Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 8789:1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
Summary: If the marking stack overflows while the marking tasks are draining the SATB buffers, remark will exit with some SATB buffers left unprocessed. Relax the guarantee to allow for overflow.
Reviewed-by: jmasa, brutisso
author | johnc |
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date | Tue, 19 Mar 2013 09:38:37 -0700 |
parents | e864cc14ca75 |
children | 7b835924c31c |
rev | line source |
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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" |
1972 | 39 #include "memory/genOopClosures.inline.hpp" |
40 #include "memory/referencePolicy.hpp" | |
41 #include "memory/resourceArea.hpp" | |
42 #include "oops/oop.inline.hpp" | |
43 #include "runtime/handles.inline.hpp" | |
44 #include "runtime/java.hpp" | |
6197 | 45 #include "services/memTracker.hpp" |
342 | 46 |
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47 // Concurrent marking bit map wrapper |
342 | 48 |
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49 CMBitMapRO::CMBitMapRO(int shifter) : |
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50 _bm(), |
342 | 51 _shifter(shifter) { |
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52 _bmStartWord = 0; |
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53 _bmWordSize = 0; |
342 | 54 } |
55 | |
56 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
57 HeapWord* limit) const { | |
58 // First we must round addr *up* to a possible object boundary. | |
59 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
60 HeapWordSize << _shifter); | |
61 size_t addrOffset = heapWordToOffset(addr); | |
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62 if (limit == NULL) { |
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63 limit = _bmStartWord + _bmWordSize; |
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64 } |
342 | 65 size_t limitOffset = heapWordToOffset(limit); |
66 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
67 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
68 assert(nextAddr >= addr, "get_next_one postcondition"); | |
69 assert(nextAddr == limit || isMarked(nextAddr), | |
70 "get_next_one postcondition"); | |
71 return nextAddr; | |
72 } | |
73 | |
74 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
75 HeapWord* limit) const { | |
76 size_t addrOffset = heapWordToOffset(addr); | |
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77 if (limit == NULL) { |
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78 limit = _bmStartWord + _bmWordSize; |
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79 } |
342 | 80 size_t limitOffset = heapWordToOffset(limit); |
81 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
82 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
83 assert(nextAddr >= addr, "get_next_one postcondition"); | |
84 assert(nextAddr == limit || !isMarked(nextAddr), | |
85 "get_next_one postcondition"); | |
86 return nextAddr; | |
87 } | |
88 | |
89 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
90 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
91 return (int) (diff >> _shifter); | |
92 } | |
93 | |
94 #ifndef PRODUCT | |
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95 bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
342 | 96 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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97 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 98 "size inconsistency"); |
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99 return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
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100 _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
342 | 101 } |
102 #endif | |
103 | |
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104 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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105 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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106 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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107 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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108 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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109 if (!brs.is_reserved()) { |
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110 warning("ConcurrentMark marking bit map allocation failure"); |
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111 return false; |
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112 } |
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113 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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114 // For now we'll just commit all of the bit map up front. |
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115 // Later on we'll try to be more parsimonious with swap. |
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116 if (!_virtual_space.initialize(brs, brs.size())) { |
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117 warning("ConcurrentMark marking bit map backing store failure"); |
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118 return false; |
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119 } |
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120 assert(_virtual_space.committed_size() == brs.size(), |
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121 "didn't reserve backing store for all of concurrent marking bit map?"); |
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122 _bm.set_map((uintptr_t*)_virtual_space.low()); |
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123 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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124 _bmWordSize, "inconsistency in bit map sizing"); |
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125 _bm.set_size(_bmWordSize >> _shifter); |
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126 return true; |
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127 } |
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128 |
342 | 129 void CMBitMap::clearAll() { |
130 _bm.clear(); | |
131 return; | |
132 } | |
133 | |
134 void CMBitMap::markRange(MemRegion mr) { | |
135 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
136 assert(!mr.is_empty(), "unexpected empty region"); | |
137 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
138 ((HeapWord *) mr.end())), | |
139 "markRange memory region end is not card aligned"); | |
140 // convert address range into offset range | |
141 _bm.at_put_range(heapWordToOffset(mr.start()), | |
142 heapWordToOffset(mr.end()), true); | |
143 } | |
144 | |
145 void CMBitMap::clearRange(MemRegion mr) { | |
146 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
147 assert(!mr.is_empty(), "unexpected empty region"); | |
148 // convert address range into offset range | |
149 _bm.at_put_range(heapWordToOffset(mr.start()), | |
150 heapWordToOffset(mr.end()), false); | |
151 } | |
152 | |
153 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
154 HeapWord* end_addr) { | |
155 HeapWord* start = getNextMarkedWordAddress(addr); | |
156 start = MIN2(start, end_addr); | |
157 HeapWord* end = getNextUnmarkedWordAddress(start); | |
158 end = MIN2(end, end_addr); | |
159 assert(start <= end, "Consistency check"); | |
160 MemRegion mr(start, end); | |
161 if (!mr.is_empty()) { | |
162 clearRange(mr); | |
163 } | |
164 return mr; | |
165 } | |
166 | |
167 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
168 _base(NULL), _cm(cm) | |
169 #ifdef ASSERT | |
170 , _drain_in_progress(false) | |
171 , _drain_in_progress_yields(false) | |
172 #endif | |
173 {} | |
174 | |
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175 bool CMMarkStack::allocate(size_t capacity) { |
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176 // allocate a stack of the requisite depth |
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177 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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178 if (!rs.is_reserved()) { |
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179 warning("ConcurrentMark MarkStack allocation failure"); |
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180 return false; |
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181 } |
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182 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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183 if (!_virtual_space.initialize(rs, rs.size())) { |
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184 warning("ConcurrentMark MarkStack backing store failure"); |
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185 // Release the virtual memory reserved for the marking stack |
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186 rs.release(); |
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187 return false; |
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188 } |
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189 assert(_virtual_space.committed_size() == rs.size(), |
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190 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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191 _base = (oop*) _virtual_space.low(); |
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192 setEmpty(); |
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193 _capacity = (jint) capacity; |
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194 _saved_index = -1; |
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195 _should_expand = false; |
342 | 196 NOT_PRODUCT(_max_depth = 0); |
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197 return true; |
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198 } |
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199 |
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200 void CMMarkStack::expand() { |
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201 // Called, during remark, if we've overflown the marking stack during marking. |
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202 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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203 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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204 // Clear expansion flag |
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205 _should_expand = false; |
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206 if (_capacity == (jint) MarkStackSizeMax) { |
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207 if (PrintGCDetails && Verbose) { |
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208 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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209 } |
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210 return; |
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211 } |
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212 // Double capacity if possible |
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213 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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214 // Do not give up existing stack until we have managed to |
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215 // get the double capacity that we desired. |
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216 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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217 sizeof(oop))); |
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218 if (rs.is_reserved()) { |
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219 // Release the backing store associated with old stack |
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220 _virtual_space.release(); |
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221 // Reinitialize virtual space for new stack |
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222 if (!_virtual_space.initialize(rs, rs.size())) { |
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223 fatal("Not enough swap for expanded marking stack capacity"); |
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224 } |
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225 _base = (oop*)(_virtual_space.low()); |
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226 _index = 0; |
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227 _capacity = new_capacity; |
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228 } else { |
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229 if (PrintGCDetails && Verbose) { |
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230 // Failed to double capacity, continue; |
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231 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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232 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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233 _capacity / K, new_capacity / K); |
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234 } |
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235 } |
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236 } |
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237 |
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238 void CMMarkStack::set_should_expand() { |
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239 // If we're resetting the marking state because of an |
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240 // marking stack overflow, record that we should, if |
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241 // possible, expand the stack. |
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242 _should_expand = _cm->has_overflown(); |
342 | 243 } |
244 | |
245 CMMarkStack::~CMMarkStack() { | |
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246 if (_base != NULL) { |
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247 _base = NULL; |
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248 _virtual_space.release(); |
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249 } |
342 | 250 } |
251 | |
252 void CMMarkStack::par_push(oop ptr) { | |
253 while (true) { | |
254 if (isFull()) { | |
255 _overflow = true; | |
256 return; | |
257 } | |
258 // Otherwise... | |
259 jint index = _index; | |
260 jint next_index = index+1; | |
261 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
262 if (res == index) { | |
263 _base[index] = ptr; | |
264 // Note that we don't maintain this atomically. We could, but it | |
265 // doesn't seem necessary. | |
266 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
267 return; | |
268 } | |
269 // Otherwise, we need to try again. | |
270 } | |
271 } | |
272 | |
273 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
274 while (true) { | |
275 if (isFull()) { | |
276 _overflow = true; | |
277 return; | |
278 } | |
279 // Otherwise... | |
280 jint index = _index; | |
281 jint next_index = index + n; | |
282 if (next_index > _capacity) { | |
283 _overflow = true; | |
284 return; | |
285 } | |
286 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
287 if (res == index) { | |
288 for (int i = 0; i < n; i++) { | |
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289 int ind = index + i; |
342 | 290 assert(ind < _capacity, "By overflow test above."); |
291 _base[ind] = ptr_arr[i]; | |
292 } | |
293 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
294 return; | |
295 } | |
296 // Otherwise, we need to try again. | |
297 } | |
298 } | |
299 | |
300 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
301 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
302 jint start = _index; | |
303 jint next_index = start + n; | |
304 if (next_index > _capacity) { | |
305 _overflow = true; | |
306 return; | |
307 } | |
308 // Otherwise. | |
309 _index = next_index; | |
310 for (int i = 0; i < n; i++) { | |
311 int ind = start + i; | |
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312 assert(ind < _capacity, "By overflow test above."); |
342 | 313 _base[ind] = ptr_arr[i]; |
314 } | |
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315 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 316 } |
317 | |
318 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
319 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
320 jint index = _index; | |
321 if (index == 0) { | |
322 *n = 0; | |
323 return false; | |
324 } else { | |
325 int k = MIN2(max, index); | |
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326 jint new_ind = index - k; |
342 | 327 for (int j = 0; j < k; j++) { |
328 ptr_arr[j] = _base[new_ind + j]; | |
329 } | |
330 _index = new_ind; | |
331 *n = k; | |
332 return true; | |
333 } | |
334 } | |
335 | |
336 template<class OopClosureClass> | |
337 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
338 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
339 || SafepointSynchronize::is_at_safepoint(), | |
340 "Drain recursion must be yield-safe."); | |
341 bool res = true; | |
342 debug_only(_drain_in_progress = true); | |
343 debug_only(_drain_in_progress_yields = yield_after); | |
344 while (!isEmpty()) { | |
345 oop newOop = pop(); | |
346 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
347 assert(newOop->is_oop(), "Expected an oop"); | |
348 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
349 "only grey objects on this stack"); | |
350 newOop->oop_iterate(cl); | |
351 if (yield_after && _cm->do_yield_check()) { | |
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352 res = false; |
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353 break; |
342 | 354 } |
355 } | |
356 debug_only(_drain_in_progress = false); | |
357 return res; | |
358 } | |
359 | |
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360 void CMMarkStack::note_start_of_gc() { |
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361 assert(_saved_index == -1, |
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362 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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363 _saved_index = _index; |
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364 } |
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365 |
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366 void CMMarkStack::note_end_of_gc() { |
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367 // This is intentionally a guarantee, instead of an assert. If we |
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368 // accidentally add something to the mark stack during GC, it |
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369 // will be a correctness issue so it's better if we crash. we'll |
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370 // only check this once per GC anyway, so it won't be a performance |
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371 // issue in any way. |
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372 guarantee(_saved_index == _index, |
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373 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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374 _saved_index = -1; |
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375 } |
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376 |
342 | 377 void CMMarkStack::oops_do(OopClosure* f) { |
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378 assert(_saved_index == _index, |
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379 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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380 for (int i = 0; i < _index; i += 1) { |
342 | 381 f->do_oop(&_base[i]); |
382 } | |
383 } | |
384 | |
385 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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386 return _g1h->is_obj_ill(obj); |
342 | 387 } |
388 | |
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389 CMRootRegions::CMRootRegions() : |
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390 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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391 _should_abort(false), _next_survivor(NULL) { } |
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392 |
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393 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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394 _young_list = g1h->young_list(); |
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395 _cm = cm; |
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396 } |
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397 |
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398 void CMRootRegions::prepare_for_scan() { |
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399 assert(!scan_in_progress(), "pre-condition"); |
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400 |
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401 // Currently, only survivors can be root regions. |
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402 assert(_next_survivor == NULL, "pre-condition"); |
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403 _next_survivor = _young_list->first_survivor_region(); |
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404 _scan_in_progress = (_next_survivor != NULL); |
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405 _should_abort = false; |
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406 } |
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407 |
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408 HeapRegion* CMRootRegions::claim_next() { |
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409 if (_should_abort) { |
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410 // If someone has set the should_abort flag, we return NULL to |
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411 // force the caller to bail out of their loop. |
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412 return NULL; |
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413 } |
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414 |
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415 // Currently, only survivors can be root regions. |
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416 HeapRegion* res = _next_survivor; |
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417 if (res != NULL) { |
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418 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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419 // Read it again in case it changed while we were waiting for the lock. |
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420 res = _next_survivor; |
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421 if (res != NULL) { |
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422 if (res == _young_list->last_survivor_region()) { |
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423 // We just claimed the last survivor so store NULL to indicate |
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424 // that we're done. |
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425 _next_survivor = NULL; |
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426 } else { |
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427 _next_survivor = res->get_next_young_region(); |
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428 } |
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429 } else { |
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430 // Someone else claimed the last survivor while we were trying |
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431 // to take the lock so nothing else to do. |
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432 } |
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433 } |
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434 assert(res == NULL || res->is_survivor(), "post-condition"); |
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435 |
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436 return res; |
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437 } |
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438 |
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439 void CMRootRegions::scan_finished() { |
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440 assert(scan_in_progress(), "pre-condition"); |
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441 |
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442 // Currently, only survivors can be root regions. |
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443 if (!_should_abort) { |
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444 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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445 } |
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446 _next_survivor = NULL; |
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447 |
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448 { |
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449 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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450 _scan_in_progress = false; |
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451 RootRegionScan_lock->notify_all(); |
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452 } |
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453 } |
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454 |
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455 bool CMRootRegions::wait_until_scan_finished() { |
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456 if (!scan_in_progress()) return false; |
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457 |
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458 { |
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459 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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460 while (scan_in_progress()) { |
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461 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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462 } |
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463 } |
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464 return true; |
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465 } |
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466 |
342 | 467 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
468 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
469 #endif // _MSC_VER | |
470 | |
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471 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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472 return MAX2((n_par_threads + 2) / 4, 1U); |
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473 } |
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474 |
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475 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
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476 _g1h(g1h), |
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477 _markBitMap1(MinObjAlignment - 1), |
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478 _markBitMap2(MinObjAlignment - 1), |
342 | 479 |
480 _parallel_marking_threads(0), | |
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481 _max_parallel_marking_threads(0), |
342 | 482 _sleep_factor(0.0), |
483 _marking_task_overhead(1.0), | |
484 _cleanup_sleep_factor(0.0), | |
485 _cleanup_task_overhead(1.0), | |
2152 | 486 _cleanup_list("Cleanup List"), |
7397
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487 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
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488 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
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489 CardTableModRefBS::card_shift, |
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490 false /* in_resource_area*/), |
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491 |
342 | 492 _prevMarkBitMap(&_markBitMap1), |
493 _nextMarkBitMap(&_markBitMap2), | |
494 | |
495 _markStack(this), | |
496 // _finger set in set_non_marking_state | |
497 | |
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498 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 499 // _active_tasks set in set_non_marking_state |
500 // _tasks set inside the constructor | |
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501 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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502 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 503 |
504 _has_overflown(false), | |
505 _concurrent(false), | |
619
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506 _has_aborted(false), |
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507 _restart_for_overflow(false), |
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508 _concurrent_marking_in_progress(false), |
342 | 509 |
510 // _verbose_level set below | |
511 | |
512 _init_times(), | |
513 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
514 _cleanup_times(), | |
515 _total_counting_time(0.0), | |
516 _total_rs_scrub_time(0.0), | |
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517 |
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518 _parallel_workers(NULL), |
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519 |
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520 _count_card_bitmaps(NULL), |
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521 _count_marked_bytes(NULL), |
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522 _completed_initialization(false) { |
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523 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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524 if (verbose_level < no_verbose) { |
342 | 525 verbose_level = no_verbose; |
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526 } |
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527 if (verbose_level > high_verbose) { |
342 | 528 verbose_level = high_verbose; |
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529 } |
342 | 530 _verbose_level = verbose_level; |
531 | |
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532 if (verbose_low()) { |
342 | 533 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
534 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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535 } |
342 | 536 |
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537 if (!_markBitMap1.allocate(heap_rs)) { |
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538 warning("Failed to allocate first CM bit map"); |
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539 return; |
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540 } |
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541 if (!_markBitMap2.allocate(heap_rs)) { |
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542 warning("Failed to allocate second CM bit map"); |
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543 return; |
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544 } |
342 | 545 |
546 // Create & start a ConcurrentMark thread. | |
845
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547 _cmThread = new ConcurrentMarkThread(this); |
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548 assert(cmThread() != NULL, "CM Thread should have been created"); |
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549 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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550 |
342 | 551 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
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552 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
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553 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 554 |
555 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 556 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 557 |
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558 _root_regions.init(_g1h, this); |
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559 |
1284 | 560 if (ConcGCThreads > ParallelGCThreads) { |
7397
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561 warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") " |
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562 "than ParallelGCThreads (" UINT32_FORMAT ").", |
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563 ConcGCThreads, ParallelGCThreads); |
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564 return; |
342 | 565 } |
566 if (ParallelGCThreads == 0) { | |
567 // if we are not running with any parallel GC threads we will not | |
568 // spawn any marking threads either | |
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569 _parallel_marking_threads = 0; |
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570 _max_parallel_marking_threads = 0; |
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571 _sleep_factor = 0.0; |
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572 _marking_task_overhead = 1.0; |
342 | 573 } else { |
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574 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
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575 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 576 // if both are set |
577 _sleep_factor = 0.0; | |
578 _marking_task_overhead = 1.0; | |
751 | 579 } else if (G1MarkingOverheadPercent > 0) { |
8006
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580 // We will calculate the number of parallel marking threads based |
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581 // on a target overhead with respect to the soft real-time goal |
751 | 582 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 583 double overall_cm_overhead = |
751 | 584 (double) MaxGCPauseMillis * marking_overhead / |
585 (double) GCPauseIntervalMillis; | |
342 | 586 double cpu_ratio = 1.0 / (double) os::processor_count(); |
587 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
588 double marking_task_overhead = | |
589 overall_cm_overhead / marking_thread_num * | |
590 (double) os::processor_count(); | |
591 double sleep_factor = | |
592 (1.0 - marking_task_overhead) / marking_task_overhead; | |
593 | |
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594 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 595 _sleep_factor = sleep_factor; |
596 _marking_task_overhead = marking_task_overhead; | |
597 } else { | |
8006
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598 // Calculate the number of parallel marking threads by scaling |
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599 // the number of parallel GC threads. |
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600 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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601 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 602 _sleep_factor = 0.0; |
603 _marking_task_overhead = 1.0; | |
604 } | |
605 | |
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606 assert(ConcGCThreads > 0, "Should have been set"); |
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607 _parallel_marking_threads = (uint) ConcGCThreads; |
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608 _max_parallel_marking_threads = _parallel_marking_threads; |
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609 |
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610 if (parallel_marking_threads() > 1) { |
342 | 611 _cleanup_task_overhead = 1.0; |
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612 } else { |
342 | 613 _cleanup_task_overhead = marking_task_overhead(); |
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614 } |
342 | 615 _cleanup_sleep_factor = |
616 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
617 | |
618 #if 0 | |
619 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
620 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
621 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
622 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
623 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
624 #endif | |
625 | |
1023
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626 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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627 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
4728
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628 _max_parallel_marking_threads, false, true); |
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629 if (_parallel_workers == NULL) { |
342 | 630 vm_exit_during_initialization("Failed necessary allocation."); |
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631 } else { |
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632 _parallel_workers->initialize_workers(); |
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633 } |
342 | 634 } |
635 | |
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636 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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637 uintx mark_stack_size = |
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638 MIN2(MarkStackSizeMax, |
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639 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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640 // Verify that the calculated value for MarkStackSize is in range. |
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641 // It would be nice to use the private utility routine from Arguments. |
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642 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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643 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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644 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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645 mark_stack_size, 1, MarkStackSizeMax); |
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646 return; |
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647 } |
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648 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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649 } else { |
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650 // Verify MarkStackSize is in range. |
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651 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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652 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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653 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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654 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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655 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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656 MarkStackSize, 1, MarkStackSizeMax); |
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657 return; |
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658 } |
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659 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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660 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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661 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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662 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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663 MarkStackSize, MarkStackSizeMax); |
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664 return; |
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665 } |
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666 } |
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667 } |
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668 } |
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669 |
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670 if (!_markStack.allocate(MarkStackSize)) { |
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671 warning("Failed to allocate CM marking stack"); |
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672 return; |
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673 } |
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674 |
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675 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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676 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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677 |
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678 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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679 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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680 |
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681 BitMap::idx_t card_bm_size = _card_bm.size(); |
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682 |
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683 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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684 _active_tasks = _max_worker_id; |
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685 |
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686 size_t max_regions = (size_t) _g1h->max_regions(); |
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687 for (uint i = 0; i < _max_worker_id; ++i) { |
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688 CMTaskQueue* task_queue = new CMTaskQueue(); |
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689 task_queue->initialize(); |
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690 _task_queues->register_queue(i, task_queue); |
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691 |
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692 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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693 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
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694 |
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695 _tasks[i] = new CMTask(i, this, |
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696 _count_marked_bytes[i], |
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697 &_count_card_bitmaps[i], |
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698 task_queue, _task_queues); |
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699 |
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700 _accum_task_vtime[i] = 0.0; |
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701 } |
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702 |
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703 // Calculate the card number for the bottom of the heap. Used |
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704 // in biasing indexes into the accounting card bitmaps. |
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705 _heap_bottom_card_num = |
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706 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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707 CardTableModRefBS::card_shift); |
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708 |
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709 // Clear all the liveness counting data |
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710 clear_all_count_data(); |
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711 |
342 | 712 // so that the call below can read a sensible value |
7397
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713 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 714 set_non_marking_state(); |
7397
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715 _completed_initialization = true; |
342 | 716 } |
717 | |
718 void ConcurrentMark::update_g1_committed(bool force) { | |
719 // If concurrent marking is not in progress, then we do not need to | |
5988
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7127697: G1: remove dead code after recent concurrent mark changes
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720 // update _heap_end. |
3776
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721 if (!concurrent_marking_in_progress() && !force) return; |
342 | 722 |
723 MemRegion committed = _g1h->g1_committed(); | |
1023
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724 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 725 HeapWord* new_end = committed.end(); |
726 if (new_end > _heap_end) { | |
727 // The heap has been expanded. | |
728 | |
729 _heap_end = new_end; | |
730 } | |
731 // Notice that the heap can also shrink. However, this only happens | |
732 // during a Full GC (at least currently) and the entire marking | |
733 // phase will bail out and the task will not be restarted. So, let's | |
734 // do nothing. | |
735 } | |
736 | |
737 void ConcurrentMark::reset() { | |
738 // Starting values for these two. This should be called in a STW | |
739 // phase. CM will be notified of any future g1_committed expansions | |
740 // will be at the end of evacuation pauses, when tasks are | |
741 // inactive. | |
742 MemRegion committed = _g1h->g1_committed(); | |
743 _heap_start = committed.start(); | |
744 _heap_end = committed.end(); | |
745 | |
1023
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746 // Separated the asserts so that we know which one fires. |
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747 assert(_heap_start != NULL, "heap bounds should look ok"); |
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748 assert(_heap_end != NULL, "heap bounds should look ok"); |
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749 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 750 |
7450
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751 // Reset all the marking data structures and any necessary flags |
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752 reset_marking_state(); |
342 | 753 |
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754 if (verbose_low()) { |
342 | 755 gclog_or_tty->print_cr("[global] resetting"); |
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756 } |
342 | 757 |
758 // We do reset all of them, since different phases will use | |
759 // different number of active threads. So, it's easiest to have all | |
760 // of them ready. | |
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761 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 762 _tasks[i]->reset(_nextMarkBitMap); |
1835
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763 } |
342 | 764 |
765 // we need this to make sure that the flag is on during the evac | |
766 // pause with initial mark piggy-backed | |
767 set_concurrent_marking_in_progress(); | |
768 } | |
769 | |
7450
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770 |
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771 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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772 _markStack.set_should_expand(); |
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773 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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774 if (clear_overflow) { |
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775 clear_has_overflown(); |
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776 } else { |
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777 assert(has_overflown(), "pre-condition"); |
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778 } |
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779 _finger = _heap_start; |
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780 |
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781 for (uint i = 0; i < _max_worker_id; ++i) { |
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782 CMTaskQueue* queue = _task_queues->queue(i); |
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783 queue->set_empty(); |
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784 } |
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785 } |
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786 |
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787 void ConcurrentMark::set_concurrency(uint active_tasks) { |
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788 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 789 |
790 _active_tasks = active_tasks; | |
791 // Need to update the three data structures below according to the | |
792 // number of active threads for this phase. | |
793 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
794 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
795 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
8788
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796 } |
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797 |
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798 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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799 set_concurrency(active_tasks); |
342 | 800 |
801 _concurrent = concurrent; | |
802 // We propagate this to all tasks, not just the active ones. | |
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803 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 804 _tasks[i]->set_concurrent(concurrent); |
805 | |
806 if (concurrent) { | |
807 set_concurrent_marking_in_progress(); | |
808 } else { | |
809 // We currently assume that the concurrent flag has been set to | |
810 // false before we start remark. At this point we should also be | |
811 // in a STW phase. | |
1023
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812 assert(!concurrent_marking_in_progress(), "invariant"); |
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813 assert(_finger == _heap_end, |
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814 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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815 _finger, _heap_end)); |
342 | 816 update_g1_committed(true); |
817 } | |
818 } | |
819 | |
820 void ConcurrentMark::set_non_marking_state() { | |
821 // We set the global marking state to some default values when we're | |
822 // not doing marking. | |
7450
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823 reset_marking_state(); |
342 | 824 _active_tasks = 0; |
825 clear_concurrent_marking_in_progress(); | |
826 } | |
827 | |
828 ConcurrentMark::~ConcurrentMark() { | |
4735 | 829 // The ConcurrentMark instance is never freed. |
830 ShouldNotReachHere(); | |
342 | 831 } |
832 | |
833 void ConcurrentMark::clearNextBitmap() { | |
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834 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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835 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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836 |
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837 // Make sure that the concurrent mark thread looks to still be in |
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838 // the current cycle. |
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839 guarantee(cmThread()->during_cycle(), "invariant"); |
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840 |
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841 // We are finishing up the current cycle by clearing the next |
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842 // marking bitmap and getting it ready for the next cycle. During |
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843 // this time no other cycle can start. So, let's make sure that this |
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844 // is the case. |
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845 guarantee(!g1h->mark_in_progress(), "invariant"); |
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846 |
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847 // clear the mark bitmap (no grey objects to start with). |
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848 // We need to do this in chunks and offer to yield in between |
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849 // each chunk. |
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850 HeapWord* start = _nextMarkBitMap->startWord(); |
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851 HeapWord* end = _nextMarkBitMap->endWord(); |
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852 HeapWord* cur = start; |
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853 size_t chunkSize = M; |
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854 while (cur < end) { |
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855 HeapWord* next = cur + chunkSize; |
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856 if (next > end) { |
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857 next = end; |
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858 } |
1359
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859 MemRegion mr(cur,next); |
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860 _nextMarkBitMap->clearRange(mr); |
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861 cur = next; |
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862 do_yield_check(); |
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863 |
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864 // Repeat the asserts from above. We'll do them as asserts here to |
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865 // minimize their overhead on the product. However, we'll have |
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866 // them as guarantees at the beginning / end of the bitmap |
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867 // clearing to get some checking in the product. |
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868 assert(cmThread()->during_cycle(), "invariant"); |
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869 assert(!g1h->mark_in_progress(), "invariant"); |
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870 } |
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871 |
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872 // Clear the liveness counting data |
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873 clear_all_count_data(); |
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874 |
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875 // Repeat the asserts from above. |
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876 guarantee(cmThread()->during_cycle(), "invariant"); |
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877 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 878 } |
879 | |
880 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
881 public: | |
882 bool doHeapRegion(HeapRegion* r) { | |
883 if (!r->continuesHumongous()) { | |
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884 r->note_start_of_marking(); |
342 | 885 } |
886 return false; | |
887 } | |
888 }; | |
889 | |
890 void ConcurrentMark::checkpointRootsInitialPre() { | |
891 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
892 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
893 | |
894 _has_aborted = false; | |
895 | |
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896 #ifndef PRODUCT |
1044 | 897 if (G1PrintReachableAtInitialMark) { |
1388 | 898 print_reachable("at-cycle-start", |
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899 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 900 } |
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901 #endif |
342 | 902 |
903 // Initialise marking structures. This has to be done in a STW phase. | |
904 reset(); | |
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905 |
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906 // For each region note start of marking. |
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907 NoteStartOfMarkHRClosure startcl; |
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908 g1h->heap_region_iterate(&startcl); |
342 | 909 } |
910 | |
911 | |
912 void ConcurrentMark::checkpointRootsInitialPost() { | |
913 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
914 | |
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915 // If we force an overflow during remark, the remark operation will |
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916 // actually abort and we'll restart concurrent marking. If we always |
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917 // force an oveflow during remark we'll never actually complete the |
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918 // marking phase. So, we initilize this here, at the start of the |
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919 // cycle, so that at the remaining overflow number will decrease at |
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920 // every remark and we'll eventually not need to cause one. |
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921 force_overflow_stw()->init(); |
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922 |
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923 // Start Concurrent Marking weak-reference discovery. |
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924 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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925 // enable ("weak") refs discovery |
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926 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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927 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 928 |
929 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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930 // This is the start of the marking cycle, we're expected all |
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931 // threads to have SATB queues with active set to false. |
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932 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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933 false /* expected_active */); |
342 | 934 |
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935 _root_regions.prepare_for_scan(); |
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936 |
342 | 937 // update_g1_committed() will be called at the end of an evac pause |
938 // when marking is on. So, it's also called at the end of the | |
939 // initial-mark pause to update the heap end, if the heap expands | |
940 // during it. No need to call it here. | |
941 } | |
942 | |
943 /* | |
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944 * Notice that in the next two methods, we actually leave the STS |
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945 * during the barrier sync and join it immediately afterwards. If we |
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946 * do not do this, the following deadlock can occur: one thread could |
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947 * be in the barrier sync code, waiting for the other thread to also |
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948 * sync up, whereas another one could be trying to yield, while also |
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949 * waiting for the other threads to sync up too. |
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950 * |
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951 * Note, however, that this code is also used during remark and in |
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952 * this case we should not attempt to leave / enter the STS, otherwise |
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953 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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954 * (product). So we should only leave / enter the STS if we are |
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955 * operating concurrently. |
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956 * |
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957 * Because the thread that does the sync barrier has left the STS, it |
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958 * is possible to be suspended for a Full GC or an evacuation pause |
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959 * could occur. This is actually safe, since the entering the sync |
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960 * barrier is one of the last things do_marking_step() does, and it |
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961 * doesn't manipulate any data structures afterwards. |
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962 */ |
342 | 963 |
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964 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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965 if (verbose_low()) { |
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966 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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967 } |
342 | 968 |
3316
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969 if (concurrent()) { |
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970 ConcurrentGCThread::stsLeave(); |
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971 } |
342 | 972 _first_overflow_barrier_sync.enter(); |
3316
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973 if (concurrent()) { |
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974 ConcurrentGCThread::stsJoin(); |
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975 } |
342 | 976 // at this point everyone should have synced up and not be doing any |
977 // more work | |
978 | |
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979 if (verbose_low()) { |
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980 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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981 } |
342 | 982 |
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983 // If we're executing the concurrent phase of marking, reset the marking |
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984 // state; otherwise the marking state is reset after reference processing, |
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985 // during the remark pause. |
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986 // If we reset here as a result of an overflow during the remark we will |
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987 // see assertion failures from any subsequent set_concurrency_and_phase() |
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988 // calls. |
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989 if (concurrent()) { |
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990 // let the task associated with with worker 0 do this |
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991 if (worker_id == 0) { |
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992 // task 0 is responsible for clearing the global data structures |
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993 // We should be here because of an overflow. During STW we should |
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994 // not clear the overflow flag since we rely on it being true when |
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995 // we exit this method to abort the pause and restart concurent |
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996 // marking. |
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997 reset_marking_state(true /* clear_overflow */); |
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998 force_overflow()->update(); |
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999 |
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1000 if (G1Log::fine()) { |
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1001 gclog_or_tty->date_stamp(PrintGCDateStamps); |
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1002 gclog_or_tty->stamp(PrintGCTimeStamps); |
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1003 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1004 } |
342 | 1005 } |
1006 } | |
1007 | |
1008 // after this, each task should reset its own data structures then | |
1009 // then go into the second barrier | |
1010 } | |
1011 | |
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1012 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1013 if (verbose_low()) { |
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1014 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1015 } |
342 | 1016 |
3316
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1017 if (concurrent()) { |
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1018 ConcurrentGCThread::stsLeave(); |
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1019 } |
342 | 1020 _second_overflow_barrier_sync.enter(); |
3316
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1021 if (concurrent()) { |
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1022 ConcurrentGCThread::stsJoin(); |
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1023 } |
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1024 // at this point everything should be re-initialized and ready to go |
342 | 1025 |
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1026 if (verbose_low()) { |
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1027 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1028 } |
342 | 1029 } |
1030 | |
3316
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1031 #ifndef PRODUCT |
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1032 void ForceOverflowSettings::init() { |
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1033 _num_remaining = G1ConcMarkForceOverflow; |
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1034 _force = false; |
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1035 update(); |
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1036 } |
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1037 |
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1038 void ForceOverflowSettings::update() { |
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1039 if (_num_remaining > 0) { |
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1040 _num_remaining -= 1; |
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1041 _force = true; |
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1042 } else { |
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1043 _force = false; |
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1044 } |
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1045 } |
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1046 |
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1047 bool ForceOverflowSettings::should_force() { |
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1048 if (_force) { |
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1049 _force = false; |
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1050 return true; |
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1051 } else { |
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1052 return false; |
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1053 } |
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1054 } |
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1055 #endif // !PRODUCT |
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1056 |
342 | 1057 class CMConcurrentMarkingTask: public AbstractGangTask { |
1058 private: | |
1059 ConcurrentMark* _cm; | |
1060 ConcurrentMarkThread* _cmt; | |
1061 | |
1062 public: | |
4728
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1063 void work(uint worker_id) { |
1023
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1064 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1065 "this should only be done by a conc GC thread"); |
1974
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1066 ResourceMark rm; |
342 | 1067 |
1068 double start_vtime = os::elapsedVTime(); | |
1069 | |
1070 ConcurrentGCThread::stsJoin(); | |
1071 | |
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1072 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1073 CMTask* the_task = _cm->task(worker_id); |
342 | 1074 the_task->record_start_time(); |
1075 if (!_cm->has_aborted()) { | |
1076 do { | |
1077 double start_vtime_sec = os::elapsedVTime(); | |
1078 double start_time_sec = os::elapsedTime(); | |
2174
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1079 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1080 |
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1081 the_task->do_marking_step(mark_step_duration_ms, |
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1082 true /* do_termination */, |
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1083 false /* is_serial*/); |
2174
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1084 |
342 | 1085 double end_time_sec = os::elapsedTime(); |
1086 double end_vtime_sec = os::elapsedVTime(); | |
1087 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1088 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1089 _cm->clear_has_overflown(); | |
1090 | |
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1091 bool ret = _cm->do_yield_check(worker_id); |
342 | 1092 |
1093 jlong sleep_time_ms; | |
1094 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1095 sleep_time_ms = | |
1096 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1097 ConcurrentGCThread::stsLeave(); | |
1098 os::sleep(Thread::current(), sleep_time_ms, false); | |
1099 ConcurrentGCThread::stsJoin(); | |
1100 } | |
1101 double end_time2_sec = os::elapsedTime(); | |
1102 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1103 | |
1104 #if 0 | |
1105 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1106 "overhead %1.4lf", | |
1107 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1108 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1109 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1110 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1111 #endif | |
1112 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1113 } | |
1114 the_task->record_end_time(); | |
1023
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1115 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1116 |
1117 ConcurrentGCThread::stsLeave(); | |
1118 | |
1119 double end_vtime = os::elapsedVTime(); | |
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1120 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1121 } |
1122 | |
1123 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1124 ConcurrentMarkThread* cmt) : | |
1125 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1126 | |
1127 ~CMConcurrentMarkingTask() { } | |
1128 }; | |
1129 | |
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1130 // Calculates the number of active workers for a concurrent |
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1131 // phase. |
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1132 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1133 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1134 uint n_conc_workers = 0; |
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1135 if (!UseDynamicNumberOfGCThreads || |
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1136 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1137 !ForceDynamicNumberOfGCThreads)) { |
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1138 n_conc_workers = max_parallel_marking_threads(); |
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1139 } else { |
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1140 n_conc_workers = |
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1141 AdaptiveSizePolicy::calc_default_active_workers( |
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1142 max_parallel_marking_threads(), |
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1143 1, /* Minimum workers */ |
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1144 parallel_marking_threads(), |
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1145 Threads::number_of_non_daemon_threads()); |
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1146 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1147 // that scaling has already gone into "_max_parallel_marking_threads". |
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1148 } |
4711 | 1149 assert(n_conc_workers > 0, "Always need at least 1"); |
1150 return n_conc_workers; | |
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1151 } |
4711 | 1152 // If we are not running with any parallel GC threads we will not |
1153 // have spawned any marking threads either. Hence the number of | |
1154 // concurrent workers should be 0. | |
1155 return 0; | |
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1156 } |
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1157 |
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1158 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1159 // Currently, only survivors can be root regions. |
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1160 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1161 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1162 |
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1163 const uintx interval = PrefetchScanIntervalInBytes; |
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1164 HeapWord* curr = hr->bottom(); |
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1165 const HeapWord* end = hr->top(); |
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1166 while (curr < end) { |
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1167 Prefetch::read(curr, interval); |
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1168 oop obj = oop(curr); |
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1169 int size = obj->oop_iterate(&cl); |
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1170 assert(size == obj->size(), "sanity"); |
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1171 curr += size; |
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1172 } |
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1173 } |
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1174 |
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1175 class CMRootRegionScanTask : public AbstractGangTask { |
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1176 private: |
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1177 ConcurrentMark* _cm; |
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1178 |
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1179 public: |
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1180 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1181 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1182 |
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1183 void work(uint worker_id) { |
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1184 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1185 "this should only be done by a conc GC thread"); |
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1186 |
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1187 CMRootRegions* root_regions = _cm->root_regions(); |
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1188 HeapRegion* hr = root_regions->claim_next(); |
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1189 while (hr != NULL) { |
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1190 _cm->scanRootRegion(hr, worker_id); |
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1191 hr = root_regions->claim_next(); |
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1192 } |
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1193 } |
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1194 }; |
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1195 |
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1196 void ConcurrentMark::scanRootRegions() { |
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1197 // scan_in_progress() will have been set to true only if there was |
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1198 // at least one root region to scan. So, if it's false, we |
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1199 // should not attempt to do any further work. |
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1200 if (root_regions()->scan_in_progress()) { |
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1201 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1202 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1203 "Maximum number of marking threads exceeded"); |
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1204 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1205 |
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1206 CMRootRegionScanTask task(this); |
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1207 if (use_parallel_marking_threads()) { |
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1208 _parallel_workers->set_active_workers((int) active_workers); |
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1209 _parallel_workers->run_task(&task); |
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1210 } else { |
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1211 task.work(0); |
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1212 } |
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1213 |
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1214 // It's possible that has_aborted() is true here without actually |
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1215 // aborting the survivor scan earlier. This is OK as it's |
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1216 // mainly used for sanity checking. |
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1217 root_regions()->scan_finished(); |
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1218 } |
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1219 } |
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1220 |
342 | 1221 void ConcurrentMark::markFromRoots() { |
1222 // we might be tempted to assert that: | |
1223 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1224 // "inconsistent argument?"); | |
1225 // However that wouldn't be right, because it's possible that | |
1226 // a safepoint is indeed in progress as a younger generation | |
1227 // stop-the-world GC happens even as we mark in this generation. | |
1228 | |
1229 _restart_for_overflow = false; | |
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1230 force_overflow_conc()->init(); |
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1231 |
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1232 // _g1h has _n_par_threads |
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1233 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1234 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1235 "Maximum number of marking threads exceeded"); |
4711 | 1236 |
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1237 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1238 |
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1239 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1240 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1241 |
1242 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1243 if (use_parallel_marking_threads()) { |
4711 | 1244 _parallel_workers->set_active_workers((int)active_workers); |
1245 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1246 // and the decisions on that MT processing is made elsewhere. | |
1247 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1248 _parallel_workers->run_task(&markingTask); |
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1249 } else { |
342 | 1250 markingTask.work(0); |
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1251 } |
342 | 1252 print_stats(); |
1253 } | |
1254 | |
1255 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1256 // world is stopped at this checkpoint | |
1257 assert(SafepointSynchronize::is_at_safepoint(), | |
1258 "world should be stopped"); | |
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1259 |
342 | 1260 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1261 | |
1262 // If a full collection has happened, we shouldn't do this. | |
1263 if (has_aborted()) { | |
1264 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1265 return; | |
1266 } | |
1267 | |
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1268 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1269 |
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1270 if (VerifyDuringGC) { |
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1271 HandleMark hm; // handle scope |
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1272 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1273 Universe::heap()->prepare_for_verify(); |
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1274 Universe::verify(/* silent */ false, |
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1275 /* option */ VerifyOption_G1UsePrevMarking); |
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1276 } |
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1277 |
342 | 1278 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1279 g1p->record_concurrent_mark_remark_start(); | |
1280 | |
1281 double start = os::elapsedTime(); | |
1282 | |
1283 checkpointRootsFinalWork(); | |
1284 | |
1285 double mark_work_end = os::elapsedTime(); | |
1286 | |
1287 weakRefsWork(clear_all_soft_refs); | |
1288 | |
1289 if (has_overflown()) { | |
1290 // Oops. We overflowed. Restart concurrent marking. | |
1291 _restart_for_overflow = true; | |
8789
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1292 if (G1TraceMarkStackOverflow) { |
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1293 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1294 } |
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1295 |
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1296 // Verify the heap w.r.t. the previous marking bitmap. |
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1297 if (VerifyDuringGC) { |
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1298 HandleMark hm; // handle scope |
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1299 gclog_or_tty->print(" VerifyDuringGC:(overflow)"); |
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1300 Universe::heap()->prepare_for_verify(); |
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1301 Universe::verify(/* silent */ false, |
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1302 /* option */ VerifyOption_G1UsePrevMarking); |
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1303 } |
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1304 |
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1305 // Clear the marking state because we will be restarting |
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1306 // marking due to overflowing the global mark stack. |
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1307 reset_marking_state(); |
342 | 1308 } else { |
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1309 // Aggregate the per-task counting data that we have accumulated |
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1310 // while marking. |
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1311 aggregate_count_data(); |
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1312 |
2149 | 1313 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1314 // We're done with marking. |
1317
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1315 // This is the end of the marking cycle, we're expected all |
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1316 // threads to have SATB queues with active set to true. |
2149 | 1317 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1318 true /* expected_active */); | |
811 | 1319 |
1320 if (VerifyDuringGC) { | |
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1321 HandleMark hm; // handle scope |
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1322 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1323 Universe::heap()->prepare_for_verify(); |
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1324 Universe::verify(/* silent */ false, |
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1325 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1326 } |
2174
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1327 assert(!restart_for_overflow(), "sanity"); |
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1328 // Completely reset the marking state since marking completed |
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1329 set_non_marking_state(); |
2174
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1330 } |
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1331 |
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1332 // Expand the marking stack, if we have to and if we can. |
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1333 if (_markStack.should_expand()) { |
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1334 _markStack.expand(); |
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1335 } |
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1336 |
342 | 1337 // Statistics |
1338 double now = os::elapsedTime(); | |
1339 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1340 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1341 _remark_times.add((now - start) * 1000.0); | |
1342 | |
1343 g1p->record_concurrent_mark_remark_end(); | |
1344 } | |
1345 | |
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1346 // Base class of the closures that finalize and verify the |
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1347 // liveness counting data. |
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1348 class CMCountDataClosureBase: public HeapRegionClosure { |
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1349 protected: |
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1350 G1CollectedHeap* _g1h; |
342 | 1351 ConcurrentMark* _cm; |
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1352 CardTableModRefBS* _ct_bs; |
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1353 |
342 | 1354 BitMap* _region_bm; |
1355 BitMap* _card_bm; | |
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1356 |
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1357 // Takes a region that's not empty (i.e., it has at least one |
829 | 1358 // live object in it and sets its corresponding bit on the region |
1359 // bitmap to 1. If the region is "starts humongous" it will also set | |
1360 // to 1 the bits on the region bitmap that correspond to its | |
1361 // associated "continues humongous" regions. | |
1362 void set_bit_for_region(HeapRegion* hr) { | |
1363 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1364 | |
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1365 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1366 if (!hr->startsHumongous()) { |
1367 // Normal (non-humongous) case: just set the bit. | |
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1368 _region_bm->par_at_put(index, true); |
829 | 1369 } else { |
1370 // Starts humongous case: calculate how many regions are part of | |
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1371 // this humongous region and then set the bit range. |
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1372 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1373 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1374 } |
1375 } | |
1376 | |
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1377 public: |
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1378 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1379 BitMap* region_bm, BitMap* card_bm): |
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1380 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1381 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1382 _region_bm(region_bm), _card_bm(card_bm) { } |
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1383 }; |
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1384 |
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1385 // Closure that calculates the # live objects per region. Used |
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1386 // for verification purposes during the cleanup pause. |
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1387 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1388 CMBitMapRO* _bm; |
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1389 size_t _region_marked_bytes; |
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1390 |
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1391 public: |
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1392 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1393 BitMap* region_bm, BitMap* card_bm) : |
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1394 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1395 _bm(bm), _region_marked_bytes(0) { } |
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1396 |
342 | 1397 bool doHeapRegion(HeapRegion* hr) { |
1398 | |
639 | 1399 if (hr->continuesHumongous()) { |
829 | 1400 // We will ignore these here and process them when their |
1401 // associated "starts humongous" region is processed (see | |
1402 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1403 // associated "starts humongous" region to have their bit set to | |
1404 // 1 since, due to the region chunking in the parallel region | |
1405 // iteration, a "continues humongous" region might be visited | |
1406 // before its associated "starts humongous". | |
639 | 1407 return false; |
1408 } | |
342 | 1409 |
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1410 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1411 HeapWord* start = hr->bottom(); |
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1412 |
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1413 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1414 err_msg("Preconditions not met - " |
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1415 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1416 start, ntams, hr->end())); |
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1417 |
342 | 1418 // Find the first marked object at or after "start". |
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1419 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1420 |
342 | 1421 size_t marked_bytes = 0; |
1422 | |
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1423 while (start < ntams) { |
342 | 1424 oop obj = oop(start); |
1425 int obj_sz = obj->size(); | |
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1426 HeapWord* obj_end = start + obj_sz; |
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1427 |
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1428 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1429 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1430 |
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1431 // Note: if we're looking at the last region in heap - obj_end |
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1432 // could be actually just beyond the end of the heap; end_idx |
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1433 // will then correspond to a (non-existent) card that is also |
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1434 // just beyond the heap. |
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1435 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1436 // end of object is not card aligned - increment to cover |
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1437 // all the cards spanned by the object |
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1438 end_idx += 1; |
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1439 } |
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1440 |
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1441 // Set the bits in the card BM for the cards spanned by this object. |
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1442 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1443 |
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1444 // Add the size of this object to the number of marked bytes. |
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1445 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1446 |
342 | 1447 // Find the next marked object after this one. |
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1448 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1449 } |
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1450 |
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1451 // Mark the allocated-since-marking portion... |
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1452 HeapWord* top = hr->top(); |
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1453 if (ntams < top) { |
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1454 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1455 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1456 |
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1457 // Note: if we're looking at the last region in heap - top |
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1458 // could be actually just beyond the end of the heap; end_idx |
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1459 // will then correspond to a (non-existent) card that is also |
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1460 // just beyond the heap. |
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1461 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1462 // end of object is not card aligned - increment to cover |
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1463 // all the cards spanned by the object |
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1464 end_idx += 1; |
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1465 } |
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1466 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1467 |
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1468 // This definitely means the region has live objects. |
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1469 set_bit_for_region(hr); |
342 | 1470 } |
1471 | |
1472 // Update the live region bitmap. | |
1473 if (marked_bytes > 0) { | |
829 | 1474 set_bit_for_region(hr); |
342 | 1475 } |
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1476 |
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1477 // Set the marked bytes for the current region so that |
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1478 // it can be queried by a calling verificiation routine |
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1479 _region_marked_bytes = marked_bytes; |
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1480 |
342 | 1481 return false; |
1482 } | |
1483 | |
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1484 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1485 }; |
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1486 |
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1487 // Heap region closure used for verifying the counting data |
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1488 // that was accumulated concurrently and aggregated during |
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1489 // the remark pause. This closure is applied to the heap |
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1490 // regions during the STW cleanup pause. |
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1491 |
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1492 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1493 G1CollectedHeap* _g1h; |
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1494 ConcurrentMark* _cm; |
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1495 CalcLiveObjectsClosure _calc_cl; |
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1496 BitMap* _region_bm; // Region BM to be verified |
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1497 BitMap* _card_bm; // Card BM to be verified |
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1498 bool _verbose; // verbose output? |
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1499 |
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1500 BitMap* _exp_region_bm; // Expected Region BM values |
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1501 BitMap* _exp_card_bm; // Expected card BM values |
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1502 |
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1503 int _failures; |
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1504 |
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1505 public: |
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1506 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1507 BitMap* region_bm, |
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1508 BitMap* card_bm, |
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1509 BitMap* exp_region_bm, |
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1510 BitMap* exp_card_bm, |
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1511 bool verbose) : |
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1512 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1513 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1514 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1515 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1516 _failures(0) { } |
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1517 |
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1518 int failures() const { return _failures; } |
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1519 |
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1520 bool doHeapRegion(HeapRegion* hr) { |
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1521 if (hr->continuesHumongous()) { |
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1522 // We will ignore these here and process them when their |
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1523 // associated "starts humongous" region is processed (see |
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1524 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1525 // associated "starts humongous" region to have their bit set to |
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1526 // 1 since, due to the region chunking in the parallel region |
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1527 // iteration, a "continues humongous" region might be visited |
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1528 // before its associated "starts humongous". |
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1529 return false; |
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1530 } |
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1531 |
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1532 int failures = 0; |
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1533 |
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1534 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1535 // this region and set the corresponding bits in the expected region |
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1536 // and card bitmaps. |
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1537 bool res = _calc_cl.doHeapRegion(hr); |
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1538 assert(res == false, "should be continuing"); |
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1539 |
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1540 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1541 Mutex::_no_safepoint_check_flag); |
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1542 |
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1543 // Verify the marked bytes for this region. |
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1544 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1545 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1546 |
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1547 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1548 // we have missed accounting some objects during the actual marking. |
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1549 if (exp_marked_bytes > act_marked_bytes) { |
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1550 if (_verbose) { |
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1551 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1552 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1553 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1554 } |
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1555 failures += 1; |
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1556 } |
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1557 |
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1558 // Verify the bit, for this region, in the actual and expected |
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1559 // (which was just calculated) region bit maps. |
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1560 // We're not OK if the bit in the calculated expected region |
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1561 // bitmap is set and the bit in the actual region bitmap is not. |
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1562 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
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1563 |
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1564 bool expected = _exp_region_bm->at(index); |
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1565 bool actual = _region_bm->at(index); |
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1566 if (expected && !actual) { |
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1567 if (_verbose) { |
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1568 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1569 "expected: %s, actual: %s", |
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1570 hr->hrs_index(), |
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1571 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1572 } |
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1573 failures += 1; |
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1574 } |
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1575 |
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1576 // Verify that the card bit maps for the cards spanned by the current |
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1577 // region match. We have an error if we have a set bit in the expected |
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1578 // bit map and the corresponding bit in the actual bitmap is not set. |
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1579 |
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1580 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1581 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1582 |
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1583 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1584 expected = _exp_card_bm->at(i); |
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1585 actual = _card_bm->at(i); |
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1586 |
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1587 if (expected && !actual) { |
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1588 if (_verbose) { |
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1589 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1590 "expected: %s, actual: %s", |
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1591 hr->hrs_index(), i, |
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1592 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1593 } |
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1594 failures += 1; |
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1595 } |
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1596 } |
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1597 |
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1598 if (failures > 0 && _verbose) { |
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1599 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1600 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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1601 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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1602 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1603 } |
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1604 |
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1605 _failures += failures; |
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1606 |
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1607 // We could stop iteration over the heap when we |
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1608 // find the first violating region by returning true. |
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1609 return false; |
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1610 } |
342 | 1611 }; |
1612 | |
1613 | |
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1614 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1615 protected: |
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1616 G1CollectedHeap* _g1h; |
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1617 ConcurrentMark* _cm; |
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1618 BitMap* _actual_region_bm; |
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1619 BitMap* _actual_card_bm; |
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1620 |
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1621 uint _n_workers; |
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1622 |
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1623 BitMap* _expected_region_bm; |
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1624 BitMap* _expected_card_bm; |
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1625 |
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1626 int _failures; |
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1627 bool _verbose; |
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1628 |
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1629 public: |
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1630 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1631 BitMap* region_bm, BitMap* card_bm, |
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1632 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1633 : AbstractGangTask("G1 verify final counting"), |
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1634 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1635 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1636 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1637 _failures(0), _verbose(false), |
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1638 _n_workers(0) { |
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1639 assert(VerifyDuringGC, "don't call this otherwise"); |
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1640 |
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1641 // Use the value already set as the number of active threads |
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1642 // in the call to run_task(). |
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1643 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1644 assert( _g1h->workers()->active_workers() > 0, |
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1645 "Should have been previously set"); |
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1646 _n_workers = _g1h->workers()->active_workers(); |
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1647 } else { |
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1648 _n_workers = 1; |
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|
1649 } |
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|
1650 |
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1651 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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1652 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1653 |
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1654 _verbose = _cm->verbose_medium(); |
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|
1655 } |
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|
1656 |
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|
1657 void work(uint worker_id) { |
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|
1658 assert(worker_id < _n_workers, "invariant"); |
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|
1659 |
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1660 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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1661 _actual_region_bm, _actual_card_bm, |
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|
1662 _expected_region_bm, |
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|
1663 _expected_card_bm, |
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|
1664 _verbose); |
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|
1665 |
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|
1666 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1667 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1668 worker_id, |
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|
1669 _n_workers, |
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|
1670 HeapRegion::VerifyCountClaimValue); |
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|
1671 } else { |
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|
1672 _g1h->heap_region_iterate(&verify_cl); |
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|
1673 } |
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|
1674 |
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|
1675 Atomic::add(verify_cl.failures(), &_failures); |
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|
1676 } |
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|
1677 |
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|
1678 int failures() const { return _failures; } |
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|
1679 }; |
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|
1680 |
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|
1681 // Closure that finalizes the liveness counting data. |
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1682 // Used during the cleanup pause. |
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|
1683 // Sets the bits corresponding to the interval [NTAMS, top] |
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|
1684 // (which contains the implicitly live objects) in the |
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|
1685 // card liveness bitmap. Also sets the bit for each region, |
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|
1686 // containing live data, in the region liveness bitmap. |
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|
1687 |
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|
1688 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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|
1689 public: |
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|
1690 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
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|
1691 BitMap* region_bm, |
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|
1692 BitMap* card_bm) : |
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|
1693 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1694 |
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|
1695 bool doHeapRegion(HeapRegion* hr) { |
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|
1696 |
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|
1697 if (hr->continuesHumongous()) { |
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|
1698 // We will ignore these here and process them when their |
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1699 // associated "starts humongous" region is processed (see |
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|
1700 // set_bit_for_heap_region()). Note that we cannot rely on their |
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|
1701 // associated "starts humongous" region to have their bit set to |
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1702 // 1 since, due to the region chunking in the parallel region |
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|
1703 // iteration, a "continues humongous" region might be visited |
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|
1704 // before its associated "starts humongous". |
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1705 return false; |
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|
1706 } |
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|
1707 |
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|
1708 HeapWord* ntams = hr->next_top_at_mark_start(); |
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|
1709 HeapWord* top = hr->top(); |
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|
1710 |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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6011
diff
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|
1711 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1712 |
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|
1713 // Mark the allocated-since-marking portion... |
d30fa85f9994
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|
1714 if (ntams < top) { |
d30fa85f9994
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|
1715 // This definitely means the region has live objects. |
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|
1716 set_bit_for_region(hr); |
6812
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|
1717 |
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|
1718 // Now set the bits in the card bitmap for [ntams, top) |
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|
1719 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1720 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
988bf00cc564
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|
1721 |
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|
1722 // Note: if we're looking at the last region in heap - top |
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1723 // could be actually just beyond the end of the heap; end_idx |
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1724 // will then correspond to a (non-existent) card that is also |
988bf00cc564
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|
1725 // just beyond the heap. |
988bf00cc564
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|
1726 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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|
1727 // end of object is not card aligned - increment to cover |
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|
1728 // all the cards spanned by the object |
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|
1729 end_idx += 1; |
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|
1730 } |
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|
1731 |
988bf00cc564
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|
1732 assert(end_idx <= _card_bm->size(), |
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|
1733 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1734 end_idx, _card_bm->size())); |
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|
1735 assert(start_idx < _card_bm->size(), |
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changeset
|
1736 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1737 start_idx, _card_bm->size())); |
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|
1738 |
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|
1739 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
da91efe96a93
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|
1740 } |
4836
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|
1741 |
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|
1742 // Set the bit for the region if it contains live data |
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|
1743 if (hr->next_marked_bytes() > 0) { |
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1744 set_bit_for_region(hr); |
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|
1745 } |
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|
1746 |
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|
1747 return false; |
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|
1748 } |
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|
1749 }; |
342 | 1750 |
1751 class G1ParFinalCountTask: public AbstractGangTask { | |
1752 protected: | |
1753 G1CollectedHeap* _g1h; | |
4836
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|
1754 ConcurrentMark* _cm; |
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|
1755 BitMap* _actual_region_bm; |
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|
1756 BitMap* _actual_card_bm; |
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|
1757 |
4728
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|
1758 uint _n_workers; |
4836
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1759 |
342 | 1760 public: |
4836
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1761 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1762 : AbstractGangTask("G1 final counting"), |
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1763 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1764 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1765 _n_workers(0) { |
4095
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|
1766 // Use the value already set as the number of active threads |
6011 | 1767 // in the call to run_task(). |
4095
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1768 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1769 assert( _g1h->workers()->active_workers() > 0, |
bca17e38de00
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|
1770 "Should have been previously set"); |
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|
1771 _n_workers = _g1h->workers()->active_workers(); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
1772 } else { |
342 | 1773 _n_workers = 1; |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
1774 } |
342 | 1775 } |
1776 | |
4728
441e946dc1af
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|
1777 void work(uint worker_id) { |
4836
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|
1778 assert(worker_id < _n_workers, "invariant"); |
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|
1779 |
6812
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|
1780 FinalCountDataUpdateClosure final_update_cl(_g1h, |
4836
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1781 _actual_region_bm, |
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|
1782 _actual_card_bm); |
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|
1783 |
1833
8b10f48633dc
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changeset
|
1784 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4836
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1785 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1786 worker_id, |
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|
1787 _n_workers, |
355 | 1788 HeapRegion::FinalCountClaimValue); |
342 | 1789 } else { |
4836
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1790 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1791 } |
1792 } | |
1793 }; | |
1794 | |
1795 class G1ParNoteEndTask; | |
1796 | |
1797 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1798 G1CollectedHeap* _g1; | |
1799 int _worker_num; | |
1800 size_t _max_live_bytes; | |
6010
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1801 uint _regions_claimed; |
342 | 1802 size_t _freed_bytes; |
2173 | 1803 FreeRegionList* _local_cleanup_list; |
4072 | 1804 OldRegionSet* _old_proxy_set; |
2173 | 1805 HumongousRegionSet* _humongous_proxy_set; |
1806 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1807 double _claimed_region_time; |
1808 double _max_region_time; | |
1809 | |
1810 public: | |
1811 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1812 int worker_num, |
1813 FreeRegionList* local_cleanup_list, | |
4072 | 1814 OldRegionSet* old_proxy_set, |
2173 | 1815 HumongousRegionSet* humongous_proxy_set, |
4093
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|
1816 HRRSCleanupTask* hrrs_cleanup_task) : |
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|
1817 _g1(g1), _worker_num(worker_num), |
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1818 _max_live_bytes(0), _regions_claimed(0), |
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|
1819 _freed_bytes(0), |
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|
1820 _claimed_region_time(0.0), _max_region_time(0.0), |
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|
1821 _local_cleanup_list(local_cleanup_list), |
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1822 _old_proxy_set(old_proxy_set), |
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1823 _humongous_proxy_set(humongous_proxy_set), |
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|
1824 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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|
1825 |
342 | 1826 size_t freed_bytes() { return _freed_bytes; } |
1827 | |
4093
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|
1828 bool doHeapRegion(HeapRegion *hr) { |
6254
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1829 if (hr->continuesHumongous()) { |
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|
1830 return false; |
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|
1831 } |
4093
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|
1832 // We use a claim value of zero here because all regions |
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|
1833 // were claimed with value 1 in the FinalCount task. |
6254
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|
1834 _g1->reset_gc_time_stamps(hr); |
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|
1835 double start = os::elapsedTime(); |
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|
1836 _regions_claimed++; |
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|
1837 hr->note_end_of_marking(); |
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|
1838 _max_live_bytes += hr->max_live_bytes(); |
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|
1839 _g1->free_region_if_empty(hr, |
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|
1840 &_freed_bytes, |
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|
1841 _local_cleanup_list, |
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|
1842 _old_proxy_set, |
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|
1843 _humongous_proxy_set, |
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|
1844 _hrrs_cleanup_task, |
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|
1845 true /* par */); |
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|
1846 double region_time = (os::elapsedTime() - start); |
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|
1847 _claimed_region_time += region_time; |
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|
1848 if (region_time > _max_region_time) { |
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|
1849 _max_region_time = region_time; |
4093
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|
1850 } |
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|
1851 return false; |
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|
1852 } |
342 | 1853 |
1854 size_t max_live_bytes() { return _max_live_bytes; } | |
6010
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|
1855 uint regions_claimed() { return _regions_claimed; } |
342 | 1856 double claimed_region_time_sec() { return _claimed_region_time; } |
1857 double max_region_time_sec() { return _max_region_time; } | |
1858 }; | |
1859 | |
1860 class G1ParNoteEndTask: public AbstractGangTask { | |
1861 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1862 |
342 | 1863 protected: |
1864 G1CollectedHeap* _g1h; | |
1865 size_t _max_live_bytes; | |
1866 size_t _freed_bytes; | |
2152 | 1867 FreeRegionList* _cleanup_list; |
1868 | |
342 | 1869 public: |
1870 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1871 FreeRegionList* cleanup_list) : |
342 | 1872 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1873 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1874 |
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1875 void work(uint worker_id) { |
342 | 1876 double start = os::elapsedTime(); |
2173 | 1877 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1878 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1879 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1880 HRRSCleanupTask hrrs_cleanup_task; | |
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1881 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1882 &old_proxy_set, |
2173 | 1883 &humongous_proxy_set, |
1884 &hrrs_cleanup_task); | |
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1885 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1886 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1887 _g1h->workers()->active_workers(), |
355 | 1888 HeapRegion::NoteEndClaimValue); |
342 | 1889 } else { |
1890 _g1h->heap_region_iterate(&g1_note_end); | |
1891 } | |
1892 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1893 | |
2152 | 1894 // Now update the lists |
1895 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1896 NULL /* free_list */, | |
4072 | 1897 &old_proxy_set, |
2173 | 1898 &humongous_proxy_set, |
2152 | 1899 true /* par */); |
342 | 1900 { |
1901 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1902 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1903 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1904 |
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1905 // If we iterate over the global cleanup list at the end of |
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1906 // cleanup to do this printing we will not guarantee to only |
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1907 // generate output for the newly-reclaimed regions (the list |
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1908 // might not be empty at the beginning of cleanup; we might |
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1909 // still be working on its previous contents). So we do the |
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1910 // printing here, before we append the new regions to the global |
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1911 // cleanup list. |
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1912 |
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1913 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1914 if (hr_printer->is_active()) { |
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1915 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1916 while (iter.more_available()) { |
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1917 HeapRegion* hr = iter.get_next(); |
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1918 hr_printer->cleanup(hr); |
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1919 } |
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1920 } |
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1921 |
2173 | 1922 _cleanup_list->add_as_tail(&local_cleanup_list); |
1923 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1924 | |
1925 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1926 } |
1927 } | |
1928 size_t max_live_bytes() { return _max_live_bytes; } | |
1929 size_t freed_bytes() { return _freed_bytes; } | |
1930 }; | |
1931 | |
1932 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1933 protected: | |
1934 G1RemSet* _g1rs; | |
1935 BitMap* _region_bm; | |
1936 BitMap* _card_bm; | |
1937 public: | |
1938 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1939 BitMap* region_bm, BitMap* card_bm) : | |
1940 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1941 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1942 |
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1943 void work(uint worker_id) { |
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1944 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1945 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1946 HeapRegion::ScrubRemSetClaimValue); |
342 | 1947 } else { |
1948 _g1rs->scrub(_region_bm, _card_bm); | |
1949 } | |
1950 } | |
1951 | |
1952 }; | |
1953 | |
1954 void ConcurrentMark::cleanup() { | |
1955 // world is stopped at this checkpoint | |
1956 assert(SafepointSynchronize::is_at_safepoint(), | |
1957 "world should be stopped"); | |
1958 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1959 | |
1960 // If a full collection has happened, we shouldn't do this. | |
1961 if (has_aborted()) { | |
1962 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1963 return; | |
1964 } | |
1965 | |
4072 | 1966 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1967 g1h->verify_region_sets_optional(); |
1968 | |
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1969 if (VerifyDuringGC) { |
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1970 HandleMark hm; // handle scope |
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1971 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1972 Universe::heap()->prepare_for_verify(); |
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1973 Universe::verify(/* silent */ false, |
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1974 /* option */ VerifyOption_G1UsePrevMarking); |
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1975 } |
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1976 |
342 | 1977 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1978 g1p->record_concurrent_mark_cleanup_start(); | |
1979 | |
1980 double start = os::elapsedTime(); | |
1981 | |
2173 | 1982 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1983 | |
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1984 uint n_workers; |
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1985 |
342 | 1986 // Do counting once more with the world stopped for good measure. |
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1987 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1988 |
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1989 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1990 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1991 "sanity check"); |
1992 | |
4711 | 1993 g1h->set_par_threads(); |
1994 n_workers = g1h->n_par_threads(); | |
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1995 assert(g1h->n_par_threads() == n_workers, |
4711 | 1996 "Should not have been reset"); |
342 | 1997 g1h->workers()->run_task(&g1_par_count_task); |
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1998 // Done with the parallel phase so reset to 0. |
342 | 1999 g1h->set_par_threads(0); |
355 | 2000 |
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2001 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2002 "sanity check"); |
342 | 2003 } else { |
4711 | 2004 n_workers = 1; |
342 | 2005 g1_par_count_task.work(0); |
2006 } | |
2007 | |
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2008 if (VerifyDuringGC) { |
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2009 // Verify that the counting data accumulated during marking matches |
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2010 // that calculated by walking the marking bitmap. |
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2011 |
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2012 // Bitmaps to hold expected values |
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2013 BitMap expected_region_bm(_region_bm.size(), false); |
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2014 BitMap expected_card_bm(_card_bm.size(), false); |
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2015 |
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2016 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2017 &_region_bm, |
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2018 &_card_bm, |
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2019 &expected_region_bm, |
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2020 &expected_card_bm); |
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2021 |
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2022 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2023 g1h->set_par_threads((int)n_workers); |
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2024 g1h->workers()->run_task(&g1_par_verify_task); |
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2025 // Done with the parallel phase so reset to 0. |
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2026 g1h->set_par_threads(0); |
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2027 |
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2028 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2029 "sanity check"); |
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2030 } else { |
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2031 g1_par_verify_task.work(0); |
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2032 } |
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2033 |
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2034 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2035 } |
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2036 |
342 | 2037 size_t start_used_bytes = g1h->used(); |
2038 g1h->set_marking_complete(); | |
2039 | |
2040 double count_end = os::elapsedTime(); | |
2041 double this_final_counting_time = (count_end - start); | |
2042 _total_counting_time += this_final_counting_time; | |
2043 | |
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2044 if (G1PrintRegionLivenessInfo) { |
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2045 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2046 _g1h->heap_region_iterate(&cl); |
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2047 } |
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2048 |
342 | 2049 // Install newly created mark bitMap as "prev". |
2050 swapMarkBitMaps(); | |
2051 | |
2052 g1h->reset_gc_time_stamp(); | |
2053 | |
2054 // Note end of marking in all heap regions. | |
2152 | 2055 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2056 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2057 g1h->set_par_threads((int)n_workers); |
342 | 2058 g1h->workers()->run_task(&g1_par_note_end_task); |
2059 g1h->set_par_threads(0); | |
355 | 2060 |
2061 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2062 "sanity check"); | |
342 | 2063 } else { |
2064 g1_par_note_end_task.work(0); | |
2065 } | |
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2066 g1h->check_gc_time_stamps(); |
2152 | 2067 |
2068 if (!cleanup_list_is_empty()) { | |
2069 // The cleanup list is not empty, so we'll have to process it | |
2070 // concurrently. Notify anyone else that might be wanting free | |
2071 // regions that there will be more free regions coming soon. | |
2072 g1h->set_free_regions_coming(); | |
2073 } | |
342 | 2074 |
2075 // call below, since it affects the metric by which we sort the heap | |
2076 // regions. | |
2077 if (G1ScrubRemSets) { | |
2078 double rs_scrub_start = os::elapsedTime(); | |
2079 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2080 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2081 g1h->set_par_threads((int)n_workers); |
342 | 2082 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2083 g1h->set_par_threads(0); | |
355 | 2084 |
2085 assert(g1h->check_heap_region_claim_values( | |
2086 HeapRegion::ScrubRemSetClaimValue), | |
2087 "sanity check"); | |
342 | 2088 } else { |
2089 g1_par_scrub_rs_task.work(0); | |
2090 } | |
2091 | |
2092 double rs_scrub_end = os::elapsedTime(); | |
2093 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2094 _total_rs_scrub_time += this_rs_scrub_time; | |
2095 } | |
2096 | |
2097 // this will also free any regions totally full of garbage objects, | |
2098 // and sort the regions. | |
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2099 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2100 |
2101 // Statistics. | |
2102 double end = os::elapsedTime(); | |
2103 _cleanup_times.add((end - start) * 1000.0); | |
2104 | |
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2105 if (G1Log::fine()) { |
342 | 2106 g1h->print_size_transition(gclog_or_tty, |
2107 start_used_bytes, | |
2108 g1h->used(), | |
2109 g1h->capacity()); | |
2110 } | |
2111 | |
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2112 // Clean up will have freed any regions completely full of garbage. |
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2113 // Update the soft reference policy with the new heap occupancy. |
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2114 Universe::update_heap_info_at_gc(); |
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2115 |
342 | 2116 // We need to make this be a "collection" so any collection pause that |
2117 // races with it goes around and waits for completeCleanup to finish. | |
2118 g1h->increment_total_collections(); | |
2119 | |
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2120 // We reclaimed old regions so we should calculate the sizes to make |
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2121 // sure we update the old gen/space data. |
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2122 g1h->g1mm()->update_sizes(); |
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2123 |
751 | 2124 if (VerifyDuringGC) { |
845
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2125 HandleMark hm; // handle scope |
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2126 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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2127 Universe::heap()->prepare_for_verify(); |
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2128 Universe::verify(/* silent */ false, |
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2129 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 2130 } |
2152 | 2131 |
2132 g1h->verify_region_sets_optional(); | |
342 | 2133 } |
2134 | |
2135 void ConcurrentMark::completeCleanup() { | |
2136 if (has_aborted()) return; | |
2137 | |
2152 | 2138 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2139 | |
2140 _cleanup_list.verify_optional(); | |
2361 | 2141 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2142 |
2143 if (G1ConcRegionFreeingVerbose) { | |
2144 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2145 "cleanup list has %u entries", |
2152 | 2146 _cleanup_list.length()); |
2147 } | |
2148 | |
2149 // Noone else should be accessing the _cleanup_list at this point, | |
2150 // so it's not necessary to take any locks | |
2151 while (!_cleanup_list.is_empty()) { | |
2152 HeapRegion* hr = _cleanup_list.remove_head(); | |
2153 assert(hr != NULL, "the list was not empty"); | |
3317
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2154 hr->par_clear(); |
2361 | 2155 tmp_free_list.add_as_tail(hr); |
2152 | 2156 |
2157 // Instead of adding one region at a time to the secondary_free_list, | |
2158 // we accumulate them in the local list and move them a few at a | |
2159 // time. This also cuts down on the number of notify_all() calls | |
2160 // we do during this process. We'll also append the local list when | |
2161 // _cleanup_list is empty (which means we just removed the last | |
2162 // region from the _cleanup_list). | |
2361 | 2163 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2164 _cleanup_list.is_empty()) { |
2165 if (G1ConcRegionFreeingVerbose) { | |
2166 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2167 "appending %u entries to the secondary_free_list, " |
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2168 "cleanup list still has %u entries", |
2361 | 2169 tmp_free_list.length(), |
2152 | 2170 _cleanup_list.length()); |
342 | 2171 } |
2152 | 2172 |
2173 { | |
2174 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2175 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2176 SecondaryFreeList_lock->notify_all(); |
2177 } | |
2178 | |
2179 if (G1StressConcRegionFreeing) { | |
2180 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2181 os::sleep(Thread::current(), (jlong) 1, false); | |
2182 } | |
2183 } | |
342 | 2184 } |
2185 } | |
2361 | 2186 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2187 } |
2188 | |
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2189 // Supporting Object and Oop closures for reference discovery |
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2190 // and processing in during marking |
2174
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2191 |
2037
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|
2192 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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2193 HeapWord* addr = (HeapWord*)obj; |
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|
2194 return addr != NULL && |
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|
2195 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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|
2196 } |
342 | 2197 |
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2198 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
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2199 // Uses the CMTask associated with a worker thread (for serial reference |
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2200 // processing the CMTask for worker 0 is used) to preserve (mark) and |
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|
2201 // trace referent objects. |
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|
2202 // |
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2203 // Using the CMTask and embedded local queues avoids having the worker |
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|
2204 // threads operating on the global mark stack. This reduces the risk |
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|
2205 // of overflowing the stack - which we would rather avoid at this late |
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|
2206 // state. Also using the tasks' local queues removes the potential |
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2207 // of the workers interfering with each other that could occur if |
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|
2208 // operating on the global stack. |
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|
2209 |
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|
2210 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
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|
2211 ConcurrentMark* _cm; |
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|
2212 CMTask* _task; |
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|
2213 int _ref_counter_limit; |
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|
2214 int _ref_counter; |
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|
2215 bool _is_serial; |
2174
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|
2216 public: |
8787
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|
2217 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
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2218 _cm(cm), _task(task), _is_serial(is_serial), |
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|
2219 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
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|
2220 assert(_ref_counter_limit > 0, "sanity"); |
8787
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|
2221 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
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|
2222 _ref_counter = _ref_counter_limit; |
234761c55641
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|
2223 } |
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|
2224 |
234761c55641
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|
2225 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
234761c55641
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|
2226 virtual void do_oop( oop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2227 |
234761c55641
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|
2228 template <class T> void do_oop_work(T* p) { |
234761c55641
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2152
diff
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|
2229 if (!_cm->has_overflown()) { |
234761c55641
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|
2230 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
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|
2231 if (_cm->verbose_high()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
2232 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
234761c55641
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2152
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|
2233 "*"PTR_FORMAT" = "PTR_FORMAT, |
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|
2234 _task->worker_id(), p, (void*) obj); |
3776
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|
2235 } |
2174
234761c55641
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|
2236 |
234761c55641
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|
2237 _task->deal_with_reference(obj); |
234761c55641
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2152
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|
2238 _ref_counter--; |
234761c55641
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|
2239 |
234761c55641
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|
2240 if (_ref_counter == 0) { |
8014
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|
2241 // We have dealt with _ref_counter_limit references, pushing them |
f90b9bceb8e5
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|
2242 // and objects reachable from them on to the local stack (and |
f90b9bceb8e5
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|
2243 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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|
2244 // process these entries. |
f90b9bceb8e5
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|
2245 // |
f90b9bceb8e5
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|
2246 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
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|
2247 // there's nothing more to do (i.e. we're done with the entries that |
f90b9bceb8e5
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|
2248 // were pushed as a result of the CMTask::deal_with_reference() calls |
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|
2249 // above) or we overflow. |
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|
2250 // |
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|
2251 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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|
2252 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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|
2253 // the beginning of CMTask::do_marking_step() for those conditions - |
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|
2254 // one of which is reaching the specified time target.) It is only |
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|
2255 // when CMTask::do_marking_step() returns without setting the |
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|
2256 // has_aborted() flag that the marking step has completed. |
2174
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|
2257 do { |
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|
2258 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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|
2259 _task->do_marking_step(mark_step_duration_ms, |
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|
2260 false /* do_termination */, |
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|
2261 _is_serial); |
2174
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2262 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2263 _ref_counter = _ref_counter_limit; |
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|
2264 } |
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2265 } else { |
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2266 if (_cm->verbose_high()) { |
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2267 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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2268 } |
2174
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|
2269 } |
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|
2270 } |
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|
2271 }; |
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|
2272 |
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|
2273 // 'Drain' oop closure used by both serial and parallel reference processing. |
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|
2274 // Uses the CMTask associated with a given worker thread (for serial |
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|
2275 // reference processing the CMtask for worker 0 is used). Calls the |
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|
2276 // do_marking_step routine, with an unbelievably large timeout value, |
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|
2277 // to drain the marking data structures of the remaining entries |
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|
2278 // added by the 'keep alive' oop closure above. |
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|
2279 |
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|
2280 class G1CMDrainMarkingStackClosure: public VoidClosure { |
2174
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2281 ConcurrentMark* _cm; |
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2282 CMTask* _task; |
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2283 bool _is_serial; |
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2284 public: |
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2285 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2286 _cm(cm), _task(task), _is_serial(is_serial) { |
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2287 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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2288 } |
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2289 |
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2290 void do_void() { |
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2291 do { |
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2292 if (_cm->verbose_high()) { |
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2293 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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2294 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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2295 } |
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2296 |
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2297 // We call CMTask::do_marking_step() to completely drain the local |
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2298 // and global marking stacks of entries pushed by the 'keep alive' |
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2299 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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2300 // |
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2301 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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2302 // if there's nothing more to do (i.e. we'completely drained the |
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2303 // entries that were pushed as a a result of applying the 'keep alive' |
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2304 // closure to the entries on the discovered ref lists) or we overflow |
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2305 // the global marking stack. |
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2306 // |
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2307 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2308 // flag while there may still be some work to do. (See the comment at |
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2309 // the beginning of CMTask::do_marking_step() for those conditions - |
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2310 // one of which is reaching the specified time target.) It is only |
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2311 // when CMTask::do_marking_step() returns without setting the |
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2312 // has_aborted() flag that the marking step has completed. |
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2313 |
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2314 _task->do_marking_step(1000000000.0 /* something very large */, |
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2315 true /* do_termination */, |
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2316 _is_serial); |
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2317 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2318 } |
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2319 }; |
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2320 |
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2321 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2322 // reference processing at the end of G1 concurrent marking |
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2323 |
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2324 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2325 private: |
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2326 G1CollectedHeap* _g1h; |
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2327 ConcurrentMark* _cm; |
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2328 WorkGang* _workers; |
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2329 int _active_workers; |
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2330 |
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2331 public: |
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2332 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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2333 ConcurrentMark* cm, |
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2334 WorkGang* workers, |
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2335 int n_workers) : |
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2336 _g1h(g1h), _cm(cm), |
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2337 _workers(workers), _active_workers(n_workers) { } |
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2338 |
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2339 // Executes the given task using concurrent marking worker threads. |
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2340 virtual void execute(ProcessTask& task); |
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|
2341 virtual void execute(EnqueueTask& task); |
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2342 }; |
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2343 |
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2344 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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2345 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2346 ProcessTask& _proc_task; |
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2347 G1CollectedHeap* _g1h; |
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2348 ConcurrentMark* _cm; |
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2349 |
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2350 public: |
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2351 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
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2352 G1CollectedHeap* g1h, |
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2353 ConcurrentMark* cm) : |
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2354 AbstractGangTask("Process reference objects in parallel"), |
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2355 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
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2356 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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2357 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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2358 } |
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2359 |
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2360 virtual void work(uint worker_id) { |
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2361 CMTask* task = _cm->task(worker_id); |
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2362 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2363 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
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2364 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
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2365 |
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2366 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2367 } |
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2368 }; |
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2369 |
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2370 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2371 assert(_workers != NULL, "Need parallel worker threads."); |
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2372 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2373 |
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2374 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
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2375 |
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2376 // We need to reset the concurrency level before each |
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2377 // proxy task execution, so that the termination protocol |
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2378 // and overflow handling in CMTask::do_marking_step() knows |
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2379 // how many workers to wait for. |
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2380 _cm->set_concurrency(_active_workers); |
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2381 _g1h->set_par_threads(_active_workers); |
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2382 _workers->run_task(&proc_task_proxy); |
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2383 _g1h->set_par_threads(0); |
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2384 } |
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2385 |
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2386 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
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2387 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2388 EnqueueTask& _enq_task; |
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2389 |
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2390 public: |
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2391 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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2392 AbstractGangTask("Enqueue reference objects in parallel"), |
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2393 _enq_task(enq_task) { } |
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2394 |
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2395 virtual void work(uint worker_id) { |
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2396 _enq_task.work(worker_id); |
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2397 } |
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2398 }; |
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2399 |
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2400 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2401 assert(_workers != NULL, "Need parallel worker threads."); |
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2402 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2403 |
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2404 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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2405 |
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2406 // Not strictly necessary but... |
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|
2407 // |
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|
2408 // We need to reset the concurrency level before each |
e864cc14ca75
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|
2409 // proxy task execution, so that the termination protocol |
e864cc14ca75
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|
2410 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
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|
2411 // how many workers to wait for. |
e864cc14ca75
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|
2412 _cm->set_concurrency(_active_workers); |
2174
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|
2413 _g1h->set_par_threads(_active_workers); |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2414 _workers->run_task(&enq_task_proxy); |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2415 _g1h->set_par_threads(0); |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
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|
2416 } |
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diff
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|
2417 |
342 | 2418 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
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|
2419 if (has_overflown()) { |
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|
2420 // Skip processing the discovered references if we have |
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|
2421 // overflown the global marking stack. Reference objects |
e864cc14ca75
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|
2422 // only get discovered once so it is OK to not |
e864cc14ca75
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|
2423 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
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|
2424 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
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|
2425 // less reference objects are discovered. |
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|
2426 return; |
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diff
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|
2427 } |
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|
2428 |
342 | 2429 ResourceMark rm; |
2430 HandleMark hm; | |
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|
2431 |
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|
2432 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2433 |
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|
2434 // Is alive closure. |
1847b501ae74
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|
2435 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2436 |
1847b501ae74
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diff
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|
2437 // Inner scope to exclude the cleaning of the string and symbol |
1847b501ae74
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diff
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|
2438 // tables from the displayed time. |
1847b501ae74
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diff
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|
2439 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
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|
2440 if (G1Log::finer()) { |
3975
1847b501ae74
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|
2441 gclog_or_tty->put(' '); |
1847b501ae74
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diff
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|
2442 } |
6007
5c86f8211d1e
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brutisso
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|
2443 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
3975
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|
2444 |
3979
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|
2445 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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|
2446 |
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|
2447 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
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|
2448 // about how reference processing currently works in G1. |
1847b501ae74
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|
2449 |
8014
f90b9bceb8e5
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diff
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|
2450 // Set the soft reference policy |
3975
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|
2451 rp->setup_policy(clear_all_soft_refs); |
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|
2452 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
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|
2453 |
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|
2454 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
fa08949fe0cb
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diff
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|
2455 // in serial reference processing. Note these closures are also |
fa08949fe0cb
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|
2456 // used for serially processing (by the the current thread) the |
fa08949fe0cb
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diff
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|
2457 // JNI references during parallel reference processing. |
fa08949fe0cb
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diff
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|
2458 // |
fa08949fe0cb
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diff
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|
2459 // These closures do not need to synchronize with the worker |
fa08949fe0cb
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diff
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|
2460 // threads involved in parallel reference processing as these |
fa08949fe0cb
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diff
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|
2461 // instances are executed serially by the current thread (e.g. |
fa08949fe0cb
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diff
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|
2462 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
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diff
changeset
|
2463 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
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8744
diff
changeset
|
2464 // |
fa08949fe0cb
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8744
diff
changeset
|
2465 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2466 // their own instances of these closures, which do their own |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2467 // synchronization among themselves. |
fa08949fe0cb
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diff
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|
2468 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
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|
2469 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
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diff
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|
2470 |
fa08949fe0cb
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diff
changeset
|
2471 // We need at least one active thread. If reference processing |
fa08949fe0cb
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diff
changeset
|
2472 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
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diff
changeset
|
2473 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2474 // we utilize all the worker threads we can. |
fa08949fe0cb
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8744
diff
changeset
|
2475 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
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parents:
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diff
changeset
|
2476 uint active_workers = (processing_is_mt ? g1h->workers()->active_workers() : 1U); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2477 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
1847b501ae74
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|
2478 |
8787
fa08949fe0cb
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diff
changeset
|
2479 // Parallel processing task executor. |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2480 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2481 g1h->workers(), active_workers); |
8787
fa08949fe0cb
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diff
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|
2482 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
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diff
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|
2483 |
8788
e864cc14ca75
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parents:
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diff
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|
2484 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
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8787
diff
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|
2485 // executing the remark task. |
e864cc14ca75
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8787
diff
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|
2486 set_concurrency(active_workers); |
e864cc14ca75
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8787
diff
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|
2487 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2488 // Set the degree of MT processing here. If the discovery was done MT, |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2489 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2490 // 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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parents:
8008
diff
changeset
|
2491 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2492 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2493 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2494 // Process the weak references. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2495 rp->process_discovered_references(&g1_is_alive, |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2496 &g1_keep_alive, |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2497 &g1_drain_mark_stack, |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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parents:
8008
diff
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|
2498 executor); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2499 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2500 // The do_oop work routines of the keep_alive and drain_marking_stack |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2501 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2502 // global marking stack. |
3975
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|
2503 |
1847b501ae74
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diff
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|
2504 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
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3914
diff
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|
2505 "mark stack should be empty (unless it overflowed)"); |
8787
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|
2506 |
3975
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diff
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|
2507 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2508 // This should have been done already when we tried to push an |
3975
1847b501ae74
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3914
diff
changeset
|
2509 // entry on to the global mark stack. But let's do it again. |
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parents:
3914
diff
changeset
|
2510 set_has_overflown(); |
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diff
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|
2511 } |
1847b501ae74
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diff
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|
2512 |
8014
f90b9bceb8e5
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diff
changeset
|
2513 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2514 |
f90b9bceb8e5
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diff
changeset
|
2515 rp->enqueue_discovered_references(executor); |
3975
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|
2516 |
1847b501ae74
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diff
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|
2517 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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|
2518 assert(!rp->discovery_enabled(), "Post condition"); |
2174
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|
2519 } |
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|
2520 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2521 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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1974
diff
changeset
|
2522 StringTable::unlink(&g1_is_alive); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2175
diff
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|
2523 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
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coleenp
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2175
diff
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|
2524 SymbolTable::unlink(); |
342 | 2525 } |
2526 | |
2527 void ConcurrentMark::swapMarkBitMaps() { | |
2528 CMBitMapRO* temp = _prevMarkBitMap; | |
2529 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2530 _nextMarkBitMap = (CMBitMap*) temp; | |
2531 } | |
2532 | |
2533 class CMRemarkTask: public AbstractGangTask { | |
2534 private: | |
8787
fa08949fe0cb
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8744
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|
2535 ConcurrentMark* _cm; |
fa08949fe0cb
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8744
diff
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|
2536 bool _is_serial; |
342 | 2537 public: |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2538 void work(uint worker_id) { |
342 | 2539 // Since all available tasks are actually started, we should |
2540 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
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jmasa
parents:
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diff
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|
2541 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
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|
2542 CMTask* task = _cm->task(worker_id); |
342 | 2543 task->record_start_time(); |
2544 do { | |
2174
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|
2545 task->do_marking_step(1000000000.0 /* something very large */, |
8787
fa08949fe0cb
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8744
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|
2546 true /* do_termination */, |
fa08949fe0cb
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|
2547 _is_serial); |
342 | 2548 } while (task->has_aborted() && !_cm->has_overflown()); |
2549 // If we overflow, then we do not want to restart. We instead | |
2550 // want to abort remark and do concurrent marking again. | |
2551 task->record_end_time(); | |
2552 } | |
2553 } | |
2554 | |
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2555 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
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2556 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2557 _cm->terminator()->reset_for_reuse(active_workers); |
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2558 } |
342 | 2559 }; |
2560 | |
2561 void ConcurrentMark::checkpointRootsFinalWork() { | |
2562 ResourceMark rm; | |
2563 HandleMark hm; | |
2564 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2565 | |
2566 g1h->ensure_parsability(false); | |
2567 | |
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2568 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2569 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2570 // this is remark, so we'll use up all active threads |
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2571 uint active_workers = g1h->workers()->active_workers(); |
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2572 if (active_workers == 0) { |
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2573 assert(active_workers > 0, "Should have been set earlier"); |
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2574 active_workers = (uint) ParallelGCThreads; |
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2575 g1h->workers()->set_active_workers(active_workers); |
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2576 } |
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2577 set_concurrency_and_phase(active_workers, false /* concurrent */); |
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2578 // Leave _parallel_marking_threads at it's |
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|
2579 // value originally calculated in the ConcurrentMark |
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2580 // constructor and pass values of the active workers |
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2581 // through the gang in the task. |
342 | 2582 |
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2583 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
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2584 // We will start all available threads, even if we decide that the |
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2585 // active_workers will be fewer. The extra ones will just bail out |
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2586 // immediately. |
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2587 g1h->set_par_threads(active_workers); |
342 | 2588 g1h->workers()->run_task(&remarkTask); |
2589 g1h->set_par_threads(0); | |
2590 } else { | |
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2591 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2592 uint active_workers = 1; |
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2593 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2594 |
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2595 // Note - if there's no work gang then the VMThread will be |
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|
2596 // the thread to execute the remark - serially. We have |
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|
2597 // to pass true for the is_serial parameter so that |
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|
2598 // CMTask::do_marking_step() doesn't enter the sync |
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|
2599 // barriers in the event of an overflow. Doing so will |
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|
2600 // cause an assert that the current thread is not a |
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|
2601 // concurrent GC thread. |
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|
2602 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2603 remarkTask.work(0); |
2604 } | |
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|
2605 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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|
2606 guarantee(has_overflown() || |
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|
2607 satb_mq_set.completed_buffers_num() == 0, |
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|
2608 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
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|
2609 BOOL_TO_STR(has_overflown()), |
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|
2610 satb_mq_set.completed_buffers_num())); |
342 | 2611 |
2612 print_stats(); | |
2613 } | |
2614 | |
1044 | 2615 #ifndef PRODUCT |
2616 | |
1388 | 2617 class PrintReachableOopClosure: public OopClosure { |
342 | 2618 private: |
2619 G1CollectedHeap* _g1h; | |
2620 outputStream* _out; | |
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|
2621 VerifyOption _vo; |
1388 | 2622 bool _all; |
342 | 2623 |
2624 public: | |
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2625 PrintReachableOopClosure(outputStream* out, |
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|
2626 VerifyOption vo, |
1388 | 2627 bool all) : |
1044 | 2628 _g1h(G1CollectedHeap::heap()), |
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2629 _out(out), _vo(vo), _all(all) { } |
342 | 2630 |
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|
2631 void do_oop(narrowOop* p) { do_oop_work(p); } |
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2632 void do_oop( oop* p) { do_oop_work(p); } |
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|
2633 |
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|
2634 template <class T> void do_oop_work(T* p) { |
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2635 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2636 const char* str = NULL; |
2637 const char* str2 = ""; | |
2638 | |
1388 | 2639 if (obj == NULL) { |
2640 str = ""; | |
2641 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2642 str = " O"; | |
2643 } else { | |
342 | 2644 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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|
2645 guarantee(hr != NULL, "invariant"); |
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2646 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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2647 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2648 |
2649 if (over_tams) { | |
1388 | 2650 str = " >"; |
2651 if (marked) { | |
342 | 2652 str2 = " AND MARKED"; |
1044 | 2653 } |
1388 | 2654 } else if (marked) { |
2655 str = " M"; | |
1044 | 2656 } else { |
1388 | 2657 str = " NOT"; |
1044 | 2658 } |
342 | 2659 } |
2660 | |
1388 | 2661 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2662 p, (void*) obj, str, str2); |
2663 } | |
2664 }; | |
2665 | |
1388 | 2666 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2667 private: |
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|
2668 G1CollectedHeap* _g1h; |
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|
2669 outputStream* _out; |
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|
2670 VerifyOption _vo; |
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|
2671 bool _all; |
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|
2672 HeapRegion* _hr; |
342 | 2673 |
2674 public: | |
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|
2675 PrintReachableObjectClosure(outputStream* out, |
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|
2676 VerifyOption vo, |
1388 | 2677 bool all, |
2678 HeapRegion* hr) : | |
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|
2679 _g1h(G1CollectedHeap::heap()), |
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|
2680 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2681 |
2682 void do_object(oop o) { | |
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2683 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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|
2684 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2685 bool print_it = _all || over_tams || marked; |
2686 | |
2687 if (print_it) { | |
2688 _out->print_cr(" "PTR_FORMAT"%s", | |
2689 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
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|
2690 PrintReachableOopClosure oopCl(_out, _vo, _all); |
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6964458: Reimplement class meta-data storage to use native memory
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|
2691 o->oop_iterate_no_header(&oopCl); |
1388 | 2692 } |
342 | 2693 } |
2694 }; | |
2695 | |
1388 | 2696 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2697 private: |
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2698 G1CollectedHeap* _g1h; |
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|
2699 outputStream* _out; |
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|
2700 VerifyOption _vo; |
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|
2701 bool _all; |
342 | 2702 |
2703 public: | |
2704 bool doHeapRegion(HeapRegion* hr) { | |
2705 HeapWord* b = hr->bottom(); | |
2706 HeapWord* e = hr->end(); | |
2707 HeapWord* t = hr->top(); | |
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2708 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2709 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2710 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2711 _out->cr(); |
2712 | |
2713 HeapWord* from = b; | |
2714 HeapWord* to = t; | |
2715 | |
2716 if (to > from) { | |
2717 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2718 _out->cr(); | |
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|
2719 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2720 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2721 _out->cr(); | |
2722 } | |
342 | 2723 |
2724 return false; | |
2725 } | |
2726 | |
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|
2727 PrintReachableRegionClosure(outputStream* out, |
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|
2728 VerifyOption vo, |
1388 | 2729 bool all) : |
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|
2730 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2731 }; |
2732 | |
1388 | 2733 void ConcurrentMark::print_reachable(const char* str, |
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|
2734 VerifyOption vo, |
1388 | 2735 bool all) { |
2736 gclog_or_tty->cr(); | |
2737 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2738 |
2739 if (G1PrintReachableBaseFile == NULL) { | |
2740 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2741 return; | |
2742 } | |
2743 | |
2744 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2745 (JVM_MAXPATHLEN - 1)) { | |
2746 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2747 return; | |
2748 } | |
2749 | |
2750 char file_name[JVM_MAXPATHLEN]; | |
2751 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2752 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2753 | |
2754 fileStream fout(file_name); | |
2755 if (!fout.is_open()) { | |
2756 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2757 return; | |
2758 } | |
2759 | |
2760 outputStream* out = &fout; | |
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2761 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2762 out->cr(); |
2763 | |
1388 | 2764 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2765 out->cr(); |
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|
2766 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2767 _g1h->heap_region_iterate(&rcl); |
1044 | 2768 out->cr(); |
2769 | |
2770 gclog_or_tty->print_cr(" done"); | |
1388 | 2771 gclog_or_tty->flush(); |
342 | 2772 } |
2773 | |
1044 | 2774 #endif // PRODUCT |
2775 | |
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|
2776 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2777 // Note we are overriding the read-only view of the prev map here, via |
2778 // the cast. | |
2779 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2780 } |
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2781 |
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|
2782 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2783 _nextMarkBitMap->clearRange(mr); |
2784 } | |
2785 | |
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|
2786 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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|
2787 clearRangePrevBitmap(mr); |
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|
2788 clearRangeNextBitmap(mr); |
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|
2789 } |
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|
2790 |
342 | 2791 HeapRegion* |
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|
2792 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2793 // "checkpoint" the finger |
2794 HeapWord* finger = _finger; | |
2795 | |
2796 // _heap_end will not change underneath our feet; it only changes at | |
2797 // yield points. | |
2798 while (finger < _heap_end) { | |
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2799 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2800 |
3771 | 2801 // Note on how this code handles humongous regions. In the |
2802 // normal case the finger will reach the start of a "starts | |
2803 // humongous" (SH) region. Its end will either be the end of the | |
2804 // last "continues humongous" (CH) region in the sequence, or the | |
2805 // standard end of the SH region (if the SH is the only region in | |
2806 // the sequence). That way claim_region() will skip over the CH | |
2807 // regions. However, there is a subtle race between a CM thread | |
2808 // executing this method and a mutator thread doing a humongous | |
2809 // object allocation. The two are not mutually exclusive as the CM | |
2810 // thread does not need to hold the Heap_lock when it gets | |
2811 // here. So there is a chance that claim_region() will come across | |
2812 // a free region that's in the progress of becoming a SH or a CH | |
2813 // region. In the former case, it will either | |
2814 // a) Miss the update to the region's end, in which case it will | |
2815 // visit every subsequent CH region, will find their bitmaps | |
2816 // empty, and do nothing, or | |
2817 // b) Will observe the update of the region's end (in which case | |
2818 // it will skip the subsequent CH regions). | |
2819 // If it comes across a region that suddenly becomes CH, the | |
2820 // scenario will be similar to b). So, the race between | |
2821 // claim_region() and a humongous object allocation might force us | |
2822 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2823 // iterations) but it should not introduce and correctness issues. | |
2824 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2825 HeapWord* bottom = curr_region->bottom(); |
2826 HeapWord* end = curr_region->end(); | |
2827 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2828 | |
3771 | 2829 if (verbose_low()) { |
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2830 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2831 "["PTR_FORMAT", "PTR_FORMAT"), " |
2832 "limit = "PTR_FORMAT, | |
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2833 worker_id, curr_region, bottom, end, limit); |
3771 | 2834 } |
2835 | |
2836 // Is the gap between reading the finger and doing the CAS too long? | |
2837 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2838 if (res == finger) { |
2839 // we succeeded | |
2840 | |
2841 // notice that _finger == end cannot be guaranteed here since, | |
2842 // someone else might have moved the finger even further | |
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2843 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2844 |
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2845 if (verbose_low()) { |
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2846 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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2847 PTR_FORMAT, worker_id, curr_region); |
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2848 } |
342 | 2849 |
2850 if (limit > bottom) { | |
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2851 if (verbose_low()) { |
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2852 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2853 "returning it ", worker_id, curr_region); |
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2854 } |
342 | 2855 return curr_region; |
2856 } else { | |
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2857 assert(limit == bottom, |
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2858 "the region limit should be at bottom"); |
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|
2859 if (verbose_low()) { |
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2860 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2861 "returning NULL", worker_id, curr_region); |
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2862 } |
342 | 2863 // we return NULL and the caller should try calling |
2864 // claim_region() again. | |
2865 return NULL; | |
2866 } | |
2867 } else { | |
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2868 assert(_finger > finger, "the finger should have moved forward"); |
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|
2869 if (verbose_low()) { |
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|
2870 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 2871 "global finger = "PTR_FORMAT", " |
2872 "our finger = "PTR_FORMAT, | |
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2873 worker_id, _finger, finger); |
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2874 } |
342 | 2875 |
2876 // read it again | |
2877 finger = _finger; | |
2878 } | |
2879 } | |
2880 | |
2881 return NULL; | |
2882 } | |
2883 | |
4787
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2884 #ifndef PRODUCT |
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2885 enum VerifyNoCSetOopsPhase { |
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2886 VerifyNoCSetOopsStack, |
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2887 VerifyNoCSetOopsQueues, |
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2888 VerifyNoCSetOopsSATBCompleted, |
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2889 VerifyNoCSetOopsSATBThread |
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2890 }; |
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2891 |
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2892 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2893 private: |
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2894 G1CollectedHeap* _g1h; |
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2895 VerifyNoCSetOopsPhase _phase; |
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2896 int _info; |
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2897 |
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2898 const char* phase_str() { |
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2899 switch (_phase) { |
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2900 case VerifyNoCSetOopsStack: return "Stack"; |
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2901 case VerifyNoCSetOopsQueues: return "Queue"; |
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2902 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2903 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2904 default: ShouldNotReachHere(); |
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2905 } |
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2906 return NULL; |
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|
2907 } |
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2908 |
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2909 void do_object_work(oop obj) { |
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2910 guarantee(!_g1h->obj_in_cs(obj), |
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2911 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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2912 (void*) obj, phase_str(), _info)); |
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|
2913 } |
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|
2914 |
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|
2915 public: |
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2916 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2917 |
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2918 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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2919 _phase = phase; |
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2920 _info = info; |
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|
2921 } |
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|
2922 |
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|
2923 virtual void do_oop(oop* p) { |
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2924 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2925 do_object_work(obj); |
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|
2926 } |
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|
2927 |
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|
2928 virtual void do_oop(narrowOop* p) { |
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2929 // We should not come across narrow oops while scanning marking |
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|
2930 // stacks and SATB buffers. |
2ace1c4ee8da
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|
2931 ShouldNotReachHere(); |
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|
2932 } |
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|
2933 |
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|
2934 virtual void do_object(oop obj) { |
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|
2935 do_object_work(obj); |
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|
2936 } |
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|
2937 }; |
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|
2938 |
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|
2939 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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|
2940 bool verify_enqueued_buffers, |
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|
2941 bool verify_thread_buffers, |
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|
2942 bool verify_fingers) { |
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|
2943 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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|
2944 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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|
2945 return; |
342 | 2946 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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|
2947 |
4787
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2948 VerifyNoCSetOopsClosure cl; |
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|
2949 |
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|
2950 if (verify_stacks) { |
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|
2951 // Verify entries on the global mark stack |
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|
2952 cl.set_phase(VerifyNoCSetOopsStack); |
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|
2953 _markStack.oops_do(&cl); |
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|
2954 |
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|
2955 // Verify entries on the task queues |
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2956 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
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|
2957 cl.set_phase(VerifyNoCSetOopsQueues, i); |
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|
2958 CMTaskQueue* queue = _task_queues->queue(i); |
4787
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|
2959 queue->oops_do(&cl); |
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|
2960 } |
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|
2961 } |
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|
2962 |
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|
2963 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
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|
2964 |
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|
2965 // Verify entries on the enqueued SATB buffers |
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|
2966 if (verify_enqueued_buffers) { |
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|
2967 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
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|
2968 satb_qs.iterate_completed_buffers_read_only(&cl); |
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|
2969 } |
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4783
diff
changeset
|
2970 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2971 // 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
|
2972 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2973 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2974 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
|
2975 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2976 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2977 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2978 // Verify the global finger |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2979 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2980 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
|
2981 // 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
|
2982 // 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
|
2983 // 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
|
2984 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2985 // 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
|
2986 // 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
|
2987 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2988 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
|
2989 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2990 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
|
2991 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2992 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2993 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2994 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2995 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
|
2996 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
|
2997 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2998 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2999 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
|
3000 // 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
|
3001 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
|
3002 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3003 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3004 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
|
3005 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3006 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3007 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3008 } |
342 | 3009 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3010 #endif // PRODUCT |
342 | 3011 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3012 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3013 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3014 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3015 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3016 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3017 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3018 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3019 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3020 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3021 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3022 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3023 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3024 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3025 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3026 _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
|
3027 _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
|
3028 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3029 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3030 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3031 // 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
|
3032 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3033 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3034 // "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
|
3035 // 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
|
3036 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3037 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3038 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3039 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3040 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3041 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3042 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3043 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3044 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3045 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
|
3046 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3047 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3049 start, limit, hr->top(), hr->end())); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3050 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3051 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3052 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3054 // 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
|
3055 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3056 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3057 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3058 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3059 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
|
3060 // '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
|
3061 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
|
3062 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3063 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
|
3064 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
|
3065 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
|
3066 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3067 // 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
|
3068 // 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
|
3069 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3070 // 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
|
3071 // 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
|
3072 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3073 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3074 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
|
3075 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3076 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3077 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3078 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3079 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3080 // 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
|
3081 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3082 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3083 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3084 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
|
3085 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
|
3086 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
|
3087 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3088 // 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
|
3089 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3090 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3091 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3092 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3093 // into the global card bitmap. |
d30fa85f9994
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|
3094 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
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|
3095 |
d30fa85f9994
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parents:
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diff
changeset
|
3096 while (scan_idx < limit_idx) { |
d30fa85f9994
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|
3097 assert(task_card_bm->at(scan_idx) == true, "should be"); |
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|
3098 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
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diff
changeset
|
3099 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
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|
3100 |
d30fa85f9994
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diff
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|
3101 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
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diff
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|
3102 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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parents:
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diff
changeset
|
3103 // parameter. It does, however, have an early exit if |
4836
d30fa85f9994
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|
3104 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
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diff
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|
3105 // passed in for left offset here. |
d30fa85f9994
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|
3106 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
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|
3107 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
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|
3108 } |
d30fa85f9994
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diff
changeset
|
3109 } |
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diff
changeset
|
3110 |
d30fa85f9994
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diff
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|
3111 // Update the marked bytes for this region. |
d30fa85f9994
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|
3112 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
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diff
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|
3113 |
d30fa85f9994
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diff
changeset
|
3114 // Next heap region |
d30fa85f9994
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diff
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|
3115 return false; |
d30fa85f9994
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diff
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|
3116 } |
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|
3117 }; |
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|
3118 |
d30fa85f9994
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|
3119 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
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|
3120 protected: |
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|
3121 G1CollectedHeap* _g1h; |
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|
3122 ConcurrentMark* _cm; |
d30fa85f9994
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|
3123 BitMap* _cm_card_bm; |
6862
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|
3124 uint _max_worker_id; |
4836
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|
3125 int _active_workers; |
d30fa85f9994
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|
3126 |
d30fa85f9994
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diff
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|
3127 public: |
d30fa85f9994
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|
3128 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
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|
3129 ConcurrentMark* cm, |
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|
3130 BitMap* cm_card_bm, |
6862
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|
3131 uint max_worker_id, |
4836
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|
3132 int n_workers) : |
d30fa85f9994
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|
3133 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
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|
3134 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
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|
3135 _max_worker_id(max_worker_id), |
4836
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|
3136 _active_workers(n_workers) { } |
d30fa85f9994
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|
3137 |
d30fa85f9994
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diff
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|
3138 void work(uint worker_id) { |
6862
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johnc
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|
3139 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
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|
3140 |
d30fa85f9994
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diff
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|
3141 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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|
3142 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
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|
3143 _active_workers, |
d30fa85f9994
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diff
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|
3144 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
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diff
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|
3145 } else { |
d30fa85f9994
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|
3146 _g1h->heap_region_iterate(&cl); |
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diff
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|
3147 } |
d30fa85f9994
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parents:
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diff
changeset
|
3148 } |
d30fa85f9994
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parents:
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diff
changeset
|
3149 }; |
d30fa85f9994
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diff
changeset
|
3150 |
d30fa85f9994
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diff
changeset
|
3151 |
d30fa85f9994
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diff
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|
3152 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
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diff
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|
3153 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
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|
3154 _g1h->workers()->active_workers() : |
d30fa85f9994
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parents:
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diff
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|
3155 1); |
d30fa85f9994
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diff
changeset
|
3156 |
d30fa85f9994
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parents:
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diff
changeset
|
3157 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
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|
3158 _max_worker_id, n_workers); |
4836
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diff
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|
3159 |
d30fa85f9994
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diff
changeset
|
3160 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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parents:
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diff
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|
3161 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
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parents:
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diff
changeset
|
3162 "sanity check"); |
d30fa85f9994
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diff
changeset
|
3163 _g1h->set_par_threads(n_workers); |
d30fa85f9994
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diff
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|
3164 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
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|
3165 _g1h->set_par_threads(0); |
d30fa85f9994
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diff
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|
3166 |
d30fa85f9994
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diff
changeset
|
3167 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
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parents:
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diff
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|
3168 "sanity check"); |
d30fa85f9994
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parents:
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diff
changeset
|
3169 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
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diff
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|
3170 } else { |
d30fa85f9994
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diff
changeset
|
3171 g1_par_agg_task.work(0); |
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diff
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|
3172 } |
d30fa85f9994
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diff
changeset
|
3173 } |
d30fa85f9994
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diff
changeset
|
3174 |
d30fa85f9994
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diff
changeset
|
3175 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
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|
3176 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
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diff
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|
3177 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
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diff
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|
3178 // liveness count aggregation (during remark) and the |
d30fa85f9994
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diff
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|
3179 // final counting task. |
d30fa85f9994
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diff
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|
3180 _card_bm.clear(); |
d30fa85f9994
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diff
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|
3181 |
d30fa85f9994
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diff
changeset
|
3182 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
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diff
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|
3183 // of the final counting task. |
d30fa85f9994
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diff
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|
3184 _region_bm.clear(); |
d30fa85f9994
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diff
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|
3185 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
3186 uint max_regions = _g1h->max_regions(); |
6862
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|
3187 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
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diff
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|
3188 |
8a5ea0a9ccc4
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johnc
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diff
changeset
|
3189 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
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|
3190 BitMap* task_card_bm = count_card_bitmap_for(i); |
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|
3191 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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|
3192 |
d30fa85f9994
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diff
changeset
|
3193 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
d30fa85f9994
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|
3194 assert(marked_bytes_array != NULL, "uninitialized"); |
d30fa85f9994
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|
3195 |
6010
720b6a76dd9d
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6008
diff
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|
3196 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
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|
3197 task_card_bm->clear(); |
d30fa85f9994
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|
3198 } |
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|
3199 } |
d30fa85f9994
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diff
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|
3200 |
342 | 3201 void ConcurrentMark::print_stats() { |
3202 if (verbose_stats()) { | |
3203 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3204 for (size_t i = 0; i < _active_tasks; ++i) { | |
3205 _tasks[i]->print_stats(); | |
3206 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3207 } | |
3208 } | |
3209 } | |
3210 | |
3211 // abandon current marking iteration due to a Full GC | |
3212 void ConcurrentMark::abort() { | |
3213 // Clear all marks to force marking thread to do nothing | |
3214 _nextMarkBitMap->clearAll(); | |
4836
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|
3215 // Clear the liveness counting data |
d30fa85f9994
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|
3216 clear_all_count_data(); |
342 | 3217 // Empty mark stack |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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7397
diff
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|
3218 reset_marking_state(); |
6862
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|
3219 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3220 _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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|
3221 } |
342 | 3222 _has_aborted = true; |
3223 | |
3224 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3225 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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|
3226 // 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
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diff
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|
3227 // 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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|
3228 satb_mq_set.set_active_all_threads( |
d4197f8d516a
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1314
diff
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|
3229 false, /* new active value */ |
d4197f8d516a
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1314
diff
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|
3230 satb_mq_set.is_active() /* expected_active */); |
342 | 3231 } |
3232 | |
3233 static void print_ms_time_info(const char* prefix, const char* name, | |
3234 NumberSeq& ns) { | |
3235 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3236 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3237 if (ns.num() > 0) { | |
3238 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3239 prefix, ns.sd(), ns.maximum()); | |
3240 } | |
3241 } | |
3242 | |
3243 void ConcurrentMark::print_summary_info() { | |
3244 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3245 print_ms_time_info(" ", "init marks", _init_times); | |
3246 print_ms_time_info(" ", "remarks", _remark_times); | |
3247 { | |
3248 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3249 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3250 | |
3251 } | |
3252 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3253 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3254 _total_counting_time, | |
3255 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3256 (double)_cleanup_times.num() | |
3257 : 0.0)); | |
3258 if (G1ScrubRemSets) { | |
3259 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3260 _total_rs_scrub_time, | |
3261 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3262 (double)_cleanup_times.num() | |
3263 : 0.0)); | |
3264 } | |
3265 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3266 (_init_times.sum() + _remark_times.sum() + | |
3267 _cleanup_times.sum())/1000.0); | |
3268 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3269 "(%8.2f s marking).", |
342 | 3270 cmThread()->vtime_accum(), |
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3271 cmThread()->vtime_mark_accum()); |
342 | 3272 } |
3273 | |
1019 | 3274 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
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3275 if (use_parallel_marking_threads()) { |
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3276 _parallel_workers->print_worker_threads_on(st); |
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3277 } |
1019 | 3278 } |
3279 | |
342 | 3280 // We take a break if someone is trying to stop the world. |
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3281 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3282 if (should_yield()) { |
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3283 if (worker_id == 0) { |
342 | 3284 _g1h->g1_policy()->record_concurrent_pause(); |
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3285 } |
342 | 3286 cmThread()->yield(); |
3287 return true; | |
3288 } else { | |
3289 return false; | |
3290 } | |
3291 } | |
3292 | |
3293 bool ConcurrentMark::should_yield() { | |
3294 return cmThread()->should_yield(); | |
3295 } | |
3296 | |
3297 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3298 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3299 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3300 } | |
3301 | |
3302 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3303 void* last) { | |
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3304 return containing_card_is_marked(start) && |
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3305 containing_card_is_marked(last); |
342 | 3306 } |
3307 | |
3308 #ifndef PRODUCT | |
3309 // for debugging purposes | |
3310 void ConcurrentMark::print_finger() { | |
3311 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3312 _heap_start, _heap_end, _finger); | |
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3313 for (uint i = 0; i < _max_worker_id; ++i) { |
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3314 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
342 | 3315 } |
3316 gclog_or_tty->print_cr(""); | |
3317 } | |
3318 #endif | |
3319 | |
3771 | 3320 void CMTask::scan_object(oop obj) { |
3321 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3322 | |
3323 if (_cm->verbose_high()) { | |
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3324 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
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3325 _worker_id, (void*) obj); |
3771 | 3326 } |
3327 | |
3328 size_t obj_size = obj->size(); | |
3329 _words_scanned += obj_size; | |
3330 | |
3331 obj->oop_iterate(_cm_oop_closure); | |
3332 statsOnly( ++_objs_scanned ); | |
3333 check_limits(); | |
3334 } | |
3335 | |
342 | 3336 // Closure for iteration over bitmaps |
3337 class CMBitMapClosure : public BitMapClosure { | |
3338 private: | |
3339 // the bitmap that is being iterated over | |
3340 CMBitMap* _nextMarkBitMap; | |
3341 ConcurrentMark* _cm; | |
3342 CMTask* _task; | |
3343 | |
3344 public: | |
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3345 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3346 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3347 |
3348 bool do_bit(size_t offset) { | |
3349 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3350 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3351 assert( addr < _cm->finger(), "invariant"); |
342 | 3352 |
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3353 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3354 assert(addr >= _task->finger(), "invariant"); |
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3355 |
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3356 // We move that task's local finger along. |
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3357 _task->move_finger_to(addr); |
342 | 3358 |
3359 _task->scan_object(oop(addr)); | |
3360 // we only partially drain the local queue and global stack | |
3361 _task->drain_local_queue(true); | |
3362 _task->drain_global_stack(true); | |
3363 | |
3364 // if the has_aborted flag has been raised, we need to bail out of | |
3365 // the iteration | |
3366 return !_task->has_aborted(); | |
3367 } | |
3368 }; | |
3369 | |
3370 // Closure for iterating over objects, currently only used for | |
3371 // processing SATB buffers. | |
3372 class CMObjectClosure : public ObjectClosure { | |
3373 private: | |
3374 CMTask* _task; | |
3375 | |
3376 public: | |
3377 void do_object(oop obj) { | |
3378 _task->deal_with_reference(obj); | |
3379 } | |
3380 | |
3381 CMObjectClosure(CMTask* task) : _task(task) { } | |
3382 }; | |
3383 | |
3771 | 3384 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3385 ConcurrentMark* cm, | |
3386 CMTask* task) | |
3387 : _g1h(g1h), _cm(cm), _task(task) { | |
3388 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3389 | |
3390 if (G1UseConcMarkReferenceProcessing) { | |
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3391 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3392 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3393 } |
3771 | 3394 } |
342 | 3395 |
3396 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3397 // Separated the asserts so that we know which one fires. |
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3398 assert(hr != NULL, |
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3399 "claim_region() should have filtered out continues humongous regions"); |
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3400 assert(!hr->continuesHumongous(), |
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3401 "claim_region() should have filtered out continues humongous regions"); |
342 | 3402 |
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3403 if (_cm->verbose_low()) { |
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3404 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3405 _worker_id, hr); |
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3406 } |
342 | 3407 |
3408 _curr_region = hr; | |
3409 _finger = hr->bottom(); | |
3410 update_region_limit(); | |
3411 } | |
3412 | |
3413 void CMTask::update_region_limit() { | |
3414 HeapRegion* hr = _curr_region; | |
3415 HeapWord* bottom = hr->bottom(); | |
3416 HeapWord* limit = hr->next_top_at_mark_start(); | |
3417 | |
3418 if (limit == bottom) { | |
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3419 if (_cm->verbose_low()) { |
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3420 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3421 "["PTR_FORMAT", "PTR_FORMAT")", |
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3422 _worker_id, bottom, limit); |
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3423 } |
342 | 3424 // The region was collected underneath our feet. |
3425 // We set the finger to bottom to ensure that the bitmap | |
3426 // iteration that will follow this will not do anything. | |
3427 // (this is not a condition that holds when we set the region up, | |
3428 // as the region is not supposed to be empty in the first place) | |
3429 _finger = bottom; | |
3430 } else if (limit >= _region_limit) { | |
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3431 assert(limit >= _finger, "peace of mind"); |
342 | 3432 } else { |
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3433 assert(limit < _region_limit, "only way to get here"); |
342 | 3434 // This can happen under some pretty unusual circumstances. An |
3435 // evacuation pause empties the region underneath our feet (NTAMS | |
3436 // at bottom). We then do some allocation in the region (NTAMS | |
3437 // stays at bottom), followed by the region being used as a GC | |
3438 // alloc region (NTAMS will move to top() and the objects | |
3439 // originally below it will be grayed). All objects now marked in | |
3440 // the region are explicitly grayed, if below the global finger, | |
3441 // and we do not need in fact to scan anything else. So, we simply | |
3442 // set _finger to be limit to ensure that the bitmap iteration | |
3443 // doesn't do anything. | |
3444 _finger = limit; | |
3445 } | |
3446 | |
3447 _region_limit = limit; | |
3448 } | |
3449 | |
3450 void CMTask::giveup_current_region() { | |
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3451 assert(_curr_region != NULL, "invariant"); |
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3452 if (_cm->verbose_low()) { |
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3453 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3454 _worker_id, _curr_region); |
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3455 } |
342 | 3456 clear_region_fields(); |
3457 } | |
3458 | |
3459 void CMTask::clear_region_fields() { | |
3460 // Values for these three fields that indicate that we're not | |
3461 // holding on to a region. | |
3462 _curr_region = NULL; | |
3463 _finger = NULL; | |
3464 _region_limit = NULL; | |
3465 } | |
3466 | |
3771 | 3467 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3468 if (cm_oop_closure == NULL) { | |
3469 assert(_cm_oop_closure != NULL, "invariant"); | |
3470 } else { | |
3471 assert(_cm_oop_closure == NULL, "invariant"); | |
3472 } | |
3473 _cm_oop_closure = cm_oop_closure; | |
3474 } | |
3475 | |
342 | 3476 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3477 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3478 |
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3479 if (_cm->verbose_low()) { |
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3480 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3481 } |
342 | 3482 |
3483 _nextMarkBitMap = nextMarkBitMap; | |
3484 clear_region_fields(); | |
3485 | |
3486 _calls = 0; | |
3487 _elapsed_time_ms = 0.0; | |
3488 _termination_time_ms = 0.0; | |
3489 _termination_start_time_ms = 0.0; | |
3490 | |
3491 #if _MARKING_STATS_ | |
3492 _local_pushes = 0; | |
3493 _local_pops = 0; | |
3494 _local_max_size = 0; | |
3495 _objs_scanned = 0; | |
3496 _global_pushes = 0; | |
3497 _global_pops = 0; | |
3498 _global_max_size = 0; | |
3499 _global_transfers_to = 0; | |
3500 _global_transfers_from = 0; | |
3501 _regions_claimed = 0; | |
3502 _objs_found_on_bitmap = 0; | |
3503 _satb_buffers_processed = 0; | |
3504 _steal_attempts = 0; | |
3505 _steals = 0; | |
3506 _aborted = 0; | |
3507 _aborted_overflow = 0; | |
3508 _aborted_cm_aborted = 0; | |
3509 _aborted_yield = 0; | |
3510 _aborted_timed_out = 0; | |
3511 _aborted_satb = 0; | |
3512 _aborted_termination = 0; | |
3513 #endif // _MARKING_STATS_ | |
3514 } | |
3515 | |
3516 bool CMTask::should_exit_termination() { | |
3517 regular_clock_call(); | |
3518 // This is called when we are in the termination protocol. We should | |
3519 // quit if, for some reason, this task wants to abort or the global | |
3520 // stack is not empty (this means that we can get work from it). | |
3521 return !_cm->mark_stack_empty() || has_aborted(); | |
3522 } | |
3523 | |
3524 void CMTask::reached_limit() { | |
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3525 assert(_words_scanned >= _words_scanned_limit || |
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3526 _refs_reached >= _refs_reached_limit , |
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3527 "shouldn't have been called otherwise"); |
342 | 3528 regular_clock_call(); |
3529 } | |
3530 | |
3531 void CMTask::regular_clock_call() { | |
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3532 if (has_aborted()) return; |
342 | 3533 |
3534 // First, we need to recalculate the words scanned and refs reached | |
3535 // limits for the next clock call. | |
3536 recalculate_limits(); | |
3537 | |
3538 // During the regular clock call we do the following | |
3539 | |
3540 // (1) If an overflow has been flagged, then we abort. | |
3541 if (_cm->has_overflown()) { | |
3542 set_has_aborted(); | |
3543 return; | |
3544 } | |
3545 | |
3546 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3547 // to check anything else. The other steps are only needed during | |
3548 // the concurrent marking phase. | |
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3549 if (!concurrent()) return; |
342 | 3550 |
3551 // (2) If marking has been aborted for Full GC, then we also abort. | |
3552 if (_cm->has_aborted()) { | |
3553 set_has_aborted(); | |
3554 statsOnly( ++_aborted_cm_aborted ); | |
3555 return; | |
3556 } | |
3557 | |
3558 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3559 | |
3560 // (3) If marking stats are enabled, then we update the step history. | |
3561 #if _MARKING_STATS_ | |
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3562 if (_words_scanned >= _words_scanned_limit) { |
342 | 3563 ++_clock_due_to_scanning; |
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3564 } |
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3565 if (_refs_reached >= _refs_reached_limit) { |
342 | 3566 ++_clock_due_to_marking; |
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3567 } |
342 | 3568 |
3569 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3570 _interval_start_time_ms = curr_time_ms; | |
3571 _all_clock_intervals_ms.add(last_interval_ms); | |
3572 | |
3573 if (_cm->verbose_medium()) { | |
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3574 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
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3575 "scanned = %d%s, refs reached = %d%s", |
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3576 _worker_id, last_interval_ms, |
3776
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3577 _words_scanned, |
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3578 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3579 _refs_reached, |
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3580 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3581 } |
3582 #endif // _MARKING_STATS_ | |
3583 | |
3584 // (4) We check whether we should yield. If we have to, then we abort. | |
3585 if (_cm->should_yield()) { | |
3586 // We should yield. To do this we abort the task. The caller is | |
3587 // responsible for yielding. | |
3588 set_has_aborted(); | |
3589 statsOnly( ++_aborted_yield ); | |
3590 return; | |
3591 } | |
3592 | |
3593 // (5) We check whether we've reached our time quota. If we have, | |
3594 // then we abort. | |
3595 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3596 if (elapsed_time_ms > _time_target_ms) { | |
3597 set_has_aborted(); | |
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3598 _has_timed_out = true; |
342 | 3599 statsOnly( ++_aborted_timed_out ); |
3600 return; | |
3601 } | |
3602 | |
3603 // (6) Finally, we check whether there are enough completed STAB | |
3604 // buffers available for processing. If there are, we abort. | |
3605 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3606 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3776
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3607 if (_cm->verbose_low()) { |
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3608 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3609 _worker_id); |
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3610 } |
342 | 3611 // we do need to process SATB buffers, we'll abort and restart |
3612 // the marking task to do so | |
3613 set_has_aborted(); | |
3614 statsOnly( ++_aborted_satb ); | |
3615 return; | |
3616 } | |
3617 } | |
3618 | |
3619 void CMTask::recalculate_limits() { | |
3620 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3621 _words_scanned_limit = _real_words_scanned_limit; | |
3622 | |
3623 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3624 _refs_reached_limit = _real_refs_reached_limit; | |
3625 } | |
3626 | |
3627 void CMTask::decrease_limits() { | |
3628 // This is called when we believe that we're going to do an infrequent | |
3629 // operation which will increase the per byte scanned cost (i.e. move | |
3630 // entries to/from the global stack). It basically tries to decrease the | |
3631 // scanning limit so that the clock is called earlier. | |
3632 | |
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3633 if (_cm->verbose_medium()) { |
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3634 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3635 } |
342 | 3636 |
3637 _words_scanned_limit = _real_words_scanned_limit - | |
3638 3 * words_scanned_period / 4; | |
3639 _refs_reached_limit = _real_refs_reached_limit - | |
3640 3 * refs_reached_period / 4; | |
3641 } | |
3642 | |
3643 void CMTask::move_entries_to_global_stack() { | |
3644 // local array where we'll store the entries that will be popped | |
3645 // from the local queue | |
3646 oop buffer[global_stack_transfer_size]; | |
3647 | |
3648 int n = 0; | |
3649 oop obj; | |
3650 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3651 buffer[n] = obj; | |
3652 ++n; | |
3653 } | |
3654 | |
3655 if (n > 0) { | |
3656 // we popped at least one entry from the local queue | |
3657 | |
3658 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3659 | |
3660 if (!_cm->mark_stack_push(buffer, n)) { | |
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3661 if (_cm->verbose_low()) { |
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3662 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3663 _worker_id); |
3776
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3664 } |
342 | 3665 set_has_aborted(); |
3666 } else { | |
3667 // the transfer was successful | |
3668 | |
3776
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3669 if (_cm->verbose_medium()) { |
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3670 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3671 _worker_id, n); |
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3672 } |
342 | 3673 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3674 if (tmp_size > _global_max_size) { |
342 | 3675 _global_max_size = tmp_size; |
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3676 } |
342 | 3677 _global_pushes += n ); |
3678 } | |
3679 } | |
3680 | |
3681 // this operation was quite expensive, so decrease the limits | |
3682 decrease_limits(); | |
3683 } | |
3684 | |
3685 void CMTask::get_entries_from_global_stack() { | |
3686 // local array where we'll store the entries that will be popped | |
3687 // from the global stack. | |
3688 oop buffer[global_stack_transfer_size]; | |
3689 int n; | |
3690 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3691 assert(n <= global_stack_transfer_size, |
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3692 "we should not pop more than the given limit"); |
342 | 3693 if (n > 0) { |
3694 // yes, we did actually pop at least one entry | |
3695 | |
3696 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3697 if (_cm->verbose_medium()) { |
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3698 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3699 _worker_id, n); |
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3700 } |
342 | 3701 for (int i = 0; i < n; ++i) { |
3702 bool success = _task_queue->push(buffer[i]); | |
3703 // We only call this when the local queue is empty or under a | |
3704 // given target limit. So, we do not expect this push to fail. | |
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3705 assert(success, "invariant"); |
342 | 3706 } |
3707 | |
3708 statsOnly( int tmp_size = _task_queue->size(); | |
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3709 if (tmp_size > _local_max_size) { |
342 | 3710 _local_max_size = tmp_size; |
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3711 } |
342 | 3712 _local_pushes += n ); |
3713 } | |
3714 | |
3715 // this operation was quite expensive, so decrease the limits | |
3716 decrease_limits(); | |
3717 } | |
3718 | |
3719 void CMTask::drain_local_queue(bool partially) { | |
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3720 if (has_aborted()) return; |
342 | 3721 |
3722 // Decide what the target size is, depending whether we're going to | |
3723 // drain it partially (so that other tasks can steal if they run out | |
3724 // of things to do) or totally (at the very end). | |
3725 size_t target_size; | |
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3726 if (partially) { |
342 | 3727 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3728 } else { |
342 | 3729 target_size = 0; |
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3730 } |
342 | 3731 |
3732 if (_task_queue->size() > target_size) { | |
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3733 if (_cm->verbose_high()) { |
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3734 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
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3735 _worker_id, target_size); |
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3736 } |
342 | 3737 |
3738 oop obj; | |
3739 bool ret = _task_queue->pop_local(obj); | |
3740 while (ret) { | |
3741 statsOnly( ++_local_pops ); | |
3742 | |
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3743 if (_cm->verbose_high()) { |
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3744 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
342 | 3745 (void*) obj); |
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3746 } |
342 | 3747 |
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3748 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3749 assert(!_g1h->is_on_master_free_list( |
2152 | 3750 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3751 |
3752 scan_object(obj); | |
3753 | |
3776
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3754 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3755 ret = false; |
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3756 } else { |
342 | 3757 ret = _task_queue->pop_local(obj); |
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3758 } |
342 | 3759 } |
3760 | |
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3761 if (_cm->verbose_high()) { |
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3762 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3763 _worker_id, _task_queue->size()); |
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3764 } |
342 | 3765 } |
3766 } | |
3767 | |
3768 void CMTask::drain_global_stack(bool partially) { | |
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3769 if (has_aborted()) return; |
342 | 3770 |
3771 // We have a policy to drain the local queue before we attempt to | |
3772 // drain the global stack. | |
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3773 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3774 |
3775 // Decide what the target size is, depending whether we're going to | |
3776 // drain it partially (so that other tasks can steal if they run out | |
3777 // of things to do) or totally (at the very end). Notice that, | |
3778 // because we move entries from the global stack in chunks or | |
3779 // because another task might be doing the same, we might in fact | |
3780 // drop below the target. But, this is not a problem. | |
3781 size_t target_size; | |
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3782 if (partially) { |
342 | 3783 target_size = _cm->partial_mark_stack_size_target(); |
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3784 } else { |
342 | 3785 target_size = 0; |
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3786 } |
342 | 3787 |
3788 if (_cm->mark_stack_size() > target_size) { | |
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3789 if (_cm->verbose_low()) { |
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3790 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
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3791 _worker_id, target_size); |
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3792 } |
342 | 3793 |
3794 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3795 get_entries_from_global_stack(); | |
3796 drain_local_queue(partially); | |
3797 } | |
3798 | |
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3799 if (_cm->verbose_low()) { |
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3800 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
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3801 _worker_id, _cm->mark_stack_size()); |
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3802 } |
342 | 3803 } |
3804 } | |
3805 | |
3806 // SATB Queue has several assumptions on whether to call the par or | |
3807 // non-par versions of the methods. this is why some of the code is | |
3808 // replicated. We should really get rid of the single-threaded version | |
3809 // of the code to simplify things. | |
3810 void CMTask::drain_satb_buffers() { | |
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3811 if (has_aborted()) return; |
342 | 3812 |
3813 // We set this so that the regular clock knows that we're in the | |
3814 // middle of draining buffers and doesn't set the abort flag when it | |
3815 // notices that SATB buffers are available for draining. It'd be | |
3816 // very counter productive if it did that. :-) | |
3817 _draining_satb_buffers = true; | |
3818 | |
3819 CMObjectClosure oc(this); | |
3820 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3821 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3822 satb_mq_set.set_par_closure(_worker_id, &oc); |
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3823 } else { |
342 | 3824 satb_mq_set.set_closure(&oc); |
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3825 } |
342 | 3826 |
3827 // This keeps claiming and applying the closure to completed buffers | |
3828 // until we run out of buffers or we need to abort. | |
1833
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3829 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3830 while (!has_aborted() && |
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3831 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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3832 if (_cm->verbose_medium()) { |
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3833 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3834 } |
342 | 3835 statsOnly( ++_satb_buffers_processed ); |
3836 regular_clock_call(); | |
3837 } | |
3838 } else { | |
3839 while (!has_aborted() && | |
3840 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3841 if (_cm->verbose_medium()) { |
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3842 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3843 } |
342 | 3844 statsOnly( ++_satb_buffers_processed ); |
3845 regular_clock_call(); | |
3846 } | |
3847 } | |
3848 | |
3849 if (!concurrent() && !has_aborted()) { | |
3850 // We should only do this during remark. | |
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3851 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3852 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
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3853 } else { |
342 | 3854 satb_mq_set.iterate_closure_all_threads(); |
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3855 } |
342 | 3856 } |
3857 | |
3858 _draining_satb_buffers = false; | |
3859 | |
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3860 assert(has_aborted() || |
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3861 concurrent() || |
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3862 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3863 |
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3864 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3865 satb_mq_set.set_par_closure(_worker_id, NULL); |
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3866 } else { |
342 | 3867 satb_mq_set.set_closure(NULL); |
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3868 } |
342 | 3869 |
3870 // again, this was a potentially expensive operation, decrease the | |
3871 // limits to get the regular clock call early | |
3872 decrease_limits(); | |
3873 } | |
3874 | |
3875 void CMTask::print_stats() { | |
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3876 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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3877 _worker_id, _calls); |
342 | 3878 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
3879 _elapsed_time_ms, _termination_time_ms); | |
3880 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3881 _step_times_ms.num(), _step_times_ms.avg(), | |
3882 _step_times_ms.sd()); | |
3883 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3884 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3885 | |
3886 #if _MARKING_STATS_ | |
3887 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3888 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3889 _all_clock_intervals_ms.sd()); | |
3890 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3891 _all_clock_intervals_ms.maximum(), | |
3892 _all_clock_intervals_ms.sum()); | |
3893 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3894 _clock_due_to_scanning, _clock_due_to_marking); | |
3895 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3896 _objs_scanned, _objs_found_on_bitmap); | |
3897 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3898 _local_pushes, _local_pops, _local_max_size); | |
3899 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3900 _global_pushes, _global_pops, _global_max_size); | |
3901 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3902 _global_transfers_to,_global_transfers_from); | |
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3903 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3904 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3905 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3906 _steal_attempts, _steals); | |
3907 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3908 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3909 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3910 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3911 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3912 #endif // _MARKING_STATS_ | |
3913 } | |
3914 | |
3915 /***************************************************************************** | |
3916 | |
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3917 The do_marking_step(time_target_ms, ...) method is the building |
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3918 block of the parallel marking framework. It can be called in parallel |
342 | 3919 with other invocations of do_marking_step() on different tasks |
3920 (but only one per task, obviously) and concurrently with the | |
3921 mutator threads, or during remark, hence it eliminates the need | |
3922 for two versions of the code. When called during remark, it will | |
3923 pick up from where the task left off during the concurrent marking | |
3924 phase. Interestingly, tasks are also claimable during evacuation | |
3925 pauses too, since do_marking_step() ensures that it aborts before | |
3926 it needs to yield. | |
3927 | |
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3928 The data structures that it uses to do marking work are the |
342 | 3929 following: |
3930 | |
3931 (1) Marking Bitmap. If there are gray objects that appear only | |
3932 on the bitmap (this happens either when dealing with an overflow | |
3933 or when the initial marking phase has simply marked the roots | |
3934 and didn't push them on the stack), then tasks claim heap | |
3935 regions whose bitmap they then scan to find gray objects. A | |
3936 global finger indicates where the end of the last claimed region | |
3937 is. A local finger indicates how far into the region a task has | |
3938 scanned. The two fingers are used to determine how to gray an | |
3939 object (i.e. whether simply marking it is OK, as it will be | |
3940 visited by a task in the future, or whether it needs to be also | |
3941 pushed on a stack). | |
3942 | |
3943 (2) Local Queue. The local queue of the task which is accessed | |
3944 reasonably efficiently by the task. Other tasks can steal from | |
3945 it when they run out of work. Throughout the marking phase, a | |
3946 task attempts to keep its local queue short but not totally | |
3947 empty, so that entries are available for stealing by other | |
3948 tasks. Only when there is no more work, a task will totally | |
3949 drain its local queue. | |
3950 | |
3951 (3) Global Mark Stack. This handles local queue overflow. During | |
3952 marking only sets of entries are moved between it and the local | |
3953 queues, as access to it requires a mutex and more fine-grain | |
3954 interaction with it which might cause contention. If it | |
3955 overflows, then the marking phase should restart and iterate | |
3956 over the bitmap to identify gray objects. Throughout the marking | |
3957 phase, tasks attempt to keep the global mark stack at a small | |
3958 length but not totally empty, so that entries are available for | |
3959 popping by other tasks. Only when there is no more work, tasks | |
3960 will totally drain the global mark stack. | |
3961 | |
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3962 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 3963 made available. Buffers are regularly removed from this queue |
3964 and scanned for roots, so that the queue doesn't get too | |
3965 long. During remark, all completed buffers are processed, as | |
3966 well as the filled in parts of any uncompleted buffers. | |
3967 | |
3968 The do_marking_step() method tries to abort when the time target | |
3969 has been reached. There are a few other cases when the | |
3970 do_marking_step() method also aborts: | |
3971 | |
3972 (1) When the marking phase has been aborted (after a Full GC). | |
3973 | |
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3974 (2) When a global overflow (on the global stack) has been |
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3975 triggered. Before the task aborts, it will actually sync up with |
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3976 the other tasks to ensure that all the marking data structures |
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3977 (local queues, stacks, fingers etc.) are re-initialized so that |
5988
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3978 when do_marking_step() completes, the marking phase can |
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3979 immediately restart. |
342 | 3980 |
3981 (3) When enough completed SATB buffers are available. The | |
3982 do_marking_step() method only tries to drain SATB buffers right | |
3983 at the beginning. So, if enough buffers are available, the | |
3984 marking step aborts and the SATB buffers are processed at | |
3985 the beginning of the next invocation. | |
3986 | |
3987 (4) To yield. when we have to yield then we abort and yield | |
3988 right at the end of do_marking_step(). This saves us from a lot | |
3989 of hassle as, by yielding we might allow a Full GC. If this | |
3990 happens then objects will be compacted underneath our feet, the | |
3991 heap might shrink, etc. We save checking for this by just | |
3992 aborting and doing the yield right at the end. | |
3993 | |
3994 From the above it follows that the do_marking_step() method should | |
3995 be called in a loop (or, otherwise, regularly) until it completes. | |
3996 | |
3997 If a marking step completes without its has_aborted() flag being | |
3998 true, it means it has completed the current marking phase (and | |
3999 also all other marking tasks have done so and have all synced up). | |
4000 | |
4001 A method called regular_clock_call() is invoked "regularly" (in | |
4002 sub ms intervals) throughout marking. It is this clock method that | |
4003 checks all the abort conditions which were mentioned above and | |
4004 decides when the task should abort. A work-based scheme is used to | |
4005 trigger this clock method: when the number of object words the | |
4006 marking phase has scanned or the number of references the marking | |
4007 phase has visited reach a given limit. Additional invocations to | |
4008 the method clock have been planted in a few other strategic places | |
4009 too. The initial reason for the clock method was to avoid calling | |
4010 vtime too regularly, as it is quite expensive. So, once it was in | |
4011 place, it was natural to piggy-back all the other conditions on it | |
4012 too and not constantly check them throughout the code. | |
4013 | |
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4014 If do_termination is true then do_marking_step will enter its |
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4015 termination protocol. |
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4016 |
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4017 The value of is_serial must be true when do_marking_step is being |
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4018 called serially (i.e. by the VMThread) and do_marking_step should |
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4019 skip any synchronization in the termination and overflow code. |
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4020 Examples include the serial remark code and the serial reference |
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4021 processing closures. |
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4022 |
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4023 The value of is_serial must be false when do_marking_step is |
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4024 being called by any of the worker threads in a work gang. |
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4025 Examples include the concurrent marking code (CMMarkingTask), |
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4026 the MT remark code, and the MT reference processing closures. |
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4027 |
342 | 4028 *****************************************************************************/ |
4029 | |
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4030 void CMTask::do_marking_step(double time_target_ms, |
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4031 bool do_termination, |
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4032 bool is_serial) { |
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4033 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4034 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4035 |
342 | 4036 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
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4037 assert(_task_queues != NULL, "invariant"); |
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4038 assert(_task_queue != NULL, "invariant"); |
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4039 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4040 |
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4041 assert(!_claimed, |
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4042 "only one thread should claim this task at any one time"); |
342 | 4043 |
4044 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4045 // possible for two threads to set the _claimed flag at the same | |
4046 // time. But it is only for debugging purposes anyway and it will | |
4047 // catch most problems. | |
4048 _claimed = true; | |
4049 | |
4050 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4051 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4052 | |
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4053 // If do_stealing is true then do_marking_step will attempt to |
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4054 // steal work from the other CMTasks. It only makes sense to |
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4055 // enable stealing when the termination protocol is enabled |
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4056 // and do_marking_step() is not being called serially. |
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4057 bool do_stealing = do_termination && !is_serial; |
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4058 |
342 | 4059 double diff_prediction_ms = |
4060 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4061 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4062 | |
4063 // set up the variables that are used in the work-based scheme to | |
4064 // call the regular clock method | |
4065 _words_scanned = 0; | |
4066 _refs_reached = 0; | |
4067 recalculate_limits(); | |
4068 | |
4069 // clear all flags | |
4070 clear_has_aborted(); | |
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4071 _has_timed_out = false; |
342 | 4072 _draining_satb_buffers = false; |
4073 | |
4074 ++_calls; | |
4075 | |
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4076 if (_cm->verbose_low()) { |
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4077 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4078 "target = %1.2lfms >>>>>>>>>>", |
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4079 _worker_id, _calls, _time_target_ms); |
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4080 } |
342 | 4081 |
4082 // Set up the bitmap and oop closures. Anything that uses them is | |
4083 // eventually called from this method, so it is OK to allocate these | |
4084 // statically. | |
4085 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4086 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4087 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4088 |
4089 if (_cm->has_overflown()) { | |
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4090 // This can happen if the mark stack overflows during a GC pause |
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4091 // and this task, after a yield point, restarts. We have to abort |
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4092 // as we need to get into the overflow protocol which happens |
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4093 // right at the end of this task. |
342 | 4094 set_has_aborted(); |
4095 } | |
4096 | |
4097 // First drain any available SATB buffers. After this, we will not | |
4098 // look at SATB buffers before the next invocation of this method. | |
4099 // If enough completed SATB buffers are queued up, the regular clock | |
4100 // will abort this task so that it restarts. | |
4101 drain_satb_buffers(); | |
4102 // ...then partially drain the local queue and the global stack | |
4103 drain_local_queue(true); | |
4104 drain_global_stack(true); | |
4105 | |
4106 do { | |
4107 if (!has_aborted() && _curr_region != NULL) { | |
4108 // This means that we're already holding on to a region. | |
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4109 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4110 "should not be NULL either"); |
342 | 4111 |
4112 // We might have restarted this task after an evacuation pause | |
4113 // which might have evacuated the region we're holding on to | |
4114 // underneath our feet. Let's read its limit again to make sure | |
4115 // that we do not iterate over a region of the heap that | |
4116 // contains garbage (update_region_limit() will also move | |
4117 // _finger to the start of the region if it is found empty). | |
4118 update_region_limit(); | |
4119 // We will start from _finger not from the start of the region, | |
4120 // as we might be restarting this task after aborting half-way | |
4121 // through scanning this region. In this case, _finger points to | |
4122 // the address where we last found a marked object. If this is a | |
4123 // fresh region, _finger points to start(). | |
4124 MemRegion mr = MemRegion(_finger, _region_limit); | |
4125 | |
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4126 if (_cm->verbose_low()) { |
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|
4127 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4128 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4129 "of region "HR_FORMAT, |
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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|
4130 _worker_id, _finger, _region_limit, |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4131 HR_FORMAT_PARAMS(_curr_region)); |
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|
4132 } |
342 | 4133 |
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4134 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4135 "humongous regions should go around loop once only"); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4136 |
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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|
4137 // Some special cases: |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4138 // 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
johnc
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|
4139 // If the current region is humongous then we only need to check |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4140 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4141 // scan the object if it's live, and 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
johnc
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|
4142 // Otherwise, let's iterate over the bitmap of the part of 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
johnc
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|
4143 // that is left. |
8034
bce1ac447f6b
7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
johnc
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8014
diff
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|
4144 // 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
johnc
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|
4145 if (mr.is_empty()) { |
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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|
4146 giveup_current_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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|
4147 regular_clock_call(); |
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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|
4148 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4149 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
johnc
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|
4150 // The object is marked - apply the closure |
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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|
4151 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(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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|
4152 bitmap_closure.do_bit(offset); |
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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|
4153 } |
5e401ef52ec0
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|
4154 // Even if this task aborted while scanning the humongous object |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4155 // we can (and should) give up the current 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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|
4156 giveup_current_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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|
4157 regular_clock_call(); |
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 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4159 giveup_current_region(); |
4160 regular_clock_call(); | |
4161 } else { | |
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|
4162 assert(has_aborted(), "currently the only way to do so"); |
342 | 4163 // The only way to abort the bitmap iteration is to return |
4164 // false from the do_bit() method. However, inside the | |
4165 // do_bit() method we move the _finger to point to the | |
4166 // object currently being looked at. So, if we bail out, we | |
4167 // have definitely set _finger to something non-null. | |
1023
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|
4168 assert(_finger != NULL, "invariant"); |
342 | 4169 |
4170 // Region iteration was actually aborted. So now _finger | |
4171 // points to the address of the object we last scanned. If we | |
4172 // leave it there, when we restart this task, we will rescan | |
4173 // the object. It is easy to avoid this. We move the finger by | |
4174 // enough to point to the next possible object header (the | |
4175 // bitmap knows by how much we need to move it as it knows its | |
4176 // granularity). | |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4177 assert(_finger < _region_limit, "invariant"); |
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
tamao
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|
4178 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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diff
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|
4179 // 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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|
4180 if (new_finger >= _region_limit) { |
5988
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|
4181 giveup_current_region(); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
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|
4182 } else { |
5988
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7127697: G1: remove dead code after recent concurrent mark changes
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|
4183 move_finger_to(new_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4184 } |
342 | 4185 } |
4186 } | |
4187 // At this point we have either completed iterating over the | |
4188 // region we were holding on to, or we have aborted. | |
4189 | |
4190 // We then partially drain the local queue and the global stack. | |
4191 // (Do we really need this?) | |
4192 drain_local_queue(true); | |
4193 drain_global_stack(true); | |
4194 | |
4195 // Read the note on the claim_region() method on why it might | |
4196 // return NULL with potentially more regions available for | |
4197 // claiming and why we have to check out_of_regions() to determine | |
4198 // whether we're done or not. | |
4199 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4200 // We are going to try to claim a new region. We should have | |
4201 // given up on the previous one. | |
1023
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tonyp
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|
4202 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
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|
4203 assert(_curr_region == NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4204 assert(_finger == NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
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|
4205 assert(_region_limit == NULL, "invariant"); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4206 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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|
4207 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
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|
4208 } |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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diff
changeset
|
4209 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4210 if (claimed_region != NULL) { |
4211 // Yes, we managed to claim one | |
4212 statsOnly( ++_regions_claimed ); | |
4213 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
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changeset
|
4214 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
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changeset
|
4215 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4216 "region "PTR_FORMAT, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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|
4217 _worker_id, claimed_region); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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|
4218 } |
342 | 4219 |
4220 setup_for_region(claimed_region); | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
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|
4221 assert(_curr_region == claimed_region, "invariant"); |
342 | 4222 } |
4223 // It is important to call the regular clock here. It might take | |
4224 // a while to claim a region if, for example, we hit a large | |
4225 // block of empty regions. So we need to call the regular clock | |
4226 // method once round the loop to make sure it's called | |
4227 // frequently enough. | |
4228 regular_clock_call(); | |
4229 } | |
4230 | |
4231 if (!has_aborted() && _curr_region == NULL) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4232 assert(_cm->out_of_regions(), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4233 "at this point we should be out of regions"); |
342 | 4234 } |
4235 } while ( _curr_region != NULL && !has_aborted()); | |
4236 | |
4237 if (!has_aborted()) { | |
4238 // We cannot check whether the global stack is empty, since other | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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4837
diff
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|
4239 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4240 assert(_cm->out_of_regions(), |
11d4857fe5e1
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tonyp
parents:
1022
diff
changeset
|
4241 "at this point we should be out of regions"); |
342 | 4242 |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
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|
4243 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4244 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4245 } |
342 | 4246 |
4247 // Try to reduce the number of available SATB buffers so that | |
4248 // remark has less work to do. | |
4249 drain_satb_buffers(); | |
4250 } | |
4251 | |
4252 // Since we've done everything else, we can now totally drain the | |
4253 // local queue and global stack. | |
4254 drain_local_queue(false); | |
4255 drain_global_stack(false); | |
4256 | |
4257 // 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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|
4258 if (do_stealing && !has_aborted()) { |
342 | 4259 // We have not aborted. This means that we have finished all that |
4260 // we could. Let's try to do some stealing... | |
4261 | |
4262 // We cannot check whether the global stack is empty, since other | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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4837
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|
4263 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4264 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
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|
4265 "only way to reach here"); |
342 | 4266 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
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|
4267 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
4268 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
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|
4269 } |
342 | 4270 |
4271 while (!has_aborted()) { | |
4272 oop obj; | |
4273 statsOnly( ++_steal_attempts ); | |
4274 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
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|
4275 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
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|
4276 if (_cm->verbose_medium()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4277 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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|
4278 _worker_id, (void*) obj); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
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|
4279 } |
342 | 4280 |
4281 statsOnly( ++_steals ); | |
4282 | |
1023
11d4857fe5e1
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tonyp
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1022
diff
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|
4283 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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tonyp
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1022
diff
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|
4284 "any stolen object should be marked"); |
342 | 4285 scan_object(obj); |
4286 | |
4287 // And since we're towards the end, let's totally drain the | |
4288 // local queue and global stack. | |
4289 drain_local_queue(false); | |
4290 drain_global_stack(false); | |
4291 } else { | |
4292 break; | |
4293 } | |
4294 } | |
4295 } | |
4296 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4297 // 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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2436
diff
changeset
|
4298 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4299 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4300 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
|
4301 _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
|
4302 regular_clock_call(); |
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
|
4303 } |
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
|
4304 } |
cd8e33b2a8ad
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tonyp
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2436
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|
4305 |
342 | 4306 // We still haven't aborted. Now, let's try to get into the |
4307 // termination protocol. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4308 if (do_termination && !has_aborted()) { |
342 | 4309 // We cannot check whether the global stack is empty, since other |
5988
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|
4310 // tasks might be concurrently pushing objects on it. |
1023
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4311 // Separated the asserts so that we know which one fires. |
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|
4312 assert(_cm->out_of_regions(), "only way to reach here"); |
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|
4313 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4314 |
3776
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|
4315 if (_cm->verbose_low()) { |
6862
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|
4316 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
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|
4317 } |
342 | 4318 |
4319 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
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4320 |
342 | 4321 // The CMTask class also extends the TerminatorTerminator class, |
4322 // hence its should_exit_termination() method will also decide | |
4323 // whether to exit the termination protocol or not. | |
8787
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|
4324 bool finished = (is_serial || |
fa08949fe0cb
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|
4325 _cm->terminator()->offer_termination(this)); |
342 | 4326 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4327 _termination_time_ms += | |
4328 termination_end_time_ms - _termination_start_time_ms; | |
4329 | |
4330 if (finished) { | |
4331 // We're all done. | |
4332 | |
6862
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4333 if (_worker_id == 0) { |
342 | 4334 // let's allow task 0 to do this |
4335 if (concurrent()) { | |
1023
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|
4336 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4337 // we need to set this to false before the next |
4338 // safepoint. This way we ensure that the marking phase | |
4339 // doesn't observe any more heap expansions. | |
4340 _cm->clear_concurrent_marking_in_progress(); | |
4341 } | |
4342 } | |
4343 | |
4344 // We can now guarantee that the global stack is empty, since | |
1023
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|
4345 // all other tasks have finished. We separated the guarantees so |
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|
4346 // that, if a condition is false, we can immediately find out |
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|
4347 // which one. |
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|
4348 guarantee(_cm->out_of_regions(), "only way to reach here"); |
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|
4349 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
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|
4350 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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|
4351 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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4352 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4353 |
3776
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|
4354 if (_cm->verbose_low()) { |
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4355 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
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4356 } |
342 | 4357 } else { |
4358 // Apparently there's more work to do. Let's abort this task. It | |
4359 // will restart it and we can hopefully find more things to do. | |
4360 | |
3776
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|
4361 if (_cm->verbose_low()) { |
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4362 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
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|
4363 _worker_id); |
3776
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|
4364 } |
342 | 4365 |
4366 set_has_aborted(); | |
4367 statsOnly( ++_aborted_termination ); | |
4368 } | |
4369 } | |
4370 | |
4371 // Mainly for debugging purposes to make sure that a pointer to the | |
4372 // closure which was statically allocated in this frame doesn't | |
4373 // escape it by accident. | |
3771 | 4374 set_cm_oop_closure(NULL); |
342 | 4375 double end_time_ms = os::elapsedVTime() * 1000.0; |
4376 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4377 // Update the step history. | |
4378 _step_times_ms.add(elapsed_time_ms); | |
4379 | |
4380 if (has_aborted()) { | |
4381 // The task was aborted for some reason. | |
4382 | |
4383 statsOnly( ++_aborted ); | |
4384 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4385 if (_has_timed_out) { |
342 | 4386 double diff_ms = elapsed_time_ms - _time_target_ms; |
4387 // Keep statistics of how well we did with respect to hitting | |
4388 // our target only if we actually timed out (if we aborted for | |
4389 // other reasons, then the results might get skewed). | |
4390 _marking_step_diffs_ms.add(diff_ms); | |
4391 } | |
4392 | |
4393 if (_cm->has_overflown()) { | |
4394 // This is the interesting one. We aborted because a global | |
4395 // overflow was raised. This means we have to restart the | |
4396 // marking phase and start iterating over regions. However, in | |
4397 // order to do this we have to make sure that all tasks stop | |
4398 // what they are doing and re-initialise in a safe manner. We | |
4399 // will achieve this with the use of two barrier sync points. | |
4400 | |
3776
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|
4401 if (_cm->verbose_low()) { |
6862
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|
4402 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
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|
4403 } |
342 | 4404 |
8787
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|
4405 if (!is_serial) { |
fa08949fe0cb
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changeset
|
4406 // We only need to enter the sync barrier if being called |
fa08949fe0cb
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|
4407 // from a parallel context |
fa08949fe0cb
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|
4408 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
4409 |
fa08949fe0cb
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changeset
|
4410 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
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changeset
|
4411 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
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|
4412 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
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diff
changeset
|
4413 // task 0 will clear the global data structures. |
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changeset
|
4414 } |
342 | 4415 |
4416 statsOnly( ++_aborted_overflow ); | |
4417 | |
4418 // We clear the local state of this task... | |
4419 clear_region_fields(); | |
4420 | |
8787
fa08949fe0cb
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|
4421 if (!is_serial) { |
fa08949fe0cb
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changeset
|
4422 // ...and enter the second barrier. |
fa08949fe0cb
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changeset
|
4423 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
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changeset
|
4424 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
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diff
changeset
|
4425 // At this point, if we're during the concurrent phase of |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
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changeset
|
4426 // marking, everything has been re-initialized and we're |
342 | 4427 // ready to restart. |
4428 } | |
4429 | |
4430 if (_cm->verbose_low()) { | |
6862
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|
4431 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4432 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
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changeset
|
4433 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
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|
4434 if (_cm->has_aborted()) { |
6862
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parents:
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changeset
|
4435 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4436 _worker_id); |
3776
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|
4437 } |
342 | 4438 } |
4439 } else { | |
3776
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|
4440 if (_cm->verbose_low()) { |
6862
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changeset
|
4441 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4442 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
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changeset
|
4443 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
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|
4444 } |
342 | 4445 } |
4446 | |
4447 _claimed = false; | |
4448 } | |
4449 | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
4450 CMTask::CMTask(uint worker_id, |
342 | 4451 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4452 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4453 BitMap* card_bm, |
342 | 4454 CMTaskQueue* task_queue, |
4455 CMTaskQueueSet* task_queues) | |
4456 : _g1h(G1CollectedHeap::heap()), | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
changeset
|
4457 _worker_id(worker_id), _cm(cm), |
342 | 4458 _claimed(false), |
4459 _nextMarkBitMap(NULL), _hash_seed(17), | |
4460 _task_queue(task_queue), | |
4461 _task_queues(task_queues), | |
3771 | 4462 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4463 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
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|
4464 _card_bm(card_bm) { |
1023
11d4857fe5e1
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1022
diff
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|
4465 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
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diff
changeset
|
4466 guarantee(task_queues != NULL, "invariant"); |
342 | 4467 |
4468 statsOnly( _clock_due_to_scanning = 0; | |
4469 _clock_due_to_marking = 0 ); | |
4470 | |
4471 _marking_step_diffs_ms.add(0.5); | |
4472 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4473 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4474 // 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
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2369
diff
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|
4475 // 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
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diff
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|
4476 // 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
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2369
diff
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|
4477 // 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
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2369
diff
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|
4478 // 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
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diff
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|
4479 // easier to compose. |
371bbc844bf1
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|
4480 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4481 // All the output lines are prefixed with this string to be able to |
371bbc844bf1
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diff
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|
4482 // 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
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diff
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|
4483 #define G1PPRL_LINE_PREFIX "###" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4484 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4485 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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diff
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|
4486 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4487 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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|
4488 #else // _LP64 |
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|
4489 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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|
4490 #endif // _LP64 |
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|
4491 |
371bbc844bf1
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|
4492 // For per-region info |
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diff
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|
4493 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
4494 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
4495 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
371bbc844bf1
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|
4496 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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diff
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|
4497 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
371bbc844bf1
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|
4498 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4499 |
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diff
changeset
|
4500 // For summary info |
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diff
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|
4501 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4502 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4503 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4504 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4505 |
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changeset
|
4506 G1PrintRegionLivenessInfoClosure:: |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4507 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4508 : _out(out), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4509 _total_used_bytes(0), _total_capacity_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4510 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4511 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
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changeset
|
4512 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4513 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4514 MemRegion g1_committed = g1h->g1_committed(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4515 MemRegion g1_reserved = g1h->g1_reserved(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4516 double now = os::elapsedTime(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4517 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4518 // Print the header of the output. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4519 _out->cr(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4520 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4521 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4522 G1PPRL_SUM_ADDR_FORMAT("committed") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4523 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4524 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4525 g1_committed.start(), g1_committed.end(), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4526 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4527 HeapRegion::GrainBytes); |
2435
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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|
4528 _out->print_cr(G1PPRL_LINE_PREFIX); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4529 _out->print_cr(G1PPRL_LINE_PREFIX |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4530 G1PPRL_TYPE_H_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4531 G1PPRL_ADDR_BASE_H_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4532 G1PPRL_BYTE_H_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4533 G1PPRL_BYTE_H_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4534 G1PPRL_BYTE_H_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4535 G1PPRL_DOUBLE_H_FORMAT, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4536 "type", "address-range", |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4537 "used", "prev-live", "next-live", "gc-eff"); |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4538 _out->print_cr(G1PPRL_LINE_PREFIX |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4539 G1PPRL_TYPE_H_FORMAT |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4540 G1PPRL_ADDR_BASE_H_FORMAT |
5cc33133bc6d
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parents:
3975
diff
changeset
|
4541 G1PPRL_BYTE_H_FORMAT |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4542 G1PPRL_BYTE_H_FORMAT |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4543 G1PPRL_BYTE_H_FORMAT |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4544 G1PPRL_DOUBLE_H_FORMAT, |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4545 "", "", |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4546 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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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|
4547 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4548 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4549 // It takes as a parameter a reference to one of the _hum_* fields, it |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4550 // deduces the corresponding value for a region in a humongous region |
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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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|
4551 // series (either the region size, or what's left if the _hum_* field |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4552 // is < the region size), and updates the _hum_* field accordingly. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4553 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_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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changeset
|
4554 size_t bytes = 0; |
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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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|
4555 // The > 0 check is to deal with the prev and next live bytes which |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4556 // could be 0. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4557 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4558 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4559 *hum_bytes -= 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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diff
changeset
|
4560 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4561 return 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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2369
diff
changeset
|
4562 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4563 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4564 // It deduces the values for a region in a humongous region series |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4565 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4566 // that that _hum_* fields have already been set up from the "starts |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4567 // 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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changeset
|
4568 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4569 size_t* capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4570 size_t* prev_live_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4571 size_t* next_live_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4572 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4573 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4574 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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changeset
|
4575 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4576 *next_live_bytes = get_hum_bytes(&_hum_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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diff
changeset
|
4577 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4578 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4579 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
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|
4580 const char* type = ""; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4581 HeapWord* bottom = r->bottom(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4582 HeapWord* end = r->end(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4583 size_t capacity_bytes = r->capacity(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4584 size_t used_bytes = r->used(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4585 size_t prev_live_bytes = r->live_bytes(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4586 size_t next_live_bytes = r->next_live_bytes(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4587 double gc_eff = r->gc_efficiency(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4588 if (r->used() == 0) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4589 type = "FREE"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4590 } else if (r->is_survivor()) { |
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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|
4591 type = "SURV"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4592 } else if (r->is_young()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4593 type = "EDEN"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4594 } else if (r->startsHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4595 type = "HUMS"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4596 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4597 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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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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|
4598 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4599 "they should have been zeroed after the last time we used them"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4600 // Set up the _hum_* fields. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4601 _hum_capacity_bytes = 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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2369
diff
changeset
|
4602 _hum_used_bytes = 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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2369
diff
changeset
|
4603 _hum_prev_live_bytes = prev_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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2369
diff
changeset
|
4604 _hum_next_live_bytes = next_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4605 get_hum_bytes(&used_bytes, &capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4606 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4607 end = bottom + HeapRegion::GrainWords; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4608 } else if (r->continuesHumongous()) { |
371bbc844bf1
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tonyp
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2369
diff
changeset
|
4609 type = "HUMC"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4610 get_hum_bytes(&used_bytes, &capacity_bytes, |
371bbc844bf1
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2369
diff
changeset
|
4611 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4612 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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diff
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|
4613 } else { |
371bbc844bf1
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diff
changeset
|
4614 type = "OLD"; |
371bbc844bf1
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diff
changeset
|
4615 } |
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diff
changeset
|
4616 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4617 _total_used_bytes += used_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4618 _total_capacity_bytes += capacity_bytes; |
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diff
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4619 _total_prev_live_bytes += prev_live_bytes; |
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4620 _total_next_live_bytes += next_live_bytes; |
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4621 |
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4622 // Print a line for this particular region. |
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4623 _out->print_cr(G1PPRL_LINE_PREFIX |
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4624 G1PPRL_TYPE_FORMAT |
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4625 G1PPRL_ADDR_BASE_FORMAT |
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4626 G1PPRL_BYTE_FORMAT |
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4627 G1PPRL_BYTE_FORMAT |
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4628 G1PPRL_BYTE_FORMAT |
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4629 G1PPRL_DOUBLE_FORMAT, |
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4630 type, bottom, end, |
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4631 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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4632 |
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4633 return false; |
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4634 } |
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4635 |
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4636 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4637 // Print the footer of the output. |
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4638 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4639 _out->print_cr(G1PPRL_LINE_PREFIX |
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4640 " SUMMARY" |
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4641 G1PPRL_SUM_MB_FORMAT("capacity") |
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4642 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4643 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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4644 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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4645 bytes_to_mb(_total_capacity_bytes), |
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4646 bytes_to_mb(_total_used_bytes), |
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4647 perc(_total_used_bytes, _total_capacity_bytes), |
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4648 bytes_to_mb(_total_prev_live_bytes), |
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4649 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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4650 bytes_to_mb(_total_next_live_bytes), |
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4651 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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4652 _out->cr(); |
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4653 } |