Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 8744:15401203db6b
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author | stefank |
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date | Fri, 15 Mar 2013 08:57:55 +0100 |
parents | 9def4075da6d 47bc9800972c |
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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."); |
1833
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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 |
3776
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754 if (verbose_low()) { |
342 | 755 gclog_or_tty->print_cr("[global] resetting"); |
3776
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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. | |
6862
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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_phase(uint active_tasks, bool concurrent) { |
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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); | |
796 | |
797 _concurrent = concurrent; | |
798 // We propagate this to all tasks, not just the active ones. | |
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799 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 800 _tasks[i]->set_concurrent(concurrent); |
801 | |
802 if (concurrent) { | |
803 set_concurrent_marking_in_progress(); | |
804 } else { | |
805 // We currently assume that the concurrent flag has been set to | |
806 // false before we start remark. At this point we should also be | |
807 // in a STW phase. | |
1023
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808 assert(!concurrent_marking_in_progress(), "invariant"); |
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809 assert(_finger == _heap_end, "only way to get here"); |
342 | 810 update_g1_committed(true); |
811 } | |
812 } | |
813 | |
814 void ConcurrentMark::set_non_marking_state() { | |
815 // We set the global marking state to some default values when we're | |
816 // not doing marking. | |
7450
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817 reset_marking_state(); |
342 | 818 _active_tasks = 0; |
819 clear_concurrent_marking_in_progress(); | |
820 } | |
821 | |
822 ConcurrentMark::~ConcurrentMark() { | |
4735 | 823 // The ConcurrentMark instance is never freed. |
824 ShouldNotReachHere(); | |
342 | 825 } |
826 | |
827 void ConcurrentMark::clearNextBitmap() { | |
1359
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828 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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829 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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830 |
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831 // Make sure that the concurrent mark thread looks to still be in |
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832 // the current cycle. |
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833 guarantee(cmThread()->during_cycle(), "invariant"); |
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834 |
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835 // We are finishing up the current cycle by clearing the next |
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836 // marking bitmap and getting it ready for the next cycle. During |
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837 // this time no other cycle can start. So, let's make sure that this |
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838 // is the case. |
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839 guarantee(!g1h->mark_in_progress(), "invariant"); |
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840 |
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841 // clear the mark bitmap (no grey objects to start with). |
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842 // We need to do this in chunks and offer to yield in between |
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843 // each chunk. |
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844 HeapWord* start = _nextMarkBitMap->startWord(); |
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845 HeapWord* end = _nextMarkBitMap->endWord(); |
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846 HeapWord* cur = start; |
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847 size_t chunkSize = M; |
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848 while (cur < end) { |
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849 HeapWord* next = cur + chunkSize; |
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850 if (next > end) { |
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851 next = end; |
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852 } |
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853 MemRegion mr(cur,next); |
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854 _nextMarkBitMap->clearRange(mr); |
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855 cur = next; |
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856 do_yield_check(); |
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857 |
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858 // Repeat the asserts from above. We'll do them as asserts here to |
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859 // minimize their overhead on the product. However, we'll have |
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860 // them as guarantees at the beginning / end of the bitmap |
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861 // clearing to get some checking in the product. |
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862 assert(cmThread()->during_cycle(), "invariant"); |
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863 assert(!g1h->mark_in_progress(), "invariant"); |
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864 } |
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865 |
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866 // Clear the liveness counting data |
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867 clear_all_count_data(); |
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868 |
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869 // Repeat the asserts from above. |
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870 guarantee(cmThread()->during_cycle(), "invariant"); |
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871 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 872 } |
873 | |
874 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
875 public: | |
876 bool doHeapRegion(HeapRegion* r) { | |
877 if (!r->continuesHumongous()) { | |
4787
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878 r->note_start_of_marking(); |
342 | 879 } |
880 return false; | |
881 } | |
882 }; | |
883 | |
884 void ConcurrentMark::checkpointRootsInitialPre() { | |
885 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
886 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
887 | |
888 _has_aborted = false; | |
889 | |
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890 #ifndef PRODUCT |
1044 | 891 if (G1PrintReachableAtInitialMark) { |
1388 | 892 print_reachable("at-cycle-start", |
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893 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 894 } |
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895 #endif |
342 | 896 |
897 // Initialise marking structures. This has to be done in a STW phase. | |
898 reset(); | |
4787
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899 |
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900 // For each region note start of marking. |
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901 NoteStartOfMarkHRClosure startcl; |
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902 g1h->heap_region_iterate(&startcl); |
342 | 903 } |
904 | |
905 | |
906 void ConcurrentMark::checkpointRootsInitialPost() { | |
907 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
908 | |
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909 // If we force an overflow during remark, the remark operation will |
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910 // actually abort and we'll restart concurrent marking. If we always |
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911 // force an oveflow during remark we'll never actually complete the |
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912 // marking phase. So, we initilize this here, at the start of the |
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913 // cycle, so that at the remaining overflow number will decrease at |
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914 // every remark and we'll eventually not need to cause one. |
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915 force_overflow_stw()->init(); |
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916 |
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917 // Start Concurrent Marking weak-reference discovery. |
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918 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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919 // enable ("weak") refs discovery |
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920 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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921 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 922 |
923 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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924 // This is the start of the marking cycle, we're expected all |
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925 // threads to have SATB queues with active set to false. |
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926 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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927 false /* expected_active */); |
342 | 928 |
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929 _root_regions.prepare_for_scan(); |
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930 |
342 | 931 // update_g1_committed() will be called at the end of an evac pause |
932 // when marking is on. So, it's also called at the end of the | |
933 // initial-mark pause to update the heap end, if the heap expands | |
934 // during it. No need to call it here. | |
935 } | |
936 | |
937 /* | |
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938 * Notice that in the next two methods, we actually leave the STS |
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939 * during the barrier sync and join it immediately afterwards. If we |
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940 * do not do this, the following deadlock can occur: one thread could |
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941 * be in the barrier sync code, waiting for the other thread to also |
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942 * sync up, whereas another one could be trying to yield, while also |
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943 * waiting for the other threads to sync up too. |
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944 * |
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945 * Note, however, that this code is also used during remark and in |
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946 * this case we should not attempt to leave / enter the STS, otherwise |
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947 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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948 * (product). So we should only leave / enter the STS if we are |
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949 * operating concurrently. |
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950 * |
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951 * Because the thread that does the sync barrier has left the STS, it |
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952 * is possible to be suspended for a Full GC or an evacuation pause |
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953 * could occur. This is actually safe, since the entering the sync |
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954 * barrier is one of the last things do_marking_step() does, and it |
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955 * doesn't manipulate any data structures afterwards. |
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956 */ |
342 | 957 |
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958 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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959 if (verbose_low()) { |
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960 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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961 } |
342 | 962 |
3316
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963 if (concurrent()) { |
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964 ConcurrentGCThread::stsLeave(); |
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965 } |
342 | 966 _first_overflow_barrier_sync.enter(); |
3316
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967 if (concurrent()) { |
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968 ConcurrentGCThread::stsJoin(); |
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969 } |
342 | 970 // at this point everyone should have synced up and not be doing any |
971 // more work | |
972 | |
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973 if (verbose_low()) { |
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974 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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975 } |
342 | 976 |
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977 // let the task associated with with worker 0 do this |
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978 if (worker_id == 0) { |
342 | 979 // task 0 is responsible for clearing the global data structures |
3316
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980 // We should be here because of an overflow. During STW we should |
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981 // not clear the overflow flag since we rely on it being true when |
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982 // we exit this method to abort the pause and restart concurent |
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983 // marking. |
7450
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984 reset_marking_state(concurrent() /* clear_overflow */); |
3316
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985 force_overflow()->update(); |
342 | 986 |
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987 if (G1Log::fine()) { |
342 | 988 gclog_or_tty->date_stamp(PrintGCDateStamps); |
989 gclog_or_tty->stamp(PrintGCTimeStamps); | |
990 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
991 } | |
992 } | |
993 | |
994 // after this, each task should reset its own data structures then | |
995 // then go into the second barrier | |
996 } | |
997 | |
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998 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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999 if (verbose_low()) { |
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1000 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1001 } |
342 | 1002 |
3316
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1003 if (concurrent()) { |
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1004 ConcurrentGCThread::stsLeave(); |
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1005 } |
342 | 1006 _second_overflow_barrier_sync.enter(); |
3316
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1007 if (concurrent()) { |
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1008 ConcurrentGCThread::stsJoin(); |
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1009 } |
342 | 1010 // at this point everything should be re-initialised and ready to go |
1011 | |
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1012 if (verbose_low()) { |
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1013 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1014 } |
342 | 1015 } |
1016 | |
3316
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1017 #ifndef PRODUCT |
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1018 void ForceOverflowSettings::init() { |
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1019 _num_remaining = G1ConcMarkForceOverflow; |
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1020 _force = false; |
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1021 update(); |
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1022 } |
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1023 |
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1024 void ForceOverflowSettings::update() { |
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1025 if (_num_remaining > 0) { |
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1026 _num_remaining -= 1; |
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1027 _force = true; |
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1028 } else { |
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1029 _force = false; |
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1030 } |
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1031 } |
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1032 |
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1033 bool ForceOverflowSettings::should_force() { |
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1034 if (_force) { |
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1035 _force = false; |
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1036 return true; |
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1037 } else { |
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1038 return false; |
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1039 } |
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1040 } |
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1041 #endif // !PRODUCT |
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1042 |
342 | 1043 class CMConcurrentMarkingTask: public AbstractGangTask { |
1044 private: | |
1045 ConcurrentMark* _cm; | |
1046 ConcurrentMarkThread* _cmt; | |
1047 | |
1048 public: | |
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1049 void work(uint worker_id) { |
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1050 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1051 "this should only be done by a conc GC thread"); |
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1052 ResourceMark rm; |
342 | 1053 |
1054 double start_vtime = os::elapsedVTime(); | |
1055 | |
1056 ConcurrentGCThread::stsJoin(); | |
1057 | |
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1058 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1059 CMTask* the_task = _cm->task(worker_id); |
342 | 1060 the_task->record_start_time(); |
1061 if (!_cm->has_aborted()) { | |
1062 do { | |
1063 double start_vtime_sec = os::elapsedVTime(); | |
1064 double start_time_sec = os::elapsedTime(); | |
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1065 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1066 |
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1067 the_task->do_marking_step(mark_step_duration_ms, |
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1068 true /* do_stealing */, |
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1069 true /* do_termination */); |
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1070 |
342 | 1071 double end_time_sec = os::elapsedTime(); |
1072 double end_vtime_sec = os::elapsedVTime(); | |
1073 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1074 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1075 _cm->clear_has_overflown(); | |
1076 | |
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1077 bool ret = _cm->do_yield_check(worker_id); |
342 | 1078 |
1079 jlong sleep_time_ms; | |
1080 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1081 sleep_time_ms = | |
1082 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1083 ConcurrentGCThread::stsLeave(); | |
1084 os::sleep(Thread::current(), sleep_time_ms, false); | |
1085 ConcurrentGCThread::stsJoin(); | |
1086 } | |
1087 double end_time2_sec = os::elapsedTime(); | |
1088 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1089 | |
1090 #if 0 | |
1091 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1092 "overhead %1.4lf", | |
1093 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1094 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1095 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1096 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1097 #endif | |
1098 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1099 } | |
1100 the_task->record_end_time(); | |
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1101 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1102 |
1103 ConcurrentGCThread::stsLeave(); | |
1104 | |
1105 double end_vtime = os::elapsedVTime(); | |
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1106 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1107 } |
1108 | |
1109 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1110 ConcurrentMarkThread* cmt) : | |
1111 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1112 | |
1113 ~CMConcurrentMarkingTask() { } | |
1114 }; | |
1115 | |
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1116 // Calculates the number of active workers for a concurrent |
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1117 // phase. |
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1118 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1119 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1120 uint n_conc_workers = 0; |
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1121 if (!UseDynamicNumberOfGCThreads || |
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1122 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1123 !ForceDynamicNumberOfGCThreads)) { |
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1124 n_conc_workers = max_parallel_marking_threads(); |
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1125 } else { |
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1126 n_conc_workers = |
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1127 AdaptiveSizePolicy::calc_default_active_workers( |
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1128 max_parallel_marking_threads(), |
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1129 1, /* Minimum workers */ |
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1130 parallel_marking_threads(), |
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1131 Threads::number_of_non_daemon_threads()); |
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1132 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1133 // that scaling has already gone into "_max_parallel_marking_threads". |
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1134 } |
4711 | 1135 assert(n_conc_workers > 0, "Always need at least 1"); |
1136 return n_conc_workers; | |
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1137 } |
4711 | 1138 // If we are not running with any parallel GC threads we will not |
1139 // have spawned any marking threads either. Hence the number of | |
1140 // concurrent workers should be 0. | |
1141 return 0; | |
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1142 } |
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1143 |
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1144 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1145 // Currently, only survivors can be root regions. |
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1146 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1147 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1148 |
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1149 const uintx interval = PrefetchScanIntervalInBytes; |
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1150 HeapWord* curr = hr->bottom(); |
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1151 const HeapWord* end = hr->top(); |
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1152 while (curr < end) { |
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1153 Prefetch::read(curr, interval); |
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1154 oop obj = oop(curr); |
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1155 int size = obj->oop_iterate(&cl); |
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1156 assert(size == obj->size(), "sanity"); |
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1157 curr += size; |
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1158 } |
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1159 } |
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1160 |
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1161 class CMRootRegionScanTask : public AbstractGangTask { |
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1162 private: |
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1163 ConcurrentMark* _cm; |
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1164 |
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1165 public: |
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1166 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1167 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1168 |
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1169 void work(uint worker_id) { |
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1170 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1171 "this should only be done by a conc GC thread"); |
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1172 |
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1173 CMRootRegions* root_regions = _cm->root_regions(); |
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1174 HeapRegion* hr = root_regions->claim_next(); |
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1175 while (hr != NULL) { |
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1176 _cm->scanRootRegion(hr, worker_id); |
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1177 hr = root_regions->claim_next(); |
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1178 } |
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1179 } |
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1180 }; |
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1181 |
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1182 void ConcurrentMark::scanRootRegions() { |
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1183 // scan_in_progress() will have been set to true only if there was |
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1184 // at least one root region to scan. So, if it's false, we |
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1185 // should not attempt to do any further work. |
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1186 if (root_regions()->scan_in_progress()) { |
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1187 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1188 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1189 "Maximum number of marking threads exceeded"); |
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1190 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1191 |
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1192 CMRootRegionScanTask task(this); |
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1193 if (use_parallel_marking_threads()) { |
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1194 _parallel_workers->set_active_workers((int) active_workers); |
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1195 _parallel_workers->run_task(&task); |
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1196 } else { |
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1197 task.work(0); |
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1198 } |
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1199 |
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1200 // It's possible that has_aborted() is true here without actually |
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1201 // aborting the survivor scan earlier. This is OK as it's |
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1202 // mainly used for sanity checking. |
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1203 root_regions()->scan_finished(); |
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1204 } |
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1205 } |
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1206 |
342 | 1207 void ConcurrentMark::markFromRoots() { |
1208 // we might be tempted to assert that: | |
1209 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1210 // "inconsistent argument?"); | |
1211 // However that wouldn't be right, because it's possible that | |
1212 // a safepoint is indeed in progress as a younger generation | |
1213 // stop-the-world GC happens even as we mark in this generation. | |
1214 | |
1215 _restart_for_overflow = false; | |
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1216 force_overflow_conc()->init(); |
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1217 |
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1218 // _g1h has _n_par_threads |
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1219 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1220 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1221 "Maximum number of marking threads exceeded"); |
4711 | 1222 |
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1223 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1224 |
1225 // Parallel task terminator is set in "set_phase()" | |
1226 set_phase(active_workers, true /* concurrent */); | |
342 | 1227 |
1228 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1229 if (use_parallel_marking_threads()) { |
4711 | 1230 _parallel_workers->set_active_workers((int)active_workers); |
1231 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1232 // and the decisions on that MT processing is made elsewhere. | |
1233 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1234 _parallel_workers->run_task(&markingTask); |
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1235 } else { |
342 | 1236 markingTask.work(0); |
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1237 } |
342 | 1238 print_stats(); |
1239 } | |
1240 | |
1241 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1242 // world is stopped at this checkpoint | |
1243 assert(SafepointSynchronize::is_at_safepoint(), | |
1244 "world should be stopped"); | |
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1245 |
342 | 1246 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1247 | |
1248 // If a full collection has happened, we shouldn't do this. | |
1249 if (has_aborted()) { | |
1250 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1251 return; | |
1252 } | |
1253 | |
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1254 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1255 |
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1256 if (VerifyDuringGC) { |
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1257 HandleMark hm; // handle scope |
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1258 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1259 Universe::heap()->prepare_for_verify(); |
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1260 Universe::verify(/* silent */ false, |
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1261 /* option */ VerifyOption_G1UsePrevMarking); |
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1262 } |
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1263 |
342 | 1264 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1265 g1p->record_concurrent_mark_remark_start(); | |
1266 | |
1267 double start = os::elapsedTime(); | |
1268 | |
1269 checkpointRootsFinalWork(); | |
1270 | |
1271 double mark_work_end = os::elapsedTime(); | |
1272 | |
1273 weakRefsWork(clear_all_soft_refs); | |
1274 | |
1275 if (has_overflown()) { | |
1276 // Oops. We overflowed. Restart concurrent marking. | |
1277 _restart_for_overflow = true; | |
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1278 // Clear the marking state because we will be restarting |
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1279 // marking due to overflowing the global mark stack. |
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1280 reset_marking_state(); |
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1281 if (G1TraceMarkStackOverflow) { |
342 | 1282 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1283 } |
342 | 1284 } else { |
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1285 // Aggregate the per-task counting data that we have accumulated |
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1286 // while marking. |
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1287 aggregate_count_data(); |
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1288 |
2149 | 1289 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1290 // We're done with marking. |
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1291 // This is the end of the marking cycle, we're expected all |
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1292 // threads to have SATB queues with active set to true. |
2149 | 1293 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1294 true /* expected_active */); | |
811 | 1295 |
1296 if (VerifyDuringGC) { | |
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1297 HandleMark hm; // handle scope |
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1298 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1299 Universe::heap()->prepare_for_verify(); |
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1300 Universe::verify(/* silent */ false, |
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1301 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1302 } |
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1303 assert(!restart_for_overflow(), "sanity"); |
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1304 // Completely reset the marking state since marking completed |
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1305 set_non_marking_state(); |
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1306 } |
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1307 |
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1308 // Expand the marking stack, if we have to and if we can. |
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1309 if (_markStack.should_expand()) { |
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1310 _markStack.expand(); |
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1311 } |
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1312 |
342 | 1313 // Statistics |
1314 double now = os::elapsedTime(); | |
1315 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1316 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1317 _remark_times.add((now - start) * 1000.0); | |
1318 | |
1319 g1p->record_concurrent_mark_remark_end(); | |
1320 } | |
1321 | |
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1322 // Base class of the closures that finalize and verify the |
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1323 // liveness counting data. |
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1324 class CMCountDataClosureBase: public HeapRegionClosure { |
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1325 protected: |
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1326 G1CollectedHeap* _g1h; |
342 | 1327 ConcurrentMark* _cm; |
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1328 CardTableModRefBS* _ct_bs; |
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1329 |
342 | 1330 BitMap* _region_bm; |
1331 BitMap* _card_bm; | |
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1332 |
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1333 // Takes a region that's not empty (i.e., it has at least one |
829 | 1334 // live object in it and sets its corresponding bit on the region |
1335 // bitmap to 1. If the region is "starts humongous" it will also set | |
1336 // to 1 the bits on the region bitmap that correspond to its | |
1337 // associated "continues humongous" regions. | |
1338 void set_bit_for_region(HeapRegion* hr) { | |
1339 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1340 | |
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1341 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1342 if (!hr->startsHumongous()) { |
1343 // Normal (non-humongous) case: just set the bit. | |
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1344 _region_bm->par_at_put(index, true); |
829 | 1345 } else { |
1346 // Starts humongous case: calculate how many regions are part of | |
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1347 // this humongous region and then set the bit range. |
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1348 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1349 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1350 } |
1351 } | |
1352 | |
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1353 public: |
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1354 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1355 BitMap* region_bm, BitMap* card_bm): |
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1356 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1357 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1358 _region_bm(region_bm), _card_bm(card_bm) { } |
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1359 }; |
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1360 |
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1361 // Closure that calculates the # live objects per region. Used |
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1362 // for verification purposes during the cleanup pause. |
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1363 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1364 CMBitMapRO* _bm; |
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1365 size_t _region_marked_bytes; |
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1366 |
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1367 public: |
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1368 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1369 BitMap* region_bm, BitMap* card_bm) : |
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1370 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1371 _bm(bm), _region_marked_bytes(0) { } |
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1372 |
342 | 1373 bool doHeapRegion(HeapRegion* hr) { |
1374 | |
639 | 1375 if (hr->continuesHumongous()) { |
829 | 1376 // We will ignore these here and process them when their |
1377 // associated "starts humongous" region is processed (see | |
1378 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1379 // associated "starts humongous" region to have their bit set to | |
1380 // 1 since, due to the region chunking in the parallel region | |
1381 // iteration, a "continues humongous" region might be visited | |
1382 // before its associated "starts humongous". | |
639 | 1383 return false; |
1384 } | |
342 | 1385 |
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1386 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1387 HeapWord* start = hr->bottom(); |
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1388 |
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1389 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1390 err_msg("Preconditions not met - " |
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1391 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1392 start, ntams, hr->end())); |
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1393 |
342 | 1394 // Find the first marked object at or after "start". |
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1395 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1396 |
342 | 1397 size_t marked_bytes = 0; |
1398 | |
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1399 while (start < ntams) { |
342 | 1400 oop obj = oop(start); |
1401 int obj_sz = obj->size(); | |
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1402 HeapWord* obj_end = start + obj_sz; |
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1403 |
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1404 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1405 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1406 |
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1407 // Note: if we're looking at the last region in heap - obj_end |
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1408 // could be actually just beyond the end of the heap; end_idx |
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1409 // will then correspond to a (non-existent) card that is also |
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1410 // just beyond the heap. |
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1411 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1412 // end of object is not card aligned - increment to cover |
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1413 // all the cards spanned by the object |
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1414 end_idx += 1; |
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1415 } |
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1416 |
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1417 // Set the bits in the card BM for the cards spanned by this object. |
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1418 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1419 |
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1420 // Add the size of this object to the number of marked bytes. |
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1421 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1422 |
342 | 1423 // Find the next marked object after this one. |
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1424 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1425 } |
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1426 |
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1427 // Mark the allocated-since-marking portion... |
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1428 HeapWord* top = hr->top(); |
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1429 if (ntams < top) { |
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1430 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1431 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1432 |
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1433 // Note: if we're looking at the last region in heap - top |
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1434 // could be actually just beyond the end of the heap; end_idx |
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1435 // will then correspond to a (non-existent) card that is also |
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1436 // just beyond the heap. |
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1437 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1438 // end of object is not card aligned - increment to cover |
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1439 // all the cards spanned by the object |
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1440 end_idx += 1; |
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1441 } |
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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 // This definitely means the region has live objects. |
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1445 set_bit_for_region(hr); |
342 | 1446 } |
1447 | |
1448 // Update the live region bitmap. | |
1449 if (marked_bytes > 0) { | |
829 | 1450 set_bit_for_region(hr); |
342 | 1451 } |
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1452 |
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1453 // Set the marked bytes for the current region so that |
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1454 // it can be queried by a calling verificiation routine |
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1455 _region_marked_bytes = marked_bytes; |
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1456 |
342 | 1457 return false; |
1458 } | |
1459 | |
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1460 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1461 }; |
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1462 |
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1463 // Heap region closure used for verifying the counting data |
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1464 // that was accumulated concurrently and aggregated during |
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1465 // the remark pause. This closure is applied to the heap |
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1466 // regions during the STW cleanup pause. |
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1467 |
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1468 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1469 G1CollectedHeap* _g1h; |
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1470 ConcurrentMark* _cm; |
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1471 CalcLiveObjectsClosure _calc_cl; |
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1472 BitMap* _region_bm; // Region BM to be verified |
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1473 BitMap* _card_bm; // Card BM to be verified |
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1474 bool _verbose; // verbose output? |
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1475 |
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1476 BitMap* _exp_region_bm; // Expected Region BM values |
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1477 BitMap* _exp_card_bm; // Expected card BM values |
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1478 |
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1479 int _failures; |
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1480 |
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1481 public: |
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1482 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1483 BitMap* region_bm, |
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1484 BitMap* card_bm, |
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1485 BitMap* exp_region_bm, |
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1486 BitMap* exp_card_bm, |
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1487 bool verbose) : |
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1488 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1489 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1490 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1491 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1492 _failures(0) { } |
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1493 |
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1494 int failures() const { return _failures; } |
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1495 |
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1496 bool doHeapRegion(HeapRegion* hr) { |
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1497 if (hr->continuesHumongous()) { |
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1498 // We will ignore these here and process them when their |
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1499 // associated "starts humongous" region is processed (see |
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1500 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1501 // associated "starts humongous" region to have their bit set to |
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1502 // 1 since, due to the region chunking in the parallel region |
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1503 // iteration, a "continues humongous" region might be visited |
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1504 // before its associated "starts humongous". |
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1505 return false; |
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1506 } |
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1507 |
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1508 int failures = 0; |
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1509 |
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1510 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1511 // this region and set the corresponding bits in the expected region |
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1512 // and card bitmaps. |
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1513 bool res = _calc_cl.doHeapRegion(hr); |
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1514 assert(res == false, "should be continuing"); |
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1515 |
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1516 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1517 Mutex::_no_safepoint_check_flag); |
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1518 |
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1519 // Verify the marked bytes for this region. |
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1520 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1521 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1522 |
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1523 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1524 // we have missed accounting some objects during the actual marking. |
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1525 if (exp_marked_bytes > act_marked_bytes) { |
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1526 if (_verbose) { |
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1527 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1528 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1529 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1530 } |
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|
1531 failures += 1; |
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|
1532 } |
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|
1533 |
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1534 // Verify the bit, for this region, in the actual and expected |
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1535 // (which was just calculated) region bit maps. |
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1536 // We're not OK if the bit in the calculated expected region |
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1537 // bitmap is set and the bit in the actual region bitmap is not. |
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|
1538 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
4836
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1539 |
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|
1540 bool expected = _exp_region_bm->at(index); |
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|
1541 bool actual = _region_bm->at(index); |
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|
1542 if (expected && !actual) { |
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|
1543 if (_verbose) { |
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1544 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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|
1545 "expected: %s, actual: %s", |
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|
1546 hr->hrs_index(), |
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|
1547 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
4836
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|
1548 } |
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|
1549 failures += 1; |
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|
1550 } |
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|
1551 |
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|
1552 // Verify that the card bit maps for the cards spanned by the current |
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1553 // region match. We have an error if we have a set bit in the expected |
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|
1554 // bit map and the corresponding bit in the actual bitmap is not set. |
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|
1555 |
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|
1556 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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|
1557 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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|
1558 |
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|
1559 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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|
1560 expected = _exp_card_bm->at(i); |
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|
1561 actual = _card_bm->at(i); |
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|
1562 |
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|
1563 if (expected && !actual) { |
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|
1564 if (_verbose) { |
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|
1565 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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|
1566 "expected: %s, actual: %s", |
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|
1567 hr->hrs_index(), i, |
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|
1568 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
4836
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|
1569 } |
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|
1570 failures += 1; |
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|
1571 } |
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|
1572 } |
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|
1573 |
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|
1574 if (failures > 0 && _verbose) { |
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|
1575 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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|
1576 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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|
1577 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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|
1578 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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|
1579 } |
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changeset
|
1580 |
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|
1581 _failures += failures; |
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changeset
|
1582 |
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|
1583 // We could stop iteration over the heap when we |
6027
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|
1584 // find the first violating region by returning true. |
4836
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|
1585 return false; |
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|
1586 } |
342 | 1587 }; |
1588 | |
1589 | |
4836
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|
1590 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1591 protected: |
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1592 G1CollectedHeap* _g1h; |
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1593 ConcurrentMark* _cm; |
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1594 BitMap* _actual_region_bm; |
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1595 BitMap* _actual_card_bm; |
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1596 |
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1597 uint _n_workers; |
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|
1598 |
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1599 BitMap* _expected_region_bm; |
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1600 BitMap* _expected_card_bm; |
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1601 |
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1602 int _failures; |
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1603 bool _verbose; |
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1604 |
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1605 public: |
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1606 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1607 BitMap* region_bm, BitMap* card_bm, |
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1608 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1609 : AbstractGangTask("G1 verify final counting"), |
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1610 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1611 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1612 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1613 _failures(0), _verbose(false), |
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1614 _n_workers(0) { |
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1615 assert(VerifyDuringGC, "don't call this otherwise"); |
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1616 |
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1617 // Use the value already set as the number of active threads |
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1618 // in the call to run_task(). |
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1619 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1620 assert( _g1h->workers()->active_workers() > 0, |
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1621 "Should have been previously set"); |
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1622 _n_workers = _g1h->workers()->active_workers(); |
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1623 } else { |
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1624 _n_workers = 1; |
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1625 } |
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|
1626 |
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1627 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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1628 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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1629 |
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1630 _verbose = _cm->verbose_medium(); |
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1631 } |
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|
1632 |
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1633 void work(uint worker_id) { |
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1634 assert(worker_id < _n_workers, "invariant"); |
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1635 |
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1636 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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1637 _actual_region_bm, _actual_card_bm, |
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1638 _expected_region_bm, |
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|
1639 _expected_card_bm, |
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1640 _verbose); |
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|
1641 |
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1642 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1643 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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1644 worker_id, |
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|
1645 _n_workers, |
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|
1646 HeapRegion::VerifyCountClaimValue); |
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1647 } else { |
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1648 _g1h->heap_region_iterate(&verify_cl); |
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|
1649 } |
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|
1650 |
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|
1651 Atomic::add(verify_cl.failures(), &_failures); |
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1652 } |
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|
1653 |
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|
1654 int failures() const { return _failures; } |
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|
1655 }; |
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|
1656 |
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1657 // Closure that finalizes the liveness counting data. |
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1658 // Used during the cleanup pause. |
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1659 // Sets the bits corresponding to the interval [NTAMS, top] |
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1660 // (which contains the implicitly live objects) in the |
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1661 // card liveness bitmap. Also sets the bit for each region, |
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1662 // containing live data, in the region liveness bitmap. |
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|
1663 |
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|
1664 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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|
1665 public: |
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|
1666 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
4836
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1667 BitMap* region_bm, |
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|
1668 BitMap* card_bm) : |
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1669 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1670 |
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|
1671 bool doHeapRegion(HeapRegion* hr) { |
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|
1672 |
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|
1673 if (hr->continuesHumongous()) { |
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1674 // We will ignore these here and process them when their |
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1675 // associated "starts humongous" region is processed (see |
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|
1676 // set_bit_for_heap_region()). Note that we cannot rely on their |
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|
1677 // associated "starts humongous" region to have their bit set to |
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|
1678 // 1 since, due to the region chunking in the parallel region |
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|
1679 // iteration, a "continues humongous" region might be visited |
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|
1680 // before its associated "starts humongous". |
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|
1681 return false; |
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|
1682 } |
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|
1683 |
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|
1684 HeapWord* ntams = hr->next_top_at_mark_start(); |
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|
1685 HeapWord* top = hr->top(); |
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|
1686 |
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1687 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1688 |
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|
1689 // Mark the allocated-since-marking portion... |
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|
1690 if (ntams < top) { |
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|
1691 // This definitely means the region has live objects. |
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|
1692 set_bit_for_region(hr); |
6812
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|
1693 |
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|
1694 // Now set the bits in the card bitmap for [ntams, top) |
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|
1695 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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|
1696 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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|
1697 |
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|
1698 // Note: if we're looking at the last region in heap - top |
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|
1699 // could be actually just beyond the end of the heap; end_idx |
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1700 // will then correspond to a (non-existent) card that is also |
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|
1701 // just beyond the heap. |
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|
1702 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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|
1703 // end of object is not card aligned - increment to cover |
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|
1704 // all the cards spanned by the object |
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|
1705 end_idx += 1; |
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|
1706 } |
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|
1707 |
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|
1708 assert(end_idx <= _card_bm->size(), |
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|
1709 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1710 end_idx, _card_bm->size())); |
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|
1711 assert(start_idx < _card_bm->size(), |
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|
1712 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1713 start_idx, _card_bm->size())); |
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|
1714 |
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|
1715 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
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1716 } |
4836
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|
1717 |
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1718 // Set the bit for the region if it contains live data |
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1719 if (hr->next_marked_bytes() > 0) { |
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1720 set_bit_for_region(hr); |
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1721 } |
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1722 |
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1723 return false; |
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1724 } |
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1725 }; |
342 | 1726 |
1727 class G1ParFinalCountTask: public AbstractGangTask { | |
1728 protected: | |
1729 G1CollectedHeap* _g1h; | |
4836
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1730 ConcurrentMark* _cm; |
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1731 BitMap* _actual_region_bm; |
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1732 BitMap* _actual_card_bm; |
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1733 |
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1734 uint _n_workers; |
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1735 |
342 | 1736 public: |
4836
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1737 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1738 : AbstractGangTask("G1 final counting"), |
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1739 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1740 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1741 _n_workers(0) { |
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1742 // Use the value already set as the number of active threads |
6011 | 1743 // in the call to run_task(). |
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1744 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1745 assert( _g1h->workers()->active_workers() > 0, |
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1746 "Should have been previously set"); |
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1747 _n_workers = _g1h->workers()->active_workers(); |
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1748 } else { |
342 | 1749 _n_workers = 1; |
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1750 } |
342 | 1751 } |
1752 | |
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1753 void work(uint worker_id) { |
4836
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1754 assert(worker_id < _n_workers, "invariant"); |
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1755 |
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1756 FinalCountDataUpdateClosure final_update_cl(_g1h, |
4836
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1757 _actual_region_bm, |
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1758 _actual_card_bm); |
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1759 |
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1760 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1761 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1762 worker_id, |
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1763 _n_workers, |
355 | 1764 HeapRegion::FinalCountClaimValue); |
342 | 1765 } else { |
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1766 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1767 } |
1768 } | |
1769 }; | |
1770 | |
1771 class G1ParNoteEndTask; | |
1772 | |
1773 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1774 G1CollectedHeap* _g1; | |
1775 int _worker_num; | |
1776 size_t _max_live_bytes; | |
6010
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1777 uint _regions_claimed; |
342 | 1778 size_t _freed_bytes; |
2173 | 1779 FreeRegionList* _local_cleanup_list; |
4072 | 1780 OldRegionSet* _old_proxy_set; |
2173 | 1781 HumongousRegionSet* _humongous_proxy_set; |
1782 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1783 double _claimed_region_time; |
1784 double _max_region_time; | |
1785 | |
1786 public: | |
1787 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1788 int worker_num, |
1789 FreeRegionList* local_cleanup_list, | |
4072 | 1790 OldRegionSet* old_proxy_set, |
2173 | 1791 HumongousRegionSet* humongous_proxy_set, |
4093
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1792 HRRSCleanupTask* hrrs_cleanup_task) : |
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1793 _g1(g1), _worker_num(worker_num), |
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1794 _max_live_bytes(0), _regions_claimed(0), |
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1795 _freed_bytes(0), |
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1796 _claimed_region_time(0.0), _max_region_time(0.0), |
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1797 _local_cleanup_list(local_cleanup_list), |
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1798 _old_proxy_set(old_proxy_set), |
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1799 _humongous_proxy_set(humongous_proxy_set), |
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1800 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1801 |
342 | 1802 size_t freed_bytes() { return _freed_bytes; } |
1803 | |
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1804 bool doHeapRegion(HeapRegion *hr) { |
6254
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1805 if (hr->continuesHumongous()) { |
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1806 return false; |
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1807 } |
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1808 // We use a claim value of zero here because all regions |
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1809 // were claimed with value 1 in the FinalCount task. |
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1810 _g1->reset_gc_time_stamps(hr); |
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1811 double start = os::elapsedTime(); |
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1812 _regions_claimed++; |
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1813 hr->note_end_of_marking(); |
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1814 _max_live_bytes += hr->max_live_bytes(); |
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1815 _g1->free_region_if_empty(hr, |
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1816 &_freed_bytes, |
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1817 _local_cleanup_list, |
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1818 _old_proxy_set, |
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1819 _humongous_proxy_set, |
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1820 _hrrs_cleanup_task, |
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1821 true /* par */); |
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1822 double region_time = (os::elapsedTime() - start); |
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1823 _claimed_region_time += region_time; |
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1824 if (region_time > _max_region_time) { |
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1825 _max_region_time = region_time; |
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1826 } |
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1827 return false; |
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1828 } |
342 | 1829 |
1830 size_t max_live_bytes() { return _max_live_bytes; } | |
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1831 uint regions_claimed() { return _regions_claimed; } |
342 | 1832 double claimed_region_time_sec() { return _claimed_region_time; } |
1833 double max_region_time_sec() { return _max_region_time; } | |
1834 }; | |
1835 | |
1836 class G1ParNoteEndTask: public AbstractGangTask { | |
1837 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1838 |
342 | 1839 protected: |
1840 G1CollectedHeap* _g1h; | |
1841 size_t _max_live_bytes; | |
1842 size_t _freed_bytes; | |
2152 | 1843 FreeRegionList* _cleanup_list; |
1844 | |
342 | 1845 public: |
1846 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1847 FreeRegionList* cleanup_list) : |
342 | 1848 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1849 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1850 |
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1851 void work(uint worker_id) { |
342 | 1852 double start = os::elapsedTime(); |
2173 | 1853 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1854 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1855 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1856 HRRSCleanupTask hrrs_cleanup_task; | |
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1857 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1858 &old_proxy_set, |
2173 | 1859 &humongous_proxy_set, |
1860 &hrrs_cleanup_task); | |
1833
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1861 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1862 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1863 _g1h->workers()->active_workers(), |
355 | 1864 HeapRegion::NoteEndClaimValue); |
342 | 1865 } else { |
1866 _g1h->heap_region_iterate(&g1_note_end); | |
1867 } | |
1868 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1869 | |
2152 | 1870 // Now update the lists |
1871 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1872 NULL /* free_list */, | |
4072 | 1873 &old_proxy_set, |
2173 | 1874 &humongous_proxy_set, |
2152 | 1875 true /* par */); |
342 | 1876 { |
1877 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1878 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1879 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1880 |
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1881 // If we iterate over the global cleanup list at the end of |
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1882 // cleanup to do this printing we will not guarantee to only |
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1883 // generate output for the newly-reclaimed regions (the list |
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1884 // might not be empty at the beginning of cleanup; we might |
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1885 // still be working on its previous contents). So we do the |
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1886 // printing here, before we append the new regions to the global |
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1887 // cleanup list. |
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1888 |
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1889 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1890 if (hr_printer->is_active()) { |
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1891 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1892 while (iter.more_available()) { |
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1893 HeapRegion* hr = iter.get_next(); |
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1894 hr_printer->cleanup(hr); |
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1895 } |
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1896 } |
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1897 |
2173 | 1898 _cleanup_list->add_as_tail(&local_cleanup_list); |
1899 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1900 | |
1901 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1902 } |
1903 } | |
1904 size_t max_live_bytes() { return _max_live_bytes; } | |
1905 size_t freed_bytes() { return _freed_bytes; } | |
1906 }; | |
1907 | |
1908 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1909 protected: | |
1910 G1RemSet* _g1rs; | |
1911 BitMap* _region_bm; | |
1912 BitMap* _card_bm; | |
1913 public: | |
1914 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1915 BitMap* region_bm, BitMap* card_bm) : | |
1916 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1917 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1918 |
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1919 void work(uint worker_id) { |
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1920 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1921 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1922 HeapRegion::ScrubRemSetClaimValue); |
342 | 1923 } else { |
1924 _g1rs->scrub(_region_bm, _card_bm); | |
1925 } | |
1926 } | |
1927 | |
1928 }; | |
1929 | |
1930 void ConcurrentMark::cleanup() { | |
1931 // world is stopped at this checkpoint | |
1932 assert(SafepointSynchronize::is_at_safepoint(), | |
1933 "world should be stopped"); | |
1934 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1935 | |
1936 // If a full collection has happened, we shouldn't do this. | |
1937 if (has_aborted()) { | |
1938 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1939 return; | |
1940 } | |
1941 | |
4072 | 1942 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1943 g1h->verify_region_sets_optional(); |
1944 | |
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1945 if (VerifyDuringGC) { |
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1946 HandleMark hm; // handle scope |
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1947 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1948 Universe::heap()->prepare_for_verify(); |
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1949 Universe::verify(/* silent */ false, |
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1950 /* option */ VerifyOption_G1UsePrevMarking); |
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1951 } |
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1952 |
342 | 1953 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1954 g1p->record_concurrent_mark_cleanup_start(); | |
1955 | |
1956 double start = os::elapsedTime(); | |
1957 | |
2173 | 1958 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1959 | |
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1960 uint n_workers; |
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1961 |
342 | 1962 // Do counting once more with the world stopped for good measure. |
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1963 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1964 |
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1965 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1966 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1967 "sanity check"); |
1968 | |
4711 | 1969 g1h->set_par_threads(); |
1970 n_workers = g1h->n_par_threads(); | |
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1971 assert(g1h->n_par_threads() == n_workers, |
4711 | 1972 "Should not have been reset"); |
342 | 1973 g1h->workers()->run_task(&g1_par_count_task); |
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1974 // Done with the parallel phase so reset to 0. |
342 | 1975 g1h->set_par_threads(0); |
355 | 1976 |
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1977 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 1978 "sanity check"); |
342 | 1979 } else { |
4711 | 1980 n_workers = 1; |
342 | 1981 g1_par_count_task.work(0); |
1982 } | |
1983 | |
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1984 if (VerifyDuringGC) { |
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1985 // Verify that the counting data accumulated during marking matches |
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1986 // that calculated by walking the marking bitmap. |
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1987 |
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1988 // Bitmaps to hold expected values |
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1989 BitMap expected_region_bm(_region_bm.size(), false); |
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1990 BitMap expected_card_bm(_card_bm.size(), false); |
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1991 |
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1992 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1993 &_region_bm, |
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1994 &_card_bm, |
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1995 &expected_region_bm, |
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1996 &expected_card_bm); |
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1997 |
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1998 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1999 g1h->set_par_threads((int)n_workers); |
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2000 g1h->workers()->run_task(&g1_par_verify_task); |
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2001 // Done with the parallel phase so reset to 0. |
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2002 g1h->set_par_threads(0); |
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2003 |
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2004 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2005 "sanity check"); |
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2006 } else { |
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2007 g1_par_verify_task.work(0); |
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2008 } |
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2009 |
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2010 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2011 } |
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2012 |
342 | 2013 size_t start_used_bytes = g1h->used(); |
2014 g1h->set_marking_complete(); | |
2015 | |
2016 double count_end = os::elapsedTime(); | |
2017 double this_final_counting_time = (count_end - start); | |
2018 _total_counting_time += this_final_counting_time; | |
2019 | |
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2020 if (G1PrintRegionLivenessInfo) { |
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2021 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2022 _g1h->heap_region_iterate(&cl); |
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2023 } |
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2024 |
342 | 2025 // Install newly created mark bitMap as "prev". |
2026 swapMarkBitMaps(); | |
2027 | |
2028 g1h->reset_gc_time_stamp(); | |
2029 | |
2030 // Note end of marking in all heap regions. | |
2152 | 2031 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2032 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2033 g1h->set_par_threads((int)n_workers); |
342 | 2034 g1h->workers()->run_task(&g1_par_note_end_task); |
2035 g1h->set_par_threads(0); | |
355 | 2036 |
2037 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2038 "sanity check"); | |
342 | 2039 } else { |
2040 g1_par_note_end_task.work(0); | |
2041 } | |
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2042 g1h->check_gc_time_stamps(); |
2152 | 2043 |
2044 if (!cleanup_list_is_empty()) { | |
2045 // The cleanup list is not empty, so we'll have to process it | |
2046 // concurrently. Notify anyone else that might be wanting free | |
2047 // regions that there will be more free regions coming soon. | |
2048 g1h->set_free_regions_coming(); | |
2049 } | |
342 | 2050 |
2051 // call below, since it affects the metric by which we sort the heap | |
2052 // regions. | |
2053 if (G1ScrubRemSets) { | |
2054 double rs_scrub_start = os::elapsedTime(); | |
2055 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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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_scrub_rs_task); |
2059 g1h->set_par_threads(0); | |
355 | 2060 |
2061 assert(g1h->check_heap_region_claim_values( | |
2062 HeapRegion::ScrubRemSetClaimValue), | |
2063 "sanity check"); | |
342 | 2064 } else { |
2065 g1_par_scrub_rs_task.work(0); | |
2066 } | |
2067 | |
2068 double rs_scrub_end = os::elapsedTime(); | |
2069 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2070 _total_rs_scrub_time += this_rs_scrub_time; | |
2071 } | |
2072 | |
2073 // this will also free any regions totally full of garbage objects, | |
2074 // and sort the regions. | |
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2075 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2076 |
2077 // Statistics. | |
2078 double end = os::elapsedTime(); | |
2079 _cleanup_times.add((end - start) * 1000.0); | |
2080 | |
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2081 if (G1Log::fine()) { |
342 | 2082 g1h->print_size_transition(gclog_or_tty, |
2083 start_used_bytes, | |
2084 g1h->used(), | |
2085 g1h->capacity()); | |
2086 } | |
2087 | |
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2088 // Clean up will have freed any regions completely full of garbage. |
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2089 // Update the soft reference policy with the new heap occupancy. |
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2090 Universe::update_heap_info_at_gc(); |
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2091 |
342 | 2092 // We need to make this be a "collection" so any collection pause that |
2093 // races with it goes around and waits for completeCleanup to finish. | |
2094 g1h->increment_total_collections(); | |
2095 | |
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2096 // We reclaimed old regions so we should calculate the sizes to make |
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2097 // sure we update the old gen/space data. |
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2098 g1h->g1mm()->update_sizes(); |
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2099 |
751 | 2100 if (VerifyDuringGC) { |
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2101 HandleMark hm; // handle scope |
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2102 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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2103 Universe::heap()->prepare_for_verify(); |
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2104 Universe::verify(/* silent */ false, |
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2105 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 2106 } |
2152 | 2107 |
2108 g1h->verify_region_sets_optional(); | |
342 | 2109 } |
2110 | |
2111 void ConcurrentMark::completeCleanup() { | |
2112 if (has_aborted()) return; | |
2113 | |
2152 | 2114 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2115 | |
2116 _cleanup_list.verify_optional(); | |
2361 | 2117 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2118 |
2119 if (G1ConcRegionFreeingVerbose) { | |
2120 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
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2121 "cleanup list has %u entries", |
2152 | 2122 _cleanup_list.length()); |
2123 } | |
2124 | |
2125 // Noone else should be accessing the _cleanup_list at this point, | |
2126 // so it's not necessary to take any locks | |
2127 while (!_cleanup_list.is_empty()) { | |
2128 HeapRegion* hr = _cleanup_list.remove_head(); | |
2129 assert(hr != NULL, "the list was not empty"); | |
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2130 hr->par_clear(); |
2361 | 2131 tmp_free_list.add_as_tail(hr); |
2152 | 2132 |
2133 // Instead of adding one region at a time to the secondary_free_list, | |
2134 // we accumulate them in the local list and move them a few at a | |
2135 // time. This also cuts down on the number of notify_all() calls | |
2136 // we do during this process. We'll also append the local list when | |
2137 // _cleanup_list is empty (which means we just removed the last | |
2138 // region from the _cleanup_list). | |
2361 | 2139 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2140 _cleanup_list.is_empty()) { |
2141 if (G1ConcRegionFreeingVerbose) { | |
2142 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
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2143 "appending %u entries to the secondary_free_list, " |
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2144 "cleanup list still has %u entries", |
2361 | 2145 tmp_free_list.length(), |
2152 | 2146 _cleanup_list.length()); |
342 | 2147 } |
2152 | 2148 |
2149 { | |
2150 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2151 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2152 SecondaryFreeList_lock->notify_all(); |
2153 } | |
2154 | |
2155 if (G1StressConcRegionFreeing) { | |
2156 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2157 os::sleep(Thread::current(), (jlong) 1, false); | |
2158 } | |
2159 } | |
342 | 2160 } |
2161 } | |
2361 | 2162 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2163 } |
2164 | |
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2165 // Supporting Object and Oop closures for reference discovery |
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2166 // and processing in during marking |
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2167 |
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2168 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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|
2169 HeapWord* addr = (HeapWord*)obj; |
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diff
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|
2170 return addr != NULL && |
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|
2171 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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|
2172 } |
342 | 2173 |
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2174 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
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2175 // Uses the CMTask associated with a worker thread (for serial reference |
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2176 // processing the CMTask for worker 0 is used) to preserve (mark) and |
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|
2177 // trace referent objects. |
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|
2178 // |
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|
2179 // Using the CMTask and embedded local queues avoids having the worker |
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|
2180 // threads operating on the global mark stack. This reduces the risk |
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|
2181 // of overflowing the stack - which we would rather avoid at this late |
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2182 // state. Also using the tasks' local queues removes the potential |
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2183 // of the workers interfering with each other that could occur if |
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|
2184 // operating on the global stack. |
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|
2185 |
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|
2186 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
2174
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|
2187 ConcurrentMark* _cm; |
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|
2188 CMTask* _task; |
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|
2189 int _ref_counter_limit; |
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|
2190 int _ref_counter; |
234761c55641
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|
2191 public: |
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2192 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2193 _cm(cm), _task(task), _ref_counter_limit(G1RefProcDrainInterval) { |
2174
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2194 assert(_ref_counter_limit > 0, "sanity"); |
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2195 _ref_counter = _ref_counter_limit; |
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|
2196 } |
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|
2197 |
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|
2198 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
2199 virtual void do_oop( oop* p) { do_oop_work(p); } |
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|
2200 |
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|
2201 template <class T> void do_oop_work(T* p) { |
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|
2202 if (!_cm->has_overflown()) { |
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|
2203 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2204 if (_cm->verbose_high()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
2205 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
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|
2206 "*"PTR_FORMAT" = "PTR_FORMAT, |
6862
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|
2207 _task->worker_id(), p, (void*) obj); |
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|
2208 } |
2174
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|
2209 |
234761c55641
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|
2210 _task->deal_with_reference(obj); |
234761c55641
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|
2211 _ref_counter--; |
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|
2212 |
234761c55641
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|
2213 if (_ref_counter == 0) { |
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|
2214 // We have dealt with _ref_counter_limit references, pushing them |
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|
2215 // and objects reachable from them on to the local stack (and |
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|
2216 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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|
2217 // process these entries. |
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|
2218 // |
f90b9bceb8e5
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|
2219 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
f90b9bceb8e5
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|
2220 // there's nothing more to do (i.e. we're done with the entries that |
f90b9bceb8e5
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|
2221 // were pushed as a result of the CMTask::deal_with_reference() calls |
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|
2222 // above) or we overflow. |
f90b9bceb8e5
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|
2223 // |
f90b9bceb8e5
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|
2224 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
f90b9bceb8e5
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|
2225 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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diff
changeset
|
2226 // the beginning of CMTask::do_marking_step() for those conditions - |
f90b9bceb8e5
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parents:
8008
diff
changeset
|
2227 // one of which is reaching the specified time target.) It is only |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
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diff
changeset
|
2228 // when CMTask::do_marking_step() returns without setting the |
f90b9bceb8e5
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johnc
parents:
8008
diff
changeset
|
2229 // has_aborted() flag that the marking step has completed. |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2230 do { |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2231 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
234761c55641
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2152
diff
changeset
|
2232 _task->do_marking_step(mark_step_duration_ms, |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
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|
2233 false /* do_stealing */, |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2234 false /* do_termination */); |
234761c55641
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parents:
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diff
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|
2235 } while (_task->has_aborted() && !_cm->has_overflown()); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
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|
2236 _ref_counter = _ref_counter_limit; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2237 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2238 } else { |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
2239 if (_cm->verbose_high()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2240 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
3776
23d434c6290d
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3772
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|
2241 } |
2174
234761c55641
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parents:
2152
diff
changeset
|
2242 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2243 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2244 }; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2245 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2246 // 'Drain' oop closure used by both serial and parallel reference processing. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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diff
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|
2247 // Uses the CMTask associated with a given worker thread (for serial |
f90b9bceb8e5
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johnc
parents:
8008
diff
changeset
|
2248 // reference processing the CMtask for worker 0 is used). Calls the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2249 // do_marking_step routine, with an unbelievably large timeout value, |
f90b9bceb8e5
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johnc
parents:
8008
diff
changeset
|
2250 // to drain the marking data structures of the remaining entries |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2251 // added by the 'keep alive' oop closure above. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2252 |
f90b9bceb8e5
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johnc
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diff
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|
2253 class G1CMDrainMarkingStackClosure: public VoidClosure { |
2174
234761c55641
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2152
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|
2254 ConcurrentMark* _cm; |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
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|
2255 CMTask* _task; |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2256 bool _do_stealing; |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2257 bool _do_termination; |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2258 public: |
8014
f90b9bceb8e5
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diff
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|
2259 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_par) : |
f90b9bceb8e5
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|
2260 _cm(cm), _task(task) { |
f90b9bceb8e5
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|
2261 assert(is_par || _task->worker_id() == 0, |
f90b9bceb8e5
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diff
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|
2262 "Only task for worker 0 should be used if ref processing is single threaded"); |
f90b9bceb8e5
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diff
changeset
|
2263 // We only allow stealing and only enter the termination protocol |
f90b9bceb8e5
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|
2264 // in CMTask::do_marking_step() if this closure is being instantiated |
f90b9bceb8e5
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8008
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|
2265 // for parallel reference processing. |
f90b9bceb8e5
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|
2266 _do_stealing = _do_termination = is_par; |
f90b9bceb8e5
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|
2267 } |
2174
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diff
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|
2268 |
234761c55641
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diff
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|
2269 void do_void() { |
234761c55641
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|
2270 do { |
3776
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|
2271 if (_cm->verbose_high()) { |
8014
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|
2272 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - " |
f90b9bceb8e5
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|
2273 "stealing: %s, termination: %s", |
f90b9bceb8e5
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|
2274 _task->worker_id(), |
f90b9bceb8e5
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changeset
|
2275 BOOL_TO_STR(_do_stealing), |
f90b9bceb8e5
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|
2276 BOOL_TO_STR(_do_termination)); |
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|
2277 } |
2174
234761c55641
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|
2278 |
8014
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|
2279 // We call CMTask::do_marking_step() to completely drain the local |
f90b9bceb8e5
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|
2280 // and global marking stacks of entries pushed by the 'keep alive' |
f90b9bceb8e5
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|
2281 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
f90b9bceb8e5
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|
2282 // |
f90b9bceb8e5
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|
2283 // CMTask::do_marking_step() is called in a loop, which we'll exit |
f90b9bceb8e5
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changeset
|
2284 // if there's nothing more to do (i.e. we'completely drained the |
f90b9bceb8e5
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diff
changeset
|
2285 // entries that were pushed as a a result of applying the 'keep alive' |
f90b9bceb8e5
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|
2286 // closure to the entries on the discovered ref lists) or we overflow |
f90b9bceb8e5
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|
2287 // the global marking stack. |
f90b9bceb8e5
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|
2288 // |
f90b9bceb8e5
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|
2289 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
f90b9bceb8e5
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changeset
|
2290 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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changeset
|
2291 // the beginning of CMTask::do_marking_step() for those conditions - |
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2292 // one of which is reaching the specified time target.) It is only |
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2293 // when CMTask::do_marking_step() returns without setting the |
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2294 // has_aborted() flag that the marking step has completed. |
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2295 |
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2296 _task->do_marking_step(1000000000.0 /* something very large */, |
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2297 _do_stealing, |
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2298 _do_termination); |
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2299 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2300 } |
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2301 }; |
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2302 |
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2303 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2304 // reference processing at the end of G1 concurrent marking |
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2305 |
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2306 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2307 private: |
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2308 G1CollectedHeap* _g1h; |
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2309 ConcurrentMark* _cm; |
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2310 WorkGang* _workers; |
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2311 int _active_workers; |
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2312 |
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2313 public: |
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2314 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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2315 ConcurrentMark* cm, |
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2316 WorkGang* workers, |
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2317 int n_workers) : |
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2318 _g1h(g1h), _cm(cm), |
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2319 _workers(workers), _active_workers(n_workers) { } |
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2320 |
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2321 // Executes the given task using concurrent marking worker threads. |
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2322 virtual void execute(ProcessTask& task); |
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2323 virtual void execute(EnqueueTask& task); |
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2324 }; |
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2325 |
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2326 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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2327 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2328 ProcessTask& _proc_task; |
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2329 G1CollectedHeap* _g1h; |
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2330 ConcurrentMark* _cm; |
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2331 bool _processing_is_mt; |
2174
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2332 |
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2333 public: |
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2334 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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2335 G1CollectedHeap* g1h, |
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2336 ConcurrentMark* cm) : |
2174
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2337 AbstractGangTask("Process reference objects in parallel"), |
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2338 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
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2339 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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2340 _processing_is_mt = rp->processing_is_mt(); |
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2341 } |
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2342 |
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2343 virtual void work(uint worker_id) { |
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2344 CMTask* marking_task = _cm->task(worker_id); |
2174
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2345 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2346 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
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2347 G1CMDrainMarkingStackClosure g1_par_drain(_cm, marking_task, _processing_is_mt); |
2174
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2348 |
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2349 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
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2350 } |
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2351 }; |
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2352 |
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2353 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
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2354 assert(_workers != NULL, "Need parallel worker threads."); |
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2355 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
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2356 |
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2357 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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2358 |
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2359 // We need to reset the phase for each task execution so that |
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2360 // the termination protocol of CMTask::do_marking_step works. |
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2361 _cm->set_phase(_active_workers, false /* concurrent */); |
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2362 _g1h->set_par_threads(_active_workers); |
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2363 _workers->run_task(&proc_task_proxy); |
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|
2364 _g1h->set_par_threads(0); |
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|
2365 } |
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|
2366 |
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2367 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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2368 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
2369 EnqueueTask& _enq_task; |
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|
2370 |
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|
2371 public: |
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|
2372 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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2373 AbstractGangTask("Enqueue reference objects in parallel"), |
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2374 _enq_task(enq_task) { } |
2174
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2375 |
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2376 virtual void work(uint worker_id) { |
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|
2377 _enq_task.work(worker_id); |
2174
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|
2378 } |
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|
2379 }; |
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|
2380 |
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|
2381 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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2382 assert(_workers != NULL, "Need parallel worker threads."); |
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2383 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
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2384 |
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2385 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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|
2386 |
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2387 _g1h->set_par_threads(_active_workers); |
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|
2388 _workers->run_task(&enq_task_proxy); |
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|
2389 _g1h->set_par_threads(0); |
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|
2390 } |
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|
2391 |
342 | 2392 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2393 ResourceMark rm; | |
2394 HandleMark hm; | |
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2395 |
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2396 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2397 |
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|
2398 // Is alive closure. |
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|
2399 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2400 |
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2401 // Inner scope to exclude the cleaning of the string and symbol |
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|
2402 // tables from the displayed time. |
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|
2403 { |
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2404 if (G1Log::finer()) { |
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|
2405 gclog_or_tty->put(' '); |
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|
2406 } |
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2407 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
3975
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2408 |
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2409 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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|
2410 |
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2411 // See the comment in G1CollectedHeap::ref_processing_init() |
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2412 // about how reference processing currently works in G1. |
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|
2413 |
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2414 // Set the soft reference policy |
3975
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|
2415 rp->setup_policy(clear_all_soft_refs); |
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|
2416 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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|
2417 |
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2418 // Non-MT instances 'Keep Alive' and 'Complete GC' oop closures. |
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2419 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0)); |
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2420 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), false); |
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2421 |
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|
2422 // We need at least one active thread. If reference processing is |
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2423 // not multi-threaded we use the current (ConcurrentMarkThread) thread, |
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2424 // otherwise we use the work gang from the G1CollectedHeap and we |
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2425 // utilize all the worker threads we can. |
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2426 uint active_workers = (rp->processing_is_mt() && g1h->workers() != NULL |
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2427 ? g1h->workers()->active_workers() |
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|
2428 : 1U); |
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|
2429 |
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2430 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
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2431 |
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2432 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
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2433 g1h->workers(), active_workers); |
3975
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2434 |
8014
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2435 AbstractRefProcTaskExecutor* executor = (rp->processing_is_mt() |
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2436 ? &par_task_executor |
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2437 : NULL); |
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|
2438 |
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2439 // Set the degree of MT processing here. If the discovery was done MT, |
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2440 // the number of threads involved during discovery could differ from |
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2441 // the number of active workers. This is OK as long as the discovered |
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2442 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
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2443 rp->set_active_mt_degree(active_workers); |
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|
2444 |
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2445 // Process the weak references. |
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|
2446 rp->process_discovered_references(&g1_is_alive, |
2174
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2447 &g1_keep_alive, |
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|
2448 &g1_drain_mark_stack, |
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|
2449 executor); |
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|
2450 |
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|
2451 // The do_oop work routines of the keep_alive and drain_marking_stack |
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2452 // oop closures will set the has_overflown flag if we overflow the |
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|
2453 // global marking stack. |
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|
2454 |
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|
2455 assert(_markStack.overflow() || _markStack.isEmpty(), |
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|
2456 "mark stack should be empty (unless it overflowed)"); |
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|
2457 if (_markStack.overflow()) { |
8014
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2458 // This should have been done already when we tried to push an |
3975
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|
2459 // entry on to the global mark stack. But let's do it again. |
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|
2460 set_has_overflown(); |
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|
2461 } |
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|
2462 |
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|
2463 assert(rp->num_q() == active_workers, "why not"); |
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|
2464 |
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|
2465 rp->enqueue_discovered_references(executor); |
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|
2466 |
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|
2467 rp->verify_no_references_recorded(); |
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|
2468 assert(!rp->discovery_enabled(), "Post condition"); |
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|
2469 } |
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|
2470 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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|
2471 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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|
2472 StringTable::unlink(&g1_is_alive); |
2177
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|
2473 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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|
2474 SymbolTable::unlink(); |
342 | 2475 } |
2476 | |
2477 void ConcurrentMark::swapMarkBitMaps() { | |
2478 CMBitMapRO* temp = _prevMarkBitMap; | |
2479 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2480 _nextMarkBitMap = (CMBitMap*) temp; | |
2481 } | |
2482 | |
2483 class CMRemarkTask: public AbstractGangTask { | |
2484 private: | |
2485 ConcurrentMark *_cm; | |
2486 | |
2487 public: | |
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|
2488 void work(uint worker_id) { |
342 | 2489 // Since all available tasks are actually started, we should |
2490 // only proceed if we're supposed to be actived. | |
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|
2491 if (worker_id < _cm->active_tasks()) { |
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|
2492 CMTask* task = _cm->task(worker_id); |
342 | 2493 task->record_start_time(); |
2494 do { | |
2174
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2495 task->do_marking_step(1000000000.0 /* something very large */, |
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|
2496 true /* do_stealing */, |
234761c55641
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|
2497 true /* do_termination */); |
342 | 2498 } while (task->has_aborted() && !_cm->has_overflown()); |
2499 // If we overflow, then we do not want to restart. We instead | |
2500 // want to abort remark and do concurrent marking again. | |
2501 task->record_end_time(); | |
2502 } | |
2503 } | |
2504 | |
4711 | 2505 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
2506 AbstractGangTask("Par Remark"), _cm(cm) { |
4711 | 2507 _cm->terminator()->reset_for_reuse(active_workers); |
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bca17e38de00
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|
2508 } |
342 | 2509 }; |
2510 | |
2511 void ConcurrentMark::checkpointRootsFinalWork() { | |
2512 ResourceMark rm; | |
2513 HandleMark hm; | |
2514 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2515 | |
2516 g1h->ensure_parsability(false); | |
2517 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1719
diff
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|
2518 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
2519 G1CollectedHeap::StrongRootsScope srs(g1h); |
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|
2520 // this is remark, so we'll use up all active threads |
4728
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|
2521 uint active_workers = g1h->workers()->active_workers(); |
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|
2522 if (active_workers == 0) { |
bca17e38de00
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|
2523 assert(active_workers > 0, "Should have been set earlier"); |
4728
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|
2524 active_workers = (uint) ParallelGCThreads; |
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|
2525 g1h->workers()->set_active_workers(active_workers); |
bca17e38de00
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|
2526 } |
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|
2527 set_phase(active_workers, false /* concurrent */); |
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|
2528 // Leave _parallel_marking_threads at it's |
bca17e38de00
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diff
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|
2529 // value originally calculated in the ConcurrentMark |
bca17e38de00
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|
2530 // constructor and pass values of the active workers |
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|
2531 // through the gang in the task. |
342 | 2532 |
4711 | 2533 CMRemarkTask remarkTask(this, active_workers); |
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|
2534 g1h->set_par_threads(active_workers); |
342 | 2535 g1h->workers()->run_task(&remarkTask); |
2536 g1h->set_par_threads(0); | |
2537 } else { | |
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|
2538 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2539 // this is remark, so we'll use up all available threads |
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|
2540 uint active_workers = 1; |
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|
2541 set_phase(active_workers, false /* concurrent */); |
342 | 2542 |
4711 | 2543 CMRemarkTask remarkTask(this, active_workers); |
342 | 2544 // We will start all available threads, even if we decide that the |
2545 // active_workers will be fewer. The extra ones will just bail out | |
2546 // immediately. | |
2547 remarkTask.work(0); | |
2548 } | |
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|
2549 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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|
2550 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2551 |
2552 print_stats(); | |
2553 } | |
2554 | |
1044 | 2555 #ifndef PRODUCT |
2556 | |
1388 | 2557 class PrintReachableOopClosure: public OopClosure { |
342 | 2558 private: |
2559 G1CollectedHeap* _g1h; | |
2560 outputStream* _out; | |
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|
2561 VerifyOption _vo; |
1388 | 2562 bool _all; |
342 | 2563 |
2564 public: | |
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|
2565 PrintReachableOopClosure(outputStream* out, |
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|
2566 VerifyOption vo, |
1388 | 2567 bool all) : |
1044 | 2568 _g1h(G1CollectedHeap::heap()), |
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|
2569 _out(out), _vo(vo), _all(all) { } |
342 | 2570 |
845
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|
2571 void do_oop(narrowOop* p) { do_oop_work(p); } |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2572 void do_oop( oop* p) { do_oop_work(p); } |
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|
2573 |
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|
2574 template <class T> void do_oop_work(T* p) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2575 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2576 const char* str = NULL; |
2577 const char* str2 = ""; | |
2578 | |
1388 | 2579 if (obj == NULL) { |
2580 str = ""; | |
2581 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2582 str = " O"; | |
2583 } else { | |
342 | 2584 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
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|
2585 guarantee(hr != NULL, "invariant"); |
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|
2586 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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|
2587 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2588 |
2589 if (over_tams) { | |
1388 | 2590 str = " >"; |
2591 if (marked) { | |
342 | 2592 str2 = " AND MARKED"; |
1044 | 2593 } |
1388 | 2594 } else if (marked) { |
2595 str = " M"; | |
1044 | 2596 } else { |
1388 | 2597 str = " NOT"; |
1044 | 2598 } |
342 | 2599 } |
2600 | |
1388 | 2601 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2602 p, (void*) obj, str, str2); |
2603 } | |
2604 }; | |
2605 | |
1388 | 2606 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2607 private: |
3772
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|
2608 G1CollectedHeap* _g1h; |
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|
2609 outputStream* _out; |
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|
2610 VerifyOption _vo; |
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|
2611 bool _all; |
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|
2612 HeapRegion* _hr; |
342 | 2613 |
2614 public: | |
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|
2615 PrintReachableObjectClosure(outputStream* out, |
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|
2616 VerifyOption vo, |
1388 | 2617 bool all, |
2618 HeapRegion* hr) : | |
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|
2619 _g1h(G1CollectedHeap::heap()), |
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|
2620 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2621 |
2622 void do_object(oop o) { | |
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2623 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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2624 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2625 bool print_it = _all || over_tams || marked; |
2626 | |
2627 if (print_it) { | |
2628 _out->print_cr(" "PTR_FORMAT"%s", | |
2629 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
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2630 PrintReachableOopClosure oopCl(_out, _vo, _all); |
6725
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2631 o->oop_iterate_no_header(&oopCl); |
1388 | 2632 } |
342 | 2633 } |
2634 }; | |
2635 | |
1388 | 2636 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2637 private: |
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2638 G1CollectedHeap* _g1h; |
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2639 outputStream* _out; |
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2640 VerifyOption _vo; |
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2641 bool _all; |
342 | 2642 |
2643 public: | |
2644 bool doHeapRegion(HeapRegion* hr) { | |
2645 HeapWord* b = hr->bottom(); | |
2646 HeapWord* e = hr->end(); | |
2647 HeapWord* t = hr->top(); | |
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2648 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2649 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2650 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2651 _out->cr(); |
2652 | |
2653 HeapWord* from = b; | |
2654 HeapWord* to = t; | |
2655 | |
2656 if (to > from) { | |
2657 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2658 _out->cr(); | |
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2659 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2660 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2661 _out->cr(); | |
2662 } | |
342 | 2663 |
2664 return false; | |
2665 } | |
2666 | |
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2667 PrintReachableRegionClosure(outputStream* out, |
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2668 VerifyOption vo, |
1388 | 2669 bool all) : |
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2670 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2671 }; |
2672 | |
1388 | 2673 void ConcurrentMark::print_reachable(const char* str, |
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2674 VerifyOption vo, |
1388 | 2675 bool all) { |
2676 gclog_or_tty->cr(); | |
2677 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2678 |
2679 if (G1PrintReachableBaseFile == NULL) { | |
2680 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2681 return; | |
2682 } | |
2683 | |
2684 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2685 (JVM_MAXPATHLEN - 1)) { | |
2686 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2687 return; | |
2688 } | |
2689 | |
2690 char file_name[JVM_MAXPATHLEN]; | |
2691 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2692 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2693 | |
2694 fileStream fout(file_name); | |
2695 if (!fout.is_open()) { | |
2696 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2697 return; | |
2698 } | |
2699 | |
2700 outputStream* out = &fout; | |
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2701 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2702 out->cr(); |
2703 | |
1388 | 2704 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2705 out->cr(); |
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2706 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2707 _g1h->heap_region_iterate(&rcl); |
1044 | 2708 out->cr(); |
2709 | |
2710 gclog_or_tty->print_cr(" done"); | |
1388 | 2711 gclog_or_tty->flush(); |
342 | 2712 } |
2713 | |
1044 | 2714 #endif // PRODUCT |
2715 | |
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2716 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2717 // Note we are overriding the read-only view of the prev map here, via |
2718 // the cast. | |
2719 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2720 } |
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2721 |
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2722 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2723 _nextMarkBitMap->clearRange(mr); |
2724 } | |
2725 | |
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2726 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2727 clearRangePrevBitmap(mr); |
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2728 clearRangeNextBitmap(mr); |
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2729 } |
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2730 |
342 | 2731 HeapRegion* |
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2732 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2733 // "checkpoint" the finger |
2734 HeapWord* finger = _finger; | |
2735 | |
2736 // _heap_end will not change underneath our feet; it only changes at | |
2737 // yield points. | |
2738 while (finger < _heap_end) { | |
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2739 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2740 |
3771 | 2741 // Note on how this code handles humongous regions. In the |
2742 // normal case the finger will reach the start of a "starts | |
2743 // humongous" (SH) region. Its end will either be the end of the | |
2744 // last "continues humongous" (CH) region in the sequence, or the | |
2745 // standard end of the SH region (if the SH is the only region in | |
2746 // the sequence). That way claim_region() will skip over the CH | |
2747 // regions. However, there is a subtle race between a CM thread | |
2748 // executing this method and a mutator thread doing a humongous | |
2749 // object allocation. The two are not mutually exclusive as the CM | |
2750 // thread does not need to hold the Heap_lock when it gets | |
2751 // here. So there is a chance that claim_region() will come across | |
2752 // a free region that's in the progress of becoming a SH or a CH | |
2753 // region. In the former case, it will either | |
2754 // a) Miss the update to the region's end, in which case it will | |
2755 // visit every subsequent CH region, will find their bitmaps | |
2756 // empty, and do nothing, or | |
2757 // b) Will observe the update of the region's end (in which case | |
2758 // it will skip the subsequent CH regions). | |
2759 // If it comes across a region that suddenly becomes CH, the | |
2760 // scenario will be similar to b). So, the race between | |
2761 // claim_region() and a humongous object allocation might force us | |
2762 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2763 // iterations) but it should not introduce and correctness issues. | |
2764 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2765 HeapWord* bottom = curr_region->bottom(); |
2766 HeapWord* end = curr_region->end(); | |
2767 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2768 | |
3771 | 2769 if (verbose_low()) { |
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2770 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2771 "["PTR_FORMAT", "PTR_FORMAT"), " |
2772 "limit = "PTR_FORMAT, | |
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2773 worker_id, curr_region, bottom, end, limit); |
3771 | 2774 } |
2775 | |
2776 // Is the gap between reading the finger and doing the CAS too long? | |
2777 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2778 if (res == finger) { |
2779 // we succeeded | |
2780 | |
2781 // notice that _finger == end cannot be guaranteed here since, | |
2782 // someone else might have moved the finger even further | |
1023
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2783 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2784 |
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2785 if (verbose_low()) { |
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2786 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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2787 PTR_FORMAT, worker_id, curr_region); |
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2788 } |
342 | 2789 |
2790 if (limit > bottom) { | |
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2791 if (verbose_low()) { |
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2792 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2793 "returning it ", worker_id, curr_region); |
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2794 } |
342 | 2795 return curr_region; |
2796 } else { | |
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2797 assert(limit == bottom, |
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2798 "the region limit should be at bottom"); |
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2799 if (verbose_low()) { |
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2800 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2801 "returning NULL", worker_id, curr_region); |
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2802 } |
342 | 2803 // we return NULL and the caller should try calling |
2804 // claim_region() again. | |
2805 return NULL; | |
2806 } | |
2807 } else { | |
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2808 assert(_finger > finger, "the finger should have moved forward"); |
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2809 if (verbose_low()) { |
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2810 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 2811 "global finger = "PTR_FORMAT", " |
2812 "our finger = "PTR_FORMAT, | |
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2813 worker_id, _finger, finger); |
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2814 } |
342 | 2815 |
2816 // read it again | |
2817 finger = _finger; | |
2818 } | |
2819 } | |
2820 | |
2821 return NULL; | |
2822 } | |
2823 | |
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2824 #ifndef PRODUCT |
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2825 enum VerifyNoCSetOopsPhase { |
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2826 VerifyNoCSetOopsStack, |
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2827 VerifyNoCSetOopsQueues, |
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2828 VerifyNoCSetOopsSATBCompleted, |
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2829 VerifyNoCSetOopsSATBThread |
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2830 }; |
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2831 |
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2832 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2833 private: |
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2834 G1CollectedHeap* _g1h; |
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2835 VerifyNoCSetOopsPhase _phase; |
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2836 int _info; |
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2837 |
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2838 const char* phase_str() { |
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2839 switch (_phase) { |
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2840 case VerifyNoCSetOopsStack: return "Stack"; |
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2841 case VerifyNoCSetOopsQueues: return "Queue"; |
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2842 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2843 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2844 default: ShouldNotReachHere(); |
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2845 } |
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2846 return NULL; |
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2847 } |
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2848 |
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2849 void do_object_work(oop obj) { |
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2850 guarantee(!_g1h->obj_in_cs(obj), |
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2851 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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2852 (void*) obj, phase_str(), _info)); |
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2853 } |
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2854 |
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2855 public: |
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2856 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2857 |
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2858 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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2859 _phase = phase; |
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2860 _info = info; |
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2861 } |
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2862 |
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|
2863 virtual void do_oop(oop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2864 oop obj = oopDesc::load_decode_heap_oop(p); |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2865 do_object_work(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2866 } |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2867 |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2868 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
2869 // We should not come across narrow oops while scanning marking |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2870 // stacks and SATB buffers. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2871 ShouldNotReachHere(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2872 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2873 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2874 virtual void do_object(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2875 do_object_work(obj); |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
2876 } |
2ace1c4ee8da
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parents:
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diff
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|
2877 }; |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
2878 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2879 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2880 bool verify_enqueued_buffers, |
2ace1c4ee8da
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tonyp
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diff
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|
2881 bool verify_thread_buffers, |
2ace1c4ee8da
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parents:
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diff
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|
2882 bool verify_fingers) { |
2ace1c4ee8da
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diff
changeset
|
2883 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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parents:
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|
2884 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2885 return; |
342 | 2886 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
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|
2887 |
4787
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|
2888 VerifyNoCSetOopsClosure cl; |
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tonyp
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diff
changeset
|
2889 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2890 if (verify_stacks) { |
2ace1c4ee8da
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diff
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|
2891 // Verify entries on the global mark stack |
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|
2892 cl.set_phase(VerifyNoCSetOopsStack); |
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diff
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|
2893 _markStack.oops_do(&cl); |
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parents:
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changeset
|
2894 |
2ace1c4ee8da
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diff
changeset
|
2895 // Verify entries on the task queues |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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diff
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|
2896 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2897 cl.set_phase(VerifyNoCSetOopsQueues, i); |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
2898 CMTaskQueue* queue = _task_queues->queue(i); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2899 queue->oops_do(&cl); |
2ace1c4ee8da
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parents:
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diff
changeset
|
2900 } |
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parents:
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diff
changeset
|
2901 } |
2ace1c4ee8da
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parents:
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diff
changeset
|
2902 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2903 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2904 |
2ace1c4ee8da
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parents:
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diff
changeset
|
2905 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2906 if (verify_enqueued_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2907 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2908 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2909 } |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
2910 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2911 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2912 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2913 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2914 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
|
2915 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2916 |
4787
2ace1c4ee8da
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parents:
4783
diff
changeset
|
2917 if (verify_fingers) { |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
2918 // Verify the global finger |
2ace1c4ee8da
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parents:
4783
diff
changeset
|
2919 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2920 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
|
2921 // 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
|
2922 // 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
|
2923 // 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
|
2924 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2925 // 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
|
2926 // 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
|
2927 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2928 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
|
2929 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2930 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
|
2931 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2932 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2933 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2934 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2935 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
|
2936 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
|
2937 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2938 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2939 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
|
2940 // 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
|
2941 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
|
2942 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2943 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2944 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
|
2945 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2946 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2947 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2948 } |
342 | 2949 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2950 #endif // PRODUCT |
342 | 2951 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2952 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2953 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2954 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2955 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2956 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2957 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2958 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2959 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2960 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2961 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2962 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2963 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2964 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2965 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2966 _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
|
2967 _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
|
2968 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2969 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2970 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2971 // 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
|
2972 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2973 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2974 // "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
|
2975 // 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
|
2976 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2977 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2978 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2979 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2980 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2981 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2984 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2985 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
|
2986 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2987 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2989 start, limit, hr->top(), hr->end())); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2992 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2993 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2994 // 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
|
2995 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2996 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2997 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2998 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2999 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
|
3000 // '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
|
3001 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
|
3002 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3003 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
|
3004 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
|
3005 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
|
3006 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3007 // 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
|
3008 // 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
|
3009 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3010 // 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
|
3011 // 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
|
3012 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3013 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3014 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
|
3015 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3016 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3017 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3018 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3019 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3020 // 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
|
3021 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3022 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3023 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3024 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
|
3025 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
|
3026 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
|
3027 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3028 // 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
|
3029 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3030 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3031 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3032 // 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
|
3033 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3034 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3035 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3036 while (scan_idx < limit_idx) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3037 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3038 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3039 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3040 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3041 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3042 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3043 // parameter. It does, however, have an early exit if |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3044 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3045 // passed in for left offset here. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3046 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3047 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3049 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3050 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3051 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3052 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3054 // Next heap region |
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 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3058 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3059 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3060 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3061 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3062 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3063 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3064 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3065 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3066 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3067 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3068 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3069 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3070 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3071 uint max_worker_id, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3072 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3073 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3074 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3075 _max_worker_id(max_worker_id), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3076 _active_workers(n_workers) { } |
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 void work(uint worker_id) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3079 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3080 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3081 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3082 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3083 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3084 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3085 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3086 _g1h->heap_region_iterate(&cl); |
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 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3089 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3090 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3091 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3092 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3093 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3094 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3095 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3096 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3097 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3098 _max_worker_id, n_workers); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3099 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3100 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3101 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3102 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3103 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3104 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3105 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3106 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3107 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3108 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3109 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3110 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3111 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3112 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
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3113 } |
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3114 |
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3115 // Clear the per-worker arrays used to store the per-region counting data |
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3116 void ConcurrentMark::clear_all_count_data() { |
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3117 // Clear the global card bitmap - it will be filled during |
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3118 // liveness count aggregation (during remark) and the |
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3119 // final counting task. |
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3120 _card_bm.clear(); |
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3121 |
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3122 // Clear the global region bitmap - it will be filled as part |
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3123 // of the final counting task. |
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3124 _region_bm.clear(); |
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3125 |
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3126 uint max_regions = _g1h->max_regions(); |
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3127 assert(_max_worker_id > 0, "uninitialized"); |
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3128 |
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3129 for (uint i = 0; i < _max_worker_id; i += 1) { |
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3130 BitMap* task_card_bm = count_card_bitmap_for(i); |
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3131 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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3132 |
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3133 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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3134 assert(marked_bytes_array != NULL, "uninitialized"); |
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3135 |
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3136 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
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3137 task_card_bm->clear(); |
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3138 } |
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3139 } |
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3140 |
342 | 3141 void ConcurrentMark::print_stats() { |
3142 if (verbose_stats()) { | |
3143 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3144 for (size_t i = 0; i < _active_tasks; ++i) { | |
3145 _tasks[i]->print_stats(); | |
3146 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3147 } | |
3148 } | |
3149 } | |
3150 | |
3151 // abandon current marking iteration due to a Full GC | |
3152 void ConcurrentMark::abort() { | |
3153 // Clear all marks to force marking thread to do nothing | |
3154 _nextMarkBitMap->clearAll(); | |
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3155 // Clear the liveness counting data |
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3156 clear_all_count_data(); |
342 | 3157 // Empty mark stack |
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3158 reset_marking_state(); |
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3159 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3160 _tasks[i]->clear_region_fields(); |
1835
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3161 } |
342 | 3162 _has_aborted = true; |
3163 | |
3164 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3165 satb_mq_set.abandon_partial_marking(); | |
1317
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3166 // This can be called either during or outside marking, we'll read |
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3167 // the expected_active value from the SATB queue set. |
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3168 satb_mq_set.set_active_all_threads( |
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3169 false, /* new active value */ |
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3170 satb_mq_set.is_active() /* expected_active */); |
342 | 3171 } |
3172 | |
3173 static void print_ms_time_info(const char* prefix, const char* name, | |
3174 NumberSeq& ns) { | |
3175 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3176 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3177 if (ns.num() > 0) { | |
3178 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3179 prefix, ns.sd(), ns.maximum()); | |
3180 } | |
3181 } | |
3182 | |
3183 void ConcurrentMark::print_summary_info() { | |
3184 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3185 print_ms_time_info(" ", "init marks", _init_times); | |
3186 print_ms_time_info(" ", "remarks", _remark_times); | |
3187 { | |
3188 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3189 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3190 | |
3191 } | |
3192 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3193 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3194 _total_counting_time, | |
3195 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3196 (double)_cleanup_times.num() | |
3197 : 0.0)); | |
3198 if (G1ScrubRemSets) { | |
3199 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3200 _total_rs_scrub_time, | |
3201 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3202 (double)_cleanup_times.num() | |
3203 : 0.0)); | |
3204 } | |
3205 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3206 (_init_times.sum() + _remark_times.sum() + | |
3207 _cleanup_times.sum())/1000.0); | |
3208 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3209 "(%8.2f s marking).", |
342 | 3210 cmThread()->vtime_accum(), |
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3211 cmThread()->vtime_mark_accum()); |
342 | 3212 } |
3213 | |
1019 | 3214 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
8008
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3215 if (use_parallel_marking_threads()) { |
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3216 _parallel_workers->print_worker_threads_on(st); |
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3217 } |
1019 | 3218 } |
3219 | |
342 | 3220 // We take a break if someone is trying to stop the world. |
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3221 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3222 if (should_yield()) { |
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3223 if (worker_id == 0) { |
342 | 3224 _g1h->g1_policy()->record_concurrent_pause(); |
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3225 } |
342 | 3226 cmThread()->yield(); |
3227 return true; | |
3228 } else { | |
3229 return false; | |
3230 } | |
3231 } | |
3232 | |
3233 bool ConcurrentMark::should_yield() { | |
3234 return cmThread()->should_yield(); | |
3235 } | |
3236 | |
3237 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3238 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3239 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3240 } | |
3241 | |
3242 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3243 void* last) { | |
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3244 return containing_card_is_marked(start) && |
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3245 containing_card_is_marked(last); |
342 | 3246 } |
3247 | |
3248 #ifndef PRODUCT | |
3249 // for debugging purposes | |
3250 void ConcurrentMark::print_finger() { | |
3251 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3252 _heap_start, _heap_end, _finger); | |
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3253 for (uint i = 0; i < _max_worker_id; ++i) { |
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3254 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
342 | 3255 } |
3256 gclog_or_tty->print_cr(""); | |
3257 } | |
3258 #endif | |
3259 | |
3771 | 3260 void CMTask::scan_object(oop obj) { |
3261 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3262 | |
3263 if (_cm->verbose_high()) { | |
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3264 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
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3265 _worker_id, (void*) obj); |
3771 | 3266 } |
3267 | |
3268 size_t obj_size = obj->size(); | |
3269 _words_scanned += obj_size; | |
3270 | |
3271 obj->oop_iterate(_cm_oop_closure); | |
3272 statsOnly( ++_objs_scanned ); | |
3273 check_limits(); | |
3274 } | |
3275 | |
342 | 3276 // Closure for iteration over bitmaps |
3277 class CMBitMapClosure : public BitMapClosure { | |
3278 private: | |
3279 // the bitmap that is being iterated over | |
3280 CMBitMap* _nextMarkBitMap; | |
3281 ConcurrentMark* _cm; | |
3282 CMTask* _task; | |
3283 | |
3284 public: | |
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3285 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3286 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3287 |
3288 bool do_bit(size_t offset) { | |
3289 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3290 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3291 assert( addr < _cm->finger(), "invariant"); |
342 | 3292 |
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3293 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3294 assert(addr >= _task->finger(), "invariant"); |
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3295 |
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|
3296 // We move that task's local finger along. |
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|
3297 _task->move_finger_to(addr); |
342 | 3298 |
3299 _task->scan_object(oop(addr)); | |
3300 // we only partially drain the local queue and global stack | |
3301 _task->drain_local_queue(true); | |
3302 _task->drain_global_stack(true); | |
3303 | |
3304 // if the has_aborted flag has been raised, we need to bail out of | |
3305 // the iteration | |
3306 return !_task->has_aborted(); | |
3307 } | |
3308 }; | |
3309 | |
3310 // Closure for iterating over objects, currently only used for | |
3311 // processing SATB buffers. | |
3312 class CMObjectClosure : public ObjectClosure { | |
3313 private: | |
3314 CMTask* _task; | |
3315 | |
3316 public: | |
3317 void do_object(oop obj) { | |
3318 _task->deal_with_reference(obj); | |
3319 } | |
3320 | |
3321 CMObjectClosure(CMTask* task) : _task(task) { } | |
3322 }; | |
3323 | |
3771 | 3324 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3325 ConcurrentMark* cm, | |
3326 CMTask* task) | |
3327 : _g1h(g1h), _cm(cm), _task(task) { | |
3328 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3329 | |
3330 if (G1UseConcMarkReferenceProcessing) { | |
3979
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3331 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3332 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3333 } |
3771 | 3334 } |
342 | 3335 |
3336 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3337 // Separated the asserts so that we know which one fires. |
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3338 assert(hr != NULL, |
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3339 "claim_region() should have filtered out continues humongous regions"); |
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3340 assert(!hr->continuesHumongous(), |
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3341 "claim_region() should have filtered out continues humongous regions"); |
342 | 3342 |
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3343 if (_cm->verbose_low()) { |
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3344 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3345 _worker_id, hr); |
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3346 } |
342 | 3347 |
3348 _curr_region = hr; | |
3349 _finger = hr->bottom(); | |
3350 update_region_limit(); | |
3351 } | |
3352 | |
3353 void CMTask::update_region_limit() { | |
3354 HeapRegion* hr = _curr_region; | |
3355 HeapWord* bottom = hr->bottom(); | |
3356 HeapWord* limit = hr->next_top_at_mark_start(); | |
3357 | |
3358 if (limit == bottom) { | |
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3359 if (_cm->verbose_low()) { |
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3360 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3361 "["PTR_FORMAT", "PTR_FORMAT")", |
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3362 _worker_id, bottom, limit); |
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|
3363 } |
342 | 3364 // The region was collected underneath our feet. |
3365 // We set the finger to bottom to ensure that the bitmap | |
3366 // iteration that will follow this will not do anything. | |
3367 // (this is not a condition that holds when we set the region up, | |
3368 // as the region is not supposed to be empty in the first place) | |
3369 _finger = bottom; | |
3370 } else if (limit >= _region_limit) { | |
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3371 assert(limit >= _finger, "peace of mind"); |
342 | 3372 } else { |
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|
3373 assert(limit < _region_limit, "only way to get here"); |
342 | 3374 // This can happen under some pretty unusual circumstances. An |
3375 // evacuation pause empties the region underneath our feet (NTAMS | |
3376 // at bottom). We then do some allocation in the region (NTAMS | |
3377 // stays at bottom), followed by the region being used as a GC | |
3378 // alloc region (NTAMS will move to top() and the objects | |
3379 // originally below it will be grayed). All objects now marked in | |
3380 // the region are explicitly grayed, if below the global finger, | |
3381 // and we do not need in fact to scan anything else. So, we simply | |
3382 // set _finger to be limit to ensure that the bitmap iteration | |
3383 // doesn't do anything. | |
3384 _finger = limit; | |
3385 } | |
3386 | |
3387 _region_limit = limit; | |
3388 } | |
3389 | |
3390 void CMTask::giveup_current_region() { | |
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3391 assert(_curr_region != NULL, "invariant"); |
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3392 if (_cm->verbose_low()) { |
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3393 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3394 _worker_id, _curr_region); |
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3395 } |
342 | 3396 clear_region_fields(); |
3397 } | |
3398 | |
3399 void CMTask::clear_region_fields() { | |
3400 // Values for these three fields that indicate that we're not | |
3401 // holding on to a region. | |
3402 _curr_region = NULL; | |
3403 _finger = NULL; | |
3404 _region_limit = NULL; | |
3405 } | |
3406 | |
3771 | 3407 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3408 if (cm_oop_closure == NULL) { | |
3409 assert(_cm_oop_closure != NULL, "invariant"); | |
3410 } else { | |
3411 assert(_cm_oop_closure == NULL, "invariant"); | |
3412 } | |
3413 _cm_oop_closure = cm_oop_closure; | |
3414 } | |
3415 | |
342 | 3416 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3417 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3418 |
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3419 if (_cm->verbose_low()) { |
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3420 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3421 } |
342 | 3422 |
3423 _nextMarkBitMap = nextMarkBitMap; | |
3424 clear_region_fields(); | |
3425 | |
3426 _calls = 0; | |
3427 _elapsed_time_ms = 0.0; | |
3428 _termination_time_ms = 0.0; | |
3429 _termination_start_time_ms = 0.0; | |
3430 | |
3431 #if _MARKING_STATS_ | |
3432 _local_pushes = 0; | |
3433 _local_pops = 0; | |
3434 _local_max_size = 0; | |
3435 _objs_scanned = 0; | |
3436 _global_pushes = 0; | |
3437 _global_pops = 0; | |
3438 _global_max_size = 0; | |
3439 _global_transfers_to = 0; | |
3440 _global_transfers_from = 0; | |
3441 _regions_claimed = 0; | |
3442 _objs_found_on_bitmap = 0; | |
3443 _satb_buffers_processed = 0; | |
3444 _steal_attempts = 0; | |
3445 _steals = 0; | |
3446 _aborted = 0; | |
3447 _aborted_overflow = 0; | |
3448 _aborted_cm_aborted = 0; | |
3449 _aborted_yield = 0; | |
3450 _aborted_timed_out = 0; | |
3451 _aborted_satb = 0; | |
3452 _aborted_termination = 0; | |
3453 #endif // _MARKING_STATS_ | |
3454 } | |
3455 | |
3456 bool CMTask::should_exit_termination() { | |
3457 regular_clock_call(); | |
3458 // This is called when we are in the termination protocol. We should | |
3459 // quit if, for some reason, this task wants to abort or the global | |
3460 // stack is not empty (this means that we can get work from it). | |
3461 return !_cm->mark_stack_empty() || has_aborted(); | |
3462 } | |
3463 | |
3464 void CMTask::reached_limit() { | |
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3465 assert(_words_scanned >= _words_scanned_limit || |
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3466 _refs_reached >= _refs_reached_limit , |
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3467 "shouldn't have been called otherwise"); |
342 | 3468 regular_clock_call(); |
3469 } | |
3470 | |
3471 void CMTask::regular_clock_call() { | |
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3472 if (has_aborted()) return; |
342 | 3473 |
3474 // First, we need to recalculate the words scanned and refs reached | |
3475 // limits for the next clock call. | |
3476 recalculate_limits(); | |
3477 | |
3478 // During the regular clock call we do the following | |
3479 | |
3480 // (1) If an overflow has been flagged, then we abort. | |
3481 if (_cm->has_overflown()) { | |
3482 set_has_aborted(); | |
3483 return; | |
3484 } | |
3485 | |
3486 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3487 // to check anything else. The other steps are only needed during | |
3488 // the concurrent marking phase. | |
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3489 if (!concurrent()) return; |
342 | 3490 |
3491 // (2) If marking has been aborted for Full GC, then we also abort. | |
3492 if (_cm->has_aborted()) { | |
3493 set_has_aborted(); | |
3494 statsOnly( ++_aborted_cm_aborted ); | |
3495 return; | |
3496 } | |
3497 | |
3498 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3499 | |
3500 // (3) If marking stats are enabled, then we update the step history. | |
3501 #if _MARKING_STATS_ | |
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3502 if (_words_scanned >= _words_scanned_limit) { |
342 | 3503 ++_clock_due_to_scanning; |
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3504 } |
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3505 if (_refs_reached >= _refs_reached_limit) { |
342 | 3506 ++_clock_due_to_marking; |
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3507 } |
342 | 3508 |
3509 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3510 _interval_start_time_ms = curr_time_ms; | |
3511 _all_clock_intervals_ms.add(last_interval_ms); | |
3512 | |
3513 if (_cm->verbose_medium()) { | |
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3514 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
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3515 "scanned = %d%s, refs reached = %d%s", |
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3516 _worker_id, last_interval_ms, |
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3517 _words_scanned, |
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3518 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3519 _refs_reached, |
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3520 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3521 } |
3522 #endif // _MARKING_STATS_ | |
3523 | |
3524 // (4) We check whether we should yield. If we have to, then we abort. | |
3525 if (_cm->should_yield()) { | |
3526 // We should yield. To do this we abort the task. The caller is | |
3527 // responsible for yielding. | |
3528 set_has_aborted(); | |
3529 statsOnly( ++_aborted_yield ); | |
3530 return; | |
3531 } | |
3532 | |
3533 // (5) We check whether we've reached our time quota. If we have, | |
3534 // then we abort. | |
3535 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3536 if (elapsed_time_ms > _time_target_ms) { | |
3537 set_has_aborted(); | |
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3538 _has_timed_out = true; |
342 | 3539 statsOnly( ++_aborted_timed_out ); |
3540 return; | |
3541 } | |
3542 | |
3543 // (6) Finally, we check whether there are enough completed STAB | |
3544 // buffers available for processing. If there are, we abort. | |
3545 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3546 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3547 if (_cm->verbose_low()) { |
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3548 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3549 _worker_id); |
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3550 } |
342 | 3551 // we do need to process SATB buffers, we'll abort and restart |
3552 // the marking task to do so | |
3553 set_has_aborted(); | |
3554 statsOnly( ++_aborted_satb ); | |
3555 return; | |
3556 } | |
3557 } | |
3558 | |
3559 void CMTask::recalculate_limits() { | |
3560 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3561 _words_scanned_limit = _real_words_scanned_limit; | |
3562 | |
3563 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3564 _refs_reached_limit = _real_refs_reached_limit; | |
3565 } | |
3566 | |
3567 void CMTask::decrease_limits() { | |
3568 // This is called when we believe that we're going to do an infrequent | |
3569 // operation which will increase the per byte scanned cost (i.e. move | |
3570 // entries to/from the global stack). It basically tries to decrease the | |
3571 // scanning limit so that the clock is called earlier. | |
3572 | |
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3573 if (_cm->verbose_medium()) { |
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3574 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3575 } |
342 | 3576 |
3577 _words_scanned_limit = _real_words_scanned_limit - | |
3578 3 * words_scanned_period / 4; | |
3579 _refs_reached_limit = _real_refs_reached_limit - | |
3580 3 * refs_reached_period / 4; | |
3581 } | |
3582 | |
3583 void CMTask::move_entries_to_global_stack() { | |
3584 // local array where we'll store the entries that will be popped | |
3585 // from the local queue | |
3586 oop buffer[global_stack_transfer_size]; | |
3587 | |
3588 int n = 0; | |
3589 oop obj; | |
3590 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3591 buffer[n] = obj; | |
3592 ++n; | |
3593 } | |
3594 | |
3595 if (n > 0) { | |
3596 // we popped at least one entry from the local queue | |
3597 | |
3598 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3599 | |
3600 if (!_cm->mark_stack_push(buffer, n)) { | |
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3601 if (_cm->verbose_low()) { |
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3602 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3603 _worker_id); |
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3604 } |
342 | 3605 set_has_aborted(); |
3606 } else { | |
3607 // the transfer was successful | |
3608 | |
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3609 if (_cm->verbose_medium()) { |
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3610 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3611 _worker_id, n); |
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3612 } |
342 | 3613 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3614 if (tmp_size > _global_max_size) { |
342 | 3615 _global_max_size = tmp_size; |
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3616 } |
342 | 3617 _global_pushes += n ); |
3618 } | |
3619 } | |
3620 | |
3621 // this operation was quite expensive, so decrease the limits | |
3622 decrease_limits(); | |
3623 } | |
3624 | |
3625 void CMTask::get_entries_from_global_stack() { | |
3626 // local array where we'll store the entries that will be popped | |
3627 // from the global stack. | |
3628 oop buffer[global_stack_transfer_size]; | |
3629 int n; | |
3630 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3631 assert(n <= global_stack_transfer_size, |
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3632 "we should not pop more than the given limit"); |
342 | 3633 if (n > 0) { |
3634 // yes, we did actually pop at least one entry | |
3635 | |
3636 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3637 if (_cm->verbose_medium()) { |
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3638 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3639 _worker_id, n); |
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3640 } |
342 | 3641 for (int i = 0; i < n; ++i) { |
3642 bool success = _task_queue->push(buffer[i]); | |
3643 // We only call this when the local queue is empty or under a | |
3644 // given target limit. So, we do not expect this push to fail. | |
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3645 assert(success, "invariant"); |
342 | 3646 } |
3647 | |
3648 statsOnly( int tmp_size = _task_queue->size(); | |
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3649 if (tmp_size > _local_max_size) { |
342 | 3650 _local_max_size = tmp_size; |
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3651 } |
342 | 3652 _local_pushes += n ); |
3653 } | |
3654 | |
3655 // this operation was quite expensive, so decrease the limits | |
3656 decrease_limits(); | |
3657 } | |
3658 | |
3659 void CMTask::drain_local_queue(bool partially) { | |
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3660 if (has_aborted()) return; |
342 | 3661 |
3662 // Decide what the target size is, depending whether we're going to | |
3663 // drain it partially (so that other tasks can steal if they run out | |
3664 // of things to do) or totally (at the very end). | |
3665 size_t target_size; | |
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3666 if (partially) { |
342 | 3667 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3668 } else { |
342 | 3669 target_size = 0; |
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3670 } |
342 | 3671 |
3672 if (_task_queue->size() > target_size) { | |
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3673 if (_cm->verbose_high()) { |
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3674 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
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3675 _worker_id, target_size); |
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3676 } |
342 | 3677 |
3678 oop obj; | |
3679 bool ret = _task_queue->pop_local(obj); | |
3680 while (ret) { | |
3681 statsOnly( ++_local_pops ); | |
3682 | |
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3683 if (_cm->verbose_high()) { |
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3684 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
342 | 3685 (void*) obj); |
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3686 } |
342 | 3687 |
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3688 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3689 assert(!_g1h->is_on_master_free_list( |
2152 | 3690 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3691 |
3692 scan_object(obj); | |
3693 | |
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3694 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3695 ret = false; |
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3696 } else { |
342 | 3697 ret = _task_queue->pop_local(obj); |
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3698 } |
342 | 3699 } |
3700 | |
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3701 if (_cm->verbose_high()) { |
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3702 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3703 _worker_id, _task_queue->size()); |
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3704 } |
342 | 3705 } |
3706 } | |
3707 | |
3708 void CMTask::drain_global_stack(bool partially) { | |
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3709 if (has_aborted()) return; |
342 | 3710 |
3711 // We have a policy to drain the local queue before we attempt to | |
3712 // drain the global stack. | |
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3713 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3714 |
3715 // Decide what the target size is, depending whether we're going to | |
3716 // drain it partially (so that other tasks can steal if they run out | |
3717 // of things to do) or totally (at the very end). Notice that, | |
3718 // because we move entries from the global stack in chunks or | |
3719 // because another task might be doing the same, we might in fact | |
3720 // drop below the target. But, this is not a problem. | |
3721 size_t target_size; | |
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3722 if (partially) { |
342 | 3723 target_size = _cm->partial_mark_stack_size_target(); |
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3724 } else { |
342 | 3725 target_size = 0; |
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3726 } |
342 | 3727 |
3728 if (_cm->mark_stack_size() > target_size) { | |
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3729 if (_cm->verbose_low()) { |
6862
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3730 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
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3731 _worker_id, target_size); |
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3732 } |
342 | 3733 |
3734 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3735 get_entries_from_global_stack(); | |
3736 drain_local_queue(partially); | |
3737 } | |
3738 | |
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3739 if (_cm->verbose_low()) { |
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3740 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
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3741 _worker_id, _cm->mark_stack_size()); |
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3742 } |
342 | 3743 } |
3744 } | |
3745 | |
3746 // SATB Queue has several assumptions on whether to call the par or | |
3747 // non-par versions of the methods. this is why some of the code is | |
3748 // replicated. We should really get rid of the single-threaded version | |
3749 // of the code to simplify things. | |
3750 void CMTask::drain_satb_buffers() { | |
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3751 if (has_aborted()) return; |
342 | 3752 |
3753 // We set this so that the regular clock knows that we're in the | |
3754 // middle of draining buffers and doesn't set the abort flag when it | |
3755 // notices that SATB buffers are available for draining. It'd be | |
3756 // very counter productive if it did that. :-) | |
3757 _draining_satb_buffers = true; | |
3758 | |
3759 CMObjectClosure oc(this); | |
3760 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3761 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6862
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3762 satb_mq_set.set_par_closure(_worker_id, &oc); |
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3763 } else { |
342 | 3764 satb_mq_set.set_closure(&oc); |
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3765 } |
342 | 3766 |
3767 // This keeps claiming and applying the closure to completed buffers | |
3768 // until we run out of buffers or we need to abort. | |
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3769 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3770 while (!has_aborted() && |
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3771 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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3772 if (_cm->verbose_medium()) { |
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3773 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3774 } |
342 | 3775 statsOnly( ++_satb_buffers_processed ); |
3776 regular_clock_call(); | |
3777 } | |
3778 } else { | |
3779 while (!has_aborted() && | |
3780 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3781 if (_cm->verbose_medium()) { |
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3782 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3783 } |
342 | 3784 statsOnly( ++_satb_buffers_processed ); |
3785 regular_clock_call(); | |
3786 } | |
3787 } | |
3788 | |
3789 if (!concurrent() && !has_aborted()) { | |
3790 // We should only do this during remark. | |
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3791 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3792 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
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3793 } else { |
342 | 3794 satb_mq_set.iterate_closure_all_threads(); |
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3795 } |
342 | 3796 } |
3797 | |
3798 _draining_satb_buffers = false; | |
3799 | |
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3800 assert(has_aborted() || |
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3801 concurrent() || |
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3802 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3803 |
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3804 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3805 satb_mq_set.set_par_closure(_worker_id, NULL); |
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3806 } else { |
342 | 3807 satb_mq_set.set_closure(NULL); |
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3808 } |
342 | 3809 |
3810 // again, this was a potentially expensive operation, decrease the | |
3811 // limits to get the regular clock call early | |
3812 decrease_limits(); | |
3813 } | |
3814 | |
3815 void CMTask::print_stats() { | |
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3816 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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3817 _worker_id, _calls); |
342 | 3818 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
3819 _elapsed_time_ms, _termination_time_ms); | |
3820 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3821 _step_times_ms.num(), _step_times_ms.avg(), | |
3822 _step_times_ms.sd()); | |
3823 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3824 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3825 | |
3826 #if _MARKING_STATS_ | |
3827 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3828 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3829 _all_clock_intervals_ms.sd()); | |
3830 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3831 _all_clock_intervals_ms.maximum(), | |
3832 _all_clock_intervals_ms.sum()); | |
3833 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3834 _clock_due_to_scanning, _clock_due_to_marking); | |
3835 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3836 _objs_scanned, _objs_found_on_bitmap); | |
3837 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3838 _local_pushes, _local_pops, _local_max_size); | |
3839 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3840 _global_pushes, _global_pops, _global_max_size); | |
3841 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3842 _global_transfers_to,_global_transfers_from); | |
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3843 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3844 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3845 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3846 _steal_attempts, _steals); | |
3847 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3848 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3849 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3850 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3851 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3852 #endif // _MARKING_STATS_ | |
3853 } | |
3854 | |
3855 /***************************************************************************** | |
3856 | |
3857 The do_marking_step(time_target_ms) method is the building block | |
3858 of the parallel marking framework. It can be called in parallel | |
3859 with other invocations of do_marking_step() on different tasks | |
3860 (but only one per task, obviously) and concurrently with the | |
3861 mutator threads, or during remark, hence it eliminates the need | |
3862 for two versions of the code. When called during remark, it will | |
3863 pick up from where the task left off during the concurrent marking | |
3864 phase. Interestingly, tasks are also claimable during evacuation | |
3865 pauses too, since do_marking_step() ensures that it aborts before | |
3866 it needs to yield. | |
3867 | |
3868 The data structures that is uses to do marking work are the | |
3869 following: | |
3870 | |
3871 (1) Marking Bitmap. If there are gray objects that appear only | |
3872 on the bitmap (this happens either when dealing with an overflow | |
3873 or when the initial marking phase has simply marked the roots | |
3874 and didn't push them on the stack), then tasks claim heap | |
3875 regions whose bitmap they then scan to find gray objects. A | |
3876 global finger indicates where the end of the last claimed region | |
3877 is. A local finger indicates how far into the region a task has | |
3878 scanned. The two fingers are used to determine how to gray an | |
3879 object (i.e. whether simply marking it is OK, as it will be | |
3880 visited by a task in the future, or whether it needs to be also | |
3881 pushed on a stack). | |
3882 | |
3883 (2) Local Queue. The local queue of the task which is accessed | |
3884 reasonably efficiently by the task. Other tasks can steal from | |
3885 it when they run out of work. Throughout the marking phase, a | |
3886 task attempts to keep its local queue short but not totally | |
3887 empty, so that entries are available for stealing by other | |
3888 tasks. Only when there is no more work, a task will totally | |
3889 drain its local queue. | |
3890 | |
3891 (3) Global Mark Stack. This handles local queue overflow. During | |
3892 marking only sets of entries are moved between it and the local | |
3893 queues, as access to it requires a mutex and more fine-grain | |
3894 interaction with it which might cause contention. If it | |
3895 overflows, then the marking phase should restart and iterate | |
3896 over the bitmap to identify gray objects. Throughout the marking | |
3897 phase, tasks attempt to keep the global mark stack at a small | |
3898 length but not totally empty, so that entries are available for | |
3899 popping by other tasks. Only when there is no more work, tasks | |
3900 will totally drain the global mark stack. | |
3901 | |
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3902 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 3903 made available. Buffers are regularly removed from this queue |
3904 and scanned for roots, so that the queue doesn't get too | |
3905 long. During remark, all completed buffers are processed, as | |
3906 well as the filled in parts of any uncompleted buffers. | |
3907 | |
3908 The do_marking_step() method tries to abort when the time target | |
3909 has been reached. There are a few other cases when the | |
3910 do_marking_step() method also aborts: | |
3911 | |
3912 (1) When the marking phase has been aborted (after a Full GC). | |
3913 | |
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3914 (2) When a global overflow (on the global stack) has been |
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3915 triggered. Before the task aborts, it will actually sync up with |
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3916 the other tasks to ensure that all the marking data structures |
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3917 (local queues, stacks, fingers etc.) are re-initialised so that |
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3918 when do_marking_step() completes, the marking phase can |
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3919 immediately restart. |
342 | 3920 |
3921 (3) When enough completed SATB buffers are available. The | |
3922 do_marking_step() method only tries to drain SATB buffers right | |
3923 at the beginning. So, if enough buffers are available, the | |
3924 marking step aborts and the SATB buffers are processed at | |
3925 the beginning of the next invocation. | |
3926 | |
3927 (4) To yield. when we have to yield then we abort and yield | |
3928 right at the end of do_marking_step(). This saves us from a lot | |
3929 of hassle as, by yielding we might allow a Full GC. If this | |
3930 happens then objects will be compacted underneath our feet, the | |
3931 heap might shrink, etc. We save checking for this by just | |
3932 aborting and doing the yield right at the end. | |
3933 | |
3934 From the above it follows that the do_marking_step() method should | |
3935 be called in a loop (or, otherwise, regularly) until it completes. | |
3936 | |
3937 If a marking step completes without its has_aborted() flag being | |
3938 true, it means it has completed the current marking phase (and | |
3939 also all other marking tasks have done so and have all synced up). | |
3940 | |
3941 A method called regular_clock_call() is invoked "regularly" (in | |
3942 sub ms intervals) throughout marking. It is this clock method that | |
3943 checks all the abort conditions which were mentioned above and | |
3944 decides when the task should abort. A work-based scheme is used to | |
3945 trigger this clock method: when the number of object words the | |
3946 marking phase has scanned or the number of references the marking | |
3947 phase has visited reach a given limit. Additional invocations to | |
3948 the method clock have been planted in a few other strategic places | |
3949 too. The initial reason for the clock method was to avoid calling | |
3950 vtime too regularly, as it is quite expensive. So, once it was in | |
3951 place, it was natural to piggy-back all the other conditions on it | |
3952 too and not constantly check them throughout the code. | |
3953 | |
3954 *****************************************************************************/ | |
3955 | |
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3956 void CMTask::do_marking_step(double time_target_ms, |
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3957 bool do_stealing, |
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3958 bool do_termination) { |
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3959 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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3960 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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3961 |
342 | 3962 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
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3963 assert(_task_queues != NULL, "invariant"); |
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3964 assert(_task_queue != NULL, "invariant"); |
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3965 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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3966 |
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3967 assert(!_claimed, |
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3968 "only one thread should claim this task at any one time"); |
342 | 3969 |
3970 // OK, this doesn't safeguard again all possible scenarios, as it is | |
3971 // possible for two threads to set the _claimed flag at the same | |
3972 // time. But it is only for debugging purposes anyway and it will | |
3973 // catch most problems. | |
3974 _claimed = true; | |
3975 | |
3976 _start_time_ms = os::elapsedVTime() * 1000.0; | |
3977 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
3978 | |
3979 double diff_prediction_ms = | |
3980 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
3981 _time_target_ms = time_target_ms - diff_prediction_ms; | |
3982 | |
3983 // set up the variables that are used in the work-based scheme to | |
3984 // call the regular clock method | |
3985 _words_scanned = 0; | |
3986 _refs_reached = 0; | |
3987 recalculate_limits(); | |
3988 | |
3989 // clear all flags | |
3990 clear_has_aborted(); | |
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3991 _has_timed_out = false; |
342 | 3992 _draining_satb_buffers = false; |
3993 | |
3994 ++_calls; | |
3995 | |
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3996 if (_cm->verbose_low()) { |
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3997 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 3998 "target = %1.2lfms >>>>>>>>>>", |
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3999 _worker_id, _calls, _time_target_ms); |
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4000 } |
342 | 4001 |
4002 // Set up the bitmap and oop closures. Anything that uses them is | |
4003 // eventually called from this method, so it is OK to allocate these | |
4004 // statically. | |
4005 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4006 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4007 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4008 |
4009 if (_cm->has_overflown()) { | |
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4010 // This can happen if the mark stack overflows during a GC pause |
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4011 // and this task, after a yield point, restarts. We have to abort |
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4012 // as we need to get into the overflow protocol which happens |
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4013 // right at the end of this task. |
342 | 4014 set_has_aborted(); |
4015 } | |
4016 | |
4017 // First drain any available SATB buffers. After this, we will not | |
4018 // look at SATB buffers before the next invocation of this method. | |
4019 // If enough completed SATB buffers are queued up, the regular clock | |
4020 // will abort this task so that it restarts. | |
4021 drain_satb_buffers(); | |
4022 // ...then partially drain the local queue and the global stack | |
4023 drain_local_queue(true); | |
4024 drain_global_stack(true); | |
4025 | |
4026 do { | |
4027 if (!has_aborted() && _curr_region != NULL) { | |
4028 // This means that we're already holding on to a region. | |
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4029 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4030 "should not be NULL either"); |
342 | 4031 |
4032 // We might have restarted this task after an evacuation pause | |
4033 // which might have evacuated the region we're holding on to | |
4034 // underneath our feet. Let's read its limit again to make sure | |
4035 // that we do not iterate over a region of the heap that | |
4036 // contains garbage (update_region_limit() will also move | |
4037 // _finger to the start of the region if it is found empty). | |
4038 update_region_limit(); | |
4039 // We will start from _finger not from the start of the region, | |
4040 // as we might be restarting this task after aborting half-way | |
4041 // through scanning this region. In this case, _finger points to | |
4042 // the address where we last found a marked object. If this is a | |
4043 // fresh region, _finger points to start(). | |
4044 MemRegion mr = MemRegion(_finger, _region_limit); | |
4045 | |
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4046 if (_cm->verbose_low()) { |
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4047 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4048 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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4049 "of region "HR_FORMAT, |
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4050 _worker_id, _finger, _region_limit, |
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4051 HR_FORMAT_PARAMS(_curr_region)); |
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4052 } |
342 | 4053 |
8039
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4054 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
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4055 "humongous regions should go around loop once only"); |
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4056 |
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4057 // Some special cases: |
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4058 // If the memory region is empty, we can just give up the region. |
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4059 // If the current region is humongous then we only need to check |
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4060 // the bitmap for the bit associated with the start of the object, |
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4061 // scan the object if it's live, and give up the region. |
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4062 // Otherwise, let's iterate over the bitmap of the part of the region |
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4063 // that is left. |
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4064 // If the iteration is successful, give up the region. |
8039
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4065 if (mr.is_empty()) { |
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4066 giveup_current_region(); |
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4067 regular_clock_call(); |
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4068 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
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|
4069 if (_nextMarkBitMap->isMarked(mr.start())) { |
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|
4070 // The object is marked - apply the closure |
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4071 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
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|
4072 bitmap_closure.do_bit(offset); |
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4073 } |
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4074 // Even if this task aborted while scanning the humongous object |
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4075 // we can (and should) give up the current region. |
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|
4076 giveup_current_region(); |
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|
4077 regular_clock_call(); |
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|
4078 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4079 giveup_current_region(); |
4080 regular_clock_call(); | |
4081 } else { | |
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4082 assert(has_aborted(), "currently the only way to do so"); |
342 | 4083 // The only way to abort the bitmap iteration is to return |
4084 // false from the do_bit() method. However, inside the | |
4085 // do_bit() method we move the _finger to point to the | |
4086 // object currently being looked at. So, if we bail out, we | |
4087 // have definitely set _finger to something non-null. | |
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4088 assert(_finger != NULL, "invariant"); |
342 | 4089 |
4090 // Region iteration was actually aborted. So now _finger | |
4091 // points to the address of the object we last scanned. If we | |
4092 // leave it there, when we restart this task, we will rescan | |
4093 // the object. It is easy to avoid this. We move the finger by | |
4094 // enough to point to the next possible object header (the | |
4095 // bitmap knows by how much we need to move it as it knows its | |
4096 // granularity). | |
1314
3f0549ed0c98
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|
4097 assert(_finger < _region_limit, "invariant"); |
8733
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8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
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4098 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
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4099 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
4100 if (new_finger >= _region_limit) { |
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4101 giveup_current_region(); |
1314
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|
4102 } else { |
5988
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4103 move_finger_to(new_finger); |
1314
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|
4104 } |
342 | 4105 } |
4106 } | |
4107 // At this point we have either completed iterating over the | |
4108 // region we were holding on to, or we have aborted. | |
4109 | |
4110 // We then partially drain the local queue and the global stack. | |
4111 // (Do we really need this?) | |
4112 drain_local_queue(true); | |
4113 drain_global_stack(true); | |
4114 | |
4115 // Read the note on the claim_region() method on why it might | |
4116 // return NULL with potentially more regions available for | |
4117 // claiming and why we have to check out_of_regions() to determine | |
4118 // whether we're done or not. | |
4119 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4120 // We are going to try to claim a new region. We should have | |
4121 // given up on the previous one. | |
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4122 // Separated the asserts so that we know which one fires. |
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4123 assert(_curr_region == NULL, "invariant"); |
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|
4124 assert(_finger == NULL, "invariant"); |
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|
4125 assert(_region_limit == NULL, "invariant"); |
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|
4126 if (_cm->verbose_low()) { |
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4127 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
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4128 } |
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|
4129 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4130 if (claimed_region != NULL) { |
4131 // Yes, we managed to claim one | |
4132 statsOnly( ++_regions_claimed ); | |
4133 | |
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|
4134 if (_cm->verbose_low()) { |
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|
4135 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4136 "region "PTR_FORMAT, |
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4137 _worker_id, claimed_region); |
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|
4138 } |
342 | 4139 |
4140 setup_for_region(claimed_region); | |
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|
4141 assert(_curr_region == claimed_region, "invariant"); |
342 | 4142 } |
4143 // It is important to call the regular clock here. It might take | |
4144 // a while to claim a region if, for example, we hit a large | |
4145 // block of empty regions. So we need to call the regular clock | |
4146 // method once round the loop to make sure it's called | |
4147 // frequently enough. | |
4148 regular_clock_call(); | |
4149 } | |
4150 | |
4151 if (!has_aborted() && _curr_region == NULL) { | |
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|
4152 assert(_cm->out_of_regions(), |
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|
4153 "at this point we should be out of regions"); |
342 | 4154 } |
4155 } while ( _curr_region != NULL && !has_aborted()); | |
4156 | |
4157 if (!has_aborted()) { | |
4158 // We cannot check whether the global stack is empty, since other | |
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4159 // tasks might be pushing objects to it concurrently. |
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|
4160 assert(_cm->out_of_regions(), |
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|
4161 "at this point we should be out of regions"); |
342 | 4162 |
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|
4163 if (_cm->verbose_low()) { |
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4164 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
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4165 } |
342 | 4166 |
4167 // Try to reduce the number of available SATB buffers so that | |
4168 // remark has less work to do. | |
4169 drain_satb_buffers(); | |
4170 } | |
4171 | |
4172 // Since we've done everything else, we can now totally drain the | |
4173 // local queue and global stack. | |
4174 drain_local_queue(false); | |
4175 drain_global_stack(false); | |
4176 | |
4177 // Attempt at work stealing from other task's queues. | |
2174
234761c55641
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|
4178 if (do_stealing && !has_aborted()) { |
342 | 4179 // We have not aborted. This means that we have finished all that |
4180 // we could. Let's try to do some stealing... | |
4181 | |
4182 // We cannot check whether the global stack is empty, since other | |
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4183 // tasks might be pushing objects to it concurrently. |
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|
4184 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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4185 "only way to reach here"); |
342 | 4186 |
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4187 if (_cm->verbose_low()) { |
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4188 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
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|
4189 } |
342 | 4190 |
4191 while (!has_aborted()) { | |
4192 oop obj; | |
4193 statsOnly( ++_steal_attempts ); | |
4194 | |
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|
4195 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4196 if (_cm->verbose_medium()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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changeset
|
4197 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
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|
4198 _worker_id, (void*) obj); |
3776
23d434c6290d
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|
4199 } |
342 | 4200 |
4201 statsOnly( ++_steals ); | |
4202 | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4203 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
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|
4204 "any stolen object should be marked"); |
342 | 4205 scan_object(obj); |
4206 | |
4207 // And since we're towards the end, let's totally drain the | |
4208 // local queue and global stack. | |
4209 drain_local_queue(false); | |
4210 drain_global_stack(false); | |
4211 } else { | |
4212 break; | |
4213 } | |
4214 } | |
4215 } | |
4216 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4217 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4218 // 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
|
4219 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
|
4220 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
|
4221 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
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diff
changeset
|
4222 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4223 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
4224 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4225 |
342 | 4226 // We still haven't aborted. Now, let's try to get into the |
4227 // termination protocol. | |
2174
234761c55641
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|
4228 if (do_termination && !has_aborted()) { |
342 | 4229 // We cannot check whether the global stack is empty, since other |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
4230 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4231 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
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|
4232 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4233 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4234 |
3776
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|
4235 if (_cm->verbose_low()) { |
6862
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|
4236 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
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|
4237 } |
342 | 4238 |
4239 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4240 // The CMTask class also extends the TerminatorTerminator class, | |
4241 // hence its should_exit_termination() method will also decide | |
4242 // whether to exit the termination protocol or not. | |
4243 bool finished = _cm->terminator()->offer_termination(this); | |
4244 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4245 _termination_time_ms += | |
4246 termination_end_time_ms - _termination_start_time_ms; | |
4247 | |
4248 if (finished) { | |
4249 // We're all done. | |
4250 | |
6862
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|
4251 if (_worker_id == 0) { |
342 | 4252 // let's allow task 0 to do this |
4253 if (concurrent()) { | |
1023
11d4857fe5e1
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|
4254 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4255 // we need to set this to false before the next |
4256 // safepoint. This way we ensure that the marking phase | |
4257 // doesn't observe any more heap expansions. | |
4258 _cm->clear_concurrent_marking_in_progress(); | |
4259 } | |
4260 } | |
4261 | |
4262 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4263 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
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parents:
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diff
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|
4264 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
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|
4265 // which one. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
4266 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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changeset
|
4267 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4268 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4269 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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1022
diff
changeset
|
4270 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4271 |
3776
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|
4272 if (_cm->verbose_low()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4273 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
23d434c6290d
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|
4274 } |
342 | 4275 } else { |
4276 // Apparently there's more work to do. Let's abort this task. It | |
4277 // will restart it and we can hopefully find more things to do. | |
4278 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4279 if (_cm->verbose_low()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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parents:
6812
diff
changeset
|
4280 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4281 _worker_id); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4282 } |
342 | 4283 |
4284 set_has_aborted(); | |
4285 statsOnly( ++_aborted_termination ); | |
4286 } | |
4287 } | |
4288 | |
4289 // Mainly for debugging purposes to make sure that a pointer to the | |
4290 // closure which was statically allocated in this frame doesn't | |
4291 // escape it by accident. | |
3771 | 4292 set_cm_oop_closure(NULL); |
342 | 4293 double end_time_ms = os::elapsedVTime() * 1000.0; |
4294 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4295 // Update the step history. | |
4296 _step_times_ms.add(elapsed_time_ms); | |
4297 | |
4298 if (has_aborted()) { | |
4299 // The task was aborted for some reason. | |
4300 | |
4301 statsOnly( ++_aborted ); | |
4302 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4303 if (_has_timed_out) { |
342 | 4304 double diff_ms = elapsed_time_ms - _time_target_ms; |
4305 // Keep statistics of how well we did with respect to hitting | |
4306 // our target only if we actually timed out (if we aborted for | |
4307 // other reasons, then the results might get skewed). | |
4308 _marking_step_diffs_ms.add(diff_ms); | |
4309 } | |
4310 | |
4311 if (_cm->has_overflown()) { | |
4312 // This is the interesting one. We aborted because a global | |
4313 // overflow was raised. This means we have to restart the | |
4314 // marking phase and start iterating over regions. However, in | |
4315 // order to do this we have to make sure that all tasks stop | |
4316 // what they are doing and re-initialise in a safe manner. We | |
4317 // will achieve this with the use of two barrier sync points. | |
4318 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4319 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4320 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
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|
4321 } |
342 | 4322 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4323 _cm->enter_first_sync_barrier(_worker_id); |
342 | 4324 // When we exit this sync barrier we know that all tasks have |
4325 // stopped doing marking work. So, it's now safe to | |
4326 // re-initialise our data structures. At the end of this method, | |
4327 // task 0 will clear the global data structures. | |
4328 | |
4329 statsOnly( ++_aborted_overflow ); | |
4330 | |
4331 // We clear the local state of this task... | |
4332 clear_region_fields(); | |
4333 | |
4334 // ...and enter the second barrier. | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4335 _cm->enter_second_sync_barrier(_worker_id); |
342 | 4336 // At this point everything has bee re-initialised and we're |
4337 // ready to restart. | |
4338 } | |
4339 | |
4340 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4341 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4342 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4343 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4344 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4345 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4346 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4347 } |
342 | 4348 } |
4349 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4350 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4351 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4352 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4353 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
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|
4354 } |
342 | 4355 } |
4356 | |
4357 _claimed = false; | |
4358 } | |
4359 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4360 CMTask::CMTask(uint worker_id, |
342 | 4361 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4362 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4363 BitMap* card_bm, |
342 | 4364 CMTaskQueue* task_queue, |
4365 CMTaskQueueSet* task_queues) | |
4366 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4367 _worker_id(worker_id), _cm(cm), |
342 | 4368 _claimed(false), |
4369 _nextMarkBitMap(NULL), _hash_seed(17), | |
4370 _task_queue(task_queue), | |
4371 _task_queues(task_queues), | |
3771 | 4372 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
4373 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
4374 _card_bm(card_bm) { |
1023
11d4857fe5e1
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tonyp
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1022
diff
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|
4375 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
4376 guarantee(task_queues != NULL, "invariant"); |
342 | 4377 |
4378 statsOnly( _clock_due_to_scanning = 0; | |
4379 _clock_due_to_marking = 0 ); | |
4380 | |
4381 _marking_step_diffs_ms.add(0.5); | |
4382 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4383 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4384 // These are formatting macros that are used below to ensure |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4385 // consistent formatting. The *_H_* versions are used to format the |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4386 // header for a particular value and they should be kept consistent |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4387 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4388 // the necessary white space (as a prefix) which makes them a bit |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4389 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4390 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4391 // All the output lines are prefixed with this string to be able to |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4392 // identify them easily in a large log file. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4393 #define G1PPRL_LINE_PREFIX "###" |
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
|
4394 |
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
|
4395 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
4396 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4397 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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|
4398 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4399 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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|
4400 #endif // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4401 |
371bbc844bf1
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diff
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|
4402 // For per-region info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4403 #define G1PPRL_TYPE_FORMAT " %-4s" |
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
|
4404 #define G1PPRL_TYPE_H_FORMAT " %4s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
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|
4405 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
4406 #define G1PPRL_BYTE_H_FORMAT " %9s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
4407 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4408 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
371bbc844bf1
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4409 |
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|
4410 // For summary info |
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|
4411 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4412 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4413 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4414 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4415 |
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|
4416 G1PrintRegionLivenessInfoClosure:: |
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|
4417 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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|
4418 : _out(out), |
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|
4419 _total_used_bytes(0), _total_capacity_bytes(0), |
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|
4420 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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|
4421 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4422 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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4423 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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4424 MemRegion g1_committed = g1h->g1_committed(); |
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4425 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4426 double now = os::elapsedTime(); |
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|
4427 |
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|
4428 // Print the header of the output. |
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|
4429 _out->cr(); |
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|
4430 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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4431 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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4432 G1PPRL_SUM_ADDR_FORMAT("committed") |
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4433 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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4434 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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|
4435 g1_committed.start(), g1_committed.end(), |
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|
4436 g1_reserved.start(), g1_reserved.end(), |
3986
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|
4437 HeapRegion::GrainBytes); |
2435
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|
4438 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4439 _out->print_cr(G1PPRL_LINE_PREFIX |
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4440 G1PPRL_TYPE_H_FORMAT |
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|
4441 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4442 G1PPRL_BYTE_H_FORMAT |
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|
4443 G1PPRL_BYTE_H_FORMAT |
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|
4444 G1PPRL_BYTE_H_FORMAT |
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4445 G1PPRL_DOUBLE_H_FORMAT, |
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|
4446 "type", "address-range", |
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|
4447 "used", "prev-live", "next-live", "gc-eff"); |
3977
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|
4448 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4449 G1PPRL_TYPE_H_FORMAT |
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|
4450 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4451 G1PPRL_BYTE_H_FORMAT |
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|
4452 G1PPRL_BYTE_H_FORMAT |
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|
4453 G1PPRL_BYTE_H_FORMAT |
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|
4454 G1PPRL_DOUBLE_H_FORMAT, |
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|
4455 "", "", |
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|
4456 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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|
4457 } |
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|
4458 |
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|
4459 // It takes as a parameter a reference to one of the _hum_* fields, it |
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4460 // deduces the corresponding value for a region in a humongous region |
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4461 // series (either the region size, or what's left if the _hum_* field |
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|
4462 // is < the region size), and updates the _hum_* field accordingly. |
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|
4463 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4464 size_t bytes = 0; |
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|
4465 // The > 0 check is to deal with the prev and next live bytes which |
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|
4466 // could be 0. |
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|
4467 if (*hum_bytes > 0) { |
3986
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7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
4468 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
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|
4469 *hum_bytes -= bytes; |
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|
4470 } |
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|
4471 return bytes; |
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|
4472 } |
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|
4473 |
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|
4474 // It deduces the values for a region in a humongous region series |
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|
4475 // from the _hum_* fields and updates those accordingly. It assumes |
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|
4476 // that that _hum_* fields have already been set up from the "starts |
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|
4477 // humongous" region and we visit the regions in address order. |
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|
4478 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4479 size_t* capacity_bytes, |
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|
4480 size_t* prev_live_bytes, |
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|
4481 size_t* next_live_bytes) { |
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|
4482 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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|
4483 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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|
4484 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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|
4485 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4486 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4487 } |
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|
4488 |
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|
4489 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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|
4490 const char* type = ""; |
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|
4491 HeapWord* bottom = r->bottom(); |
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|
4492 HeapWord* end = r->end(); |
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|
4493 size_t capacity_bytes = r->capacity(); |
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|
4494 size_t used_bytes = r->used(); |
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|
4495 size_t prev_live_bytes = r->live_bytes(); |
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|
4496 size_t next_live_bytes = r->next_live_bytes(); |
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|
4497 double gc_eff = r->gc_efficiency(); |
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|
4498 if (r->used() == 0) { |
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|
4499 type = "FREE"; |
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|
4500 } else if (r->is_survivor()) { |
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|
4501 type = "SURV"; |
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|
4502 } else if (r->is_young()) { |
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|
4503 type = "EDEN"; |
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|
4504 } else if (r->startsHumongous()) { |
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|
4505 type = "HUMS"; |
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|
4506 |
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|
4507 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4508 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
4509 "they should have been zeroed after the last time we used them"); |
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|
4510 // Set up the _hum_* fields. |
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|
4511 _hum_capacity_bytes = capacity_bytes; |
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|
4512 _hum_used_bytes = used_bytes; |
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|
4513 _hum_prev_live_bytes = prev_live_bytes; |
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|
4514 _hum_next_live_bytes = next_live_bytes; |
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|
4515 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
4516 &prev_live_bytes, &next_live_bytes); |
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|
4517 end = bottom + HeapRegion::GrainWords; |
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|
4518 } else if (r->continuesHumongous()) { |
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|
4519 type = "HUMC"; |
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4520 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4521 &prev_live_bytes, &next_live_bytes); |
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4522 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4523 } else { |
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4524 type = "OLD"; |
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4525 } |
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4526 |
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4527 _total_used_bytes += used_bytes; |
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4528 _total_capacity_bytes += capacity_bytes; |
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4529 _total_prev_live_bytes += prev_live_bytes; |
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4530 _total_next_live_bytes += next_live_bytes; |
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4531 |
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4532 // Print a line for this particular region. |
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4533 _out->print_cr(G1PPRL_LINE_PREFIX |
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4534 G1PPRL_TYPE_FORMAT |
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4535 G1PPRL_ADDR_BASE_FORMAT |
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4536 G1PPRL_BYTE_FORMAT |
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4537 G1PPRL_BYTE_FORMAT |
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4538 G1PPRL_BYTE_FORMAT |
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4539 G1PPRL_DOUBLE_FORMAT, |
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4540 type, bottom, end, |
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4541 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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4542 |
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4543 return false; |
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4544 } |
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4545 |
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4546 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4547 // Print the footer of the output. |
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4548 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4549 _out->print_cr(G1PPRL_LINE_PREFIX |
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4550 " SUMMARY" |
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4551 G1PPRL_SUM_MB_FORMAT("capacity") |
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4552 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4553 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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4554 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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4555 bytes_to_mb(_total_capacity_bytes), |
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4556 bytes_to_mb(_total_used_bytes), |
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4557 perc(_total_used_bytes, _total_capacity_bytes), |
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4558 bytes_to_mb(_total_prev_live_bytes), |
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4559 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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4560 bytes_to_mb(_total_next_live_bytes), |
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4561 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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|
4562 _out->cr(); |
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4563 } |