |
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2035 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2036 "sanity check"); |
342 | 2037 } else { |
4711 | 2038 n_workers = 1; |
342 | 2039 g1_par_count_task.work(0); |
2040 } | |
2041 | |
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2042 if (VerifyDuringGC) { |
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2043 // Verify that the counting data accumulated during marking matches |
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2044 // that calculated by walking the marking bitmap. |
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2045 |
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2046 // Bitmaps to hold expected values |
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2047 BitMap expected_region_bm(_region_bm.size(), true); |
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2048 BitMap expected_card_bm(_card_bm.size(), true); |
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2049 |
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|
2050 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2051 &_region_bm, |
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2052 &_card_bm, |
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2053 &expected_region_bm, |
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|
2054 &expected_card_bm); |
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|
2055 |
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|
2056 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2057 g1h->set_par_threads((int)n_workers); |
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2058 g1h->workers()->run_task(&g1_par_verify_task); |
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2059 // Done with the parallel phase so reset to 0. |
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|
2060 g1h->set_par_threads(0); |
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|
2061 |
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|
2062 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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|
2063 "sanity check"); |
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|
2064 } else { |
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|
2065 g1_par_verify_task.work(0); |
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|
2066 } |
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|
2067 |
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|
2068 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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|
2069 } |
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|
2070 |
342 | 2071 size_t start_used_bytes = g1h->used(); |
2072 g1h->set_marking_complete(); | |
2073 | |
2074 double count_end = os::elapsedTime(); | |
2075 double this_final_counting_time = (count_end - start); | |
2076 _total_counting_time += this_final_counting_time; | |
2077 | |
2435
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|
2078 if (G1PrintRegionLivenessInfo) { |
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2079 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2080 _g1h->heap_region_iterate(&cl); |
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2081 } |
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|
2082 |
342 | 2083 // Install newly created mark bitMap as "prev". |
2084 swapMarkBitMaps(); | |
2085 | |
2086 g1h->reset_gc_time_stamp(); | |
2087 | |
2088 // Note end of marking in all heap regions. | |
2152 | 2089 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
1833
8b10f48633dc
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|
2090 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4095
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|
2091 g1h->set_par_threads((int)n_workers); |
342 | 2092 g1h->workers()->run_task(&g1_par_note_end_task); |
2093 g1h->set_par_threads(0); | |
355 | 2094 |
2095 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2096 "sanity check"); | |
342 | 2097 } else { |
2098 g1_par_note_end_task.work(0); | |
2099 } | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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|
2100 g1h->check_gc_time_stamps(); |
2152 | 2101 |
2102 if (!cleanup_list_is_empty()) { | |
2103 // The cleanup list is not empty, so we'll have to process it | |
2104 // concurrently. Notify anyone else that might be wanting free | |
2105 // regions that there will be more free regions coming soon. | |
2106 g1h->set_free_regions_coming(); | |
2107 } | |
342 | 2108 |
2109 // call below, since it affects the metric by which we sort the heap | |
2110 // regions. | |
2111 if (G1ScrubRemSets) { | |
2112 double rs_scrub_start = os::elapsedTime(); | |
2113 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
1833
8b10f48633dc
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|
2114 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4095
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|
2115 g1h->set_par_threads((int)n_workers); |
342 | 2116 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2117 g1h->set_par_threads(0); | |
355 | 2118 |
2119 assert(g1h->check_heap_region_claim_values( | |
2120 HeapRegion::ScrubRemSetClaimValue), | |
2121 "sanity check"); | |
342 | 2122 } else { |
2123 g1_par_scrub_rs_task.work(0); | |
2124 } | |
2125 | |
2126 double rs_scrub_end = os::elapsedTime(); | |
2127 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2128 _total_rs_scrub_time += this_rs_scrub_time; | |
2129 } | |
2130 | |
2131 // this will also free any regions totally full of garbage objects, | |
2132 // and sort the regions. | |
4095
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|
2133 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2134 |
2135 // Statistics. | |
2136 double end = os::elapsedTime(); | |
2137 _cleanup_times.add((end - start) * 1000.0); | |
2138 | |
6007
5c86f8211d1e
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brutisso
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5988
diff
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|
2139 if (G1Log::fine()) { |
342 | 2140 g1h->print_size_transition(gclog_or_tty, |
2141 start_used_bytes, | |
2142 g1h->used(), | |
2143 g1h->capacity()); | |
2144 } | |
2145 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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|
2146 // Clean up will have freed any regions completely full of garbage. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2147 // Update the soft reference policy with the new heap occupancy. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2148 Universe::update_heap_info_at_gc(); |
4dfb2df418f2
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|
2149 |
751 | 2150 if (VerifyDuringGC) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
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|
2151 HandleMark hm; // handle scope |
df6caf649ff7
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|
2152 Universe::heap()->prepare_for_verify(); |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
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9076
diff
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|
2153 Universe::verify(VerifyOption_G1UsePrevMarking, |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
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|
2154 " VerifyDuringGC:(after)"); |
342 | 2155 } |
2152 | 2156 |
2157 g1h->verify_region_sets_optional(); | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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|
2158 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
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|
2159 // We need to make this be a "collection" so any collection pause that |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2160 // races with it goes around and waits for completeCleanup to finish. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2161 g1h->increment_total_collections(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2162 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20263
diff
changeset
|
2163 // Clean out dead classes and update Metaspace sizes. |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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20278
diff
changeset
|
2164 if (ClassUnloadingWithConcurrentMark) { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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20278
diff
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|
2165 ClassLoaderDataGraph::purge(); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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20278
diff
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|
2166 } |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2167 MetaspaceGC::compute_new_size(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2168 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2169 // We reclaimed old regions so we should calculate the sizes to make |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
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|
2170 // sure we update the old gen/space data. |
2c6ef90f030a
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diff
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|
2171 g1h->g1mm()->update_sizes(); |
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|
2172 |
10405 | 2173 g1h->trace_heap_after_concurrent_cycle(); |
342 | 2174 } |
2175 | |
2176 void ConcurrentMark::completeCleanup() { | |
2177 if (has_aborted()) return; | |
2178 | |
2152 | 2179 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2180 | |
17841
14bd75c9dbfa
8039089: List verification enabled in product builds
jwilhelm
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17773
diff
changeset
|
2181 _cleanup_list.verify_optional(); |
2361 | 2182 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2183 |
2184 if (G1ConcRegionFreeingVerbose) { | |
2185 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
changeset
|
2186 "cleanup list has %u entries", |
2152 | 2187 _cleanup_list.length()); |
2188 } | |
2189 | |
2190 // Noone else should be accessing the _cleanup_list at this point, | |
2191 // so it's not necessary to take any locks | |
2192 while (!_cleanup_list.is_empty()) { | |
2193 HeapRegion* hr = _cleanup_list.remove_head(); | |
17773
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17750
diff
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|
2194 assert(hr != NULL, "Got NULL from a non-empty list"); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3316
diff
changeset
|
2195 hr->par_clear(); |
17773
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8036025: Sort the freelist in order to shrink the heap
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17750
diff
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|
2196 tmp_free_list.add_ordered(hr); |
2152 | 2197 |
2198 // Instead of adding one region at a time to the secondary_free_list, | |
2199 // we accumulate them in the local list and move them a few at a | |
2200 // time. This also cuts down on the number of notify_all() calls | |
2201 // we do during this process. We'll also append the local list when | |
2202 // _cleanup_list is empty (which means we just removed the last | |
2203 // region from the _cleanup_list). | |
2361 | 2204 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2205 _cleanup_list.is_empty()) { |
2206 if (G1ConcRegionFreeingVerbose) { | |
2207 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
720b6a76dd9d
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tonyp
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6008
diff
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|
2208 "appending %u entries to the secondary_free_list, " |
720b6a76dd9d
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tonyp
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diff
changeset
|
2209 "cleanup list still has %u entries", |
2361 | 2210 tmp_free_list.length(), |
2152 | 2211 _cleanup_list.length()); |
342 | 2212 } |
2152 | 2213 |
2214 { | |
2215 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
17773
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|
2216 g1h->secondary_free_list_add(&tmp_free_list); |
2152 | 2217 SecondaryFreeList_lock->notify_all(); |
2218 } | |
2219 | |
2220 if (G1StressConcRegionFreeing) { | |
2221 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2222 os::sleep(Thread::current(), (jlong) 1, false); | |
2223 } | |
2224 } | |
342 | 2225 } |
2226 } | |
2361 | 2227 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2228 } |
2229 | |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2230 // Supporting Object and Oop closures for reference discovery |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2231 // and processing in during marking |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2232 |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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1974
diff
changeset
|
2233 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2234 HeapWord* addr = (HeapWord*)obj; |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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1974
diff
changeset
|
2235 return addr != NULL && |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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1974
diff
changeset
|
2236 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
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|
2237 } |
342 | 2238 |
8014
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8008
diff
changeset
|
2239 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
f90b9bceb8e5
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8008
diff
changeset
|
2240 // Uses the CMTask associated with a worker thread (for serial reference |
f90b9bceb8e5
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8008
diff
changeset
|
2241 // processing the CMTask for worker 0 is used) to preserve (mark) and |
f90b9bceb8e5
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johnc
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8008
diff
changeset
|
2242 // trace referent objects. |
f90b9bceb8e5
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8008
diff
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|
2243 // |
f90b9bceb8e5
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8008
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|
2244 // Using the CMTask and embedded local queues avoids having the worker |
f90b9bceb8e5
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8008
diff
changeset
|
2245 // threads operating on the global mark stack. This reduces the risk |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2246 // of overflowing the stack - which we would rather avoid at this late |
f90b9bceb8e5
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8008
diff
changeset
|
2247 // state. Also using the tasks' local queues removes the potential |
f90b9bceb8e5
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8008
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changeset
|
2248 // of the workers interfering with each other that could occur if |
f90b9bceb8e5
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8008
diff
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|
2249 // operating on the global stack. |
f90b9bceb8e5
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8008
diff
changeset
|
2250 |
f90b9bceb8e5
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8008
diff
changeset
|
2251 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
8787
fa08949fe0cb
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8744
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|
2252 ConcurrentMark* _cm; |
fa08949fe0cb
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8744
diff
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|
2253 CMTask* _task; |
fa08949fe0cb
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8744
diff
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|
2254 int _ref_counter_limit; |
fa08949fe0cb
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8744
diff
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|
2255 int _ref_counter; |
fa08949fe0cb
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8744
diff
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|
2256 bool _is_serial; |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2257 public: |
8787
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8744
diff
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|
2258 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
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8744
diff
changeset
|
2259 _cm(cm), _task(task), _is_serial(is_serial), |
fa08949fe0cb
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8744
diff
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|
2260 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2261 assert(_ref_counter_limit > 0, "sanity"); |
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2262 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
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2263 _ref_counter = _ref_counter_limit; |
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2264 } |
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2265 |
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2266 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2267 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2268 |
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2269 template <class T> void do_oop_work(T* p) { |
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2270 if (!_cm->has_overflown()) { |
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2271 oop obj = oopDesc::load_decode_heap_oop(p); |
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2272 if (_cm->verbose_high()) { |
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2273 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
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2274 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2275 _task->worker_id(), p2i(p), p2i((void*) obj)); |
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2276 } |
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2277 |
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2278 _task->deal_with_reference(obj); |
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2279 _ref_counter--; |
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2280 |
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2281 if (_ref_counter == 0) { |
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2282 // We have dealt with _ref_counter_limit references, pushing them |
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2283 // and objects reachable from them on to the local stack (and |
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2284 // possibly the global stack). Call CMTask::do_marking_step() to |
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2285 // process these entries. |
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2286 // |
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2287 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
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2288 // there's nothing more to do (i.e. we're done with the entries that |
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2289 // were pushed as a result of the CMTask::deal_with_reference() calls |
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2290 // above) or we overflow. |
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2291 // |
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2292 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2293 // flag while there may still be some work to do. (See the comment at |
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2294 // the beginning of CMTask::do_marking_step() for those conditions - |
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2295 // one of which is reaching the specified time target.) It is only |
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2296 // when CMTask::do_marking_step() returns without setting the |
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2297 // has_aborted() flag that the marking step has completed. |
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2298 do { |
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2299 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2300 _task->do_marking_step(mark_step_duration_ms, |
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2301 false /* do_termination */, |
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2302 _is_serial); |
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2303 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2304 _ref_counter = _ref_counter_limit; |
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2305 } |
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2306 } else { |
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2307 if (_cm->verbose_high()) { |
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2308 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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2309 } |
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2310 } |
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|
2311 } |
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|
2312 }; |
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2313 |
8014
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2314 // 'Drain' oop closure used by both serial and parallel reference processing. |
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2315 // Uses the CMTask associated with a given worker thread (for serial |
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|
2316 // reference processing the CMtask for worker 0 is used). Calls the |
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2317 // do_marking_step routine, with an unbelievably large timeout value, |
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|
2318 // to drain the marking data structures of the remaining entries |
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2319 // added by the 'keep alive' oop closure above. |
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|
2320 |
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|
2321 class G1CMDrainMarkingStackClosure: public VoidClosure { |
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2322 ConcurrentMark* _cm; |
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|
2323 CMTask* _task; |
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2324 bool _is_serial; |
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|
2325 public: |
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2326 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2327 _cm(cm), _task(task), _is_serial(is_serial) { |
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|
2328 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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|
2329 } |
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|
2330 |
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|
2331 void do_void() { |
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|
2332 do { |
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2333 if (_cm->verbose_high()) { |
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|
2334 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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|
2335 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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|
2336 } |
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|
2337 |
8014
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|
2338 // We call CMTask::do_marking_step() to completely drain the local |
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|
2339 // and global marking stacks of entries pushed by the 'keep alive' |
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|
2340 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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|
2341 // |
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|
2342 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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|
2343 // if there's nothing more to do (i.e. we'completely drained the |
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|
2344 // entries that were pushed as a a result of applying the 'keep alive' |
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|
2345 // closure to the entries on the discovered ref lists) or we overflow |
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|
2346 // the global marking stack. |
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|
2347 // |
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|
2348 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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|
2349 // flag while there may still be some work to do. (See the comment at |
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|
2350 // the beginning of CMTask::do_marking_step() for those conditions - |
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|
2351 // one of which is reaching the specified time target.) It is only |
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|
2352 // when CMTask::do_marking_step() returns without setting the |
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|
2353 // has_aborted() flag that the marking step has completed. |
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|
2354 |
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|
2355 _task->do_marking_step(1000000000.0 /* something very large */, |
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|
2356 true /* do_termination */, |
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|
2357 _is_serial); |
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|
2358 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2359 } |
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|
2360 }; |
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|
2361 |
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|
2362 // Implementation of AbstractRefProcTaskExecutor for parallel |
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|
2363 // reference processing at the end of G1 concurrent marking |
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|
2364 |
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|
2365 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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|
2366 private: |
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|
2367 G1CollectedHeap* _g1h; |
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|
2368 ConcurrentMark* _cm; |
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|
2369 WorkGang* _workers; |
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|
2370 int _active_workers; |
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|
2371 |
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|
2372 public: |
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|
2373 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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|
2374 ConcurrentMark* cm, |
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|
2375 WorkGang* workers, |
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|
2376 int n_workers) : |
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2377 _g1h(g1h), _cm(cm), |
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2378 _workers(workers), _active_workers(n_workers) { } |
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|
2379 |
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|
2380 // Executes the given task using concurrent marking worker threads. |
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|
2381 virtual void execute(ProcessTask& task); |
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|
2382 virtual void execute(EnqueueTask& task); |
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|
2383 }; |
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|
2384 |
3979
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|
2385 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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|
2386 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2387 ProcessTask& _proc_task; |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2388 G1CollectedHeap* _g1h; |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2389 ConcurrentMark* _cm; |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2390 |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
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|
2391 public: |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3977
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|
2392 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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6608385: G1: need to support parallel reference processing
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diff
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|
2393 G1CollectedHeap* g1h, |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
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4072
diff
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|
2394 ConcurrentMark* cm) : |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2395 AbstractGangTask("Process reference objects in parallel"), |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2396 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2397 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
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|
2398 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
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|
2399 } |
2174
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6608385: G1: need to support parallel reference processing
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|
2400 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2401 virtual void work(uint worker_id) { |
20306
e02e18f40eae
8050973: CMS/G1 GC: add missing Resource and Handle mark
mdoerr
parents:
20302
diff
changeset
|
2402 ResourceMark rm; |
e02e18f40eae
8050973: CMS/G1 GC: add missing Resource and Handle mark
mdoerr
parents:
20302
diff
changeset
|
2403 HandleMark hm; |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2404 CMTask* task = _cm->task(worker_id); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2405 G1CMIsAliveClosure g1_is_alive(_g1h); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2406 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
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diff
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|
2407 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
2174
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6608385: G1: need to support parallel reference processing
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parents:
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|
2408 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
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|
2409 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2410 } |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2411 }; |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2412 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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changeset
|
2413 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
234761c55641
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parents:
2152
diff
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|
2414 assert(_workers != NULL, "Need parallel worker threads."); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2415 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
2416 |
4093
6071e0581859
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diff
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|
2417 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
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|
2418 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2419 // We need to reset the concurrency level before each |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2420 // proxy task execution, so that the termination protocol |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2421 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2422 // how many workers to wait for. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2423 _cm->set_concurrency(_active_workers); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
changeset
|
2424 _g1h->set_par_threads(_active_workers); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2425 _workers->run_task(&proc_task_proxy); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2426 _g1h->set_par_threads(0); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2427 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2428 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2429 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2430 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2431 EnqueueTask& _enq_task; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2432 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2433 public: |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2434 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2435 AbstractGangTask("Enqueue reference objects in parallel"), |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2436 _enq_task(enq_task) { } |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2437 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2438 virtual void work(uint worker_id) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2439 _enq_task.work(worker_id); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2440 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2441 }; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2442 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2443 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2444 assert(_workers != NULL, "Need parallel worker threads."); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2445 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2446 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2447 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2448 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2449 // Not strictly necessary but... |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2450 // |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2451 // We need to reset the concurrency level before each |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2452 // proxy task execution, so that the termination protocol |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2453 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2454 // how many workers to wait for. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2455 _cm->set_concurrency(_active_workers); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2456 _g1h->set_par_threads(_active_workers); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2457 _workers->run_task(&enq_task_proxy); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2458 _g1h->set_par_threads(0); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2459 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2460 |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2461 void ConcurrentMark::weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2462 G1CollectedHeap::heap()->parallel_cleaning(is_alive, true, true, purged_classes); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2463 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2464 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2465 // Helper class to get rid of some boilerplate code. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2466 class G1RemarkGCTraceTime : public GCTraceTime { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2467 static bool doit_and_prepend(bool doit) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2468 if (doit) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2469 gclog_or_tty->put(' '); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2470 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2471 return doit; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2472 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2473 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2474 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2475 G1RemarkGCTraceTime(const char* title, bool doit) |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2476 : GCTraceTime(title, doit_and_prepend(doit), false, G1CollectedHeap::heap()->gc_timer_cm(), |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2477 G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2478 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2479 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2480 |
342 | 2481 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2482 if (has_overflown()) { |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2483 // Skip processing the discovered references if we have |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2484 // overflown the global marking stack. Reference objects |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2485 // only get discovered once so it is OK to not |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2486 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2487 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2488 // less reference objects are discovered. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2489 return; |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2490 } |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2491 |
342 | 2492 ResourceMark rm; |
2493 HandleMark hm; | |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2494 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2495 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2496 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2497 // Is alive closure. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2498 G1CMIsAliveClosure g1_is_alive(g1h); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2499 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2500 // Inner scope to exclude the cleaning of the string and symbol |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2501 // tables from the displayed time. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2502 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2503 if (G1Log::finer()) { |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2504 gclog_or_tty->put(' '); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2505 } |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2506 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm(), concurrent_gc_id()); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2507 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2508 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2509 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2510 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2511 // about how reference processing currently works in G1. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2512 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2513 // Set the soft reference policy |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2514 rp->setup_policy(clear_all_soft_refs); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2515 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2516 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2517 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2518 // in serial reference processing. Note these closures are also |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2519 // used for serially processing (by the the current thread) the |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2520 // JNI references during parallel reference processing. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2521 // |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2522 // These closures do not need to synchronize with the worker |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2523 // threads involved in parallel reference processing as these |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2524 // instances are executed serially by the current thread (e.g. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2525 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2526 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2527 // |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2528 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2529 // their own instances of these closures, which do their own |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2530 // synchronization among themselves. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2531 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2532 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2533 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2534 // We need at least one active thread. If reference processing |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2535 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2536 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2537 // we utilize all the worker threads we can. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2538 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2539 uint active_workers = (processing_is_mt ? g1h->workers()->active_workers() : 1U); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2540 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2541 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2542 // Parallel processing task executor. |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2543 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2544 g1h->workers(), active_workers); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2545 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2546 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2547 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2548 // executing the remark task. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2549 set_concurrency(active_workers); |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2550 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2551 // Set the degree of MT processing here. If the discovery was done MT, |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2552 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2553 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2554 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2555 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2556 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2557 // Process the weak references. |
10405 | 2558 const ReferenceProcessorStats& stats = |
2559 rp->process_discovered_references(&g1_is_alive, | |
2560 &g1_keep_alive, | |
2561 &g1_drain_mark_stack, | |
2562 executor, | |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2563 g1h->gc_timer_cm(), |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2564 concurrent_gc_id()); |
10405 | 2565 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2566 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2567 // The do_oop work routines of the keep_alive and drain_marking_stack |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2568 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2569 // global marking stack. |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2570 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2571 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2572 "mark stack should be empty (unless it overflowed)"); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2573 |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2574 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2575 // This should have been done already when we tried to push an |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2576 // entry on to the global mark stack. But let's do it again. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2577 set_has_overflown(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2578 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2579 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2580 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2581 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2582 rp->enqueue_discovered_references(executor); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2583 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2584 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2585 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2586 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2587 |
17750
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2588 if (has_overflown()) { |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2589 // We can not trust g1_is_alive if the marking stack overflowed |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2590 return; |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2591 } |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2592 |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2593 assert(_markStack.isEmpty(), "Marking should have completed"); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2594 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2595 // Unload Klasses, String, Symbols, Code Cache, etc. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2596 { |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2597 G1RemarkGCTraceTime trace("Unloading", G1Log::finer()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2598 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2599 if (ClassUnloadingWithConcurrentMark) { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2600 bool purged_classes; |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2601 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2602 { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2603 G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2604 purged_classes = SystemDictionary::do_unloading(&g1_is_alive); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2605 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2606 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2607 { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2608 G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2609 weakRefsWorkParallelPart(&g1_is_alive, purged_classes); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2610 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2611 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2612 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2613 if (G1StringDedup::is_enabled()) { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2614 G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2615 G1StringDedup::unlink(&g1_is_alive); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2616 } |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2617 } |
342 | 2618 } |
2619 | |
2620 void ConcurrentMark::swapMarkBitMaps() { | |
2621 CMBitMapRO* temp = _prevMarkBitMap; | |
2622 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2623 _nextMarkBitMap = (CMBitMap*) temp; | |
2624 } | |
2625 | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2626 class CMObjectClosure; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2627 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2628 // Closure for iterating over objects, currently only used for |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2629 // processing SATB buffers. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2630 class CMObjectClosure : public ObjectClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2631 private: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2632 CMTask* _task; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2633 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2634 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2635 void do_object(oop obj) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2636 _task->deal_with_reference(obj); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2637 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2638 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2639 CMObjectClosure(CMTask* task) : _task(task) { } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2640 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2641 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2642 class G1RemarkThreadsClosure : public ThreadClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2643 CMObjectClosure _cm_obj; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2644 G1CMOopClosure _cm_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2645 MarkingCodeBlobClosure _code_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2646 int _thread_parity; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2647 bool _is_par; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2648 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2649 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2650 G1RemarkThreadsClosure(G1CollectedHeap* g1h, CMTask* task, bool is_par) : |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2651 _cm_obj(task), _cm_cl(g1h, g1h->concurrent_mark(), task), _code_cl(&_cm_cl, !CodeBlobToOopClosure::FixRelocations), |
2c6ef90f030a
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2652 _thread_parity(SharedHeap::heap()->strong_roots_parity()), _is_par(is_par) {} |
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2653 |
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2654 void do_thread(Thread* thread) { |
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2655 if (thread->is_Java_thread()) { |
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2656 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
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2657 JavaThread* jt = (JavaThread*)thread; |
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2658 |
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|
2659 // In theory it should not be neccessary to explicitly walk the nmethods to find roots for concurrent marking |
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2660 // however the liveness of oops reachable from nmethods have very complex lifecycles: |
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2661 // * Alive if on the stack of an executing method |
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2662 // * Weakly reachable otherwise |
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2663 // Some objects reachable from nmethods, such as the class loader (or klass_holder) of the receiver should be |
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2664 // live by the SATB invariant but other oops recorded in nmethods may behave differently. |
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2665 jt->nmethods_do(&_code_cl); |
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2666 |
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2667 jt->satb_mark_queue().apply_closure_and_empty(&_cm_obj); |
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2668 } |
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|
2669 } else if (thread->is_VM_thread()) { |
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2670 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
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2671 JavaThread::satb_mark_queue_set().shared_satb_queue()->apply_closure_and_empty(&_cm_obj); |
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2672 } |
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|
2673 } |
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|
2674 } |
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|
2675 }; |
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2676 |
342 | 2677 class CMRemarkTask: public AbstractGangTask { |
2678 private: | |
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2679 ConcurrentMark* _cm; |
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2680 bool _is_serial; |
342 | 2681 public: |
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2682 void work(uint worker_id) { |
342 | 2683 // Since all available tasks are actually started, we should |
2684 // only proceed if we're supposed to be actived. | |
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2685 if (worker_id < _cm->active_tasks()) { |
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2686 CMTask* task = _cm->task(worker_id); |
342 | 2687 task->record_start_time(); |
20278
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2688 { |
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|
2689 ResourceMark rm; |
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|
2690 HandleMark hm; |
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|
2691 |
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2692 G1RemarkThreadsClosure threads_f(G1CollectedHeap::heap(), task, !_is_serial); |
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2693 Threads::threads_do(&threads_f); |
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2694 } |
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2695 |
342 | 2696 do { |
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|
2697 task->do_marking_step(1000000000.0 /* something very large */, |
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|
2698 true /* do_termination */, |
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|
2699 _is_serial); |
342 | 2700 } while (task->has_aborted() && !_cm->has_overflown()); |
2701 // If we overflow, then we do not want to restart. We instead | |
2702 // want to abort remark and do concurrent marking again. | |
2703 task->record_end_time(); | |
2704 } | |
2705 } | |
2706 | |
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2707 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
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2708 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2709 _cm->terminator()->reset_for_reuse(active_workers); |
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|
2710 } |
342 | 2711 }; |
2712 | |
2713 void ConcurrentMark::checkpointRootsFinalWork() { | |
2714 ResourceMark rm; | |
2715 HandleMark hm; | |
2716 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2717 | |
20278
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2718 G1RemarkGCTraceTime trace("Finalize Marking", G1Log::finer()); |
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2719 |
342 | 2720 g1h->ensure_parsability(false); |
2721 | |
1833
8b10f48633dc
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2722 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2723 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2724 // this is remark, so we'll use up all active threads |
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2725 uint active_workers = g1h->workers()->active_workers(); |
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2726 if (active_workers == 0) { |
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|
2727 assert(active_workers > 0, "Should have been set earlier"); |
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2728 active_workers = (uint) ParallelGCThreads; |
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|
2729 g1h->workers()->set_active_workers(active_workers); |
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|
2730 } |
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|
2731 set_concurrency_and_phase(active_workers, false /* concurrent */); |
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|
2732 // Leave _parallel_marking_threads at it's |
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|
2733 // value originally calculated in the ConcurrentMark |
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|
2734 // constructor and pass values of the active workers |
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|
2735 // through the gang in the task. |
342 | 2736 |
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2737 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
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2738 // We will start all available threads, even if we decide that the |
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|
2739 // active_workers will be fewer. The extra ones will just bail out |
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|
2740 // immediately. |
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|
2741 g1h->set_par_threads(active_workers); |
342 | 2742 g1h->workers()->run_task(&remarkTask); |
2743 g1h->set_par_threads(0); | |
2744 } else { | |
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|
2745 G1CollectedHeap::StrongRootsScope srs(g1h); |
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|
2746 uint active_workers = 1; |
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|
2747 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2748 |
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|
2749 // Note - if there's no work gang then the VMThread will be |
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|
2750 // the thread to execute the remark - serially. We have |
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|
2751 // to pass true for the is_serial parameter so that |
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|
2752 // CMTask::do_marking_step() doesn't enter the sync |
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|
2753 // barriers in the event of an overflow. Doing so will |
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|
2754 // cause an assert that the current thread is not a |
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|
2755 // concurrent GC thread. |
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|
2756 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2757 remarkTask.work(0); |
2758 } | |
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diff
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|
2759 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
8789
1179172e9ec9
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|
2760 guarantee(has_overflown() || |
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|
2761 satb_mq_set.completed_buffers_num() == 0, |
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|
2762 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
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|
2763 BOOL_TO_STR(has_overflown()), |
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|
2764 satb_mq_set.completed_buffers_num())); |
342 | 2765 |
2766 print_stats(); | |
2767 } | |
2768 | |
1044 | 2769 #ifndef PRODUCT |
2770 | |
1388 | 2771 class PrintReachableOopClosure: public OopClosure { |
342 | 2772 private: |
2773 G1CollectedHeap* _g1h; | |
2774 outputStream* _out; | |
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|
2775 VerifyOption _vo; |
1388 | 2776 bool _all; |
342 | 2777 |
2778 public: | |
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|
2779 PrintReachableOopClosure(outputStream* out, |
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|
2780 VerifyOption vo, |
1388 | 2781 bool all) : |
1044 | 2782 _g1h(G1CollectedHeap::heap()), |
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|
2783 _out(out), _vo(vo), _all(all) { } |
342 | 2784 |
845
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|
2785 void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
2786 void do_oop( oop* p) { do_oop_work(p); } |
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|
2787 |
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|
2788 template <class T> void do_oop_work(T* p) { |
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|
2789 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2790 const char* str = NULL; |
2791 const char* str2 = ""; | |
2792 | |
1388 | 2793 if (obj == NULL) { |
2794 str = ""; | |
2795 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2796 str = " O"; | |
2797 } else { | |
342 | 2798 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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|
2799 guarantee(hr != NULL, "invariant"); |
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|
2800 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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|
2801 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2802 |
2803 if (over_tams) { | |
1388 | 2804 str = " >"; |
2805 if (marked) { | |
342 | 2806 str2 = " AND MARKED"; |
1044 | 2807 } |
1388 | 2808 } else if (marked) { |
2809 str = " M"; | |
1044 | 2810 } else { |
1388 | 2811 str = " NOT"; |
1044 | 2812 } |
342 | 2813 } |
2814 | |
1388 | 2815 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
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diff
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|
2816 p2i(p), p2i((void*) obj), str, str2); |
342 | 2817 } |
2818 }; | |
2819 | |
1388 | 2820 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2821 private: |
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|
2822 G1CollectedHeap* _g1h; |
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|
2823 outputStream* _out; |
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|
2824 VerifyOption _vo; |
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|
2825 bool _all; |
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|
2826 HeapRegion* _hr; |
342 | 2827 |
2828 public: | |
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|
2829 PrintReachableObjectClosure(outputStream* out, |
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|
2830 VerifyOption vo, |
1388 | 2831 bool all, |
2832 HeapRegion* hr) : | |
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|
2833 _g1h(G1CollectedHeap::heap()), |
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|
2834 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2835 |
2836 void do_object(oop o) { | |
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2837 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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2838 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2839 bool print_it = _all || over_tams || marked; |
2840 | |
2841 if (print_it) { | |
2842 _out->print_cr(" "PTR_FORMAT"%s", | |
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2843 p2i((void *)o), (over_tams) ? " >" : (marked) ? " M" : ""); |
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2844 PrintReachableOopClosure oopCl(_out, _vo, _all); |
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2845 o->oop_iterate_no_header(&oopCl); |
1388 | 2846 } |
342 | 2847 } |
2848 }; | |
2849 | |
1388 | 2850 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2851 private: |
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2852 G1CollectedHeap* _g1h; |
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2853 outputStream* _out; |
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2854 VerifyOption _vo; |
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2855 bool _all; |
342 | 2856 |
2857 public: | |
2858 bool doHeapRegion(HeapRegion* hr) { | |
2859 HeapWord* b = hr->bottom(); | |
2860 HeapWord* e = hr->end(); | |
2861 HeapWord* t = hr->top(); | |
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2862 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2863 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
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2864 "TAMS: " PTR_FORMAT, p2i(b), p2i(e), p2i(t), p2i(p)); |
1388 | 2865 _out->cr(); |
2866 | |
2867 HeapWord* from = b; | |
2868 HeapWord* to = t; | |
2869 | |
2870 if (to > from) { | |
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2871 _out->print_cr("Objects in [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(from), p2i(to)); |
1388 | 2872 _out->cr(); |
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2873 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2874 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2875 _out->cr(); | |
2876 } | |
342 | 2877 |
2878 return false; | |
2879 } | |
2880 | |
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2881 PrintReachableRegionClosure(outputStream* out, |
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2882 VerifyOption vo, |
1388 | 2883 bool all) : |
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2884 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2885 }; |
2886 | |
1388 | 2887 void ConcurrentMark::print_reachable(const char* str, |
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2888 VerifyOption vo, |
1388 | 2889 bool all) { |
2890 gclog_or_tty->cr(); | |
2891 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2892 |
2893 if (G1PrintReachableBaseFile == NULL) { | |
2894 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2895 return; | |
2896 } | |
2897 | |
2898 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2899 (JVM_MAXPATHLEN - 1)) { | |
2900 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2901 return; | |
2902 } | |
2903 | |
2904 char file_name[JVM_MAXPATHLEN]; | |
2905 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2906 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2907 | |
2908 fileStream fout(file_name); | |
2909 if (!fout.is_open()) { | |
2910 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2911 return; | |
2912 } | |
2913 | |
2914 outputStream* out = &fout; | |
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2915 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2916 out->cr(); |
2917 | |
1388 | 2918 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2919 out->cr(); |
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2920 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2921 _g1h->heap_region_iterate(&rcl); |
1044 | 2922 out->cr(); |
2923 | |
2924 gclog_or_tty->print_cr(" done"); | |
1388 | 2925 gclog_or_tty->flush(); |
342 | 2926 } |
2927 | |
1044 | 2928 #endif // PRODUCT |
2929 | |
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2930 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2931 // Note we are overriding the read-only view of the prev map here, via |
2932 // the cast. | |
2933 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2934 } |
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2935 |
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2936 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2937 _nextMarkBitMap->clearRange(mr); |
2938 } | |
2939 | |
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2940 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2941 clearRangePrevBitmap(mr); |
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2942 clearRangeNextBitmap(mr); |
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2943 } |
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2944 |
342 | 2945 HeapRegion* |
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2946 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2947 // "checkpoint" the finger |
2948 HeapWord* finger = _finger; | |
2949 | |
2950 // _heap_end will not change underneath our feet; it only changes at | |
2951 // yield points. | |
2952 while (finger < _heap_end) { | |
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2953 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2954 |
3771 | 2955 // Note on how this code handles humongous regions. In the |
2956 // normal case the finger will reach the start of a "starts | |
2957 // humongous" (SH) region. Its end will either be the end of the | |
2958 // last "continues humongous" (CH) region in the sequence, or the | |
2959 // standard end of the SH region (if the SH is the only region in | |
2960 // the sequence). That way claim_region() will skip over the CH | |
2961 // regions. However, there is a subtle race between a CM thread | |
2962 // executing this method and a mutator thread doing a humongous | |
2963 // object allocation. The two are not mutually exclusive as the CM | |
2964 // thread does not need to hold the Heap_lock when it gets | |
2965 // here. So there is a chance that claim_region() will come across | |
2966 // a free region that's in the progress of becoming a SH or a CH | |
2967 // region. In the former case, it will either | |
2968 // a) Miss the update to the region's end, in which case it will | |
2969 // visit every subsequent CH region, will find their bitmaps | |
2970 // empty, and do nothing, or | |
2971 // b) Will observe the update of the region's end (in which case | |
2972 // it will skip the subsequent CH regions). | |
2973 // If it comes across a region that suddenly becomes CH, the | |
2974 // scenario will be similar to b). So, the race between | |
2975 // claim_region() and a humongous object allocation might force us | |
2976 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2977 // iterations) but it should not introduce and correctness issues. | |
2978 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2979 HeapWord* bottom = curr_region->bottom(); |
2980 HeapWord* end = curr_region->end(); | |
2981 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2982 | |
3771 | 2983 if (verbose_low()) { |
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2984 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2985 "["PTR_FORMAT", "PTR_FORMAT"), " |
2986 "limit = "PTR_FORMAT, | |
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2987 worker_id, p2i(curr_region), p2i(bottom), p2i(end), p2i(limit)); |
3771 | 2988 } |
2989 | |
2990 // Is the gap between reading the finger and doing the CAS too long? | |
2991 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2992 if (res == finger) { |
2993 // we succeeded | |
2994 | |
2995 // notice that _finger == end cannot be guaranteed here since, | |
2996 // someone else might have moved the finger even further | |
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2997 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2998 |
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2999 if (verbose_low()) { |
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3000 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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3001 PTR_FORMAT, worker_id, p2i(curr_region)); |
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3002 } |
342 | 3003 |
3004 if (limit > bottom) { | |
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|
3005 if (verbose_low()) { |
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3006 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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|
3007 "returning it ", worker_id, p2i(curr_region)); |
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3008 } |
342 | 3009 return curr_region; |
3010 } else { | |
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|
3011 assert(limit == bottom, |
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|
3012 "the region limit should be at bottom"); |
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|
3013 if (verbose_low()) { |
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|
3014 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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|
3015 "returning NULL", worker_id, p2i(curr_region)); |
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3016 } |
342 | 3017 // we return NULL and the caller should try calling |
3018 // claim_region() again. | |
3019 return NULL; | |
3020 } | |
3021 } else { | |
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3022 assert(_finger > finger, "the finger should have moved forward"); |
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|
3023 if (verbose_low()) { |
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3024 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 3025 "global finger = "PTR_FORMAT", " |
3026 "our finger = "PTR_FORMAT, | |
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3027 worker_id, p2i(_finger), p2i(finger)); |
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3028 } |
342 | 3029 |
3030 // read it again | |
3031 finger = _finger; | |
3032 } | |
3033 } | |
3034 | |
3035 return NULL; | |
3036 } | |
3037 | |
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3038 #ifndef PRODUCT |
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3039 enum VerifyNoCSetOopsPhase { |
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3040 VerifyNoCSetOopsStack, |
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3041 VerifyNoCSetOopsQueues, |
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3042 VerifyNoCSetOopsSATBCompleted, |
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3043 VerifyNoCSetOopsSATBThread |
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3044 }; |
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3045 |
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3046 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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3047 private: |
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3048 G1CollectedHeap* _g1h; |
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3049 VerifyNoCSetOopsPhase _phase; |
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|
3050 int _info; |
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3051 |
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3052 const char* phase_str() { |
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3053 switch (_phase) { |
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3054 case VerifyNoCSetOopsStack: return "Stack"; |
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3055 case VerifyNoCSetOopsQueues: return "Queue"; |
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3056 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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3057 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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|
3058 default: ShouldNotReachHere(); |
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|
3059 } |
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3060 return NULL; |
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|
3061 } |
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|
3062 |
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3063 void do_object_work(oop obj) { |
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|
3064 guarantee(!_g1h->obj_in_cs(obj), |
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3065 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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3066 p2i((void*) obj), phase_str(), _info)); |
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3067 } |
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3068 |
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3069 public: |
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3070 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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3071 |
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|
3072 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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|
3073 _phase = phase; |
2ace1c4ee8da
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|
3074 _info = info; |
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diff
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|
3075 } |
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|
3076 |
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|
3077 virtual void do_oop(oop* p) { |
2ace1c4ee8da
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|
3078 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
3079 do_object_work(obj); |
2ace1c4ee8da
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diff
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|
3080 } |
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|
3081 |
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|
3082 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
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|
3083 // We should not come across narrow oops while scanning marking |
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|
3084 // stacks and SATB buffers. |
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diff
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|
3085 ShouldNotReachHere(); |
2ace1c4ee8da
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diff
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|
3086 } |
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|
3087 |
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|
3088 virtual void do_object(oop obj) { |
2ace1c4ee8da
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diff
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|
3089 do_object_work(obj); |
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|
3090 } |
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|
3091 }; |
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|
3092 |
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|
3093 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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|
3094 bool verify_enqueued_buffers, |
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|
3095 bool verify_thread_buffers, |
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|
3096 bool verify_fingers) { |
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|
3097 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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|
3098 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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|
3099 return; |
342 | 3100 } |
1835
4805b9f4779e
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|
3101 |
4787
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|
3102 VerifyNoCSetOopsClosure cl; |
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|
3103 |
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|
3104 if (verify_stacks) { |
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|
3105 // Verify entries on the global mark stack |
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|
3106 cl.set_phase(VerifyNoCSetOopsStack); |
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|
3107 _markStack.oops_do(&cl); |
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|
3108 |
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|
3109 // Verify entries on the task queues |
6862
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|
3110 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
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|
3111 cl.set_phase(VerifyNoCSetOopsQueues, i); |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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|
3112 CMTaskQueue* queue = _task_queues->queue(i); |
4787
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|
3113 queue->oops_do(&cl); |
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parents:
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|
3114 } |
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|
3115 } |
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parents:
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|
3116 |
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parents:
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|
3117 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
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|
3118 |
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|
3119 // Verify entries on the enqueued SATB buffers |
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|
3120 if (verify_enqueued_buffers) { |
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|
3121 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
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parents:
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|
3122 satb_qs.iterate_completed_buffers_read_only(&cl); |
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parents:
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|
3123 } |
2ace1c4ee8da
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|
3124 |
2ace1c4ee8da
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|
3125 // Verify entries on the per-thread SATB buffers |
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diff
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|
3126 if (verify_thread_buffers) { |
2ace1c4ee8da
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parents:
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diff
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|
3127 cl.set_phase(VerifyNoCSetOopsSATBThread); |
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parents:
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diff
changeset
|
3128 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
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johnc
parents:
1833
diff
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|
3129 } |
4805b9f4779e
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johnc
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1833
diff
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|
3130 |
4787
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|
3131 if (verify_fingers) { |
2ace1c4ee8da
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parents:
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diff
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|
3132 // Verify the global finger |
2ace1c4ee8da
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parents:
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diff
changeset
|
3133 HeapWord* global_finger = finger(); |
2ace1c4ee8da
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diff
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|
3134 if (global_finger != NULL && global_finger < _heap_end) { |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3135 // The global finger always points to a heap region boundary. We |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3136 // use heap_region_containing_raw() to get the containing region |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3137 // given that the global finger could be pointing to a free region |
2ace1c4ee8da
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parents:
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diff
changeset
|
3138 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3139 // happens, heap_region_containing() will return the bottom of the |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3140 // corresponding starts humongous region and the check below will |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3141 // not hold any more. |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3142 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3143 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3144 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3145 p2i(global_finger), HR_FORMAT_PARAMS(global_hr))); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3146 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3147 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3148 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3149 assert(parallel_marking_threads() <= _max_worker_id, "sanity"); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3150 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3151 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3152 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3153 if (task_finger != NULL && task_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3154 // See above note on the global finger verification. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3155 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3156 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3157 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3158 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3159 p2i(task_finger), HR_FORMAT_PARAMS(task_hr))); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3160 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3161 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3162 } |
342 | 3163 } |
4787
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
3164 #endif // PRODUCT |
342 | 3165 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3166 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3167 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3168 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3169 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3170 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3171 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3172 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3173 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3174 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3175 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3176 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3177 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3178 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3179 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3180 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3181 _cm_card_bm(cm_card_bm), _max_worker_id(max_worker_id) { } |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3182 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3183 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
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|
3184 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3185 // We will ignore these here and process them when their |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3186 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3187 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3188 // "starts humongous" region to have their bit set to 1 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3189 // since, due to the region chunking in the parallel region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3190 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3191 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3192 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3193 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3194 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3195 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3196 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3197 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3198 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3199 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3200 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3201 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3202 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3203 p2i(start), p2i(limit), p2i(hr->top()), p2i(hr->end()))); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3204 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3205 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3206 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3207 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3208 // NTAMS of this region has not been set so nothing to do. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3209 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3210 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3211 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3212 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3213 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3214 // 'end' *may* be just beyone the end of the heap (if hr is the last region) |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3215 assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3216 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3217 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3218 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3219 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3220 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3221 // If ntams is not card aligned then we bump card bitmap index |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3222 // for limit so that we get the all the cards spanned by |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3223 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3224 // Note: if this is the last region in the heap then ntams |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3225 // could be actually just beyond the end of the the heap; |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3226 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3227 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3228 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3229 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3230 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3231 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3232 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3233 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3234 // Aggregate the "stripe" in the count data associated with hr. |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3235 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3236 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3237 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3238 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3239 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3240 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3241 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3242 // Fetch the marked_bytes in this region for task i and |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3243 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3244 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3245 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3246 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3247 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3248 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3249 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3250 while (scan_idx < limit_idx) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3251 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3252 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3253 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3254 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3255 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3256 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3257 // parameter. It does, however, have an early exit if |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3258 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3259 // passed in for left offset here. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3260 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3261 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3262 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3263 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3264 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3265 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3266 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3267 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3268 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3269 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3270 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3271 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3272 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3273 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3274 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3275 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3276 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3277 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3278 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3279 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3280 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3281 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3282 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3283 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3284 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3285 uint max_worker_id, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3286 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3287 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3288 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3289 _max_worker_id(max_worker_id), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3290 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3291 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3292 void work(uint worker_id) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3293 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3294 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3295 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3296 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3297 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3298 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3299 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3300 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3301 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3302 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3303 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3304 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3305 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3306 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3307 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3308 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3309 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3310 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3311 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3312 _max_worker_id, n_workers); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3313 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3314 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3315 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3316 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3317 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3318 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3319 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3320 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3321 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
3322 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
3323 _g1h->reset_heap_region_claim_values(); |
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6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
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|
3324 } else { |
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6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3325 g1_par_agg_task.work(0); |
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parents:
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diff
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|
3326 } |
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6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3327 } |
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6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
3328 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
3329 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3330 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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changeset
|
3331 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3332 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3333 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3334 _card_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3335 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3336 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
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diff
changeset
|
3337 // of the final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3338 _region_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
3339 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
3340 uint max_regions = _g1h->max_regions(); |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
changeset
|
3341 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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|
3342 |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
3343 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3344 BitMap* task_card_bm = count_card_bitmap_for(i); |
d30fa85f9994
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changeset
|
3345 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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|
3346 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3347 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
d30fa85f9994
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changeset
|
3348 assert(marked_bytes_array != NULL, "uninitialized"); |
d30fa85f9994
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|
3349 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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diff
changeset
|
3350 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
d30fa85f9994
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diff
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|
3351 task_card_bm->clear(); |
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|
3352 } |
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|
3353 } |
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|
3354 |
342 | 3355 void ConcurrentMark::print_stats() { |
3356 if (verbose_stats()) { | |
3357 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3358 for (size_t i = 0; i < _active_tasks; ++i) { | |
3359 _tasks[i]->print_stats(); | |
3360 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3361 } | |
3362 } | |
3363 } | |
3364 | |
3365 // abandon current marking iteration due to a Full GC | |
3366 void ConcurrentMark::abort() { | |
20302
3bf2fc51186b
8048085: Aborting marking just before remark results in useless additional clearing of the next mark bitmap
tschatzl
parents:
20282
diff
changeset
|
3367 // Clear all marks in the next bitmap for the next marking cycle. This will allow us to skip the next |
3bf2fc51186b
8048085: Aborting marking just before remark results in useless additional clearing of the next mark bitmap
tschatzl
parents:
20282
diff
changeset
|
3368 // concurrent bitmap clearing. |
342 | 3369 _nextMarkBitMap->clearAll(); |
4836
d30fa85f9994
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|
3370 // Clear the liveness counting data |
d30fa85f9994
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changeset
|
3371 clear_all_count_data(); |
342 | 3372 // Empty mark stack |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
7397
diff
changeset
|
3373 reset_marking_state(); |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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diff
changeset
|
3374 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3375 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3376 } |
17949
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3377 _first_overflow_barrier_sync.abort(); |
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3378 _second_overflow_barrier_sync.abort(); |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
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diff
changeset
|
3379 const GCId& gc_id = _g1h->gc_tracer_cm()->gc_id(); |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
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diff
changeset
|
3380 if (!gc_id.is_undefined()) { |
0982ec23da03
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brutisso
parents:
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diff
changeset
|
3381 // We can do multiple full GCs before ConcurrentMarkThread::run() gets a chance |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
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diff
changeset
|
3382 // to detect that it was aborted. Only keep track of the first GC id that we aborted. |
0982ec23da03
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brutisso
parents:
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diff
changeset
|
3383 _aborted_gc_id = gc_id; |
0982ec23da03
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brutisso
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diff
changeset
|
3384 } |
342 | 3385 _has_aborted = true; |
3386 | |
3387 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3388 satb_mq_set.abandon_partial_marking(); | |
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3389 // This can be called either during or outside marking, we'll read |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3390 // the expected_active value from the SATB queue set. |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3391 satb_mq_set.set_active_all_threads( |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3392 false, /* new active value */ |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3393 satb_mq_set.is_active() /* expected_active */); |
10405 | 3394 |
3395 _g1h->trace_heap_after_concurrent_cycle(); | |
3396 _g1h->register_concurrent_cycle_end(); | |
342 | 3397 } |
3398 | |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3399 const GCId& ConcurrentMark::concurrent_gc_id() { |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3400 if (has_aborted()) { |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3401 return _aborted_gc_id; |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3402 } |
0982ec23da03
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brutisso
parents:
17950
diff
changeset
|
3403 return _g1h->gc_tracer_cm()->gc_id(); |
0982ec23da03
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brutisso
parents:
17950
diff
changeset
|
3404 } |
0982ec23da03
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brutisso
parents:
17950
diff
changeset
|
3405 |
342 | 3406 static void print_ms_time_info(const char* prefix, const char* name, |
3407 NumberSeq& ns) { | |
3408 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3409 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3410 if (ns.num() > 0) { | |
3411 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3412 prefix, ns.sd(), ns.maximum()); | |
3413 } | |
3414 } | |
3415 | |
3416 void ConcurrentMark::print_summary_info() { | |
3417 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3418 print_ms_time_info(" ", "init marks", _init_times); | |
3419 print_ms_time_info(" ", "remarks", _remark_times); | |
3420 { | |
3421 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3422 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3423 | |
3424 } | |
3425 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3426 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3427 _total_counting_time, | |
3428 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3429 (double)_cleanup_times.num() | |
3430 : 0.0)); | |
3431 if (G1ScrubRemSets) { | |
3432 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3433 _total_rs_scrub_time, | |
3434 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3435 (double)_cleanup_times.num() | |
3436 : 0.0)); | |
3437 } | |
3438 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3439 (_init_times.sum() + _remark_times.sum() + | |
3440 _cleanup_times.sum())/1000.0); | |
3441 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3442 "(%8.2f s marking).", |
342 | 3443 cmThread()->vtime_accum(), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3444 cmThread()->vtime_mark_accum()); |
342 | 3445 } |
3446 | |
1019 | 3447 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
8008
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
8006
diff
changeset
|
3448 if (use_parallel_marking_threads()) { |
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
8006
diff
changeset
|
3449 _parallel_workers->print_worker_threads_on(st); |
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
8006
diff
changeset
|
3450 } |
1019 | 3451 } |
3452 | |
9076
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3453 void ConcurrentMark::print_on_error(outputStream* st) const { |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3454 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3455 p2i(_prevMarkBitMap), p2i(_nextMarkBitMap)); |
9076
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3456 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3457 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3458 } |
7b835924c31c
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stefank
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8789
diff
changeset
|
3459 |
342 | 3460 // We take a break if someone is trying to stop the world. |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3461 bool ConcurrentMark::do_yield_check(uint worker_id) { |
20192 | 3462 if (SuspendibleThreadSet::should_yield()) { |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3463 if (worker_id == 0) { |
342 | 3464 _g1h->g1_policy()->record_concurrent_pause(); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
3465 } |
20192 | 3466 SuspendibleThreadSet::yield(); |
342 | 3467 return true; |
3468 } else { | |
3469 return false; | |
3470 } | |
3471 } | |
3472 | |
3473 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3474 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3475 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3476 } | |
3477 | |
3478 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3479 void* last) { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3480 return containing_card_is_marked(start) && |
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3481 containing_card_is_marked(last); |
342 | 3482 } |
3483 | |
3484 #ifndef PRODUCT | |
3485 // for debugging purposes | |
3486 void ConcurrentMark::print_finger() { | |
3487 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
17937
78bbf4d43a14
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drchase
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17844
diff
changeset
|
3488 p2i(_heap_start), p2i(_heap_end), p2i(_finger)); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
3489 for (uint i = 0; i < _max_worker_id; ++i) { |
17937
78bbf4d43a14
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drchase
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17844
diff
changeset
|
3490 gclog_or_tty->print(" %u: " PTR_FORMAT, i, p2i(_tasks[i]->finger())); |
342 | 3491 } |
17937
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drchase
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17844
diff
changeset
|
3492 gclog_or_tty->cr(); |
342 | 3493 } |
3494 #endif | |
3495 | |
3771 | 3496 void CMTask::scan_object(oop obj) { |
3497 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3498 | |
3499 if (_cm->verbose_high()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3500 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
17937
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drchase
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17844
diff
changeset
|
3501 _worker_id, p2i((void*) obj)); |
3771 | 3502 } |
3503 | |
3504 size_t obj_size = obj->size(); | |
3505 _words_scanned += obj_size; | |
3506 | |
3507 obj->oop_iterate(_cm_oop_closure); | |
3508 statsOnly( ++_objs_scanned ); | |
3509 check_limits(); | |
3510 } | |
3511 | |
342 | 3512 // Closure for iteration over bitmaps |
3513 class CMBitMapClosure : public BitMapClosure { | |
3514 private: | |
3515 // the bitmap that is being iterated over | |
3516 CMBitMap* _nextMarkBitMap; | |
3517 ConcurrentMark* _cm; | |
3518 CMTask* _task; | |
3519 | |
3520 public: | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
3521 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
2a0172480595
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4837
diff
changeset
|
3522 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3523 |
3524 bool do_bit(size_t offset) { | |
3525 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3526 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3527 assert( addr < _cm->finger(), "invariant"); |
342 | 3528 |
5988
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7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
3529 statsOnly( _task->increase_objs_found_on_bitmap() ); |
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
3530 assert(addr >= _task->finger(), "invariant"); |
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
3531 |
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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4837
diff
changeset
|
3532 // We move that task's local finger along. |
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3533 _task->move_finger_to(addr); |
342 | 3534 |
3535 _task->scan_object(oop(addr)); | |
3536 // we only partially drain the local queue and global stack | |
3537 _task->drain_local_queue(true); | |
3538 _task->drain_global_stack(true); | |
3539 | |
3540 // if the has_aborted flag has been raised, we need to bail out of | |
3541 // the iteration | |
3542 return !_task->has_aborted(); | |
3543 } | |
3544 }; | |
3545 | |
3771 | 3546 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3547 ConcurrentMark* cm, | |
3548 CMTask* task) | |
3549 : _g1h(g1h), _cm(cm), _task(task) { | |
3550 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3551 | |
3552 if (G1UseConcMarkReferenceProcessing) { | |
3979
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3553 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3554 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3555 } |
3771 | 3556 } |
342 | 3557 |
3558 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3559 // Separated the asserts so that we know which one fires. |
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3560 assert(hr != NULL, |
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3561 "claim_region() should have filtered out continues humongous regions"); |
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3562 assert(!hr->continuesHumongous(), |
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3563 "claim_region() should have filtered out continues humongous regions"); |
342 | 3564 |
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3565 if (_cm->verbose_low()) { |
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3566 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3567 _worker_id, p2i(hr)); |
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3568 } |
342 | 3569 |
3570 _curr_region = hr; | |
3571 _finger = hr->bottom(); | |
3572 update_region_limit(); | |
3573 } | |
3574 | |
3575 void CMTask::update_region_limit() { | |
3576 HeapRegion* hr = _curr_region; | |
3577 HeapWord* bottom = hr->bottom(); | |
3578 HeapWord* limit = hr->next_top_at_mark_start(); | |
3579 | |
3580 if (limit == bottom) { | |
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3581 if (_cm->verbose_low()) { |
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3582 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3583 "["PTR_FORMAT", "PTR_FORMAT")", |
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3584 _worker_id, p2i(bottom), p2i(limit)); |
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3585 } |
342 | 3586 // The region was collected underneath our feet. |
3587 // We set the finger to bottom to ensure that the bitmap | |
3588 // iteration that will follow this will not do anything. | |
3589 // (this is not a condition that holds when we set the region up, | |
3590 // as the region is not supposed to be empty in the first place) | |
3591 _finger = bottom; | |
3592 } else if (limit >= _region_limit) { | |
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3593 assert(limit >= _finger, "peace of mind"); |
342 | 3594 } else { |
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3595 assert(limit < _region_limit, "only way to get here"); |
342 | 3596 // This can happen under some pretty unusual circumstances. An |
3597 // evacuation pause empties the region underneath our feet (NTAMS | |
3598 // at bottom). We then do some allocation in the region (NTAMS | |
3599 // stays at bottom), followed by the region being used as a GC | |
3600 // alloc region (NTAMS will move to top() and the objects | |
3601 // originally below it will be grayed). All objects now marked in | |
3602 // the region are explicitly grayed, if below the global finger, | |
3603 // and we do not need in fact to scan anything else. So, we simply | |
3604 // set _finger to be limit to ensure that the bitmap iteration | |
3605 // doesn't do anything. | |
3606 _finger = limit; | |
3607 } | |
3608 | |
3609 _region_limit = limit; | |
3610 } | |
3611 | |
3612 void CMTask::giveup_current_region() { | |
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3613 assert(_curr_region != NULL, "invariant"); |
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3614 if (_cm->verbose_low()) { |
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3615 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3616 _worker_id, p2i(_curr_region)); |
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3617 } |
342 | 3618 clear_region_fields(); |
3619 } | |
3620 | |
3621 void CMTask::clear_region_fields() { | |
3622 // Values for these three fields that indicate that we're not | |
3623 // holding on to a region. | |
3624 _curr_region = NULL; | |
3625 _finger = NULL; | |
3626 _region_limit = NULL; | |
3627 } | |
3628 | |
3771 | 3629 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3630 if (cm_oop_closure == NULL) { | |
3631 assert(_cm_oop_closure != NULL, "invariant"); | |
3632 } else { | |
3633 assert(_cm_oop_closure == NULL, "invariant"); | |
3634 } | |
3635 _cm_oop_closure = cm_oop_closure; | |
3636 } | |
3637 | |
342 | 3638 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3639 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3640 |
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3641 if (_cm->verbose_low()) { |
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3642 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3643 } |
342 | 3644 |
3645 _nextMarkBitMap = nextMarkBitMap; | |
3646 clear_region_fields(); | |
3647 | |
3648 _calls = 0; | |
3649 _elapsed_time_ms = 0.0; | |
3650 _termination_time_ms = 0.0; | |
3651 _termination_start_time_ms = 0.0; | |
3652 | |
3653 #if _MARKING_STATS_ | |
3654 _local_pushes = 0; | |
3655 _local_pops = 0; | |
3656 _local_max_size = 0; | |
3657 _objs_scanned = 0; | |
3658 _global_pushes = 0; | |
3659 _global_pops = 0; | |
3660 _global_max_size = 0; | |
3661 _global_transfers_to = 0; | |
3662 _global_transfers_from = 0; | |
3663 _regions_claimed = 0; | |
3664 _objs_found_on_bitmap = 0; | |
3665 _satb_buffers_processed = 0; | |
3666 _steal_attempts = 0; | |
3667 _steals = 0; | |
3668 _aborted = 0; | |
3669 _aborted_overflow = 0; | |
3670 _aborted_cm_aborted = 0; | |
3671 _aborted_yield = 0; | |
3672 _aborted_timed_out = 0; | |
3673 _aborted_satb = 0; | |
3674 _aborted_termination = 0; | |
3675 #endif // _MARKING_STATS_ | |
3676 } | |
3677 | |
3678 bool CMTask::should_exit_termination() { | |
3679 regular_clock_call(); | |
3680 // This is called when we are in the termination protocol. We should | |
3681 // quit if, for some reason, this task wants to abort or the global | |
3682 // stack is not empty (this means that we can get work from it). | |
3683 return !_cm->mark_stack_empty() || has_aborted(); | |
3684 } | |
3685 | |
3686 void CMTask::reached_limit() { | |
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3687 assert(_words_scanned >= _words_scanned_limit || |
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3688 _refs_reached >= _refs_reached_limit , |
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3689 "shouldn't have been called otherwise"); |
342 | 3690 regular_clock_call(); |
3691 } | |
3692 | |
3693 void CMTask::regular_clock_call() { | |
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3694 if (has_aborted()) return; |
342 | 3695 |
3696 // First, we need to recalculate the words scanned and refs reached | |
3697 // limits for the next clock call. | |
3698 recalculate_limits(); | |
3699 | |
3700 // During the regular clock call we do the following | |
3701 | |
3702 // (1) If an overflow has been flagged, then we abort. | |
3703 if (_cm->has_overflown()) { | |
3704 set_has_aborted(); | |
3705 return; | |
3706 } | |
3707 | |
3708 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3709 // to check anything else. The other steps are only needed during | |
3710 // the concurrent marking phase. | |
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3711 if (!concurrent()) return; |
342 | 3712 |
3713 // (2) If marking has been aborted for Full GC, then we also abort. | |
3714 if (_cm->has_aborted()) { | |
3715 set_has_aborted(); | |
3716 statsOnly( ++_aborted_cm_aborted ); | |
3717 return; | |
3718 } | |
3719 | |
3720 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3721 | |
3722 // (3) If marking stats are enabled, then we update the step history. | |
3723 #if _MARKING_STATS_ | |
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3724 if (_words_scanned >= _words_scanned_limit) { |
342 | 3725 ++_clock_due_to_scanning; |
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3726 } |
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3727 if (_refs_reached >= _refs_reached_limit) { |
342 | 3728 ++_clock_due_to_marking; |
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3729 } |
342 | 3730 |
3731 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3732 _interval_start_time_ms = curr_time_ms; | |
3733 _all_clock_intervals_ms.add(last_interval_ms); | |
3734 | |
3735 if (_cm->verbose_medium()) { | |
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3736 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
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3737 "scanned = %d%s, refs reached = %d%s", |
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3738 _worker_id, last_interval_ms, |
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3739 _words_scanned, |
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3740 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3741 _refs_reached, |
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3742 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3743 } |
3744 #endif // _MARKING_STATS_ | |
3745 | |
3746 // (4) We check whether we should yield. If we have to, then we abort. | |
20192 | 3747 if (SuspendibleThreadSet::should_yield()) { |
342 | 3748 // We should yield. To do this we abort the task. The caller is |
3749 // responsible for yielding. | |
3750 set_has_aborted(); | |
3751 statsOnly( ++_aborted_yield ); | |
3752 return; | |
3753 } | |
3754 | |
3755 // (5) We check whether we've reached our time quota. If we have, | |
3756 // then we abort. | |
3757 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3758 if (elapsed_time_ms > _time_target_ms) { | |
3759 set_has_aborted(); | |
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3760 _has_timed_out = true; |
342 | 3761 statsOnly( ++_aborted_timed_out ); |
3762 return; | |
3763 } | |
3764 | |
3765 // (6) Finally, we check whether there are enough completed STAB | |
3766 // buffers available for processing. If there are, we abort. | |
3767 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3768 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3776
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3769 if (_cm->verbose_low()) { |
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3770 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3771 _worker_id); |
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3772 } |
342 | 3773 // we do need to process SATB buffers, we'll abort and restart |
3774 // the marking task to do so | |
3775 set_has_aborted(); | |
3776 statsOnly( ++_aborted_satb ); | |
3777 return; | |
3778 } | |
3779 } | |
3780 | |
3781 void CMTask::recalculate_limits() { | |
3782 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3783 _words_scanned_limit = _real_words_scanned_limit; | |
3784 | |
3785 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3786 _refs_reached_limit = _real_refs_reached_limit; | |
3787 } | |
3788 | |
3789 void CMTask::decrease_limits() { | |
3790 // This is called when we believe that we're going to do an infrequent | |
3791 // operation which will increase the per byte scanned cost (i.e. move | |
3792 // entries to/from the global stack). It basically tries to decrease the | |
3793 // scanning limit so that the clock is called earlier. | |
3794 | |
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3795 if (_cm->verbose_medium()) { |
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3796 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3797 } |
342 | 3798 |
3799 _words_scanned_limit = _real_words_scanned_limit - | |
3800 3 * words_scanned_period / 4; | |
3801 _refs_reached_limit = _real_refs_reached_limit - | |
3802 3 * refs_reached_period / 4; | |
3803 } | |
3804 | |
3805 void CMTask::move_entries_to_global_stack() { | |
3806 // local array where we'll store the entries that will be popped | |
3807 // from the local queue | |
3808 oop buffer[global_stack_transfer_size]; | |
3809 | |
3810 int n = 0; | |
3811 oop obj; | |
3812 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3813 buffer[n] = obj; | |
3814 ++n; | |
3815 } | |
3816 | |
3817 if (n > 0) { | |
3818 // we popped at least one entry from the local queue | |
3819 | |
3820 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3821 | |
3822 if (!_cm->mark_stack_push(buffer, n)) { | |
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3823 if (_cm->verbose_low()) { |
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3824 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3825 _worker_id); |
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3826 } |
342 | 3827 set_has_aborted(); |
3828 } else { | |
3829 // the transfer was successful | |
3830 | |
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3831 if (_cm->verbose_medium()) { |
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3832 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3833 _worker_id, n); |
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3834 } |
342 | 3835 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3836 if (tmp_size > _global_max_size) { |
342 | 3837 _global_max_size = tmp_size; |
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3838 } |
342 | 3839 _global_pushes += n ); |
3840 } | |
3841 } | |
3842 | |
3843 // this operation was quite expensive, so decrease the limits | |
3844 decrease_limits(); | |
3845 } | |
3846 | |
3847 void CMTask::get_entries_from_global_stack() { | |
3848 // local array where we'll store the entries that will be popped | |
3849 // from the global stack. | |
3850 oop buffer[global_stack_transfer_size]; | |
3851 int n; | |
3852 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3853 assert(n <= global_stack_transfer_size, |
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3854 "we should not pop more than the given limit"); |
342 | 3855 if (n > 0) { |
3856 // yes, we did actually pop at least one entry | |
3857 | |
3858 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3859 if (_cm->verbose_medium()) { |
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3860 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3861 _worker_id, n); |
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3862 } |
342 | 3863 for (int i = 0; i < n; ++i) { |
3864 bool success = _task_queue->push(buffer[i]); | |
3865 // We only call this when the local queue is empty or under a | |
3866 // given target limit. So, we do not expect this push to fail. | |
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3867 assert(success, "invariant"); |
342 | 3868 } |
3869 | |
3870 statsOnly( int tmp_size = _task_queue->size(); | |
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3871 if (tmp_size > _local_max_size) { |
342 | 3872 _local_max_size = tmp_size; |
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3873 } |
342 | 3874 _local_pushes += n ); |
3875 } | |
3876 | |
3877 // this operation was quite expensive, so decrease the limits | |
3878 decrease_limits(); | |
3879 } | |
3880 | |
3881 void CMTask::drain_local_queue(bool partially) { | |
3776
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3882 if (has_aborted()) return; |
342 | 3883 |
3884 // Decide what the target size is, depending whether we're going to | |
3885 // drain it partially (so that other tasks can steal if they run out | |
3886 // of things to do) or totally (at the very end). | |
3887 size_t target_size; | |
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3888 if (partially) { |
342 | 3889 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
3776
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3890 } else { |
342 | 3891 target_size = 0; |
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3892 } |
342 | 3893 |
3894 if (_task_queue->size() > target_size) { | |
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3895 if (_cm->verbose_high()) { |
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3896 gclog_or_tty->print_cr("[%u] draining local queue, target size = " SIZE_FORMAT, |
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3897 _worker_id, target_size); |
3776
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3898 } |
342 | 3899 |
3900 oop obj; | |
3901 bool ret = _task_queue->pop_local(obj); | |
3902 while (ret) { | |
3903 statsOnly( ++_local_pops ); | |
3904 | |
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3905 if (_cm->verbose_high()) { |
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3906 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
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3907 p2i((void*) obj)); |
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3908 } |
342 | 3909 |
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3910 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3911 assert(!_g1h->is_on_master_free_list( |
2152 | 3912 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3913 |
3914 scan_object(obj); | |
3915 | |
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3916 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3917 ret = false; |
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3918 } else { |
342 | 3919 ret = _task_queue->pop_local(obj); |
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3920 } |
342 | 3921 } |
3922 | |
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3923 if (_cm->verbose_high()) { |
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3924 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3925 _worker_id, _task_queue->size()); |
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3926 } |
342 | 3927 } |
3928 } | |
3929 | |
3930 void CMTask::drain_global_stack(bool partially) { | |
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3931 if (has_aborted()) return; |
342 | 3932 |
3933 // We have a policy to drain the local queue before we attempt to | |
3934 // drain the global stack. | |
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3935 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3936 |
3937 // Decide what the target size is, depending whether we're going to | |
3938 // drain it partially (so that other tasks can steal if they run out | |
3939 // of things to do) or totally (at the very end). Notice that, | |
3940 // because we move entries from the global stack in chunks or | |
3941 // because another task might be doing the same, we might in fact | |
3942 // drop below the target. But, this is not a problem. | |
3943 size_t target_size; | |
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3944 if (partially) { |
342 | 3945 target_size = _cm->partial_mark_stack_size_target(); |
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3946 } else { |
342 | 3947 target_size = 0; |
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3948 } |
342 | 3949 |
3950 if (_cm->mark_stack_size() > target_size) { | |
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3951 if (_cm->verbose_low()) { |
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3952 gclog_or_tty->print_cr("[%u] draining global_stack, target size " SIZE_FORMAT, |
6862
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3953 _worker_id, target_size); |
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3954 } |
342 | 3955 |
3956 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3957 get_entries_from_global_stack(); | |
3958 drain_local_queue(partially); | |
3959 } | |
3960 | |
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3961 if (_cm->verbose_low()) { |
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3962 gclog_or_tty->print_cr("[%u] drained global stack, size = " SIZE_FORMAT, |
6862
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3963 _worker_id, _cm->mark_stack_size()); |
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3964 } |
342 | 3965 } |
3966 } | |
3967 | |
3968 // SATB Queue has several assumptions on whether to call the par or | |
3969 // non-par versions of the methods. this is why some of the code is | |
3970 // replicated. We should really get rid of the single-threaded version | |
3971 // of the code to simplify things. | |
3972 void CMTask::drain_satb_buffers() { | |
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3973 if (has_aborted()) return; |
342 | 3974 |
3975 // We set this so that the regular clock knows that we're in the | |
3976 // middle of draining buffers and doesn't set the abort flag when it | |
3977 // notices that SATB buffers are available for draining. It'd be | |
3978 // very counter productive if it did that. :-) | |
3979 _draining_satb_buffers = true; | |
3980 | |
3981 CMObjectClosure oc(this); | |
3982 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3983 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3984 satb_mq_set.set_par_closure(_worker_id, &oc); |
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3985 } else { |
342 | 3986 satb_mq_set.set_closure(&oc); |
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3987 } |
342 | 3988 |
3989 // This keeps claiming and applying the closure to completed buffers | |
3990 // until we run out of buffers or we need to abort. | |
1833
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3991 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3992 while (!has_aborted() && |
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3993 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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3994 if (_cm->verbose_medium()) { |
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3995 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3996 } |
342 | 3997 statsOnly( ++_satb_buffers_processed ); |
3998 regular_clock_call(); | |
3999 } | |
4000 } else { | |
4001 while (!has_aborted() && | |
4002 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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4003 if (_cm->verbose_medium()) { |
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4004 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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4005 } |
342 | 4006 statsOnly( ++_satb_buffers_processed ); |
4007 regular_clock_call(); | |
4008 } | |
4009 } | |
4010 | |
4011 _draining_satb_buffers = false; | |
4012 | |
1023
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4013 assert(has_aborted() || |
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4014 concurrent() || |
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4015 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 4016 |
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4017 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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4018 satb_mq_set.set_par_closure(_worker_id, NULL); |
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4019 } else { |
342 | 4020 satb_mq_set.set_closure(NULL); |
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4021 } |
342 | 4022 |
4023 // again, this was a potentially expensive operation, decrease the | |
4024 // limits to get the regular clock call early | |
4025 decrease_limits(); | |
4026 } | |
4027 | |
4028 void CMTask::print_stats() { | |
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4029 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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4030 _worker_id, _calls); |
342 | 4031 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
4032 _elapsed_time_ms, _termination_time_ms); | |
4033 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4034 _step_times_ms.num(), _step_times_ms.avg(), | |
4035 _step_times_ms.sd()); | |
4036 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4037 _step_times_ms.maximum(), _step_times_ms.sum()); | |
4038 | |
4039 #if _MARKING_STATS_ | |
4040 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4041 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
4042 _all_clock_intervals_ms.sd()); | |
4043 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4044 _all_clock_intervals_ms.maximum(), | |
4045 _all_clock_intervals_ms.sum()); | |
4046 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
4047 _clock_due_to_scanning, _clock_due_to_marking); | |
4048 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
4049 _objs_scanned, _objs_found_on_bitmap); | |
4050 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
4051 _local_pushes, _local_pops, _local_max_size); | |
4052 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
4053 _global_pushes, _global_pops, _global_max_size); | |
4054 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
4055 _global_transfers_to,_global_transfers_from); | |
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4056 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 4057 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
4058 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
4059 _steal_attempts, _steals); | |
4060 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
4061 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
4062 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
4063 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
4064 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
4065 #endif // _MARKING_STATS_ | |
4066 } | |
4067 | |
4068 /***************************************************************************** | |
4069 | |
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4070 The do_marking_step(time_target_ms, ...) method is the building |
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4071 block of the parallel marking framework. It can be called in parallel |
342 | 4072 with other invocations of do_marking_step() on different tasks |
4073 (but only one per task, obviously) and concurrently with the | |
4074 mutator threads, or during remark, hence it eliminates the need | |
4075 for two versions of the code. When called during remark, it will | |
4076 pick up from where the task left off during the concurrent marking | |
4077 phase. Interestingly, tasks are also claimable during evacuation | |
4078 pauses too, since do_marking_step() ensures that it aborts before | |
4079 it needs to yield. | |
4080 | |
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4081 The data structures that it uses to do marking work are the |
342 | 4082 following: |
4083 | |
4084 (1) Marking Bitmap. If there are gray objects that appear only | |
4085 on the bitmap (this happens either when dealing with an overflow | |
4086 or when the initial marking phase has simply marked the roots | |
4087 and didn't push them on the stack), then tasks claim heap | |
4088 regions whose bitmap they then scan to find gray objects. A | |
4089 global finger indicates where the end of the last claimed region | |
4090 is. A local finger indicates how far into the region a task has | |
4091 scanned. The two fingers are used to determine how to gray an | |
4092 object (i.e. whether simply marking it is OK, as it will be | |
4093 visited by a task in the future, or whether it needs to be also | |
4094 pushed on a stack). | |
4095 | |
4096 (2) Local Queue. The local queue of the task which is accessed | |
4097 reasonably efficiently by the task. Other tasks can steal from | |
4098 it when they run out of work. Throughout the marking phase, a | |
4099 task attempts to keep its local queue short but not totally | |
4100 empty, so that entries are available for stealing by other | |
4101 tasks. Only when there is no more work, a task will totally | |
4102 drain its local queue. | |
4103 | |
4104 (3) Global Mark Stack. This handles local queue overflow. During | |
4105 marking only sets of entries are moved between it and the local | |
4106 queues, as access to it requires a mutex and more fine-grain | |
4107 interaction with it which might cause contention. If it | |
4108 overflows, then the marking phase should restart and iterate | |
4109 over the bitmap to identify gray objects. Throughout the marking | |
4110 phase, tasks attempt to keep the global mark stack at a small | |
4111 length but not totally empty, so that entries are available for | |
4112 popping by other tasks. Only when there is no more work, tasks | |
4113 will totally drain the global mark stack. | |
4114 | |
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4115 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 4116 made available. Buffers are regularly removed from this queue |
4117 and scanned for roots, so that the queue doesn't get too | |
4118 long. During remark, all completed buffers are processed, as | |
4119 well as the filled in parts of any uncompleted buffers. | |
4120 | |
4121 The do_marking_step() method tries to abort when the time target | |
4122 has been reached. There are a few other cases when the | |
4123 do_marking_step() method also aborts: | |
4124 | |
4125 (1) When the marking phase has been aborted (after a Full GC). | |
4126 | |
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4127 (2) When a global overflow (on the global stack) has been |
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4128 triggered. Before the task aborts, it will actually sync up with |
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4129 the other tasks to ensure that all the marking data structures |
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4130 (local queues, stacks, fingers etc.) are re-initialized so that |
5988
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4131 when do_marking_step() completes, the marking phase can |
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4132 immediately restart. |
342 | 4133 |
4134 (3) When enough completed SATB buffers are available. The | |
4135 do_marking_step() method only tries to drain SATB buffers right | |
4136 at the beginning. So, if enough buffers are available, the | |
4137 marking step aborts and the SATB buffers are processed at | |
4138 the beginning of the next invocation. | |
4139 | |
4140 (4) To yield. when we have to yield then we abort and yield | |
4141 right at the end of do_marking_step(). This saves us from a lot | |
4142 of hassle as, by yielding we might allow a Full GC. If this | |
4143 happens then objects will be compacted underneath our feet, the | |
4144 heap might shrink, etc. We save checking for this by just | |
4145 aborting and doing the yield right at the end. | |
4146 | |
4147 From the above it follows that the do_marking_step() method should | |
4148 be called in a loop (or, otherwise, regularly) until it completes. | |
4149 | |
4150 If a marking step completes without its has_aborted() flag being | |
4151 true, it means it has completed the current marking phase (and | |
4152 also all other marking tasks have done so and have all synced up). | |
4153 | |
4154 A method called regular_clock_call() is invoked "regularly" (in | |
4155 sub ms intervals) throughout marking. It is this clock method that | |
4156 checks all the abort conditions which were mentioned above and | |
4157 decides when the task should abort. A work-based scheme is used to | |
4158 trigger this clock method: when the number of object words the | |
4159 marking phase has scanned or the number of references the marking | |
4160 phase has visited reach a given limit. Additional invocations to | |
4161 the method clock have been planted in a few other strategic places | |
4162 too. The initial reason for the clock method was to avoid calling | |
4163 vtime too regularly, as it is quite expensive. So, once it was in | |
4164 place, it was natural to piggy-back all the other conditions on it | |
4165 too and not constantly check them throughout the code. | |
4166 | |
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4167 If do_termination is true then do_marking_step will enter its |
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4168 termination protocol. |
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4169 |
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4170 The value of is_serial must be true when do_marking_step is being |
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4171 called serially (i.e. by the VMThread) and do_marking_step should |
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4172 skip any synchronization in the termination and overflow code. |
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4173 Examples include the serial remark code and the serial reference |
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|
4174 processing closures. |
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4175 |
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4176 The value of is_serial must be false when do_marking_step is |
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4177 being called by any of the worker threads in a work gang. |
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4178 Examples include the concurrent marking code (CMMarkingTask), |
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|
4179 the MT remark code, and the MT reference processing closures. |
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4180 |
342 | 4181 *****************************************************************************/ |
4182 | |
2174
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4183 void CMTask::do_marking_step(double time_target_ms, |
8787
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4184 bool do_termination, |
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4185 bool is_serial) { |
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4186 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4187 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4188 |
342 | 4189 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
1023
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4190 assert(_task_queues != NULL, "invariant"); |
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4191 assert(_task_queue != NULL, "invariant"); |
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4192 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4193 |
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4194 assert(!_claimed, |
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4195 "only one thread should claim this task at any one time"); |
342 | 4196 |
4197 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4198 // possible for two threads to set the _claimed flag at the same | |
4199 // time. But it is only for debugging purposes anyway and it will | |
4200 // catch most problems. | |
4201 _claimed = true; | |
4202 | |
4203 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4204 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4205 | |
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4206 // If do_stealing is true then do_marking_step will attempt to |
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|
4207 // steal work from the other CMTasks. It only makes sense to |
fa08949fe0cb
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|
4208 // enable stealing when the termination protocol is enabled |
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4209 // and do_marking_step() is not being called serially. |
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|
4210 bool do_stealing = do_termination && !is_serial; |
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4211 |
342 | 4212 double diff_prediction_ms = |
4213 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4214 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4215 | |
4216 // set up the variables that are used in the work-based scheme to | |
4217 // call the regular clock method | |
4218 _words_scanned = 0; | |
4219 _refs_reached = 0; | |
4220 recalculate_limits(); | |
4221 | |
4222 // clear all flags | |
4223 clear_has_aborted(); | |
2174
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4224 _has_timed_out = false; |
342 | 4225 _draining_satb_buffers = false; |
4226 | |
4227 ++_calls; | |
4228 | |
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4229 if (_cm->verbose_low()) { |
6862
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|
4230 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4231 "target = %1.2lfms >>>>>>>>>>", |
6862
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4232 _worker_id, _calls, _time_target_ms); |
3776
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4233 } |
342 | 4234 |
4235 // Set up the bitmap and oop closures. Anything that uses them is | |
4236 // eventually called from this method, so it is OK to allocate these | |
4237 // statically. | |
4238 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4239 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4240 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4241 |
4242 if (_cm->has_overflown()) { | |
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4243 // This can happen if the mark stack overflows during a GC pause |
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4244 // and this task, after a yield point, restarts. We have to abort |
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4245 // as we need to get into the overflow protocol which happens |
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|
4246 // right at the end of this task. |
342 | 4247 set_has_aborted(); |
4248 } | |
4249 | |
4250 // First drain any available SATB buffers. After this, we will not | |
4251 // look at SATB buffers before the next invocation of this method. | |
4252 // If enough completed SATB buffers are queued up, the regular clock | |
4253 // will abort this task so that it restarts. | |
4254 drain_satb_buffers(); | |
4255 // ...then partially drain the local queue and the global stack | |
4256 drain_local_queue(true); | |
4257 drain_global_stack(true); | |
4258 | |
4259 do { | |
4260 if (!has_aborted() && _curr_region != NULL) { | |
4261 // This means that we're already holding on to a region. | |
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4262 assert(_finger != NULL, "if region is not NULL, then the finger " |
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|
4263 "should not be NULL either"); |
342 | 4264 |
4265 // We might have restarted this task after an evacuation pause | |
4266 // which might have evacuated the region we're holding on to | |
4267 // underneath our feet. Let's read its limit again to make sure | |
4268 // that we do not iterate over a region of the heap that | |
4269 // contains garbage (update_region_limit() will also move | |
4270 // _finger to the start of the region if it is found empty). | |
4271 update_region_limit(); | |
4272 // We will start from _finger not from the start of the region, | |
4273 // as we might be restarting this task after aborting half-way | |
4274 // through scanning this region. In this case, _finger points to | |
4275 // the address where we last found a marked object. If this is a | |
4276 // fresh region, _finger points to start(). | |
4277 MemRegion mr = MemRegion(_finger, _region_limit); | |
4278 | |
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4279 if (_cm->verbose_low()) { |
6862
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|
4280 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4281 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4282 "of region "HR_FORMAT, |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
4283 _worker_id, p2i(_finger), p2i(_region_limit), |
8039
5e401ef52ec0
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|
4284 HR_FORMAT_PARAMS(_curr_region)); |
3776
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|
4285 } |
342 | 4286 |
8039
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|
4287 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
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|
4288 "humongous regions should go around loop once only"); |
5e401ef52ec0
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|
4289 |
5e401ef52ec0
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|
4290 // Some special cases: |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4291 // If the memory region is empty, we can just give up the region. |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4292 // If the current region is humongous then we only need to check |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4293 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4294 // scan the object if it's live, and give up the region. |
5e401ef52ec0
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4295 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
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|
4296 // that is left. |
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|
4297 // If the iteration is successful, give up the region. |
8039
5e401ef52ec0
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|
4298 if (mr.is_empty()) { |
5e401ef52ec0
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|
4299 giveup_current_region(); |
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|
4300 regular_clock_call(); |
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|
4301 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
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|
4302 if (_nextMarkBitMap->isMarked(mr.start())) { |
5e401ef52ec0
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|
4303 // The object is marked - apply the closure |
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|
4304 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
5e401ef52ec0
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|
4305 bitmap_closure.do_bit(offset); |
5e401ef52ec0
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|
4306 } |
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|
4307 // Even if this task aborted while scanning the humongous object |
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|
4308 // we can (and should) give up the current region. |
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|
4309 giveup_current_region(); |
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|
4310 regular_clock_call(); |
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|
4311 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4312 giveup_current_region(); |
4313 regular_clock_call(); | |
4314 } else { | |
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4315 assert(has_aborted(), "currently the only way to do so"); |
342 | 4316 // The only way to abort the bitmap iteration is to return |
4317 // false from the do_bit() method. However, inside the | |
4318 // do_bit() method we move the _finger to point to the | |
4319 // object currently being looked at. So, if we bail out, we | |
4320 // have definitely set _finger to something non-null. | |
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|
4321 assert(_finger != NULL, "invariant"); |
342 | 4322 |
4323 // Region iteration was actually aborted. So now _finger | |
4324 // points to the address of the object we last scanned. If we | |
4325 // leave it there, when we restart this task, we will rescan | |
4326 // the object. It is easy to avoid this. We move the finger by | |
4327 // enough to point to the next possible object header (the | |
4328 // bitmap knows by how much we need to move it as it knows its | |
4329 // granularity). | |
1314
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6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
4330 assert(_finger < _region_limit, "invariant"); |
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|
4331 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
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diff
changeset
|
4332 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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diff
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|
4333 if (new_finger >= _region_limit) { |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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|
4334 giveup_current_region(); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
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|
4335 } else { |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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4837
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|
4336 move_finger_to(new_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4337 } |
342 | 4338 } |
4339 } | |
4340 // At this point we have either completed iterating over the | |
4341 // region we were holding on to, or we have aborted. | |
4342 | |
4343 // We then partially drain the local queue and the global stack. | |
4344 // (Do we really need this?) | |
4345 drain_local_queue(true); | |
4346 drain_global_stack(true); | |
4347 | |
4348 // Read the note on the claim_region() method on why it might | |
4349 // return NULL with potentially more regions available for | |
4350 // claiming and why we have to check out_of_regions() to determine | |
4351 // whether we're done or not. | |
4352 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4353 // We are going to try to claim a new region. We should have | |
4354 // given up on the previous one. | |
1023
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|
4355 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
4356 assert(_curr_region == NULL, "invariant"); |
11d4857fe5e1
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|
4357 assert(_finger == NULL, "invariant"); |
11d4857fe5e1
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|
4358 assert(_region_limit == NULL, "invariant"); |
3776
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|
4359 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4360 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4361 } |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4362 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4363 if (claimed_region != NULL) { |
4364 // Yes, we managed to claim one | |
4365 statsOnly( ++_regions_claimed ); | |
4366 | |
3776
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|
4367 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4368 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4369 "region "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
4370 _worker_id, p2i(claimed_region)); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4371 } |
342 | 4372 |
4373 setup_for_region(claimed_region); | |
1023
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|
4374 assert(_curr_region == claimed_region, "invariant"); |
342 | 4375 } |
4376 // It is important to call the regular clock here. It might take | |
4377 // a while to claim a region if, for example, we hit a large | |
4378 // block of empty regions. So we need to call the regular clock | |
4379 // method once round the loop to make sure it's called | |
4380 // frequently enough. | |
4381 regular_clock_call(); | |
4382 } | |
4383 | |
4384 if (!has_aborted() && _curr_region == NULL) { | |
1023
11d4857fe5e1
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|
4385 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4386 "at this point we should be out of regions"); |
342 | 4387 } |
4388 } while ( _curr_region != NULL && !has_aborted()); | |
4389 | |
4390 if (!has_aborted()) { | |
4391 // We cannot check whether the global stack is empty, since other | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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|
4392 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
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|
4393 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4394 "at this point we should be out of regions"); |
342 | 4395 |
3776
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|
4396 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4397 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
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|
4398 } |
342 | 4399 |
4400 // Try to reduce the number of available SATB buffers so that | |
4401 // remark has less work to do. | |
4402 drain_satb_buffers(); | |
4403 } | |
4404 | |
4405 // Since we've done everything else, we can now totally drain the | |
4406 // local queue and global stack. | |
4407 drain_local_queue(false); | |
4408 drain_global_stack(false); | |
4409 | |
4410 // Attempt at work stealing from other task's queues. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4411 if (do_stealing && !has_aborted()) { |
342 | 4412 // We have not aborted. This means that we have finished all that |
4413 // we could. Let's try to do some stealing... | |
4414 | |
4415 // We cannot check whether the global stack is empty, since other | |
5988
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|
4416 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
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parents:
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diff
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|
4417 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
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parents:
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diff
changeset
|
4418 "only way to reach here"); |
342 | 4419 |
3776
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|
4420 if (_cm->verbose_low()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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changeset
|
4421 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
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|
4422 } |
342 | 4423 |
4424 while (!has_aborted()) { | |
4425 oop obj; | |
4426 statsOnly( ++_steal_attempts ); | |
4427 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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changeset
|
4428 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
23d434c6290d
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tonyp
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changeset
|
4429 if (_cm->verbose_medium()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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diff
changeset
|
4430 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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changeset
|
4431 _worker_id, p2i((void*) obj)); |
3776
23d434c6290d
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|
4432 } |
342 | 4433 |
4434 statsOnly( ++_steals ); | |
4435 | |
1023
11d4857fe5e1
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|
4436 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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diff
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|
4437 "any stolen object should be marked"); |
342 | 4438 scan_object(obj); |
4439 | |
4440 // And since we're towards the end, let's totally drain the | |
4441 // local queue and global stack. | |
4442 drain_local_queue(false); | |
4443 drain_global_stack(false); | |
4444 } else { | |
4445 break; | |
4446 } | |
4447 } | |
4448 } | |
4449 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4450 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4451 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4452 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4453 if (_cm->force_overflow()->should_force()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4454 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4455 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4456 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4457 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
4458 |
342 | 4459 // We still haven't aborted. Now, let's try to get into the |
4460 // termination protocol. | |
2174
234761c55641
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2152
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|
4461 if (do_termination && !has_aborted()) { |
342 | 4462 // We cannot check whether the global stack is empty, since other |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
4463 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
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diff
changeset
|
4464 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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diff
changeset
|
4465 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
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changeset
|
4466 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4467 |
3776
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|
4468 if (_cm->verbose_low()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4469 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
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|
4470 } |
342 | 4471 |
4472 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
4473 |
342 | 4474 // The CMTask class also extends the TerminatorTerminator class, |
4475 // hence its should_exit_termination() method will also decide | |
4476 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4477 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4478 _cm->terminator()->offer_termination(this)); |
342 | 4479 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4480 _termination_time_ms += | |
4481 termination_end_time_ms - _termination_start_time_ms; | |
4482 | |
4483 if (finished) { | |
4484 // We're all done. | |
4485 | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4486 if (_worker_id == 0) { |
342 | 4487 // let's allow task 0 to do this |
4488 if (concurrent()) { | |
1023
11d4857fe5e1
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tonyp
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diff
changeset
|
4489 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4490 // we need to set this to false before the next |
4491 // safepoint. This way we ensure that the marking phase | |
4492 // doesn't observe any more heap expansions. | |
4493 _cm->clear_concurrent_marking_in_progress(); | |
4494 } | |
4495 } | |
4496 | |
4497 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
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1022
diff
changeset
|
4498 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
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diff
changeset
|
4499 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
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diff
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|
4500 // which one. |
11d4857fe5e1
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changeset
|
4501 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
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|
4502 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
4503 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
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|
4504 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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|
4505 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4506 |
3776
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|
4507 if (_cm->verbose_low()) { |
6862
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|
4508 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
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|
4509 } |
342 | 4510 } else { |
4511 // Apparently there's more work to do. Let's abort this task. It | |
4512 // will restart it and we can hopefully find more things to do. | |
4513 | |
3776
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changeset
|
4514 if (_cm->verbose_low()) { |
6862
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changeset
|
4515 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
8a5ea0a9ccc4
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|
4516 _worker_id); |
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|
4517 } |
342 | 4518 |
4519 set_has_aborted(); | |
4520 statsOnly( ++_aborted_termination ); | |
4521 } | |
4522 } | |
4523 | |
4524 // Mainly for debugging purposes to make sure that a pointer to the | |
4525 // closure which was statically allocated in this frame doesn't | |
4526 // escape it by accident. | |
3771 | 4527 set_cm_oop_closure(NULL); |
342 | 4528 double end_time_ms = os::elapsedVTime() * 1000.0; |
4529 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4530 // Update the step history. | |
4531 _step_times_ms.add(elapsed_time_ms); | |
4532 | |
4533 if (has_aborted()) { | |
4534 // The task was aborted for some reason. | |
4535 | |
4536 statsOnly( ++_aborted ); | |
4537 | |
2174
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|
4538 if (_has_timed_out) { |
342 | 4539 double diff_ms = elapsed_time_ms - _time_target_ms; |
4540 // Keep statistics of how well we did with respect to hitting | |
4541 // our target only if we actually timed out (if we aborted for | |
4542 // other reasons, then the results might get skewed). | |
4543 _marking_step_diffs_ms.add(diff_ms); | |
4544 } | |
4545 | |
4546 if (_cm->has_overflown()) { | |
4547 // This is the interesting one. We aborted because a global | |
4548 // overflow was raised. This means we have to restart the | |
4549 // marking phase and start iterating over regions. However, in | |
4550 // order to do this we have to make sure that all tasks stop | |
4551 // what they are doing and re-initialise in a safe manner. We | |
4552 // will achieve this with the use of two barrier sync points. | |
4553 | |
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|
4554 if (_cm->verbose_low()) { |
6862
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|
4555 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
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|
4556 } |
342 | 4557 |
8787
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|
4558 if (!is_serial) { |
fa08949fe0cb
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changeset
|
4559 // We only need to enter the sync barrier if being called |
fa08949fe0cb
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8744
diff
changeset
|
4560 // from a parallel context |
fa08949fe0cb
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|
4561 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
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diff
changeset
|
4562 |
fa08949fe0cb
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changeset
|
4563 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
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8744
diff
changeset
|
4564 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
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changeset
|
4565 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4566 // task 0 will clear the global data structures. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4567 } |
342 | 4568 |
4569 statsOnly( ++_aborted_overflow ); | |
4570 | |
4571 // We clear the local state of this task... | |
4572 clear_region_fields(); | |
4573 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4574 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4575 // ...and enter the second barrier. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4576 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4577 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4578 // At this point, if we're during the concurrent phase of |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4579 // marking, everything has been re-initialized and we're |
342 | 4580 // ready to restart. |
4581 } | |
4582 | |
4583 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4584 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4585 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4586 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4587 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4588 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4589 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4590 } |
342 | 4591 } |
4592 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4593 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4594 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4595 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4596 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4597 } |
342 | 4598 } |
4599 | |
4600 _claimed = false; | |
4601 } | |
4602 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4603 CMTask::CMTask(uint worker_id, |
342 | 4604 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4605 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4606 BitMap* card_bm, |
342 | 4607 CMTaskQueue* task_queue, |
4608 CMTaskQueueSet* task_queues) | |
4609 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4610 _worker_id(worker_id), _cm(cm), |
342 | 4611 _claimed(false), |
4612 _nextMarkBitMap(NULL), _hash_seed(17), | |
4613 _task_queue(task_queue), | |
4614 _task_queues(task_queues), | |
3771 | 4615 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4616 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4617 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4618 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4619 guarantee(task_queues != NULL, "invariant"); |
342 | 4620 |
4621 statsOnly( _clock_due_to_scanning = 0; | |
4622 _clock_due_to_marking = 0 ); | |
4623 | |
4624 _marking_step_diffs_ms.add(0.5); | |
4625 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4626 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4627 // These are formatting macros that are used below to ensure |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4628 // consistent formatting. The *_H_* versions are used to format the |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4629 // header for a particular value and they should be kept consistent |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4630 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4631 // the necessary white space (as a prefix) which makes them a bit |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4632 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4633 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4634 // All the output lines are prefixed with this string to be able to |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4635 // identify them easily in a large log file. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4636 #define G1PPRL_LINE_PREFIX "###" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4637 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4638 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4639 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4640 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4641 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4642 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4643 #endif // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4644 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4645 // For per-region info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4646 #define G1PPRL_TYPE_FORMAT " %-4s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4647 #define G1PPRL_TYPE_H_FORMAT " %4s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4648 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4649 #define G1PPRL_BYTE_H_FORMAT " %9s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4650 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4651 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4652 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4653 // For summary info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4654 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4655 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4656 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4657 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4658 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4659 G1PrintRegionLivenessInfoClosure:: |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4660 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4661 : _out(out), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4662 _total_used_bytes(0), _total_capacity_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4663 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4664 _hum_used_bytes(0), _hum_capacity_bytes(0), |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4665 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
12080 | 4666 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4667 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4668 MemRegion g1_committed = g1h->g1_committed(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4669 MemRegion g1_reserved = g1h->g1_reserved(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4670 double now = os::elapsedTime(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4671 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4672 // Print the header of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4673 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4674 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4675 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4676 G1PPRL_SUM_ADDR_FORMAT("committed") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4677 G1PPRL_SUM_ADDR_FORMAT("reserved") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4678 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4679 p2i(g1_committed.start()), p2i(g1_committed.end()), |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4680 p2i(g1_reserved.start()), p2i(g1_reserved.end()), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4681 HeapRegion::GrainBytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4682 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4683 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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10186
diff
changeset
|
4684 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4685 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4686 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4687 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4688 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4689 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4690 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4691 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4692 "type", "address-range", |
12080 | 4693 "used", "prev-live", "next-live", "gc-eff", |
4694 "remset", "code-roots"); | |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4695 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4696 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4697 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4698 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4699 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4700 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4701 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4702 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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10186
diff
changeset
|
4703 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4704 "", "", |
12080 | 4705 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
4706 "(bytes)", "(bytes)"); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4707 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4708 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4709 // It takes as a parameter a reference to one of the _hum_* fields, it |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4710 // deduces the corresponding value for a region in a humongous region |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4711 // series (either the region size, or what's left if the _hum_* field |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4712 // is < the region size), and updates the _hum_* field accordingly. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4713 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4714 size_t bytes = 0; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4715 // The > 0 check is to deal with the prev and next live bytes which |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4716 // could be 0. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4717 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4718 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4719 *hum_bytes -= bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4720 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4721 return bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4722 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4723 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4724 // It deduces the values for a region in a humongous region series |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4725 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4726 // that that _hum_* fields have already been set up from the "starts |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4727 // humongous" region and we visit the regions in address order. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4728 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4729 size_t* capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4730 size_t* prev_live_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4731 size_t* next_live_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4732 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4733 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4734 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4735 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4736 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4737 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4738 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4739 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4740 const char* type = ""; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4741 HeapWord* bottom = r->bottom(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4742 HeapWord* end = r->end(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4743 size_t capacity_bytes = r->capacity(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4744 size_t used_bytes = r->used(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4745 size_t prev_live_bytes = r->live_bytes(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4746 size_t next_live_bytes = r->next_live_bytes(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4747 double gc_eff = r->gc_efficiency(); |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4748 size_t remset_bytes = r->rem_set()->mem_size(); |
12080 | 4749 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
4750 | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4751 if (r->used() == 0) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4752 type = "FREE"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4753 } else if (r->is_survivor()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4754 type = "SURV"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4755 } else if (r->is_young()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4756 type = "EDEN"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4757 } else if (r->startsHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4758 type = "HUMS"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4759 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4760 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4761 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4762 "they should have been zeroed after the last time we used them"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4763 // Set up the _hum_* fields. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4764 _hum_capacity_bytes = capacity_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4765 _hum_used_bytes = used_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4766 _hum_prev_live_bytes = prev_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4767 _hum_next_live_bytes = next_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4768 get_hum_bytes(&used_bytes, &capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4769 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4770 end = bottom + HeapRegion::GrainWords; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4771 } else if (r->continuesHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4772 type = "HUMC"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4773 get_hum_bytes(&used_bytes, &capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4774 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4775 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4776 } else { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4777 type = "OLD"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4778 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4779 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4780 _total_used_bytes += used_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4781 _total_capacity_bytes += capacity_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4782 _total_prev_live_bytes += prev_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4783 _total_next_live_bytes += next_live_bytes; |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4784 _total_remset_bytes += remset_bytes; |
12080 | 4785 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4786 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4787 // Print a line for this particular region. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4788 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4789 G1PPRL_TYPE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4790 G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4791 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4792 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4793 G1PPRL_BYTE_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4794 G1PPRL_DOUBLE_FORMAT |
12080 | 4795 G1PPRL_BYTE_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4796 G1PPRL_BYTE_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4797 type, p2i(bottom), p2i(end), |
12080 | 4798 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
4799 remset_bytes, strong_code_roots_bytes); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4800 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4801 return false; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4802 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4803 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4804 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4805 // add static memory usages to remembered set sizes |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4806 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4807 // Print the footer of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4808 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4809 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4810 " SUMMARY" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4811 G1PPRL_SUM_MB_FORMAT("capacity") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4812 G1PPRL_SUM_MB_PERC_FORMAT("used") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4813 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4814 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
12080 | 4815 G1PPRL_SUM_MB_FORMAT("remset") |
4816 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4817 bytes_to_mb(_total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4818 bytes_to_mb(_total_used_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4819 perc(_total_used_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4820 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4821 perc(_total_prev_live_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4822 bytes_to_mb(_total_next_live_bytes), |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4823 perc(_total_next_live_bytes, _total_capacity_bytes), |
12080 | 4824 bytes_to_mb(_total_remset_bytes), |
4825 bytes_to_mb(_total_strong_code_roots_bytes)); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4826 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4827 } |