Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 10186:b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
Reviewed-by: johnc, brutisso
author | stefank |
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date | Wed, 24 Apr 2013 20:13:37 +0200 |
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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 void CMBitMapRO::print_on_error(outputStream* st, const char* prefix) const { |
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105 _bm.print_on_error(st, prefix); |
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106 } |
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107 |
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108 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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109 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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110 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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111 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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112 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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113 if (!brs.is_reserved()) { |
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114 warning("ConcurrentMark marking bit map allocation failure"); |
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115 return false; |
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116 } |
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117 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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118 // For now we'll just commit all of the bit map up front. |
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119 // Later on we'll try to be more parsimonious with swap. |
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120 if (!_virtual_space.initialize(brs, brs.size())) { |
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121 warning("ConcurrentMark marking bit map backing store failure"); |
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122 return false; |
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123 } |
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124 assert(_virtual_space.committed_size() == brs.size(), |
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125 "didn't reserve backing store for all of concurrent marking bit map?"); |
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126 _bm.set_map((uintptr_t*)_virtual_space.low()); |
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127 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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128 _bmWordSize, "inconsistency in bit map sizing"); |
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129 _bm.set_size(_bmWordSize >> _shifter); |
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130 return true; |
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131 } |
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132 |
342 | 133 void CMBitMap::clearAll() { |
134 _bm.clear(); | |
135 return; | |
136 } | |
137 | |
138 void CMBitMap::markRange(MemRegion mr) { | |
139 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
140 assert(!mr.is_empty(), "unexpected empty region"); | |
141 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
142 ((HeapWord *) mr.end())), | |
143 "markRange memory region end is not card aligned"); | |
144 // convert address range into offset range | |
145 _bm.at_put_range(heapWordToOffset(mr.start()), | |
146 heapWordToOffset(mr.end()), true); | |
147 } | |
148 | |
149 void CMBitMap::clearRange(MemRegion mr) { | |
150 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
151 assert(!mr.is_empty(), "unexpected empty region"); | |
152 // convert address range into offset range | |
153 _bm.at_put_range(heapWordToOffset(mr.start()), | |
154 heapWordToOffset(mr.end()), false); | |
155 } | |
156 | |
157 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
158 HeapWord* end_addr) { | |
159 HeapWord* start = getNextMarkedWordAddress(addr); | |
160 start = MIN2(start, end_addr); | |
161 HeapWord* end = getNextUnmarkedWordAddress(start); | |
162 end = MIN2(end, end_addr); | |
163 assert(start <= end, "Consistency check"); | |
164 MemRegion mr(start, end); | |
165 if (!mr.is_empty()) { | |
166 clearRange(mr); | |
167 } | |
168 return mr; | |
169 } | |
170 | |
171 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
172 _base(NULL), _cm(cm) | |
173 #ifdef ASSERT | |
174 , _drain_in_progress(false) | |
175 , _drain_in_progress_yields(false) | |
176 #endif | |
177 {} | |
178 | |
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179 bool CMMarkStack::allocate(size_t capacity) { |
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180 // allocate a stack of the requisite depth |
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181 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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182 if (!rs.is_reserved()) { |
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183 warning("ConcurrentMark MarkStack allocation failure"); |
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184 return false; |
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185 } |
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186 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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187 if (!_virtual_space.initialize(rs, rs.size())) { |
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188 warning("ConcurrentMark MarkStack backing store failure"); |
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189 // Release the virtual memory reserved for the marking stack |
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190 rs.release(); |
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191 return false; |
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192 } |
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193 assert(_virtual_space.committed_size() == rs.size(), |
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194 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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195 _base = (oop*) _virtual_space.low(); |
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196 setEmpty(); |
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197 _capacity = (jint) capacity; |
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198 _saved_index = -1; |
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199 _should_expand = false; |
342 | 200 NOT_PRODUCT(_max_depth = 0); |
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201 return true; |
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202 } |
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203 |
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204 void CMMarkStack::expand() { |
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205 // Called, during remark, if we've overflown the marking stack during marking. |
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206 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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207 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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208 // Clear expansion flag |
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209 _should_expand = false; |
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210 if (_capacity == (jint) MarkStackSizeMax) { |
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211 if (PrintGCDetails && Verbose) { |
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212 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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213 } |
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214 return; |
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215 } |
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216 // Double capacity if possible |
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217 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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218 // Do not give up existing stack until we have managed to |
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219 // get the double capacity that we desired. |
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220 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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221 sizeof(oop))); |
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222 if (rs.is_reserved()) { |
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223 // Release the backing store associated with old stack |
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224 _virtual_space.release(); |
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225 // Reinitialize virtual space for new stack |
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226 if (!_virtual_space.initialize(rs, rs.size())) { |
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227 fatal("Not enough swap for expanded marking stack capacity"); |
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228 } |
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229 _base = (oop*)(_virtual_space.low()); |
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230 _index = 0; |
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231 _capacity = new_capacity; |
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232 } else { |
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233 if (PrintGCDetails && Verbose) { |
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234 // Failed to double capacity, continue; |
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235 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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236 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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237 _capacity / K, new_capacity / K); |
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238 } |
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239 } |
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240 } |
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241 |
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242 void CMMarkStack::set_should_expand() { |
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243 // If we're resetting the marking state because of an |
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244 // marking stack overflow, record that we should, if |
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245 // possible, expand the stack. |
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246 _should_expand = _cm->has_overflown(); |
342 | 247 } |
248 | |
249 CMMarkStack::~CMMarkStack() { | |
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250 if (_base != NULL) { |
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251 _base = NULL; |
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252 _virtual_space.release(); |
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253 } |
342 | 254 } |
255 | |
256 void CMMarkStack::par_push(oop ptr) { | |
257 while (true) { | |
258 if (isFull()) { | |
259 _overflow = true; | |
260 return; | |
261 } | |
262 // Otherwise... | |
263 jint index = _index; | |
264 jint next_index = index+1; | |
265 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
266 if (res == index) { | |
267 _base[index] = ptr; | |
268 // Note that we don't maintain this atomically. We could, but it | |
269 // doesn't seem necessary. | |
270 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
271 return; | |
272 } | |
273 // Otherwise, we need to try again. | |
274 } | |
275 } | |
276 | |
277 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
278 while (true) { | |
279 if (isFull()) { | |
280 _overflow = true; | |
281 return; | |
282 } | |
283 // Otherwise... | |
284 jint index = _index; | |
285 jint next_index = index + n; | |
286 if (next_index > _capacity) { | |
287 _overflow = true; | |
288 return; | |
289 } | |
290 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
291 if (res == index) { | |
292 for (int i = 0; i < n; i++) { | |
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293 int ind = index + i; |
342 | 294 assert(ind < _capacity, "By overflow test above."); |
295 _base[ind] = ptr_arr[i]; | |
296 } | |
297 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
298 return; | |
299 } | |
300 // Otherwise, we need to try again. | |
301 } | |
302 } | |
303 | |
304 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
305 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
306 jint start = _index; | |
307 jint next_index = start + n; | |
308 if (next_index > _capacity) { | |
309 _overflow = true; | |
310 return; | |
311 } | |
312 // Otherwise. | |
313 _index = next_index; | |
314 for (int i = 0; i < n; i++) { | |
315 int ind = start + i; | |
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316 assert(ind < _capacity, "By overflow test above."); |
342 | 317 _base[ind] = ptr_arr[i]; |
318 } | |
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319 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 320 } |
321 | |
322 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
323 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
324 jint index = _index; | |
325 if (index == 0) { | |
326 *n = 0; | |
327 return false; | |
328 } else { | |
329 int k = MIN2(max, index); | |
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330 jint new_ind = index - k; |
342 | 331 for (int j = 0; j < k; j++) { |
332 ptr_arr[j] = _base[new_ind + j]; | |
333 } | |
334 _index = new_ind; | |
335 *n = k; | |
336 return true; | |
337 } | |
338 } | |
339 | |
340 template<class OopClosureClass> | |
341 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
342 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
343 || SafepointSynchronize::is_at_safepoint(), | |
344 "Drain recursion must be yield-safe."); | |
345 bool res = true; | |
346 debug_only(_drain_in_progress = true); | |
347 debug_only(_drain_in_progress_yields = yield_after); | |
348 while (!isEmpty()) { | |
349 oop newOop = pop(); | |
350 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
351 assert(newOop->is_oop(), "Expected an oop"); | |
352 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
353 "only grey objects on this stack"); | |
354 newOop->oop_iterate(cl); | |
355 if (yield_after && _cm->do_yield_check()) { | |
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356 res = false; |
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357 break; |
342 | 358 } |
359 } | |
360 debug_only(_drain_in_progress = false); | |
361 return res; | |
362 } | |
363 | |
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364 void CMMarkStack::note_start_of_gc() { |
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365 assert(_saved_index == -1, |
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366 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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367 _saved_index = _index; |
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368 } |
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369 |
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370 void CMMarkStack::note_end_of_gc() { |
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371 // This is intentionally a guarantee, instead of an assert. If we |
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372 // accidentally add something to the mark stack during GC, it |
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373 // will be a correctness issue so it's better if we crash. we'll |
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374 // only check this once per GC anyway, so it won't be a performance |
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375 // issue in any way. |
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376 guarantee(_saved_index == _index, |
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377 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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378 _saved_index = -1; |
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379 } |
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380 |
342 | 381 void CMMarkStack::oops_do(OopClosure* f) { |
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382 assert(_saved_index == _index, |
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383 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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384 for (int i = 0; i < _index; i += 1) { |
342 | 385 f->do_oop(&_base[i]); |
386 } | |
387 } | |
388 | |
389 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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390 return _g1h->is_obj_ill(obj); |
342 | 391 } |
392 | |
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393 CMRootRegions::CMRootRegions() : |
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394 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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395 _should_abort(false), _next_survivor(NULL) { } |
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396 |
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397 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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398 _young_list = g1h->young_list(); |
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399 _cm = cm; |
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400 } |
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401 |
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402 void CMRootRegions::prepare_for_scan() { |
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403 assert(!scan_in_progress(), "pre-condition"); |
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404 |
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405 // Currently, only survivors can be root regions. |
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406 assert(_next_survivor == NULL, "pre-condition"); |
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407 _next_survivor = _young_list->first_survivor_region(); |
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408 _scan_in_progress = (_next_survivor != NULL); |
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409 _should_abort = false; |
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410 } |
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411 |
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412 HeapRegion* CMRootRegions::claim_next() { |
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413 if (_should_abort) { |
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414 // If someone has set the should_abort flag, we return NULL to |
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415 // force the caller to bail out of their loop. |
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416 return NULL; |
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417 } |
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418 |
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419 // Currently, only survivors can be root regions. |
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420 HeapRegion* res = _next_survivor; |
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421 if (res != NULL) { |
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422 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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423 // Read it again in case it changed while we were waiting for the lock. |
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424 res = _next_survivor; |
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425 if (res != NULL) { |
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426 if (res == _young_list->last_survivor_region()) { |
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427 // We just claimed the last survivor so store NULL to indicate |
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428 // that we're done. |
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429 _next_survivor = NULL; |
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430 } else { |
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431 _next_survivor = res->get_next_young_region(); |
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432 } |
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433 } else { |
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434 // Someone else claimed the last survivor while we were trying |
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435 // to take the lock so nothing else to do. |
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436 } |
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437 } |
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438 assert(res == NULL || res->is_survivor(), "post-condition"); |
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439 |
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440 return res; |
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441 } |
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442 |
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443 void CMRootRegions::scan_finished() { |
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444 assert(scan_in_progress(), "pre-condition"); |
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445 |
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446 // Currently, only survivors can be root regions. |
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447 if (!_should_abort) { |
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448 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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449 } |
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450 _next_survivor = NULL; |
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451 |
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452 { |
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453 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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454 _scan_in_progress = false; |
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455 RootRegionScan_lock->notify_all(); |
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456 } |
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457 } |
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458 |
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459 bool CMRootRegions::wait_until_scan_finished() { |
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460 if (!scan_in_progress()) return false; |
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461 |
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462 { |
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463 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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464 while (scan_in_progress()) { |
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465 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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466 } |
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467 } |
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468 return true; |
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469 } |
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470 |
342 | 471 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
472 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
473 #endif // _MSC_VER | |
474 | |
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475 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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476 return MAX2((n_par_threads + 2) / 4, 1U); |
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477 } |
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478 |
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479 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
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480 _g1h(g1h), |
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481 _markBitMap1(MinObjAlignment - 1), |
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482 _markBitMap2(MinObjAlignment - 1), |
342 | 483 |
484 _parallel_marking_threads(0), | |
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485 _max_parallel_marking_threads(0), |
342 | 486 _sleep_factor(0.0), |
487 _marking_task_overhead(1.0), | |
488 _cleanup_sleep_factor(0.0), | |
489 _cleanup_task_overhead(1.0), | |
2152 | 490 _cleanup_list("Cleanup List"), |
7397
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491 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
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492 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
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493 CardTableModRefBS::card_shift, |
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494 false /* in_resource_area*/), |
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495 |
342 | 496 _prevMarkBitMap(&_markBitMap1), |
497 _nextMarkBitMap(&_markBitMap2), | |
498 | |
499 _markStack(this), | |
500 // _finger set in set_non_marking_state | |
501 | |
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502 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 503 // _active_tasks set in set_non_marking_state |
504 // _tasks set inside the constructor | |
6862
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505 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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506 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 507 |
508 _has_overflown(false), | |
509 _concurrent(false), | |
619
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510 _has_aborted(false), |
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511 _restart_for_overflow(false), |
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512 _concurrent_marking_in_progress(false), |
342 | 513 |
514 // _verbose_level set below | |
515 | |
516 _init_times(), | |
517 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
518 _cleanup_times(), | |
519 _total_counting_time(0.0), | |
520 _total_rs_scrub_time(0.0), | |
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521 |
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522 _parallel_workers(NULL), |
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523 |
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524 _count_card_bitmaps(NULL), |
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525 _count_marked_bytes(NULL), |
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526 _completed_initialization(false) { |
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527 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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528 if (verbose_level < no_verbose) { |
342 | 529 verbose_level = no_verbose; |
3776
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530 } |
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531 if (verbose_level > high_verbose) { |
342 | 532 verbose_level = high_verbose; |
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533 } |
342 | 534 _verbose_level = verbose_level; |
535 | |
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536 if (verbose_low()) { |
342 | 537 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
538 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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539 } |
342 | 540 |
7397
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541 if (!_markBitMap1.allocate(heap_rs)) { |
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542 warning("Failed to allocate first CM bit map"); |
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543 return; |
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544 } |
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545 if (!_markBitMap2.allocate(heap_rs)) { |
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546 warning("Failed to allocate second CM bit map"); |
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547 return; |
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548 } |
342 | 549 |
550 // Create & start a ConcurrentMark thread. | |
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551 _cmThread = new ConcurrentMarkThread(this); |
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552 assert(cmThread() != NULL, "CM Thread should have been created"); |
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553 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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554 |
342 | 555 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
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556 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
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557 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 558 |
559 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 560 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 561 |
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562 _root_regions.init(_g1h, this); |
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563 |
1284 | 564 if (ConcGCThreads > ParallelGCThreads) { |
7397
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565 warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") " |
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566 "than ParallelGCThreads (" UINT32_FORMAT ").", |
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567 ConcGCThreads, ParallelGCThreads); |
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568 return; |
342 | 569 } |
570 if (ParallelGCThreads == 0) { | |
571 // if we are not running with any parallel GC threads we will not | |
572 // spawn any marking threads either | |
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573 _parallel_marking_threads = 0; |
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574 _max_parallel_marking_threads = 0; |
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575 _sleep_factor = 0.0; |
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576 _marking_task_overhead = 1.0; |
342 | 577 } else { |
8006
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578 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
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579 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 580 // if both are set |
581 _sleep_factor = 0.0; | |
582 _marking_task_overhead = 1.0; | |
751 | 583 } else if (G1MarkingOverheadPercent > 0) { |
8006
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584 // We will calculate the number of parallel marking threads based |
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585 // on a target overhead with respect to the soft real-time goal |
751 | 586 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 587 double overall_cm_overhead = |
751 | 588 (double) MaxGCPauseMillis * marking_overhead / |
589 (double) GCPauseIntervalMillis; | |
342 | 590 double cpu_ratio = 1.0 / (double) os::processor_count(); |
591 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
592 double marking_task_overhead = | |
593 overall_cm_overhead / marking_thread_num * | |
594 (double) os::processor_count(); | |
595 double sleep_factor = | |
596 (1.0 - marking_task_overhead) / marking_task_overhead; | |
597 | |
8006
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598 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 599 _sleep_factor = sleep_factor; |
600 _marking_task_overhead = marking_task_overhead; | |
601 } else { | |
8006
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602 // Calculate the number of parallel marking threads by scaling |
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603 // the number of parallel GC threads. |
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604 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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605 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 606 _sleep_factor = 0.0; |
607 _marking_task_overhead = 1.0; | |
608 } | |
609 | |
8006
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610 assert(ConcGCThreads > 0, "Should have been set"); |
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611 _parallel_marking_threads = (uint) ConcGCThreads; |
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612 _max_parallel_marking_threads = _parallel_marking_threads; |
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613 |
3776
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614 if (parallel_marking_threads() > 1) { |
342 | 615 _cleanup_task_overhead = 1.0; |
3776
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616 } else { |
342 | 617 _cleanup_task_overhead = marking_task_overhead(); |
3776
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618 } |
342 | 619 _cleanup_sleep_factor = |
620 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
621 | |
622 #if 0 | |
623 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
624 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
625 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
626 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
627 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
628 #endif | |
629 | |
1023
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630 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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631 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
4728
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632 _max_parallel_marking_threads, false, true); |
1833
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633 if (_parallel_workers == NULL) { |
342 | 634 vm_exit_during_initialization("Failed necessary allocation."); |
1833
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635 } else { |
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636 _parallel_workers->initialize_workers(); |
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637 } |
342 | 638 } |
639 | |
7397
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640 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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641 uintx mark_stack_size = |
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642 MIN2(MarkStackSizeMax, |
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643 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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644 // Verify that the calculated value for MarkStackSize is in range. |
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645 // It would be nice to use the private utility routine from Arguments. |
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646 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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647 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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648 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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649 mark_stack_size, 1, MarkStackSizeMax); |
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650 return; |
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651 } |
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652 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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653 } else { |
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654 // Verify MarkStackSize is in range. |
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655 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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656 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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657 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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658 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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659 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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660 MarkStackSize, 1, MarkStackSizeMax); |
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661 return; |
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662 } |
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663 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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664 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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665 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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666 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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667 MarkStackSize, MarkStackSizeMax); |
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668 return; |
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|
669 } |
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670 } |
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671 } |
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672 } |
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673 |
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674 if (!_markStack.allocate(MarkStackSize)) { |
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675 warning("Failed to allocate CM marking stack"); |
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676 return; |
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677 } |
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678 |
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679 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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680 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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681 |
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682 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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683 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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684 |
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685 BitMap::idx_t card_bm_size = _card_bm.size(); |
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686 |
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687 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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688 _active_tasks = _max_worker_id; |
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689 |
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690 size_t max_regions = (size_t) _g1h->max_regions(); |
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691 for (uint i = 0; i < _max_worker_id; ++i) { |
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692 CMTaskQueue* task_queue = new CMTaskQueue(); |
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693 task_queue->initialize(); |
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694 _task_queues->register_queue(i, task_queue); |
442f942757c0
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695 |
442f942757c0
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696 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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697 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
698 |
442f942757c0
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699 _tasks[i] = new CMTask(i, this, |
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700 _count_marked_bytes[i], |
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701 &_count_card_bitmaps[i], |
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702 task_queue, _task_queues); |
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|
703 |
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704 _accum_task_vtime[i] = 0.0; |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
705 } |
442f942757c0
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|
706 |
442f942757c0
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707 // Calculate the card number for the bottom of the heap. Used |
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708 // in biasing indexes into the accounting card bitmaps. |
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|
709 _heap_bottom_card_num = |
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710 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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711 CardTableModRefBS::card_shift); |
442f942757c0
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|
712 |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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713 // Clear all the liveness counting data |
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|
714 clear_all_count_data(); |
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|
715 |
342 | 716 // so that the call below can read a sensible value |
7397
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717 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 718 set_non_marking_state(); |
7397
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719 _completed_initialization = true; |
342 | 720 } |
721 | |
722 void ConcurrentMark::update_g1_committed(bool force) { | |
723 // If concurrent marking is not in progress, then we do not need to | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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4837
diff
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|
724 // update _heap_end. |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
725 if (!concurrent_marking_in_progress() && !force) return; |
342 | 726 |
727 MemRegion committed = _g1h->g1_committed(); | |
1023
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728 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 729 HeapWord* new_end = committed.end(); |
730 if (new_end > _heap_end) { | |
731 // The heap has been expanded. | |
732 | |
733 _heap_end = new_end; | |
734 } | |
735 // Notice that the heap can also shrink. However, this only happens | |
736 // during a Full GC (at least currently) and the entire marking | |
737 // phase will bail out and the task will not be restarted. So, let's | |
738 // do nothing. | |
739 } | |
740 | |
741 void ConcurrentMark::reset() { | |
742 // Starting values for these two. This should be called in a STW | |
743 // phase. CM will be notified of any future g1_committed expansions | |
744 // will be at the end of evacuation pauses, when tasks are | |
745 // inactive. | |
746 MemRegion committed = _g1h->g1_committed(); | |
747 _heap_start = committed.start(); | |
748 _heap_end = committed.end(); | |
749 | |
1023
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750 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
751 assert(_heap_start != NULL, "heap bounds should look ok"); |
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752 assert(_heap_end != NULL, "heap bounds should look ok"); |
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753 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 754 |
7450
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|
755 // Reset all the marking data structures and any necessary flags |
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756 reset_marking_state(); |
342 | 757 |
3776
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758 if (verbose_low()) { |
342 | 759 gclog_or_tty->print_cr("[global] resetting"); |
3776
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760 } |
342 | 761 |
762 // We do reset all of them, since different phases will use | |
763 // different number of active threads. So, it's easiest to have all | |
764 // of them ready. | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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765 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 766 _tasks[i]->reset(_nextMarkBitMap); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
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|
767 } |
342 | 768 |
769 // we need this to make sure that the flag is on during the evac | |
770 // pause with initial mark piggy-backed | |
771 set_concurrent_marking_in_progress(); | |
772 } | |
773 | |
7450
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774 |
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|
775 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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|
776 _markStack.set_should_expand(); |
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777 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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778 if (clear_overflow) { |
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779 clear_has_overflown(); |
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780 } else { |
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781 assert(has_overflown(), "pre-condition"); |
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782 } |
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783 _finger = _heap_start; |
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784 |
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785 for (uint i = 0; i < _max_worker_id; ++i) { |
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786 CMTaskQueue* queue = _task_queues->queue(i); |
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787 queue->set_empty(); |
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788 } |
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789 } |
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790 |
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791 void ConcurrentMark::set_concurrency(uint active_tasks) { |
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792 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 793 |
794 _active_tasks = active_tasks; | |
795 // Need to update the three data structures below according to the | |
796 // number of active threads for this phase. | |
797 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
798 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
799 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
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800 } |
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801 |
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802 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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803 set_concurrency(active_tasks); |
342 | 804 |
805 _concurrent = concurrent; | |
806 // We propagate this to all tasks, not just the active ones. | |
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807 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 808 _tasks[i]->set_concurrent(concurrent); |
809 | |
810 if (concurrent) { | |
811 set_concurrent_marking_in_progress(); | |
812 } else { | |
813 // We currently assume that the concurrent flag has been set to | |
814 // false before we start remark. At this point we should also be | |
815 // in a STW phase. | |
1023
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816 assert(!concurrent_marking_in_progress(), "invariant"); |
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817 assert(_finger == _heap_end, |
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818 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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819 _finger, _heap_end)); |
342 | 820 update_g1_committed(true); |
821 } | |
822 } | |
823 | |
824 void ConcurrentMark::set_non_marking_state() { | |
825 // We set the global marking state to some default values when we're | |
826 // not doing marking. | |
7450
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827 reset_marking_state(); |
342 | 828 _active_tasks = 0; |
829 clear_concurrent_marking_in_progress(); | |
830 } | |
831 | |
832 ConcurrentMark::~ConcurrentMark() { | |
4735 | 833 // The ConcurrentMark instance is never freed. |
834 ShouldNotReachHere(); | |
342 | 835 } |
836 | |
837 void ConcurrentMark::clearNextBitmap() { | |
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838 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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839 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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840 |
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841 // Make sure that the concurrent mark thread looks to still be in |
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842 // the current cycle. |
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843 guarantee(cmThread()->during_cycle(), "invariant"); |
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844 |
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845 // We are finishing up the current cycle by clearing the next |
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846 // marking bitmap and getting it ready for the next cycle. During |
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847 // this time no other cycle can start. So, let's make sure that this |
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848 // is the case. |
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849 guarantee(!g1h->mark_in_progress(), "invariant"); |
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850 |
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851 // clear the mark bitmap (no grey objects to start with). |
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852 // We need to do this in chunks and offer to yield in between |
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853 // each chunk. |
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854 HeapWord* start = _nextMarkBitMap->startWord(); |
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855 HeapWord* end = _nextMarkBitMap->endWord(); |
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856 HeapWord* cur = start; |
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857 size_t chunkSize = M; |
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858 while (cur < end) { |
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859 HeapWord* next = cur + chunkSize; |
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860 if (next > end) { |
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861 next = end; |
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862 } |
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863 MemRegion mr(cur,next); |
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864 _nextMarkBitMap->clearRange(mr); |
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865 cur = next; |
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866 do_yield_check(); |
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867 |
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868 // Repeat the asserts from above. We'll do them as asserts here to |
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869 // minimize their overhead on the product. However, we'll have |
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870 // them as guarantees at the beginning / end of the bitmap |
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871 // clearing to get some checking in the product. |
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872 assert(cmThread()->during_cycle(), "invariant"); |
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873 assert(!g1h->mark_in_progress(), "invariant"); |
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874 } |
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875 |
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876 // Clear the liveness counting data |
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877 clear_all_count_data(); |
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878 |
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879 // Repeat the asserts from above. |
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880 guarantee(cmThread()->during_cycle(), "invariant"); |
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881 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 882 } |
883 | |
884 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
885 public: | |
886 bool doHeapRegion(HeapRegion* r) { | |
887 if (!r->continuesHumongous()) { | |
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888 r->note_start_of_marking(); |
342 | 889 } |
890 return false; | |
891 } | |
892 }; | |
893 | |
894 void ConcurrentMark::checkpointRootsInitialPre() { | |
895 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
896 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
897 | |
898 _has_aborted = false; | |
899 | |
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900 #ifndef PRODUCT |
1044 | 901 if (G1PrintReachableAtInitialMark) { |
1388 | 902 print_reachable("at-cycle-start", |
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903 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 904 } |
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905 #endif |
342 | 906 |
907 // Initialise marking structures. This has to be done in a STW phase. | |
908 reset(); | |
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909 |
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910 // For each region note start of marking. |
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911 NoteStartOfMarkHRClosure startcl; |
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912 g1h->heap_region_iterate(&startcl); |
342 | 913 } |
914 | |
915 | |
916 void ConcurrentMark::checkpointRootsInitialPost() { | |
917 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
918 | |
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919 // If we force an overflow during remark, the remark operation will |
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920 // actually abort and we'll restart concurrent marking. If we always |
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921 // force an oveflow during remark we'll never actually complete the |
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922 // marking phase. So, we initilize this here, at the start of the |
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923 // cycle, so that at the remaining overflow number will decrease at |
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924 // every remark and we'll eventually not need to cause one. |
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925 force_overflow_stw()->init(); |
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926 |
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927 // Start Concurrent Marking weak-reference discovery. |
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928 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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929 // enable ("weak") refs discovery |
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930 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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931 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 932 |
933 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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934 // This is the start of the marking cycle, we're expected all |
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935 // threads to have SATB queues with active set to false. |
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936 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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937 false /* expected_active */); |
342 | 938 |
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939 _root_regions.prepare_for_scan(); |
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940 |
342 | 941 // update_g1_committed() will be called at the end of an evac pause |
942 // when marking is on. So, it's also called at the end of the | |
943 // initial-mark pause to update the heap end, if the heap expands | |
944 // during it. No need to call it here. | |
945 } | |
946 | |
947 /* | |
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948 * Notice that in the next two methods, we actually leave the STS |
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949 * during the barrier sync and join it immediately afterwards. If we |
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950 * do not do this, the following deadlock can occur: one thread could |
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951 * be in the barrier sync code, waiting for the other thread to also |
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952 * sync up, whereas another one could be trying to yield, while also |
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953 * waiting for the other threads to sync up too. |
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954 * |
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955 * Note, however, that this code is also used during remark and in |
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956 * this case we should not attempt to leave / enter the STS, otherwise |
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957 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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958 * (product). So we should only leave / enter the STS if we are |
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959 * operating concurrently. |
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960 * |
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961 * Because the thread that does the sync barrier has left the STS, it |
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962 * is possible to be suspended for a Full GC or an evacuation pause |
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963 * could occur. This is actually safe, since the entering the sync |
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964 * barrier is one of the last things do_marking_step() does, and it |
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965 * doesn't manipulate any data structures afterwards. |
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966 */ |
342 | 967 |
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968 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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969 if (verbose_low()) { |
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970 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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971 } |
342 | 972 |
3316
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973 if (concurrent()) { |
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974 ConcurrentGCThread::stsLeave(); |
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975 } |
342 | 976 _first_overflow_barrier_sync.enter(); |
3316
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977 if (concurrent()) { |
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978 ConcurrentGCThread::stsJoin(); |
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979 } |
342 | 980 // at this point everyone should have synced up and not be doing any |
981 // more work | |
982 | |
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983 if (verbose_low()) { |
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984 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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985 } |
342 | 986 |
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987 // If we're executing the concurrent phase of marking, reset the marking |
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988 // state; otherwise the marking state is reset after reference processing, |
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989 // during the remark pause. |
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990 // If we reset here as a result of an overflow during the remark we will |
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991 // see assertion failures from any subsequent set_concurrency_and_phase() |
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992 // calls. |
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993 if (concurrent()) { |
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994 // let the task associated with with worker 0 do this |
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995 if (worker_id == 0) { |
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996 // task 0 is responsible for clearing the global data structures |
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997 // We should be here because of an overflow. During STW we should |
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998 // not clear the overflow flag since we rely on it being true when |
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999 // we exit this method to abort the pause and restart concurent |
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1000 // marking. |
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1001 reset_marking_state(true /* clear_overflow */); |
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1002 force_overflow()->update(); |
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1003 |
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1004 if (G1Log::fine()) { |
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1005 gclog_or_tty->date_stamp(PrintGCDateStamps); |
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1006 gclog_or_tty->stamp(PrintGCTimeStamps); |
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1007 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1008 } |
342 | 1009 } |
1010 } | |
1011 | |
1012 // after this, each task should reset its own data structures then | |
1013 // then go into the second barrier | |
1014 } | |
1015 | |
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1016 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1017 if (verbose_low()) { |
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1018 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1019 } |
342 | 1020 |
3316
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1021 if (concurrent()) { |
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1022 ConcurrentGCThread::stsLeave(); |
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1023 } |
342 | 1024 _second_overflow_barrier_sync.enter(); |
3316
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1025 if (concurrent()) { |
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1026 ConcurrentGCThread::stsJoin(); |
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1027 } |
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1028 // at this point everything should be re-initialized and ready to go |
342 | 1029 |
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1030 if (verbose_low()) { |
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1031 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1032 } |
342 | 1033 } |
1034 | |
3316
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1035 #ifndef PRODUCT |
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1036 void ForceOverflowSettings::init() { |
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1037 _num_remaining = G1ConcMarkForceOverflow; |
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1038 _force = false; |
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1039 update(); |
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1040 } |
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1041 |
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1042 void ForceOverflowSettings::update() { |
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1043 if (_num_remaining > 0) { |
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1044 _num_remaining -= 1; |
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1045 _force = true; |
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1046 } else { |
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1047 _force = false; |
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1048 } |
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1049 } |
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1050 |
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1051 bool ForceOverflowSettings::should_force() { |
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1052 if (_force) { |
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1053 _force = false; |
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1054 return true; |
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1055 } else { |
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1056 return false; |
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1057 } |
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1058 } |
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1059 #endif // !PRODUCT |
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1060 |
342 | 1061 class CMConcurrentMarkingTask: public AbstractGangTask { |
1062 private: | |
1063 ConcurrentMark* _cm; | |
1064 ConcurrentMarkThread* _cmt; | |
1065 | |
1066 public: | |
4728
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1067 void work(uint worker_id) { |
1023
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1068 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1069 "this should only be done by a conc GC thread"); |
1974
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1070 ResourceMark rm; |
342 | 1071 |
1072 double start_vtime = os::elapsedVTime(); | |
1073 | |
1074 ConcurrentGCThread::stsJoin(); | |
1075 | |
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1076 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1077 CMTask* the_task = _cm->task(worker_id); |
342 | 1078 the_task->record_start_time(); |
1079 if (!_cm->has_aborted()) { | |
1080 do { | |
1081 double start_vtime_sec = os::elapsedVTime(); | |
1082 double start_time_sec = os::elapsedTime(); | |
2174
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1083 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1084 |
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1085 the_task->do_marking_step(mark_step_duration_ms, |
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1086 true /* do_termination */, |
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1087 false /* is_serial*/); |
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1088 |
342 | 1089 double end_time_sec = os::elapsedTime(); |
1090 double end_vtime_sec = os::elapsedVTime(); | |
1091 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1092 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1093 _cm->clear_has_overflown(); | |
1094 | |
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1095 bool ret = _cm->do_yield_check(worker_id); |
342 | 1096 |
1097 jlong sleep_time_ms; | |
1098 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1099 sleep_time_ms = | |
1100 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1101 ConcurrentGCThread::stsLeave(); | |
1102 os::sleep(Thread::current(), sleep_time_ms, false); | |
1103 ConcurrentGCThread::stsJoin(); | |
1104 } | |
1105 double end_time2_sec = os::elapsedTime(); | |
1106 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1107 | |
1108 #if 0 | |
1109 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1110 "overhead %1.4lf", | |
1111 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1112 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1113 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1114 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1115 #endif | |
1116 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1117 } | |
1118 the_task->record_end_time(); | |
1023
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1119 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1120 |
1121 ConcurrentGCThread::stsLeave(); | |
1122 | |
1123 double end_vtime = os::elapsedVTime(); | |
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1124 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1125 } |
1126 | |
1127 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1128 ConcurrentMarkThread* cmt) : | |
1129 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1130 | |
1131 ~CMConcurrentMarkingTask() { } | |
1132 }; | |
1133 | |
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1134 // Calculates the number of active workers for a concurrent |
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1135 // phase. |
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1136 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1137 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1138 uint n_conc_workers = 0; |
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1139 if (!UseDynamicNumberOfGCThreads || |
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1140 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1141 !ForceDynamicNumberOfGCThreads)) { |
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1142 n_conc_workers = max_parallel_marking_threads(); |
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1143 } else { |
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1144 n_conc_workers = |
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1145 AdaptiveSizePolicy::calc_default_active_workers( |
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1146 max_parallel_marking_threads(), |
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1147 1, /* Minimum workers */ |
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1148 parallel_marking_threads(), |
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1149 Threads::number_of_non_daemon_threads()); |
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1150 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1151 // that scaling has already gone into "_max_parallel_marking_threads". |
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1152 } |
4711 | 1153 assert(n_conc_workers > 0, "Always need at least 1"); |
1154 return n_conc_workers; | |
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1155 } |
4711 | 1156 // If we are not running with any parallel GC threads we will not |
1157 // have spawned any marking threads either. Hence the number of | |
1158 // concurrent workers should be 0. | |
1159 return 0; | |
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1160 } |
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1161 |
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1162 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1163 // Currently, only survivors can be root regions. |
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1164 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1165 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1166 |
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1167 const uintx interval = PrefetchScanIntervalInBytes; |
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1168 HeapWord* curr = hr->bottom(); |
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1169 const HeapWord* end = hr->top(); |
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1170 while (curr < end) { |
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1171 Prefetch::read(curr, interval); |
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1172 oop obj = oop(curr); |
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1173 int size = obj->oop_iterate(&cl); |
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1174 assert(size == obj->size(), "sanity"); |
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1175 curr += size; |
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1176 } |
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1177 } |
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1178 |
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1179 class CMRootRegionScanTask : public AbstractGangTask { |
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1180 private: |
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1181 ConcurrentMark* _cm; |
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1182 |
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1183 public: |
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1184 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1185 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1186 |
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1187 void work(uint worker_id) { |
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1188 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1189 "this should only be done by a conc GC thread"); |
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1190 |
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1191 CMRootRegions* root_regions = _cm->root_regions(); |
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1192 HeapRegion* hr = root_regions->claim_next(); |
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1193 while (hr != NULL) { |
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1194 _cm->scanRootRegion(hr, worker_id); |
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1195 hr = root_regions->claim_next(); |
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1196 } |
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1197 } |
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1198 }; |
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1199 |
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1200 void ConcurrentMark::scanRootRegions() { |
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1201 // scan_in_progress() will have been set to true only if there was |
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1202 // at least one root region to scan. So, if it's false, we |
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1203 // should not attempt to do any further work. |
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1204 if (root_regions()->scan_in_progress()) { |
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1205 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1206 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1207 "Maximum number of marking threads exceeded"); |
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1208 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1209 |
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1210 CMRootRegionScanTask task(this); |
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1211 if (use_parallel_marking_threads()) { |
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1212 _parallel_workers->set_active_workers((int) active_workers); |
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1213 _parallel_workers->run_task(&task); |
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1214 } else { |
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1215 task.work(0); |
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1216 } |
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1217 |
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1218 // It's possible that has_aborted() is true here without actually |
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1219 // aborting the survivor scan earlier. This is OK as it's |
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1220 // mainly used for sanity checking. |
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1221 root_regions()->scan_finished(); |
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1222 } |
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1223 } |
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1224 |
342 | 1225 void ConcurrentMark::markFromRoots() { |
1226 // we might be tempted to assert that: | |
1227 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1228 // "inconsistent argument?"); | |
1229 // However that wouldn't be right, because it's possible that | |
1230 // a safepoint is indeed in progress as a younger generation | |
1231 // stop-the-world GC happens even as we mark in this generation. | |
1232 | |
1233 _restart_for_overflow = false; | |
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1234 force_overflow_conc()->init(); |
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1235 |
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1236 // _g1h has _n_par_threads |
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1237 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1238 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1239 "Maximum number of marking threads exceeded"); |
4711 | 1240 |
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1241 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1242 |
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1243 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1244 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1245 |
1246 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1247 if (use_parallel_marking_threads()) { |
4711 | 1248 _parallel_workers->set_active_workers((int)active_workers); |
1249 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1250 // and the decisions on that MT processing is made elsewhere. | |
1251 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1252 _parallel_workers->run_task(&markingTask); |
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1253 } else { |
342 | 1254 markingTask.work(0); |
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1255 } |
342 | 1256 print_stats(); |
1257 } | |
1258 | |
1259 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1260 // world is stopped at this checkpoint | |
1261 assert(SafepointSynchronize::is_at_safepoint(), | |
1262 "world should be stopped"); | |
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1263 |
342 | 1264 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1265 | |
1266 // If a full collection has happened, we shouldn't do this. | |
1267 if (has_aborted()) { | |
1268 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1269 return; | |
1270 } | |
1271 | |
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1272 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1273 |
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1274 if (VerifyDuringGC) { |
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1275 HandleMark hm; // handle scope |
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1276 Universe::heap()->prepare_for_verify(); |
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1277 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1278 " VerifyDuringGC:(before)"); |
845
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1279 } |
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1280 |
342 | 1281 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1282 g1p->record_concurrent_mark_remark_start(); | |
1283 | |
1284 double start = os::elapsedTime(); | |
1285 | |
1286 checkpointRootsFinalWork(); | |
1287 | |
1288 double mark_work_end = os::elapsedTime(); | |
1289 | |
1290 weakRefsWork(clear_all_soft_refs); | |
1291 | |
1292 if (has_overflown()) { | |
1293 // Oops. We overflowed. Restart concurrent marking. | |
1294 _restart_for_overflow = true; | |
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1295 if (G1TraceMarkStackOverflow) { |
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1296 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1297 } |
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1298 |
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1299 // Verify the heap w.r.t. the previous marking bitmap. |
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1300 if (VerifyDuringGC) { |
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1301 HandleMark hm; // handle scope |
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1302 Universe::heap()->prepare_for_verify(); |
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1303 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1304 " VerifyDuringGC:(overflow)"); |
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1305 } |
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1306 |
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1307 // Clear the marking state because we will be restarting |
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1308 // marking due to overflowing the global mark stack. |
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1309 reset_marking_state(); |
342 | 1310 } else { |
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1311 // Aggregate the per-task counting data that we have accumulated |
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1312 // while marking. |
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1313 aggregate_count_data(); |
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1314 |
2149 | 1315 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1316 // We're done with marking. |
1317
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1317 // This is the end of the marking cycle, we're expected all |
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1318 // threads to have SATB queues with active set to true. |
2149 | 1319 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1320 true /* expected_active */); | |
811 | 1321 |
1322 if (VerifyDuringGC) { | |
845
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1323 HandleMark hm; // handle scope |
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1324 Universe::heap()->prepare_for_verify(); |
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1325 Universe::verify(VerifyOption_G1UseNextMarking, |
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1326 " VerifyDuringGC:(after)"); |
811 | 1327 } |
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1328 assert(!restart_for_overflow(), "sanity"); |
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1329 // Completely reset the marking state since marking completed |
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1330 set_non_marking_state(); |
2174
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1331 } |
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1332 |
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1333 // Expand the marking stack, if we have to and if we can. |
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1334 if (_markStack.should_expand()) { |
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1335 _markStack.expand(); |
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1336 } |
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1337 |
342 | 1338 // Statistics |
1339 double now = os::elapsedTime(); | |
1340 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1341 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1342 _remark_times.add((now - start) * 1000.0); | |
1343 | |
1344 g1p->record_concurrent_mark_remark_end(); | |
1345 } | |
1346 | |
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1347 // Base class of the closures that finalize and verify the |
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1348 // liveness counting data. |
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1349 class CMCountDataClosureBase: public HeapRegionClosure { |
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1350 protected: |
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1351 G1CollectedHeap* _g1h; |
342 | 1352 ConcurrentMark* _cm; |
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1353 CardTableModRefBS* _ct_bs; |
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1354 |
342 | 1355 BitMap* _region_bm; |
1356 BitMap* _card_bm; | |
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1357 |
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1358 // Takes a region that's not empty (i.e., it has at least one |
829 | 1359 // live object in it and sets its corresponding bit on the region |
1360 // bitmap to 1. If the region is "starts humongous" it will also set | |
1361 // to 1 the bits on the region bitmap that correspond to its | |
1362 // associated "continues humongous" regions. | |
1363 void set_bit_for_region(HeapRegion* hr) { | |
1364 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1365 | |
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1366 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1367 if (!hr->startsHumongous()) { |
1368 // Normal (non-humongous) case: just set the bit. | |
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1369 _region_bm->par_at_put(index, true); |
829 | 1370 } else { |
1371 // Starts humongous case: calculate how many regions are part of | |
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1372 // this humongous region and then set the bit range. |
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1373 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1374 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1375 } |
1376 } | |
1377 | |
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1378 public: |
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1379 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1380 BitMap* region_bm, BitMap* card_bm): |
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1381 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1382 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1383 _region_bm(region_bm), _card_bm(card_bm) { } |
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1384 }; |
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1385 |
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1386 // Closure that calculates the # live objects per region. Used |
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1387 // for verification purposes during the cleanup pause. |
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1388 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1389 CMBitMapRO* _bm; |
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1390 size_t _region_marked_bytes; |
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1391 |
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1392 public: |
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1393 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1394 BitMap* region_bm, BitMap* card_bm) : |
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1395 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1396 _bm(bm), _region_marked_bytes(0) { } |
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1397 |
342 | 1398 bool doHeapRegion(HeapRegion* hr) { |
1399 | |
639 | 1400 if (hr->continuesHumongous()) { |
829 | 1401 // We will ignore these here and process them when their |
1402 // associated "starts humongous" region is processed (see | |
1403 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1404 // associated "starts humongous" region to have their bit set to | |
1405 // 1 since, due to the region chunking in the parallel region | |
1406 // iteration, a "continues humongous" region might be visited | |
1407 // before its associated "starts humongous". | |
639 | 1408 return false; |
1409 } | |
342 | 1410 |
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1411 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1412 HeapWord* start = hr->bottom(); |
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1413 |
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1414 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1415 err_msg("Preconditions not met - " |
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1416 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1417 start, ntams, hr->end())); |
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1418 |
342 | 1419 // Find the first marked object at or after "start". |
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1420 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1421 |
342 | 1422 size_t marked_bytes = 0; |
1423 | |
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1424 while (start < ntams) { |
342 | 1425 oop obj = oop(start); |
1426 int obj_sz = obj->size(); | |
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1427 HeapWord* obj_end = start + obj_sz; |
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1428 |
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1429 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1430 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1431 |
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1432 // Note: if we're looking at the last region in heap - obj_end |
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1433 // could be actually just beyond the end of the heap; end_idx |
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1434 // will then correspond to a (non-existent) card that is also |
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1435 // just beyond the heap. |
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1436 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1437 // end of object is not card aligned - increment to cover |
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1438 // all the cards spanned by the object |
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1439 end_idx += 1; |
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1440 } |
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1441 |
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1442 // Set the bits in the card BM for the cards spanned by this object. |
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1443 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1444 |
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1445 // Add the size of this object to the number of marked bytes. |
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1446 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1447 |
342 | 1448 // Find the next marked object after this one. |
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1449 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1450 } |
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1451 |
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1452 // Mark the allocated-since-marking portion... |
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1453 HeapWord* top = hr->top(); |
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1454 if (ntams < top) { |
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1455 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1456 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1457 |
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1458 // Note: if we're looking at the last region in heap - top |
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1459 // could be actually just beyond the end of the heap; end_idx |
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1460 // will then correspond to a (non-existent) card that is also |
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1461 // just beyond the heap. |
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1462 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1463 // end of object is not card aligned - increment to cover |
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1464 // all the cards spanned by the object |
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1465 end_idx += 1; |
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1466 } |
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1467 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1468 |
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1469 // This definitely means the region has live objects. |
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1470 set_bit_for_region(hr); |
342 | 1471 } |
1472 | |
1473 // Update the live region bitmap. | |
1474 if (marked_bytes > 0) { | |
829 | 1475 set_bit_for_region(hr); |
342 | 1476 } |
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1477 |
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1478 // Set the marked bytes for the current region so that |
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1479 // it can be queried by a calling verificiation routine |
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1480 _region_marked_bytes = marked_bytes; |
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1481 |
342 | 1482 return false; |
1483 } | |
1484 | |
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1485 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1486 }; |
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1487 |
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1488 // Heap region closure used for verifying the counting data |
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1489 // that was accumulated concurrently and aggregated during |
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1490 // the remark pause. This closure is applied to the heap |
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1491 // regions during the STW cleanup pause. |
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1492 |
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1493 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1494 G1CollectedHeap* _g1h; |
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1495 ConcurrentMark* _cm; |
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1496 CalcLiveObjectsClosure _calc_cl; |
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1497 BitMap* _region_bm; // Region BM to be verified |
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1498 BitMap* _card_bm; // Card BM to be verified |
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1499 bool _verbose; // verbose output? |
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1500 |
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1501 BitMap* _exp_region_bm; // Expected Region BM values |
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1502 BitMap* _exp_card_bm; // Expected card BM values |
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1503 |
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1504 int _failures; |
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1505 |
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1506 public: |
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1507 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1508 BitMap* region_bm, |
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1509 BitMap* card_bm, |
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1510 BitMap* exp_region_bm, |
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1511 BitMap* exp_card_bm, |
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1512 bool verbose) : |
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1513 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1514 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1515 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1516 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1517 _failures(0) { } |
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1518 |
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1519 int failures() const { return _failures; } |
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1520 |
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1521 bool doHeapRegion(HeapRegion* hr) { |
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1522 if (hr->continuesHumongous()) { |
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1523 // We will ignore these here and process them when their |
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1524 // associated "starts humongous" region is processed (see |
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1525 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1526 // associated "starts humongous" region to have their bit set to |
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1527 // 1 since, due to the region chunking in the parallel region |
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1528 // iteration, a "continues humongous" region might be visited |
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1529 // before its associated "starts humongous". |
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1530 return false; |
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1531 } |
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1532 |
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1533 int failures = 0; |
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1534 |
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1535 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1536 // this region and set the corresponding bits in the expected region |
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1537 // and card bitmaps. |
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1538 bool res = _calc_cl.doHeapRegion(hr); |
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1539 assert(res == false, "should be continuing"); |
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|
1540 |
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1541 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1542 Mutex::_no_safepoint_check_flag); |
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1543 |
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1544 // Verify the marked bytes for this region. |
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1545 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1546 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1547 |
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1548 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1549 // we have missed accounting some objects during the actual marking. |
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1550 if (exp_marked_bytes > act_marked_bytes) { |
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1551 if (_verbose) { |
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1552 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1553 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1554 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1555 } |
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|
1556 failures += 1; |
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|
1557 } |
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|
1558 |
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1559 // Verify the bit, for this region, in the actual and expected |
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1560 // (which was just calculated) region bit maps. |
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1561 // We're not OK if the bit in the calculated expected region |
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1562 // bitmap is set and the bit in the actual region bitmap is not. |
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1563 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
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1564 |
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1565 bool expected = _exp_region_bm->at(index); |
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1566 bool actual = _region_bm->at(index); |
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1567 if (expected && !actual) { |
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1568 if (_verbose) { |
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1569 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1570 "expected: %s, actual: %s", |
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1571 hr->hrs_index(), |
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1572 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1573 } |
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|
1574 failures += 1; |
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1575 } |
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|
1576 |
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1577 // Verify that the card bit maps for the cards spanned by the current |
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1578 // region match. We have an error if we have a set bit in the expected |
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1579 // bit map and the corresponding bit in the actual bitmap is not set. |
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1580 |
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1581 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1582 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1583 |
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1584 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1585 expected = _exp_card_bm->at(i); |
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1586 actual = _card_bm->at(i); |
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1587 |
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1588 if (expected && !actual) { |
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1589 if (_verbose) { |
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1590 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1591 "expected: %s, actual: %s", |
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1592 hr->hrs_index(), i, |
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1593 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1594 } |
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1595 failures += 1; |
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1596 } |
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1597 } |
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1598 |
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1599 if (failures > 0 && _verbose) { |
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1600 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1601 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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1602 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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1603 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1604 } |
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1605 |
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1606 _failures += failures; |
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1607 |
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1608 // We could stop iteration over the heap when we |
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1609 // find the first violating region by returning true. |
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1610 return false; |
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1611 } |
342 | 1612 }; |
1613 | |
1614 | |
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1615 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1616 protected: |
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1617 G1CollectedHeap* _g1h; |
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1618 ConcurrentMark* _cm; |
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1619 BitMap* _actual_region_bm; |
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1620 BitMap* _actual_card_bm; |
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1621 |
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1622 uint _n_workers; |
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1623 |
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1624 BitMap* _expected_region_bm; |
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1625 BitMap* _expected_card_bm; |
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1626 |
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1627 int _failures; |
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1628 bool _verbose; |
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1629 |
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1630 public: |
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1631 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1632 BitMap* region_bm, BitMap* card_bm, |
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1633 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1634 : AbstractGangTask("G1 verify final counting"), |
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1635 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1636 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1637 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1638 _failures(0), _verbose(false), |
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1639 _n_workers(0) { |
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1640 assert(VerifyDuringGC, "don't call this otherwise"); |
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1641 |
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1642 // Use the value already set as the number of active threads |
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1643 // in the call to run_task(). |
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1644 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1645 assert( _g1h->workers()->active_workers() > 0, |
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1646 "Should have been previously set"); |
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1647 _n_workers = _g1h->workers()->active_workers(); |
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1648 } else { |
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|
1649 _n_workers = 1; |
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|
1650 } |
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|
1651 |
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1652 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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1653 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1654 |
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|
1655 _verbose = _cm->verbose_medium(); |
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|
1656 } |
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|
1657 |
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|
1658 void work(uint worker_id) { |
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1659 assert(worker_id < _n_workers, "invariant"); |
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|
1660 |
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1661 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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1662 _actual_region_bm, _actual_card_bm, |
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|
1663 _expected_region_bm, |
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|
1664 _expected_card_bm, |
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|
1665 _verbose); |
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|
1666 |
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|
1667 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1668 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1669 worker_id, |
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|
1670 _n_workers, |
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|
1671 HeapRegion::VerifyCountClaimValue); |
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|
1672 } else { |
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|
1673 _g1h->heap_region_iterate(&verify_cl); |
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|
1674 } |
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|
1675 |
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|
1676 Atomic::add(verify_cl.failures(), &_failures); |
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|
1677 } |
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|
1678 |
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|
1679 int failures() const { return _failures; } |
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|
1680 }; |
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|
1681 |
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1682 // Closure that finalizes the liveness counting data. |
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1683 // Used during the cleanup pause. |
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|
1684 // Sets the bits corresponding to the interval [NTAMS, top] |
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|
1685 // (which contains the implicitly live objects) in the |
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|
1686 // card liveness bitmap. Also sets the bit for each region, |
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|
1687 // containing live data, in the region liveness bitmap. |
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|
1688 |
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|
1689 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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|
1690 public: |
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|
1691 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
4836
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|
1692 BitMap* region_bm, |
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|
1693 BitMap* card_bm) : |
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|
1694 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1695 |
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|
1696 bool doHeapRegion(HeapRegion* hr) { |
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|
1697 |
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|
1698 if (hr->continuesHumongous()) { |
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|
1699 // We will ignore these here and process them when their |
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1700 // associated "starts humongous" region is processed (see |
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|
1701 // set_bit_for_heap_region()). Note that we cannot rely on their |
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|
1702 // associated "starts humongous" region to have their bit set to |
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|
1703 // 1 since, due to the region chunking in the parallel region |
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|
1704 // iteration, a "continues humongous" region might be visited |
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|
1705 // before its associated "starts humongous". |
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1706 return false; |
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|
1707 } |
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|
1708 |
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|
1709 HeapWord* ntams = hr->next_top_at_mark_start(); |
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|
1710 HeapWord* top = hr->top(); |
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|
1711 |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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6011
diff
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|
1712 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1713 |
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|
1714 // Mark the allocated-since-marking portion... |
d30fa85f9994
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|
1715 if (ntams < top) { |
d30fa85f9994
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|
1716 // This definitely means the region has live objects. |
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|
1717 set_bit_for_region(hr); |
6812
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|
1718 |
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|
1719 // Now set the bits in the card bitmap for [ntams, top) |
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|
1720 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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|
1721 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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|
1722 |
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|
1723 // Note: if we're looking at the last region in heap - top |
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1724 // could be actually just beyond the end of the heap; end_idx |
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1725 // will then correspond to a (non-existent) card that is also |
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|
1726 // just beyond the heap. |
988bf00cc564
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|
1727 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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|
1728 // end of object is not card aligned - increment to cover |
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|
1729 // all the cards spanned by the object |
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|
1730 end_idx += 1; |
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|
1731 } |
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|
1732 |
988bf00cc564
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|
1733 assert(end_idx <= _card_bm->size(), |
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|
1734 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1735 end_idx, _card_bm->size())); |
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|
1736 assert(start_idx < _card_bm->size(), |
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|
1737 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1738 start_idx, _card_bm->size())); |
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|
1739 |
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|
1740 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
da91efe96a93
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|
1741 } |
4836
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|
1742 |
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|
1743 // Set the bit for the region if it contains live data |
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|
1744 if (hr->next_marked_bytes() > 0) { |
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|
1745 set_bit_for_region(hr); |
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|
1746 } |
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|
1747 |
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|
1748 return false; |
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|
1749 } |
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|
1750 }; |
342 | 1751 |
1752 class G1ParFinalCountTask: public AbstractGangTask { | |
1753 protected: | |
1754 G1CollectedHeap* _g1h; | |
4836
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|
1755 ConcurrentMark* _cm; |
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|
1756 BitMap* _actual_region_bm; |
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|
1757 BitMap* _actual_card_bm; |
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1758 |
4728
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|
1759 uint _n_workers; |
4836
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1760 |
342 | 1761 public: |
4836
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1762 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1763 : AbstractGangTask("G1 final counting"), |
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1764 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1765 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1766 _n_workers(0) { |
4095
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diff
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|
1767 // Use the value already set as the number of active threads |
6011 | 1768 // in the call to run_task(). |
4095
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1769 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1770 assert( _g1h->workers()->active_workers() > 0, |
bca17e38de00
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|
1771 "Should have been previously set"); |
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|
1772 _n_workers = _g1h->workers()->active_workers(); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
1773 } else { |
342 | 1774 _n_workers = 1; |
3776
23d434c6290d
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|
1775 } |
342 | 1776 } |
1777 | |
4728
441e946dc1af
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|
1778 void work(uint worker_id) { |
4836
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|
1779 assert(worker_id < _n_workers, "invariant"); |
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|
1780 |
6812
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|
1781 FinalCountDataUpdateClosure final_update_cl(_g1h, |
4836
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1782 _actual_region_bm, |
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1783 _actual_card_bm); |
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|
1784 |
1833
8b10f48633dc
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|
1785 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4836
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1786 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1787 worker_id, |
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|
1788 _n_workers, |
355 | 1789 HeapRegion::FinalCountClaimValue); |
342 | 1790 } else { |
4836
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1791 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1792 } |
1793 } | |
1794 }; | |
1795 | |
1796 class G1ParNoteEndTask; | |
1797 | |
1798 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1799 G1CollectedHeap* _g1; | |
1800 int _worker_num; | |
1801 size_t _max_live_bytes; | |
6010
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1802 uint _regions_claimed; |
342 | 1803 size_t _freed_bytes; |
2173 | 1804 FreeRegionList* _local_cleanup_list; |
4072 | 1805 OldRegionSet* _old_proxy_set; |
2173 | 1806 HumongousRegionSet* _humongous_proxy_set; |
1807 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1808 double _claimed_region_time; |
1809 double _max_region_time; | |
1810 | |
1811 public: | |
1812 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1813 int worker_num, |
1814 FreeRegionList* local_cleanup_list, | |
4072 | 1815 OldRegionSet* old_proxy_set, |
2173 | 1816 HumongousRegionSet* humongous_proxy_set, |
4093
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1817 HRRSCleanupTask* hrrs_cleanup_task) : |
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1818 _g1(g1), _worker_num(worker_num), |
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1819 _max_live_bytes(0), _regions_claimed(0), |
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|
1820 _freed_bytes(0), |
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|
1821 _claimed_region_time(0.0), _max_region_time(0.0), |
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|
1822 _local_cleanup_list(local_cleanup_list), |
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1823 _old_proxy_set(old_proxy_set), |
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1824 _humongous_proxy_set(humongous_proxy_set), |
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|
1825 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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|
1826 |
342 | 1827 size_t freed_bytes() { return _freed_bytes; } |
1828 | |
4093
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|
1829 bool doHeapRegion(HeapRegion *hr) { |
6254
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1830 if (hr->continuesHumongous()) { |
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|
1831 return false; |
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|
1832 } |
4093
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|
1833 // We use a claim value of zero here because all regions |
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|
1834 // were claimed with value 1 in the FinalCount task. |
6254
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1835 _g1->reset_gc_time_stamps(hr); |
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|
1836 double start = os::elapsedTime(); |
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|
1837 _regions_claimed++; |
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|
1838 hr->note_end_of_marking(); |
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|
1839 _max_live_bytes += hr->max_live_bytes(); |
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1840 _g1->free_region_if_empty(hr, |
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1841 &_freed_bytes, |
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|
1842 _local_cleanup_list, |
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|
1843 _old_proxy_set, |
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1844 _humongous_proxy_set, |
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|
1845 _hrrs_cleanup_task, |
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|
1846 true /* par */); |
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|
1847 double region_time = (os::elapsedTime() - start); |
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|
1848 _claimed_region_time += region_time; |
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|
1849 if (region_time > _max_region_time) { |
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|
1850 _max_region_time = region_time; |
4093
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|
1851 } |
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|
1852 return false; |
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|
1853 } |
342 | 1854 |
1855 size_t max_live_bytes() { return _max_live_bytes; } | |
6010
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|
1856 uint regions_claimed() { return _regions_claimed; } |
342 | 1857 double claimed_region_time_sec() { return _claimed_region_time; } |
1858 double max_region_time_sec() { return _max_region_time; } | |
1859 }; | |
1860 | |
1861 class G1ParNoteEndTask: public AbstractGangTask { | |
1862 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1863 |
342 | 1864 protected: |
1865 G1CollectedHeap* _g1h; | |
1866 size_t _max_live_bytes; | |
1867 size_t _freed_bytes; | |
2152 | 1868 FreeRegionList* _cleanup_list; |
1869 | |
342 | 1870 public: |
1871 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1872 FreeRegionList* cleanup_list) : |
342 | 1873 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1874 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1875 |
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1876 void work(uint worker_id) { |
342 | 1877 double start = os::elapsedTime(); |
2173 | 1878 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1879 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1880 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1881 HRRSCleanupTask hrrs_cleanup_task; | |
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1882 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1883 &old_proxy_set, |
2173 | 1884 &humongous_proxy_set, |
1885 &hrrs_cleanup_task); | |
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1886 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1887 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1888 _g1h->workers()->active_workers(), |
355 | 1889 HeapRegion::NoteEndClaimValue); |
342 | 1890 } else { |
1891 _g1h->heap_region_iterate(&g1_note_end); | |
1892 } | |
1893 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1894 | |
2152 | 1895 // Now update the lists |
1896 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1897 NULL /* free_list */, | |
4072 | 1898 &old_proxy_set, |
2173 | 1899 &humongous_proxy_set, |
2152 | 1900 true /* par */); |
342 | 1901 { |
1902 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1903 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1904 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1905 |
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1906 // If we iterate over the global cleanup list at the end of |
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1907 // cleanup to do this printing we will not guarantee to only |
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1908 // generate output for the newly-reclaimed regions (the list |
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1909 // might not be empty at the beginning of cleanup; we might |
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1910 // still be working on its previous contents). So we do the |
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1911 // printing here, before we append the new regions to the global |
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1912 // cleanup list. |
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1913 |
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1914 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1915 if (hr_printer->is_active()) { |
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1916 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1917 while (iter.more_available()) { |
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1918 HeapRegion* hr = iter.get_next(); |
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1919 hr_printer->cleanup(hr); |
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1920 } |
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1921 } |
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1922 |
2173 | 1923 _cleanup_list->add_as_tail(&local_cleanup_list); |
1924 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1925 | |
1926 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1927 } |
1928 } | |
1929 size_t max_live_bytes() { return _max_live_bytes; } | |
1930 size_t freed_bytes() { return _freed_bytes; } | |
1931 }; | |
1932 | |
1933 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1934 protected: | |
1935 G1RemSet* _g1rs; | |
1936 BitMap* _region_bm; | |
1937 BitMap* _card_bm; | |
1938 public: | |
1939 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1940 BitMap* region_bm, BitMap* card_bm) : | |
1941 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1942 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1943 |
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1944 void work(uint worker_id) { |
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1945 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1946 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1947 HeapRegion::ScrubRemSetClaimValue); |
342 | 1948 } else { |
1949 _g1rs->scrub(_region_bm, _card_bm); | |
1950 } | |
1951 } | |
1952 | |
1953 }; | |
1954 | |
1955 void ConcurrentMark::cleanup() { | |
1956 // world is stopped at this checkpoint | |
1957 assert(SafepointSynchronize::is_at_safepoint(), | |
1958 "world should be stopped"); | |
1959 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1960 | |
1961 // If a full collection has happened, we shouldn't do this. | |
1962 if (has_aborted()) { | |
1963 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1964 return; | |
1965 } | |
1966 | |
4072 | 1967 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1968 g1h->verify_region_sets_optional(); |
1969 | |
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1970 if (VerifyDuringGC) { |
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1971 HandleMark hm; // handle scope |
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1972 Universe::heap()->prepare_for_verify(); |
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1973 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1974 " VerifyDuringGC:(before)"); |
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1975 } |
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1976 |
342 | 1977 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1978 g1p->record_concurrent_mark_cleanup_start(); | |
1979 | |
1980 double start = os::elapsedTime(); | |
1981 | |
2173 | 1982 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1983 | |
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1984 uint n_workers; |
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1985 |
342 | 1986 // Do counting once more with the world stopped for good measure. |
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1987 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1988 |
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1989 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1990 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1991 "sanity check"); |
1992 | |
4711 | 1993 g1h->set_par_threads(); |
1994 n_workers = g1h->n_par_threads(); | |
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1995 assert(g1h->n_par_threads() == n_workers, |
4711 | 1996 "Should not have been reset"); |
342 | 1997 g1h->workers()->run_task(&g1_par_count_task); |
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1998 // Done with the parallel phase so reset to 0. |
342 | 1999 g1h->set_par_threads(0); |
355 | 2000 |
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2001 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2002 "sanity check"); |
342 | 2003 } else { |
4711 | 2004 n_workers = 1; |
342 | 2005 g1_par_count_task.work(0); |
2006 } | |
2007 | |
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2008 if (VerifyDuringGC) { |
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2009 // Verify that the counting data accumulated during marking matches |
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2010 // that calculated by walking the marking bitmap. |
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2011 |
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2012 // Bitmaps to hold expected values |
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2013 BitMap expected_region_bm(_region_bm.size(), false); |
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2014 BitMap expected_card_bm(_card_bm.size(), false); |
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2015 |
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2016 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2017 &_region_bm, |
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2018 &_card_bm, |
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2019 &expected_region_bm, |
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2020 &expected_card_bm); |
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2021 |
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2022 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2023 g1h->set_par_threads((int)n_workers); |
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2024 g1h->workers()->run_task(&g1_par_verify_task); |
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2025 // Done with the parallel phase so reset to 0. |
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2026 g1h->set_par_threads(0); |
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2027 |
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2028 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2029 "sanity check"); |
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2030 } else { |
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2031 g1_par_verify_task.work(0); |
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2032 } |
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2033 |
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2034 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2035 } |
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2036 |
342 | 2037 size_t start_used_bytes = g1h->used(); |
2038 g1h->set_marking_complete(); | |
2039 | |
2040 double count_end = os::elapsedTime(); | |
2041 double this_final_counting_time = (count_end - start); | |
2042 _total_counting_time += this_final_counting_time; | |
2043 | |
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2044 if (G1PrintRegionLivenessInfo) { |
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2045 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2046 _g1h->heap_region_iterate(&cl); |
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2047 } |
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2048 |
342 | 2049 // Install newly created mark bitMap as "prev". |
2050 swapMarkBitMaps(); | |
2051 | |
2052 g1h->reset_gc_time_stamp(); | |
2053 | |
2054 // Note end of marking in all heap regions. | |
2152 | 2055 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2056 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2057 g1h->set_par_threads((int)n_workers); |
342 | 2058 g1h->workers()->run_task(&g1_par_note_end_task); |
2059 g1h->set_par_threads(0); | |
355 | 2060 |
2061 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2062 "sanity check"); | |
342 | 2063 } else { |
2064 g1_par_note_end_task.work(0); | |
2065 } | |
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2066 g1h->check_gc_time_stamps(); |
2152 | 2067 |
2068 if (!cleanup_list_is_empty()) { | |
2069 // The cleanup list is not empty, so we'll have to process it | |
2070 // concurrently. Notify anyone else that might be wanting free | |
2071 // regions that there will be more free regions coming soon. | |
2072 g1h->set_free_regions_coming(); | |
2073 } | |
342 | 2074 |
2075 // call below, since it affects the metric by which we sort the heap | |
2076 // regions. | |
2077 if (G1ScrubRemSets) { | |
2078 double rs_scrub_start = os::elapsedTime(); | |
2079 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2080 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2081 g1h->set_par_threads((int)n_workers); |
342 | 2082 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2083 g1h->set_par_threads(0); | |
355 | 2084 |
2085 assert(g1h->check_heap_region_claim_values( | |
2086 HeapRegion::ScrubRemSetClaimValue), | |
2087 "sanity check"); | |
342 | 2088 } else { |
2089 g1_par_scrub_rs_task.work(0); | |
2090 } | |
2091 | |
2092 double rs_scrub_end = os::elapsedTime(); | |
2093 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2094 _total_rs_scrub_time += this_rs_scrub_time; | |
2095 } | |
2096 | |
2097 // this will also free any regions totally full of garbage objects, | |
2098 // and sort the regions. | |
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2099 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2100 |
2101 // Statistics. | |
2102 double end = os::elapsedTime(); | |
2103 _cleanup_times.add((end - start) * 1000.0); | |
2104 | |
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2105 if (G1Log::fine()) { |
342 | 2106 g1h->print_size_transition(gclog_or_tty, |
2107 start_used_bytes, | |
2108 g1h->used(), | |
2109 g1h->capacity()); | |
2110 } | |
2111 | |
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2112 // Clean up will have freed any regions completely full of garbage. |
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2113 // Update the soft reference policy with the new heap occupancy. |
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2114 Universe::update_heap_info_at_gc(); |
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2115 |
342 | 2116 // We need to make this be a "collection" so any collection pause that |
2117 // races with it goes around and waits for completeCleanup to finish. | |
2118 g1h->increment_total_collections(); | |
2119 | |
4830
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2120 // We reclaimed old regions so we should calculate the sizes to make |
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2121 // sure we update the old gen/space data. |
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2122 g1h->g1mm()->update_sizes(); |
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2123 |
751 | 2124 if (VerifyDuringGC) { |
845
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2125 HandleMark hm; // handle scope |
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2126 Universe::heap()->prepare_for_verify(); |
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2127 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2128 " VerifyDuringGC:(after)"); |
342 | 2129 } |
2152 | 2130 |
2131 g1h->verify_region_sets_optional(); | |
342 | 2132 } |
2133 | |
2134 void ConcurrentMark::completeCleanup() { | |
2135 if (has_aborted()) return; | |
2136 | |
2152 | 2137 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2138 | |
2139 _cleanup_list.verify_optional(); | |
2361 | 2140 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2141 |
2142 if (G1ConcRegionFreeingVerbose) { | |
2143 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2144 "cleanup list has %u entries", |
2152 | 2145 _cleanup_list.length()); |
2146 } | |
2147 | |
2148 // Noone else should be accessing the _cleanup_list at this point, | |
2149 // so it's not necessary to take any locks | |
2150 while (!_cleanup_list.is_empty()) { | |
2151 HeapRegion* hr = _cleanup_list.remove_head(); | |
2152 assert(hr != NULL, "the list was not empty"); | |
3317
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2153 hr->par_clear(); |
2361 | 2154 tmp_free_list.add_as_tail(hr); |
2152 | 2155 |
2156 // Instead of adding one region at a time to the secondary_free_list, | |
2157 // we accumulate them in the local list and move them a few at a | |
2158 // time. This also cuts down on the number of notify_all() calls | |
2159 // we do during this process. We'll also append the local list when | |
2160 // _cleanup_list is empty (which means we just removed the last | |
2161 // region from the _cleanup_list). | |
2361 | 2162 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2163 _cleanup_list.is_empty()) { |
2164 if (G1ConcRegionFreeingVerbose) { | |
2165 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2166 "appending %u entries to the secondary_free_list, " |
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2167 "cleanup list still has %u entries", |
2361 | 2168 tmp_free_list.length(), |
2152 | 2169 _cleanup_list.length()); |
342 | 2170 } |
2152 | 2171 |
2172 { | |
2173 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2174 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2175 SecondaryFreeList_lock->notify_all(); |
2176 } | |
2177 | |
2178 if (G1StressConcRegionFreeing) { | |
2179 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2180 os::sleep(Thread::current(), (jlong) 1, false); | |
2181 } | |
2182 } | |
342 | 2183 } |
2184 } | |
2361 | 2185 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2186 } |
2187 | |
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2188 // Supporting Object and Oop closures for reference discovery |
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2189 // and processing in during marking |
2174
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2190 |
2037
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|
2191 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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|
2192 HeapWord* addr = (HeapWord*)obj; |
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|
2193 return addr != NULL && |
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|
2194 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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|
2195 } |
342 | 2196 |
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2197 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
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2198 // Uses the CMTask associated with a worker thread (for serial reference |
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2199 // processing the CMTask for worker 0 is used) to preserve (mark) and |
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|
2200 // trace referent objects. |
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|
2201 // |
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2202 // Using the CMTask and embedded local queues avoids having the worker |
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|
2203 // threads operating on the global mark stack. This reduces the risk |
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|
2204 // of overflowing the stack - which we would rather avoid at this late |
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|
2205 // state. Also using the tasks' local queues removes the potential |
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2206 // of the workers interfering with each other that could occur if |
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|
2207 // operating on the global stack. |
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|
2208 |
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|
2209 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
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|
2210 ConcurrentMark* _cm; |
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2211 CMTask* _task; |
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|
2212 int _ref_counter_limit; |
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|
2213 int _ref_counter; |
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|
2214 bool _is_serial; |
2174
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|
2215 public: |
8787
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2216 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2217 _cm(cm), _task(task), _is_serial(is_serial), |
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2218 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
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|
2219 assert(_ref_counter_limit > 0, "sanity"); |
8787
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2220 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
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|
2221 _ref_counter = _ref_counter_limit; |
234761c55641
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|
2222 } |
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|
2223 |
234761c55641
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|
2224 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
234761c55641
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|
2225 virtual void do_oop( oop* p) { do_oop_work(p); } |
234761c55641
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|
2226 |
234761c55641
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|
2227 template <class T> void do_oop_work(T* p) { |
234761c55641
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2152
diff
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|
2228 if (!_cm->has_overflown()) { |
234761c55641
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|
2229 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
2230 if (_cm->verbose_high()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
2231 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
234761c55641
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|
2232 "*"PTR_FORMAT" = "PTR_FORMAT, |
6862
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|
2233 _task->worker_id(), p, (void*) obj); |
3776
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|
2234 } |
2174
234761c55641
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|
2235 |
234761c55641
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|
2236 _task->deal_with_reference(obj); |
234761c55641
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2152
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|
2237 _ref_counter--; |
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|
2238 |
234761c55641
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|
2239 if (_ref_counter == 0) { |
8014
f90b9bceb8e5
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|
2240 // We have dealt with _ref_counter_limit references, pushing them |
f90b9bceb8e5
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|
2241 // and objects reachable from them on to the local stack (and |
f90b9bceb8e5
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|
2242 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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|
2243 // process these entries. |
f90b9bceb8e5
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|
2244 // |
f90b9bceb8e5
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|
2245 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
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|
2246 // there's nothing more to do (i.e. we're done with the entries that |
f90b9bceb8e5
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|
2247 // were pushed as a result of the CMTask::deal_with_reference() calls |
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|
2248 // above) or we overflow. |
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|
2249 // |
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|
2250 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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|
2251 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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|
2252 // the beginning of CMTask::do_marking_step() for those conditions - |
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2253 // one of which is reaching the specified time target.) It is only |
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|
2254 // when CMTask::do_marking_step() returns without setting the |
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|
2255 // has_aborted() flag that the marking step has completed. |
2174
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|
2256 do { |
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|
2257 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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|
2258 _task->do_marking_step(mark_step_duration_ms, |
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|
2259 false /* do_termination */, |
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|
2260 _is_serial); |
2174
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2261 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2262 _ref_counter = _ref_counter_limit; |
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|
2263 } |
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2264 } else { |
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2265 if (_cm->verbose_high()) { |
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2266 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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2267 } |
2174
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|
2268 } |
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|
2269 } |
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|
2270 }; |
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|
2271 |
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2272 // 'Drain' oop closure used by both serial and parallel reference processing. |
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|
2273 // Uses the CMTask associated with a given worker thread (for serial |
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|
2274 // reference processing the CMtask for worker 0 is used). Calls the |
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|
2275 // do_marking_step routine, with an unbelievably large timeout value, |
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|
2276 // to drain the marking data structures of the remaining entries |
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|
2277 // added by the 'keep alive' oop closure above. |
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|
2278 |
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|
2279 class G1CMDrainMarkingStackClosure: public VoidClosure { |
2174
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|
2280 ConcurrentMark* _cm; |
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|
2281 CMTask* _task; |
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2282 bool _is_serial; |
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2283 public: |
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2284 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2285 _cm(cm), _task(task), _is_serial(is_serial) { |
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2286 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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2287 } |
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2288 |
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2289 void do_void() { |
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2290 do { |
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2291 if (_cm->verbose_high()) { |
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2292 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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2293 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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2294 } |
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2295 |
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2296 // We call CMTask::do_marking_step() to completely drain the local |
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2297 // and global marking stacks of entries pushed by the 'keep alive' |
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2298 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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2299 // |
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2300 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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2301 // if there's nothing more to do (i.e. we'completely drained the |
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2302 // entries that were pushed as a a result of applying the 'keep alive' |
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2303 // closure to the entries on the discovered ref lists) or we overflow |
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2304 // the global marking stack. |
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2305 // |
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2306 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2307 // flag while there may still be some work to do. (See the comment at |
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2308 // the beginning of CMTask::do_marking_step() for those conditions - |
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2309 // one of which is reaching the specified time target.) It is only |
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2310 // when CMTask::do_marking_step() returns without setting the |
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2311 // has_aborted() flag that the marking step has completed. |
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2312 |
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2313 _task->do_marking_step(1000000000.0 /* something very large */, |
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2314 true /* do_termination */, |
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2315 _is_serial); |
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2316 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2317 } |
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2318 }; |
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2319 |
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2320 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2321 // reference processing at the end of G1 concurrent marking |
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2322 |
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2323 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2324 private: |
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2325 G1CollectedHeap* _g1h; |
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2326 ConcurrentMark* _cm; |
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2327 WorkGang* _workers; |
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2328 int _active_workers; |
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2329 |
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2330 public: |
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2331 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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2332 ConcurrentMark* cm, |
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2333 WorkGang* workers, |
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2334 int n_workers) : |
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2335 _g1h(g1h), _cm(cm), |
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2336 _workers(workers), _active_workers(n_workers) { } |
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2337 |
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2338 // Executes the given task using concurrent marking worker threads. |
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2339 virtual void execute(ProcessTask& task); |
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|
2340 virtual void execute(EnqueueTask& task); |
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2341 }; |
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2342 |
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2343 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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2344 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2345 ProcessTask& _proc_task; |
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2346 G1CollectedHeap* _g1h; |
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2347 ConcurrentMark* _cm; |
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|
2348 |
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|
2349 public: |
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2350 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
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2351 G1CollectedHeap* g1h, |
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2352 ConcurrentMark* cm) : |
2174
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2353 AbstractGangTask("Process reference objects in parallel"), |
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2354 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
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2355 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
2356 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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2357 } |
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2358 |
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2359 virtual void work(uint worker_id) { |
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2360 CMTask* task = _cm->task(worker_id); |
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2361 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2362 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
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2363 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
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2364 |
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2365 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2366 } |
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|
2367 }; |
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|
2368 |
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2369 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2370 assert(_workers != NULL, "Need parallel worker threads."); |
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2371 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2372 |
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2373 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
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2374 |
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2375 // We need to reset the concurrency level before each |
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2376 // proxy task execution, so that the termination protocol |
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2377 // and overflow handling in CMTask::do_marking_step() knows |
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2378 // how many workers to wait for. |
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2379 _cm->set_concurrency(_active_workers); |
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2380 _g1h->set_par_threads(_active_workers); |
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2381 _workers->run_task(&proc_task_proxy); |
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2382 _g1h->set_par_threads(0); |
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2383 } |
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2384 |
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2385 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
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2386 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2387 EnqueueTask& _enq_task; |
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|
2388 |
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2389 public: |
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2390 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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2391 AbstractGangTask("Enqueue reference objects in parallel"), |
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2392 _enq_task(enq_task) { } |
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2393 |
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2394 virtual void work(uint worker_id) { |
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2395 _enq_task.work(worker_id); |
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2396 } |
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2397 }; |
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2398 |
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2399 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2400 assert(_workers != NULL, "Need parallel worker threads."); |
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2401 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2402 |
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2403 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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2404 |
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2405 // Not strictly necessary but... |
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2406 // |
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2407 // We need to reset the concurrency level before each |
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|
2408 // proxy task execution, so that the termination protocol |
e864cc14ca75
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|
2409 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
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parents:
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|
2410 // how many workers to wait for. |
e864cc14ca75
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|
2411 _cm->set_concurrency(_active_workers); |
2174
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|
2412 _g1h->set_par_threads(_active_workers); |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2413 _workers->run_task(&enq_task_proxy); |
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2414 _g1h->set_par_threads(0); |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
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|
2415 } |
234761c55641
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|
2416 |
342 | 2417 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
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|
2418 if (has_overflown()) { |
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|
2419 // Skip processing the discovered references if we have |
e864cc14ca75
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|
2420 // overflown the global marking stack. Reference objects |
e864cc14ca75
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|
2421 // only get discovered once so it is OK to not |
e864cc14ca75
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diff
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|
2422 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
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|
2423 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
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|
2424 // less reference objects are discovered. |
e864cc14ca75
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|
2425 return; |
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diff
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|
2426 } |
e864cc14ca75
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|
2427 |
342 | 2428 ResourceMark rm; |
2429 HandleMark hm; | |
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|
2430 |
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|
2431 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2432 |
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|
2433 // Is alive closure. |
1847b501ae74
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|
2434 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2435 |
1847b501ae74
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diff
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|
2436 // Inner scope to exclude the cleaning of the string and symbol |
1847b501ae74
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3914
diff
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|
2437 // tables from the displayed time. |
1847b501ae74
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|
2438 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
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|
2439 if (G1Log::finer()) { |
3975
1847b501ae74
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|
2440 gclog_or_tty->put(' '); |
1847b501ae74
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3914
diff
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|
2441 } |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
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|
2442 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
3975
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|
2443 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2444 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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|
2445 |
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|
2446 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
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|
2447 // about how reference processing currently works in G1. |
1847b501ae74
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|
2448 |
8014
f90b9bceb8e5
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|
2449 // Set the soft reference policy |
3975
1847b501ae74
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|
2450 rp->setup_policy(clear_all_soft_refs); |
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|
2451 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
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|
2452 |
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|
2453 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
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diff
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|
2454 // in serial reference processing. Note these closures are also |
fa08949fe0cb
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|
2455 // used for serially processing (by the the current thread) the |
fa08949fe0cb
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8744
diff
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|
2456 // JNI references during parallel reference processing. |
fa08949fe0cb
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diff
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|
2457 // |
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diff
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|
2458 // These closures do not need to synchronize with the worker |
fa08949fe0cb
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diff
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|
2459 // threads involved in parallel reference processing as these |
fa08949fe0cb
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diff
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|
2460 // instances are executed serially by the current thread (e.g. |
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|
2461 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
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diff
changeset
|
2462 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
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diff
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|
2463 // |
fa08949fe0cb
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diff
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|
2464 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
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parents:
8744
diff
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|
2465 // their own instances of these closures, which do their own |
fa08949fe0cb
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parents:
8744
diff
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|
2466 // synchronization among themselves. |
fa08949fe0cb
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diff
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|
2467 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
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|
2468 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
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diff
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|
2469 |
fa08949fe0cb
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diff
changeset
|
2470 // We need at least one active thread. If reference processing |
fa08949fe0cb
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diff
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|
2471 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
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diff
changeset
|
2472 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2473 // we utilize all the worker threads we can. |
fa08949fe0cb
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8744
diff
changeset
|
2474 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
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parents:
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diff
changeset
|
2475 uint active_workers = (processing_is_mt ? g1h->workers()->active_workers() : 1U); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2476 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
1847b501ae74
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|
2477 |
8787
fa08949fe0cb
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parents:
8744
diff
changeset
|
2478 // Parallel processing task executor. |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2479 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
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|
2480 g1h->workers(), active_workers); |
8787
fa08949fe0cb
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diff
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|
2481 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
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diff
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|
2482 |
8788
e864cc14ca75
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parents:
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diff
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|
2483 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
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8787
diff
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|
2484 // executing the remark task. |
e864cc14ca75
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diff
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|
2485 set_concurrency(active_workers); |
e864cc14ca75
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8787
diff
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|
2486 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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parents:
8008
diff
changeset
|
2487 // Set the degree of MT processing here. If the discovery was done MT, |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2488 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2489 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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parents:
8008
diff
changeset
|
2490 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2491 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2492 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2493 // Process the weak references. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2494 rp->process_discovered_references(&g1_is_alive, |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2495 &g1_keep_alive, |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2496 &g1_drain_mark_stack, |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2497 executor); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2498 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2499 // The do_oop work routines of the keep_alive and drain_marking_stack |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2500 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2501 // global marking stack. |
3975
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|
2502 |
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diff
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|
2503 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
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3914
diff
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|
2504 "mark stack should be empty (unless it overflowed)"); |
8787
fa08949fe0cb
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|
2505 |
3975
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diff
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|
2506 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2507 // This should have been done already when we tried to push an |
3975
1847b501ae74
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3914
diff
changeset
|
2508 // entry on to the global mark stack. But let's do it again. |
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diff
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|
2509 set_has_overflown(); |
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diff
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|
2510 } |
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diff
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|
2511 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2512 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2513 |
f90b9bceb8e5
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diff
changeset
|
2514 rp->enqueue_discovered_references(executor); |
3975
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|
2515 |
1847b501ae74
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diff
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|
2516 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2517 assert(!rp->discovery_enabled(), "Post condition"); |
2174
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|
2518 } |
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|
2519 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2520 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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parents:
1974
diff
changeset
|
2521 StringTable::unlink(&g1_is_alive); |
2177
3582bf76420e
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coleenp
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2175
diff
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|
2522 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
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coleenp
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2175
diff
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|
2523 SymbolTable::unlink(); |
342 | 2524 } |
2525 | |
2526 void ConcurrentMark::swapMarkBitMaps() { | |
2527 CMBitMapRO* temp = _prevMarkBitMap; | |
2528 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2529 _nextMarkBitMap = (CMBitMap*) temp; | |
2530 } | |
2531 | |
2532 class CMRemarkTask: public AbstractGangTask { | |
2533 private: | |
8787
fa08949fe0cb
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8744
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|
2534 ConcurrentMark* _cm; |
fa08949fe0cb
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8744
diff
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|
2535 bool _is_serial; |
342 | 2536 public: |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2537 void work(uint worker_id) { |
342 | 2538 // Since all available tasks are actually started, we should |
2539 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2540 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
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|
2541 CMTask* task = _cm->task(worker_id); |
342 | 2542 task->record_start_time(); |
2543 do { | |
2174
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|
2544 task->do_marking_step(1000000000.0 /* something very large */, |
8787
fa08949fe0cb
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8744
diff
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|
2545 true /* do_termination */, |
fa08949fe0cb
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diff
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|
2546 _is_serial); |
342 | 2547 } while (task->has_aborted() && !_cm->has_overflown()); |
2548 // If we overflow, then we do not want to restart. We instead | |
2549 // want to abort remark and do concurrent marking again. | |
2550 task->record_end_time(); | |
2551 } | |
2552 } | |
2553 | |
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2554 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
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2555 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2556 _cm->terminator()->reset_for_reuse(active_workers); |
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2557 } |
342 | 2558 }; |
2559 | |
2560 void ConcurrentMark::checkpointRootsFinalWork() { | |
2561 ResourceMark rm; | |
2562 HandleMark hm; | |
2563 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2564 | |
2565 g1h->ensure_parsability(false); | |
2566 | |
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2567 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2568 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2569 // this is remark, so we'll use up all active threads |
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2570 uint active_workers = g1h->workers()->active_workers(); |
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2571 if (active_workers == 0) { |
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2572 assert(active_workers > 0, "Should have been set earlier"); |
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2573 active_workers = (uint) ParallelGCThreads; |
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2574 g1h->workers()->set_active_workers(active_workers); |
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2575 } |
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2576 set_concurrency_and_phase(active_workers, false /* concurrent */); |
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2577 // Leave _parallel_marking_threads at it's |
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2578 // value originally calculated in the ConcurrentMark |
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|
2579 // constructor and pass values of the active workers |
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2580 // through the gang in the task. |
342 | 2581 |
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2582 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
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2583 // We will start all available threads, even if we decide that the |
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2584 // active_workers will be fewer. The extra ones will just bail out |
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2585 // immediately. |
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|
2586 g1h->set_par_threads(active_workers); |
342 | 2587 g1h->workers()->run_task(&remarkTask); |
2588 g1h->set_par_threads(0); | |
2589 } else { | |
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2590 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2591 uint active_workers = 1; |
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2592 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2593 |
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2594 // Note - if there's no work gang then the VMThread will be |
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|
2595 // the thread to execute the remark - serially. We have |
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|
2596 // to pass true for the is_serial parameter so that |
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|
2597 // CMTask::do_marking_step() doesn't enter the sync |
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|
2598 // barriers in the event of an overflow. Doing so will |
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|
2599 // cause an assert that the current thread is not a |
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|
2600 // concurrent GC thread. |
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|
2601 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2602 remarkTask.work(0); |
2603 } | |
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|
2604 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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|
2605 guarantee(has_overflown() || |
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|
2606 satb_mq_set.completed_buffers_num() == 0, |
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|
2607 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
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|
2608 BOOL_TO_STR(has_overflown()), |
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|
2609 satb_mq_set.completed_buffers_num())); |
342 | 2610 |
2611 print_stats(); | |
2612 } | |
2613 | |
1044 | 2614 #ifndef PRODUCT |
2615 | |
1388 | 2616 class PrintReachableOopClosure: public OopClosure { |
342 | 2617 private: |
2618 G1CollectedHeap* _g1h; | |
2619 outputStream* _out; | |
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|
2620 VerifyOption _vo; |
1388 | 2621 bool _all; |
342 | 2622 |
2623 public: | |
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2624 PrintReachableOopClosure(outputStream* out, |
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|
2625 VerifyOption vo, |
1388 | 2626 bool all) : |
1044 | 2627 _g1h(G1CollectedHeap::heap()), |
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|
2628 _out(out), _vo(vo), _all(all) { } |
342 | 2629 |
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|
2630 void do_oop(narrowOop* p) { do_oop_work(p); } |
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2631 void do_oop( oop* p) { do_oop_work(p); } |
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|
2632 |
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|
2633 template <class T> void do_oop_work(T* p) { |
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|
2634 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2635 const char* str = NULL; |
2636 const char* str2 = ""; | |
2637 | |
1388 | 2638 if (obj == NULL) { |
2639 str = ""; | |
2640 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2641 str = " O"; | |
2642 } else { | |
342 | 2643 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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|
2644 guarantee(hr != NULL, "invariant"); |
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2645 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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2646 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2647 |
2648 if (over_tams) { | |
1388 | 2649 str = " >"; |
2650 if (marked) { | |
342 | 2651 str2 = " AND MARKED"; |
1044 | 2652 } |
1388 | 2653 } else if (marked) { |
2654 str = " M"; | |
1044 | 2655 } else { |
1388 | 2656 str = " NOT"; |
1044 | 2657 } |
342 | 2658 } |
2659 | |
1388 | 2660 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2661 p, (void*) obj, str, str2); |
2662 } | |
2663 }; | |
2664 | |
1388 | 2665 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2666 private: |
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|
2667 G1CollectedHeap* _g1h; |
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|
2668 outputStream* _out; |
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|
2669 VerifyOption _vo; |
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|
2670 bool _all; |
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|
2671 HeapRegion* _hr; |
342 | 2672 |
2673 public: | |
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|
2674 PrintReachableObjectClosure(outputStream* out, |
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|
2675 VerifyOption vo, |
1388 | 2676 bool all, |
2677 HeapRegion* hr) : | |
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|
2678 _g1h(G1CollectedHeap::heap()), |
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|
2679 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2680 |
2681 void do_object(oop o) { | |
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2682 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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|
2683 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2684 bool print_it = _all || over_tams || marked; |
2685 | |
2686 if (print_it) { | |
2687 _out->print_cr(" "PTR_FORMAT"%s", | |
2688 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
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|
2689 PrintReachableOopClosure oopCl(_out, _vo, _all); |
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
2690 o->oop_iterate_no_header(&oopCl); |
1388 | 2691 } |
342 | 2692 } |
2693 }; | |
2694 | |
1388 | 2695 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2696 private: |
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|
2697 G1CollectedHeap* _g1h; |
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|
2698 outputStream* _out; |
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|
2699 VerifyOption _vo; |
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|
2700 bool _all; |
342 | 2701 |
2702 public: | |
2703 bool doHeapRegion(HeapRegion* hr) { | |
2704 HeapWord* b = hr->bottom(); | |
2705 HeapWord* e = hr->end(); | |
2706 HeapWord* t = hr->top(); | |
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|
2707 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2708 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2709 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2710 _out->cr(); |
2711 | |
2712 HeapWord* from = b; | |
2713 HeapWord* to = t; | |
2714 | |
2715 if (to > from) { | |
2716 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2717 _out->cr(); | |
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|
2718 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2719 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2720 _out->cr(); | |
2721 } | |
342 | 2722 |
2723 return false; | |
2724 } | |
2725 | |
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|
2726 PrintReachableRegionClosure(outputStream* out, |
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|
2727 VerifyOption vo, |
1388 | 2728 bool all) : |
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|
2729 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2730 }; |
2731 | |
1388 | 2732 void ConcurrentMark::print_reachable(const char* str, |
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|
2733 VerifyOption vo, |
1388 | 2734 bool all) { |
2735 gclog_or_tty->cr(); | |
2736 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2737 |
2738 if (G1PrintReachableBaseFile == NULL) { | |
2739 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2740 return; | |
2741 } | |
2742 | |
2743 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2744 (JVM_MAXPATHLEN - 1)) { | |
2745 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2746 return; | |
2747 } | |
2748 | |
2749 char file_name[JVM_MAXPATHLEN]; | |
2750 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2751 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2752 | |
2753 fileStream fout(file_name); | |
2754 if (!fout.is_open()) { | |
2755 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2756 return; | |
2757 } | |
2758 | |
2759 outputStream* out = &fout; | |
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2760 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2761 out->cr(); |
2762 | |
1388 | 2763 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2764 out->cr(); |
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|
2765 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2766 _g1h->heap_region_iterate(&rcl); |
1044 | 2767 out->cr(); |
2768 | |
2769 gclog_or_tty->print_cr(" done"); | |
1388 | 2770 gclog_or_tty->flush(); |
342 | 2771 } |
2772 | |
1044 | 2773 #endif // PRODUCT |
2774 | |
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|
2775 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2776 // Note we are overriding the read-only view of the prev map here, via |
2777 // the cast. | |
2778 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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|
2779 } |
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|
2780 |
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|
2781 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2782 _nextMarkBitMap->clearRange(mr); |
2783 } | |
2784 | |
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|
2785 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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|
2786 clearRangePrevBitmap(mr); |
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diff
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|
2787 clearRangeNextBitmap(mr); |
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|
2788 } |
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|
2789 |
342 | 2790 HeapRegion* |
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|
2791 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2792 // "checkpoint" the finger |
2793 HeapWord* finger = _finger; | |
2794 | |
2795 // _heap_end will not change underneath our feet; it only changes at | |
2796 // yield points. | |
2797 while (finger < _heap_end) { | |
1023
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2798 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2799 |
3771 | 2800 // Note on how this code handles humongous regions. In the |
2801 // normal case the finger will reach the start of a "starts | |
2802 // humongous" (SH) region. Its end will either be the end of the | |
2803 // last "continues humongous" (CH) region in the sequence, or the | |
2804 // standard end of the SH region (if the SH is the only region in | |
2805 // the sequence). That way claim_region() will skip over the CH | |
2806 // regions. However, there is a subtle race between a CM thread | |
2807 // executing this method and a mutator thread doing a humongous | |
2808 // object allocation. The two are not mutually exclusive as the CM | |
2809 // thread does not need to hold the Heap_lock when it gets | |
2810 // here. So there is a chance that claim_region() will come across | |
2811 // a free region that's in the progress of becoming a SH or a CH | |
2812 // region. In the former case, it will either | |
2813 // a) Miss the update to the region's end, in which case it will | |
2814 // visit every subsequent CH region, will find their bitmaps | |
2815 // empty, and do nothing, or | |
2816 // b) Will observe the update of the region's end (in which case | |
2817 // it will skip the subsequent CH regions). | |
2818 // If it comes across a region that suddenly becomes CH, the | |
2819 // scenario will be similar to b). So, the race between | |
2820 // claim_region() and a humongous object allocation might force us | |
2821 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2822 // iterations) but it should not introduce and correctness issues. | |
2823 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2824 HeapWord* bottom = curr_region->bottom(); |
2825 HeapWord* end = curr_region->end(); | |
2826 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2827 | |
3771 | 2828 if (verbose_low()) { |
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2829 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2830 "["PTR_FORMAT", "PTR_FORMAT"), " |
2831 "limit = "PTR_FORMAT, | |
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2832 worker_id, curr_region, bottom, end, limit); |
3771 | 2833 } |
2834 | |
2835 // Is the gap between reading the finger and doing the CAS too long? | |
2836 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2837 if (res == finger) { |
2838 // we succeeded | |
2839 | |
2840 // notice that _finger == end cannot be guaranteed here since, | |
2841 // someone else might have moved the finger even further | |
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2842 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2843 |
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|
2844 if (verbose_low()) { |
6862
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2845 gclog_or_tty->print_cr("[%u] we were successful with region = " |
8a5ea0a9ccc4
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2846 PTR_FORMAT, worker_id, curr_region); |
3776
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2847 } |
342 | 2848 |
2849 if (limit > bottom) { | |
3776
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2850 if (verbose_low()) { |
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|
2851 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2852 "returning it ", worker_id, curr_region); |
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2853 } |
342 | 2854 return curr_region; |
2855 } else { | |
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|
2856 assert(limit == bottom, |
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|
2857 "the region limit should be at bottom"); |
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|
2858 if (verbose_low()) { |
6862
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|
2859 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2860 "returning NULL", worker_id, curr_region); |
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|
2861 } |
342 | 2862 // we return NULL and the caller should try calling |
2863 // claim_region() again. | |
2864 return NULL; | |
2865 } | |
2866 } else { | |
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2867 assert(_finger > finger, "the finger should have moved forward"); |
3776
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|
2868 if (verbose_low()) { |
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|
2869 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 2870 "global finger = "PTR_FORMAT", " |
2871 "our finger = "PTR_FORMAT, | |
6862
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|
2872 worker_id, _finger, finger); |
3776
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|
2873 } |
342 | 2874 |
2875 // read it again | |
2876 finger = _finger; | |
2877 } | |
2878 } | |
2879 | |
2880 return NULL; | |
2881 } | |
2882 | |
4787
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2883 #ifndef PRODUCT |
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2884 enum VerifyNoCSetOopsPhase { |
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|
2885 VerifyNoCSetOopsStack, |
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|
2886 VerifyNoCSetOopsQueues, |
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2887 VerifyNoCSetOopsSATBCompleted, |
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2888 VerifyNoCSetOopsSATBThread |
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|
2889 }; |
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|
2890 |
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2891 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2892 private: |
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2893 G1CollectedHeap* _g1h; |
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2894 VerifyNoCSetOopsPhase _phase; |
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|
2895 int _info; |
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|
2896 |
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|
2897 const char* phase_str() { |
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|
2898 switch (_phase) { |
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2899 case VerifyNoCSetOopsStack: return "Stack"; |
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2900 case VerifyNoCSetOopsQueues: return "Queue"; |
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2901 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2902 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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|
2903 default: ShouldNotReachHere(); |
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|
2904 } |
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|
2905 return NULL; |
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|
2906 } |
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|
2907 |
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|
2908 void do_object_work(oop obj) { |
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|
2909 guarantee(!_g1h->obj_in_cs(obj), |
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|
2910 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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|
2911 (void*) obj, phase_str(), _info)); |
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|
2912 } |
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|
2913 |
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|
2914 public: |
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|
2915 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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|
2916 |
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|
2917 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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|
2918 _phase = phase; |
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|
2919 _info = info; |
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|
2920 } |
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|
2921 |
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|
2922 virtual void do_oop(oop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2923 oop obj = oopDesc::load_decode_heap_oop(p); |
2ace1c4ee8da
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|
2924 do_object_work(obj); |
2ace1c4ee8da
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|
2925 } |
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|
2926 |
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|
2927 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
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|
2928 // We should not come across narrow oops while scanning marking |
2ace1c4ee8da
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|
2929 // stacks and SATB buffers. |
2ace1c4ee8da
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|
2930 ShouldNotReachHere(); |
2ace1c4ee8da
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|
2931 } |
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|
2932 |
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|
2933 virtual void do_object(oop obj) { |
2ace1c4ee8da
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|
2934 do_object_work(obj); |
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|
2935 } |
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|
2936 }; |
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|
2937 |
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|
2938 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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|
2939 bool verify_enqueued_buffers, |
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|
2940 bool verify_thread_buffers, |
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|
2941 bool verify_fingers) { |
2ace1c4ee8da
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|
2942 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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|
2943 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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|
2944 return; |
342 | 2945 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
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|
2946 |
4787
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|
2947 VerifyNoCSetOopsClosure cl; |
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|
2948 |
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|
2949 if (verify_stacks) { |
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|
2950 // Verify entries on the global mark stack |
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|
2951 cl.set_phase(VerifyNoCSetOopsStack); |
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|
2952 _markStack.oops_do(&cl); |
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|
2953 |
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|
2954 // Verify entries on the task queues |
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|
2955 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
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|
2956 cl.set_phase(VerifyNoCSetOopsQueues, i); |
7397
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6865
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|
2957 CMTaskQueue* queue = _task_queues->queue(i); |
4787
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|
2958 queue->oops_do(&cl); |
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|
2959 } |
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|
2960 } |
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|
2961 |
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|
2962 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
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|
2963 |
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|
2964 // Verify entries on the enqueued SATB buffers |
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|
2965 if (verify_enqueued_buffers) { |
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|
2966 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
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|
2967 satb_qs.iterate_completed_buffers_read_only(&cl); |
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|
2968 } |
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|
2969 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
2970 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2971 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2972 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2973 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
|
2974 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2975 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2976 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2977 // Verify the global finger |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2978 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2979 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
|
2980 // 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
|
2981 // 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
|
2982 // 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
|
2983 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2984 // 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
|
2985 // 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
|
2986 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2987 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
|
2988 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2989 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
|
2990 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2991 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2992 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2993 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2994 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
|
2995 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
|
2996 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2997 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2998 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
|
2999 // 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
|
3000 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
|
3001 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3002 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3003 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
|
3004 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3005 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3006 } |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3007 } |
342 | 3008 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3009 #endif // PRODUCT |
342 | 3010 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3011 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3012 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3013 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3014 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3015 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3016 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3017 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3018 uint _max_worker_id; |
4836
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 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3021 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3022 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3023 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3024 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3025 _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
|
3026 _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
|
3027 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3028 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3029 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3030 // 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
|
3031 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3032 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3033 // "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
|
3034 // 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
|
3035 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3036 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3037 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3038 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3039 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3040 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3041 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3042 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3043 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3044 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
|
3045 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3046 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3047 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 start, limit, hr->top(), hr->end())); |
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 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3051 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3052 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 // 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
|
3054 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3055 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3056 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3057 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3058 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
|
3059 // '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
|
3060 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
|
3061 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3062 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
|
3063 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
|
3064 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
|
3065 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3066 // 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
|
3067 // 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
|
3068 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3069 // 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
|
3070 // 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
|
3071 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3072 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3073 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
|
3074 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3075 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3076 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3077 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3078 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3079 // 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
|
3080 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3081 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3082 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3083 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
|
3084 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
|
3085 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
|
3086 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3087 // 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
|
3088 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3089 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3090 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3091 // 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
|
3092 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3093 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
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|
3094 |
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|
3095 while (scan_idx < limit_idx) { |
d30fa85f9994
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changeset
|
3096 assert(task_card_bm->at(scan_idx) == true, "should be"); |
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|
3097 _cm_card_bm->set_bit(scan_idx); |
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changeset
|
3098 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
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|
3099 |
d30fa85f9994
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diff
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|
3100 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
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|
3101 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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parents:
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diff
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|
3102 // parameter. It does, however, have an early exit if |
4836
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|
3103 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
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diff
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|
3104 // passed in for left offset here. |
d30fa85f9994
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|
3105 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
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|
3106 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
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|
3107 } |
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diff
changeset
|
3108 } |
d30fa85f9994
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diff
changeset
|
3109 |
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diff
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|
3110 // Update the marked bytes for this region. |
d30fa85f9994
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|
3111 hr->add_to_marked_bytes(marked_bytes); |
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|
3112 |
d30fa85f9994
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diff
changeset
|
3113 // Next heap region |
d30fa85f9994
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|
3114 return false; |
d30fa85f9994
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diff
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|
3115 } |
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|
3116 }; |
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|
3117 |
d30fa85f9994
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|
3118 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
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|
3119 protected: |
d30fa85f9994
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|
3120 G1CollectedHeap* _g1h; |
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|
3121 ConcurrentMark* _cm; |
d30fa85f9994
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|
3122 BitMap* _cm_card_bm; |
6862
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|
3123 uint _max_worker_id; |
4836
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|
3124 int _active_workers; |
d30fa85f9994
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|
3125 |
d30fa85f9994
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|
3126 public: |
d30fa85f9994
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|
3127 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
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|
3128 ConcurrentMark* cm, |
d30fa85f9994
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|
3129 BitMap* cm_card_bm, |
6862
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|
3130 uint max_worker_id, |
4836
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|
3131 int n_workers) : |
d30fa85f9994
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diff
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|
3132 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
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|
3133 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
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|
3134 _max_worker_id(max_worker_id), |
4836
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|
3135 _active_workers(n_workers) { } |
d30fa85f9994
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|
3136 |
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|
3137 void work(uint worker_id) { |
6862
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|
3138 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
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|
3139 |
d30fa85f9994
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|
3140 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
3141 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
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|
3142 _active_workers, |
d30fa85f9994
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diff
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|
3143 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
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diff
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|
3144 } else { |
d30fa85f9994
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|
3145 _g1h->heap_region_iterate(&cl); |
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|
3146 } |
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diff
changeset
|
3147 } |
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diff
changeset
|
3148 }; |
d30fa85f9994
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diff
changeset
|
3149 |
d30fa85f9994
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diff
changeset
|
3150 |
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|
3151 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
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diff
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|
3152 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
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changeset
|
3153 _g1h->workers()->active_workers() : |
d30fa85f9994
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parents:
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diff
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|
3154 1); |
d30fa85f9994
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diff
changeset
|
3155 |
d30fa85f9994
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diff
changeset
|
3156 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
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|
3157 _max_worker_id, n_workers); |
4836
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|
3158 |
d30fa85f9994
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diff
changeset
|
3159 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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parents:
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diff
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|
3160 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
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diff
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|
3161 "sanity check"); |
d30fa85f9994
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diff
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|
3162 _g1h->set_par_threads(n_workers); |
d30fa85f9994
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diff
changeset
|
3163 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
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|
3164 _g1h->set_par_threads(0); |
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diff
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|
3165 |
d30fa85f9994
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diff
changeset
|
3166 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
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diff
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|
3167 "sanity check"); |
d30fa85f9994
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parents:
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diff
changeset
|
3168 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
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diff
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|
3169 } else { |
d30fa85f9994
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diff
changeset
|
3170 g1_par_agg_task.work(0); |
d30fa85f9994
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diff
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|
3171 } |
d30fa85f9994
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diff
changeset
|
3172 } |
d30fa85f9994
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diff
changeset
|
3173 |
d30fa85f9994
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diff
changeset
|
3174 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
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|
3175 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
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diff
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|
3176 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
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diff
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|
3177 // liveness count aggregation (during remark) and the |
d30fa85f9994
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diff
changeset
|
3178 // final counting task. |
d30fa85f9994
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diff
changeset
|
3179 _card_bm.clear(); |
d30fa85f9994
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diff
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|
3180 |
d30fa85f9994
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diff
changeset
|
3181 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
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diff
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|
3182 // of the final counting task. |
d30fa85f9994
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diff
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|
3183 _region_bm.clear(); |
d30fa85f9994
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4830
diff
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|
3184 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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diff
changeset
|
3185 uint max_regions = _g1h->max_regions(); |
6862
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|
3186 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
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diff
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|
3187 |
8a5ea0a9ccc4
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diff
changeset
|
3188 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
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|
3189 BitMap* task_card_bm = count_card_bitmap_for(i); |
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|
3190 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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|
3191 |
d30fa85f9994
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diff
changeset
|
3192 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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|
3193 assert(marked_bytes_array != NULL, "uninitialized"); |
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|
3194 |
6010
720b6a76dd9d
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|
3195 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
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|
3196 task_card_bm->clear(); |
d30fa85f9994
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|
3197 } |
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|
3198 } |
d30fa85f9994
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|
3199 |
342 | 3200 void ConcurrentMark::print_stats() { |
3201 if (verbose_stats()) { | |
3202 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3203 for (size_t i = 0; i < _active_tasks; ++i) { | |
3204 _tasks[i]->print_stats(); | |
3205 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3206 } | |
3207 } | |
3208 } | |
3209 | |
3210 // abandon current marking iteration due to a Full GC | |
3211 void ConcurrentMark::abort() { | |
3212 // Clear all marks to force marking thread to do nothing | |
3213 _nextMarkBitMap->clearAll(); | |
4836
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|
3214 // Clear the liveness counting data |
d30fa85f9994
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|
3215 clear_all_count_data(); |
342 | 3216 // Empty mark stack |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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7397
diff
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|
3217 reset_marking_state(); |
6862
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|
3218 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3219 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
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johnc
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1833
diff
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|
3220 } |
342 | 3221 _has_aborted = true; |
3222 | |
3223 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3224 satb_mq_set.abandon_partial_marking(); | |
1317
d4197f8d516a
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tonyp
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1314
diff
changeset
|
3225 // This can be called either during or outside marking, we'll read |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
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diff
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|
3226 // the expected_active value from the SATB queue set. |
d4197f8d516a
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tonyp
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diff
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|
3227 satb_mq_set.set_active_all_threads( |
d4197f8d516a
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1314
diff
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|
3228 false, /* new active value */ |
d4197f8d516a
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1314
diff
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|
3229 satb_mq_set.is_active() /* expected_active */); |
342 | 3230 } |
3231 | |
3232 static void print_ms_time_info(const char* prefix, const char* name, | |
3233 NumberSeq& ns) { | |
3234 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3235 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3236 if (ns.num() > 0) { | |
3237 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3238 prefix, ns.sd(), ns.maximum()); | |
3239 } | |
3240 } | |
3241 | |
3242 void ConcurrentMark::print_summary_info() { | |
3243 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3244 print_ms_time_info(" ", "init marks", _init_times); | |
3245 print_ms_time_info(" ", "remarks", _remark_times); | |
3246 { | |
3247 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3248 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3249 | |
3250 } | |
3251 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3252 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3253 _total_counting_time, | |
3254 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3255 (double)_cleanup_times.num() | |
3256 : 0.0)); | |
3257 if (G1ScrubRemSets) { | |
3258 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3259 _total_rs_scrub_time, | |
3260 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3261 (double)_cleanup_times.num() | |
3262 : 0.0)); | |
3263 } | |
3264 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3265 (_init_times.sum() + _remark_times.sum() + | |
3266 _cleanup_times.sum())/1000.0); | |
3267 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3268 "(%8.2f s marking).", |
342 | 3269 cmThread()->vtime_accum(), |
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3270 cmThread()->vtime_mark_accum()); |
342 | 3271 } |
3272 | |
1019 | 3273 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
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3274 if (use_parallel_marking_threads()) { |
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3275 _parallel_workers->print_worker_threads_on(st); |
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3276 } |
1019 | 3277 } |
3278 | |
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3279 void ConcurrentMark::print_on_error(outputStream* st) const { |
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3280 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
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3281 _prevMarkBitMap, _nextMarkBitMap); |
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3282 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
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3283 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
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3284 } |
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3285 |
342 | 3286 // We take a break if someone is trying to stop the world. |
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3287 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3288 if (should_yield()) { |
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3289 if (worker_id == 0) { |
342 | 3290 _g1h->g1_policy()->record_concurrent_pause(); |
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3291 } |
342 | 3292 cmThread()->yield(); |
3293 return true; | |
3294 } else { | |
3295 return false; | |
3296 } | |
3297 } | |
3298 | |
3299 bool ConcurrentMark::should_yield() { | |
3300 return cmThread()->should_yield(); | |
3301 } | |
3302 | |
3303 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3304 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3305 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3306 } | |
3307 | |
3308 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3309 void* last) { | |
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3310 return containing_card_is_marked(start) && |
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3311 containing_card_is_marked(last); |
342 | 3312 } |
3313 | |
3314 #ifndef PRODUCT | |
3315 // for debugging purposes | |
3316 void ConcurrentMark::print_finger() { | |
3317 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3318 _heap_start, _heap_end, _finger); | |
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3319 for (uint i = 0; i < _max_worker_id; ++i) { |
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3320 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
342 | 3321 } |
3322 gclog_or_tty->print_cr(""); | |
3323 } | |
3324 #endif | |
3325 | |
3771 | 3326 void CMTask::scan_object(oop obj) { |
3327 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3328 | |
3329 if (_cm->verbose_high()) { | |
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3330 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
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3331 _worker_id, (void*) obj); |
3771 | 3332 } |
3333 | |
3334 size_t obj_size = obj->size(); | |
3335 _words_scanned += obj_size; | |
3336 | |
3337 obj->oop_iterate(_cm_oop_closure); | |
3338 statsOnly( ++_objs_scanned ); | |
3339 check_limits(); | |
3340 } | |
3341 | |
342 | 3342 // Closure for iteration over bitmaps |
3343 class CMBitMapClosure : public BitMapClosure { | |
3344 private: | |
3345 // the bitmap that is being iterated over | |
3346 CMBitMap* _nextMarkBitMap; | |
3347 ConcurrentMark* _cm; | |
3348 CMTask* _task; | |
3349 | |
3350 public: | |
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3351 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3352 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3353 |
3354 bool do_bit(size_t offset) { | |
3355 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3356 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3357 assert( addr < _cm->finger(), "invariant"); |
342 | 3358 |
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3359 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3360 assert(addr >= _task->finger(), "invariant"); |
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3361 |
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3362 // We move that task's local finger along. |
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3363 _task->move_finger_to(addr); |
342 | 3364 |
3365 _task->scan_object(oop(addr)); | |
3366 // we only partially drain the local queue and global stack | |
3367 _task->drain_local_queue(true); | |
3368 _task->drain_global_stack(true); | |
3369 | |
3370 // if the has_aborted flag has been raised, we need to bail out of | |
3371 // the iteration | |
3372 return !_task->has_aborted(); | |
3373 } | |
3374 }; | |
3375 | |
3376 // Closure for iterating over objects, currently only used for | |
3377 // processing SATB buffers. | |
3378 class CMObjectClosure : public ObjectClosure { | |
3379 private: | |
3380 CMTask* _task; | |
3381 | |
3382 public: | |
3383 void do_object(oop obj) { | |
3384 _task->deal_with_reference(obj); | |
3385 } | |
3386 | |
3387 CMObjectClosure(CMTask* task) : _task(task) { } | |
3388 }; | |
3389 | |
3771 | 3390 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3391 ConcurrentMark* cm, | |
3392 CMTask* task) | |
3393 : _g1h(g1h), _cm(cm), _task(task) { | |
3394 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3395 | |
3396 if (G1UseConcMarkReferenceProcessing) { | |
3979
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3397 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3398 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3399 } |
3771 | 3400 } |
342 | 3401 |
3402 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3403 // Separated the asserts so that we know which one fires. |
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3404 assert(hr != NULL, |
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3405 "claim_region() should have filtered out continues humongous regions"); |
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3406 assert(!hr->continuesHumongous(), |
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3407 "claim_region() should have filtered out continues humongous regions"); |
342 | 3408 |
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3409 if (_cm->verbose_low()) { |
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3410 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3411 _worker_id, hr); |
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3412 } |
342 | 3413 |
3414 _curr_region = hr; | |
3415 _finger = hr->bottom(); | |
3416 update_region_limit(); | |
3417 } | |
3418 | |
3419 void CMTask::update_region_limit() { | |
3420 HeapRegion* hr = _curr_region; | |
3421 HeapWord* bottom = hr->bottom(); | |
3422 HeapWord* limit = hr->next_top_at_mark_start(); | |
3423 | |
3424 if (limit == bottom) { | |
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3425 if (_cm->verbose_low()) { |
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3426 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3427 "["PTR_FORMAT", "PTR_FORMAT")", |
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3428 _worker_id, bottom, limit); |
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3429 } |
342 | 3430 // The region was collected underneath our feet. |
3431 // We set the finger to bottom to ensure that the bitmap | |
3432 // iteration that will follow this will not do anything. | |
3433 // (this is not a condition that holds when we set the region up, | |
3434 // as the region is not supposed to be empty in the first place) | |
3435 _finger = bottom; | |
3436 } else if (limit >= _region_limit) { | |
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3437 assert(limit >= _finger, "peace of mind"); |
342 | 3438 } else { |
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3439 assert(limit < _region_limit, "only way to get here"); |
342 | 3440 // This can happen under some pretty unusual circumstances. An |
3441 // evacuation pause empties the region underneath our feet (NTAMS | |
3442 // at bottom). We then do some allocation in the region (NTAMS | |
3443 // stays at bottom), followed by the region being used as a GC | |
3444 // alloc region (NTAMS will move to top() and the objects | |
3445 // originally below it will be grayed). All objects now marked in | |
3446 // the region are explicitly grayed, if below the global finger, | |
3447 // and we do not need in fact to scan anything else. So, we simply | |
3448 // set _finger to be limit to ensure that the bitmap iteration | |
3449 // doesn't do anything. | |
3450 _finger = limit; | |
3451 } | |
3452 | |
3453 _region_limit = limit; | |
3454 } | |
3455 | |
3456 void CMTask::giveup_current_region() { | |
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3457 assert(_curr_region != NULL, "invariant"); |
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3458 if (_cm->verbose_low()) { |
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3459 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3460 _worker_id, _curr_region); |
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3461 } |
342 | 3462 clear_region_fields(); |
3463 } | |
3464 | |
3465 void CMTask::clear_region_fields() { | |
3466 // Values for these three fields that indicate that we're not | |
3467 // holding on to a region. | |
3468 _curr_region = NULL; | |
3469 _finger = NULL; | |
3470 _region_limit = NULL; | |
3471 } | |
3472 | |
3771 | 3473 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3474 if (cm_oop_closure == NULL) { | |
3475 assert(_cm_oop_closure != NULL, "invariant"); | |
3476 } else { | |
3477 assert(_cm_oop_closure == NULL, "invariant"); | |
3478 } | |
3479 _cm_oop_closure = cm_oop_closure; | |
3480 } | |
3481 | |
342 | 3482 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3483 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3484 |
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3485 if (_cm->verbose_low()) { |
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3486 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3487 } |
342 | 3488 |
3489 _nextMarkBitMap = nextMarkBitMap; | |
3490 clear_region_fields(); | |
3491 | |
3492 _calls = 0; | |
3493 _elapsed_time_ms = 0.0; | |
3494 _termination_time_ms = 0.0; | |
3495 _termination_start_time_ms = 0.0; | |
3496 | |
3497 #if _MARKING_STATS_ | |
3498 _local_pushes = 0; | |
3499 _local_pops = 0; | |
3500 _local_max_size = 0; | |
3501 _objs_scanned = 0; | |
3502 _global_pushes = 0; | |
3503 _global_pops = 0; | |
3504 _global_max_size = 0; | |
3505 _global_transfers_to = 0; | |
3506 _global_transfers_from = 0; | |
3507 _regions_claimed = 0; | |
3508 _objs_found_on_bitmap = 0; | |
3509 _satb_buffers_processed = 0; | |
3510 _steal_attempts = 0; | |
3511 _steals = 0; | |
3512 _aborted = 0; | |
3513 _aborted_overflow = 0; | |
3514 _aborted_cm_aborted = 0; | |
3515 _aborted_yield = 0; | |
3516 _aborted_timed_out = 0; | |
3517 _aborted_satb = 0; | |
3518 _aborted_termination = 0; | |
3519 #endif // _MARKING_STATS_ | |
3520 } | |
3521 | |
3522 bool CMTask::should_exit_termination() { | |
3523 regular_clock_call(); | |
3524 // This is called when we are in the termination protocol. We should | |
3525 // quit if, for some reason, this task wants to abort or the global | |
3526 // stack is not empty (this means that we can get work from it). | |
3527 return !_cm->mark_stack_empty() || has_aborted(); | |
3528 } | |
3529 | |
3530 void CMTask::reached_limit() { | |
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3531 assert(_words_scanned >= _words_scanned_limit || |
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3532 _refs_reached >= _refs_reached_limit , |
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3533 "shouldn't have been called otherwise"); |
342 | 3534 regular_clock_call(); |
3535 } | |
3536 | |
3537 void CMTask::regular_clock_call() { | |
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3538 if (has_aborted()) return; |
342 | 3539 |
3540 // First, we need to recalculate the words scanned and refs reached | |
3541 // limits for the next clock call. | |
3542 recalculate_limits(); | |
3543 | |
3544 // During the regular clock call we do the following | |
3545 | |
3546 // (1) If an overflow has been flagged, then we abort. | |
3547 if (_cm->has_overflown()) { | |
3548 set_has_aborted(); | |
3549 return; | |
3550 } | |
3551 | |
3552 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3553 // to check anything else. The other steps are only needed during | |
3554 // the concurrent marking phase. | |
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3555 if (!concurrent()) return; |
342 | 3556 |
3557 // (2) If marking has been aborted for Full GC, then we also abort. | |
3558 if (_cm->has_aborted()) { | |
3559 set_has_aborted(); | |
3560 statsOnly( ++_aborted_cm_aborted ); | |
3561 return; | |
3562 } | |
3563 | |
3564 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3565 | |
3566 // (3) If marking stats are enabled, then we update the step history. | |
3567 #if _MARKING_STATS_ | |
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3568 if (_words_scanned >= _words_scanned_limit) { |
342 | 3569 ++_clock_due_to_scanning; |
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3570 } |
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3571 if (_refs_reached >= _refs_reached_limit) { |
342 | 3572 ++_clock_due_to_marking; |
3776
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3573 } |
342 | 3574 |
3575 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3576 _interval_start_time_ms = curr_time_ms; | |
3577 _all_clock_intervals_ms.add(last_interval_ms); | |
3578 | |
3579 if (_cm->verbose_medium()) { | |
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3580 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
3776
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3581 "scanned = %d%s, refs reached = %d%s", |
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3582 _worker_id, last_interval_ms, |
3776
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3583 _words_scanned, |
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3584 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3585 _refs_reached, |
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3586 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3587 } |
3588 #endif // _MARKING_STATS_ | |
3589 | |
3590 // (4) We check whether we should yield. If we have to, then we abort. | |
3591 if (_cm->should_yield()) { | |
3592 // We should yield. To do this we abort the task. The caller is | |
3593 // responsible for yielding. | |
3594 set_has_aborted(); | |
3595 statsOnly( ++_aborted_yield ); | |
3596 return; | |
3597 } | |
3598 | |
3599 // (5) We check whether we've reached our time quota. If we have, | |
3600 // then we abort. | |
3601 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3602 if (elapsed_time_ms > _time_target_ms) { | |
3603 set_has_aborted(); | |
2174
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3604 _has_timed_out = true; |
342 | 3605 statsOnly( ++_aborted_timed_out ); |
3606 return; | |
3607 } | |
3608 | |
3609 // (6) Finally, we check whether there are enough completed STAB | |
3610 // buffers available for processing. If there are, we abort. | |
3611 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3612 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3776
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3613 if (_cm->verbose_low()) { |
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3614 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3615 _worker_id); |
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3616 } |
342 | 3617 // we do need to process SATB buffers, we'll abort and restart |
3618 // the marking task to do so | |
3619 set_has_aborted(); | |
3620 statsOnly( ++_aborted_satb ); | |
3621 return; | |
3622 } | |
3623 } | |
3624 | |
3625 void CMTask::recalculate_limits() { | |
3626 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3627 _words_scanned_limit = _real_words_scanned_limit; | |
3628 | |
3629 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3630 _refs_reached_limit = _real_refs_reached_limit; | |
3631 } | |
3632 | |
3633 void CMTask::decrease_limits() { | |
3634 // This is called when we believe that we're going to do an infrequent | |
3635 // operation which will increase the per byte scanned cost (i.e. move | |
3636 // entries to/from the global stack). It basically tries to decrease the | |
3637 // scanning limit so that the clock is called earlier. | |
3638 | |
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|
3639 if (_cm->verbose_medium()) { |
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3640 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
3776
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3641 } |
342 | 3642 |
3643 _words_scanned_limit = _real_words_scanned_limit - | |
3644 3 * words_scanned_period / 4; | |
3645 _refs_reached_limit = _real_refs_reached_limit - | |
3646 3 * refs_reached_period / 4; | |
3647 } | |
3648 | |
3649 void CMTask::move_entries_to_global_stack() { | |
3650 // local array where we'll store the entries that will be popped | |
3651 // from the local queue | |
3652 oop buffer[global_stack_transfer_size]; | |
3653 | |
3654 int n = 0; | |
3655 oop obj; | |
3656 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3657 buffer[n] = obj; | |
3658 ++n; | |
3659 } | |
3660 | |
3661 if (n > 0) { | |
3662 // we popped at least one entry from the local queue | |
3663 | |
3664 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3665 | |
3666 if (!_cm->mark_stack_push(buffer, n)) { | |
3776
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3667 if (_cm->verbose_low()) { |
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3668 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3669 _worker_id); |
3776
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|
3670 } |
342 | 3671 set_has_aborted(); |
3672 } else { | |
3673 // the transfer was successful | |
3674 | |
3776
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3675 if (_cm->verbose_medium()) { |
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3676 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3677 _worker_id, n); |
3776
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|
3678 } |
342 | 3679 statsOnly( int tmp_size = _cm->mark_stack_size(); |
3776
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3680 if (tmp_size > _global_max_size) { |
342 | 3681 _global_max_size = tmp_size; |
3776
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3682 } |
342 | 3683 _global_pushes += n ); |
3684 } | |
3685 } | |
3686 | |
3687 // this operation was quite expensive, so decrease the limits | |
3688 decrease_limits(); | |
3689 } | |
3690 | |
3691 void CMTask::get_entries_from_global_stack() { | |
3692 // local array where we'll store the entries that will be popped | |
3693 // from the global stack. | |
3694 oop buffer[global_stack_transfer_size]; | |
3695 int n; | |
3696 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
1023
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3697 assert(n <= global_stack_transfer_size, |
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3698 "we should not pop more than the given limit"); |
342 | 3699 if (n > 0) { |
3700 // yes, we did actually pop at least one entry | |
3701 | |
3702 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
3776
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3703 if (_cm->verbose_medium()) { |
6862
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3704 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3705 _worker_id, n); |
3776
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3706 } |
342 | 3707 for (int i = 0; i < n; ++i) { |
3708 bool success = _task_queue->push(buffer[i]); | |
3709 // We only call this when the local queue is empty or under a | |
3710 // given target limit. So, we do not expect this push to fail. | |
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3711 assert(success, "invariant"); |
342 | 3712 } |
3713 | |
3714 statsOnly( int tmp_size = _task_queue->size(); | |
3776
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3715 if (tmp_size > _local_max_size) { |
342 | 3716 _local_max_size = tmp_size; |
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3717 } |
342 | 3718 _local_pushes += n ); |
3719 } | |
3720 | |
3721 // this operation was quite expensive, so decrease the limits | |
3722 decrease_limits(); | |
3723 } | |
3724 | |
3725 void CMTask::drain_local_queue(bool partially) { | |
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3726 if (has_aborted()) return; |
342 | 3727 |
3728 // Decide what the target size is, depending whether we're going to | |
3729 // drain it partially (so that other tasks can steal if they run out | |
3730 // of things to do) or totally (at the very end). | |
3731 size_t target_size; | |
3776
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3732 if (partially) { |
342 | 3733 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
3776
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3734 } else { |
342 | 3735 target_size = 0; |
3776
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3736 } |
342 | 3737 |
3738 if (_task_queue->size() > target_size) { | |
3776
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|
3739 if (_cm->verbose_high()) { |
6862
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3740 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
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3741 _worker_id, target_size); |
3776
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|
3742 } |
342 | 3743 |
3744 oop obj; | |
3745 bool ret = _task_queue->pop_local(obj); | |
3746 while (ret) { | |
3747 statsOnly( ++_local_pops ); | |
3748 | |
3776
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|
3749 if (_cm->verbose_high()) { |
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|
3750 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
342 | 3751 (void*) obj); |
3776
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|
3752 } |
342 | 3753 |
1023
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changeset
|
3754 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3755 assert(!_g1h->is_on_master_free_list( |
2152 | 3756 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3757 |
3758 scan_object(obj); | |
3759 | |
3776
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|
3760 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3761 ret = false; |
3776
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|
3762 } else { |
342 | 3763 ret = _task_queue->pop_local(obj); |
3776
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3764 } |
342 | 3765 } |
3766 | |
3776
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|
3767 if (_cm->verbose_high()) { |
6862
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|
3768 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3769 _worker_id, _task_queue->size()); |
3776
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|
3770 } |
342 | 3771 } |
3772 } | |
3773 | |
3774 void CMTask::drain_global_stack(bool partially) { | |
3776
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|
3775 if (has_aborted()) return; |
342 | 3776 |
3777 // We have a policy to drain the local queue before we attempt to | |
3778 // drain the global stack. | |
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|
3779 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3780 |
3781 // Decide what the target size is, depending whether we're going to | |
3782 // drain it partially (so that other tasks can steal if they run out | |
3783 // of things to do) or totally (at the very end). Notice that, | |
3784 // because we move entries from the global stack in chunks or | |
3785 // because another task might be doing the same, we might in fact | |
3786 // drop below the target. But, this is not a problem. | |
3787 size_t target_size; | |
3776
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|
3788 if (partially) { |
342 | 3789 target_size = _cm->partial_mark_stack_size_target(); |
3776
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|
3790 } else { |
342 | 3791 target_size = 0; |
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3792 } |
342 | 3793 |
3794 if (_cm->mark_stack_size() > target_size) { | |
3776
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|
3795 if (_cm->verbose_low()) { |
6862
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|
3796 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
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3797 _worker_id, target_size); |
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|
3798 } |
342 | 3799 |
3800 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3801 get_entries_from_global_stack(); | |
3802 drain_local_queue(partially); | |
3803 } | |
3804 | |
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|
3805 if (_cm->verbose_low()) { |
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3806 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
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3807 _worker_id, _cm->mark_stack_size()); |
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3808 } |
342 | 3809 } |
3810 } | |
3811 | |
3812 // SATB Queue has several assumptions on whether to call the par or | |
3813 // non-par versions of the methods. this is why some of the code is | |
3814 // replicated. We should really get rid of the single-threaded version | |
3815 // of the code to simplify things. | |
3816 void CMTask::drain_satb_buffers() { | |
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3817 if (has_aborted()) return; |
342 | 3818 |
3819 // We set this so that the regular clock knows that we're in the | |
3820 // middle of draining buffers and doesn't set the abort flag when it | |
3821 // notices that SATB buffers are available for draining. It'd be | |
3822 // very counter productive if it did that. :-) | |
3823 _draining_satb_buffers = true; | |
3824 | |
3825 CMObjectClosure oc(this); | |
3826 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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|
3827 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3828 satb_mq_set.set_par_closure(_worker_id, &oc); |
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|
3829 } else { |
342 | 3830 satb_mq_set.set_closure(&oc); |
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|
3831 } |
342 | 3832 |
3833 // This keeps claiming and applying the closure to completed buffers | |
3834 // until we run out of buffers or we need to abort. | |
1833
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6984287: Regularize how GC parallel workers are specified.
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|
3835 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3836 while (!has_aborted() && |
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3837 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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|
3838 if (_cm->verbose_medium()) { |
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3839 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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|
3840 } |
342 | 3841 statsOnly( ++_satb_buffers_processed ); |
3842 regular_clock_call(); | |
3843 } | |
3844 } else { | |
3845 while (!has_aborted() && | |
3846 satb_mq_set.apply_closure_to_completed_buffer()) { | |
3776
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3847 if (_cm->verbose_medium()) { |
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3848 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3849 } |
342 | 3850 statsOnly( ++_satb_buffers_processed ); |
3851 regular_clock_call(); | |
3852 } | |
3853 } | |
3854 | |
3855 if (!concurrent() && !has_aborted()) { | |
3856 // We should only do this during remark. | |
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3857 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3858 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
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3859 } else { |
342 | 3860 satb_mq_set.iterate_closure_all_threads(); |
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3861 } |
342 | 3862 } |
3863 | |
3864 _draining_satb_buffers = false; | |
3865 | |
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3866 assert(has_aborted() || |
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3867 concurrent() || |
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3868 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3869 |
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3870 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3871 satb_mq_set.set_par_closure(_worker_id, NULL); |
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3872 } else { |
342 | 3873 satb_mq_set.set_closure(NULL); |
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3874 } |
342 | 3875 |
3876 // again, this was a potentially expensive operation, decrease the | |
3877 // limits to get the regular clock call early | |
3878 decrease_limits(); | |
3879 } | |
3880 | |
3881 void CMTask::print_stats() { | |
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3882 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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3883 _worker_id, _calls); |
342 | 3884 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
3885 _elapsed_time_ms, _termination_time_ms); | |
3886 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3887 _step_times_ms.num(), _step_times_ms.avg(), | |
3888 _step_times_ms.sd()); | |
3889 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3890 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3891 | |
3892 #if _MARKING_STATS_ | |
3893 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3894 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3895 _all_clock_intervals_ms.sd()); | |
3896 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3897 _all_clock_intervals_ms.maximum(), | |
3898 _all_clock_intervals_ms.sum()); | |
3899 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3900 _clock_due_to_scanning, _clock_due_to_marking); | |
3901 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3902 _objs_scanned, _objs_found_on_bitmap); | |
3903 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3904 _local_pushes, _local_pops, _local_max_size); | |
3905 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3906 _global_pushes, _global_pops, _global_max_size); | |
3907 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3908 _global_transfers_to,_global_transfers_from); | |
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3909 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3910 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3911 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3912 _steal_attempts, _steals); | |
3913 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3914 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3915 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3916 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3917 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3918 #endif // _MARKING_STATS_ | |
3919 } | |
3920 | |
3921 /***************************************************************************** | |
3922 | |
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3923 The do_marking_step(time_target_ms, ...) method is the building |
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3924 block of the parallel marking framework. It can be called in parallel |
342 | 3925 with other invocations of do_marking_step() on different tasks |
3926 (but only one per task, obviously) and concurrently with the | |
3927 mutator threads, or during remark, hence it eliminates the need | |
3928 for two versions of the code. When called during remark, it will | |
3929 pick up from where the task left off during the concurrent marking | |
3930 phase. Interestingly, tasks are also claimable during evacuation | |
3931 pauses too, since do_marking_step() ensures that it aborts before | |
3932 it needs to yield. | |
3933 | |
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3934 The data structures that it uses to do marking work are the |
342 | 3935 following: |
3936 | |
3937 (1) Marking Bitmap. If there are gray objects that appear only | |
3938 on the bitmap (this happens either when dealing with an overflow | |
3939 or when the initial marking phase has simply marked the roots | |
3940 and didn't push them on the stack), then tasks claim heap | |
3941 regions whose bitmap they then scan to find gray objects. A | |
3942 global finger indicates where the end of the last claimed region | |
3943 is. A local finger indicates how far into the region a task has | |
3944 scanned. The two fingers are used to determine how to gray an | |
3945 object (i.e. whether simply marking it is OK, as it will be | |
3946 visited by a task in the future, or whether it needs to be also | |
3947 pushed on a stack). | |
3948 | |
3949 (2) Local Queue. The local queue of the task which is accessed | |
3950 reasonably efficiently by the task. Other tasks can steal from | |
3951 it when they run out of work. Throughout the marking phase, a | |
3952 task attempts to keep its local queue short but not totally | |
3953 empty, so that entries are available for stealing by other | |
3954 tasks. Only when there is no more work, a task will totally | |
3955 drain its local queue. | |
3956 | |
3957 (3) Global Mark Stack. This handles local queue overflow. During | |
3958 marking only sets of entries are moved between it and the local | |
3959 queues, as access to it requires a mutex and more fine-grain | |
3960 interaction with it which might cause contention. If it | |
3961 overflows, then the marking phase should restart and iterate | |
3962 over the bitmap to identify gray objects. Throughout the marking | |
3963 phase, tasks attempt to keep the global mark stack at a small | |
3964 length but not totally empty, so that entries are available for | |
3965 popping by other tasks. Only when there is no more work, tasks | |
3966 will totally drain the global mark stack. | |
3967 | |
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3968 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 3969 made available. Buffers are regularly removed from this queue |
3970 and scanned for roots, so that the queue doesn't get too | |
3971 long. During remark, all completed buffers are processed, as | |
3972 well as the filled in parts of any uncompleted buffers. | |
3973 | |
3974 The do_marking_step() method tries to abort when the time target | |
3975 has been reached. There are a few other cases when the | |
3976 do_marking_step() method also aborts: | |
3977 | |
3978 (1) When the marking phase has been aborted (after a Full GC). | |
3979 | |
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3980 (2) When a global overflow (on the global stack) has been |
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3981 triggered. Before the task aborts, it will actually sync up with |
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3982 the other tasks to ensure that all the marking data structures |
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3983 (local queues, stacks, fingers etc.) are re-initialized so that |
5988
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3984 when do_marking_step() completes, the marking phase can |
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3985 immediately restart. |
342 | 3986 |
3987 (3) When enough completed SATB buffers are available. The | |
3988 do_marking_step() method only tries to drain SATB buffers right | |
3989 at the beginning. So, if enough buffers are available, the | |
3990 marking step aborts and the SATB buffers are processed at | |
3991 the beginning of the next invocation. | |
3992 | |
3993 (4) To yield. when we have to yield then we abort and yield | |
3994 right at the end of do_marking_step(). This saves us from a lot | |
3995 of hassle as, by yielding we might allow a Full GC. If this | |
3996 happens then objects will be compacted underneath our feet, the | |
3997 heap might shrink, etc. We save checking for this by just | |
3998 aborting and doing the yield right at the end. | |
3999 | |
4000 From the above it follows that the do_marking_step() method should | |
4001 be called in a loop (or, otherwise, regularly) until it completes. | |
4002 | |
4003 If a marking step completes without its has_aborted() flag being | |
4004 true, it means it has completed the current marking phase (and | |
4005 also all other marking tasks have done so and have all synced up). | |
4006 | |
4007 A method called regular_clock_call() is invoked "regularly" (in | |
4008 sub ms intervals) throughout marking. It is this clock method that | |
4009 checks all the abort conditions which were mentioned above and | |
4010 decides when the task should abort. A work-based scheme is used to | |
4011 trigger this clock method: when the number of object words the | |
4012 marking phase has scanned or the number of references the marking | |
4013 phase has visited reach a given limit. Additional invocations to | |
4014 the method clock have been planted in a few other strategic places | |
4015 too. The initial reason for the clock method was to avoid calling | |
4016 vtime too regularly, as it is quite expensive. So, once it was in | |
4017 place, it was natural to piggy-back all the other conditions on it | |
4018 too and not constantly check them throughout the code. | |
4019 | |
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4020 If do_termination is true then do_marking_step will enter its |
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4021 termination protocol. |
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4022 |
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4023 The value of is_serial must be true when do_marking_step is being |
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4024 called serially (i.e. by the VMThread) and do_marking_step should |
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4025 skip any synchronization in the termination and overflow code. |
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4026 Examples include the serial remark code and the serial reference |
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4027 processing closures. |
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4028 |
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4029 The value of is_serial must be false when do_marking_step is |
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4030 being called by any of the worker threads in a work gang. |
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4031 Examples include the concurrent marking code (CMMarkingTask), |
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4032 the MT remark code, and the MT reference processing closures. |
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4033 |
342 | 4034 *****************************************************************************/ |
4035 | |
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4036 void CMTask::do_marking_step(double time_target_ms, |
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4037 bool do_termination, |
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4038 bool is_serial) { |
1023
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4039 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4040 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4041 |
342 | 4042 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
1023
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4043 assert(_task_queues != NULL, "invariant"); |
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4044 assert(_task_queue != NULL, "invariant"); |
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4045 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4046 |
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4047 assert(!_claimed, |
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4048 "only one thread should claim this task at any one time"); |
342 | 4049 |
4050 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4051 // possible for two threads to set the _claimed flag at the same | |
4052 // time. But it is only for debugging purposes anyway and it will | |
4053 // catch most problems. | |
4054 _claimed = true; | |
4055 | |
4056 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4057 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4058 | |
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4059 // If do_stealing is true then do_marking_step will attempt to |
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4060 // steal work from the other CMTasks. It only makes sense to |
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4061 // enable stealing when the termination protocol is enabled |
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4062 // and do_marking_step() is not being called serially. |
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4063 bool do_stealing = do_termination && !is_serial; |
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4064 |
342 | 4065 double diff_prediction_ms = |
4066 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4067 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4068 | |
4069 // set up the variables that are used in the work-based scheme to | |
4070 // call the regular clock method | |
4071 _words_scanned = 0; | |
4072 _refs_reached = 0; | |
4073 recalculate_limits(); | |
4074 | |
4075 // clear all flags | |
4076 clear_has_aborted(); | |
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4077 _has_timed_out = false; |
342 | 4078 _draining_satb_buffers = false; |
4079 | |
4080 ++_calls; | |
4081 | |
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4082 if (_cm->verbose_low()) { |
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4083 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4084 "target = %1.2lfms >>>>>>>>>>", |
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4085 _worker_id, _calls, _time_target_ms); |
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4086 } |
342 | 4087 |
4088 // Set up the bitmap and oop closures. Anything that uses them is | |
4089 // eventually called from this method, so it is OK to allocate these | |
4090 // statically. | |
4091 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4092 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4093 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4094 |
4095 if (_cm->has_overflown()) { | |
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4096 // This can happen if the mark stack overflows during a GC pause |
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4097 // and this task, after a yield point, restarts. We have to abort |
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4098 // as we need to get into the overflow protocol which happens |
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4099 // right at the end of this task. |
342 | 4100 set_has_aborted(); |
4101 } | |
4102 | |
4103 // First drain any available SATB buffers. After this, we will not | |
4104 // look at SATB buffers before the next invocation of this method. | |
4105 // If enough completed SATB buffers are queued up, the regular clock | |
4106 // will abort this task so that it restarts. | |
4107 drain_satb_buffers(); | |
4108 // ...then partially drain the local queue and the global stack | |
4109 drain_local_queue(true); | |
4110 drain_global_stack(true); | |
4111 | |
4112 do { | |
4113 if (!has_aborted() && _curr_region != NULL) { | |
4114 // This means that we're already holding on to a region. | |
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4115 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4116 "should not be NULL either"); |
342 | 4117 |
4118 // We might have restarted this task after an evacuation pause | |
4119 // which might have evacuated the region we're holding on to | |
4120 // underneath our feet. Let's read its limit again to make sure | |
4121 // that we do not iterate over a region of the heap that | |
4122 // contains garbage (update_region_limit() will also move | |
4123 // _finger to the start of the region if it is found empty). | |
4124 update_region_limit(); | |
4125 // We will start from _finger not from the start of the region, | |
4126 // as we might be restarting this task after aborting half-way | |
4127 // through scanning this region. In this case, _finger points to | |
4128 // the address where we last found a marked object. If this is a | |
4129 // fresh region, _finger points to start(). | |
4130 MemRegion mr = MemRegion(_finger, _region_limit); | |
4131 | |
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4132 if (_cm->verbose_low()) { |
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4133 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4134 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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|
4135 "of region "HR_FORMAT, |
5e401ef52ec0
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|
4136 _worker_id, _finger, _region_limit, |
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4137 HR_FORMAT_PARAMS(_curr_region)); |
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4138 } |
342 | 4139 |
8039
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4140 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
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|
4141 "humongous regions should go around loop once only"); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4142 |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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4143 // Some special cases: |
5e401ef52ec0
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|
4144 // If the memory region is empty, we can just give up the region. |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4145 // If the current region is humongous then we only need to check |
5e401ef52ec0
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|
4146 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
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|
4147 // scan the object if it's live, and give up the region. |
5e401ef52ec0
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4148 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
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|
4149 // that is left. |
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7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
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4150 // If the iteration is successful, give up the region. |
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4151 if (mr.is_empty()) { |
5e401ef52ec0
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4152 giveup_current_region(); |
5e401ef52ec0
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|
4153 regular_clock_call(); |
5e401ef52ec0
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|
4154 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
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|
4155 if (_nextMarkBitMap->isMarked(mr.start())) { |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4156 // The object is marked - apply the closure |
5e401ef52ec0
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|
4157 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
5e401ef52ec0
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|
4158 bitmap_closure.do_bit(offset); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4159 } |
5e401ef52ec0
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|
4160 // Even if this task aborted while scanning the humongous object |
5e401ef52ec0
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4161 // we can (and should) give up the current region. |
5e401ef52ec0
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|
4162 giveup_current_region(); |
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|
4163 regular_clock_call(); |
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|
4164 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4165 giveup_current_region(); |
4166 regular_clock_call(); | |
4167 } else { | |
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4168 assert(has_aborted(), "currently the only way to do so"); |
342 | 4169 // The only way to abort the bitmap iteration is to return |
4170 // false from the do_bit() method. However, inside the | |
4171 // do_bit() method we move the _finger to point to the | |
4172 // object currently being looked at. So, if we bail out, we | |
4173 // have definitely set _finger to something non-null. | |
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4174 assert(_finger != NULL, "invariant"); |
342 | 4175 |
4176 // Region iteration was actually aborted. So now _finger | |
4177 // points to the address of the object we last scanned. If we | |
4178 // leave it there, when we restart this task, we will rescan | |
4179 // the object. It is easy to avoid this. We move the finger by | |
4180 // enough to point to the next possible object header (the | |
4181 // bitmap knows by how much we need to move it as it knows its | |
4182 // granularity). | |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4183 assert(_finger < _region_limit, "invariant"); |
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
tamao
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|
4184 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4185 // 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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|
4186 if (new_finger >= _region_limit) { |
5988
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|
4187 giveup_current_region(); |
1314
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|
4188 } else { |
5988
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|
4189 move_finger_to(new_finger); |
1314
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|
4190 } |
342 | 4191 } |
4192 } | |
4193 // At this point we have either completed iterating over the | |
4194 // region we were holding on to, or we have aborted. | |
4195 | |
4196 // We then partially drain the local queue and the global stack. | |
4197 // (Do we really need this?) | |
4198 drain_local_queue(true); | |
4199 drain_global_stack(true); | |
4200 | |
4201 // Read the note on the claim_region() method on why it might | |
4202 // return NULL with potentially more regions available for | |
4203 // claiming and why we have to check out_of_regions() to determine | |
4204 // whether we're done or not. | |
4205 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4206 // We are going to try to claim a new region. We should have | |
4207 // given up on the previous one. | |
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|
4208 // Separated the asserts so that we know which one fires. |
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|
4209 assert(_curr_region == NULL, "invariant"); |
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|
4210 assert(_finger == NULL, "invariant"); |
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|
4211 assert(_region_limit == NULL, "invariant"); |
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|
4212 if (_cm->verbose_low()) { |
6862
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|
4213 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
3776
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|
4214 } |
6862
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|
4215 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4216 if (claimed_region != NULL) { |
4217 // Yes, we managed to claim one | |
4218 statsOnly( ++_regions_claimed ); | |
4219 | |
3776
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|
4220 if (_cm->verbose_low()) { |
6862
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|
4221 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4222 "region "PTR_FORMAT, |
6862
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|
4223 _worker_id, claimed_region); |
3776
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|
4224 } |
342 | 4225 |
4226 setup_for_region(claimed_region); | |
1023
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|
4227 assert(_curr_region == claimed_region, "invariant"); |
342 | 4228 } |
4229 // It is important to call the regular clock here. It might take | |
4230 // a while to claim a region if, for example, we hit a large | |
4231 // block of empty regions. So we need to call the regular clock | |
4232 // method once round the loop to make sure it's called | |
4233 // frequently enough. | |
4234 regular_clock_call(); | |
4235 } | |
4236 | |
4237 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
4238 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4239 "at this point we should be out of regions"); |
342 | 4240 } |
4241 } while ( _curr_region != NULL && !has_aborted()); | |
4242 | |
4243 if (!has_aborted()) { | |
4244 // We cannot check whether the global stack is empty, since other | |
5988
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|
4245 // tasks might be pushing objects to it concurrently. |
1023
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|
4246 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4247 "at this point we should be out of regions"); |
342 | 4248 |
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|
4249 if (_cm->verbose_low()) { |
6862
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|
4250 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
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|
4251 } |
342 | 4252 |
4253 // Try to reduce the number of available SATB buffers so that | |
4254 // remark has less work to do. | |
4255 drain_satb_buffers(); | |
4256 } | |
4257 | |
4258 // Since we've done everything else, we can now totally drain the | |
4259 // local queue and global stack. | |
4260 drain_local_queue(false); | |
4261 drain_global_stack(false); | |
4262 | |
4263 // Attempt at work stealing from other task's queues. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4264 if (do_stealing && !has_aborted()) { |
342 | 4265 // We have not aborted. This means that we have finished all that |
4266 // we could. Let's try to do some stealing... | |
4267 | |
4268 // We cannot check whether the global stack is empty, since other | |
5988
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|
4269 // tasks might be pushing objects to it concurrently. |
1023
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|
4270 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
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|
4271 "only way to reach here"); |
342 | 4272 |
3776
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|
4273 if (_cm->verbose_low()) { |
6862
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|
4274 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
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|
4275 } |
342 | 4276 |
4277 while (!has_aborted()) { | |
4278 oop obj; | |
4279 statsOnly( ++_steal_attempts ); | |
4280 | |
6862
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|
4281 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
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|
4282 if (_cm->verbose_medium()) { |
6862
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|
4283 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
8a5ea0a9ccc4
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|
4284 _worker_id, (void*) obj); |
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|
4285 } |
342 | 4286 |
4287 statsOnly( ++_steals ); | |
4288 | |
1023
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|
4289 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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|
4290 "any stolen object should be marked"); |
342 | 4291 scan_object(obj); |
4292 | |
4293 // And since we're towards the end, let's totally drain the | |
4294 // local queue and global stack. | |
4295 drain_local_queue(false); | |
4296 drain_global_stack(false); | |
4297 } else { | |
4298 break; | |
4299 } | |
4300 } | |
4301 } | |
4302 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4303 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4304 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
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|
4305 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
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tonyp
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2436
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|
4306 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
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diff
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|
4307 _cm->set_has_overflown(); |
cd8e33b2a8ad
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tonyp
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|
4308 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
|
4309 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4310 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4311 |
342 | 4312 // We still haven't aborted. Now, let's try to get into the |
4313 // termination protocol. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4314 if (do_termination && !has_aborted()) { |
342 | 4315 // 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
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|
4316 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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|
4317 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4318 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4319 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4320 |
3776
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|
4321 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4322 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4323 } |
342 | 4324 |
4325 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
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|
4326 |
342 | 4327 // The CMTask class also extends the TerminatorTerminator class, |
4328 // hence its should_exit_termination() method will also decide | |
4329 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4330 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
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|
4331 _cm->terminator()->offer_termination(this)); |
342 | 4332 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4333 _termination_time_ms += | |
4334 termination_end_time_ms - _termination_start_time_ms; | |
4335 | |
4336 if (finished) { | |
4337 // We're all done. | |
4338 | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4339 if (_worker_id == 0) { |
342 | 4340 // let's allow task 0 to do this |
4341 if (concurrent()) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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|
4342 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4343 // we need to set this to false before the next |
4344 // safepoint. This way we ensure that the marking phase | |
4345 // doesn't observe any more heap expansions. | |
4346 _cm->clear_concurrent_marking_in_progress(); | |
4347 } | |
4348 } | |
4349 | |
4350 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
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diff
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|
4351 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4352 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4353 // which one. |
11d4857fe5e1
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|
4354 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4355 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
4356 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
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|
4357 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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|
4358 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4359 |
3776
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|
4360 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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|
4361 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
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|
4362 } |
342 | 4363 } else { |
4364 // Apparently there's more work to do. Let's abort this task. It | |
4365 // will restart it and we can hopefully find more things to do. | |
4366 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4367 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:
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diff
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|
4368 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
changeset
|
4369 _worker_id); |
3776
23d434c6290d
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|
4370 } |
342 | 4371 |
4372 set_has_aborted(); | |
4373 statsOnly( ++_aborted_termination ); | |
4374 } | |
4375 } | |
4376 | |
4377 // Mainly for debugging purposes to make sure that a pointer to the | |
4378 // closure which was statically allocated in this frame doesn't | |
4379 // escape it by accident. | |
3771 | 4380 set_cm_oop_closure(NULL); |
342 | 4381 double end_time_ms = os::elapsedVTime() * 1000.0; |
4382 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4383 // Update the step history. | |
4384 _step_times_ms.add(elapsed_time_ms); | |
4385 | |
4386 if (has_aborted()) { | |
4387 // The task was aborted for some reason. | |
4388 | |
4389 statsOnly( ++_aborted ); | |
4390 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4391 if (_has_timed_out) { |
342 | 4392 double diff_ms = elapsed_time_ms - _time_target_ms; |
4393 // Keep statistics of how well we did with respect to hitting | |
4394 // our target only if we actually timed out (if we aborted for | |
4395 // other reasons, then the results might get skewed). | |
4396 _marking_step_diffs_ms.add(diff_ms); | |
4397 } | |
4398 | |
4399 if (_cm->has_overflown()) { | |
4400 // This is the interesting one. We aborted because a global | |
4401 // overflow was raised. This means we have to restart the | |
4402 // marking phase and start iterating over regions. However, in | |
4403 // order to do this we have to make sure that all tasks stop | |
4404 // what they are doing and re-initialise in a safe manner. We | |
4405 // will achieve this with the use of two barrier sync points. | |
4406 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4407 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
changeset
|
4408 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4409 } |
342 | 4410 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4411 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4412 // We only need to enter the sync barrier if being called |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4413 // from a parallel context |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4414 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4415 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4416 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4417 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4418 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4419 // task 0 will clear the global data structures. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4420 } |
342 | 4421 |
4422 statsOnly( ++_aborted_overflow ); | |
4423 | |
4424 // We clear the local state of this task... | |
4425 clear_region_fields(); | |
4426 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4427 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4428 // ...and enter the second barrier. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4429 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4430 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4431 // At this point, if we're during the concurrent phase of |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4432 // marking, everything has been re-initialized and we're |
342 | 4433 // ready to restart. |
4434 } | |
4435 | |
4436 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4437 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4438 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4439 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4440 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4441 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
|
4442 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4443 } |
342 | 4444 } |
4445 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4446 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4447 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4448 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4449 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
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diff
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|
4450 } |
342 | 4451 } |
4452 | |
4453 _claimed = false; | |
4454 } | |
4455 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4456 CMTask::CMTask(uint worker_id, |
342 | 4457 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4458 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4459 BitMap* card_bm, |
342 | 4460 CMTaskQueue* task_queue, |
4461 CMTaskQueueSet* task_queues) | |
4462 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4463 _worker_id(worker_id), _cm(cm), |
342 | 4464 _claimed(false), |
4465 _nextMarkBitMap(NULL), _hash_seed(17), | |
4466 _task_queue(task_queue), | |
4467 _task_queues(task_queues), | |
3771 | 4468 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4469 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4470 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4471 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4472 guarantee(task_queues != NULL, "invariant"); |
342 | 4473 |
4474 statsOnly( _clock_due_to_scanning = 0; | |
4475 _clock_due_to_marking = 0 ); | |
4476 | |
4477 _marking_step_diffs_ms.add(0.5); | |
4478 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
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|
4479 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4480 // These are formatting macros that are used below to ensure |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4481 // consistent formatting. The *_H_* versions are used to format the |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4482 // 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
|
4483 // 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
|
4484 // 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
|
4485 // 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
|
4486 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4487 // 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
|
4488 // 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
|
4489 #define G1PPRL_LINE_PREFIX "###" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4490 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4491 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4492 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4493 #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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diff
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|
4494 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4495 #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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diff
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|
4496 #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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|
4497 |
371bbc844bf1
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diff
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|
4498 // 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
|
4499 #define G1PPRL_TYPE_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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|
4500 #define G1PPRL_TYPE_H_FORMAT " %4s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
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|
4501 #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:
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diff
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|
4502 #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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|
4503 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
4504 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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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|
4505 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4506 // For summary info |
371bbc844bf1
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changeset
|
4507 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4508 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4509 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4510 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4511 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4512 G1PrintRegionLivenessInfoClosure:: |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4513 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4514 : _out(out), |
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|
4515 _total_used_bytes(0), _total_capacity_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4516 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4517 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4518 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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|
4519 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
4520 MemRegion g1_committed = g1h->g1_committed(); |
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|
4521 MemRegion g1_reserved = g1h->g1_reserved(); |
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changeset
|
4522 double now = os::elapsedTime(); |
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changeset
|
4523 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4524 // Print the header of the output. |
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changeset
|
4525 _out->cr(); |
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|
4526 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4527 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4528 G1PPRL_SUM_ADDR_FORMAT("committed") |
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|
4529 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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|
4530 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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|
4531 g1_committed.start(), g1_committed.end(), |
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|
4532 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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changeset
|
4533 HeapRegion::GrainBytes); |
2435
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|
4534 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4535 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4536 G1PPRL_TYPE_H_FORMAT |
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|
4537 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4538 G1PPRL_BYTE_H_FORMAT |
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|
4539 G1PPRL_BYTE_H_FORMAT |
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|
4540 G1PPRL_BYTE_H_FORMAT |
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changeset
|
4541 G1PPRL_DOUBLE_H_FORMAT, |
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|
4542 "type", "address-range", |
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|
4543 "used", "prev-live", "next-live", "gc-eff"); |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4544 _out->print_cr(G1PPRL_LINE_PREFIX |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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diff
changeset
|
4545 G1PPRL_TYPE_H_FORMAT |
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parents:
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diff
changeset
|
4546 G1PPRL_ADDR_BASE_H_FORMAT |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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diff
changeset
|
4547 G1PPRL_BYTE_H_FORMAT |
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parents:
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diff
changeset
|
4548 G1PPRL_BYTE_H_FORMAT |
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parents:
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diff
changeset
|
4549 G1PPRL_BYTE_H_FORMAT |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
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changeset
|
4550 G1PPRL_DOUBLE_H_FORMAT, |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4551 "", "", |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4552 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
371bbc844bf1
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|
4553 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4554 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4555 // It takes as a parameter a reference to one of the _hum_* fields, it |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4556 // deduces the corresponding value for a region in a humongous region |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4557 // series (either the region size, or what's left if the _hum_* field |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4558 // is < the region size), and updates the _hum_* field accordingly. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4559 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4560 size_t bytes = 0; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4561 // The > 0 check is to deal with the prev and next live bytes which |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4562 // could be 0. |
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changeset
|
4563 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4564 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4565 *hum_bytes -= bytes; |
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|
4566 } |
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diff
changeset
|
4567 return bytes; |
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diff
changeset
|
4568 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4569 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4570 // It deduces the values for a region in a humongous region series |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4571 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4572 // that that _hum_* fields have already been set up from the "starts |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4573 // humongous" region and we visit the regions in address order. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4574 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4575 size_t* capacity_bytes, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4576 size_t* prev_live_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4577 size_t* next_live_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4578 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4579 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4580 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4581 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4582 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4583 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4584 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4585 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4586 const char* type = ""; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4587 HeapWord* bottom = r->bottom(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4588 HeapWord* end = r->end(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4589 size_t capacity_bytes = r->capacity(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4590 size_t used_bytes = r->used(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4591 size_t prev_live_bytes = r->live_bytes(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4592 size_t next_live_bytes = r->next_live_bytes(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4593 double gc_eff = r->gc_efficiency(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4594 if (r->used() == 0) { |
371bbc844bf1
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diff
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|
4595 type = "FREE"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4596 } else if (r->is_survivor()) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4597 type = "SURV"; |
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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|
4598 } else if (r->is_young()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4599 type = "EDEN"; |
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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|
4600 } else if (r->startsHumongous()) { |
371bbc844bf1
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diff
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|
4601 type = "HUMS"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4602 |
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diff
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|
4603 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4604 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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diff
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|
4605 "they should have been zeroed after the last time we used them"); |
371bbc844bf1
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diff
changeset
|
4606 // Set up the _hum_* fields. |
371bbc844bf1
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diff
changeset
|
4607 _hum_capacity_bytes = capacity_bytes; |
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|
4608 _hum_used_bytes = used_bytes; |
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changeset
|
4609 _hum_prev_live_bytes = prev_live_bytes; |
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|
4610 _hum_next_live_bytes = next_live_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4611 get_hum_bytes(&used_bytes, &capacity_bytes, |
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diff
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|
4612 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
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diff
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|
4613 end = bottom + HeapRegion::GrainWords; |
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diff
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|
4614 } else if (r->continuesHumongous()) { |
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diff
changeset
|
4615 type = "HUMC"; |
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diff
changeset
|
4616 get_hum_bytes(&used_bytes, &capacity_bytes, |
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diff
changeset
|
4617 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
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diff
changeset
|
4618 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4619 } else { |
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4620 type = "OLD"; |
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4621 } |
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4622 |
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4623 _total_used_bytes += used_bytes; |
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4624 _total_capacity_bytes += capacity_bytes; |
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4625 _total_prev_live_bytes += prev_live_bytes; |
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4626 _total_next_live_bytes += next_live_bytes; |
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4627 |
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4628 // Print a line for this particular region. |
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4629 _out->print_cr(G1PPRL_LINE_PREFIX |
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4630 G1PPRL_TYPE_FORMAT |
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4631 G1PPRL_ADDR_BASE_FORMAT |
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4632 G1PPRL_BYTE_FORMAT |
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4633 G1PPRL_BYTE_FORMAT |
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4634 G1PPRL_BYTE_FORMAT |
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4635 G1PPRL_DOUBLE_FORMAT, |
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4636 type, bottom, end, |
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4637 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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4638 |
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4639 return false; |
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4640 } |
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4641 |
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4642 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4643 // Print the footer of the output. |
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4644 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4645 _out->print_cr(G1PPRL_LINE_PREFIX |
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4646 " SUMMARY" |
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4647 G1PPRL_SUM_MB_FORMAT("capacity") |
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4648 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4649 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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4650 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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4651 bytes_to_mb(_total_capacity_bytes), |
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4652 bytes_to_mb(_total_used_bytes), |
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4653 perc(_total_used_bytes, _total_capacity_bytes), |
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4654 bytes_to_mb(_total_prev_live_bytes), |
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4655 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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4656 bytes_to_mb(_total_next_live_bytes), |
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4657 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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4658 _out->cr(); |
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4659 } |