Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 17727:cfd4aac53239
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Reviewed-by: tschatzl, stefank, jmasa
author | brutisso |
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date | Mon, 27 Jan 2014 13:14:53 +0100 |
parents | cb7ec2423207 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
10405 | 39 #include "gc_implementation/shared/gcTimer.hpp" |
40 #include "gc_implementation/shared/gcTrace.hpp" | |
41 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 42 #include "memory/genOopClosures.inline.hpp" |
43 #include "memory/referencePolicy.hpp" | |
44 #include "memory/resourceArea.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "runtime/handles.inline.hpp" | |
47 #include "runtime/java.hpp" | |
6197 | 48 #include "services/memTracker.hpp" |
342 | 49 |
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50 // Concurrent marking bit map wrapper |
342 | 51 |
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52 CMBitMapRO::CMBitMapRO(int shifter) : |
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53 _bm(), |
342 | 54 _shifter(shifter) { |
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55 _bmStartWord = 0; |
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56 _bmWordSize = 0; |
342 | 57 } |
58 | |
59 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
60 HeapWord* limit) const { | |
61 // First we must round addr *up* to a possible object boundary. | |
62 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
63 HeapWordSize << _shifter); | |
64 size_t addrOffset = heapWordToOffset(addr); | |
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65 if (limit == NULL) { |
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66 limit = _bmStartWord + _bmWordSize; |
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67 } |
342 | 68 size_t limitOffset = heapWordToOffset(limit); |
69 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
70 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
71 assert(nextAddr >= addr, "get_next_one postcondition"); | |
72 assert(nextAddr == limit || isMarked(nextAddr), | |
73 "get_next_one postcondition"); | |
74 return nextAddr; | |
75 } | |
76 | |
77 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
78 HeapWord* limit) const { | |
79 size_t addrOffset = heapWordToOffset(addr); | |
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80 if (limit == NULL) { |
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81 limit = _bmStartWord + _bmWordSize; |
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82 } |
342 | 83 size_t limitOffset = heapWordToOffset(limit); |
84 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
85 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
86 assert(nextAddr >= addr, "get_next_one postcondition"); | |
87 assert(nextAddr == limit || !isMarked(nextAddr), | |
88 "get_next_one postcondition"); | |
89 return nextAddr; | |
90 } | |
91 | |
92 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
93 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
94 return (int) (diff >> _shifter); | |
95 } | |
96 | |
97 #ifndef PRODUCT | |
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98 bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
342 | 99 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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100 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 101 "size inconsistency"); |
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102 return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
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103 _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
342 | 104 } |
105 #endif | |
106 | |
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107 void CMBitMapRO::print_on_error(outputStream* st, const char* prefix) const { |
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108 _bm.print_on_error(st, prefix); |
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109 } |
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110 |
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111 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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112 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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113 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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114 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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115 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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116 if (!brs.is_reserved()) { |
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117 warning("ConcurrentMark marking bit map allocation failure"); |
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118 return false; |
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119 } |
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120 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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121 // For now we'll just commit all of the bit map up front. |
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122 // Later on we'll try to be more parsimonious with swap. |
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123 if (!_virtual_space.initialize(brs, brs.size())) { |
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124 warning("ConcurrentMark marking bit map backing store failure"); |
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125 return false; |
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126 } |
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127 assert(_virtual_space.committed_size() == brs.size(), |
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128 "didn't reserve backing store for all of concurrent marking bit map?"); |
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129 _bm.set_map((uintptr_t*)_virtual_space.low()); |
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130 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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131 _bmWordSize, "inconsistency in bit map sizing"); |
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132 _bm.set_size(_bmWordSize >> _shifter); |
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133 return true; |
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134 } |
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135 |
342 | 136 void CMBitMap::clearAll() { |
137 _bm.clear(); | |
138 return; | |
139 } | |
140 | |
141 void CMBitMap::markRange(MemRegion mr) { | |
142 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
143 assert(!mr.is_empty(), "unexpected empty region"); | |
144 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
145 ((HeapWord *) mr.end())), | |
146 "markRange memory region end is not card aligned"); | |
147 // convert address range into offset range | |
148 _bm.at_put_range(heapWordToOffset(mr.start()), | |
149 heapWordToOffset(mr.end()), true); | |
150 } | |
151 | |
152 void CMBitMap::clearRange(MemRegion mr) { | |
153 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
154 assert(!mr.is_empty(), "unexpected empty region"); | |
155 // convert address range into offset range | |
156 _bm.at_put_range(heapWordToOffset(mr.start()), | |
157 heapWordToOffset(mr.end()), false); | |
158 } | |
159 | |
160 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
161 HeapWord* end_addr) { | |
162 HeapWord* start = getNextMarkedWordAddress(addr); | |
163 start = MIN2(start, end_addr); | |
164 HeapWord* end = getNextUnmarkedWordAddress(start); | |
165 end = MIN2(end, end_addr); | |
166 assert(start <= end, "Consistency check"); | |
167 MemRegion mr(start, end); | |
168 if (!mr.is_empty()) { | |
169 clearRange(mr); | |
170 } | |
171 return mr; | |
172 } | |
173 | |
174 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
175 _base(NULL), _cm(cm) | |
176 #ifdef ASSERT | |
177 , _drain_in_progress(false) | |
178 , _drain_in_progress_yields(false) | |
179 #endif | |
180 {} | |
181 | |
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182 bool CMMarkStack::allocate(size_t capacity) { |
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183 // allocate a stack of the requisite depth |
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184 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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185 if (!rs.is_reserved()) { |
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186 warning("ConcurrentMark MarkStack allocation failure"); |
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187 return false; |
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188 } |
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189 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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190 if (!_virtual_space.initialize(rs, rs.size())) { |
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191 warning("ConcurrentMark MarkStack backing store failure"); |
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192 // Release the virtual memory reserved for the marking stack |
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193 rs.release(); |
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194 return false; |
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195 } |
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196 assert(_virtual_space.committed_size() == rs.size(), |
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197 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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198 _base = (oop*) _virtual_space.low(); |
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199 setEmpty(); |
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200 _capacity = (jint) capacity; |
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201 _saved_index = -1; |
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202 _should_expand = false; |
342 | 203 NOT_PRODUCT(_max_depth = 0); |
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204 return true; |
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205 } |
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206 |
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207 void CMMarkStack::expand() { |
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208 // Called, during remark, if we've overflown the marking stack during marking. |
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209 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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210 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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211 // Clear expansion flag |
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212 _should_expand = false; |
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213 if (_capacity == (jint) MarkStackSizeMax) { |
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214 if (PrintGCDetails && Verbose) { |
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215 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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216 } |
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217 return; |
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218 } |
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219 // Double capacity if possible |
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220 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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221 // Do not give up existing stack until we have managed to |
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222 // get the double capacity that we desired. |
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223 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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224 sizeof(oop))); |
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225 if (rs.is_reserved()) { |
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226 // Release the backing store associated with old stack |
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227 _virtual_space.release(); |
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228 // Reinitialize virtual space for new stack |
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229 if (!_virtual_space.initialize(rs, rs.size())) { |
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230 fatal("Not enough swap for expanded marking stack capacity"); |
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231 } |
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232 _base = (oop*)(_virtual_space.low()); |
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233 _index = 0; |
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234 _capacity = new_capacity; |
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235 } else { |
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236 if (PrintGCDetails && Verbose) { |
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237 // Failed to double capacity, continue; |
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238 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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239 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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240 _capacity / K, new_capacity / K); |
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241 } |
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242 } |
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243 } |
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244 |
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245 void CMMarkStack::set_should_expand() { |
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246 // If we're resetting the marking state because of an |
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247 // marking stack overflow, record that we should, if |
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248 // possible, expand the stack. |
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249 _should_expand = _cm->has_overflown(); |
342 | 250 } |
251 | |
252 CMMarkStack::~CMMarkStack() { | |
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253 if (_base != NULL) { |
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254 _base = NULL; |
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255 _virtual_space.release(); |
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256 } |
342 | 257 } |
258 | |
259 void CMMarkStack::par_push(oop ptr) { | |
260 while (true) { | |
261 if (isFull()) { | |
262 _overflow = true; | |
263 return; | |
264 } | |
265 // Otherwise... | |
266 jint index = _index; | |
267 jint next_index = index+1; | |
268 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
269 if (res == index) { | |
270 _base[index] = ptr; | |
271 // Note that we don't maintain this atomically. We could, but it | |
272 // doesn't seem necessary. | |
273 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
274 return; | |
275 } | |
276 // Otherwise, we need to try again. | |
277 } | |
278 } | |
279 | |
280 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
281 while (true) { | |
282 if (isFull()) { | |
283 _overflow = true; | |
284 return; | |
285 } | |
286 // Otherwise... | |
287 jint index = _index; | |
288 jint next_index = index + n; | |
289 if (next_index > _capacity) { | |
290 _overflow = true; | |
291 return; | |
292 } | |
293 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
294 if (res == index) { | |
295 for (int i = 0; i < n; i++) { | |
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296 int ind = index + i; |
342 | 297 assert(ind < _capacity, "By overflow test above."); |
298 _base[ind] = ptr_arr[i]; | |
299 } | |
300 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
301 return; | |
302 } | |
303 // Otherwise, we need to try again. | |
304 } | |
305 } | |
306 | |
307 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
308 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
309 jint start = _index; | |
310 jint next_index = start + n; | |
311 if (next_index > _capacity) { | |
312 _overflow = true; | |
313 return; | |
314 } | |
315 // Otherwise. | |
316 _index = next_index; | |
317 for (int i = 0; i < n; i++) { | |
318 int ind = start + i; | |
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319 assert(ind < _capacity, "By overflow test above."); |
342 | 320 _base[ind] = ptr_arr[i]; |
321 } | |
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322 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 323 } |
324 | |
325 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
326 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
327 jint index = _index; | |
328 if (index == 0) { | |
329 *n = 0; | |
330 return false; | |
331 } else { | |
332 int k = MIN2(max, index); | |
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333 jint new_ind = index - k; |
342 | 334 for (int j = 0; j < k; j++) { |
335 ptr_arr[j] = _base[new_ind + j]; | |
336 } | |
337 _index = new_ind; | |
338 *n = k; | |
339 return true; | |
340 } | |
341 } | |
342 | |
343 template<class OopClosureClass> | |
344 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
345 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
346 || SafepointSynchronize::is_at_safepoint(), | |
347 "Drain recursion must be yield-safe."); | |
348 bool res = true; | |
349 debug_only(_drain_in_progress = true); | |
350 debug_only(_drain_in_progress_yields = yield_after); | |
351 while (!isEmpty()) { | |
352 oop newOop = pop(); | |
353 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
354 assert(newOop->is_oop(), "Expected an oop"); | |
355 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
356 "only grey objects on this stack"); | |
357 newOop->oop_iterate(cl); | |
358 if (yield_after && _cm->do_yield_check()) { | |
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359 res = false; |
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360 break; |
342 | 361 } |
362 } | |
363 debug_only(_drain_in_progress = false); | |
364 return res; | |
365 } | |
366 | |
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367 void CMMarkStack::note_start_of_gc() { |
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368 assert(_saved_index == -1, |
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369 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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370 _saved_index = _index; |
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371 } |
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372 |
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373 void CMMarkStack::note_end_of_gc() { |
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374 // This is intentionally a guarantee, instead of an assert. If we |
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375 // accidentally add something to the mark stack during GC, it |
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376 // will be a correctness issue so it's better if we crash. we'll |
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377 // only check this once per GC anyway, so it won't be a performance |
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378 // issue in any way. |
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379 guarantee(_saved_index == _index, |
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380 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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381 _saved_index = -1; |
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382 } |
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383 |
342 | 384 void CMMarkStack::oops_do(OopClosure* f) { |
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385 assert(_saved_index == _index, |
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386 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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387 for (int i = 0; i < _index; i += 1) { |
342 | 388 f->do_oop(&_base[i]); |
389 } | |
390 } | |
391 | |
392 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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393 return _g1h->is_obj_ill(obj); |
342 | 394 } |
395 | |
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396 CMRootRegions::CMRootRegions() : |
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397 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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398 _should_abort(false), _next_survivor(NULL) { } |
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399 |
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400 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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401 _young_list = g1h->young_list(); |
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402 _cm = cm; |
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403 } |
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404 |
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405 void CMRootRegions::prepare_for_scan() { |
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406 assert(!scan_in_progress(), "pre-condition"); |
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407 |
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408 // Currently, only survivors can be root regions. |
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409 assert(_next_survivor == NULL, "pre-condition"); |
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410 _next_survivor = _young_list->first_survivor_region(); |
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411 _scan_in_progress = (_next_survivor != NULL); |
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412 _should_abort = false; |
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413 } |
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414 |
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415 HeapRegion* CMRootRegions::claim_next() { |
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416 if (_should_abort) { |
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417 // If someone has set the should_abort flag, we return NULL to |
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418 // force the caller to bail out of their loop. |
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419 return NULL; |
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420 } |
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421 |
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422 // Currently, only survivors can be root regions. |
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423 HeapRegion* res = _next_survivor; |
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424 if (res != NULL) { |
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425 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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426 // Read it again in case it changed while we were waiting for the lock. |
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427 res = _next_survivor; |
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428 if (res != NULL) { |
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429 if (res == _young_list->last_survivor_region()) { |
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430 // We just claimed the last survivor so store NULL to indicate |
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431 // that we're done. |
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432 _next_survivor = NULL; |
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433 } else { |
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434 _next_survivor = res->get_next_young_region(); |
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435 } |
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436 } else { |
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437 // Someone else claimed the last survivor while we were trying |
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438 // to take the lock so nothing else to do. |
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439 } |
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440 } |
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441 assert(res == NULL || res->is_survivor(), "post-condition"); |
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442 |
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443 return res; |
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444 } |
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445 |
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446 void CMRootRegions::scan_finished() { |
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447 assert(scan_in_progress(), "pre-condition"); |
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448 |
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449 // Currently, only survivors can be root regions. |
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450 if (!_should_abort) { |
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451 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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452 } |
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453 _next_survivor = NULL; |
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454 |
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455 { |
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456 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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457 _scan_in_progress = false; |
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458 RootRegionScan_lock->notify_all(); |
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459 } |
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460 } |
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461 |
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462 bool CMRootRegions::wait_until_scan_finished() { |
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463 if (!scan_in_progress()) return false; |
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464 |
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465 { |
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466 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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467 while (scan_in_progress()) { |
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468 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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469 } |
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470 } |
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471 return true; |
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472 } |
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473 |
342 | 474 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
475 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
476 #endif // _MSC_VER | |
477 | |
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478 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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479 return MAX2((n_par_threads + 2) / 4, 1U); |
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480 } |
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481 |
7397
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482 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
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483 _g1h(g1h), |
12229
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484 _markBitMap1(log2_intptr(MinObjAlignment)), |
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485 _markBitMap2(log2_intptr(MinObjAlignment)), |
342 | 486 _parallel_marking_threads(0), |
4095
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487 _max_parallel_marking_threads(0), |
342 | 488 _sleep_factor(0.0), |
489 _marking_task_overhead(1.0), | |
490 _cleanup_sleep_factor(0.0), | |
491 _cleanup_task_overhead(1.0), | |
2152 | 492 _cleanup_list("Cleanup List"), |
7397
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493 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
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494 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
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495 CardTableModRefBS::card_shift, |
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496 false /* in_resource_area*/), |
4836
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497 |
342 | 498 _prevMarkBitMap(&_markBitMap1), |
499 _nextMarkBitMap(&_markBitMap2), | |
500 | |
501 _markStack(this), | |
502 // _finger set in set_non_marking_state | |
503 | |
6862
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504 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 505 // _active_tasks set in set_non_marking_state |
506 // _tasks set inside the constructor | |
6862
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507 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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508 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 509 |
510 _has_overflown(false), | |
511 _concurrent(false), | |
619
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diff
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512 _has_aborted(false), |
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470
diff
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513 _restart_for_overflow(false), |
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514 _concurrent_marking_in_progress(false), |
342 | 515 |
516 // _verbose_level set below | |
517 | |
518 _init_times(), | |
519 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
520 _cleanup_times(), | |
521 _total_counting_time(0.0), | |
522 _total_rs_scrub_time(0.0), | |
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523 |
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524 _parallel_workers(NULL), |
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525 |
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526 _count_card_bitmaps(NULL), |
7397
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527 _count_marked_bytes(NULL), |
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528 _completed_initialization(false) { |
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529 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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530 if (verbose_level < no_verbose) { |
342 | 531 verbose_level = no_verbose; |
3776
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532 } |
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|
533 if (verbose_level > high_verbose) { |
342 | 534 verbose_level = high_verbose; |
3776
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|
535 } |
342 | 536 _verbose_level = verbose_level; |
537 | |
3776
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538 if (verbose_low()) { |
342 | 539 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
540 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
3776
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541 } |
342 | 542 |
7397
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543 if (!_markBitMap1.allocate(heap_rs)) { |
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544 warning("Failed to allocate first CM bit map"); |
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545 return; |
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|
546 } |
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547 if (!_markBitMap2.allocate(heap_rs)) { |
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548 warning("Failed to allocate second CM bit map"); |
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549 return; |
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550 } |
342 | 551 |
552 // Create & start a ConcurrentMark thread. | |
845
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553 _cmThread = new ConcurrentMarkThread(this); |
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554 assert(cmThread() != NULL, "CM Thread should have been created"); |
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555 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
13437
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556 if (_cmThread->osthread() == NULL) { |
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557 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
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558 } |
845
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559 |
342 | 560 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
7397
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561 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
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562 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 563 |
564 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 565 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 566 |
4837
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567 _root_regions.init(_g1h, this); |
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568 |
1284 | 569 if (ConcGCThreads > ParallelGCThreads) { |
7397
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570 warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") " |
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571 "than ParallelGCThreads (" UINT32_FORMAT ").", |
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572 ConcGCThreads, ParallelGCThreads); |
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573 return; |
342 | 574 } |
575 if (ParallelGCThreads == 0) { | |
576 // if we are not running with any parallel GC threads we will not | |
577 // spawn any marking threads either | |
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578 _parallel_marking_threads = 0; |
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579 _max_parallel_marking_threads = 0; |
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580 _sleep_factor = 0.0; |
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581 _marking_task_overhead = 1.0; |
342 | 582 } else { |
8006
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8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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583 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
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584 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 585 // if both are set |
586 _sleep_factor = 0.0; | |
587 _marking_task_overhead = 1.0; | |
751 | 588 } else if (G1MarkingOverheadPercent > 0) { |
8006
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589 // We will calculate the number of parallel marking threads based |
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590 // on a target overhead with respect to the soft real-time goal |
751 | 591 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 592 double overall_cm_overhead = |
751 | 593 (double) MaxGCPauseMillis * marking_overhead / |
594 (double) GCPauseIntervalMillis; | |
342 | 595 double cpu_ratio = 1.0 / (double) os::processor_count(); |
596 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
597 double marking_task_overhead = | |
598 overall_cm_overhead / marking_thread_num * | |
599 (double) os::processor_count(); | |
600 double sleep_factor = | |
601 (1.0 - marking_task_overhead) / marking_task_overhead; | |
602 | |
8006
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|
603 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 604 _sleep_factor = sleep_factor; |
605 _marking_task_overhead = marking_task_overhead; | |
606 } else { | |
8006
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607 // Calculate the number of parallel marking threads by scaling |
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608 // the number of parallel GC threads. |
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609 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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610 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 611 _sleep_factor = 0.0; |
612 _marking_task_overhead = 1.0; | |
613 } | |
614 | |
8006
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615 assert(ConcGCThreads > 0, "Should have been set"); |
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616 _parallel_marking_threads = (uint) ConcGCThreads; |
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617 _max_parallel_marking_threads = _parallel_marking_threads; |
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618 |
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619 if (parallel_marking_threads() > 1) { |
342 | 620 _cleanup_task_overhead = 1.0; |
3776
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621 } else { |
342 | 622 _cleanup_task_overhead = marking_task_overhead(); |
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623 } |
342 | 624 _cleanup_sleep_factor = |
625 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
626 | |
627 #if 0 | |
628 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
629 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
630 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
631 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
632 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
633 #endif | |
634 | |
1023
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635 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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636 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
4728
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637 _max_parallel_marking_threads, false, true); |
1833
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638 if (_parallel_workers == NULL) { |
342 | 639 vm_exit_during_initialization("Failed necessary allocation."); |
1833
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640 } else { |
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641 _parallel_workers->initialize_workers(); |
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642 } |
342 | 643 } |
644 | |
7397
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645 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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646 uintx mark_stack_size = |
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647 MIN2(MarkStackSizeMax, |
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648 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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649 // Verify that the calculated value for MarkStackSize is in range. |
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650 // It would be nice to use the private utility routine from Arguments. |
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651 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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652 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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653 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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654 mark_stack_size, 1, MarkStackSizeMax); |
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655 return; |
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656 } |
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657 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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658 } else { |
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659 // Verify MarkStackSize is in range. |
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660 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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661 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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662 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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663 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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664 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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665 MarkStackSize, 1, MarkStackSizeMax); |
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666 return; |
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667 } |
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668 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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669 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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670 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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671 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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672 MarkStackSize, MarkStackSizeMax); |
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673 return; |
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674 } |
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675 } |
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676 } |
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677 } |
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678 |
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679 if (!_markStack.allocate(MarkStackSize)) { |
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680 warning("Failed to allocate CM marking stack"); |
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681 return; |
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682 } |
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683 |
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684 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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685 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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686 |
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687 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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688 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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689 |
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690 BitMap::idx_t card_bm_size = _card_bm.size(); |
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|
691 |
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692 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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693 _active_tasks = _max_worker_id; |
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|
694 |
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695 size_t max_regions = (size_t) _g1h->max_regions(); |
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696 for (uint i = 0; i < _max_worker_id; ++i) { |
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697 CMTaskQueue* task_queue = new CMTaskQueue(); |
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698 task_queue->initialize(); |
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699 _task_queues->register_queue(i, task_queue); |
442f942757c0
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700 |
442f942757c0
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|
701 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
442f942757c0
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702 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
442f942757c0
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|
703 |
442f942757c0
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704 _tasks[i] = new CMTask(i, this, |
442f942757c0
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|
705 _count_marked_bytes[i], |
442f942757c0
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|
706 &_count_card_bitmaps[i], |
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707 task_queue, _task_queues); |
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|
708 |
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709 _accum_task_vtime[i] = 0.0; |
442f942757c0
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|
710 } |
442f942757c0
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|
711 |
442f942757c0
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712 // Calculate the card number for the bottom of the heap. Used |
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713 // in biasing indexes into the accounting card bitmaps. |
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|
714 _heap_bottom_card_num = |
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715 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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716 CardTableModRefBS::card_shift); |
442f942757c0
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|
717 |
442f942757c0
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|
718 // Clear all the liveness counting data |
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|
719 clear_all_count_data(); |
442f942757c0
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720 |
342 | 721 // so that the call below can read a sensible value |
7397
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722 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 723 set_non_marking_state(); |
7397
442f942757c0
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|
724 _completed_initialization = true; |
342 | 725 } |
726 | |
727 void ConcurrentMark::update_g1_committed(bool force) { | |
728 // If concurrent marking is not in progress, then we do not need to | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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diff
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|
729 // update _heap_end. |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
730 if (!concurrent_marking_in_progress() && !force) return; |
342 | 731 |
732 MemRegion committed = _g1h->g1_committed(); | |
1023
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|
733 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 734 HeapWord* new_end = committed.end(); |
735 if (new_end > _heap_end) { | |
736 // The heap has been expanded. | |
737 | |
738 _heap_end = new_end; | |
739 } | |
740 // Notice that the heap can also shrink. However, this only happens | |
741 // during a Full GC (at least currently) and the entire marking | |
742 // phase will bail out and the task will not be restarted. So, let's | |
743 // do nothing. | |
744 } | |
745 | |
746 void ConcurrentMark::reset() { | |
747 // Starting values for these two. This should be called in a STW | |
748 // phase. CM will be notified of any future g1_committed expansions | |
749 // will be at the end of evacuation pauses, when tasks are | |
750 // inactive. | |
751 MemRegion committed = _g1h->g1_committed(); | |
752 _heap_start = committed.start(); | |
753 _heap_end = committed.end(); | |
754 | |
1023
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755 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
756 assert(_heap_start != NULL, "heap bounds should look ok"); |
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|
757 assert(_heap_end != NULL, "heap bounds should look ok"); |
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|
758 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 759 |
7450
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8004816: G1: Kitchensink failures after marking stack changes
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760 // Reset all the marking data structures and any necessary flags |
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761 reset_marking_state(); |
342 | 762 |
3776
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|
763 if (verbose_low()) { |
342 | 764 gclog_or_tty->print_cr("[global] resetting"); |
3776
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765 } |
342 | 766 |
767 // We do reset all of them, since different phases will use | |
768 // different number of active threads. So, it's easiest to have all | |
769 // of them ready. | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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770 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 771 _tasks[i]->reset(_nextMarkBitMap); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
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|
772 } |
342 | 773 |
774 // we need this to make sure that the flag is on during the evac | |
775 // pause with initial mark piggy-backed | |
776 set_concurrent_marking_in_progress(); | |
777 } | |
778 | |
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779 |
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780 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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781 _markStack.set_should_expand(); |
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782 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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783 if (clear_overflow) { |
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784 clear_has_overflown(); |
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785 } else { |
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786 assert(has_overflown(), "pre-condition"); |
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787 } |
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788 _finger = _heap_start; |
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789 |
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790 for (uint i = 0; i < _max_worker_id; ++i) { |
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791 CMTaskQueue* queue = _task_queues->queue(i); |
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792 queue->set_empty(); |
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793 } |
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794 } |
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795 |
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796 void ConcurrentMark::set_concurrency(uint active_tasks) { |
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797 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 798 |
799 _active_tasks = active_tasks; | |
800 // Need to update the three data structures below according to the | |
801 // number of active threads for this phase. | |
802 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
803 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
804 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
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805 } |
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806 |
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807 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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808 set_concurrency(active_tasks); |
342 | 809 |
810 _concurrent = concurrent; | |
811 // We propagate this to all tasks, not just the active ones. | |
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812 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 813 _tasks[i]->set_concurrent(concurrent); |
814 | |
815 if (concurrent) { | |
816 set_concurrent_marking_in_progress(); | |
817 } else { | |
818 // We currently assume that the concurrent flag has been set to | |
819 // false before we start remark. At this point we should also be | |
820 // in a STW phase. | |
1023
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821 assert(!concurrent_marking_in_progress(), "invariant"); |
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822 assert(_finger == _heap_end, |
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823 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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824 _finger, _heap_end)); |
342 | 825 update_g1_committed(true); |
826 } | |
827 } | |
828 | |
829 void ConcurrentMark::set_non_marking_state() { | |
830 // We set the global marking state to some default values when we're | |
831 // not doing marking. | |
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832 reset_marking_state(); |
342 | 833 _active_tasks = 0; |
834 clear_concurrent_marking_in_progress(); | |
835 } | |
836 | |
837 ConcurrentMark::~ConcurrentMark() { | |
4735 | 838 // The ConcurrentMark instance is never freed. |
839 ShouldNotReachHere(); | |
342 | 840 } |
841 | |
842 void ConcurrentMark::clearNextBitmap() { | |
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843 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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844 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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845 |
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846 // Make sure that the concurrent mark thread looks to still be in |
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847 // the current cycle. |
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848 guarantee(cmThread()->during_cycle(), "invariant"); |
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849 |
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850 // We are finishing up the current cycle by clearing the next |
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851 // marking bitmap and getting it ready for the next cycle. During |
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852 // this time no other cycle can start. So, let's make sure that this |
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853 // is the case. |
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854 guarantee(!g1h->mark_in_progress(), "invariant"); |
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855 |
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856 // clear the mark bitmap (no grey objects to start with). |
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857 // We need to do this in chunks and offer to yield in between |
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858 // each chunk. |
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859 HeapWord* start = _nextMarkBitMap->startWord(); |
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860 HeapWord* end = _nextMarkBitMap->endWord(); |
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861 HeapWord* cur = start; |
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862 size_t chunkSize = M; |
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863 while (cur < end) { |
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864 HeapWord* next = cur + chunkSize; |
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865 if (next > end) { |
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866 next = end; |
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867 } |
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868 MemRegion mr(cur,next); |
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869 _nextMarkBitMap->clearRange(mr); |
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870 cur = next; |
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871 do_yield_check(); |
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872 |
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873 // Repeat the asserts from above. We'll do them as asserts here to |
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874 // minimize their overhead on the product. However, we'll have |
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875 // them as guarantees at the beginning / end of the bitmap |
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876 // clearing to get some checking in the product. |
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877 assert(cmThread()->during_cycle(), "invariant"); |
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878 assert(!g1h->mark_in_progress(), "invariant"); |
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879 } |
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880 |
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881 // Clear the liveness counting data |
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882 clear_all_count_data(); |
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883 |
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884 // Repeat the asserts from above. |
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885 guarantee(cmThread()->during_cycle(), "invariant"); |
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886 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 887 } |
888 | |
889 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
890 public: | |
891 bool doHeapRegion(HeapRegion* r) { | |
892 if (!r->continuesHumongous()) { | |
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893 r->note_start_of_marking(); |
342 | 894 } |
895 return false; | |
896 } | |
897 }; | |
898 | |
899 void ConcurrentMark::checkpointRootsInitialPre() { | |
900 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
901 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
902 | |
903 _has_aborted = false; | |
904 | |
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905 #ifndef PRODUCT |
1044 | 906 if (G1PrintReachableAtInitialMark) { |
1388 | 907 print_reachable("at-cycle-start", |
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908 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 909 } |
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910 #endif |
342 | 911 |
912 // Initialise marking structures. This has to be done in a STW phase. | |
913 reset(); | |
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914 |
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915 // For each region note start of marking. |
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916 NoteStartOfMarkHRClosure startcl; |
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917 g1h->heap_region_iterate(&startcl); |
342 | 918 } |
919 | |
920 | |
921 void ConcurrentMark::checkpointRootsInitialPost() { | |
922 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
923 | |
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924 // If we force an overflow during remark, the remark operation will |
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925 // actually abort and we'll restart concurrent marking. If we always |
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926 // force an oveflow during remark we'll never actually complete the |
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927 // marking phase. So, we initilize this here, at the start of the |
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928 // cycle, so that at the remaining overflow number will decrease at |
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929 // every remark and we'll eventually not need to cause one. |
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930 force_overflow_stw()->init(); |
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931 |
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932 // Start Concurrent Marking weak-reference discovery. |
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933 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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934 // enable ("weak") refs discovery |
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935 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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936 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 937 |
938 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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939 // This is the start of the marking cycle, we're expected all |
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940 // threads to have SATB queues with active set to false. |
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941 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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942 false /* expected_active */); |
342 | 943 |
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944 _root_regions.prepare_for_scan(); |
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945 |
342 | 946 // update_g1_committed() will be called at the end of an evac pause |
947 // when marking is on. So, it's also called at the end of the | |
948 // initial-mark pause to update the heap end, if the heap expands | |
949 // during it. No need to call it here. | |
950 } | |
951 | |
952 /* | |
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953 * Notice that in the next two methods, we actually leave the STS |
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954 * during the barrier sync and join it immediately afterwards. If we |
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955 * do not do this, the following deadlock can occur: one thread could |
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956 * be in the barrier sync code, waiting for the other thread to also |
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957 * sync up, whereas another one could be trying to yield, while also |
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958 * waiting for the other threads to sync up too. |
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959 * |
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960 * Note, however, that this code is also used during remark and in |
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961 * this case we should not attempt to leave / enter the STS, otherwise |
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962 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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963 * (product). So we should only leave / enter the STS if we are |
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964 * operating concurrently. |
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965 * |
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966 * Because the thread that does the sync barrier has left the STS, it |
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967 * is possible to be suspended for a Full GC or an evacuation pause |
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968 * could occur. This is actually safe, since the entering the sync |
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969 * barrier is one of the last things do_marking_step() does, and it |
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970 * doesn't manipulate any data structures afterwards. |
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971 */ |
342 | 972 |
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973 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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974 if (verbose_low()) { |
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975 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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976 } |
342 | 977 |
3316
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978 if (concurrent()) { |
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979 ConcurrentGCThread::stsLeave(); |
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980 } |
342 | 981 _first_overflow_barrier_sync.enter(); |
3316
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982 if (concurrent()) { |
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983 ConcurrentGCThread::stsJoin(); |
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984 } |
342 | 985 // at this point everyone should have synced up and not be doing any |
986 // more work | |
987 | |
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988 if (verbose_low()) { |
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989 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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990 } |
342 | 991 |
8788
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992 // If we're executing the concurrent phase of marking, reset the marking |
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993 // state; otherwise the marking state is reset after reference processing, |
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994 // during the remark pause. |
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995 // If we reset here as a result of an overflow during the remark we will |
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996 // see assertion failures from any subsequent set_concurrency_and_phase() |
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997 // calls. |
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998 if (concurrent()) { |
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999 // let the task associated with with worker 0 do this |
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1000 if (worker_id == 0) { |
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1001 // task 0 is responsible for clearing the global data structures |
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1002 // We should be here because of an overflow. During STW we should |
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1003 // not clear the overflow flag since we rely on it being true when |
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1004 // we exit this method to abort the pause and restart concurent |
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1005 // marking. |
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1006 reset_marking_state(true /* clear_overflow */); |
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1007 force_overflow()->update(); |
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1008 |
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1009 if (G1Log::fine()) { |
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1010 gclog_or_tty->date_stamp(PrintGCDateStamps); |
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1011 gclog_or_tty->stamp(PrintGCTimeStamps); |
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1012 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1013 } |
342 | 1014 } |
1015 } | |
1016 | |
1017 // after this, each task should reset its own data structures then | |
1018 // then go into the second barrier | |
1019 } | |
1020 | |
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1021 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1022 if (verbose_low()) { |
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1023 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1024 } |
342 | 1025 |
3316
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1026 if (concurrent()) { |
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1027 ConcurrentGCThread::stsLeave(); |
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1028 } |
342 | 1029 _second_overflow_barrier_sync.enter(); |
3316
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1030 if (concurrent()) { |
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1031 ConcurrentGCThread::stsJoin(); |
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1032 } |
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1033 // at this point everything should be re-initialized and ready to go |
342 | 1034 |
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1035 if (verbose_low()) { |
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1036 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1037 } |
342 | 1038 } |
1039 | |
3316
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1040 #ifndef PRODUCT |
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1041 void ForceOverflowSettings::init() { |
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1042 _num_remaining = G1ConcMarkForceOverflow; |
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1043 _force = false; |
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1044 update(); |
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1045 } |
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1046 |
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1047 void ForceOverflowSettings::update() { |
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1048 if (_num_remaining > 0) { |
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1049 _num_remaining -= 1; |
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1050 _force = true; |
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1051 } else { |
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1052 _force = false; |
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1053 } |
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1054 } |
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1055 |
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1056 bool ForceOverflowSettings::should_force() { |
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1057 if (_force) { |
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1058 _force = false; |
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1059 return true; |
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1060 } else { |
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1061 return false; |
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1062 } |
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1063 } |
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1064 #endif // !PRODUCT |
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1065 |
342 | 1066 class CMConcurrentMarkingTask: public AbstractGangTask { |
1067 private: | |
1068 ConcurrentMark* _cm; | |
1069 ConcurrentMarkThread* _cmt; | |
1070 | |
1071 public: | |
4728
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1072 void work(uint worker_id) { |
1023
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1073 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1074 "this should only be done by a conc GC thread"); |
1974
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1075 ResourceMark rm; |
342 | 1076 |
1077 double start_vtime = os::elapsedVTime(); | |
1078 | |
1079 ConcurrentGCThread::stsJoin(); | |
1080 | |
4728
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1081 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1082 CMTask* the_task = _cm->task(worker_id); |
342 | 1083 the_task->record_start_time(); |
1084 if (!_cm->has_aborted()) { | |
1085 do { | |
1086 double start_vtime_sec = os::elapsedVTime(); | |
1087 double start_time_sec = os::elapsedTime(); | |
2174
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1088 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1089 |
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1090 the_task->do_marking_step(mark_step_duration_ms, |
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1091 true /* do_termination */, |
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1092 false /* is_serial*/); |
2174
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1093 |
342 | 1094 double end_time_sec = os::elapsedTime(); |
1095 double end_vtime_sec = os::elapsedVTime(); | |
1096 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1097 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1098 _cm->clear_has_overflown(); | |
1099 | |
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1100 bool ret = _cm->do_yield_check(worker_id); |
342 | 1101 |
1102 jlong sleep_time_ms; | |
1103 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1104 sleep_time_ms = | |
1105 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1106 ConcurrentGCThread::stsLeave(); | |
1107 os::sleep(Thread::current(), sleep_time_ms, false); | |
1108 ConcurrentGCThread::stsJoin(); | |
1109 } | |
1110 double end_time2_sec = os::elapsedTime(); | |
1111 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1112 | |
1113 #if 0 | |
1114 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1115 "overhead %1.4lf", | |
1116 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1117 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1118 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1119 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1120 #endif | |
1121 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1122 } | |
1123 the_task->record_end_time(); | |
1023
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1124 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1125 |
1126 ConcurrentGCThread::stsLeave(); | |
1127 | |
1128 double end_vtime = os::elapsedVTime(); | |
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1129 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1130 } |
1131 | |
1132 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1133 ConcurrentMarkThread* cmt) : | |
1134 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1135 | |
1136 ~CMConcurrentMarkingTask() { } | |
1137 }; | |
1138 | |
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1139 // Calculates the number of active workers for a concurrent |
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1140 // phase. |
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1141 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1142 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1143 uint n_conc_workers = 0; |
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1144 if (!UseDynamicNumberOfGCThreads || |
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1145 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1146 !ForceDynamicNumberOfGCThreads)) { |
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1147 n_conc_workers = max_parallel_marking_threads(); |
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1148 } else { |
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1149 n_conc_workers = |
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1150 AdaptiveSizePolicy::calc_default_active_workers( |
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1151 max_parallel_marking_threads(), |
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1152 1, /* Minimum workers */ |
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1153 parallel_marking_threads(), |
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1154 Threads::number_of_non_daemon_threads()); |
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1155 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1156 // that scaling has already gone into "_max_parallel_marking_threads". |
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1157 } |
4711 | 1158 assert(n_conc_workers > 0, "Always need at least 1"); |
1159 return n_conc_workers; | |
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1160 } |
4711 | 1161 // If we are not running with any parallel GC threads we will not |
1162 // have spawned any marking threads either. Hence the number of | |
1163 // concurrent workers should be 0. | |
1164 return 0; | |
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1165 } |
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1166 |
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1167 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1168 // Currently, only survivors can be root regions. |
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1169 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1170 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1171 |
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1172 const uintx interval = PrefetchScanIntervalInBytes; |
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1173 HeapWord* curr = hr->bottom(); |
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1174 const HeapWord* end = hr->top(); |
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1175 while (curr < end) { |
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1176 Prefetch::read(curr, interval); |
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1177 oop obj = oop(curr); |
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1178 int size = obj->oop_iterate(&cl); |
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1179 assert(size == obj->size(), "sanity"); |
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1180 curr += size; |
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1181 } |
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1182 } |
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1183 |
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1184 class CMRootRegionScanTask : public AbstractGangTask { |
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1185 private: |
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1186 ConcurrentMark* _cm; |
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1187 |
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1188 public: |
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1189 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1190 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1191 |
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1192 void work(uint worker_id) { |
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1193 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1194 "this should only be done by a conc GC thread"); |
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1195 |
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1196 CMRootRegions* root_regions = _cm->root_regions(); |
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1197 HeapRegion* hr = root_regions->claim_next(); |
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1198 while (hr != NULL) { |
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1199 _cm->scanRootRegion(hr, worker_id); |
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1200 hr = root_regions->claim_next(); |
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1201 } |
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1202 } |
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1203 }; |
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1204 |
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1205 void ConcurrentMark::scanRootRegions() { |
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1206 // scan_in_progress() will have been set to true only if there was |
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1207 // at least one root region to scan. So, if it's false, we |
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1208 // should not attempt to do any further work. |
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1209 if (root_regions()->scan_in_progress()) { |
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1210 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1211 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1212 "Maximum number of marking threads exceeded"); |
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1213 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1214 |
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1215 CMRootRegionScanTask task(this); |
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1216 if (use_parallel_marking_threads()) { |
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1217 _parallel_workers->set_active_workers((int) active_workers); |
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1218 _parallel_workers->run_task(&task); |
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1219 } else { |
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1220 task.work(0); |
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1221 } |
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1222 |
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1223 // It's possible that has_aborted() is true here without actually |
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1224 // aborting the survivor scan earlier. This is OK as it's |
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1225 // mainly used for sanity checking. |
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1226 root_regions()->scan_finished(); |
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1227 } |
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1228 } |
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1229 |
342 | 1230 void ConcurrentMark::markFromRoots() { |
1231 // we might be tempted to assert that: | |
1232 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1233 // "inconsistent argument?"); | |
1234 // However that wouldn't be right, because it's possible that | |
1235 // a safepoint is indeed in progress as a younger generation | |
1236 // stop-the-world GC happens even as we mark in this generation. | |
1237 | |
1238 _restart_for_overflow = false; | |
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1239 force_overflow_conc()->init(); |
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1240 |
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1241 // _g1h has _n_par_threads |
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1242 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1243 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1244 "Maximum number of marking threads exceeded"); |
4711 | 1245 |
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1246 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1247 |
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1248 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1249 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1250 |
1251 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1252 if (use_parallel_marking_threads()) { |
4711 | 1253 _parallel_workers->set_active_workers((int)active_workers); |
1254 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1255 // and the decisions on that MT processing is made elsewhere. | |
1256 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1257 _parallel_workers->run_task(&markingTask); |
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1258 } else { |
342 | 1259 markingTask.work(0); |
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1260 } |
342 | 1261 print_stats(); |
1262 } | |
1263 | |
1264 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1265 // world is stopped at this checkpoint | |
1266 assert(SafepointSynchronize::is_at_safepoint(), | |
1267 "world should be stopped"); | |
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1268 |
342 | 1269 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1270 | |
1271 // If a full collection has happened, we shouldn't do this. | |
1272 if (has_aborted()) { | |
1273 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1274 return; | |
1275 } | |
1276 | |
2125
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1277 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1278 |
845
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1279 if (VerifyDuringGC) { |
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1280 HandleMark hm; // handle scope |
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1281 Universe::heap()->prepare_for_verify(); |
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1282 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1283 " VerifyDuringGC:(before)"); |
845
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1284 } |
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1285 |
342 | 1286 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1287 g1p->record_concurrent_mark_remark_start(); | |
1288 | |
1289 double start = os::elapsedTime(); | |
1290 | |
1291 checkpointRootsFinalWork(); | |
1292 | |
1293 double mark_work_end = os::elapsedTime(); | |
1294 | |
1295 weakRefsWork(clear_all_soft_refs); | |
1296 | |
1297 if (has_overflown()) { | |
1298 // Oops. We overflowed. Restart concurrent marking. | |
1299 _restart_for_overflow = true; | |
8789
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1300 if (G1TraceMarkStackOverflow) { |
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1301 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1302 } |
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1303 |
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1304 // Verify the heap w.r.t. the previous marking bitmap. |
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1305 if (VerifyDuringGC) { |
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1306 HandleMark hm; // handle scope |
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1307 Universe::heap()->prepare_for_verify(); |
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1308 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1309 " VerifyDuringGC:(overflow)"); |
8789
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1310 } |
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1311 |
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1312 // Clear the marking state because we will be restarting |
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1313 // marking due to overflowing the global mark stack. |
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1314 reset_marking_state(); |
342 | 1315 } else { |
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1316 // Aggregate the per-task counting data that we have accumulated |
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1317 // while marking. |
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1318 aggregate_count_data(); |
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1319 |
2149 | 1320 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1321 // We're done with marking. |
1317
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1322 // This is the end of the marking cycle, we're expected all |
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1323 // threads to have SATB queues with active set to true. |
2149 | 1324 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1325 true /* expected_active */); | |
811 | 1326 |
1327 if (VerifyDuringGC) { | |
845
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1328 HandleMark hm; // handle scope |
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1329 Universe::heap()->prepare_for_verify(); |
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1330 Universe::verify(VerifyOption_G1UseNextMarking, |
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1331 " VerifyDuringGC:(after)"); |
811 | 1332 } |
2174
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1333 assert(!restart_for_overflow(), "sanity"); |
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1334 // Completely reset the marking state since marking completed |
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1335 set_non_marking_state(); |
2174
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1336 } |
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1337 |
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1338 // Expand the marking stack, if we have to and if we can. |
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1339 if (_markStack.should_expand()) { |
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1340 _markStack.expand(); |
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1341 } |
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1342 |
342 | 1343 // Statistics |
1344 double now = os::elapsedTime(); | |
1345 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1346 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1347 _remark_times.add((now - start) * 1000.0); | |
1348 | |
1349 g1p->record_concurrent_mark_remark_end(); | |
10405 | 1350 |
1351 G1CMIsAliveClosure is_alive(g1h); | |
1352 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
342 | 1353 } |
1354 | |
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1355 // Base class of the closures that finalize and verify the |
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1356 // liveness counting data. |
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1357 class CMCountDataClosureBase: public HeapRegionClosure { |
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1358 protected: |
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1359 G1CollectedHeap* _g1h; |
342 | 1360 ConcurrentMark* _cm; |
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1361 CardTableModRefBS* _ct_bs; |
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1362 |
342 | 1363 BitMap* _region_bm; |
1364 BitMap* _card_bm; | |
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1365 |
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1366 // Takes a region that's not empty (i.e., it has at least one |
829 | 1367 // live object in it and sets its corresponding bit on the region |
1368 // bitmap to 1. If the region is "starts humongous" it will also set | |
1369 // to 1 the bits on the region bitmap that correspond to its | |
1370 // associated "continues humongous" regions. | |
1371 void set_bit_for_region(HeapRegion* hr) { | |
1372 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1373 | |
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1374 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1375 if (!hr->startsHumongous()) { |
1376 // Normal (non-humongous) case: just set the bit. | |
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1377 _region_bm->par_at_put(index, true); |
829 | 1378 } else { |
1379 // Starts humongous case: calculate how many regions are part of | |
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1380 // this humongous region and then set the bit range. |
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1381 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
6010
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1382 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1383 } |
1384 } | |
1385 | |
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1386 public: |
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1387 CMCountDataClosureBase(G1CollectedHeap* g1h, |
6027
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1388 BitMap* region_bm, BitMap* card_bm): |
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1389 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1390 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1391 _region_bm(region_bm), _card_bm(card_bm) { } |
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1392 }; |
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1393 |
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1394 // Closure that calculates the # live objects per region. Used |
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1395 // for verification purposes during the cleanup pause. |
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1396 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1397 CMBitMapRO* _bm; |
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1398 size_t _region_marked_bytes; |
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1399 |
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1400 public: |
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1401 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1402 BitMap* region_bm, BitMap* card_bm) : |
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1403 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1404 _bm(bm), _region_marked_bytes(0) { } |
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1405 |
342 | 1406 bool doHeapRegion(HeapRegion* hr) { |
1407 | |
639 | 1408 if (hr->continuesHumongous()) { |
829 | 1409 // We will ignore these here and process them when their |
1410 // associated "starts humongous" region is processed (see | |
1411 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1412 // associated "starts humongous" region to have their bit set to | |
1413 // 1 since, due to the region chunking in the parallel region | |
1414 // iteration, a "continues humongous" region might be visited | |
1415 // before its associated "starts humongous". | |
639 | 1416 return false; |
1417 } | |
342 | 1418 |
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1419 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1420 HeapWord* start = hr->bottom(); |
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1421 |
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1422 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1423 err_msg("Preconditions not met - " |
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1424 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1425 start, ntams, hr->end())); |
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1426 |
342 | 1427 // Find the first marked object at or after "start". |
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1428 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1429 |
342 | 1430 size_t marked_bytes = 0; |
1431 | |
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1432 while (start < ntams) { |
342 | 1433 oop obj = oop(start); |
1434 int obj_sz = obj->size(); | |
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1435 HeapWord* obj_end = start + obj_sz; |
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1436 |
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1437 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1438 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1439 |
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1440 // Note: if we're looking at the last region in heap - obj_end |
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1441 // could be actually just beyond the end of the heap; end_idx |
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1442 // will then correspond to a (non-existent) card that is also |
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1443 // just beyond the heap. |
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1444 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1445 // end of object is not card aligned - increment to cover |
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1446 // all the cards spanned by the object |
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1447 end_idx += 1; |
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1448 } |
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1449 |
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1450 // Set the bits in the card BM for the cards spanned by this object. |
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1451 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1452 |
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1453 // Add the size of this object to the number of marked bytes. |
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1454 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1455 |
342 | 1456 // Find the next marked object after this one. |
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1457 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1458 } |
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1459 |
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1460 // Mark the allocated-since-marking portion... |
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1461 HeapWord* top = hr->top(); |
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1462 if (ntams < top) { |
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1463 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1464 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1465 |
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1466 // Note: if we're looking at the last region in heap - top |
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1467 // could be actually just beyond the end of the heap; end_idx |
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1468 // will then correspond to a (non-existent) card that is also |
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1469 // just beyond the heap. |
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1470 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1471 // end of object is not card aligned - increment to cover |
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1472 // all the cards spanned by the object |
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1473 end_idx += 1; |
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1474 } |
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1475 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1476 |
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1477 // This definitely means the region has live objects. |
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1478 set_bit_for_region(hr); |
342 | 1479 } |
1480 | |
1481 // Update the live region bitmap. | |
1482 if (marked_bytes > 0) { | |
829 | 1483 set_bit_for_region(hr); |
342 | 1484 } |
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1485 |
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1486 // Set the marked bytes for the current region so that |
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1487 // it can be queried by a calling verificiation routine |
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1488 _region_marked_bytes = marked_bytes; |
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1489 |
342 | 1490 return false; |
1491 } | |
1492 | |
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1493 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1494 }; |
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1495 |
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1496 // Heap region closure used for verifying the counting data |
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1497 // that was accumulated concurrently and aggregated during |
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1498 // the remark pause. This closure is applied to the heap |
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1499 // regions during the STW cleanup pause. |
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1500 |
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1501 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1502 G1CollectedHeap* _g1h; |
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1503 ConcurrentMark* _cm; |
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1504 CalcLiveObjectsClosure _calc_cl; |
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1505 BitMap* _region_bm; // Region BM to be verified |
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1506 BitMap* _card_bm; // Card BM to be verified |
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1507 bool _verbose; // verbose output? |
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1508 |
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1509 BitMap* _exp_region_bm; // Expected Region BM values |
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1510 BitMap* _exp_card_bm; // Expected card BM values |
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1511 |
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1512 int _failures; |
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1513 |
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1514 public: |
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1515 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1516 BitMap* region_bm, |
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1517 BitMap* card_bm, |
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1518 BitMap* exp_region_bm, |
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1519 BitMap* exp_card_bm, |
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1520 bool verbose) : |
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1521 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1522 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
4836
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1523 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1524 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1525 _failures(0) { } |
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1526 |
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1527 int failures() const { return _failures; } |
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1528 |
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1529 bool doHeapRegion(HeapRegion* hr) { |
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1530 if (hr->continuesHumongous()) { |
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1531 // We will ignore these here and process them when their |
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1532 // associated "starts humongous" region is processed (see |
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1533 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1534 // associated "starts humongous" region to have their bit set to |
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1535 // 1 since, due to the region chunking in the parallel region |
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1536 // iteration, a "continues humongous" region might be visited |
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1537 // before its associated "starts humongous". |
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1538 return false; |
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|
1539 } |
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|
1540 |
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1541 int failures = 0; |
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1542 |
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1543 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1544 // this region and set the corresponding bits in the expected region |
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1545 // and card bitmaps. |
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1546 bool res = _calc_cl.doHeapRegion(hr); |
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1547 assert(res == false, "should be continuing"); |
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|
1548 |
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1549 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1550 Mutex::_no_safepoint_check_flag); |
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|
1551 |
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1552 // Verify the marked bytes for this region. |
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1553 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1554 size_t act_marked_bytes = hr->next_marked_bytes(); |
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|
1555 |
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|
1556 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1557 // we have missed accounting some objects during the actual marking. |
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|
1558 if (exp_marked_bytes > act_marked_bytes) { |
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|
1559 if (_verbose) { |
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|
1560 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1561 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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|
1562 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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|
1563 } |
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|
1564 failures += 1; |
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|
1565 } |
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|
1566 |
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|
1567 // Verify the bit, for this region, in the actual and expected |
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1568 // (which was just calculated) region bit maps. |
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1569 // We're not OK if the bit in the calculated expected region |
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1570 // bitmap is set and the bit in the actual region bitmap is not. |
6010
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1571 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
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1572 |
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|
1573 bool expected = _exp_region_bm->at(index); |
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1574 bool actual = _region_bm->at(index); |
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1575 if (expected && !actual) { |
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1576 if (_verbose) { |
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1577 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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|
1578 "expected: %s, actual: %s", |
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|
1579 hr->hrs_index(), |
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|
1580 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1581 } |
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1582 failures += 1; |
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1583 } |
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|
1584 |
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1585 // Verify that the card bit maps for the cards spanned by the current |
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1586 // region match. We have an error if we have a set bit in the expected |
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1587 // bit map and the corresponding bit in the actual bitmap is not set. |
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1588 |
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1589 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1590 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1591 |
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1592 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1593 expected = _exp_card_bm->at(i); |
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1594 actual = _card_bm->at(i); |
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|
1595 |
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1596 if (expected && !actual) { |
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|
1597 if (_verbose) { |
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1598 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1599 "expected: %s, actual: %s", |
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1600 hr->hrs_index(), i, |
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1601 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1602 } |
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1603 failures += 1; |
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|
1604 } |
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|
1605 } |
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|
1606 |
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1607 if (failures > 0 && _verbose) { |
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1608 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1609 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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1610 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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1611 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1612 } |
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|
1613 |
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1614 _failures += failures; |
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|
1615 |
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1616 // We could stop iteration over the heap when we |
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1617 // find the first violating region by returning true. |
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1618 return false; |
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1619 } |
342 | 1620 }; |
1621 | |
4836
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1622 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1623 protected: |
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1624 G1CollectedHeap* _g1h; |
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1625 ConcurrentMark* _cm; |
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1626 BitMap* _actual_region_bm; |
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1627 BitMap* _actual_card_bm; |
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1628 |
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1629 uint _n_workers; |
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|
1630 |
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1631 BitMap* _expected_region_bm; |
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1632 BitMap* _expected_card_bm; |
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|
1633 |
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1634 int _failures; |
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|
1635 bool _verbose; |
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|
1636 |
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|
1637 public: |
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|
1638 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1639 BitMap* region_bm, BitMap* card_bm, |
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1640 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1641 : AbstractGangTask("G1 verify final counting"), |
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1642 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1643 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1644 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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|
1645 _failures(0), _verbose(false), |
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|
1646 _n_workers(0) { |
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|
1647 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1648 |
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1649 // Use the value already set as the number of active threads |
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|
1650 // in the call to run_task(). |
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|
1651 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1652 assert( _g1h->workers()->active_workers() > 0, |
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|
1653 "Should have been previously set"); |
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|
1654 _n_workers = _g1h->workers()->active_workers(); |
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|
1655 } else { |
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|
1656 _n_workers = 1; |
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|
1657 } |
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|
1658 |
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|
1659 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1660 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1661 |
d30fa85f9994
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|
1662 _verbose = _cm->verbose_medium(); |
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|
1663 } |
d30fa85f9994
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diff
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|
1664 |
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diff
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|
1665 void work(uint worker_id) { |
d30fa85f9994
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diff
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|
1666 assert(worker_id < _n_workers, "invariant"); |
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|
1667 |
6812
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diff
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|
1668 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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|
1669 _actual_region_bm, _actual_card_bm, |
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|
1670 _expected_region_bm, |
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diff
changeset
|
1671 _expected_card_bm, |
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diff
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|
1672 _verbose); |
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diff
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|
1673 |
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diff
changeset
|
1674 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1675 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1676 worker_id, |
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diff
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|
1677 _n_workers, |
d30fa85f9994
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diff
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|
1678 HeapRegion::VerifyCountClaimValue); |
d30fa85f9994
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diff
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|
1679 } else { |
d30fa85f9994
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diff
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|
1680 _g1h->heap_region_iterate(&verify_cl); |
d30fa85f9994
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|
1681 } |
d30fa85f9994
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diff
changeset
|
1682 |
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diff
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|
1683 Atomic::add(verify_cl.failures(), &_failures); |
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|
1684 } |
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diff
changeset
|
1685 |
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diff
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|
1686 int failures() const { return _failures; } |
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|
1687 }; |
d30fa85f9994
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|
1688 |
6027
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|
1689 // Closure that finalizes the liveness counting data. |
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|
1690 // Used during the cleanup pause. |
8a2e5a6a19a4
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|
1691 // Sets the bits corresponding to the interval [NTAMS, top] |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1692 // (which contains the implicitly live objects) in the |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1693 // card liveness bitmap. Also sets the bit for each region, |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1694 // containing live data, in the region liveness bitmap. |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1695 |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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diff
changeset
|
1696 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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diff
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|
1697 public: |
6812
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diff
changeset
|
1698 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
4836
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|
1699 BitMap* region_bm, |
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|
1700 BitMap* card_bm) : |
6812
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changeset
|
1701 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1702 |
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changeset
|
1703 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
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|
1704 |
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diff
changeset
|
1705 if (hr->continuesHumongous()) { |
d30fa85f9994
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|
1706 // We will ignore these here and process them when their |
d30fa85f9994
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diff
changeset
|
1707 // associated "starts humongous" region is processed (see |
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1708 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1709 // associated "starts humongous" region to have their bit set to |
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|
1710 // 1 since, due to the region chunking in the parallel region |
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|
1711 // iteration, a "continues humongous" region might be visited |
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|
1712 // before its associated "starts humongous". |
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|
1713 return false; |
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|
1714 } |
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|
1715 |
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|
1716 HeapWord* ntams = hr->next_top_at_mark_start(); |
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|
1717 HeapWord* top = hr->top(); |
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|
1718 |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1719 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1720 |
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|
1721 // Mark the allocated-since-marking portion... |
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|
1722 if (ntams < top) { |
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|
1723 // This definitely means the region has live objects. |
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|
1724 set_bit_for_region(hr); |
6812
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|
1725 |
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|
1726 // Now set the bits in the card bitmap for [ntams, top) |
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|
1727 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1728 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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|
1729 |
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|
1730 // Note: if we're looking at the last region in heap - top |
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1731 // could be actually just beyond the end of the heap; end_idx |
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1732 // will then correspond to a (non-existent) card that is also |
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|
1733 // just beyond the heap. |
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|
1734 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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|
1735 // end of object is not card aligned - increment to cover |
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|
1736 // all the cards spanned by the object |
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|
1737 end_idx += 1; |
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|
1738 } |
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|
1739 |
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|
1740 assert(end_idx <= _card_bm->size(), |
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|
1741 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1742 end_idx, _card_bm->size())); |
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|
1743 assert(start_idx < _card_bm->size(), |
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|
1744 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1745 start_idx, _card_bm->size())); |
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|
1746 |
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|
1747 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
da91efe96a93
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|
1748 } |
4836
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|
1749 |
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|
1750 // Set the bit for the region if it contains live data |
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|
1751 if (hr->next_marked_bytes() > 0) { |
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1752 set_bit_for_region(hr); |
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|
1753 } |
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|
1754 |
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|
1755 return false; |
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|
1756 } |
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|
1757 }; |
342 | 1758 |
1759 class G1ParFinalCountTask: public AbstractGangTask { | |
1760 protected: | |
1761 G1CollectedHeap* _g1h; | |
4836
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|
1762 ConcurrentMark* _cm; |
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|
1763 BitMap* _actual_region_bm; |
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1764 BitMap* _actual_card_bm; |
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1765 |
4728
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|
1766 uint _n_workers; |
4836
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1767 |
342 | 1768 public: |
4836
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1769 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1770 : AbstractGangTask("G1 final counting"), |
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1771 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1772 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1773 _n_workers(0) { |
4095
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|
1774 // Use the value already set as the number of active threads |
6011 | 1775 // in the call to run_task(). |
4095
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1776 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1777 assert( _g1h->workers()->active_workers() > 0, |
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|
1778 "Should have been previously set"); |
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|
1779 _n_workers = _g1h->workers()->active_workers(); |
3776
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1780 } else { |
342 | 1781 _n_workers = 1; |
3776
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|
1782 } |
342 | 1783 } |
1784 | |
4728
441e946dc1af
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|
1785 void work(uint worker_id) { |
4836
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1786 assert(worker_id < _n_workers, "invariant"); |
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|
1787 |
6812
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|
1788 FinalCountDataUpdateClosure final_update_cl(_g1h, |
4836
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1789 _actual_region_bm, |
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|
1790 _actual_card_bm); |
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|
1791 |
1833
8b10f48633dc
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|
1792 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4836
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|
1793 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1794 worker_id, |
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1795 _n_workers, |
355 | 1796 HeapRegion::FinalCountClaimValue); |
342 | 1797 } else { |
4836
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1798 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1799 } |
1800 } | |
1801 }; | |
1802 | |
1803 class G1ParNoteEndTask; | |
1804 | |
1805 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1806 G1CollectedHeap* _g1; | |
1807 int _worker_num; | |
1808 size_t _max_live_bytes; | |
6010
720b6a76dd9d
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1809 uint _regions_claimed; |
342 | 1810 size_t _freed_bytes; |
2173 | 1811 FreeRegionList* _local_cleanup_list; |
4072 | 1812 OldRegionSet* _old_proxy_set; |
2173 | 1813 HumongousRegionSet* _humongous_proxy_set; |
1814 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1815 double _claimed_region_time; |
1816 double _max_region_time; | |
1817 | |
1818 public: | |
1819 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1820 int worker_num, |
1821 FreeRegionList* local_cleanup_list, | |
4072 | 1822 OldRegionSet* old_proxy_set, |
2173 | 1823 HumongousRegionSet* humongous_proxy_set, |
4093
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1824 HRRSCleanupTask* hrrs_cleanup_task) : |
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1825 _g1(g1), _worker_num(worker_num), |
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1826 _max_live_bytes(0), _regions_claimed(0), |
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1827 _freed_bytes(0), |
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|
1828 _claimed_region_time(0.0), _max_region_time(0.0), |
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|
1829 _local_cleanup_list(local_cleanup_list), |
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1830 _old_proxy_set(old_proxy_set), |
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1831 _humongous_proxy_set(humongous_proxy_set), |
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|
1832 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1833 |
342 | 1834 size_t freed_bytes() { return _freed_bytes; } |
1835 | |
4093
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|
1836 bool doHeapRegion(HeapRegion *hr) { |
6254
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1837 if (hr->continuesHumongous()) { |
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1838 return false; |
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|
1839 } |
4093
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|
1840 // We use a claim value of zero here because all regions |
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1841 // were claimed with value 1 in the FinalCount task. |
6254
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1842 _g1->reset_gc_time_stamps(hr); |
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|
1843 double start = os::elapsedTime(); |
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|
1844 _regions_claimed++; |
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|
1845 hr->note_end_of_marking(); |
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|
1846 _max_live_bytes += hr->max_live_bytes(); |
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1847 _g1->free_region_if_empty(hr, |
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1848 &_freed_bytes, |
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|
1849 _local_cleanup_list, |
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|
1850 _old_proxy_set, |
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1851 _humongous_proxy_set, |
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1852 _hrrs_cleanup_task, |
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|
1853 true /* par */); |
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|
1854 double region_time = (os::elapsedTime() - start); |
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1855 _claimed_region_time += region_time; |
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|
1856 if (region_time > _max_region_time) { |
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|
1857 _max_region_time = region_time; |
4093
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|
1858 } |
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|
1859 return false; |
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1860 } |
342 | 1861 |
1862 size_t max_live_bytes() { return _max_live_bytes; } | |
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1863 uint regions_claimed() { return _regions_claimed; } |
342 | 1864 double claimed_region_time_sec() { return _claimed_region_time; } |
1865 double max_region_time_sec() { return _max_region_time; } | |
1866 }; | |
1867 | |
1868 class G1ParNoteEndTask: public AbstractGangTask { | |
1869 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1870 |
342 | 1871 protected: |
1872 G1CollectedHeap* _g1h; | |
1873 size_t _max_live_bytes; | |
1874 size_t _freed_bytes; | |
2152 | 1875 FreeRegionList* _cleanup_list; |
1876 | |
342 | 1877 public: |
1878 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1879 FreeRegionList* cleanup_list) : |
342 | 1880 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1881 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1882 |
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1883 void work(uint worker_id) { |
342 | 1884 double start = os::elapsedTime(); |
2173 | 1885 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1886 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1887 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1888 HRRSCleanupTask hrrs_cleanup_task; | |
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1889 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1890 &old_proxy_set, |
2173 | 1891 &humongous_proxy_set, |
1892 &hrrs_cleanup_task); | |
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1893 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1894 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1895 _g1h->workers()->active_workers(), |
355 | 1896 HeapRegion::NoteEndClaimValue); |
342 | 1897 } else { |
1898 _g1h->heap_region_iterate(&g1_note_end); | |
1899 } | |
1900 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1901 | |
2152 | 1902 // Now update the lists |
1903 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1904 NULL /* free_list */, | |
4072 | 1905 &old_proxy_set, |
2173 | 1906 &humongous_proxy_set, |
2152 | 1907 true /* par */); |
342 | 1908 { |
1909 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1910 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1911 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1912 |
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1913 // If we iterate over the global cleanup list at the end of |
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1914 // cleanup to do this printing we will not guarantee to only |
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1915 // generate output for the newly-reclaimed regions (the list |
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1916 // might not be empty at the beginning of cleanup; we might |
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1917 // still be working on its previous contents). So we do the |
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1918 // printing here, before we append the new regions to the global |
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1919 // cleanup list. |
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1920 |
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1921 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1922 if (hr_printer->is_active()) { |
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1923 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1924 while (iter.more_available()) { |
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1925 HeapRegion* hr = iter.get_next(); |
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1926 hr_printer->cleanup(hr); |
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1927 } |
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1928 } |
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1929 |
2173 | 1930 _cleanup_list->add_as_tail(&local_cleanup_list); |
1931 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1932 | |
1933 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1934 } |
1935 } | |
1936 size_t max_live_bytes() { return _max_live_bytes; } | |
1937 size_t freed_bytes() { return _freed_bytes; } | |
1938 }; | |
1939 | |
1940 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1941 protected: | |
1942 G1RemSet* _g1rs; | |
1943 BitMap* _region_bm; | |
1944 BitMap* _card_bm; | |
1945 public: | |
1946 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1947 BitMap* region_bm, BitMap* card_bm) : | |
1948 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1949 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1950 |
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1951 void work(uint worker_id) { |
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1952 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1953 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1954 HeapRegion::ScrubRemSetClaimValue); |
342 | 1955 } else { |
1956 _g1rs->scrub(_region_bm, _card_bm); | |
1957 } | |
1958 } | |
1959 | |
1960 }; | |
1961 | |
1962 void ConcurrentMark::cleanup() { | |
1963 // world is stopped at this checkpoint | |
1964 assert(SafepointSynchronize::is_at_safepoint(), | |
1965 "world should be stopped"); | |
1966 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1967 | |
1968 // If a full collection has happened, we shouldn't do this. | |
1969 if (has_aborted()) { | |
1970 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1971 return; | |
1972 } | |
1973 | |
4072 | 1974 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1975 g1h->verify_region_sets_optional(); |
1976 | |
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1977 if (VerifyDuringGC) { |
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1978 HandleMark hm; // handle scope |
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1979 Universe::heap()->prepare_for_verify(); |
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1980 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1981 " VerifyDuringGC:(before)"); |
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1982 } |
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1983 |
342 | 1984 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1985 g1p->record_concurrent_mark_cleanup_start(); | |
1986 | |
1987 double start = os::elapsedTime(); | |
1988 | |
2173 | 1989 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1990 | |
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1991 uint n_workers; |
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1992 |
342 | 1993 // Do counting once more with the world stopped for good measure. |
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1994 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1995 |
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1996 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1997 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1998 "sanity check"); |
1999 | |
4711 | 2000 g1h->set_par_threads(); |
2001 n_workers = g1h->n_par_threads(); | |
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2002 assert(g1h->n_par_threads() == n_workers, |
4711 | 2003 "Should not have been reset"); |
342 | 2004 g1h->workers()->run_task(&g1_par_count_task); |
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2005 // Done with the parallel phase so reset to 0. |
342 | 2006 g1h->set_par_threads(0); |
355 | 2007 |
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2008 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2009 "sanity check"); |
342 | 2010 } else { |
4711 | 2011 n_workers = 1; |
342 | 2012 g1_par_count_task.work(0); |
2013 } | |
2014 | |
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2015 if (VerifyDuringGC) { |
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2016 // Verify that the counting data accumulated during marking matches |
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2017 // that calculated by walking the marking bitmap. |
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2018 |
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2019 // Bitmaps to hold expected values |
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2020 BitMap expected_region_bm(_region_bm.size(), false); |
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2021 BitMap expected_card_bm(_card_bm.size(), false); |
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2022 |
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2023 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2024 &_region_bm, |
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2025 &_card_bm, |
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2026 &expected_region_bm, |
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2027 &expected_card_bm); |
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2028 |
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2029 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2030 g1h->set_par_threads((int)n_workers); |
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2031 g1h->workers()->run_task(&g1_par_verify_task); |
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2032 // Done with the parallel phase so reset to 0. |
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2033 g1h->set_par_threads(0); |
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2034 |
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2035 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2036 "sanity check"); |
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2037 } else { |
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2038 g1_par_verify_task.work(0); |
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2039 } |
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2040 |
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2041 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2042 } |
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2043 |
342 | 2044 size_t start_used_bytes = g1h->used(); |
2045 g1h->set_marking_complete(); | |
2046 | |
2047 double count_end = os::elapsedTime(); | |
2048 double this_final_counting_time = (count_end - start); | |
2049 _total_counting_time += this_final_counting_time; | |
2050 | |
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2051 if (G1PrintRegionLivenessInfo) { |
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2052 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2053 _g1h->heap_region_iterate(&cl); |
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2054 } |
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2055 |
342 | 2056 // Install newly created mark bitMap as "prev". |
2057 swapMarkBitMaps(); | |
2058 | |
2059 g1h->reset_gc_time_stamp(); | |
2060 | |
2061 // Note end of marking in all heap regions. | |
2152 | 2062 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2063 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2064 g1h->set_par_threads((int)n_workers); |
342 | 2065 g1h->workers()->run_task(&g1_par_note_end_task); |
2066 g1h->set_par_threads(0); | |
355 | 2067 |
2068 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2069 "sanity check"); | |
342 | 2070 } else { |
2071 g1_par_note_end_task.work(0); | |
2072 } | |
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2073 g1h->check_gc_time_stamps(); |
2152 | 2074 |
2075 if (!cleanup_list_is_empty()) { | |
2076 // The cleanup list is not empty, so we'll have to process it | |
2077 // concurrently. Notify anyone else that might be wanting free | |
2078 // regions that there will be more free regions coming soon. | |
2079 g1h->set_free_regions_coming(); | |
2080 } | |
342 | 2081 |
2082 // call below, since it affects the metric by which we sort the heap | |
2083 // regions. | |
2084 if (G1ScrubRemSets) { | |
2085 double rs_scrub_start = os::elapsedTime(); | |
2086 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2087 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2088 g1h->set_par_threads((int)n_workers); |
342 | 2089 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2090 g1h->set_par_threads(0); | |
355 | 2091 |
2092 assert(g1h->check_heap_region_claim_values( | |
2093 HeapRegion::ScrubRemSetClaimValue), | |
2094 "sanity check"); | |
342 | 2095 } else { |
2096 g1_par_scrub_rs_task.work(0); | |
2097 } | |
2098 | |
2099 double rs_scrub_end = os::elapsedTime(); | |
2100 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2101 _total_rs_scrub_time += this_rs_scrub_time; | |
2102 } | |
2103 | |
2104 // this will also free any regions totally full of garbage objects, | |
2105 // and sort the regions. | |
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2106 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2107 |
2108 // Statistics. | |
2109 double end = os::elapsedTime(); | |
2110 _cleanup_times.add((end - start) * 1000.0); | |
2111 | |
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2112 if (G1Log::fine()) { |
342 | 2113 g1h->print_size_transition(gclog_or_tty, |
2114 start_used_bytes, | |
2115 g1h->used(), | |
2116 g1h->capacity()); | |
2117 } | |
2118 | |
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2119 // Clean up will have freed any regions completely full of garbage. |
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2120 // Update the soft reference policy with the new heap occupancy. |
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2121 Universe::update_heap_info_at_gc(); |
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2122 |
342 | 2123 // We need to make this be a "collection" so any collection pause that |
2124 // races with it goes around and waits for completeCleanup to finish. | |
2125 g1h->increment_total_collections(); | |
2126 | |
4830
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2127 // We reclaimed old regions so we should calculate the sizes to make |
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2128 // sure we update the old gen/space data. |
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2129 g1h->g1mm()->update_sizes(); |
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2130 |
751 | 2131 if (VerifyDuringGC) { |
845
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2132 HandleMark hm; // handle scope |
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2133 Universe::heap()->prepare_for_verify(); |
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2134 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2135 " VerifyDuringGC:(after)"); |
342 | 2136 } |
2152 | 2137 |
2138 g1h->verify_region_sets_optional(); | |
10405 | 2139 g1h->trace_heap_after_concurrent_cycle(); |
342 | 2140 } |
2141 | |
2142 void ConcurrentMark::completeCleanup() { | |
2143 if (has_aborted()) return; | |
2144 | |
2152 | 2145 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2146 | |
2147 _cleanup_list.verify_optional(); | |
2361 | 2148 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2149 |
2150 if (G1ConcRegionFreeingVerbose) { | |
2151 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2152 "cleanup list has %u entries", |
2152 | 2153 _cleanup_list.length()); |
2154 } | |
2155 | |
2156 // Noone else should be accessing the _cleanup_list at this point, | |
2157 // so it's not necessary to take any locks | |
2158 while (!_cleanup_list.is_empty()) { | |
2159 HeapRegion* hr = _cleanup_list.remove_head(); | |
2160 assert(hr != NULL, "the list was not empty"); | |
3317
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2161 hr->par_clear(); |
2361 | 2162 tmp_free_list.add_as_tail(hr); |
2152 | 2163 |
2164 // Instead of adding one region at a time to the secondary_free_list, | |
2165 // we accumulate them in the local list and move them a few at a | |
2166 // time. This also cuts down on the number of notify_all() calls | |
2167 // we do during this process. We'll also append the local list when | |
2168 // _cleanup_list is empty (which means we just removed the last | |
2169 // region from the _cleanup_list). | |
2361 | 2170 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2171 _cleanup_list.is_empty()) { |
2172 if (G1ConcRegionFreeingVerbose) { | |
2173 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2174 "appending %u entries to the secondary_free_list, " |
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2175 "cleanup list still has %u entries", |
2361 | 2176 tmp_free_list.length(), |
2152 | 2177 _cleanup_list.length()); |
342 | 2178 } |
2152 | 2179 |
2180 { | |
2181 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2182 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2183 SecondaryFreeList_lock->notify_all(); |
2184 } | |
2185 | |
2186 if (G1StressConcRegionFreeing) { | |
2187 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2188 os::sleep(Thread::current(), (jlong) 1, false); | |
2189 } | |
2190 } | |
342 | 2191 } |
2192 } | |
2361 | 2193 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2194 } |
2195 | |
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2196 // Supporting Object and Oop closures for reference discovery |
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|
2197 // and processing in during marking |
2174
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|
2198 |
2037
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|
2199 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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|
2200 HeapWord* addr = (HeapWord*)obj; |
b03260081e9b
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|
2201 return addr != NULL && |
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diff
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|
2202 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
b03260081e9b
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|
2203 } |
342 | 2204 |
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|
2205 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
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|
2206 // Uses the CMTask associated with a worker thread (for serial reference |
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|
2207 // processing the CMTask for worker 0 is used) to preserve (mark) and |
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|
2208 // trace referent objects. |
f90b9bceb8e5
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|
2209 // |
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|
2210 // Using the CMTask and embedded local queues avoids having the worker |
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|
2211 // threads operating on the global mark stack. This reduces the risk |
f90b9bceb8e5
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|
2212 // of overflowing the stack - which we would rather avoid at this late |
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|
2213 // state. Also using the tasks' local queues removes the potential |
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|
2214 // of the workers interfering with each other that could occur if |
f90b9bceb8e5
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|
2215 // operating on the global stack. |
f90b9bceb8e5
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|
2216 |
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|
2217 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
8787
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|
2218 ConcurrentMark* _cm; |
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|
2219 CMTask* _task; |
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|
2220 int _ref_counter_limit; |
fa08949fe0cb
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|
2221 int _ref_counter; |
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|
2222 bool _is_serial; |
2174
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|
2223 public: |
8787
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|
2224 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
2225 _cm(cm), _task(task), _is_serial(is_serial), |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
2226 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
234761c55641
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2152
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|
2227 assert(_ref_counter_limit > 0, "sanity"); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
2228 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
2229 _ref_counter = _ref_counter_limit; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2230 } |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2231 |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2232 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2233 virtual void do_oop( oop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2234 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2235 template <class T> void do_oop_work(T* p) { |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
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|
2236 if (!_cm->has_overflown()) { |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2237 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
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|
2238 if (_cm->verbose_high()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
2239 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2240 "*"PTR_FORMAT" = "PTR_FORMAT, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
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|
2241 _task->worker_id(), p, (void*) obj); |
3776
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|
2242 } |
2174
234761c55641
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2152
diff
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|
2243 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2244 _task->deal_with_reference(obj); |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2245 _ref_counter--; |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2246 |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2247 if (_ref_counter == 0) { |
8014
f90b9bceb8e5
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|
2248 // We have dealt with _ref_counter_limit references, pushing them |
f90b9bceb8e5
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|
2249 // and objects reachable from them on to the local stack (and |
f90b9bceb8e5
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|
2250 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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8008
diff
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|
2251 // process these entries. |
f90b9bceb8e5
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diff
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|
2252 // |
f90b9bceb8e5
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|
2253 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
f90b9bceb8e5
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|
2254 // there's nothing more to do (i.e. we're done with the entries that |
f90b9bceb8e5
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|
2255 // were pushed as a result of the CMTask::deal_with_reference() calls |
f90b9bceb8e5
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|
2256 // above) or we overflow. |
f90b9bceb8e5
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|
2257 // |
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|
2258 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
f90b9bceb8e5
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|
2259 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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|
2260 // the beginning of CMTask::do_marking_step() for those conditions - |
f90b9bceb8e5
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|
2261 // one of which is reaching the specified time target.) It is only |
f90b9bceb8e5
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|
2262 // when CMTask::do_marking_step() returns without setting the |
f90b9bceb8e5
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|
2263 // has_aborted() flag that the marking step has completed. |
2174
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|
2264 do { |
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|
2265 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
234761c55641
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|
2266 _task->do_marking_step(mark_step_duration_ms, |
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|
2267 false /* do_termination */, |
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|
2268 _is_serial); |
2174
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|
2269 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2270 _ref_counter = _ref_counter_limit; |
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|
2271 } |
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|
2272 } else { |
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|
2273 if (_cm->verbose_high()) { |
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|
2274 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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|
2275 } |
2174
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|
2276 } |
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|
2277 } |
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|
2278 }; |
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|
2279 |
8014
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|
2280 // 'Drain' oop closure used by both serial and parallel reference processing. |
f90b9bceb8e5
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|
2281 // Uses the CMTask associated with a given worker thread (for serial |
f90b9bceb8e5
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|
2282 // reference processing the CMtask for worker 0 is used). Calls the |
f90b9bceb8e5
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|
2283 // do_marking_step routine, with an unbelievably large timeout value, |
f90b9bceb8e5
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|
2284 // to drain the marking data structures of the remaining entries |
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2285 // added by the 'keep alive' oop closure above. |
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2286 |
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2287 class G1CMDrainMarkingStackClosure: public VoidClosure { |
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2288 ConcurrentMark* _cm; |
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2289 CMTask* _task; |
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2290 bool _is_serial; |
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2291 public: |
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2292 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2293 _cm(cm), _task(task), _is_serial(is_serial) { |
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2294 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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2295 } |
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2296 |
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2297 void do_void() { |
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2298 do { |
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2299 if (_cm->verbose_high()) { |
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2300 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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2301 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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2302 } |
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2303 |
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2304 // We call CMTask::do_marking_step() to completely drain the local |
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2305 // and global marking stacks of entries pushed by the 'keep alive' |
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2306 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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2307 // |
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2308 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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2309 // if there's nothing more to do (i.e. we'completely drained the |
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2310 // entries that were pushed as a a result of applying the 'keep alive' |
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2311 // closure to the entries on the discovered ref lists) or we overflow |
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2312 // the global marking stack. |
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2313 // |
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2314 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2315 // flag while there may still be some work to do. (See the comment at |
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2316 // the beginning of CMTask::do_marking_step() for those conditions - |
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2317 // one of which is reaching the specified time target.) It is only |
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2318 // when CMTask::do_marking_step() returns without setting the |
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2319 // has_aborted() flag that the marking step has completed. |
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2320 |
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2321 _task->do_marking_step(1000000000.0 /* something very large */, |
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2322 true /* do_termination */, |
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2323 _is_serial); |
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2324 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2325 } |
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2326 }; |
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2327 |
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2328 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2329 // reference processing at the end of G1 concurrent marking |
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2330 |
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2331 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2332 private: |
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2333 G1CollectedHeap* _g1h; |
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2334 ConcurrentMark* _cm; |
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2335 WorkGang* _workers; |
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|
2336 int _active_workers; |
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|
2337 |
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|
2338 public: |
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2339 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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2340 ConcurrentMark* cm, |
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2341 WorkGang* workers, |
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2342 int n_workers) : |
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2343 _g1h(g1h), _cm(cm), |
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2344 _workers(workers), _active_workers(n_workers) { } |
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2345 |
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|
2346 // Executes the given task using concurrent marking worker threads. |
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|
2347 virtual void execute(ProcessTask& task); |
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|
2348 virtual void execute(EnqueueTask& task); |
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2349 }; |
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|
2350 |
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2351 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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2352 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2353 ProcessTask& _proc_task; |
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|
2354 G1CollectedHeap* _g1h; |
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|
2355 ConcurrentMark* _cm; |
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|
2356 |
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|
2357 public: |
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|
2358 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
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2359 G1CollectedHeap* g1h, |
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2360 ConcurrentMark* cm) : |
2174
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|
2361 AbstractGangTask("Process reference objects in parallel"), |
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2362 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
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2363 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
2364 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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2365 } |
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|
2366 |
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2367 virtual void work(uint worker_id) { |
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2368 CMTask* task = _cm->task(worker_id); |
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2369 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2370 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
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2371 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
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2372 |
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2373 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2374 } |
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|
2375 }; |
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|
2376 |
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2377 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2378 assert(_workers != NULL, "Need parallel worker threads."); |
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2379 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2380 |
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2381 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
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2382 |
8788
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2383 // We need to reset the concurrency level before each |
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2384 // proxy task execution, so that the termination protocol |
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2385 // and overflow handling in CMTask::do_marking_step() knows |
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2386 // how many workers to wait for. |
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2387 _cm->set_concurrency(_active_workers); |
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2388 _g1h->set_par_threads(_active_workers); |
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2389 _workers->run_task(&proc_task_proxy); |
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2390 _g1h->set_par_threads(0); |
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2391 } |
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2392 |
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2393 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
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2394 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2395 EnqueueTask& _enq_task; |
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|
2396 |
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2397 public: |
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2398 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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2399 AbstractGangTask("Enqueue reference objects in parallel"), |
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2400 _enq_task(enq_task) { } |
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2401 |
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2402 virtual void work(uint worker_id) { |
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2403 _enq_task.work(worker_id); |
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2404 } |
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2405 }; |
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2406 |
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2407 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2408 assert(_workers != NULL, "Need parallel worker threads."); |
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2409 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2410 |
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2411 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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2412 |
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|
2413 // Not strictly necessary but... |
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|
2414 // |
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|
2415 // We need to reset the concurrency level before each |
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2416 // proxy task execution, so that the termination protocol |
e864cc14ca75
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2417 // and overflow handling in CMTask::do_marking_step() knows |
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2418 // how many workers to wait for. |
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|
2419 _cm->set_concurrency(_active_workers); |
2174
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2420 _g1h->set_par_threads(_active_workers); |
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|
2421 _workers->run_task(&enq_task_proxy); |
234761c55641
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|
2422 _g1h->set_par_threads(0); |
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|
2423 } |
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|
2424 |
342 | 2425 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
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2426 if (has_overflown()) { |
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2427 // Skip processing the discovered references if we have |
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|
2428 // overflown the global marking stack. Reference objects |
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2429 // only get discovered once so it is OK to not |
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|
2430 // de-populate the discovered reference lists. We could have, |
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2431 // but the only benefit would be that, when marking restarts, |
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|
2432 // less reference objects are discovered. |
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|
2433 return; |
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|
2434 } |
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|
2435 |
342 | 2436 ResourceMark rm; |
2437 HandleMark hm; | |
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|
2438 |
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|
2439 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2440 |
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|
2441 // Is alive closure. |
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|
2442 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2443 |
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|
2444 // Inner scope to exclude the cleaning of the string and symbol |
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|
2445 // tables from the displayed time. |
1847b501ae74
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|
2446 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
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|
2447 if (G1Log::finer()) { |
3975
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|
2448 gclog_or_tty->put(' '); |
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|
2449 } |
10405 | 2450 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm()); |
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|
2451 |
3979
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|
2452 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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|
2453 |
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|
2454 // See the comment in G1CollectedHeap::ref_processing_init() |
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|
2455 // about how reference processing currently works in G1. |
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|
2456 |
8014
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|
2457 // Set the soft reference policy |
3975
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|
2458 rp->setup_policy(clear_all_soft_refs); |
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|
2459 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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|
2460 |
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|
2461 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
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|
2462 // in serial reference processing. Note these closures are also |
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|
2463 // used for serially processing (by the the current thread) the |
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diff
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|
2464 // JNI references during parallel reference processing. |
fa08949fe0cb
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diff
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|
2465 // |
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|
2466 // These closures do not need to synchronize with the worker |
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diff
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|
2467 // threads involved in parallel reference processing as these |
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|
2468 // instances are executed serially by the current thread (e.g. |
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|
2469 // reference processing is not multi-threaded and is thus |
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diff
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|
2470 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
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diff
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|
2471 // |
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|
2472 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
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diff
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|
2473 // their own instances of these closures, which do their own |
fa08949fe0cb
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diff
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|
2474 // synchronization among themselves. |
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|
2475 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
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|
2476 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
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|
2477 |
fa08949fe0cb
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|
2478 // We need at least one active thread. If reference processing |
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|
2479 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
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|
2480 // otherwise we use the work gang from the G1CollectedHeap and |
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diff
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|
2481 // we utilize all the worker threads we can. |
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|
2482 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
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|
2483 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
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diff
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|
2484 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
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|
2485 |
8787
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|
2486 // Parallel processing task executor. |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2487 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2488 g1h->workers(), active_workers); |
8787
fa08949fe0cb
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|
2489 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
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|
2490 |
8788
e864cc14ca75
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|
2491 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
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|
2492 // executing the remark task. |
e864cc14ca75
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|
2493 set_concurrency(active_workers); |
e864cc14ca75
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|
2494 |
8014
f90b9bceb8e5
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diff
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|
2495 // Set the degree of MT processing here. If the discovery was done MT, |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2496 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2497 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2498 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2499 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2500 |
f90b9bceb8e5
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diff
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|
2501 // Process the weak references. |
10405 | 2502 const ReferenceProcessorStats& stats = |
2503 rp->process_discovered_references(&g1_is_alive, | |
2504 &g1_keep_alive, | |
2505 &g1_drain_mark_stack, | |
2506 executor, | |
2507 g1h->gc_timer_cm()); | |
2508 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); | |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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|
2509 |
f90b9bceb8e5
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|
2510 // The do_oop work routines of the keep_alive and drain_marking_stack |
f90b9bceb8e5
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diff
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|
2511 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
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diff
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|
2512 // global marking stack. |
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|
2513 |
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|
2514 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
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diff
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|
2515 "mark stack should be empty (unless it overflowed)"); |
8787
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|
2516 |
3975
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|
2517 if (_markStack.overflow()) { |
8014
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8008
diff
changeset
|
2518 // This should have been done already when we tried to push an |
3975
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diff
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|
2519 // entry on to the global mark stack. But let's do it again. |
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|
2520 set_has_overflown(); |
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|
2521 } |
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|
2522 |
8014
f90b9bceb8e5
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|
2523 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
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|
2524 |
f90b9bceb8e5
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|
2525 rp->enqueue_discovered_references(executor); |
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|
2526 |
1847b501ae74
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|
2527 rp->verify_no_references_recorded(); |
3979
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|
2528 assert(!rp->discovery_enabled(), "Post condition"); |
2174
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|
2529 } |
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|
2530 |
17635
cb7ec2423207
8027454: Do not traverse string table during G1 remark when treating them as strong roots during initial mark
tschatzl
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17634
diff
changeset
|
2531 g1h->unlink_string_and_symbol_table(&g1_is_alive, |
cb7ec2423207
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tschatzl
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|
2532 /* process_strings */ false, // currently strings are always roots |
cb7ec2423207
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17634
diff
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|
2533 /* process_symbols */ true); |
342 | 2534 } |
2535 | |
2536 void ConcurrentMark::swapMarkBitMaps() { | |
2537 CMBitMapRO* temp = _prevMarkBitMap; | |
2538 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2539 _nextMarkBitMap = (CMBitMap*) temp; | |
2540 } | |
2541 | |
2542 class CMRemarkTask: public AbstractGangTask { | |
2543 private: | |
8787
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|
2544 ConcurrentMark* _cm; |
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|
2545 bool _is_serial; |
342 | 2546 public: |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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4711
diff
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|
2547 void work(uint worker_id) { |
342 | 2548 // Since all available tasks are actually started, we should |
2549 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
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diff
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|
2550 if (worker_id < _cm->active_tasks()) { |
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diff
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|
2551 CMTask* task = _cm->task(worker_id); |
342 | 2552 task->record_start_time(); |
2553 do { | |
2174
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|
2554 task->do_marking_step(1000000000.0 /* something very large */, |
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|
2555 true /* do_termination */, |
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|
2556 _is_serial); |
342 | 2557 } while (task->has_aborted() && !_cm->has_overflown()); |
2558 // If we overflow, then we do not want to restart. We instead | |
2559 // want to abort remark and do concurrent marking again. | |
2560 task->record_end_time(); | |
2561 } | |
2562 } | |
2563 | |
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2564 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
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2565 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2566 _cm->terminator()->reset_for_reuse(active_workers); |
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2567 } |
342 | 2568 }; |
2569 | |
2570 void ConcurrentMark::checkpointRootsFinalWork() { | |
2571 ResourceMark rm; | |
2572 HandleMark hm; | |
2573 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2574 | |
2575 g1h->ensure_parsability(false); | |
2576 | |
1833
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2577 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2578 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2579 // this is remark, so we'll use up all active threads |
4728
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2580 uint active_workers = g1h->workers()->active_workers(); |
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2581 if (active_workers == 0) { |
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2582 assert(active_workers > 0, "Should have been set earlier"); |
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2583 active_workers = (uint) ParallelGCThreads; |
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2584 g1h->workers()->set_active_workers(active_workers); |
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2585 } |
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2586 set_concurrency_and_phase(active_workers, false /* concurrent */); |
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|
2587 // Leave _parallel_marking_threads at it's |
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|
2588 // value originally calculated in the ConcurrentMark |
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|
2589 // constructor and pass values of the active workers |
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|
2590 // through the gang in the task. |
342 | 2591 |
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|
2592 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
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2593 // We will start all available threads, even if we decide that the |
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|
2594 // active_workers will be fewer. The extra ones will just bail out |
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|
2595 // immediately. |
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|
2596 g1h->set_par_threads(active_workers); |
342 | 2597 g1h->workers()->run_task(&remarkTask); |
2598 g1h->set_par_threads(0); | |
2599 } else { | |
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|
2600 G1CollectedHeap::StrongRootsScope srs(g1h); |
4728
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|
2601 uint active_workers = 1; |
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|
2602 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2603 |
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|
2604 // Note - if there's no work gang then the VMThread will be |
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|
2605 // the thread to execute the remark - serially. We have |
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|
2606 // to pass true for the is_serial parameter so that |
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|
2607 // CMTask::do_marking_step() doesn't enter the sync |
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|
2608 // barriers in the event of an overflow. Doing so will |
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|
2609 // cause an assert that the current thread is not a |
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|
2610 // concurrent GC thread. |
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|
2611 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2612 remarkTask.work(0); |
2613 } | |
1023
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1022
diff
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|
2614 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
8789
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
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|
2615 guarantee(has_overflown() || |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
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|
2616 satb_mq_set.completed_buffers_num() == 0, |
1179172e9ec9
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|
2617 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
1179172e9ec9
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|
2618 BOOL_TO_STR(has_overflown()), |
1179172e9ec9
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|
2619 satb_mq_set.completed_buffers_num())); |
342 | 2620 |
2621 print_stats(); | |
2622 } | |
2623 | |
1044 | 2624 #ifndef PRODUCT |
2625 | |
1388 | 2626 class PrintReachableOopClosure: public OopClosure { |
342 | 2627 private: |
2628 G1CollectedHeap* _g1h; | |
2629 outputStream* _out; | |
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7004681: G1: Extend marking verification to Full GCs
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|
2630 VerifyOption _vo; |
1388 | 2631 bool _all; |
342 | 2632 |
2633 public: | |
3772
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|
2634 PrintReachableOopClosure(outputStream* out, |
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7004681: G1: Extend marking verification to Full GCs
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|
2635 VerifyOption vo, |
1388 | 2636 bool all) : |
1044 | 2637 _g1h(G1CollectedHeap::heap()), |
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|
2638 _out(out), _vo(vo), _all(all) { } |
342 | 2639 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2640 void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
2641 void do_oop( oop* p) { do_oop_work(p); } |
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|
2642 |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2643 template <class T> void do_oop_work(T* p) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2644 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2645 const char* str = NULL; |
2646 const char* str2 = ""; | |
2647 | |
1388 | 2648 if (obj == NULL) { |
2649 str = ""; | |
2650 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2651 str = " O"; | |
2652 } else { | |
342 | 2653 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
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diff
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|
2654 guarantee(hr != NULL, "invariant"); |
6254
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|
2655 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2656 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2657 |
2658 if (over_tams) { | |
1388 | 2659 str = " >"; |
2660 if (marked) { | |
342 | 2661 str2 = " AND MARKED"; |
1044 | 2662 } |
1388 | 2663 } else if (marked) { |
2664 str = " M"; | |
1044 | 2665 } else { |
1388 | 2666 str = " NOT"; |
1044 | 2667 } |
342 | 2668 } |
2669 | |
1388 | 2670 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2671 p, (void*) obj, str, str2); |
2672 } | |
2673 }; | |
2674 | |
1388 | 2675 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2676 private: |
3772
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7004681: G1: Extend marking verification to Full GCs
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3771
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changeset
|
2677 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
2678 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2679 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
2680 bool _all; |
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7004681: G1: Extend marking verification to Full GCs
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|
2681 HeapRegion* _hr; |
342 | 2682 |
2683 public: | |
3772
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7004681: G1: Extend marking verification to Full GCs
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changeset
|
2684 PrintReachableObjectClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2685 VerifyOption vo, |
1388 | 2686 bool all, |
2687 HeapRegion* hr) : | |
3772
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7004681: G1: Extend marking verification to Full GCs
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|
2688 _g1h(G1CollectedHeap::heap()), |
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7004681: G1: Extend marking verification to Full GCs
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|
2689 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2690 |
2691 void do_object(oop o) { | |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2692 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2693 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2694 bool print_it = _all || over_tams || marked; |
2695 | |
2696 if (print_it) { | |
2697 _out->print_cr(" "PTR_FORMAT"%s", | |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
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12229
diff
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|
2698 (void *)o, (over_tams) ? " >" : (marked) ? " M" : ""); |
3772
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|
2699 PrintReachableOopClosure oopCl(_out, _vo, _all); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2700 o->oop_iterate_no_header(&oopCl); |
1388 | 2701 } |
342 | 2702 } |
2703 }; | |
2704 | |
1388 | 2705 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2706 private: |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2707 G1CollectedHeap* _g1h; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2708 outputStream* _out; |
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|
2709 VerifyOption _vo; |
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|
2710 bool _all; |
342 | 2711 |
2712 public: | |
2713 bool doHeapRegion(HeapRegion* hr) { | |
2714 HeapWord* b = hr->bottom(); | |
2715 HeapWord* e = hr->end(); | |
2716 HeapWord* t = hr->top(); | |
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|
2717 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2718 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2719 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2720 _out->cr(); |
2721 | |
2722 HeapWord* from = b; | |
2723 HeapWord* to = t; | |
2724 | |
2725 if (to > from) { | |
2726 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2727 _out->cr(); | |
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|
2728 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2729 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2730 _out->cr(); | |
2731 } | |
342 | 2732 |
2733 return false; | |
2734 } | |
2735 | |
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|
2736 PrintReachableRegionClosure(outputStream* out, |
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|
2737 VerifyOption vo, |
1388 | 2738 bool all) : |
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|
2739 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2740 }; |
2741 | |
1388 | 2742 void ConcurrentMark::print_reachable(const char* str, |
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|
2743 VerifyOption vo, |
1388 | 2744 bool all) { |
2745 gclog_or_tty->cr(); | |
2746 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2747 |
2748 if (G1PrintReachableBaseFile == NULL) { | |
2749 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2750 return; | |
2751 } | |
2752 | |
2753 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2754 (JVM_MAXPATHLEN - 1)) { | |
2755 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2756 return; | |
2757 } | |
2758 | |
2759 char file_name[JVM_MAXPATHLEN]; | |
2760 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2761 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2762 | |
2763 fileStream fout(file_name); | |
2764 if (!fout.is_open()) { | |
2765 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2766 return; | |
2767 } | |
2768 | |
2769 outputStream* out = &fout; | |
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|
2770 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2771 out->cr(); |
2772 | |
1388 | 2773 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2774 out->cr(); |
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|
2775 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2776 _g1h->heap_region_iterate(&rcl); |
1044 | 2777 out->cr(); |
2778 | |
2779 gclog_or_tty->print_cr(" done"); | |
1388 | 2780 gclog_or_tty->flush(); |
342 | 2781 } |
2782 | |
1044 | 2783 #endif // PRODUCT |
2784 | |
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|
2785 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2786 // Note we are overriding the read-only view of the prev map here, via |
2787 // the cast. | |
2788 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
4787
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|
2789 } |
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|
2790 |
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|
2791 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2792 _nextMarkBitMap->clearRange(mr); |
2793 } | |
2794 | |
4787
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|
2795 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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diff
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|
2796 clearRangePrevBitmap(mr); |
2ace1c4ee8da
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diff
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|
2797 clearRangeNextBitmap(mr); |
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|
2798 } |
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|
2799 |
342 | 2800 HeapRegion* |
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2801 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2802 // "checkpoint" the finger |
2803 HeapWord* finger = _finger; | |
2804 | |
2805 // _heap_end will not change underneath our feet; it only changes at | |
2806 // yield points. | |
2807 while (finger < _heap_end) { | |
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2808 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2809 |
3771 | 2810 // Note on how this code handles humongous regions. In the |
2811 // normal case the finger will reach the start of a "starts | |
2812 // humongous" (SH) region. Its end will either be the end of the | |
2813 // last "continues humongous" (CH) region in the sequence, or the | |
2814 // standard end of the SH region (if the SH is the only region in | |
2815 // the sequence). That way claim_region() will skip over the CH | |
2816 // regions. However, there is a subtle race between a CM thread | |
2817 // executing this method and a mutator thread doing a humongous | |
2818 // object allocation. The two are not mutually exclusive as the CM | |
2819 // thread does not need to hold the Heap_lock when it gets | |
2820 // here. So there is a chance that claim_region() will come across | |
2821 // a free region that's in the progress of becoming a SH or a CH | |
2822 // region. In the former case, it will either | |
2823 // a) Miss the update to the region's end, in which case it will | |
2824 // visit every subsequent CH region, will find their bitmaps | |
2825 // empty, and do nothing, or | |
2826 // b) Will observe the update of the region's end (in which case | |
2827 // it will skip the subsequent CH regions). | |
2828 // If it comes across a region that suddenly becomes CH, the | |
2829 // scenario will be similar to b). So, the race between | |
2830 // claim_region() and a humongous object allocation might force us | |
2831 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2832 // iterations) but it should not introduce and correctness issues. | |
2833 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2834 HeapWord* bottom = curr_region->bottom(); |
2835 HeapWord* end = curr_region->end(); | |
2836 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2837 | |
3771 | 2838 if (verbose_low()) { |
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2839 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2840 "["PTR_FORMAT", "PTR_FORMAT"), " |
2841 "limit = "PTR_FORMAT, | |
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2842 worker_id, curr_region, bottom, end, limit); |
3771 | 2843 } |
2844 | |
2845 // Is the gap between reading the finger and doing the CAS too long? | |
2846 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2847 if (res == finger) { |
2848 // we succeeded | |
2849 | |
2850 // notice that _finger == end cannot be guaranteed here since, | |
2851 // someone else might have moved the finger even further | |
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2852 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2853 |
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2854 if (verbose_low()) { |
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2855 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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2856 PTR_FORMAT, worker_id, curr_region); |
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2857 } |
342 | 2858 |
2859 if (limit > bottom) { | |
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2860 if (verbose_low()) { |
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2861 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2862 "returning it ", worker_id, curr_region); |
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2863 } |
342 | 2864 return curr_region; |
2865 } else { | |
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2866 assert(limit == bottom, |
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2867 "the region limit should be at bottom"); |
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2868 if (verbose_low()) { |
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2869 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2870 "returning NULL", worker_id, curr_region); |
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2871 } |
342 | 2872 // we return NULL and the caller should try calling |
2873 // claim_region() again. | |
2874 return NULL; | |
2875 } | |
2876 } else { | |
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2877 assert(_finger > finger, "the finger should have moved forward"); |
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2878 if (verbose_low()) { |
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2879 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 2880 "global finger = "PTR_FORMAT", " |
2881 "our finger = "PTR_FORMAT, | |
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2882 worker_id, _finger, finger); |
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2883 } |
342 | 2884 |
2885 // read it again | |
2886 finger = _finger; | |
2887 } | |
2888 } | |
2889 | |
2890 return NULL; | |
2891 } | |
2892 | |
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2893 #ifndef PRODUCT |
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2894 enum VerifyNoCSetOopsPhase { |
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2895 VerifyNoCSetOopsStack, |
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2896 VerifyNoCSetOopsQueues, |
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2897 VerifyNoCSetOopsSATBCompleted, |
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2898 VerifyNoCSetOopsSATBThread |
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2899 }; |
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2900 |
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2901 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2902 private: |
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2903 G1CollectedHeap* _g1h; |
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2904 VerifyNoCSetOopsPhase _phase; |
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2905 int _info; |
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2906 |
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2907 const char* phase_str() { |
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2908 switch (_phase) { |
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2909 case VerifyNoCSetOopsStack: return "Stack"; |
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2910 case VerifyNoCSetOopsQueues: return "Queue"; |
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2911 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2912 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2913 default: ShouldNotReachHere(); |
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2914 } |
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2915 return NULL; |
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2916 } |
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2917 |
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2918 void do_object_work(oop obj) { |
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2919 guarantee(!_g1h->obj_in_cs(obj), |
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2920 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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2921 (void*) obj, phase_str(), _info)); |
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2922 } |
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2923 |
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2924 public: |
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2925 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2926 |
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2927 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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2928 _phase = phase; |
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2929 _info = info; |
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|
2930 } |
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2931 |
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2932 virtual void do_oop(oop* p) { |
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2933 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2934 do_object_work(obj); |
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2935 } |
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2936 |
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2937 virtual void do_oop(narrowOop* p) { |
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2938 // We should not come across narrow oops while scanning marking |
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2939 // stacks and SATB buffers. |
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|
2940 ShouldNotReachHere(); |
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|
2941 } |
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2942 |
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2943 virtual void do_object(oop obj) { |
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2944 do_object_work(obj); |
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|
2945 } |
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2946 }; |
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2947 |
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2948 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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2949 bool verify_enqueued_buffers, |
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|
2950 bool verify_thread_buffers, |
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|
2951 bool verify_fingers) { |
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|
2952 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2953 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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2954 return; |
342 | 2955 } |
1835
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|
2956 |
4787
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2957 VerifyNoCSetOopsClosure cl; |
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2958 |
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|
2959 if (verify_stacks) { |
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|
2960 // Verify entries on the global mark stack |
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|
2961 cl.set_phase(VerifyNoCSetOopsStack); |
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2962 _markStack.oops_do(&cl); |
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2963 |
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|
2964 // Verify entries on the task queues |
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2965 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
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|
2966 cl.set_phase(VerifyNoCSetOopsQueues, i); |
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|
2967 CMTaskQueue* queue = _task_queues->queue(i); |
4787
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|
2968 queue->oops_do(&cl); |
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|
2969 } |
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|
2970 } |
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|
2971 |
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|
2972 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
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2973 |
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|
2974 // Verify entries on the enqueued SATB buffers |
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|
2975 if (verify_enqueued_buffers) { |
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|
2976 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
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|
2977 satb_qs.iterate_completed_buffers_read_only(&cl); |
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diff
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|
2978 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2979 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2980 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2981 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2982 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2983 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2984 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2985 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2986 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2987 // Verify the global finger |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2988 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2989 if (global_finger != NULL && global_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2990 // The global finger always points to a heap region boundary. We |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2991 // use heap_region_containing_raw() to get the containing region |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2992 // given that the global finger could be pointing to a free region |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2993 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2994 // happens, heap_region_containing() will return the bottom of the |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2995 // 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
|
2996 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2997 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2998 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2999 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3000 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3001 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3002 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3003 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3004 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
|
3005 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
|
3006 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3007 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3008 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
|
3009 // 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
|
3010 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
|
3011 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3012 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3013 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3014 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3015 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3016 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3017 } |
342 | 3018 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3019 #endif // PRODUCT |
342 | 3020 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3021 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3022 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3023 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3024 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3025 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3026 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3027 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3028 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3029 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3030 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3031 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3032 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3033 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3034 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3035 _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
|
3036 _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
|
3037 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3038 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3039 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3040 // 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
|
3041 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3042 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3043 // "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
|
3044 // 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
|
3045 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3046 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3047 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3049 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3050 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3051 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3052 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3054 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
|
3055 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3056 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3057 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3058 start, limit, hr->top(), hr->end())); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3059 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3060 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3061 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3062 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3063 // 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
|
3064 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3065 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3066 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3067 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3068 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
|
3069 // '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
|
3070 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
|
3071 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3072 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
|
3073 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
|
3074 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
|
3075 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3076 // 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
|
3077 // 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
|
3078 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3079 // 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
|
3080 // 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
|
3081 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3082 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3083 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
|
3084 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3085 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3086 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3087 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3088 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3089 // 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
|
3090 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3091 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3092 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3093 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
|
3094 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
|
3095 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3096 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3097 // 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
|
3098 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3099 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3100 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3101 // 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:
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|
3102 // into the global card bitmap. |
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|
3103 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
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|
3104 |
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diff
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|
3105 while (scan_idx < limit_idx) { |
d30fa85f9994
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|
3106 assert(task_card_bm->at(scan_idx) == true, "should be"); |
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|
3107 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
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|
3108 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
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|
3109 |
d30fa85f9994
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diff
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|
3110 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
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|
3111 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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diff
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|
3112 // parameter. It does, however, have an early exit if |
4836
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|
3113 // left_offset == right_offset. So let's limit the value |
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diff
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|
3114 // passed in for left offset here. |
d30fa85f9994
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|
3115 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
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|
3116 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
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|
3117 } |
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diff
changeset
|
3118 } |
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diff
changeset
|
3119 |
d30fa85f9994
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diff
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|
3120 // Update the marked bytes for this region. |
d30fa85f9994
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|
3121 hr->add_to_marked_bytes(marked_bytes); |
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|
3122 |
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diff
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|
3123 // Next heap region |
d30fa85f9994
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|
3124 return false; |
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|
3125 } |
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|
3126 }; |
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|
3127 |
d30fa85f9994
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|
3128 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
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|
3129 protected: |
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|
3130 G1CollectedHeap* _g1h; |
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|
3131 ConcurrentMark* _cm; |
d30fa85f9994
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|
3132 BitMap* _cm_card_bm; |
6862
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johnc
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|
3133 uint _max_worker_id; |
4836
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|
3134 int _active_workers; |
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|
3135 |
d30fa85f9994
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diff
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|
3136 public: |
d30fa85f9994
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|
3137 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
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|
3138 ConcurrentMark* cm, |
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|
3139 BitMap* cm_card_bm, |
6862
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johnc
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|
3140 uint max_worker_id, |
4836
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|
3141 int n_workers) : |
d30fa85f9994
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|
3142 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
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|
3143 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
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|
3144 _max_worker_id(max_worker_id), |
4836
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|
3145 _active_workers(n_workers) { } |
d30fa85f9994
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|
3146 |
d30fa85f9994
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diff
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|
3147 void work(uint worker_id) { |
6862
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johnc
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|
3148 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
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|
3149 |
d30fa85f9994
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diff
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|
3150 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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|
3151 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
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|
3152 _active_workers, |
d30fa85f9994
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diff
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|
3153 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
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diff
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|
3154 } else { |
d30fa85f9994
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|
3155 _g1h->heap_region_iterate(&cl); |
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|
3156 } |
d30fa85f9994
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diff
changeset
|
3157 } |
d30fa85f9994
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diff
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|
3158 }; |
d30fa85f9994
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diff
changeset
|
3159 |
d30fa85f9994
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diff
changeset
|
3160 |
d30fa85f9994
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diff
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|
3161 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
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diff
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|
3162 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
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|
3163 _g1h->workers()->active_workers() : |
d30fa85f9994
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parents:
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diff
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|
3164 1); |
d30fa85f9994
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diff
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|
3165 |
d30fa85f9994
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diff
changeset
|
3166 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
3167 _max_worker_id, n_workers); |
4836
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diff
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|
3168 |
d30fa85f9994
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diff
changeset
|
3169 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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parents:
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diff
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|
3170 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
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parents:
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diff
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|
3171 "sanity check"); |
d30fa85f9994
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|
3172 _g1h->set_par_threads(n_workers); |
d30fa85f9994
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|
3173 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
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|
3174 _g1h->set_par_threads(0); |
d30fa85f9994
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diff
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|
3175 |
d30fa85f9994
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diff
changeset
|
3176 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
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diff
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|
3177 "sanity check"); |
d30fa85f9994
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parents:
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diff
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|
3178 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
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|
3179 } else { |
d30fa85f9994
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diff
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|
3180 g1_par_agg_task.work(0); |
d30fa85f9994
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diff
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|
3181 } |
d30fa85f9994
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diff
changeset
|
3182 } |
d30fa85f9994
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diff
changeset
|
3183 |
d30fa85f9994
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diff
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|
3184 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
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|
3185 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
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diff
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|
3186 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
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diff
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|
3187 // liveness count aggregation (during remark) and the |
d30fa85f9994
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diff
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|
3188 // final counting task. |
d30fa85f9994
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diff
changeset
|
3189 _card_bm.clear(); |
d30fa85f9994
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4830
diff
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|
3190 |
d30fa85f9994
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diff
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|
3191 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
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diff
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|
3192 // of the final counting task. |
d30fa85f9994
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diff
changeset
|
3193 _region_bm.clear(); |
d30fa85f9994
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4830
diff
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|
3194 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
3195 uint max_regions = _g1h->max_regions(); |
6862
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|
3196 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
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johnc
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6812
diff
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|
3197 |
8a5ea0a9ccc4
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diff
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|
3198 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
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|
3199 BitMap* task_card_bm = count_card_bitmap_for(i); |
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|
3200 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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|
3201 |
d30fa85f9994
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diff
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|
3202 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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|
3203 assert(marked_bytes_array != NULL, "uninitialized"); |
d30fa85f9994
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|
3204 |
6010
720b6a76dd9d
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6008
diff
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|
3205 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
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|
3206 task_card_bm->clear(); |
d30fa85f9994
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|
3207 } |
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|
3208 } |
d30fa85f9994
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diff
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|
3209 |
342 | 3210 void ConcurrentMark::print_stats() { |
3211 if (verbose_stats()) { | |
3212 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3213 for (size_t i = 0; i < _active_tasks; ++i) { | |
3214 _tasks[i]->print_stats(); | |
3215 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3216 } | |
3217 } | |
3218 } | |
3219 | |
3220 // abandon current marking iteration due to a Full GC | |
3221 void ConcurrentMark::abort() { | |
3222 // Clear all marks to force marking thread to do nothing | |
3223 _nextMarkBitMap->clearAll(); | |
4836
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diff
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|
3224 // Clear the liveness counting data |
d30fa85f9994
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diff
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|
3225 clear_all_count_data(); |
342 | 3226 // Empty mark stack |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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7397
diff
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|
3227 reset_marking_state(); |
6862
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diff
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|
3228 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3229 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
3230 } |
342 | 3231 _has_aborted = true; |
3232 | |
3233 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3234 satb_mq_set.abandon_partial_marking(); | |
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
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1314
diff
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|
3235 // 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
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1314
diff
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|
3236 // the expected_active value from the SATB queue set. |
d4197f8d516a
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tonyp
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1314
diff
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|
3237 satb_mq_set.set_active_all_threads( |
d4197f8d516a
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1314
diff
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|
3238 false, /* new active value */ |
d4197f8d516a
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1314
diff
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|
3239 satb_mq_set.is_active() /* expected_active */); |
10405 | 3240 |
3241 _g1h->trace_heap_after_concurrent_cycle(); | |
3242 _g1h->register_concurrent_cycle_end(); | |
342 | 3243 } |
3244 | |
3245 static void print_ms_time_info(const char* prefix, const char* name, | |
3246 NumberSeq& ns) { | |
3247 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3248 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3249 if (ns.num() > 0) { | |
3250 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3251 prefix, ns.sd(), ns.maximum()); | |
3252 } | |
3253 } | |
3254 | |
3255 void ConcurrentMark::print_summary_info() { | |
3256 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3257 print_ms_time_info(" ", "init marks", _init_times); | |
3258 print_ms_time_info(" ", "remarks", _remark_times); | |
3259 { | |
3260 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3261 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3262 | |
3263 } | |
3264 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3265 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3266 _total_counting_time, | |
3267 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3268 (double)_cleanup_times.num() | |
3269 : 0.0)); | |
3270 if (G1ScrubRemSets) { | |
3271 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3272 _total_rs_scrub_time, | |
3273 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3274 (double)_cleanup_times.num() | |
3275 : 0.0)); | |
3276 } | |
3277 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3278 (_init_times.sum() + _remark_times.sum() + | |
3279 _cleanup_times.sum())/1000.0); | |
3280 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3281 "(%8.2f s marking).", |
342 | 3282 cmThread()->vtime_accum(), |
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3283 cmThread()->vtime_mark_accum()); |
342 | 3284 } |
3285 | |
1019 | 3286 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
8008
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3287 if (use_parallel_marking_threads()) { |
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3288 _parallel_workers->print_worker_threads_on(st); |
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3289 } |
1019 | 3290 } |
3291 | |
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3292 void ConcurrentMark::print_on_error(outputStream* st) const { |
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3293 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
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3294 _prevMarkBitMap, _nextMarkBitMap); |
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3295 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
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3296 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
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3297 } |
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3298 |
342 | 3299 // We take a break if someone is trying to stop the world. |
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3300 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3301 if (should_yield()) { |
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3302 if (worker_id == 0) { |
342 | 3303 _g1h->g1_policy()->record_concurrent_pause(); |
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3304 } |
342 | 3305 cmThread()->yield(); |
3306 return true; | |
3307 } else { | |
3308 return false; | |
3309 } | |
3310 } | |
3311 | |
3312 bool ConcurrentMark::should_yield() { | |
3313 return cmThread()->should_yield(); | |
3314 } | |
3315 | |
3316 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3317 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3318 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3319 } | |
3320 | |
3321 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3322 void* last) { | |
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3323 return containing_card_is_marked(start) && |
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3324 containing_card_is_marked(last); |
342 | 3325 } |
3326 | |
3327 #ifndef PRODUCT | |
3328 // for debugging purposes | |
3329 void ConcurrentMark::print_finger() { | |
3330 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3331 _heap_start, _heap_end, _finger); | |
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3332 for (uint i = 0; i < _max_worker_id; ++i) { |
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3333 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
342 | 3334 } |
3335 gclog_or_tty->print_cr(""); | |
3336 } | |
3337 #endif | |
3338 | |
3771 | 3339 void CMTask::scan_object(oop obj) { |
3340 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3341 | |
3342 if (_cm->verbose_high()) { | |
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3343 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
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3344 _worker_id, (void*) obj); |
3771 | 3345 } |
3346 | |
3347 size_t obj_size = obj->size(); | |
3348 _words_scanned += obj_size; | |
3349 | |
3350 obj->oop_iterate(_cm_oop_closure); | |
3351 statsOnly( ++_objs_scanned ); | |
3352 check_limits(); | |
3353 } | |
3354 | |
342 | 3355 // Closure for iteration over bitmaps |
3356 class CMBitMapClosure : public BitMapClosure { | |
3357 private: | |
3358 // the bitmap that is being iterated over | |
3359 CMBitMap* _nextMarkBitMap; | |
3360 ConcurrentMark* _cm; | |
3361 CMTask* _task; | |
3362 | |
3363 public: | |
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3364 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3365 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3366 |
3367 bool do_bit(size_t offset) { | |
3368 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3369 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3370 assert( addr < _cm->finger(), "invariant"); |
342 | 3371 |
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3372 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3373 assert(addr >= _task->finger(), "invariant"); |
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3374 |
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3375 // We move that task's local finger along. |
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3376 _task->move_finger_to(addr); |
342 | 3377 |
3378 _task->scan_object(oop(addr)); | |
3379 // we only partially drain the local queue and global stack | |
3380 _task->drain_local_queue(true); | |
3381 _task->drain_global_stack(true); | |
3382 | |
3383 // if the has_aborted flag has been raised, we need to bail out of | |
3384 // the iteration | |
3385 return !_task->has_aborted(); | |
3386 } | |
3387 }; | |
3388 | |
3389 // Closure for iterating over objects, currently only used for | |
3390 // processing SATB buffers. | |
3391 class CMObjectClosure : public ObjectClosure { | |
3392 private: | |
3393 CMTask* _task; | |
3394 | |
3395 public: | |
3396 void do_object(oop obj) { | |
3397 _task->deal_with_reference(obj); | |
3398 } | |
3399 | |
3400 CMObjectClosure(CMTask* task) : _task(task) { } | |
3401 }; | |
3402 | |
3771 | 3403 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3404 ConcurrentMark* cm, | |
3405 CMTask* task) | |
3406 : _g1h(g1h), _cm(cm), _task(task) { | |
3407 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3408 | |
3409 if (G1UseConcMarkReferenceProcessing) { | |
3979
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3410 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3411 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3412 } |
3771 | 3413 } |
342 | 3414 |
3415 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3416 // Separated the asserts so that we know which one fires. |
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3417 assert(hr != NULL, |
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3418 "claim_region() should have filtered out continues humongous regions"); |
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3419 assert(!hr->continuesHumongous(), |
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3420 "claim_region() should have filtered out continues humongous regions"); |
342 | 3421 |
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3422 if (_cm->verbose_low()) { |
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3423 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3424 _worker_id, hr); |
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3425 } |
342 | 3426 |
3427 _curr_region = hr; | |
3428 _finger = hr->bottom(); | |
3429 update_region_limit(); | |
3430 } | |
3431 | |
3432 void CMTask::update_region_limit() { | |
3433 HeapRegion* hr = _curr_region; | |
3434 HeapWord* bottom = hr->bottom(); | |
3435 HeapWord* limit = hr->next_top_at_mark_start(); | |
3436 | |
3437 if (limit == bottom) { | |
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3438 if (_cm->verbose_low()) { |
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3439 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3440 "["PTR_FORMAT", "PTR_FORMAT")", |
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3441 _worker_id, bottom, limit); |
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3442 } |
342 | 3443 // The region was collected underneath our feet. |
3444 // We set the finger to bottom to ensure that the bitmap | |
3445 // iteration that will follow this will not do anything. | |
3446 // (this is not a condition that holds when we set the region up, | |
3447 // as the region is not supposed to be empty in the first place) | |
3448 _finger = bottom; | |
3449 } else if (limit >= _region_limit) { | |
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3450 assert(limit >= _finger, "peace of mind"); |
342 | 3451 } else { |
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3452 assert(limit < _region_limit, "only way to get here"); |
342 | 3453 // This can happen under some pretty unusual circumstances. An |
3454 // evacuation pause empties the region underneath our feet (NTAMS | |
3455 // at bottom). We then do some allocation in the region (NTAMS | |
3456 // stays at bottom), followed by the region being used as a GC | |
3457 // alloc region (NTAMS will move to top() and the objects | |
3458 // originally below it will be grayed). All objects now marked in | |
3459 // the region are explicitly grayed, if below the global finger, | |
3460 // and we do not need in fact to scan anything else. So, we simply | |
3461 // set _finger to be limit to ensure that the bitmap iteration | |
3462 // doesn't do anything. | |
3463 _finger = limit; | |
3464 } | |
3465 | |
3466 _region_limit = limit; | |
3467 } | |
3468 | |
3469 void CMTask::giveup_current_region() { | |
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3470 assert(_curr_region != NULL, "invariant"); |
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3471 if (_cm->verbose_low()) { |
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3472 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3473 _worker_id, _curr_region); |
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3474 } |
342 | 3475 clear_region_fields(); |
3476 } | |
3477 | |
3478 void CMTask::clear_region_fields() { | |
3479 // Values for these three fields that indicate that we're not | |
3480 // holding on to a region. | |
3481 _curr_region = NULL; | |
3482 _finger = NULL; | |
3483 _region_limit = NULL; | |
3484 } | |
3485 | |
3771 | 3486 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3487 if (cm_oop_closure == NULL) { | |
3488 assert(_cm_oop_closure != NULL, "invariant"); | |
3489 } else { | |
3490 assert(_cm_oop_closure == NULL, "invariant"); | |
3491 } | |
3492 _cm_oop_closure = cm_oop_closure; | |
3493 } | |
3494 | |
342 | 3495 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3496 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3497 |
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3498 if (_cm->verbose_low()) { |
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3499 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3500 } |
342 | 3501 |
3502 _nextMarkBitMap = nextMarkBitMap; | |
3503 clear_region_fields(); | |
3504 | |
3505 _calls = 0; | |
3506 _elapsed_time_ms = 0.0; | |
3507 _termination_time_ms = 0.0; | |
3508 _termination_start_time_ms = 0.0; | |
3509 | |
3510 #if _MARKING_STATS_ | |
3511 _local_pushes = 0; | |
3512 _local_pops = 0; | |
3513 _local_max_size = 0; | |
3514 _objs_scanned = 0; | |
3515 _global_pushes = 0; | |
3516 _global_pops = 0; | |
3517 _global_max_size = 0; | |
3518 _global_transfers_to = 0; | |
3519 _global_transfers_from = 0; | |
3520 _regions_claimed = 0; | |
3521 _objs_found_on_bitmap = 0; | |
3522 _satb_buffers_processed = 0; | |
3523 _steal_attempts = 0; | |
3524 _steals = 0; | |
3525 _aborted = 0; | |
3526 _aborted_overflow = 0; | |
3527 _aborted_cm_aborted = 0; | |
3528 _aborted_yield = 0; | |
3529 _aborted_timed_out = 0; | |
3530 _aborted_satb = 0; | |
3531 _aborted_termination = 0; | |
3532 #endif // _MARKING_STATS_ | |
3533 } | |
3534 | |
3535 bool CMTask::should_exit_termination() { | |
3536 regular_clock_call(); | |
3537 // This is called when we are in the termination protocol. We should | |
3538 // quit if, for some reason, this task wants to abort or the global | |
3539 // stack is not empty (this means that we can get work from it). | |
3540 return !_cm->mark_stack_empty() || has_aborted(); | |
3541 } | |
3542 | |
3543 void CMTask::reached_limit() { | |
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3544 assert(_words_scanned >= _words_scanned_limit || |
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3545 _refs_reached >= _refs_reached_limit , |
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3546 "shouldn't have been called otherwise"); |
342 | 3547 regular_clock_call(); |
3548 } | |
3549 | |
3550 void CMTask::regular_clock_call() { | |
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3551 if (has_aborted()) return; |
342 | 3552 |
3553 // First, we need to recalculate the words scanned and refs reached | |
3554 // limits for the next clock call. | |
3555 recalculate_limits(); | |
3556 | |
3557 // During the regular clock call we do the following | |
3558 | |
3559 // (1) If an overflow has been flagged, then we abort. | |
3560 if (_cm->has_overflown()) { | |
3561 set_has_aborted(); | |
3562 return; | |
3563 } | |
3564 | |
3565 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3566 // to check anything else. The other steps are only needed during | |
3567 // the concurrent marking phase. | |
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3568 if (!concurrent()) return; |
342 | 3569 |
3570 // (2) If marking has been aborted for Full GC, then we also abort. | |
3571 if (_cm->has_aborted()) { | |
3572 set_has_aborted(); | |
3573 statsOnly( ++_aborted_cm_aborted ); | |
3574 return; | |
3575 } | |
3576 | |
3577 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3578 | |
3579 // (3) If marking stats are enabled, then we update the step history. | |
3580 #if _MARKING_STATS_ | |
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3581 if (_words_scanned >= _words_scanned_limit) { |
342 | 3582 ++_clock_due_to_scanning; |
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3583 } |
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3584 if (_refs_reached >= _refs_reached_limit) { |
342 | 3585 ++_clock_due_to_marking; |
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3586 } |
342 | 3587 |
3588 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3589 _interval_start_time_ms = curr_time_ms; | |
3590 _all_clock_intervals_ms.add(last_interval_ms); | |
3591 | |
3592 if (_cm->verbose_medium()) { | |
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3593 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
3776
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3594 "scanned = %d%s, refs reached = %d%s", |
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3595 _worker_id, last_interval_ms, |
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3596 _words_scanned, |
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3597 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3598 _refs_reached, |
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3599 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3600 } |
3601 #endif // _MARKING_STATS_ | |
3602 | |
3603 // (4) We check whether we should yield. If we have to, then we abort. | |
3604 if (_cm->should_yield()) { | |
3605 // We should yield. To do this we abort the task. The caller is | |
3606 // responsible for yielding. | |
3607 set_has_aborted(); | |
3608 statsOnly( ++_aborted_yield ); | |
3609 return; | |
3610 } | |
3611 | |
3612 // (5) We check whether we've reached our time quota. If we have, | |
3613 // then we abort. | |
3614 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3615 if (elapsed_time_ms > _time_target_ms) { | |
3616 set_has_aborted(); | |
2174
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3617 _has_timed_out = true; |
342 | 3618 statsOnly( ++_aborted_timed_out ); |
3619 return; | |
3620 } | |
3621 | |
3622 // (6) Finally, we check whether there are enough completed STAB | |
3623 // buffers available for processing. If there are, we abort. | |
3624 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3625 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3626 if (_cm->verbose_low()) { |
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3627 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3628 _worker_id); |
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3629 } |
342 | 3630 // we do need to process SATB buffers, we'll abort and restart |
3631 // the marking task to do so | |
3632 set_has_aborted(); | |
3633 statsOnly( ++_aborted_satb ); | |
3634 return; | |
3635 } | |
3636 } | |
3637 | |
3638 void CMTask::recalculate_limits() { | |
3639 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3640 _words_scanned_limit = _real_words_scanned_limit; | |
3641 | |
3642 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3643 _refs_reached_limit = _real_refs_reached_limit; | |
3644 } | |
3645 | |
3646 void CMTask::decrease_limits() { | |
3647 // This is called when we believe that we're going to do an infrequent | |
3648 // operation which will increase the per byte scanned cost (i.e. move | |
3649 // entries to/from the global stack). It basically tries to decrease the | |
3650 // scanning limit so that the clock is called earlier. | |
3651 | |
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3652 if (_cm->verbose_medium()) { |
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3653 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3654 } |
342 | 3655 |
3656 _words_scanned_limit = _real_words_scanned_limit - | |
3657 3 * words_scanned_period / 4; | |
3658 _refs_reached_limit = _real_refs_reached_limit - | |
3659 3 * refs_reached_period / 4; | |
3660 } | |
3661 | |
3662 void CMTask::move_entries_to_global_stack() { | |
3663 // local array where we'll store the entries that will be popped | |
3664 // from the local queue | |
3665 oop buffer[global_stack_transfer_size]; | |
3666 | |
3667 int n = 0; | |
3668 oop obj; | |
3669 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3670 buffer[n] = obj; | |
3671 ++n; | |
3672 } | |
3673 | |
3674 if (n > 0) { | |
3675 // we popped at least one entry from the local queue | |
3676 | |
3677 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3678 | |
3679 if (!_cm->mark_stack_push(buffer, n)) { | |
3776
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3680 if (_cm->verbose_low()) { |
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3681 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3682 _worker_id); |
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3683 } |
342 | 3684 set_has_aborted(); |
3685 } else { | |
3686 // the transfer was successful | |
3687 | |
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3688 if (_cm->verbose_medium()) { |
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3689 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3690 _worker_id, n); |
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3691 } |
342 | 3692 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3693 if (tmp_size > _global_max_size) { |
342 | 3694 _global_max_size = tmp_size; |
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3695 } |
342 | 3696 _global_pushes += n ); |
3697 } | |
3698 } | |
3699 | |
3700 // this operation was quite expensive, so decrease the limits | |
3701 decrease_limits(); | |
3702 } | |
3703 | |
3704 void CMTask::get_entries_from_global_stack() { | |
3705 // local array where we'll store the entries that will be popped | |
3706 // from the global stack. | |
3707 oop buffer[global_stack_transfer_size]; | |
3708 int n; | |
3709 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3710 assert(n <= global_stack_transfer_size, |
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3711 "we should not pop more than the given limit"); |
342 | 3712 if (n > 0) { |
3713 // yes, we did actually pop at least one entry | |
3714 | |
3715 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3716 if (_cm->verbose_medium()) { |
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3717 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3718 _worker_id, n); |
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3719 } |
342 | 3720 for (int i = 0; i < n; ++i) { |
3721 bool success = _task_queue->push(buffer[i]); | |
3722 // We only call this when the local queue is empty or under a | |
3723 // given target limit. So, we do not expect this push to fail. | |
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3724 assert(success, "invariant"); |
342 | 3725 } |
3726 | |
3727 statsOnly( int tmp_size = _task_queue->size(); | |
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3728 if (tmp_size > _local_max_size) { |
342 | 3729 _local_max_size = tmp_size; |
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3730 } |
342 | 3731 _local_pushes += n ); |
3732 } | |
3733 | |
3734 // this operation was quite expensive, so decrease the limits | |
3735 decrease_limits(); | |
3736 } | |
3737 | |
3738 void CMTask::drain_local_queue(bool partially) { | |
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3739 if (has_aborted()) return; |
342 | 3740 |
3741 // Decide what the target size is, depending whether we're going to | |
3742 // drain it partially (so that other tasks can steal if they run out | |
3743 // of things to do) or totally (at the very end). | |
3744 size_t target_size; | |
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3745 if (partially) { |
342 | 3746 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3747 } else { |
342 | 3748 target_size = 0; |
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3749 } |
342 | 3750 |
3751 if (_task_queue->size() > target_size) { | |
3776
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|
3752 if (_cm->verbose_high()) { |
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3753 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
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3754 _worker_id, target_size); |
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|
3755 } |
342 | 3756 |
3757 oop obj; | |
3758 bool ret = _task_queue->pop_local(obj); | |
3759 while (ret) { | |
3760 statsOnly( ++_local_pops ); | |
3761 | |
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|
3762 if (_cm->verbose_high()) { |
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|
3763 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
342 | 3764 (void*) obj); |
3776
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|
3765 } |
342 | 3766 |
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|
3767 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3768 assert(!_g1h->is_on_master_free_list( |
2152 | 3769 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3770 |
3771 scan_object(obj); | |
3772 | |
3776
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|
3773 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3774 ret = false; |
3776
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|
3775 } else { |
342 | 3776 ret = _task_queue->pop_local(obj); |
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3777 } |
342 | 3778 } |
3779 | |
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|
3780 if (_cm->verbose_high()) { |
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|
3781 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3782 _worker_id, _task_queue->size()); |
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|
3783 } |
342 | 3784 } |
3785 } | |
3786 | |
3787 void CMTask::drain_global_stack(bool partially) { | |
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|
3788 if (has_aborted()) return; |
342 | 3789 |
3790 // We have a policy to drain the local queue before we attempt to | |
3791 // drain the global stack. | |
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3792 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3793 |
3794 // Decide what the target size is, depending whether we're going to | |
3795 // drain it partially (so that other tasks can steal if they run out | |
3796 // of things to do) or totally (at the very end). Notice that, | |
3797 // because we move entries from the global stack in chunks or | |
3798 // because another task might be doing the same, we might in fact | |
3799 // drop below the target. But, this is not a problem. | |
3800 size_t target_size; | |
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|
3801 if (partially) { |
342 | 3802 target_size = _cm->partial_mark_stack_size_target(); |
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3803 } else { |
342 | 3804 target_size = 0; |
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3805 } |
342 | 3806 |
3807 if (_cm->mark_stack_size() > target_size) { | |
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|
3808 if (_cm->verbose_low()) { |
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3809 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
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3810 _worker_id, target_size); |
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3811 } |
342 | 3812 |
3813 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3814 get_entries_from_global_stack(); | |
3815 drain_local_queue(partially); | |
3816 } | |
3817 | |
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|
3818 if (_cm->verbose_low()) { |
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3819 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
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3820 _worker_id, _cm->mark_stack_size()); |
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3821 } |
342 | 3822 } |
3823 } | |
3824 | |
3825 // SATB Queue has several assumptions on whether to call the par or | |
3826 // non-par versions of the methods. this is why some of the code is | |
3827 // replicated. We should really get rid of the single-threaded version | |
3828 // of the code to simplify things. | |
3829 void CMTask::drain_satb_buffers() { | |
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3830 if (has_aborted()) return; |
342 | 3831 |
3832 // We set this so that the regular clock knows that we're in the | |
3833 // middle of draining buffers and doesn't set the abort flag when it | |
3834 // notices that SATB buffers are available for draining. It'd be | |
3835 // very counter productive if it did that. :-) | |
3836 _draining_satb_buffers = true; | |
3837 | |
3838 CMObjectClosure oc(this); | |
3839 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3840 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3841 satb_mq_set.set_par_closure(_worker_id, &oc); |
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3842 } else { |
342 | 3843 satb_mq_set.set_closure(&oc); |
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|
3844 } |
342 | 3845 |
3846 // This keeps claiming and applying the closure to completed buffers | |
3847 // until we run out of buffers or we need to abort. | |
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3848 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3849 while (!has_aborted() && |
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3850 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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3851 if (_cm->verbose_medium()) { |
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3852 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3853 } |
342 | 3854 statsOnly( ++_satb_buffers_processed ); |
3855 regular_clock_call(); | |
3856 } | |
3857 } else { | |
3858 while (!has_aborted() && | |
3859 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3860 if (_cm->verbose_medium()) { |
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3861 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3862 } |
342 | 3863 statsOnly( ++_satb_buffers_processed ); |
3864 regular_clock_call(); | |
3865 } | |
3866 } | |
3867 | |
3868 if (!concurrent() && !has_aborted()) { | |
3869 // We should only do this during remark. | |
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3870 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3871 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
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3872 } else { |
342 | 3873 satb_mq_set.iterate_closure_all_threads(); |
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3874 } |
342 | 3875 } |
3876 | |
3877 _draining_satb_buffers = false; | |
3878 | |
1023
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3879 assert(has_aborted() || |
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3880 concurrent() || |
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3881 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3882 |
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3883 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3884 satb_mq_set.set_par_closure(_worker_id, NULL); |
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3885 } else { |
342 | 3886 satb_mq_set.set_closure(NULL); |
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3887 } |
342 | 3888 |
3889 // again, this was a potentially expensive operation, decrease the | |
3890 // limits to get the regular clock call early | |
3891 decrease_limits(); | |
3892 } | |
3893 | |
3894 void CMTask::print_stats() { | |
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3895 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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3896 _worker_id, _calls); |
342 | 3897 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
3898 _elapsed_time_ms, _termination_time_ms); | |
3899 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3900 _step_times_ms.num(), _step_times_ms.avg(), | |
3901 _step_times_ms.sd()); | |
3902 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3903 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3904 | |
3905 #if _MARKING_STATS_ | |
3906 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3907 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3908 _all_clock_intervals_ms.sd()); | |
3909 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3910 _all_clock_intervals_ms.maximum(), | |
3911 _all_clock_intervals_ms.sum()); | |
3912 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3913 _clock_due_to_scanning, _clock_due_to_marking); | |
3914 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3915 _objs_scanned, _objs_found_on_bitmap); | |
3916 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3917 _local_pushes, _local_pops, _local_max_size); | |
3918 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3919 _global_pushes, _global_pops, _global_max_size); | |
3920 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3921 _global_transfers_to,_global_transfers_from); | |
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3922 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3923 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3924 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3925 _steal_attempts, _steals); | |
3926 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3927 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3928 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3929 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3930 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3931 #endif // _MARKING_STATS_ | |
3932 } | |
3933 | |
3934 /***************************************************************************** | |
3935 | |
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3936 The do_marking_step(time_target_ms, ...) method is the building |
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3937 block of the parallel marking framework. It can be called in parallel |
342 | 3938 with other invocations of do_marking_step() on different tasks |
3939 (but only one per task, obviously) and concurrently with the | |
3940 mutator threads, or during remark, hence it eliminates the need | |
3941 for two versions of the code. When called during remark, it will | |
3942 pick up from where the task left off during the concurrent marking | |
3943 phase. Interestingly, tasks are also claimable during evacuation | |
3944 pauses too, since do_marking_step() ensures that it aborts before | |
3945 it needs to yield. | |
3946 | |
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3947 The data structures that it uses to do marking work are the |
342 | 3948 following: |
3949 | |
3950 (1) Marking Bitmap. If there are gray objects that appear only | |
3951 on the bitmap (this happens either when dealing with an overflow | |
3952 or when the initial marking phase has simply marked the roots | |
3953 and didn't push them on the stack), then tasks claim heap | |
3954 regions whose bitmap they then scan to find gray objects. A | |
3955 global finger indicates where the end of the last claimed region | |
3956 is. A local finger indicates how far into the region a task has | |
3957 scanned. The two fingers are used to determine how to gray an | |
3958 object (i.e. whether simply marking it is OK, as it will be | |
3959 visited by a task in the future, or whether it needs to be also | |
3960 pushed on a stack). | |
3961 | |
3962 (2) Local Queue. The local queue of the task which is accessed | |
3963 reasonably efficiently by the task. Other tasks can steal from | |
3964 it when they run out of work. Throughout the marking phase, a | |
3965 task attempts to keep its local queue short but not totally | |
3966 empty, so that entries are available for stealing by other | |
3967 tasks. Only when there is no more work, a task will totally | |
3968 drain its local queue. | |
3969 | |
3970 (3) Global Mark Stack. This handles local queue overflow. During | |
3971 marking only sets of entries are moved between it and the local | |
3972 queues, as access to it requires a mutex and more fine-grain | |
3973 interaction with it which might cause contention. If it | |
3974 overflows, then the marking phase should restart and iterate | |
3975 over the bitmap to identify gray objects. Throughout the marking | |
3976 phase, tasks attempt to keep the global mark stack at a small | |
3977 length but not totally empty, so that entries are available for | |
3978 popping by other tasks. Only when there is no more work, tasks | |
3979 will totally drain the global mark stack. | |
3980 | |
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3981 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 3982 made available. Buffers are regularly removed from this queue |
3983 and scanned for roots, so that the queue doesn't get too | |
3984 long. During remark, all completed buffers are processed, as | |
3985 well as the filled in parts of any uncompleted buffers. | |
3986 | |
3987 The do_marking_step() method tries to abort when the time target | |
3988 has been reached. There are a few other cases when the | |
3989 do_marking_step() method also aborts: | |
3990 | |
3991 (1) When the marking phase has been aborted (after a Full GC). | |
3992 | |
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3993 (2) When a global overflow (on the global stack) has been |
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3994 triggered. Before the task aborts, it will actually sync up with |
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3995 the other tasks to ensure that all the marking data structures |
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3996 (local queues, stacks, fingers etc.) are re-initialized so that |
5988
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3997 when do_marking_step() completes, the marking phase can |
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3998 immediately restart. |
342 | 3999 |
4000 (3) When enough completed SATB buffers are available. The | |
4001 do_marking_step() method only tries to drain SATB buffers right | |
4002 at the beginning. So, if enough buffers are available, the | |
4003 marking step aborts and the SATB buffers are processed at | |
4004 the beginning of the next invocation. | |
4005 | |
4006 (4) To yield. when we have to yield then we abort and yield | |
4007 right at the end of do_marking_step(). This saves us from a lot | |
4008 of hassle as, by yielding we might allow a Full GC. If this | |
4009 happens then objects will be compacted underneath our feet, the | |
4010 heap might shrink, etc. We save checking for this by just | |
4011 aborting and doing the yield right at the end. | |
4012 | |
4013 From the above it follows that the do_marking_step() method should | |
4014 be called in a loop (or, otherwise, regularly) until it completes. | |
4015 | |
4016 If a marking step completes without its has_aborted() flag being | |
4017 true, it means it has completed the current marking phase (and | |
4018 also all other marking tasks have done so and have all synced up). | |
4019 | |
4020 A method called regular_clock_call() is invoked "regularly" (in | |
4021 sub ms intervals) throughout marking. It is this clock method that | |
4022 checks all the abort conditions which were mentioned above and | |
4023 decides when the task should abort. A work-based scheme is used to | |
4024 trigger this clock method: when the number of object words the | |
4025 marking phase has scanned or the number of references the marking | |
4026 phase has visited reach a given limit. Additional invocations to | |
4027 the method clock have been planted in a few other strategic places | |
4028 too. The initial reason for the clock method was to avoid calling | |
4029 vtime too regularly, as it is quite expensive. So, once it was in | |
4030 place, it was natural to piggy-back all the other conditions on it | |
4031 too and not constantly check them throughout the code. | |
4032 | |
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4033 If do_termination is true then do_marking_step will enter its |
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4034 termination protocol. |
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4035 |
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4036 The value of is_serial must be true when do_marking_step is being |
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4037 called serially (i.e. by the VMThread) and do_marking_step should |
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4038 skip any synchronization in the termination and overflow code. |
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4039 Examples include the serial remark code and the serial reference |
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4040 processing closures. |
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4041 |
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4042 The value of is_serial must be false when do_marking_step is |
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4043 being called by any of the worker threads in a work gang. |
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4044 Examples include the concurrent marking code (CMMarkingTask), |
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4045 the MT remark code, and the MT reference processing closures. |
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4046 |
342 | 4047 *****************************************************************************/ |
4048 | |
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4049 void CMTask::do_marking_step(double time_target_ms, |
8787
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4050 bool do_termination, |
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4051 bool is_serial) { |
1023
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4052 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4053 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4054 |
342 | 4055 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
1023
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4056 assert(_task_queues != NULL, "invariant"); |
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4057 assert(_task_queue != NULL, "invariant"); |
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4058 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
1023
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4059 |
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4060 assert(!_claimed, |
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4061 "only one thread should claim this task at any one time"); |
342 | 4062 |
4063 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4064 // possible for two threads to set the _claimed flag at the same | |
4065 // time. But it is only for debugging purposes anyway and it will | |
4066 // catch most problems. | |
4067 _claimed = true; | |
4068 | |
4069 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4070 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4071 | |
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4072 // If do_stealing is true then do_marking_step will attempt to |
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4073 // steal work from the other CMTasks. It only makes sense to |
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4074 // enable stealing when the termination protocol is enabled |
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4075 // and do_marking_step() is not being called serially. |
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4076 bool do_stealing = do_termination && !is_serial; |
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4077 |
342 | 4078 double diff_prediction_ms = |
4079 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4080 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4081 | |
4082 // set up the variables that are used in the work-based scheme to | |
4083 // call the regular clock method | |
4084 _words_scanned = 0; | |
4085 _refs_reached = 0; | |
4086 recalculate_limits(); | |
4087 | |
4088 // clear all flags | |
4089 clear_has_aborted(); | |
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4090 _has_timed_out = false; |
342 | 4091 _draining_satb_buffers = false; |
4092 | |
4093 ++_calls; | |
4094 | |
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4095 if (_cm->verbose_low()) { |
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4096 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4097 "target = %1.2lfms >>>>>>>>>>", |
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4098 _worker_id, _calls, _time_target_ms); |
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4099 } |
342 | 4100 |
4101 // Set up the bitmap and oop closures. Anything that uses them is | |
4102 // eventually called from this method, so it is OK to allocate these | |
4103 // statically. | |
4104 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4105 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4106 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4107 |
4108 if (_cm->has_overflown()) { | |
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4109 // This can happen if the mark stack overflows during a GC pause |
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4110 // and this task, after a yield point, restarts. We have to abort |
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4111 // as we need to get into the overflow protocol which happens |
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4112 // right at the end of this task. |
342 | 4113 set_has_aborted(); |
4114 } | |
4115 | |
4116 // First drain any available SATB buffers. After this, we will not | |
4117 // look at SATB buffers before the next invocation of this method. | |
4118 // If enough completed SATB buffers are queued up, the regular clock | |
4119 // will abort this task so that it restarts. | |
4120 drain_satb_buffers(); | |
4121 // ...then partially drain the local queue and the global stack | |
4122 drain_local_queue(true); | |
4123 drain_global_stack(true); | |
4124 | |
4125 do { | |
4126 if (!has_aborted() && _curr_region != NULL) { | |
4127 // This means that we're already holding on to a region. | |
1023
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4128 assert(_finger != NULL, "if region is not NULL, then the finger " |
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|
4129 "should not be NULL either"); |
342 | 4130 |
4131 // We might have restarted this task after an evacuation pause | |
4132 // which might have evacuated the region we're holding on to | |
4133 // underneath our feet. Let's read its limit again to make sure | |
4134 // that we do not iterate over a region of the heap that | |
4135 // contains garbage (update_region_limit() will also move | |
4136 // _finger to the start of the region if it is found empty). | |
4137 update_region_limit(); | |
4138 // We will start from _finger not from the start of the region, | |
4139 // as we might be restarting this task after aborting half-way | |
4140 // through scanning this region. In this case, _finger points to | |
4141 // the address where we last found a marked object. If this is a | |
4142 // fresh region, _finger points to start(). | |
4143 MemRegion mr = MemRegion(_finger, _region_limit); | |
4144 | |
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4145 if (_cm->verbose_low()) { |
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|
4146 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4147 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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|
4148 "of region "HR_FORMAT, |
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4149 _worker_id, _finger, _region_limit, |
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4150 HR_FORMAT_PARAMS(_curr_region)); |
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4151 } |
342 | 4152 |
8039
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|
4153 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
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|
4154 "humongous regions should go around loop once only"); |
5e401ef52ec0
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|
4155 |
5e401ef52ec0
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4156 // Some special cases: |
5e401ef52ec0
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4157 // 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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4158 // If the current region is humongous then we only need to check |
5e401ef52ec0
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4159 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
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|
4160 // scan the object if it's live, and give up the region. |
5e401ef52ec0
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|
4161 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
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|
4162 // that is left. |
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7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
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|
4163 // If the iteration is successful, give up the region. |
8039
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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|
4164 if (mr.is_empty()) { |
5e401ef52ec0
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|
4165 giveup_current_region(); |
5e401ef52ec0
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|
4166 regular_clock_call(); |
5e401ef52ec0
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|
4167 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
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|
4168 if (_nextMarkBitMap->isMarked(mr.start())) { |
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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|
4169 // The object is marked - apply the closure |
5e401ef52ec0
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|
4170 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
5e401ef52ec0
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|
4171 bitmap_closure.do_bit(offset); |
5e401ef52ec0
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|
4172 } |
5e401ef52ec0
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4173 // Even if this task aborted while scanning the humongous object |
5e401ef52ec0
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|
4174 // we can (and should) give up the current region. |
5e401ef52ec0
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|
4175 giveup_current_region(); |
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|
4176 regular_clock_call(); |
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|
4177 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4178 giveup_current_region(); |
4179 regular_clock_call(); | |
4180 } else { | |
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4181 assert(has_aborted(), "currently the only way to do so"); |
342 | 4182 // The only way to abort the bitmap iteration is to return |
4183 // false from the do_bit() method. However, inside the | |
4184 // do_bit() method we move the _finger to point to the | |
4185 // object currently being looked at. So, if we bail out, we | |
4186 // have definitely set _finger to something non-null. | |
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4187 assert(_finger != NULL, "invariant"); |
342 | 4188 |
4189 // Region iteration was actually aborted. So now _finger | |
4190 // points to the address of the object we last scanned. If we | |
4191 // leave it there, when we restart this task, we will rescan | |
4192 // the object. It is easy to avoid this. We move the finger by | |
4193 // enough to point to the next possible object header (the | |
4194 // bitmap knows by how much we need to move it as it knows its | |
4195 // granularity). | |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4196 assert(_finger < _region_limit, "invariant"); |
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
tamao
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|
4197 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4198 // 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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|
4199 if (new_finger >= _region_limit) { |
5988
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|
4200 giveup_current_region(); |
1314
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apetrusenko
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|
4201 } else { |
5988
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|
4202 move_finger_to(new_finger); |
1314
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|
4203 } |
342 | 4204 } |
4205 } | |
4206 // At this point we have either completed iterating over the | |
4207 // region we were holding on to, or we have aborted. | |
4208 | |
4209 // We then partially drain the local queue and the global stack. | |
4210 // (Do we really need this?) | |
4211 drain_local_queue(true); | |
4212 drain_global_stack(true); | |
4213 | |
4214 // Read the note on the claim_region() method on why it might | |
4215 // return NULL with potentially more regions available for | |
4216 // claiming and why we have to check out_of_regions() to determine | |
4217 // whether we're done or not. | |
4218 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4219 // We are going to try to claim a new region. We should have | |
4220 // given up on the previous one. | |
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|
4221 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
4222 assert(_curr_region == NULL, "invariant"); |
11d4857fe5e1
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|
4223 assert(_finger == NULL, "invariant"); |
11d4857fe5e1
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|
4224 assert(_region_limit == NULL, "invariant"); |
3776
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|
4225 if (_cm->verbose_low()) { |
6862
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|
4226 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
3776
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|
4227 } |
6862
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|
4228 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4229 if (claimed_region != NULL) { |
4230 // Yes, we managed to claim one | |
4231 statsOnly( ++_regions_claimed ); | |
4232 | |
3776
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|
4233 if (_cm->verbose_low()) { |
6862
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|
4234 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4235 "region "PTR_FORMAT, |
6862
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|
4236 _worker_id, claimed_region); |
3776
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|
4237 } |
342 | 4238 |
4239 setup_for_region(claimed_region); | |
1023
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|
4240 assert(_curr_region == claimed_region, "invariant"); |
342 | 4241 } |
4242 // It is important to call the regular clock here. It might take | |
4243 // a while to claim a region if, for example, we hit a large | |
4244 // block of empty regions. So we need to call the regular clock | |
4245 // method once round the loop to make sure it's called | |
4246 // frequently enough. | |
4247 regular_clock_call(); | |
4248 } | |
4249 | |
4250 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
4251 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4252 "at this point we should be out of regions"); |
342 | 4253 } |
4254 } while ( _curr_region != NULL && !has_aborted()); | |
4255 | |
4256 if (!has_aborted()) { | |
4257 // We cannot check whether the global stack is empty, since other | |
5988
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|
4258 // tasks might be pushing objects to it concurrently. |
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|
4259 assert(_cm->out_of_regions(), |
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|
4260 "at this point we should be out of regions"); |
342 | 4261 |
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|
4262 if (_cm->verbose_low()) { |
6862
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|
4263 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
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|
4264 } |
342 | 4265 |
4266 // Try to reduce the number of available SATB buffers so that | |
4267 // remark has less work to do. | |
4268 drain_satb_buffers(); | |
4269 } | |
4270 | |
4271 // Since we've done everything else, we can now totally drain the | |
4272 // local queue and global stack. | |
4273 drain_local_queue(false); | |
4274 drain_global_stack(false); | |
4275 | |
4276 // Attempt at work stealing from other task's queues. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4277 if (do_stealing && !has_aborted()) { |
342 | 4278 // We have not aborted. This means that we have finished all that |
4279 // we could. Let's try to do some stealing... | |
4280 | |
4281 // We cannot check whether the global stack is empty, since other | |
5988
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|
4282 // tasks might be pushing objects to it concurrently. |
1023
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|
4283 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
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|
4284 "only way to reach here"); |
342 | 4285 |
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|
4286 if (_cm->verbose_low()) { |
6862
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|
4287 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
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|
4288 } |
342 | 4289 |
4290 while (!has_aborted()) { | |
4291 oop obj; | |
4292 statsOnly( ++_steal_attempts ); | |
4293 | |
6862
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|
4294 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
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|
4295 if (_cm->verbose_medium()) { |
6862
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|
4296 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4297 _worker_id, (void*) obj); |
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|
4298 } |
342 | 4299 |
4300 statsOnly( ++_steals ); | |
4301 | |
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|
4302 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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|
4303 "any stolen object should be marked"); |
342 | 4304 scan_object(obj); |
4305 | |
4306 // And since we're towards the end, let's totally drain the | |
4307 // local queue and global stack. | |
4308 drain_local_queue(false); | |
4309 drain_global_stack(false); | |
4310 } else { | |
4311 break; | |
4312 } | |
4313 } | |
4314 } | |
4315 | |
3316
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
changeset
|
4316 // 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
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diff
changeset
|
4317 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4318 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
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tonyp
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|
4319 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
|
4320 _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
|
4321 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
|
4322 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4323 } |
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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|
4324 |
342 | 4325 // We still haven't aborted. Now, let's try to get into the |
4326 // termination protocol. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4327 if (do_termination && !has_aborted()) { |
342 | 4328 // 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
|
4329 // 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
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|
4330 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
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diff
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|
4331 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4332 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4333 |
3776
23d434c6290d
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diff
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|
4334 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
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|
4335 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
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|
4336 } |
342 | 4337 |
4338 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
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|
4339 |
342 | 4340 // The CMTask class also extends the TerminatorTerminator class, |
4341 // hence its should_exit_termination() method will also decide | |
4342 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4343 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4344 _cm->terminator()->offer_termination(this)); |
342 | 4345 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4346 _termination_time_ms += | |
4347 termination_end_time_ms - _termination_start_time_ms; | |
4348 | |
4349 if (finished) { | |
4350 // We're all done. | |
4351 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
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|
4352 if (_worker_id == 0) { |
342 | 4353 // let's allow task 0 to do this |
4354 if (concurrent()) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4355 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4356 // we need to set this to false before the next |
4357 // safepoint. This way we ensure that the marking phase | |
4358 // doesn't observe any more heap expansions. | |
4359 _cm->clear_concurrent_marking_in_progress(); | |
4360 } | |
4361 } | |
4362 | |
4363 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4364 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4365 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4366 // which one. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
changeset
|
4367 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
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|
4368 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
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diff
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|
4369 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
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|
4370 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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diff
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|
4371 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4372 |
3776
23d434c6290d
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|
4373 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
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|
4374 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
23d434c6290d
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|
4375 } |
342 | 4376 } else { |
4377 // Apparently there's more work to do. Let's abort this task. It | |
4378 // will restart it and we can hopefully find more things to do. | |
4379 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
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|
4380 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
changeset
|
4381 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4382 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
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|
4383 } |
342 | 4384 |
4385 set_has_aborted(); | |
4386 statsOnly( ++_aborted_termination ); | |
4387 } | |
4388 } | |
4389 | |
4390 // Mainly for debugging purposes to make sure that a pointer to the | |
4391 // closure which was statically allocated in this frame doesn't | |
4392 // escape it by accident. | |
3771 | 4393 set_cm_oop_closure(NULL); |
342 | 4394 double end_time_ms = os::elapsedVTime() * 1000.0; |
4395 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4396 // Update the step history. | |
4397 _step_times_ms.add(elapsed_time_ms); | |
4398 | |
4399 if (has_aborted()) { | |
4400 // The task was aborted for some reason. | |
4401 | |
4402 statsOnly( ++_aborted ); | |
4403 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
4404 if (_has_timed_out) { |
342 | 4405 double diff_ms = elapsed_time_ms - _time_target_ms; |
4406 // Keep statistics of how well we did with respect to hitting | |
4407 // our target only if we actually timed out (if we aborted for | |
4408 // other reasons, then the results might get skewed). | |
4409 _marking_step_diffs_ms.add(diff_ms); | |
4410 } | |
4411 | |
4412 if (_cm->has_overflown()) { | |
4413 // This is the interesting one. We aborted because a global | |
4414 // overflow was raised. This means we have to restart the | |
4415 // marking phase and start iterating over regions. However, in | |
4416 // order to do this we have to make sure that all tasks stop | |
4417 // what they are doing and re-initialise in a safe manner. We | |
4418 // will achieve this with the use of two barrier sync points. | |
4419 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
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|
4420 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
6812
diff
changeset
|
4421 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4422 } |
342 | 4423 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4424 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4425 // We only need to enter the sync barrier if being called |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4426 // from a parallel context |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4427 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4428 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4429 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4430 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4431 // 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
|
4432 // task 0 will clear the global data structures. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4433 } |
342 | 4434 |
4435 statsOnly( ++_aborted_overflow ); | |
4436 | |
4437 // We clear the local state of this task... | |
4438 clear_region_fields(); | |
4439 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4440 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4441 // ...and enter the second barrier. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4442 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4443 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4444 // 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
|
4445 // marking, everything has been re-initialized and we're |
342 | 4446 // ready to restart. |
4447 } | |
4448 | |
4449 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4450 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4451 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4452 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4453 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4454 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
|
4455 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4456 } |
342 | 4457 } |
4458 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4459 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4460 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4461 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4462 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4463 } |
342 | 4464 } |
4465 | |
4466 _claimed = false; | |
4467 } | |
4468 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4469 CMTask::CMTask(uint worker_id, |
342 | 4470 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4471 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4472 BitMap* card_bm, |
342 | 4473 CMTaskQueue* task_queue, |
4474 CMTaskQueueSet* task_queues) | |
4475 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4476 _worker_id(worker_id), _cm(cm), |
342 | 4477 _claimed(false), |
4478 _nextMarkBitMap(NULL), _hash_seed(17), | |
4479 _task_queue(task_queue), | |
4480 _task_queues(task_queues), | |
3771 | 4481 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4482 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4483 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
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|
4484 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4485 guarantee(task_queues != NULL, "invariant"); |
342 | 4486 |
4487 statsOnly( _clock_due_to_scanning = 0; | |
4488 _clock_due_to_marking = 0 ); | |
4489 | |
4490 _marking_step_diffs_ms.add(0.5); | |
4491 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
4492 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4493 // 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
|
4494 // 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
|
4495 // 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
|
4496 // 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
|
4497 // 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
|
4498 // 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
|
4499 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4500 // 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
|
4501 // 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
|
4502 #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
|
4503 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4504 #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
|
4505 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4506 #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:
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diff
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|
4507 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4508 #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
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2369
diff
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|
4509 #endif // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4510 |
371bbc844bf1
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diff
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|
4511 // For per-region info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4512 #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
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|
4513 #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
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|
4514 #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
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|
4515 #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
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|
4516 #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
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|
4517 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4518 |
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|
4519 // For summary info |
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|
4520 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4521 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4522 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4523 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4524 |
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|
4525 G1PrintRegionLivenessInfoClosure:: |
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|
4526 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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|
4527 : _out(out), |
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|
4528 _total_used_bytes(0), _total_capacity_bytes(0), |
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|
4529 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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|
4530 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4531 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
12080 | 4532 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
2435
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|
4533 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
4534 MemRegion g1_committed = g1h->g1_committed(); |
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|
4535 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4536 double now = os::elapsedTime(); |
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|
4537 |
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|
4538 // Print the header of the output. |
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|
4539 _out->cr(); |
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|
4540 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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|
4541 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4542 G1PPRL_SUM_ADDR_FORMAT("committed") |
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|
4543 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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4544 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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|
4545 g1_committed.start(), g1_committed.end(), |
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|
4546 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
4547 HeapRegion::GrainBytes); |
2435
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|
4548 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4549 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4550 G1PPRL_TYPE_H_FORMAT |
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|
4551 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4552 G1PPRL_BYTE_H_FORMAT |
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|
4553 G1PPRL_BYTE_H_FORMAT |
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|
4554 G1PPRL_BYTE_H_FORMAT |
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|
4555 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4556 G1PPRL_BYTE_H_FORMAT |
10290
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|
4557 G1PPRL_BYTE_H_FORMAT, |
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|
4558 "type", "address-range", |
12080 | 4559 "used", "prev-live", "next-live", "gc-eff", |
4560 "remset", "code-roots"); | |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
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|
4561 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
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|
4562 G1PPRL_TYPE_H_FORMAT |
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|
4563 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4564 G1PPRL_BYTE_H_FORMAT |
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|
4565 G1PPRL_BYTE_H_FORMAT |
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|
4566 G1PPRL_BYTE_H_FORMAT |
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|
4567 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4568 G1PPRL_BYTE_H_FORMAT |
10290
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|
4569 G1PPRL_BYTE_H_FORMAT, |
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|
4570 "", "", |
12080 | 4571 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
4572 "(bytes)", "(bytes)"); | |
2435
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|
4573 } |
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|
4574 |
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|
4575 // It takes as a parameter a reference to one of the _hum_* fields, it |
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|
4576 // deduces the corresponding value for a region in a humongous region |
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|
4577 // series (either the region size, or what's left if the _hum_* field |
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|
4578 // is < the region size), and updates the _hum_* field accordingly. |
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|
4579 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4580 size_t bytes = 0; |
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|
4581 // The > 0 check is to deal with the prev and next live bytes which |
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|
4582 // could be 0. |
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|
4583 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
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|
4584 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
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|
4585 *hum_bytes -= bytes; |
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|
4586 } |
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|
4587 return bytes; |
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|
4588 } |
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|
4589 |
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|
4590 // It deduces the values for a region in a humongous region series |
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|
4591 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
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|
4592 // that that _hum_* fields have already been set up from the "starts |
371bbc844bf1
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|
4593 // humongous" region and we visit the regions in address order. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4594 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4595 size_t* capacity_bytes, |
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|
4596 size_t* prev_live_bytes, |
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|
4597 size_t* next_live_bytes) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4598 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4599 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4600 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4601 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4602 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4603 } |
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|
4604 |
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|
4605 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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|
4606 const char* type = ""; |
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|
4607 HeapWord* bottom = r->bottom(); |
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|
4608 HeapWord* end = r->end(); |
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|
4609 size_t capacity_bytes = r->capacity(); |
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|
4610 size_t used_bytes = r->used(); |
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|
4611 size_t prev_live_bytes = r->live_bytes(); |
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|
4612 size_t next_live_bytes = r->next_live_bytes(); |
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|
4613 double gc_eff = r->gc_efficiency(); |
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|
4614 size_t remset_bytes = r->rem_set()->mem_size(); |
12080 | 4615 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
4616 | |
2435
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|
4617 if (r->used() == 0) { |
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|
4618 type = "FREE"; |
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|
4619 } else if (r->is_survivor()) { |
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diff
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|
4620 type = "SURV"; |
371bbc844bf1
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diff
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|
4621 } else if (r->is_young()) { |
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|
4622 type = "EDEN"; |
371bbc844bf1
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diff
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|
4623 } else if (r->startsHumongous()) { |
371bbc844bf1
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diff
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|
4624 type = "HUMS"; |
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|
4625 |
371bbc844bf1
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|
4626 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4627 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
4628 "they should have been zeroed after the last time we used them"); |
371bbc844bf1
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|
4629 // Set up the _hum_* fields. |
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|
4630 _hum_capacity_bytes = capacity_bytes; |
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|
4631 _hum_used_bytes = used_bytes; |
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|
4632 _hum_prev_live_bytes = prev_live_bytes; |
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|
4633 _hum_next_live_bytes = next_live_bytes; |
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|
4634 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4635 &prev_live_bytes, &next_live_bytes); |
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4636 end = bottom + HeapRegion::GrainWords; |
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4637 } else if (r->continuesHumongous()) { |
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4638 type = "HUMC"; |
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4639 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4640 &prev_live_bytes, &next_live_bytes); |
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4641 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4642 } else { |
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4643 type = "OLD"; |
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4644 } |
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4645 |
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4646 _total_used_bytes += used_bytes; |
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4647 _total_capacity_bytes += capacity_bytes; |
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4648 _total_prev_live_bytes += prev_live_bytes; |
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4649 _total_next_live_bytes += next_live_bytes; |
10290
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4650 _total_remset_bytes += remset_bytes; |
12080 | 4651 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
2435
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4652 |
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4653 // Print a line for this particular region. |
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4654 _out->print_cr(G1PPRL_LINE_PREFIX |
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4655 G1PPRL_TYPE_FORMAT |
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4656 G1PPRL_ADDR_BASE_FORMAT |
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4657 G1PPRL_BYTE_FORMAT |
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4658 G1PPRL_BYTE_FORMAT |
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4659 G1PPRL_BYTE_FORMAT |
10290
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4660 G1PPRL_DOUBLE_FORMAT |
12080 | 4661 G1PPRL_BYTE_FORMAT |
10290
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4662 G1PPRL_BYTE_FORMAT, |
2435
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4663 type, bottom, end, |
12080 | 4664 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
4665 remset_bytes, strong_code_roots_bytes); | |
2435
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|
4666 |
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|
4667 return false; |
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|
4668 } |
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|
4669 |
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4670 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
10290
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4671 // add static memory usages to remembered set sizes |
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4672 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
2435
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4673 // Print the footer of the output. |
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4674 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4675 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4676 " SUMMARY" |
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|
4677 G1PPRL_SUM_MB_FORMAT("capacity") |
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4678 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4679 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
10290
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4680 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
12080 | 4681 G1PPRL_SUM_MB_FORMAT("remset") |
4682 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
2435
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4683 bytes_to_mb(_total_capacity_bytes), |
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|
4684 bytes_to_mb(_total_used_bytes), |
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|
4685 perc(_total_used_bytes, _total_capacity_bytes), |
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|
4686 bytes_to_mb(_total_prev_live_bytes), |
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|
4687 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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|
4688 bytes_to_mb(_total_next_live_bytes), |
10290
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8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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10186
diff
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|
4689 perc(_total_next_live_bytes, _total_capacity_bytes), |
12080 | 4690 bytes_to_mb(_total_remset_bytes), |
4691 bytes_to_mb(_total_strong_code_roots_bytes)); | |
2435
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|
4692 _out->cr(); |
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|
4693 } |