Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
author | stefank |
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date | Mon, 07 Jul 2014 10:12:40 +0200 |
parents | 4dfab3faf5e7 |
children | f3aeae1f9fc5 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
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27 #include "code/codeCache.hpp" |
3771 | 28 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 29 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
30 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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32 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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33 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 34 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 35 #include "gc_implementation/g1/g1RemSet.hpp" |
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36 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 37 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
38 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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39 #include "gc_implementation/shared/vmGCOperations.hpp" |
10405 | 40 #include "gc_implementation/shared/gcTimer.hpp" |
41 #include "gc_implementation/shared/gcTrace.hpp" | |
42 #include "gc_implementation/shared/gcTraceTime.hpp" | |
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43 #include "memory/allocation.hpp" |
1972 | 44 #include "memory/genOopClosures.inline.hpp" |
45 #include "memory/referencePolicy.hpp" | |
46 #include "memory/resourceArea.hpp" | |
47 #include "oops/oop.inline.hpp" | |
48 #include "runtime/handles.inline.hpp" | |
49 #include "runtime/java.hpp" | |
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50 #include "runtime/prefetch.inline.hpp" |
6197 | 51 #include "services/memTracker.hpp" |
342 | 52 |
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53 // Concurrent marking bit map wrapper |
342 | 54 |
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55 CMBitMapRO::CMBitMapRO(int shifter) : |
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56 _bm(), |
342 | 57 _shifter(shifter) { |
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58 _bmStartWord = 0; |
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59 _bmWordSize = 0; |
342 | 60 } |
61 | |
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62 HeapWord* CMBitMapRO::getNextMarkedWordAddress(const HeapWord* addr, |
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63 const HeapWord* limit) const { |
342 | 64 // First we must round addr *up* to a possible object boundary. |
65 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
66 HeapWordSize << _shifter); | |
67 size_t addrOffset = heapWordToOffset(addr); | |
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68 if (limit == NULL) { |
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69 limit = _bmStartWord + _bmWordSize; |
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70 } |
342 | 71 size_t limitOffset = heapWordToOffset(limit); |
72 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
73 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
74 assert(nextAddr >= addr, "get_next_one postcondition"); | |
75 assert(nextAddr == limit || isMarked(nextAddr), | |
76 "get_next_one postcondition"); | |
77 return nextAddr; | |
78 } | |
79 | |
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80 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(const HeapWord* addr, |
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81 const HeapWord* limit) const { |
342 | 82 size_t addrOffset = heapWordToOffset(addr); |
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83 if (limit == NULL) { |
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84 limit = _bmStartWord + _bmWordSize; |
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85 } |
342 | 86 size_t limitOffset = heapWordToOffset(limit); |
87 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
88 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
89 assert(nextAddr >= addr, "get_next_one postcondition"); | |
90 assert(nextAddr == limit || !isMarked(nextAddr), | |
91 "get_next_one postcondition"); | |
92 return nextAddr; | |
93 } | |
94 | |
95 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
96 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
97 return (int) (diff >> _shifter); | |
98 } | |
99 | |
100 #ifndef PRODUCT | |
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101 bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
342 | 102 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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103 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 104 "size inconsistency"); |
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105 return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
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106 _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
342 | 107 } |
108 #endif | |
109 | |
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110 void CMBitMapRO::print_on_error(outputStream* st, const char* prefix) const { |
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111 _bm.print_on_error(st, prefix); |
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112 } |
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113 |
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114 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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115 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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116 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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117 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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118 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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119 if (!brs.is_reserved()) { |
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120 warning("ConcurrentMark marking bit map allocation failure"); |
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121 return false; |
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122 } |
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123 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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124 // For now we'll just commit all of the bit map up front. |
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125 // Later on we'll try to be more parsimonious with swap. |
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126 if (!_virtual_space.initialize(brs, brs.size())) { |
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127 warning("ConcurrentMark marking bit map backing store failure"); |
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128 return false; |
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129 } |
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130 assert(_virtual_space.committed_size() == brs.size(), |
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131 "didn't reserve backing store for all of concurrent marking bit map?"); |
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132 _bm.set_map((BitMap::bm_word_t*)_virtual_space.low()); |
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133 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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134 _bmWordSize, "inconsistency in bit map sizing"); |
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135 _bm.set_size(_bmWordSize >> _shifter); |
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136 return true; |
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137 } |
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138 |
342 | 139 void CMBitMap::clearAll() { |
140 _bm.clear(); | |
141 return; | |
142 } | |
143 | |
144 void CMBitMap::markRange(MemRegion mr) { | |
145 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
146 assert(!mr.is_empty(), "unexpected empty region"); | |
147 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
148 ((HeapWord *) mr.end())), | |
149 "markRange memory region end is not card aligned"); | |
150 // convert address range into offset range | |
151 _bm.at_put_range(heapWordToOffset(mr.start()), | |
152 heapWordToOffset(mr.end()), true); | |
153 } | |
154 | |
155 void CMBitMap::clearRange(MemRegion mr) { | |
156 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
157 assert(!mr.is_empty(), "unexpected empty region"); | |
158 // convert address range into offset range | |
159 _bm.at_put_range(heapWordToOffset(mr.start()), | |
160 heapWordToOffset(mr.end()), false); | |
161 } | |
162 | |
163 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
164 HeapWord* end_addr) { | |
165 HeapWord* start = getNextMarkedWordAddress(addr); | |
166 start = MIN2(start, end_addr); | |
167 HeapWord* end = getNextUnmarkedWordAddress(start); | |
168 end = MIN2(end, end_addr); | |
169 assert(start <= end, "Consistency check"); | |
170 MemRegion mr(start, end); | |
171 if (!mr.is_empty()) { | |
172 clearRange(mr); | |
173 } | |
174 return mr; | |
175 } | |
176 | |
177 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
178 _base(NULL), _cm(cm) | |
179 #ifdef ASSERT | |
180 , _drain_in_progress(false) | |
181 , _drain_in_progress_yields(false) | |
182 #endif | |
183 {} | |
184 | |
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185 bool CMMarkStack::allocate(size_t capacity) { |
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186 // allocate a stack of the requisite depth |
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187 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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188 if (!rs.is_reserved()) { |
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189 warning("ConcurrentMark MarkStack allocation failure"); |
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190 return false; |
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191 } |
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192 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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193 if (!_virtual_space.initialize(rs, rs.size())) { |
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194 warning("ConcurrentMark MarkStack backing store failure"); |
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195 // Release the virtual memory reserved for the marking stack |
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196 rs.release(); |
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197 return false; |
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198 } |
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199 assert(_virtual_space.committed_size() == rs.size(), |
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200 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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201 _base = (oop*) _virtual_space.low(); |
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202 setEmpty(); |
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203 _capacity = (jint) capacity; |
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204 _saved_index = -1; |
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205 _should_expand = false; |
342 | 206 NOT_PRODUCT(_max_depth = 0); |
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207 return true; |
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208 } |
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209 |
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210 void CMMarkStack::expand() { |
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211 // Called, during remark, if we've overflown the marking stack during marking. |
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212 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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213 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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214 // Clear expansion flag |
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215 _should_expand = false; |
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216 if (_capacity == (jint) MarkStackSizeMax) { |
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217 if (PrintGCDetails && Verbose) { |
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218 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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219 } |
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220 return; |
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221 } |
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222 // Double capacity if possible |
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223 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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224 // Do not give up existing stack until we have managed to |
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225 // get the double capacity that we desired. |
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226 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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227 sizeof(oop))); |
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228 if (rs.is_reserved()) { |
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229 // Release the backing store associated with old stack |
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230 _virtual_space.release(); |
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231 // Reinitialize virtual space for new stack |
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232 if (!_virtual_space.initialize(rs, rs.size())) { |
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233 fatal("Not enough swap for expanded marking stack capacity"); |
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234 } |
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235 _base = (oop*)(_virtual_space.low()); |
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236 _index = 0; |
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237 _capacity = new_capacity; |
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238 } else { |
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239 if (PrintGCDetails && Verbose) { |
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240 // Failed to double capacity, continue; |
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241 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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242 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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243 _capacity / K, new_capacity / K); |
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244 } |
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245 } |
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246 } |
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247 |
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248 void CMMarkStack::set_should_expand() { |
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249 // If we're resetting the marking state because of an |
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250 // marking stack overflow, record that we should, if |
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251 // possible, expand the stack. |
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252 _should_expand = _cm->has_overflown(); |
342 | 253 } |
254 | |
255 CMMarkStack::~CMMarkStack() { | |
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256 if (_base != NULL) { |
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257 _base = NULL; |
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258 _virtual_space.release(); |
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259 } |
342 | 260 } |
261 | |
262 void CMMarkStack::par_push(oop ptr) { | |
263 while (true) { | |
264 if (isFull()) { | |
265 _overflow = true; | |
266 return; | |
267 } | |
268 // Otherwise... | |
269 jint index = _index; | |
270 jint next_index = index+1; | |
271 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
272 if (res == index) { | |
273 _base[index] = ptr; | |
274 // Note that we don't maintain this atomically. We could, but it | |
275 // doesn't seem necessary. | |
276 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
277 return; | |
278 } | |
279 // Otherwise, we need to try again. | |
280 } | |
281 } | |
282 | |
283 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
284 while (true) { | |
285 if (isFull()) { | |
286 _overflow = true; | |
287 return; | |
288 } | |
289 // Otherwise... | |
290 jint index = _index; | |
291 jint next_index = index + n; | |
292 if (next_index > _capacity) { | |
293 _overflow = true; | |
294 return; | |
295 } | |
296 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
297 if (res == index) { | |
298 for (int i = 0; i < n; i++) { | |
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299 int ind = index + i; |
342 | 300 assert(ind < _capacity, "By overflow test above."); |
301 _base[ind] = ptr_arr[i]; | |
302 } | |
303 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
304 return; | |
305 } | |
306 // Otherwise, we need to try again. | |
307 } | |
308 } | |
309 | |
310 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
311 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
312 jint start = _index; | |
313 jint next_index = start + n; | |
314 if (next_index > _capacity) { | |
315 _overflow = true; | |
316 return; | |
317 } | |
318 // Otherwise. | |
319 _index = next_index; | |
320 for (int i = 0; i < n; i++) { | |
321 int ind = start + i; | |
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322 assert(ind < _capacity, "By overflow test above."); |
342 | 323 _base[ind] = ptr_arr[i]; |
324 } | |
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325 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 326 } |
327 | |
328 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
329 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
330 jint index = _index; | |
331 if (index == 0) { | |
332 *n = 0; | |
333 return false; | |
334 } else { | |
335 int k = MIN2(max, index); | |
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336 jint new_ind = index - k; |
342 | 337 for (int j = 0; j < k; j++) { |
338 ptr_arr[j] = _base[new_ind + j]; | |
339 } | |
340 _index = new_ind; | |
341 *n = k; | |
342 return true; | |
343 } | |
344 } | |
345 | |
346 template<class OopClosureClass> | |
347 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
348 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
349 || SafepointSynchronize::is_at_safepoint(), | |
350 "Drain recursion must be yield-safe."); | |
351 bool res = true; | |
352 debug_only(_drain_in_progress = true); | |
353 debug_only(_drain_in_progress_yields = yield_after); | |
354 while (!isEmpty()) { | |
355 oop newOop = pop(); | |
356 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
357 assert(newOop->is_oop(), "Expected an oop"); | |
358 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
359 "only grey objects on this stack"); | |
360 newOop->oop_iterate(cl); | |
361 if (yield_after && _cm->do_yield_check()) { | |
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362 res = false; |
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363 break; |
342 | 364 } |
365 } | |
366 debug_only(_drain_in_progress = false); | |
367 return res; | |
368 } | |
369 | |
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370 void CMMarkStack::note_start_of_gc() { |
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371 assert(_saved_index == -1, |
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372 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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373 _saved_index = _index; |
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374 } |
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375 |
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376 void CMMarkStack::note_end_of_gc() { |
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377 // This is intentionally a guarantee, instead of an assert. If we |
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378 // accidentally add something to the mark stack during GC, it |
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379 // will be a correctness issue so it's better if we crash. we'll |
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380 // only check this once per GC anyway, so it won't be a performance |
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381 // issue in any way. |
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382 guarantee(_saved_index == _index, |
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383 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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384 _saved_index = -1; |
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385 } |
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386 |
342 | 387 void CMMarkStack::oops_do(OopClosure* f) { |
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388 assert(_saved_index == _index, |
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389 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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390 for (int i = 0; i < _index; i += 1) { |
342 | 391 f->do_oop(&_base[i]); |
392 } | |
393 } | |
394 | |
395 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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396 return _g1h->is_obj_ill(obj); |
342 | 397 } |
398 | |
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399 CMRootRegions::CMRootRegions() : |
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400 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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401 _should_abort(false), _next_survivor(NULL) { } |
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402 |
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403 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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404 _young_list = g1h->young_list(); |
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405 _cm = cm; |
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406 } |
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407 |
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408 void CMRootRegions::prepare_for_scan() { |
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409 assert(!scan_in_progress(), "pre-condition"); |
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410 |
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411 // Currently, only survivors can be root regions. |
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412 assert(_next_survivor == NULL, "pre-condition"); |
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413 _next_survivor = _young_list->first_survivor_region(); |
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414 _scan_in_progress = (_next_survivor != NULL); |
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415 _should_abort = false; |
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416 } |
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417 |
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418 HeapRegion* CMRootRegions::claim_next() { |
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419 if (_should_abort) { |
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420 // If someone has set the should_abort flag, we return NULL to |
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421 // force the caller to bail out of their loop. |
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422 return NULL; |
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423 } |
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424 |
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425 // Currently, only survivors can be root regions. |
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426 HeapRegion* res = _next_survivor; |
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427 if (res != NULL) { |
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428 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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429 // Read it again in case it changed while we were waiting for the lock. |
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430 res = _next_survivor; |
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431 if (res != NULL) { |
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432 if (res == _young_list->last_survivor_region()) { |
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433 // We just claimed the last survivor so store NULL to indicate |
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434 // that we're done. |
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435 _next_survivor = NULL; |
eff609af17d7
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436 } else { |
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437 _next_survivor = res->get_next_young_region(); |
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438 } |
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439 } else { |
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440 // Someone else claimed the last survivor while we were trying |
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441 // to take the lock so nothing else to do. |
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442 } |
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443 } |
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444 assert(res == NULL || res->is_survivor(), "post-condition"); |
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445 |
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446 return res; |
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447 } |
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448 |
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449 void CMRootRegions::scan_finished() { |
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450 assert(scan_in_progress(), "pre-condition"); |
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451 |
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452 // Currently, only survivors can be root regions. |
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453 if (!_should_abort) { |
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454 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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455 } |
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456 _next_survivor = NULL; |
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457 |
eff609af17d7
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458 { |
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459 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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460 _scan_in_progress = false; |
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461 RootRegionScan_lock->notify_all(); |
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462 } |
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463 } |
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464 |
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465 bool CMRootRegions::wait_until_scan_finished() { |
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466 if (!scan_in_progress()) return false; |
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467 |
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468 { |
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469 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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470 while (scan_in_progress()) { |
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471 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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472 } |
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|
473 } |
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|
474 return true; |
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|
475 } |
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|
476 |
342 | 477 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
478 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
479 #endif // _MSC_VER | |
480 | |
4728
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7121618: Change type of number of GC workers to unsigned int.
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|
481 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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482 return MAX2((n_par_threads + 2) / 4, 1U); |
4095
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483 } |
bca17e38de00
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|
484 |
7397
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|
485 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
442f942757c0
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|
486 _g1h(g1h), |
12229
ff218fdb30ba
8021823: G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
tschatzl
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diff
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|
487 _markBitMap1(log2_intptr(MinObjAlignment)), |
ff218fdb30ba
8021823: G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
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488 _markBitMap2(log2_intptr(MinObjAlignment)), |
342 | 489 _parallel_marking_threads(0), |
4095
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490 _max_parallel_marking_threads(0), |
342 | 491 _sleep_factor(0.0), |
492 _marking_task_overhead(1.0), | |
493 _cleanup_sleep_factor(0.0), | |
494 _cleanup_task_overhead(1.0), | |
2152 | 495 _cleanup_list("Cleanup List"), |
7397
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496 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
442f942757c0
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497 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
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498 CardTableModRefBS::card_shift, |
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|
499 false /* in_resource_area*/), |
4836
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6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
500 |
342 | 501 _prevMarkBitMap(&_markBitMap1), |
502 _nextMarkBitMap(&_markBitMap2), | |
503 | |
504 _markStack(this), | |
505 // _finger set in set_non_marking_state | |
506 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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6812
diff
changeset
|
507 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 508 // _active_tasks set in set_non_marking_state |
509 // _tasks set inside the constructor | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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510 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
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|
511 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 512 |
513 _has_overflown(false), | |
514 _concurrent(false), | |
619
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
tonyp
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470
diff
changeset
|
515 _has_aborted(false), |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
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|
516 _aborted_gc_id(GCId::undefined()), |
619
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
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470
diff
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|
517 _restart_for_overflow(false), |
7ea5ca260b28
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470
diff
changeset
|
518 _concurrent_marking_in_progress(false), |
342 | 519 |
520 // _verbose_level set below | |
521 | |
522 _init_times(), | |
523 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
524 _cleanup_times(), | |
525 _total_counting_time(0.0), | |
526 _total_rs_scrub_time(0.0), | |
4836
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527 |
d30fa85f9994
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|
528 _parallel_workers(NULL), |
d30fa85f9994
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|
529 |
d30fa85f9994
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changeset
|
530 _count_card_bitmaps(NULL), |
7397
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8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
531 _count_marked_bytes(NULL), |
442f942757c0
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|
532 _completed_initialization(false) { |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
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|
533 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
534 if (verbose_level < no_verbose) { |
342 | 535 verbose_level = no_verbose; |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
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diff
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|
536 } |
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
537 if (verbose_level > high_verbose) { |
342 | 538 verbose_level = high_verbose; |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
539 } |
342 | 540 _verbose_level = verbose_level; |
541 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
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|
542 if (verbose_low()) { |
342 | 543 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
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|
544 "heap end = " INTPTR_FORMAT, p2i(_heap_start), p2i(_heap_end)); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
545 } |
342 | 546 |
7397
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8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
547 if (!_markBitMap1.allocate(heap_rs)) { |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
548 warning("Failed to allocate first CM bit map"); |
442f942757c0
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|
549 return; |
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|
550 } |
442f942757c0
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diff
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|
551 if (!_markBitMap2.allocate(heap_rs)) { |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
552 warning("Failed to allocate second CM bit map"); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
553 return; |
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|
554 } |
342 | 555 |
556 // Create & start a ConcurrentMark thread. | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
557 _cmThread = new ConcurrentMarkThread(this); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
558 assert(cmThread() != NULL, "CM Thread should have been created"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
559 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
13437
1de8e5356754
8029326: G1 does not check if threads gets created
ehelin
parents:
12316
diff
changeset
|
560 if (_cmThread->osthread() == NULL) { |
1de8e5356754
8029326: G1 does not check if threads gets created
ehelin
parents:
12316
diff
changeset
|
561 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
1de8e5356754
8029326: G1 does not check if threads gets created
ehelin
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|
562 } |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
563 |
342 | 564 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
7397
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|
565 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
442f942757c0
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|
566 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 567 |
568 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 569 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 570 |
4837
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571 _root_regions.init(_g1h, this); |
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|
572 |
1284 | 573 if (ConcGCThreads > ParallelGCThreads) { |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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diff
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|
574 warning("Can't have more ConcGCThreads (" UINTX_FORMAT ") " |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
575 "than ParallelGCThreads (" UINTX_FORMAT ").", |
7397
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8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
576 ConcGCThreads, ParallelGCThreads); |
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|
577 return; |
342 | 578 } |
579 if (ParallelGCThreads == 0) { | |
580 // if we are not running with any parallel GC threads we will not | |
581 // spawn any marking threads either | |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4093
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|
582 _parallel_marking_threads = 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
583 _max_parallel_marking_threads = 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
584 _sleep_factor = 0.0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4093
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changeset
|
585 _marking_task_overhead = 1.0; |
342 | 586 } else { |
8006
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
johnc
parents:
7450
diff
changeset
|
587 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
johnc
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diff
changeset
|
588 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 589 // if both are set |
590 _sleep_factor = 0.0; | |
591 _marking_task_overhead = 1.0; | |
751 | 592 } else if (G1MarkingOverheadPercent > 0) { |
8006
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
johnc
parents:
7450
diff
changeset
|
593 // We will calculate the number of parallel marking threads based |
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594 // on a target overhead with respect to the soft real-time goal |
751 | 595 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 596 double overall_cm_overhead = |
751 | 597 (double) MaxGCPauseMillis * marking_overhead / |
598 (double) GCPauseIntervalMillis; | |
342 | 599 double cpu_ratio = 1.0 / (double) os::processor_count(); |
600 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
601 double marking_task_overhead = | |
602 overall_cm_overhead / marking_thread_num * | |
603 (double) os::processor_count(); | |
604 double sleep_factor = | |
605 (1.0 - marking_task_overhead) / marking_task_overhead; | |
606 | |
8006
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607 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 608 _sleep_factor = sleep_factor; |
609 _marking_task_overhead = marking_task_overhead; | |
610 } else { | |
8006
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611 // Calculate the number of parallel marking threads by scaling |
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612 // the number of parallel GC threads. |
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613 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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614 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 615 _sleep_factor = 0.0; |
616 _marking_task_overhead = 1.0; | |
617 } | |
618 | |
8006
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619 assert(ConcGCThreads > 0, "Should have been set"); |
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620 _parallel_marking_threads = (uint) ConcGCThreads; |
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621 _max_parallel_marking_threads = _parallel_marking_threads; |
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622 |
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623 if (parallel_marking_threads() > 1) { |
342 | 624 _cleanup_task_overhead = 1.0; |
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625 } else { |
342 | 626 _cleanup_task_overhead = marking_task_overhead(); |
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627 } |
342 | 628 _cleanup_sleep_factor = |
629 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
630 | |
631 #if 0 | |
632 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
633 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
634 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
635 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
636 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
637 #endif | |
638 | |
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639 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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640 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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641 _max_parallel_marking_threads, false, true); |
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642 if (_parallel_workers == NULL) { |
342 | 643 vm_exit_during_initialization("Failed necessary allocation."); |
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644 } else { |
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645 _parallel_workers->initialize_workers(); |
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646 } |
342 | 647 } |
648 | |
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649 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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650 uintx mark_stack_size = |
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651 MIN2(MarkStackSizeMax, |
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652 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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653 // Verify that the calculated value for MarkStackSize is in range. |
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654 // It would be nice to use the private utility routine from Arguments. |
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655 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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656 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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657 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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658 mark_stack_size, (uintx) 1, MarkStackSizeMax); |
7397
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659 return; |
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660 } |
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661 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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662 } else { |
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663 // Verify MarkStackSize is in range. |
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664 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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665 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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666 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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667 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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668 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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669 MarkStackSize, (uintx) 1, MarkStackSizeMax); |
7397
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670 return; |
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671 } |
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672 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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673 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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674 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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675 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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676 MarkStackSize, MarkStackSizeMax); |
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677 return; |
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678 } |
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679 } |
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680 } |
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681 } |
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682 |
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683 if (!_markStack.allocate(MarkStackSize)) { |
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684 warning("Failed to allocate CM marking stack"); |
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685 return; |
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686 } |
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687 |
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688 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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689 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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690 |
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691 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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692 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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693 |
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694 BitMap::idx_t card_bm_size = _card_bm.size(); |
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695 |
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696 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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697 _active_tasks = _max_worker_id; |
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698 |
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699 size_t max_regions = (size_t) _g1h->max_regions(); |
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700 for (uint i = 0; i < _max_worker_id; ++i) { |
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701 CMTaskQueue* task_queue = new CMTaskQueue(); |
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702 task_queue->initialize(); |
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703 _task_queues->register_queue(i, task_queue); |
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704 |
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705 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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706 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
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707 |
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708 _tasks[i] = new CMTask(i, this, |
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709 _count_marked_bytes[i], |
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710 &_count_card_bitmaps[i], |
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711 task_queue, _task_queues); |
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712 |
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713 _accum_task_vtime[i] = 0.0; |
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714 } |
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715 |
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716 // Calculate the card number for the bottom of the heap. Used |
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717 // in biasing indexes into the accounting card bitmaps. |
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718 _heap_bottom_card_num = |
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719 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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720 CardTableModRefBS::card_shift); |
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721 |
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722 // Clear all the liveness counting data |
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723 clear_all_count_data(); |
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724 |
342 | 725 // so that the call below can read a sensible value |
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726 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 727 set_non_marking_state(); |
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728 _completed_initialization = true; |
342 | 729 } |
730 | |
731 void ConcurrentMark::update_g1_committed(bool force) { | |
732 // If concurrent marking is not in progress, then we do not need to | |
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733 // update _heap_end. |
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734 if (!concurrent_marking_in_progress() && !force) return; |
342 | 735 |
736 MemRegion committed = _g1h->g1_committed(); | |
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737 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 738 HeapWord* new_end = committed.end(); |
739 if (new_end > _heap_end) { | |
740 // The heap has been expanded. | |
741 | |
742 _heap_end = new_end; | |
743 } | |
744 // Notice that the heap can also shrink. However, this only happens | |
745 // during a Full GC (at least currently) and the entire marking | |
746 // phase will bail out and the task will not be restarted. So, let's | |
747 // do nothing. | |
748 } | |
749 | |
750 void ConcurrentMark::reset() { | |
751 // Starting values for these two. This should be called in a STW | |
752 // phase. CM will be notified of any future g1_committed expansions | |
753 // will be at the end of evacuation pauses, when tasks are | |
754 // inactive. | |
755 MemRegion committed = _g1h->g1_committed(); | |
756 _heap_start = committed.start(); | |
757 _heap_end = committed.end(); | |
758 | |
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759 // Separated the asserts so that we know which one fires. |
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760 assert(_heap_start != NULL, "heap bounds should look ok"); |
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761 assert(_heap_end != NULL, "heap bounds should look ok"); |
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762 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 763 |
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764 // Reset all the marking data structures and any necessary flags |
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765 reset_marking_state(); |
342 | 766 |
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767 if (verbose_low()) { |
342 | 768 gclog_or_tty->print_cr("[global] resetting"); |
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769 } |
342 | 770 |
771 // We do reset all of them, since different phases will use | |
772 // different number of active threads. So, it's easiest to have all | |
773 // of them ready. | |
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774 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 775 _tasks[i]->reset(_nextMarkBitMap); |
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776 } |
342 | 777 |
778 // we need this to make sure that the flag is on during the evac | |
779 // pause with initial mark piggy-backed | |
780 set_concurrent_marking_in_progress(); | |
781 } | |
782 | |
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783 |
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784 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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785 _markStack.set_should_expand(); |
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786 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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787 if (clear_overflow) { |
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788 clear_has_overflown(); |
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789 } else { |
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790 assert(has_overflown(), "pre-condition"); |
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791 } |
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792 _finger = _heap_start; |
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793 |
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794 for (uint i = 0; i < _max_worker_id; ++i) { |
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795 CMTaskQueue* queue = _task_queues->queue(i); |
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796 queue->set_empty(); |
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797 } |
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798 } |
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799 |
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800 void ConcurrentMark::set_concurrency(uint active_tasks) { |
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801 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 802 |
803 _active_tasks = active_tasks; | |
804 // Need to update the three data structures below according to the | |
805 // number of active threads for this phase. | |
806 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
807 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
808 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
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809 } |
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810 |
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811 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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812 set_concurrency(active_tasks); |
342 | 813 |
814 _concurrent = concurrent; | |
815 // We propagate this to all tasks, not just the active ones. | |
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816 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 817 _tasks[i]->set_concurrent(concurrent); |
818 | |
819 if (concurrent) { | |
820 set_concurrent_marking_in_progress(); | |
821 } else { | |
822 // We currently assume that the concurrent flag has been set to | |
823 // false before we start remark. At this point we should also be | |
824 // in a STW phase. | |
1023
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825 assert(!concurrent_marking_in_progress(), "invariant"); |
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826 assert(out_of_regions(), |
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827 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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828 p2i(_finger), p2i(_heap_end))); |
342 | 829 update_g1_committed(true); |
830 } | |
831 } | |
832 | |
833 void ConcurrentMark::set_non_marking_state() { | |
834 // We set the global marking state to some default values when we're | |
835 // not doing marking. | |
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836 reset_marking_state(); |
342 | 837 _active_tasks = 0; |
838 clear_concurrent_marking_in_progress(); | |
839 } | |
840 | |
841 ConcurrentMark::~ConcurrentMark() { | |
4735 | 842 // The ConcurrentMark instance is never freed. |
843 ShouldNotReachHere(); | |
342 | 844 } |
845 | |
846 void ConcurrentMark::clearNextBitmap() { | |
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847 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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848 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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849 |
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850 // Make sure that the concurrent mark thread looks to still be in |
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851 // the current cycle. |
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852 guarantee(cmThread()->during_cycle(), "invariant"); |
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853 |
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854 // We are finishing up the current cycle by clearing the next |
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855 // marking bitmap and getting it ready for the next cycle. During |
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856 // this time no other cycle can start. So, let's make sure that this |
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857 // is the case. |
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858 guarantee(!g1h->mark_in_progress(), "invariant"); |
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859 |
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860 // clear the mark bitmap (no grey objects to start with). |
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861 // We need to do this in chunks and offer to yield in between |
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862 // each chunk. |
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863 HeapWord* start = _nextMarkBitMap->startWord(); |
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864 HeapWord* end = _nextMarkBitMap->endWord(); |
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865 HeapWord* cur = start; |
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866 size_t chunkSize = M; |
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867 while (cur < end) { |
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868 HeapWord* next = cur + chunkSize; |
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869 if (next > end) { |
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870 next = end; |
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871 } |
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872 MemRegion mr(cur,next); |
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873 _nextMarkBitMap->clearRange(mr); |
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874 cur = next; |
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875 do_yield_check(); |
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876 |
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877 // Repeat the asserts from above. We'll do them as asserts here to |
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878 // minimize their overhead on the product. However, we'll have |
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879 // them as guarantees at the beginning / end of the bitmap |
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880 // clearing to get some checking in the product. |
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881 assert(cmThread()->during_cycle(), "invariant"); |
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882 assert(!g1h->mark_in_progress(), "invariant"); |
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883 } |
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884 |
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885 // Clear the liveness counting data |
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886 clear_all_count_data(); |
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887 |
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888 // Repeat the asserts from above. |
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889 guarantee(cmThread()->during_cycle(), "invariant"); |
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890 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 891 } |
892 | |
893 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
894 public: | |
895 bool doHeapRegion(HeapRegion* r) { | |
896 if (!r->continuesHumongous()) { | |
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897 r->note_start_of_marking(); |
342 | 898 } |
899 return false; | |
900 } | |
901 }; | |
902 | |
903 void ConcurrentMark::checkpointRootsInitialPre() { | |
904 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
905 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
906 | |
907 _has_aborted = false; | |
908 | |
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909 #ifndef PRODUCT |
1044 | 910 if (G1PrintReachableAtInitialMark) { |
1388 | 911 print_reachable("at-cycle-start", |
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912 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 913 } |
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914 #endif |
342 | 915 |
916 // Initialise marking structures. This has to be done in a STW phase. | |
917 reset(); | |
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918 |
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919 // For each region note start of marking. |
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920 NoteStartOfMarkHRClosure startcl; |
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921 g1h->heap_region_iterate(&startcl); |
342 | 922 } |
923 | |
924 | |
925 void ConcurrentMark::checkpointRootsInitialPost() { | |
926 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
927 | |
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928 // If we force an overflow during remark, the remark operation will |
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929 // actually abort and we'll restart concurrent marking. If we always |
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930 // force an oveflow during remark we'll never actually complete the |
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931 // marking phase. So, we initilize this here, at the start of the |
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932 // cycle, so that at the remaining overflow number will decrease at |
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933 // every remark and we'll eventually not need to cause one. |
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934 force_overflow_stw()->init(); |
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935 |
3979
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936 // Start Concurrent Marking weak-reference discovery. |
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937 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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938 // enable ("weak") refs discovery |
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939 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
457
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940 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 941 |
942 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
1317
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943 // This is the start of the marking cycle, we're expected all |
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944 // threads to have SATB queues with active set to false. |
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945 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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946 false /* expected_active */); |
342 | 947 |
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948 _root_regions.prepare_for_scan(); |
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949 |
342 | 950 // update_g1_committed() will be called at the end of an evac pause |
951 // when marking is on. So, it's also called at the end of the | |
952 // initial-mark pause to update the heap end, if the heap expands | |
953 // during it. No need to call it here. | |
954 } | |
955 | |
956 /* | |
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957 * Notice that in the next two methods, we actually leave the STS |
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958 * during the barrier sync and join it immediately afterwards. If we |
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959 * do not do this, the following deadlock can occur: one thread could |
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960 * be in the barrier sync code, waiting for the other thread to also |
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961 * sync up, whereas another one could be trying to yield, while also |
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962 * waiting for the other threads to sync up too. |
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963 * |
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964 * Note, however, that this code is also used during remark and in |
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965 * this case we should not attempt to leave / enter the STS, otherwise |
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966 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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967 * (product). So we should only leave / enter the STS if we are |
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968 * operating concurrently. |
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969 * |
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970 * Because the thread that does the sync barrier has left the STS, it |
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971 * is possible to be suspended for a Full GC or an evacuation pause |
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972 * could occur. This is actually safe, since the entering the sync |
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973 * barrier is one of the last things do_marking_step() does, and it |
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974 * doesn't manipulate any data structures afterwards. |
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975 */ |
342 | 976 |
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977 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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978 if (verbose_low()) { |
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979 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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980 } |
342 | 981 |
3316
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982 if (concurrent()) { |
20192 | 983 SuspendibleThreadSet::leave(); |
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984 } |
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985 |
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986 bool barrier_aborted = !_first_overflow_barrier_sync.enter(); |
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987 |
3316
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988 if (concurrent()) { |
20192 | 989 SuspendibleThreadSet::join(); |
3316
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990 } |
342 | 991 // at this point everyone should have synced up and not be doing any |
992 // more work | |
993 | |
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994 if (verbose_low()) { |
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995 if (barrier_aborted) { |
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996 gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id); |
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997 } else { |
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998 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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999 } |
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1000 } |
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1001 |
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1002 if (barrier_aborted) { |
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1003 // If the barrier aborted we ignore the overflow condition and |
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1004 // just abort the whole marking phase as quickly as possible. |
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1005 return; |
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1006 } |
342 | 1007 |
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1008 // If we're executing the concurrent phase of marking, reset the marking |
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1009 // state; otherwise the marking state is reset after reference processing, |
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1010 // during the remark pause. |
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1011 // If we reset here as a result of an overflow during the remark we will |
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1012 // see assertion failures from any subsequent set_concurrency_and_phase() |
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1013 // calls. |
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1014 if (concurrent()) { |
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1015 // let the task associated with with worker 0 do this |
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1016 if (worker_id == 0) { |
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1017 // task 0 is responsible for clearing the global data structures |
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1018 // We should be here because of an overflow. During STW we should |
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1019 // not clear the overflow flag since we rely on it being true when |
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1020 // we exit this method to abort the pause and restart concurent |
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1021 // marking. |
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1022 reset_marking_state(true /* clear_overflow */); |
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1023 force_overflow()->update(); |
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1024 |
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1025 if (G1Log::fine()) { |
20190
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1026 gclog_or_tty->gclog_stamp(concurrent_gc_id()); |
8788
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1027 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1028 } |
342 | 1029 } |
1030 } | |
1031 | |
1032 // after this, each task should reset its own data structures then | |
1033 // then go into the second barrier | |
1034 } | |
1035 | |
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1036 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1037 if (verbose_low()) { |
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1038 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1039 } |
342 | 1040 |
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1041 if (concurrent()) { |
20192 | 1042 SuspendibleThreadSet::leave(); |
3316
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1043 } |
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1044 |
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1045 bool barrier_aborted = !_second_overflow_barrier_sync.enter(); |
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1046 |
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1047 if (concurrent()) { |
20192 | 1048 SuspendibleThreadSet::join(); |
3316
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1049 } |
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1050 // at this point everything should be re-initialized and ready to go |
342 | 1051 |
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1052 if (verbose_low()) { |
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1053 if (barrier_aborted) { |
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1054 gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id); |
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1055 } else { |
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1056 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1057 } |
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1058 } |
342 | 1059 } |
1060 | |
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1061 #ifndef PRODUCT |
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1062 void ForceOverflowSettings::init() { |
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1063 _num_remaining = G1ConcMarkForceOverflow; |
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1064 _force = false; |
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1065 update(); |
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1066 } |
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1067 |
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1068 void ForceOverflowSettings::update() { |
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1069 if (_num_remaining > 0) { |
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1070 _num_remaining -= 1; |
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1071 _force = true; |
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1072 } else { |
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1073 _force = false; |
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1074 } |
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1075 } |
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1076 |
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1077 bool ForceOverflowSettings::should_force() { |
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1078 if (_force) { |
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1079 _force = false; |
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1080 return true; |
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1081 } else { |
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1082 return false; |
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1083 } |
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1084 } |
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1085 #endif // !PRODUCT |
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1086 |
342 | 1087 class CMConcurrentMarkingTask: public AbstractGangTask { |
1088 private: | |
1089 ConcurrentMark* _cm; | |
1090 ConcurrentMarkThread* _cmt; | |
1091 | |
1092 public: | |
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1093 void work(uint worker_id) { |
1023
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1094 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1095 "this should only be done by a conc GC thread"); |
1974
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1096 ResourceMark rm; |
342 | 1097 |
1098 double start_vtime = os::elapsedVTime(); | |
1099 | |
20192 | 1100 SuspendibleThreadSet::join(); |
342 | 1101 |
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1102 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1103 CMTask* the_task = _cm->task(worker_id); |
342 | 1104 the_task->record_start_time(); |
1105 if (!_cm->has_aborted()) { | |
1106 do { | |
1107 double start_vtime_sec = os::elapsedVTime(); | |
1108 double start_time_sec = os::elapsedTime(); | |
2174
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1109 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1110 |
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1111 the_task->do_marking_step(mark_step_duration_ms, |
8787
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1112 true /* do_termination */, |
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1113 false /* is_serial*/); |
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1114 |
342 | 1115 double end_time_sec = os::elapsedTime(); |
1116 double end_vtime_sec = os::elapsedVTime(); | |
1117 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1118 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1119 _cm->clear_has_overflown(); | |
1120 | |
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1121 bool ret = _cm->do_yield_check(worker_id); |
342 | 1122 |
1123 jlong sleep_time_ms; | |
1124 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1125 sleep_time_ms = | |
1126 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
20192 | 1127 SuspendibleThreadSet::leave(); |
342 | 1128 os::sleep(Thread::current(), sleep_time_ms, false); |
20192 | 1129 SuspendibleThreadSet::join(); |
342 | 1130 } |
1131 double end_time2_sec = os::elapsedTime(); | |
1132 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1133 | |
1134 #if 0 | |
1135 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1136 "overhead %1.4lf", | |
1137 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1138 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1139 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1140 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1141 #endif | |
1142 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1143 } | |
1144 the_task->record_end_time(); | |
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1145 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1146 |
20192 | 1147 SuspendibleThreadSet::leave(); |
342 | 1148 |
1149 double end_vtime = os::elapsedVTime(); | |
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1150 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1151 } |
1152 | |
1153 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1154 ConcurrentMarkThread* cmt) : | |
1155 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1156 | |
1157 ~CMConcurrentMarkingTask() { } | |
1158 }; | |
1159 | |
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1160 // Calculates the number of active workers for a concurrent |
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1161 // phase. |
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1162 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1163 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1164 uint n_conc_workers = 0; |
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1165 if (!UseDynamicNumberOfGCThreads || |
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1166 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1167 !ForceDynamicNumberOfGCThreads)) { |
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1168 n_conc_workers = max_parallel_marking_threads(); |
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1169 } else { |
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1170 n_conc_workers = |
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1171 AdaptiveSizePolicy::calc_default_active_workers( |
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1172 max_parallel_marking_threads(), |
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1173 1, /* Minimum workers */ |
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1174 parallel_marking_threads(), |
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1175 Threads::number_of_non_daemon_threads()); |
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1176 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1177 // that scaling has already gone into "_max_parallel_marking_threads". |
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1178 } |
4711 | 1179 assert(n_conc_workers > 0, "Always need at least 1"); |
1180 return n_conc_workers; | |
4095
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1181 } |
4711 | 1182 // If we are not running with any parallel GC threads we will not |
1183 // have spawned any marking threads either. Hence the number of | |
1184 // concurrent workers should be 0. | |
1185 return 0; | |
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1186 } |
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1187 |
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1188 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1189 // Currently, only survivors can be root regions. |
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1190 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1191 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1192 |
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1193 const uintx interval = PrefetchScanIntervalInBytes; |
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1194 HeapWord* curr = hr->bottom(); |
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1195 const HeapWord* end = hr->top(); |
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1196 while (curr < end) { |
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1197 Prefetch::read(curr, interval); |
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1198 oop obj = oop(curr); |
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1199 int size = obj->oop_iterate(&cl); |
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1200 assert(size == obj->size(), "sanity"); |
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1201 curr += size; |
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1202 } |
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1203 } |
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1204 |
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1205 class CMRootRegionScanTask : public AbstractGangTask { |
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1206 private: |
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1207 ConcurrentMark* _cm; |
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1208 |
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1209 public: |
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1210 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1211 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1212 |
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1213 void work(uint worker_id) { |
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1214 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1215 "this should only be done by a conc GC thread"); |
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1216 |
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1217 CMRootRegions* root_regions = _cm->root_regions(); |
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1218 HeapRegion* hr = root_regions->claim_next(); |
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1219 while (hr != NULL) { |
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1220 _cm->scanRootRegion(hr, worker_id); |
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1221 hr = root_regions->claim_next(); |
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1222 } |
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1223 } |
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1224 }; |
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1225 |
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1226 void ConcurrentMark::scanRootRegions() { |
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1227 // Start of concurrent marking. |
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1228 ClassLoaderDataGraph::clear_claimed_marks(); |
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1229 |
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1230 // scan_in_progress() will have been set to true only if there was |
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1231 // at least one root region to scan. So, if it's false, we |
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1232 // should not attempt to do any further work. |
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1233 if (root_regions()->scan_in_progress()) { |
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1234 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1235 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1236 "Maximum number of marking threads exceeded"); |
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1237 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1238 |
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1239 CMRootRegionScanTask task(this); |
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1240 if (use_parallel_marking_threads()) { |
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1241 _parallel_workers->set_active_workers((int) active_workers); |
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1242 _parallel_workers->run_task(&task); |
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1243 } else { |
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1244 task.work(0); |
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1245 } |
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1246 |
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1247 // It's possible that has_aborted() is true here without actually |
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1248 // aborting the survivor scan earlier. This is OK as it's |
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1249 // mainly used for sanity checking. |
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1250 root_regions()->scan_finished(); |
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1251 } |
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1252 } |
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1253 |
342 | 1254 void ConcurrentMark::markFromRoots() { |
1255 // we might be tempted to assert that: | |
1256 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1257 // "inconsistent argument?"); | |
1258 // However that wouldn't be right, because it's possible that | |
1259 // a safepoint is indeed in progress as a younger generation | |
1260 // stop-the-world GC happens even as we mark in this generation. | |
1261 | |
1262 _restart_for_overflow = false; | |
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1263 force_overflow_conc()->init(); |
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1264 |
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1265 // _g1h has _n_par_threads |
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1266 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1267 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1268 "Maximum number of marking threads exceeded"); |
4711 | 1269 |
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1270 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1271 |
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1272 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1273 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1274 |
1275 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1276 if (use_parallel_marking_threads()) { |
4711 | 1277 _parallel_workers->set_active_workers((int)active_workers); |
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1278 // Don't set _n_par_threads because it affects MT in process_roots() |
4711 | 1279 // and the decisions on that MT processing is made elsewhere. |
1280 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1281 _parallel_workers->run_task(&markingTask); |
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1282 } else { |
342 | 1283 markingTask.work(0); |
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1284 } |
342 | 1285 print_stats(); |
1286 } | |
1287 | |
1288 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1289 // world is stopped at this checkpoint | |
1290 assert(SafepointSynchronize::is_at_safepoint(), | |
1291 "world should be stopped"); | |
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1292 |
342 | 1293 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1294 | |
1295 // If a full collection has happened, we shouldn't do this. | |
1296 if (has_aborted()) { | |
1297 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1298 return; | |
1299 } | |
1300 | |
2125
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1301 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1302 |
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1303 if (VerifyDuringGC) { |
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1304 HandleMark hm; // handle scope |
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1305 Universe::heap()->prepare_for_verify(); |
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1306 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1307 " VerifyDuringGC:(before)"); |
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1308 } |
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1309 |
342 | 1310 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1311 g1p->record_concurrent_mark_remark_start(); | |
1312 | |
1313 double start = os::elapsedTime(); | |
1314 | |
1315 checkpointRootsFinalWork(); | |
1316 | |
1317 double mark_work_end = os::elapsedTime(); | |
1318 | |
1319 weakRefsWork(clear_all_soft_refs); | |
1320 | |
1321 if (has_overflown()) { | |
1322 // Oops. We overflowed. Restart concurrent marking. | |
1323 _restart_for_overflow = true; | |
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1324 if (G1TraceMarkStackOverflow) { |
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1325 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1326 } |
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1327 |
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1328 // Verify the heap w.r.t. the previous marking bitmap. |
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1329 if (VerifyDuringGC) { |
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1330 HandleMark hm; // handle scope |
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1331 Universe::heap()->prepare_for_verify(); |
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1332 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1333 " VerifyDuringGC:(overflow)"); |
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1334 } |
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1335 |
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1336 // Clear the marking state because we will be restarting |
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1337 // marking due to overflowing the global mark stack. |
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1338 reset_marking_state(); |
342 | 1339 } else { |
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1340 // Aggregate the per-task counting data that we have accumulated |
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1341 // while marking. |
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1342 aggregate_count_data(); |
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1343 |
2149 | 1344 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1345 // We're done with marking. |
1317
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1346 // This is the end of the marking cycle, we're expected all |
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1347 // threads to have SATB queues with active set to true. |
2149 | 1348 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1349 true /* expected_active */); | |
811 | 1350 |
1351 if (VerifyDuringGC) { | |
845
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1352 HandleMark hm; // handle scope |
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1353 Universe::heap()->prepare_for_verify(); |
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1354 Universe::verify(VerifyOption_G1UseNextMarking, |
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1355 " VerifyDuringGC:(after)"); |
811 | 1356 } |
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1357 assert(!restart_for_overflow(), "sanity"); |
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1358 // Completely reset the marking state since marking completed |
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1359 set_non_marking_state(); |
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1360 } |
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1361 |
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1362 // Expand the marking stack, if we have to and if we can. |
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1363 if (_markStack.should_expand()) { |
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1364 _markStack.expand(); |
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1365 } |
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1366 |
342 | 1367 // Statistics |
1368 double now = os::elapsedTime(); | |
1369 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1370 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1371 _remark_times.add((now - start) * 1000.0); | |
1372 | |
1373 g1p->record_concurrent_mark_remark_end(); | |
10405 | 1374 |
1375 G1CMIsAliveClosure is_alive(g1h); | |
1376 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
342 | 1377 } |
1378 | |
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1379 // Base class of the closures that finalize and verify the |
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1380 // liveness counting data. |
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1381 class CMCountDataClosureBase: public HeapRegionClosure { |
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1382 protected: |
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1383 G1CollectedHeap* _g1h; |
342 | 1384 ConcurrentMark* _cm; |
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1385 CardTableModRefBS* _ct_bs; |
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1386 |
342 | 1387 BitMap* _region_bm; |
1388 BitMap* _card_bm; | |
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1389 |
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1390 // Takes a region that's not empty (i.e., it has at least one |
829 | 1391 // live object in it and sets its corresponding bit on the region |
1392 // bitmap to 1. If the region is "starts humongous" it will also set | |
1393 // to 1 the bits on the region bitmap that correspond to its | |
1394 // associated "continues humongous" regions. | |
1395 void set_bit_for_region(HeapRegion* hr) { | |
1396 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1397 | |
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1398 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1399 if (!hr->startsHumongous()) { |
1400 // Normal (non-humongous) case: just set the bit. | |
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1401 _region_bm->par_at_put(index, true); |
829 | 1402 } else { |
1403 // Starts humongous case: calculate how many regions are part of | |
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1404 // this humongous region and then set the bit range. |
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1405 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1406 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1407 } |
1408 } | |
1409 | |
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1410 public: |
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1411 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1412 BitMap* region_bm, BitMap* card_bm): |
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1413 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1414 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1415 _region_bm(region_bm), _card_bm(card_bm) { } |
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1416 }; |
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1417 |
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1418 // Closure that calculates the # live objects per region. Used |
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1419 // for verification purposes during the cleanup pause. |
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1420 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1421 CMBitMapRO* _bm; |
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1422 size_t _region_marked_bytes; |
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1423 |
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1424 public: |
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1425 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1426 BitMap* region_bm, BitMap* card_bm) : |
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1427 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1428 _bm(bm), _region_marked_bytes(0) { } |
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1429 |
342 | 1430 bool doHeapRegion(HeapRegion* hr) { |
1431 | |
639 | 1432 if (hr->continuesHumongous()) { |
829 | 1433 // We will ignore these here and process them when their |
1434 // associated "starts humongous" region is processed (see | |
1435 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1436 // associated "starts humongous" region to have their bit set to | |
1437 // 1 since, due to the region chunking in the parallel region | |
1438 // iteration, a "continues humongous" region might be visited | |
1439 // before its associated "starts humongous". | |
639 | 1440 return false; |
1441 } | |
342 | 1442 |
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1443 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1444 HeapWord* start = hr->bottom(); |
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1445 |
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1446 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1447 err_msg("Preconditions not met - " |
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1448 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1449 p2i(start), p2i(ntams), p2i(hr->end()))); |
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1450 |
342 | 1451 // Find the first marked object at or after "start". |
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1452 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1453 |
342 | 1454 size_t marked_bytes = 0; |
1455 | |
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1456 while (start < ntams) { |
342 | 1457 oop obj = oop(start); |
1458 int obj_sz = obj->size(); | |
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1459 HeapWord* obj_end = start + obj_sz; |
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1460 |
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1461 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1462 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1463 |
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1464 // Note: if we're looking at the last region in heap - obj_end |
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1465 // could be actually just beyond the end of the heap; end_idx |
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1466 // will then correspond to a (non-existent) card that is also |
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1467 // just beyond the heap. |
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1468 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1469 // end of object is not card aligned - increment to cover |
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1470 // all the cards spanned by the object |
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1471 end_idx += 1; |
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1472 } |
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1473 |
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1474 // Set the bits in the card BM for the cards spanned by this object. |
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1475 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1476 |
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1477 // Add the size of this object to the number of marked bytes. |
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1478 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1479 |
342 | 1480 // Find the next marked object after this one. |
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1481 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1482 } |
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1483 |
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1484 // Mark the allocated-since-marking portion... |
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1485 HeapWord* top = hr->top(); |
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1486 if (ntams < top) { |
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1487 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1488 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1489 |
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1490 // Note: if we're looking at the last region in heap - top |
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1491 // could be actually just beyond the end of the heap; end_idx |
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1492 // will then correspond to a (non-existent) card that is also |
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1493 // just beyond the heap. |
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1494 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1495 // end of object is not card aligned - increment to cover |
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1496 // all the cards spanned by the object |
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1497 end_idx += 1; |
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1498 } |
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1499 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1500 |
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1501 // This definitely means the region has live objects. |
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1502 set_bit_for_region(hr); |
342 | 1503 } |
1504 | |
1505 // Update the live region bitmap. | |
1506 if (marked_bytes > 0) { | |
829 | 1507 set_bit_for_region(hr); |
342 | 1508 } |
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1509 |
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1510 // Set the marked bytes for the current region so that |
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1511 // it can be queried by a calling verificiation routine |
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1512 _region_marked_bytes = marked_bytes; |
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1513 |
342 | 1514 return false; |
1515 } | |
1516 | |
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1517 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1518 }; |
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1519 |
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1520 // Heap region closure used for verifying the counting data |
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1521 // that was accumulated concurrently and aggregated during |
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1522 // the remark pause. This closure is applied to the heap |
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1523 // regions during the STW cleanup pause. |
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1524 |
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1525 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1526 G1CollectedHeap* _g1h; |
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1527 ConcurrentMark* _cm; |
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1528 CalcLiveObjectsClosure _calc_cl; |
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1529 BitMap* _region_bm; // Region BM to be verified |
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1530 BitMap* _card_bm; // Card BM to be verified |
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1531 bool _verbose; // verbose output? |
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1532 |
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1533 BitMap* _exp_region_bm; // Expected Region BM values |
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1534 BitMap* _exp_card_bm; // Expected card BM values |
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1535 |
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1536 int _failures; |
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1537 |
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1538 public: |
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1539 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1540 BitMap* region_bm, |
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1541 BitMap* card_bm, |
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1542 BitMap* exp_region_bm, |
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1543 BitMap* exp_card_bm, |
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1544 bool verbose) : |
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1545 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1546 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1547 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1548 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1549 _failures(0) { } |
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1550 |
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1551 int failures() const { return _failures; } |
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1552 |
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1553 bool doHeapRegion(HeapRegion* hr) { |
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1554 if (hr->continuesHumongous()) { |
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1555 // We will ignore these here and process them when their |
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1556 // associated "starts humongous" region is processed (see |
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1557 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1558 // associated "starts humongous" region to have their bit set to |
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1559 // 1 since, due to the region chunking in the parallel region |
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1560 // iteration, a "continues humongous" region might be visited |
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1561 // before its associated "starts humongous". |
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1562 return false; |
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1563 } |
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1564 |
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1565 int failures = 0; |
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1566 |
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1567 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1568 // this region and set the corresponding bits in the expected region |
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1569 // and card bitmaps. |
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1570 bool res = _calc_cl.doHeapRegion(hr); |
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1571 assert(res == false, "should be continuing"); |
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1572 |
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1573 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1574 Mutex::_no_safepoint_check_flag); |
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1575 |
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1576 // Verify the marked bytes for this region. |
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1577 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1578 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1579 |
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1580 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1581 // we have missed accounting some objects during the actual marking. |
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1582 if (exp_marked_bytes > act_marked_bytes) { |
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1583 if (_verbose) { |
6010
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1584 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
4836
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1585 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1586 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1587 } |
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1588 failures += 1; |
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|
1589 } |
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|
1590 |
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1591 // Verify the bit, for this region, in the actual and expected |
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1592 // (which was just calculated) region bit maps. |
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1593 // We're not OK if the bit in the calculated expected region |
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1594 // bitmap is set and the bit in the actual region bitmap is not. |
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1595 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
4836
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1596 |
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1597 bool expected = _exp_region_bm->at(index); |
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1598 bool actual = _region_bm->at(index); |
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1599 if (expected && !actual) { |
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1600 if (_verbose) { |
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1601 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1602 "expected: %s, actual: %s", |
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1603 hr->hrs_index(), |
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1604 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1605 } |
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1606 failures += 1; |
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1607 } |
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|
1608 |
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1609 // Verify that the card bit maps for the cards spanned by the current |
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1610 // region match. We have an error if we have a set bit in the expected |
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1611 // bit map and the corresponding bit in the actual bitmap is not set. |
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|
1612 |
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1613 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1614 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1615 |
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1616 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1617 expected = _exp_card_bm->at(i); |
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1618 actual = _card_bm->at(i); |
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|
1619 |
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1620 if (expected && !actual) { |
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|
1621 if (_verbose) { |
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1622 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1623 "expected: %s, actual: %s", |
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|
1624 hr->hrs_index(), i, |
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|
1625 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
4836
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|
1626 } |
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|
1627 failures += 1; |
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|
1628 } |
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|
1629 } |
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|
1630 |
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|
1631 if (failures > 0 && _verbose) { |
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|
1632 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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|
1633 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
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|
1634 HR_FORMAT_PARAMS(hr), p2i(hr->next_top_at_mark_start()), |
4836
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|
1635 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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|
1636 } |
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|
1637 |
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|
1638 _failures += failures; |
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|
1639 |
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|
1640 // We could stop iteration over the heap when we |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1641 // find the first violating region by returning true. |
4836
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|
1642 return false; |
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|
1643 } |
342 | 1644 }; |
1645 | |
4836
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|
1646 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
d30fa85f9994
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|
1647 protected: |
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|
1648 G1CollectedHeap* _g1h; |
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|
1649 ConcurrentMark* _cm; |
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|
1650 BitMap* _actual_region_bm; |
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|
1651 BitMap* _actual_card_bm; |
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|
1652 |
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|
1653 uint _n_workers; |
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|
1654 |
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|
1655 BitMap* _expected_region_bm; |
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|
1656 BitMap* _expected_card_bm; |
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|
1657 |
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|
1658 int _failures; |
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|
1659 bool _verbose; |
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|
1660 |
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|
1661 public: |
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diff
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|
1662 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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|
1663 BitMap* region_bm, BitMap* card_bm, |
d30fa85f9994
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|
1664 BitMap* expected_region_bm, BitMap* expected_card_bm) |
d30fa85f9994
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|
1665 : AbstractGangTask("G1 verify final counting"), |
d30fa85f9994
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|
1666 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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|
1667 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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|
1668 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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|
1669 _failures(0), _verbose(false), |
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|
1670 _n_workers(0) { |
d30fa85f9994
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|
1671 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1672 |
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diff
changeset
|
1673 // Use the value already set as the number of active threads |
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diff
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|
1674 // in the call to run_task(). |
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diff
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|
1675 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1676 assert( _g1h->workers()->active_workers() > 0, |
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|
1677 "Should have been previously set"); |
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|
1678 _n_workers = _g1h->workers()->active_workers(); |
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diff
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|
1679 } else { |
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diff
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|
1680 _n_workers = 1; |
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diff
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|
1681 } |
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diff
changeset
|
1682 |
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|
1683 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1684 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1685 |
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|
1686 _verbose = _cm->verbose_medium(); |
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|
1687 } |
d30fa85f9994
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changeset
|
1688 |
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diff
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|
1689 void work(uint worker_id) { |
d30fa85f9994
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diff
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|
1690 assert(worker_id < _n_workers, "invariant"); |
d30fa85f9994
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|
1691 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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6750
diff
changeset
|
1692 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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|
1693 _actual_region_bm, _actual_card_bm, |
d30fa85f9994
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changeset
|
1694 _expected_region_bm, |
d30fa85f9994
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diff
changeset
|
1695 _expected_card_bm, |
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diff
changeset
|
1696 _verbose); |
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diff
changeset
|
1697 |
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diff
changeset
|
1698 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1699 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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diff
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|
1700 worker_id, |
d30fa85f9994
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diff
changeset
|
1701 _n_workers, |
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diff
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|
1702 HeapRegion::VerifyCountClaimValue); |
d30fa85f9994
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|
1703 } else { |
d30fa85f9994
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1704 _g1h->heap_region_iterate(&verify_cl); |
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1705 } |
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1706 |
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1707 Atomic::add(verify_cl.failures(), &_failures); |
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1708 } |
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1709 |
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1710 int failures() const { return _failures; } |
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1711 }; |
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1712 |
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1713 // Closure that finalizes the liveness counting data. |
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1714 // Used during the cleanup pause. |
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1715 // Sets the bits corresponding to the interval [NTAMS, top] |
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1716 // (which contains the implicitly live objects) in the |
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1717 // card liveness bitmap. Also sets the bit for each region, |
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1718 // containing live data, in the region liveness bitmap. |
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1719 |
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1720 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
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1721 public: |
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1722 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
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1723 BitMap* region_bm, |
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1724 BitMap* card_bm) : |
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1725 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
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1726 |
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1727 bool doHeapRegion(HeapRegion* hr) { |
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1728 |
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1729 if (hr->continuesHumongous()) { |
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1730 // We will ignore these here and process them when their |
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1731 // associated "starts humongous" region is processed (see |
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1732 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1733 // associated "starts humongous" region to have their bit set to |
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1734 // 1 since, due to the region chunking in the parallel region |
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1735 // iteration, a "continues humongous" region might be visited |
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1736 // before its associated "starts humongous". |
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1737 return false; |
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1738 } |
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1739 |
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1740 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1741 HeapWord* top = hr->top(); |
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1742 |
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1743 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
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1744 |
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1745 // Mark the allocated-since-marking portion... |
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1746 if (ntams < top) { |
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1747 // This definitely means the region has live objects. |
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1748 set_bit_for_region(hr); |
6812
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1749 |
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1750 // Now set the bits in the card bitmap for [ntams, top) |
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1751 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1752 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1753 |
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1754 // Note: if we're looking at the last region in heap - top |
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1755 // could be actually just beyond the end of the heap; end_idx |
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1756 // will then correspond to a (non-existent) card that is also |
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1757 // just beyond the heap. |
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1758 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1759 // end of object is not card aligned - increment to cover |
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1760 // all the cards spanned by the object |
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1761 end_idx += 1; |
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1762 } |
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1763 |
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1764 assert(end_idx <= _card_bm->size(), |
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1765 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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1766 end_idx, _card_bm->size())); |
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1767 assert(start_idx < _card_bm->size(), |
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1768 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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1769 start_idx, _card_bm->size())); |
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1770 |
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1771 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
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1772 } |
4836
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1773 |
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1774 // Set the bit for the region if it contains live data |
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1775 if (hr->next_marked_bytes() > 0) { |
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1776 set_bit_for_region(hr); |
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1777 } |
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1778 |
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1779 return false; |
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|
1780 } |
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|
1781 }; |
342 | 1782 |
1783 class G1ParFinalCountTask: public AbstractGangTask { | |
1784 protected: | |
1785 G1CollectedHeap* _g1h; | |
4836
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1786 ConcurrentMark* _cm; |
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1787 BitMap* _actual_region_bm; |
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1788 BitMap* _actual_card_bm; |
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1789 |
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1790 uint _n_workers; |
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1791 |
342 | 1792 public: |
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1793 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1794 : AbstractGangTask("G1 final counting"), |
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1795 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1796 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1797 _n_workers(0) { |
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1798 // Use the value already set as the number of active threads |
6011 | 1799 // in the call to run_task(). |
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1800 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1801 assert( _g1h->workers()->active_workers() > 0, |
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1802 "Should have been previously set"); |
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1803 _n_workers = _g1h->workers()->active_workers(); |
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1804 } else { |
342 | 1805 _n_workers = 1; |
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1806 } |
342 | 1807 } |
1808 | |
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1809 void work(uint worker_id) { |
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1810 assert(worker_id < _n_workers, "invariant"); |
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1811 |
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1812 FinalCountDataUpdateClosure final_update_cl(_g1h, |
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1813 _actual_region_bm, |
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1814 _actual_card_bm); |
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1815 |
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1816 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1817 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1818 worker_id, |
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1819 _n_workers, |
355 | 1820 HeapRegion::FinalCountClaimValue); |
342 | 1821 } else { |
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1822 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1823 } |
1824 } | |
1825 }; | |
1826 | |
1827 class G1ParNoteEndTask; | |
1828 | |
1829 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1830 G1CollectedHeap* _g1; | |
1831 size_t _max_live_bytes; | |
6010
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1832 uint _regions_claimed; |
342 | 1833 size_t _freed_bytes; |
2173 | 1834 FreeRegionList* _local_cleanup_list; |
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1835 HeapRegionSetCount _old_regions_removed; |
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1836 HeapRegionSetCount _humongous_regions_removed; |
2173 | 1837 HRRSCleanupTask* _hrrs_cleanup_task; |
342 | 1838 double _claimed_region_time; |
1839 double _max_region_time; | |
1840 | |
1841 public: | |
1842 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1843 FreeRegionList* local_cleanup_list, |
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1844 HRRSCleanupTask* hrrs_cleanup_task) : |
17844
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1845 _g1(g1), |
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1846 _max_live_bytes(0), _regions_claimed(0), |
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1847 _freed_bytes(0), |
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1848 _claimed_region_time(0.0), _max_region_time(0.0), |
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1849 _local_cleanup_list(local_cleanup_list), |
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|
1850 _old_regions_removed(), |
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1851 _humongous_regions_removed(), |
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1852 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1853 |
342 | 1854 size_t freed_bytes() { return _freed_bytes; } |
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1855 const HeapRegionSetCount& old_regions_removed() { return _old_regions_removed; } |
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1856 const HeapRegionSetCount& humongous_regions_removed() { return _humongous_regions_removed; } |
342 | 1857 |
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1858 bool doHeapRegion(HeapRegion *hr) { |
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1859 if (hr->continuesHumongous()) { |
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1860 return false; |
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1861 } |
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1862 // We use a claim value of zero here because all regions |
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1863 // were claimed with value 1 in the FinalCount task. |
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1864 _g1->reset_gc_time_stamps(hr); |
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1865 double start = os::elapsedTime(); |
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1866 _regions_claimed++; |
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1867 hr->note_end_of_marking(); |
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1868 _max_live_bytes += hr->max_live_bytes(); |
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1869 |
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1870 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { |
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1871 _freed_bytes += hr->used(); |
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1872 hr->set_containing_set(NULL); |
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1873 if (hr->isHumongous()) { |
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1874 assert(hr->startsHumongous(), "we should only see starts humongous"); |
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1875 _humongous_regions_removed.increment(1u, hr->capacity()); |
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1876 _g1->free_humongous_region(hr, _local_cleanup_list, true); |
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1877 } else { |
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1878 _old_regions_removed.increment(1u, hr->capacity()); |
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1879 _g1->free_region(hr, _local_cleanup_list, true); |
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1880 } |
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1881 } else { |
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1882 hr->rem_set()->do_cleanup_work(_hrrs_cleanup_task); |
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1883 } |
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1884 |
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1885 double region_time = (os::elapsedTime() - start); |
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1886 _claimed_region_time += region_time; |
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1887 if (region_time > _max_region_time) { |
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1888 _max_region_time = region_time; |
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1889 } |
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1890 return false; |
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1891 } |
342 | 1892 |
1893 size_t max_live_bytes() { return _max_live_bytes; } | |
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1894 uint regions_claimed() { return _regions_claimed; } |
342 | 1895 double claimed_region_time_sec() { return _claimed_region_time; } |
1896 double max_region_time_sec() { return _max_region_time; } | |
1897 }; | |
1898 | |
1899 class G1ParNoteEndTask: public AbstractGangTask { | |
1900 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1901 |
342 | 1902 protected: |
1903 G1CollectedHeap* _g1h; | |
1904 size_t _max_live_bytes; | |
1905 size_t _freed_bytes; | |
2152 | 1906 FreeRegionList* _cleanup_list; |
1907 | |
342 | 1908 public: |
1909 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1910 FreeRegionList* cleanup_list) : |
342 | 1911 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1912 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1913 |
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1914 void work(uint worker_id) { |
342 | 1915 double start = os::elapsedTime(); |
2173 | 1916 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1917 HRRSCleanupTask hrrs_cleanup_task; | |
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1918 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, &local_cleanup_list, |
2173 | 1919 &hrrs_cleanup_task); |
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1920 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1921 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1922 _g1h->workers()->active_workers(), |
355 | 1923 HeapRegion::NoteEndClaimValue); |
342 | 1924 } else { |
1925 _g1h->heap_region_iterate(&g1_note_end); | |
1926 } | |
1927 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1928 | |
2152 | 1929 // Now update the lists |
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1930 _g1h->remove_from_old_sets(g1_note_end.old_regions_removed(), g1_note_end.humongous_regions_removed()); |
342 | 1931 { |
1932 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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1933 _g1h->decrement_summary_bytes(g1_note_end.freed_bytes()); |
342 | 1934 _max_live_bytes += g1_note_end.max_live_bytes(); |
1935 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1936 |
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1937 // If we iterate over the global cleanup list at the end of |
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1938 // cleanup to do this printing we will not guarantee to only |
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1939 // generate output for the newly-reclaimed regions (the list |
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1940 // might not be empty at the beginning of cleanup; we might |
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1941 // still be working on its previous contents). So we do the |
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1942 // printing here, before we append the new regions to the global |
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1943 // cleanup list. |
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1944 |
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1945 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1946 if (hr_printer->is_active()) { |
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1947 FreeRegionListIterator iter(&local_cleanup_list); |
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1948 while (iter.more_available()) { |
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1949 HeapRegion* hr = iter.get_next(); |
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1950 hr_printer->cleanup(hr); |
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1951 } |
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1952 } |
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1953 |
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1954 _cleanup_list->add_ordered(&local_cleanup_list); |
2173 | 1955 assert(local_cleanup_list.is_empty(), "post-condition"); |
1956 | |
1957 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1958 } |
1959 } | |
1960 size_t max_live_bytes() { return _max_live_bytes; } | |
1961 size_t freed_bytes() { return _freed_bytes; } | |
1962 }; | |
1963 | |
1964 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1965 protected: | |
1966 G1RemSet* _g1rs; | |
1967 BitMap* _region_bm; | |
1968 BitMap* _card_bm; | |
1969 public: | |
1970 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1971 BitMap* region_bm, BitMap* card_bm) : | |
1972 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1973 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1974 |
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1975 void work(uint worker_id) { |
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1976 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1977 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1978 HeapRegion::ScrubRemSetClaimValue); |
342 | 1979 } else { |
1980 _g1rs->scrub(_region_bm, _card_bm); | |
1981 } | |
1982 } | |
1983 | |
1984 }; | |
1985 | |
1986 void ConcurrentMark::cleanup() { | |
1987 // world is stopped at this checkpoint | |
1988 assert(SafepointSynchronize::is_at_safepoint(), | |
1989 "world should be stopped"); | |
1990 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1991 | |
1992 // If a full collection has happened, we shouldn't do this. | |
1993 if (has_aborted()) { | |
1994 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1995 return; | |
1996 } | |
1997 | |
2152 | 1998 g1h->verify_region_sets_optional(); |
1999 | |
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2000 if (VerifyDuringGC) { |
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2001 HandleMark hm; // handle scope |
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2002 Universe::heap()->prepare_for_verify(); |
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2003 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2004 " VerifyDuringGC:(before)"); |
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2005 } |
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2006 |
342 | 2007 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
2008 g1p->record_concurrent_mark_cleanup_start(); | |
2009 | |
2010 double start = os::elapsedTime(); | |
2011 | |
2173 | 2012 HeapRegionRemSet::reset_for_cleanup_tasks(); |
2013 | |
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2014 uint n_workers; |
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2015 |
342 | 2016 // Do counting once more with the world stopped for good measure. |
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2017 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2018 |
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2019 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2020 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 2021 "sanity check"); |
2022 | |
4711 | 2023 g1h->set_par_threads(); |
2024 n_workers = g1h->n_par_threads(); | |
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2025 assert(g1h->n_par_threads() == n_workers, |
4711 | 2026 "Should not have been reset"); |
342 | 2027 g1h->workers()->run_task(&g1_par_count_task); |
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2028 // Done with the parallel phase so reset to 0. |
342 | 2029 g1h->set_par_threads(0); |
355 | 2030 |
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2031 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2032 "sanity check"); |
342 | 2033 } else { |
4711 | 2034 n_workers = 1; |
342 | 2035 g1_par_count_task.work(0); |
2036 } | |
2037 | |
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2038 if (VerifyDuringGC) { |
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2039 // Verify that the counting data accumulated during marking matches |
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2040 // that calculated by walking the marking bitmap. |
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2041 |
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2042 // Bitmaps to hold expected values |
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2043 BitMap expected_region_bm(_region_bm.size(), true); |
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2044 BitMap expected_card_bm(_card_bm.size(), true); |
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2045 |
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2046 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2047 &_region_bm, |
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2048 &_card_bm, |
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2049 &expected_region_bm, |
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|
2050 &expected_card_bm); |
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|
2051 |
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6484965: G1: piggy-back liveness accounting phase on marking
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|
2052 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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|
2053 g1h->set_par_threads((int)n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2054 g1h->workers()->run_task(&g1_par_verify_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
2055 // Done with the parallel phase so reset to 0. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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|
2056 g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2057 |
d30fa85f9994
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changeset
|
2058 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2059 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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diff
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|
2060 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
2061 g1_par_verify_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2062 } |
d30fa85f9994
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|
2063 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2064 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
d30fa85f9994
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|
2065 } |
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|
2066 |
342 | 2067 size_t start_used_bytes = g1h->used(); |
2068 g1h->set_marking_complete(); | |
2069 | |
2070 double count_end = os::elapsedTime(); | |
2071 double this_final_counting_time = (count_end - start); | |
2072 _total_counting_time += this_final_counting_time; | |
2073 | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
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|
2074 if (G1PrintRegionLivenessInfo) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2075 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2076 _g1h->heap_region_iterate(&cl); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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|
2077 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2078 |
342 | 2079 // Install newly created mark bitMap as "prev". |
2080 swapMarkBitMaps(); | |
2081 | |
2082 g1h->reset_gc_time_stamp(); | |
2083 | |
2084 // Note end of marking in all heap regions. | |
2152 | 2085 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
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|
2086 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2087 g1h->set_par_threads((int)n_workers); |
342 | 2088 g1h->workers()->run_task(&g1_par_note_end_task); |
2089 g1h->set_par_threads(0); | |
355 | 2090 |
2091 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2092 "sanity check"); | |
342 | 2093 } else { |
2094 g1_par_note_end_task.work(0); | |
2095 } | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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6220
diff
changeset
|
2096 g1h->check_gc_time_stamps(); |
2152 | 2097 |
2098 if (!cleanup_list_is_empty()) { | |
2099 // The cleanup list is not empty, so we'll have to process it | |
2100 // concurrently. Notify anyone else that might be wanting free | |
2101 // regions that there will be more free regions coming soon. | |
2102 g1h->set_free_regions_coming(); | |
2103 } | |
342 | 2104 |
2105 // call below, since it affects the metric by which we sort the heap | |
2106 // regions. | |
2107 if (G1ScrubRemSets) { | |
2108 double rs_scrub_start = os::elapsedTime(); | |
2109 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
1833
8b10f48633dc
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jmasa
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1719
diff
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|
2110 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
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|
2111 g1h->set_par_threads((int)n_workers); |
342 | 2112 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2113 g1h->set_par_threads(0); | |
355 | 2114 |
2115 assert(g1h->check_heap_region_claim_values( | |
2116 HeapRegion::ScrubRemSetClaimValue), | |
2117 "sanity check"); | |
342 | 2118 } else { |
2119 g1_par_scrub_rs_task.work(0); | |
2120 } | |
2121 | |
2122 double rs_scrub_end = os::elapsedTime(); | |
2123 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2124 _total_rs_scrub_time += this_rs_scrub_time; | |
2125 } | |
2126 | |
2127 // this will also free any regions totally full of garbage objects, | |
2128 // and sort the regions. | |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4093
diff
changeset
|
2129 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2130 |
2131 // Statistics. | |
2132 double end = os::elapsedTime(); | |
2133 _cleanup_times.add((end - start) * 1000.0); | |
2134 | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2135 if (G1Log::fine()) { |
342 | 2136 g1h->print_size_transition(gclog_or_tty, |
2137 start_used_bytes, | |
2138 g1h->used(), | |
2139 g1h->capacity()); | |
2140 } | |
2141 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3977
diff
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|
2142 // Clean up will have freed any regions completely full of garbage. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3977
diff
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|
2143 // Update the soft reference policy with the new heap occupancy. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2144 Universe::update_heap_info_at_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2145 |
751 | 2146 if (VerifyDuringGC) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2147 HandleMark hm; // handle scope |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
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|
2148 Universe::heap()->prepare_for_verify(); |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
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9076
diff
changeset
|
2149 Universe::verify(VerifyOption_G1UsePrevMarking, |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
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9076
diff
changeset
|
2150 " VerifyDuringGC:(after)"); |
342 | 2151 } |
2152 | 2152 |
2153 g1h->verify_region_sets_optional(); | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2154 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2155 // We need to make this be a "collection" so any collection pause that |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2156 // races with it goes around and waits for completeCleanup to finish. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2157 g1h->increment_total_collections(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2158 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2159 // Clean out dead classes and update Metaspace sizes. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2160 ClassLoaderDataGraph::purge(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2161 MetaspaceGC::compute_new_size(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2162 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2163 // We reclaimed old regions so we should calculate the sizes to make |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2164 // sure we update the old gen/space data. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2165 g1h->g1mm()->update_sizes(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2166 |
10405 | 2167 g1h->trace_heap_after_concurrent_cycle(); |
342 | 2168 } |
2169 | |
2170 void ConcurrentMark::completeCleanup() { | |
2171 if (has_aborted()) return; | |
2172 | |
2152 | 2173 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2174 | |
17841
14bd75c9dbfa
8039089: List verification enabled in product builds
jwilhelm
parents:
17773
diff
changeset
|
2175 _cleanup_list.verify_optional(); |
2361 | 2176 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2177 |
2178 if (G1ConcRegionFreeingVerbose) { | |
2179 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
2180 "cleanup list has %u entries", |
2152 | 2181 _cleanup_list.length()); |
2182 } | |
2183 | |
2184 // Noone else should be accessing the _cleanup_list at this point, | |
2185 // so it's not necessary to take any locks | |
2186 while (!_cleanup_list.is_empty()) { | |
2187 HeapRegion* hr = _cleanup_list.remove_head(); | |
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
jwilhelm
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17750
diff
changeset
|
2188 assert(hr != NULL, "Got NULL from a non-empty list"); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3316
diff
changeset
|
2189 hr->par_clear(); |
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
jwilhelm
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17750
diff
changeset
|
2190 tmp_free_list.add_ordered(hr); |
2152 | 2191 |
2192 // Instead of adding one region at a time to the secondary_free_list, | |
2193 // we accumulate them in the local list and move them a few at a | |
2194 // time. This also cuts down on the number of notify_all() calls | |
2195 // we do during this process. We'll also append the local list when | |
2196 // _cleanup_list is empty (which means we just removed the last | |
2197 // region from the _cleanup_list). | |
2361 | 2198 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2199 _cleanup_list.is_empty()) { |
2200 if (G1ConcRegionFreeingVerbose) { | |
2201 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
2202 "appending %u entries to the secondary_free_list, " |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2203 "cleanup list still has %u entries", |
2361 | 2204 tmp_free_list.length(), |
2152 | 2205 _cleanup_list.length()); |
342 | 2206 } |
2152 | 2207 |
2208 { | |
2209 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
17773
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8036025: Sort the freelist in order to shrink the heap
jwilhelm
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17750
diff
changeset
|
2210 g1h->secondary_free_list_add(&tmp_free_list); |
2152 | 2211 SecondaryFreeList_lock->notify_all(); |
2212 } | |
2213 | |
2214 if (G1StressConcRegionFreeing) { | |
2215 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2216 os::sleep(Thread::current(), (jlong) 1, false); | |
2217 } | |
2218 } | |
342 | 2219 } |
2220 } | |
2361 | 2221 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2222 } |
2223 | |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2224 // Supporting Object and Oop closures for reference discovery |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2225 // and processing in during marking |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2226 |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2227 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2228 HeapWord* addr = (HeapWord*)obj; |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2229 return addr != NULL && |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2230 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
changeset
|
2231 } |
342 | 2232 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2233 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2234 // Uses the CMTask associated with a worker thread (for serial reference |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2235 // processing the CMTask for worker 0 is used) to preserve (mark) and |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2236 // trace referent objects. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2237 // |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2238 // Using the CMTask and embedded local queues avoids having the worker |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2239 // threads operating on the global mark stack. This reduces the risk |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2240 // of overflowing the stack - which we would rather avoid at this late |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2241 // state. Also using the tasks' local queues removes the potential |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2242 // of the workers interfering with each other that could occur if |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2243 // operating on the global stack. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2244 |
f90b9bceb8e5
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8008
diff
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|
2245 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2246 ConcurrentMark* _cm; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
2247 CMTask* _task; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
2248 int _ref_counter_limit; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
2249 int _ref_counter; |
fa08949fe0cb
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8744
diff
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|
2250 bool _is_serial; |
2174
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6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2251 public: |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
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|
2252 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2253 _cm(cm), _task(task), _is_serial(is_serial), |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
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|
2254 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2255 assert(_ref_counter_limit > 0, "sanity"); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2256 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2257 _ref_counter = _ref_counter_limit; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2258 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2259 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2260 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2261 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2262 |
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2263 template <class T> void do_oop_work(T* p) { |
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2264 if (!_cm->has_overflown()) { |
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2265 oop obj = oopDesc::load_decode_heap_oop(p); |
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2266 if (_cm->verbose_high()) { |
6862
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2267 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
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2268 "*"PTR_FORMAT" = "PTR_FORMAT, |
17937
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2269 _task->worker_id(), p2i(p), p2i((void*) obj)); |
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2270 } |
2174
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2271 |
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2272 _task->deal_with_reference(obj); |
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2273 _ref_counter--; |
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2274 |
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2275 if (_ref_counter == 0) { |
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2276 // We have dealt with _ref_counter_limit references, pushing them |
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2277 // and objects reachable from them on to the local stack (and |
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2278 // possibly the global stack). Call CMTask::do_marking_step() to |
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2279 // process these entries. |
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2280 // |
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2281 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
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2282 // there's nothing more to do (i.e. we're done with the entries that |
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2283 // were pushed as a result of the CMTask::deal_with_reference() calls |
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2284 // above) or we overflow. |
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2285 // |
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2286 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2287 // flag while there may still be some work to do. (See the comment at |
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2288 // the beginning of CMTask::do_marking_step() for those conditions - |
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2289 // one of which is reaching the specified time target.) It is only |
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2290 // when CMTask::do_marking_step() returns without setting the |
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2291 // has_aborted() flag that the marking step has completed. |
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2292 do { |
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2293 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2294 _task->do_marking_step(mark_step_duration_ms, |
8787
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2295 false /* do_termination */, |
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2296 _is_serial); |
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2297 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2298 _ref_counter = _ref_counter_limit; |
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2299 } |
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2300 } else { |
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2301 if (_cm->verbose_high()) { |
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2302 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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2303 } |
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2304 } |
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|
2305 } |
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|
2306 }; |
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2307 |
8014
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2308 // 'Drain' oop closure used by both serial and parallel reference processing. |
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2309 // Uses the CMTask associated with a given worker thread (for serial |
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2310 // reference processing the CMtask for worker 0 is used). Calls the |
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2311 // do_marking_step routine, with an unbelievably large timeout value, |
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2312 // to drain the marking data structures of the remaining entries |
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2313 // added by the 'keep alive' oop closure above. |
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|
2314 |
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|
2315 class G1CMDrainMarkingStackClosure: public VoidClosure { |
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2316 ConcurrentMark* _cm; |
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2317 CMTask* _task; |
8787
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2318 bool _is_serial; |
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2319 public: |
8787
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2320 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2321 _cm(cm), _task(task), _is_serial(is_serial) { |
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2322 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
8014
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|
2323 } |
2174
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|
2324 |
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|
2325 void do_void() { |
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|
2326 do { |
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|
2327 if (_cm->verbose_high()) { |
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|
2328 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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|
2329 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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|
2330 } |
2174
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|
2331 |
8014
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|
2332 // We call CMTask::do_marking_step() to completely drain the local |
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|
2333 // and global marking stacks of entries pushed by the 'keep alive' |
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|
2334 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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|
2335 // |
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|
2336 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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|
2337 // if there's nothing more to do (i.e. we'completely drained the |
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|
2338 // entries that were pushed as a a result of applying the 'keep alive' |
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|
2339 // closure to the entries on the discovered ref lists) or we overflow |
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|
2340 // the global marking stack. |
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|
2341 // |
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|
2342 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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|
2343 // flag while there may still be some work to do. (See the comment at |
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|
2344 // the beginning of CMTask::do_marking_step() for those conditions - |
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|
2345 // one of which is reaching the specified time target.) It is only |
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|
2346 // when CMTask::do_marking_step() returns without setting the |
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|
2347 // has_aborted() flag that the marking step has completed. |
2174
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|
2348 |
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|
2349 _task->do_marking_step(1000000000.0 /* something very large */, |
8787
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|
2350 true /* do_termination */, |
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|
2351 _is_serial); |
2174
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|
2352 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2353 } |
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|
2354 }; |
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|
2355 |
3979
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|
2356 // Implementation of AbstractRefProcTaskExecutor for parallel |
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|
2357 // reference processing at the end of G1 concurrent marking |
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|
2358 |
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|
2359 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
2174
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|
2360 private: |
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|
2361 G1CollectedHeap* _g1h; |
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|
2362 ConcurrentMark* _cm; |
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|
2363 WorkGang* _workers; |
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|
2364 int _active_workers; |
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|
2365 |
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|
2366 public: |
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|
2367 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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|
2368 ConcurrentMark* cm, |
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|
2369 WorkGang* workers, |
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|
2370 int n_workers) : |
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2371 _g1h(g1h), _cm(cm), |
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|
2372 _workers(workers), _active_workers(n_workers) { } |
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|
2373 |
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|
2374 // Executes the given task using concurrent marking worker threads. |
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|
2375 virtual void execute(ProcessTask& task); |
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|
2376 virtual void execute(EnqueueTask& task); |
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|
2377 }; |
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|
2378 |
3979
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|
2379 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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|
2380 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2381 ProcessTask& _proc_task; |
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|
2382 G1CollectedHeap* _g1h; |
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|
2383 ConcurrentMark* _cm; |
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|
2384 |
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|
2385 public: |
3979
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|
2386 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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|
2387 G1CollectedHeap* g1h, |
4093
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|
2388 ConcurrentMark* cm) : |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2389 AbstractGangTask("Process reference objects in parallel"), |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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parents:
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diff
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|
2390 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
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|
2391 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
2392 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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parents:
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diff
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|
2393 } |
2174
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6608385: G1: need to support parallel reference processing
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diff
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|
2394 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
changeset
|
2395 virtual void work(uint worker_id) { |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
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|
2396 CMTask* task = _cm->task(worker_id); |
2174
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6608385: G1: need to support parallel reference processing
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diff
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|
2397 G1CMIsAliveClosure g1_is_alive(_g1h); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
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|
2398 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
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|
2399 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
2174
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6608385: G1: need to support parallel reference processing
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|
2400 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
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|
2401 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
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|
2402 } |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2403 }; |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2404 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
2405 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
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|
2406 assert(_workers != NULL, "Need parallel worker threads."); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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diff
changeset
|
2407 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
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6608385: G1: need to support parallel reference processing
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|
2408 |
4093
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diff
changeset
|
2409 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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|
2410 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
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diff
changeset
|
2411 // We need to reset the concurrency level before each |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2412 // proxy task execution, so that the termination protocol |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2413 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2414 // how many workers to wait for. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
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|
2415 _cm->set_concurrency(_active_workers); |
2174
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6608385: G1: need to support parallel reference processing
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diff
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|
2416 _g1h->set_par_threads(_active_workers); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2417 _workers->run_task(&proc_task_proxy); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2418 _g1h->set_par_threads(0); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2419 } |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2420 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
2421 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2422 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2423 EnqueueTask& _enq_task; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2424 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2425 public: |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2426 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2427 AbstractGangTask("Enqueue reference objects in parallel"), |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
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|
2428 _enq_task(enq_task) { } |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2429 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2430 virtual void work(uint worker_id) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2431 _enq_task.work(worker_id); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2432 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2433 }; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2434 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2435 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2436 assert(_workers != NULL, "Need parallel worker threads."); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2437 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2438 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2439 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
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changeset
|
2440 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2441 // Not strictly necessary but... |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2442 // |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2443 // We need to reset the concurrency level before each |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2444 // proxy task execution, so that the termination protocol |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2445 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2446 // how many workers to wait for. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2447 _cm->set_concurrency(_active_workers); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2448 _g1h->set_par_threads(_active_workers); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2449 _workers->run_task(&enq_task_proxy); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2450 _g1h->set_par_threads(0); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2451 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2452 |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2453 void ConcurrentMark::weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2454 G1CollectedHeap::heap()->parallel_cleaning(is_alive, true, true, purged_classes); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2455 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2456 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2457 // Helper class to get rid of some boilerplate code. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2458 class G1RemarkGCTraceTime : public GCTraceTime { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2459 static bool doit_and_prepend(bool doit) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2460 if (doit) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2461 gclog_or_tty->put(' '); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2462 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2463 return doit; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2464 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2465 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2466 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2467 G1RemarkGCTraceTime(const char* title, bool doit) |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2468 : GCTraceTime(title, doit_and_prepend(doit), false, G1CollectedHeap::heap()->gc_timer_cm(), |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2469 G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2470 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2471 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2472 |
342 | 2473 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2474 if (has_overflown()) { |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2475 // Skip processing the discovered references if we have |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2476 // overflown the global marking stack. Reference objects |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2477 // only get discovered once so it is OK to not |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2478 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2479 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2480 // less reference objects are discovered. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2481 return; |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2482 } |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2483 |
342 | 2484 ResourceMark rm; |
2485 HandleMark hm; | |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2486 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2487 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2488 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2489 // Is alive closure. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2490 G1CMIsAliveClosure g1_is_alive(g1h); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2491 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2492 // Inner scope to exclude the cleaning of the string and symbol |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2493 // tables from the displayed time. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2494 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2495 if (G1Log::finer()) { |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2496 gclog_or_tty->put(' '); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2497 } |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2498 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm(), concurrent_gc_id()); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2499 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2500 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2501 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2502 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2503 // about how reference processing currently works in G1. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2504 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2505 // Set the soft reference policy |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2506 rp->setup_policy(clear_all_soft_refs); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2507 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2508 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2509 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2510 // in serial reference processing. Note these closures are also |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2511 // used for serially processing (by the the current thread) the |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2512 // JNI references during parallel reference processing. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2513 // |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2514 // These closures do not need to synchronize with the worker |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2515 // threads involved in parallel reference processing as these |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2516 // instances are executed serially by the current thread (e.g. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2517 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2518 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2519 // |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2520 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2521 // their own instances of these closures, which do their own |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2522 // synchronization among themselves. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2523 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2524 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2525 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2526 // We need at least one active thread. If reference processing |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2527 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2528 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2529 // we utilize all the worker threads we can. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2530 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2531 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
|
2532 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2533 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2534 // Parallel processing task executor. |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2535 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2536 g1h->workers(), active_workers); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2537 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2538 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2539 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2540 // executing the remark task. |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2541 set_concurrency(active_workers); |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2542 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2543 // 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
|
2544 // 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
|
2545 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2546 // 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
|
2547 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2548 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2549 // Process the weak references. |
10405 | 2550 const ReferenceProcessorStats& stats = |
2551 rp->process_discovered_references(&g1_is_alive, | |
2552 &g1_keep_alive, | |
2553 &g1_drain_mark_stack, | |
2554 executor, | |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2555 g1h->gc_timer_cm(), |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2556 concurrent_gc_id()); |
10405 | 2557 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2558 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2559 // 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
|
2560 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2561 // global marking stack. |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2562 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2563 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2564 "mark stack should be empty (unless it overflowed)"); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2565 |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2566 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2567 // This should have been done already when we tried to push an |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2568 // entry on to the global mark stack. But let's do it again. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2569 set_has_overflown(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2570 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2571 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2572 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2573 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2574 rp->enqueue_discovered_references(executor); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2575 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2576 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2577 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2578 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2579 |
17750
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2580 if (has_overflown()) { |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2581 // We can not trust g1_is_alive if the marking stack overflowed |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2582 return; |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2583 } |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2584 |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2585 assert(_markStack.isEmpty(), "Marking should have completed"); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2586 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2587 // Unload Klasses, String, Symbols, Code Cache, etc. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2588 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2589 G1RemarkGCTraceTime trace("Unloading", G1Log::finer()); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2590 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2591 bool purged_classes; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2592 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2593 { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2594 G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest()); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2595 purged_classes = SystemDictionary::do_unloading(&g1_is_alive); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2596 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2597 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2598 { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2599 G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest()); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2600 weakRefsWorkParallelPart(&g1_is_alive, purged_classes); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2601 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2602 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2603 if (G1StringDedup::is_enabled()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2604 G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest()); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2605 G1StringDedup::unlink(&g1_is_alive); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2606 } |
342 | 2607 } |
2608 | |
2609 void ConcurrentMark::swapMarkBitMaps() { | |
2610 CMBitMapRO* temp = _prevMarkBitMap; | |
2611 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2612 _nextMarkBitMap = (CMBitMap*) temp; | |
2613 } | |
2614 | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2615 class CMObjectClosure; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2616 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2617 // Closure for iterating over objects, currently only used for |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2618 // processing SATB buffers. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2619 class CMObjectClosure : public ObjectClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2620 private: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2621 CMTask* _task; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2622 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2623 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2624 void do_object(oop obj) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2625 _task->deal_with_reference(obj); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2626 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2627 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2628 CMObjectClosure(CMTask* task) : _task(task) { } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2629 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2630 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2631 class G1RemarkThreadsClosure : public ThreadClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2632 CMObjectClosure _cm_obj; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2633 G1CMOopClosure _cm_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2634 MarkingCodeBlobClosure _code_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2635 int _thread_parity; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2636 bool _is_par; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2637 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2638 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2639 G1RemarkThreadsClosure(G1CollectedHeap* g1h, CMTask* task, bool is_par) : |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2640 _cm_obj(task), _cm_cl(g1h, g1h->concurrent_mark(), task), _code_cl(&_cm_cl, !CodeBlobToOopClosure::FixRelocations), |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2641 _thread_parity(SharedHeap::heap()->strong_roots_parity()), _is_par(is_par) {} |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2642 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2643 void do_thread(Thread* thread) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2644 if (thread->is_Java_thread()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2645 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2646 JavaThread* jt = (JavaThread*)thread; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2647 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2648 // In theory it should not be neccessary to explicitly walk the nmethods to find roots for concurrent marking |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2649 // however the liveness of oops reachable from nmethods have very complex lifecycles: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2650 // * Alive if on the stack of an executing method |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2651 // * Weakly reachable otherwise |
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2652 // Some objects reachable from nmethods, such as the class loader (or klass_holder) of the receiver should be |
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2653 // live by the SATB invariant but other oops recorded in nmethods may behave differently. |
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2654 jt->nmethods_do(&_code_cl); |
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|
2655 |
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2656 jt->satb_mark_queue().apply_closure_and_empty(&_cm_obj); |
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|
2657 } |
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|
2658 } else if (thread->is_VM_thread()) { |
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2659 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
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2660 JavaThread::satb_mark_queue_set().shared_satb_queue()->apply_closure_and_empty(&_cm_obj); |
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2661 } |
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|
2662 } |
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|
2663 } |
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|
2664 }; |
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2665 |
342 | 2666 class CMRemarkTask: public AbstractGangTask { |
2667 private: | |
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2668 ConcurrentMark* _cm; |
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2669 bool _is_serial; |
342 | 2670 public: |
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2671 void work(uint worker_id) { |
342 | 2672 // Since all available tasks are actually started, we should |
2673 // only proceed if we're supposed to be actived. | |
4728
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2674 if (worker_id < _cm->active_tasks()) { |
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2675 CMTask* task = _cm->task(worker_id); |
342 | 2676 task->record_start_time(); |
20278
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2677 { |
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|
2678 ResourceMark rm; |
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|
2679 HandleMark hm; |
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|
2680 |
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2681 G1RemarkThreadsClosure threads_f(G1CollectedHeap::heap(), task, !_is_serial); |
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2682 Threads::threads_do(&threads_f); |
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2683 } |
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2684 |
342 | 2685 do { |
2174
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|
2686 task->do_marking_step(1000000000.0 /* something very large */, |
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|
2687 true /* do_termination */, |
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|
2688 _is_serial); |
342 | 2689 } while (task->has_aborted() && !_cm->has_overflown()); |
2690 // If we overflow, then we do not want to restart. We instead | |
2691 // want to abort remark and do concurrent marking again. | |
2692 task->record_end_time(); | |
2693 } | |
2694 } | |
2695 | |
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2696 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
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2697 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2698 _cm->terminator()->reset_for_reuse(active_workers); |
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|
2699 } |
342 | 2700 }; |
2701 | |
2702 void ConcurrentMark::checkpointRootsFinalWork() { | |
2703 ResourceMark rm; | |
2704 HandleMark hm; | |
2705 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2706 | |
20278
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2707 G1RemarkGCTraceTime trace("Finalize Marking", G1Log::finer()); |
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2708 |
342 | 2709 g1h->ensure_parsability(false); |
2710 | |
1833
8b10f48633dc
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|
2711 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
2712 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
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|
2713 // this is remark, so we'll use up all active threads |
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|
2714 uint active_workers = g1h->workers()->active_workers(); |
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|
2715 if (active_workers == 0) { |
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|
2716 assert(active_workers > 0, "Should have been set earlier"); |
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|
2717 active_workers = (uint) ParallelGCThreads; |
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|
2718 g1h->workers()->set_active_workers(active_workers); |
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|
2719 } |
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e864cc14ca75
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|
2720 set_concurrency_and_phase(active_workers, false /* concurrent */); |
4095
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|
2721 // Leave _parallel_marking_threads at it's |
bca17e38de00
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diff
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|
2722 // value originally calculated in the ConcurrentMark |
bca17e38de00
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diff
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|
2723 // constructor and pass values of the active workers |
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|
2724 // through the gang in the task. |
342 | 2725 |
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|
2726 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
fa08949fe0cb
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|
2727 // We will start all available threads, even if we decide that the |
fa08949fe0cb
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changeset
|
2728 // active_workers will be fewer. The extra ones will just bail out |
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|
2729 // immediately. |
4095
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jmasa
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diff
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|
2730 g1h->set_par_threads(active_workers); |
342 | 2731 g1h->workers()->run_task(&remarkTask); |
2732 g1h->set_par_threads(0); | |
2733 } else { | |
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6863023: need non-perm oops in code cache for JSR 292
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|
2734 G1CollectedHeap::StrongRootsScope srs(g1h); |
4728
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|
2735 uint active_workers = 1; |
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|
2736 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2737 |
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|
2738 // Note - if there's no work gang then the VMThread will be |
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changeset
|
2739 // the thread to execute the remark - serially. We have |
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changeset
|
2740 // to pass true for the is_serial parameter so that |
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changeset
|
2741 // CMTask::do_marking_step() doesn't enter the sync |
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diff
changeset
|
2742 // barriers in the event of an overflow. Doing so will |
fa08949fe0cb
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8744
diff
changeset
|
2743 // cause an assert that the current thread is not a |
fa08949fe0cb
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changeset
|
2744 // concurrent GC thread. |
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changeset
|
2745 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2746 remarkTask.work(0); |
2747 } | |
1023
11d4857fe5e1
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1022
diff
changeset
|
2748 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
8789
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
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8788
diff
changeset
|
2749 guarantee(has_overflown() || |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
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8788
diff
changeset
|
2750 satb_mq_set.completed_buffers_num() == 0, |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
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diff
changeset
|
2751 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
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8788
diff
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|
2752 BOOL_TO_STR(has_overflown()), |
1179172e9ec9
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diff
changeset
|
2753 satb_mq_set.completed_buffers_num())); |
342 | 2754 |
2755 print_stats(); | |
2756 } | |
2757 | |
1044 | 2758 #ifndef PRODUCT |
2759 | |
1388 | 2760 class PrintReachableOopClosure: public OopClosure { |
342 | 2761 private: |
2762 G1CollectedHeap* _g1h; | |
2763 outputStream* _out; | |
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7004681: G1: Extend marking verification to Full GCs
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changeset
|
2764 VerifyOption _vo; |
1388 | 2765 bool _all; |
342 | 2766 |
2767 public: | |
3772
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changeset
|
2768 PrintReachableOopClosure(outputStream* out, |
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7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2769 VerifyOption vo, |
1388 | 2770 bool all) : |
1044 | 2771 _g1h(G1CollectedHeap::heap()), |
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|
2772 _out(out), _vo(vo), _all(all) { } |
342 | 2773 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2774 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
2775 void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
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|
2776 |
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|
2777 template <class T> void do_oop_work(T* p) { |
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diff
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|
2778 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2779 const char* str = NULL; |
2780 const char* str2 = ""; | |
2781 | |
1388 | 2782 if (obj == NULL) { |
2783 str = ""; | |
2784 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2785 str = " O"; | |
2786 } else { | |
342 | 2787 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
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diff
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|
2788 guarantee(hr != NULL, "invariant"); |
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diff
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|
2789 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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diff
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|
2790 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2791 |
2792 if (over_tams) { | |
1388 | 2793 str = " >"; |
2794 if (marked) { | |
342 | 2795 str2 = " AND MARKED"; |
1044 | 2796 } |
1388 | 2797 } else if (marked) { |
2798 str = " M"; | |
1044 | 2799 } else { |
1388 | 2800 str = " NOT"; |
1044 | 2801 } |
342 | 2802 } |
2803 | |
1388 | 2804 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
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diff
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|
2805 p2i(p), p2i((void*) obj), str, str2); |
342 | 2806 } |
2807 }; | |
2808 | |
1388 | 2809 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2810 private: |
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|
2811 G1CollectedHeap* _g1h; |
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|
2812 outputStream* _out; |
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|
2813 VerifyOption _vo; |
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|
2814 bool _all; |
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|
2815 HeapRegion* _hr; |
342 | 2816 |
2817 public: | |
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|
2818 PrintReachableObjectClosure(outputStream* out, |
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|
2819 VerifyOption vo, |
1388 | 2820 bool all, |
2821 HeapRegion* hr) : | |
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|
2822 _g1h(G1CollectedHeap::heap()), |
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|
2823 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2824 |
2825 void do_object(oop o) { | |
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|
2826 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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|
2827 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2828 bool print_it = _all || over_tams || marked; |
2829 | |
2830 if (print_it) { | |
2831 _out->print_cr(" "PTR_FORMAT"%s", | |
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|
2832 p2i((void *)o), (over_tams) ? " >" : (marked) ? " M" : ""); |
3772
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|
2833 PrintReachableOopClosure oopCl(_out, _vo, _all); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
2834 o->oop_iterate_no_header(&oopCl); |
1388 | 2835 } |
342 | 2836 } |
2837 }; | |
2838 | |
1388 | 2839 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2840 private: |
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|
2841 G1CollectedHeap* _g1h; |
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diff
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|
2842 outputStream* _out; |
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|
2843 VerifyOption _vo; |
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2844 bool _all; |
342 | 2845 |
2846 public: | |
2847 bool doHeapRegion(HeapRegion* hr) { | |
2848 HeapWord* b = hr->bottom(); | |
2849 HeapWord* e = hr->end(); | |
2850 HeapWord* t = hr->top(); | |
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2851 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2852 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
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2853 "TAMS: " PTR_FORMAT, p2i(b), p2i(e), p2i(t), p2i(p)); |
1388 | 2854 _out->cr(); |
2855 | |
2856 HeapWord* from = b; | |
2857 HeapWord* to = t; | |
2858 | |
2859 if (to > from) { | |
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2860 _out->print_cr("Objects in [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(from), p2i(to)); |
1388 | 2861 _out->cr(); |
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2862 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2863 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2864 _out->cr(); | |
2865 } | |
342 | 2866 |
2867 return false; | |
2868 } | |
2869 | |
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2870 PrintReachableRegionClosure(outputStream* out, |
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2871 VerifyOption vo, |
1388 | 2872 bool all) : |
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2873 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2874 }; |
2875 | |
1388 | 2876 void ConcurrentMark::print_reachable(const char* str, |
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2877 VerifyOption vo, |
1388 | 2878 bool all) { |
2879 gclog_or_tty->cr(); | |
2880 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2881 |
2882 if (G1PrintReachableBaseFile == NULL) { | |
2883 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2884 return; | |
2885 } | |
2886 | |
2887 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2888 (JVM_MAXPATHLEN - 1)) { | |
2889 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2890 return; | |
2891 } | |
2892 | |
2893 char file_name[JVM_MAXPATHLEN]; | |
2894 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2895 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2896 | |
2897 fileStream fout(file_name); | |
2898 if (!fout.is_open()) { | |
2899 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2900 return; | |
2901 } | |
2902 | |
2903 outputStream* out = &fout; | |
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2904 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2905 out->cr(); |
2906 | |
1388 | 2907 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2908 out->cr(); |
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2909 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2910 _g1h->heap_region_iterate(&rcl); |
1044 | 2911 out->cr(); |
2912 | |
2913 gclog_or_tty->print_cr(" done"); | |
1388 | 2914 gclog_or_tty->flush(); |
342 | 2915 } |
2916 | |
1044 | 2917 #endif // PRODUCT |
2918 | |
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2919 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2920 // Note we are overriding the read-only view of the prev map here, via |
2921 // the cast. | |
2922 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2923 } |
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2924 |
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2925 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2926 _nextMarkBitMap->clearRange(mr); |
2927 } | |
2928 | |
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2929 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2930 clearRangePrevBitmap(mr); |
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2931 clearRangeNextBitmap(mr); |
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2932 } |
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2933 |
342 | 2934 HeapRegion* |
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2935 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2936 // "checkpoint" the finger |
2937 HeapWord* finger = _finger; | |
2938 | |
2939 // _heap_end will not change underneath our feet; it only changes at | |
2940 // yield points. | |
2941 while (finger < _heap_end) { | |
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2942 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2943 |
3771 | 2944 // Note on how this code handles humongous regions. In the |
2945 // normal case the finger will reach the start of a "starts | |
2946 // humongous" (SH) region. Its end will either be the end of the | |
2947 // last "continues humongous" (CH) region in the sequence, or the | |
2948 // standard end of the SH region (if the SH is the only region in | |
2949 // the sequence). That way claim_region() will skip over the CH | |
2950 // regions. However, there is a subtle race between a CM thread | |
2951 // executing this method and a mutator thread doing a humongous | |
2952 // object allocation. The two are not mutually exclusive as the CM | |
2953 // thread does not need to hold the Heap_lock when it gets | |
2954 // here. So there is a chance that claim_region() will come across | |
2955 // a free region that's in the progress of becoming a SH or a CH | |
2956 // region. In the former case, it will either | |
2957 // a) Miss the update to the region's end, in which case it will | |
2958 // visit every subsequent CH region, will find their bitmaps | |
2959 // empty, and do nothing, or | |
2960 // b) Will observe the update of the region's end (in which case | |
2961 // it will skip the subsequent CH regions). | |
2962 // If it comes across a region that suddenly becomes CH, the | |
2963 // scenario will be similar to b). So, the race between | |
2964 // claim_region() and a humongous object allocation might force us | |
2965 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2966 // iterations) but it should not introduce and correctness issues. | |
2967 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2968 HeapWord* bottom = curr_region->bottom(); |
2969 HeapWord* end = curr_region->end(); | |
2970 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2971 | |
3771 | 2972 if (verbose_low()) { |
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2973 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2974 "["PTR_FORMAT", "PTR_FORMAT"), " |
2975 "limit = "PTR_FORMAT, | |
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2976 worker_id, p2i(curr_region), p2i(bottom), p2i(end), p2i(limit)); |
3771 | 2977 } |
2978 | |
2979 // Is the gap between reading the finger and doing the CAS too long? | |
2980 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2981 if (res == finger) { |
2982 // we succeeded | |
2983 | |
2984 // notice that _finger == end cannot be guaranteed here since, | |
2985 // someone else might have moved the finger even further | |
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2986 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2987 |
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2988 if (verbose_low()) { |
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2989 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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2990 PTR_FORMAT, worker_id, p2i(curr_region)); |
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2991 } |
342 | 2992 |
2993 if (limit > bottom) { | |
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2994 if (verbose_low()) { |
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2995 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2996 "returning it ", worker_id, p2i(curr_region)); |
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|
2997 } |
342 | 2998 return curr_region; |
2999 } else { | |
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|
3000 assert(limit == bottom, |
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3001 "the region limit should be at bottom"); |
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|
3002 if (verbose_low()) { |
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3003 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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3004 "returning NULL", worker_id, p2i(curr_region)); |
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3005 } |
342 | 3006 // we return NULL and the caller should try calling |
3007 // claim_region() again. | |
3008 return NULL; | |
3009 } | |
3010 } else { | |
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3011 assert(_finger > finger, "the finger should have moved forward"); |
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|
3012 if (verbose_low()) { |
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3013 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 3014 "global finger = "PTR_FORMAT", " |
3015 "our finger = "PTR_FORMAT, | |
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3016 worker_id, p2i(_finger), p2i(finger)); |
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3017 } |
342 | 3018 |
3019 // read it again | |
3020 finger = _finger; | |
3021 } | |
3022 } | |
3023 | |
3024 return NULL; | |
3025 } | |
3026 | |
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3027 #ifndef PRODUCT |
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3028 enum VerifyNoCSetOopsPhase { |
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3029 VerifyNoCSetOopsStack, |
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3030 VerifyNoCSetOopsQueues, |
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3031 VerifyNoCSetOopsSATBCompleted, |
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3032 VerifyNoCSetOopsSATBThread |
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3033 }; |
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3034 |
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3035 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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3036 private: |
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3037 G1CollectedHeap* _g1h; |
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3038 VerifyNoCSetOopsPhase _phase; |
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3039 int _info; |
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3040 |
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3041 const char* phase_str() { |
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3042 switch (_phase) { |
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3043 case VerifyNoCSetOopsStack: return "Stack"; |
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3044 case VerifyNoCSetOopsQueues: return "Queue"; |
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3045 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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3046 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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3047 default: ShouldNotReachHere(); |
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3048 } |
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3049 return NULL; |
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|
3050 } |
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3051 |
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3052 void do_object_work(oop obj) { |
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3053 guarantee(!_g1h->obj_in_cs(obj), |
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3054 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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3055 p2i((void*) obj), phase_str(), _info)); |
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3056 } |
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3057 |
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3058 public: |
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3059 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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3060 |
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3061 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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3062 _phase = phase; |
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3063 _info = info; |
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|
3064 } |
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3065 |
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3066 virtual void do_oop(oop* p) { |
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3067 oop obj = oopDesc::load_decode_heap_oop(p); |
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3068 do_object_work(obj); |
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|
3069 } |
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3070 |
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3071 virtual void do_oop(narrowOop* p) { |
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3072 // We should not come across narrow oops while scanning marking |
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3073 // stacks and SATB buffers. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3074 ShouldNotReachHere(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3075 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3076 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3077 virtual void do_object(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3078 do_object_work(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3079 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3080 }; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3081 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3082 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3083 bool verify_enqueued_buffers, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3084 bool verify_thread_buffers, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3085 bool verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3086 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3087 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3088 return; |
342 | 3089 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
3090 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3091 VerifyNoCSetOopsClosure cl; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3092 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3093 if (verify_stacks) { |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3094 // Verify entries on the global mark stack |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3095 cl.set_phase(VerifyNoCSetOopsStack); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3096 _markStack.oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3097 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3098 // Verify entries on the task queues |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
3099 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3100 cl.set_phase(VerifyNoCSetOopsQueues, i); |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
3101 CMTaskQueue* queue = _task_queues->queue(i); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3102 queue->oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3103 } |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3104 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3105 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3106 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3107 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3108 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3109 if (verify_enqueued_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3110 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3111 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3112 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3113 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3114 // 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
|
3115 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3116 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3117 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
|
3118 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3119 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3120 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3121 // Verify the global finger |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3122 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3123 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
|
3124 // 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
|
3125 // 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
|
3126 // 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
|
3127 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3128 // 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
|
3129 // 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
|
3130 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3131 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
|
3132 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3133 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3134 p2i(global_finger), HR_FORMAT_PARAMS(global_hr))); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3135 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3136 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3137 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3138 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
|
3139 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
|
3140 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3141 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3142 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
|
3143 // 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
|
3144 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
|
3145 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3146 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3147 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3148 p2i(task_finger), HR_FORMAT_PARAMS(task_hr))); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3149 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3150 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3151 } |
342 | 3152 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3153 #endif // PRODUCT |
342 | 3154 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3155 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3156 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3157 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3158 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3159 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3160 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3161 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3162 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3163 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3164 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3165 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3166 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3167 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3168 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3169 _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
|
3170 _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
|
3171 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3172 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3173 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3174 // 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
|
3175 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3176 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3177 // "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
|
3178 // 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
|
3179 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3180 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3181 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3182 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3183 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3184 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3185 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3186 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3187 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3188 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
|
3189 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3190 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3191 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3192 p2i(start), p2i(limit), p2i(hr->top()), p2i(hr->end()))); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3193 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3194 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3195 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3196 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3197 // 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
|
3198 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3199 } |
d30fa85f9994
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parents:
4830
diff
changeset
|
3200 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3201 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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parents:
6750
diff
changeset
|
3202 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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parents:
6750
diff
changeset
|
3203 // '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
|
3204 assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3205 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3206 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3207 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3208 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3209 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3210 // 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
|
3211 // 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
|
3212 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3213 // 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
|
3214 // could be actually just beyond the end of the the heap; |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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parents:
6750
diff
changeset
|
3215 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
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parents:
6750
diff
changeset
|
3216 // that is also outside the heap. |
988bf00cc564
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parents:
6750
diff
changeset
|
3217 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
4836
d30fa85f9994
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parents:
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diff
changeset
|
3218 limit_idx += 1; |
d30fa85f9994
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parents:
4830
diff
changeset
|
3219 } |
d30fa85f9994
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parents:
4830
diff
changeset
|
3220 |
d30fa85f9994
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parents:
4830
diff
changeset
|
3221 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3222 |
d30fa85f9994
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parents:
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diff
changeset
|
3223 // 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
|
3224 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3225 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3226 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3227 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3228 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3229 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
d30fa85f9994
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parents:
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diff
changeset
|
3230 |
d30fa85f9994
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parents:
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diff
changeset
|
3231 // Fetch the marked_bytes in this region for task i and |
d30fa85f9994
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parents:
4830
diff
changeset
|
3232 // add it to the running total for this region. |
d30fa85f9994
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parents:
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diff
changeset
|
3233 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
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parents:
4830
diff
changeset
|
3234 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3235 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3236 // into the global card bitmap. |
d30fa85f9994
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parents:
4830
diff
changeset
|
3237 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
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parents:
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diff
changeset
|
3238 |
d30fa85f9994
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parents:
4830
diff
changeset
|
3239 while (scan_idx < limit_idx) { |
d30fa85f9994
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parents:
4830
diff
changeset
|
3240 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3241 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3242 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3243 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3244 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3245 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3246 // parameter. It does, however, have an early exit if |
4836
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3247 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3248 // passed in for left offset here. |
d30fa85f9994
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parents:
4830
diff
changeset
|
3249 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3250 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
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parents:
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diff
changeset
|
3251 } |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3252 } |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3253 |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3254 // Update the marked bytes for this region. |
d30fa85f9994
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parents:
4830
diff
changeset
|
3255 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3256 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3257 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3258 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3259 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3260 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3261 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3262 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3263 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3264 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3265 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3266 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3267 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3268 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3269 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3270 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3271 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3272 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3273 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3274 uint max_worker_id, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3275 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3276 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3277 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3278 _max_worker_id(max_worker_id), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3279 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3280 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3281 void work(uint worker_id) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3282 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3283 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3284 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3285 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3286 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3287 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3288 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3289 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3290 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3291 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3292 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3293 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3294 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3295 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3296 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3297 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3298 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3299 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3300 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3301 _max_worker_id, n_workers); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3302 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3303 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3304 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3305 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3306 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3307 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3308 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3309 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3310 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3311 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3312 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3313 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3314 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3315 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3316 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3317 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3318 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3319 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3320 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3321 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3322 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3323 _card_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
3324 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
3325 // Clear the global region bitmap - it will be filled as part |
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diff
changeset
|
3326 // of the final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3327 _region_bm.clear(); |
d30fa85f9994
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diff
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|
3328 |
6010
720b6a76dd9d
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changeset
|
3329 uint max_regions = _g1h->max_regions(); |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
3330 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
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|
3331 |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
3332 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
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changeset
|
3333 BitMap* task_card_bm = count_card_bitmap_for(i); |
d30fa85f9994
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|
3334 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
d30fa85f9994
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|
3335 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
3336 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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|
3337 assert(marked_bytes_array != NULL, "uninitialized"); |
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|
3338 |
6010
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diff
changeset
|
3339 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
d30fa85f9994
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|
3340 task_card_bm->clear(); |
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changeset
|
3341 } |
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|
3342 } |
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changeset
|
3343 |
342 | 3344 void ConcurrentMark::print_stats() { |
3345 if (verbose_stats()) { | |
3346 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3347 for (size_t i = 0; i < _active_tasks; ++i) { | |
3348 _tasks[i]->print_stats(); | |
3349 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3350 } | |
3351 } | |
3352 } | |
3353 | |
3354 // abandon current marking iteration due to a Full GC | |
3355 void ConcurrentMark::abort() { | |
3356 // Clear all marks to force marking thread to do nothing | |
3357 _nextMarkBitMap->clearAll(); | |
4836
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|
3358 // Clear the liveness counting data |
d30fa85f9994
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changeset
|
3359 clear_all_count_data(); |
342 | 3360 // Empty mark stack |
7450
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|
3361 reset_marking_state(); |
6862
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diff
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|
3362 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3363 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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parents:
1833
diff
changeset
|
3364 } |
17949
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
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diff
changeset
|
3365 _first_overflow_barrier_sync.abort(); |
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
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diff
changeset
|
3366 _second_overflow_barrier_sync.abort(); |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
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|
3367 const GCId& gc_id = _g1h->gc_tracer_cm()->gc_id(); |
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|
3368 if (!gc_id.is_undefined()) { |
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|
3369 // We can do multiple full GCs before ConcurrentMarkThread::run() gets a chance |
0982ec23da03
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|
3370 // to detect that it was aborted. Only keep track of the first GC id that we aborted. |
0982ec23da03
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|
3371 _aborted_gc_id = gc_id; |
0982ec23da03
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|
3372 } |
342 | 3373 _has_aborted = true; |
3374 | |
3375 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3376 satb_mq_set.abandon_partial_marking(); | |
1317
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6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3377 // This can be called either during or outside marking, we'll read |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3378 // the expected_active value from the SATB queue set. |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
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1314
diff
changeset
|
3379 satb_mq_set.set_active_all_threads( |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3380 false, /* new active value */ |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3381 satb_mq_set.is_active() /* expected_active */); |
10405 | 3382 |
3383 _g1h->trace_heap_after_concurrent_cycle(); | |
3384 _g1h->register_concurrent_cycle_end(); | |
342 | 3385 } |
3386 | |
20190
0982ec23da03
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|
3387 const GCId& ConcurrentMark::concurrent_gc_id() { |
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|
3388 if (has_aborted()) { |
0982ec23da03
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diff
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|
3389 return _aborted_gc_id; |
0982ec23da03
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brutisso
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diff
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|
3390 } |
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diff
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|
3391 return _g1h->gc_tracer_cm()->gc_id(); |
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|
3392 } |
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|
3393 |
342 | 3394 static void print_ms_time_info(const char* prefix, const char* name, |
3395 NumberSeq& ns) { | |
3396 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3397 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3398 if (ns.num() > 0) { | |
3399 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3400 prefix, ns.sd(), ns.maximum()); | |
3401 } | |
3402 } | |
3403 | |
3404 void ConcurrentMark::print_summary_info() { | |
3405 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3406 print_ms_time_info(" ", "init marks", _init_times); | |
3407 print_ms_time_info(" ", "remarks", _remark_times); | |
3408 { | |
3409 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3410 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3411 | |
3412 } | |
3413 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3414 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3415 _total_counting_time, | |
3416 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3417 (double)_cleanup_times.num() | |
3418 : 0.0)); | |
3419 if (G1ScrubRemSets) { | |
3420 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3421 _total_rs_scrub_time, | |
3422 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3423 (double)_cleanup_times.num() | |
3424 : 0.0)); | |
3425 } | |
3426 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3427 (_init_times.sum() + _remark_times.sum() + | |
3428 _cleanup_times.sum())/1000.0); | |
3429 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
4836
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diff
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|
3430 "(%8.2f s marking).", |
342 | 3431 cmThread()->vtime_accum(), |
4836
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diff
changeset
|
3432 cmThread()->vtime_mark_accum()); |
342 | 3433 } |
3434 | |
1019 | 3435 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
8008
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
8006
diff
changeset
|
3436 if (use_parallel_marking_threads()) { |
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
8006
diff
changeset
|
3437 _parallel_workers->print_worker_threads_on(st); |
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
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8006
diff
changeset
|
3438 } |
1019 | 3439 } |
3440 | |
9076
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
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diff
changeset
|
3441 void ConcurrentMark::print_on_error(outputStream* st) const { |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3442 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3443 p2i(_prevMarkBitMap), p2i(_nextMarkBitMap)); |
9076
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3444 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3445 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3446 } |
7b835924c31c
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stefank
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8789
diff
changeset
|
3447 |
342 | 3448 // We take a break if someone is trying to stop the world. |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3449 bool ConcurrentMark::do_yield_check(uint worker_id) { |
20192 | 3450 if (SuspendibleThreadSet::should_yield()) { |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3451 if (worker_id == 0) { |
342 | 3452 _g1h->g1_policy()->record_concurrent_pause(); |
3776
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diff
changeset
|
3453 } |
20192 | 3454 SuspendibleThreadSet::yield(); |
342 | 3455 return true; |
3456 } else { | |
3457 return false; | |
3458 } | |
3459 } | |
3460 | |
3461 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3462 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3463 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3464 } | |
3465 | |
3466 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3467 void* last) { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
3468 return containing_card_is_marked(start) && |
23d434c6290d
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tonyp
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3772
diff
changeset
|
3469 containing_card_is_marked(last); |
342 | 3470 } |
3471 | |
3472 #ifndef PRODUCT | |
3473 // for debugging purposes | |
3474 void ConcurrentMark::print_finger() { | |
3475 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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diff
changeset
|
3476 p2i(_heap_start), p2i(_heap_end), p2i(_finger)); |
6862
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diff
changeset
|
3477 for (uint i = 0; i < _max_worker_id; ++i) { |
17937
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drchase
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diff
changeset
|
3478 gclog_or_tty->print(" %u: " PTR_FORMAT, i, p2i(_tasks[i]->finger())); |
342 | 3479 } |
17937
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17844
diff
changeset
|
3480 gclog_or_tty->cr(); |
342 | 3481 } |
3482 #endif | |
3483 | |
3771 | 3484 void CMTask::scan_object(oop obj) { |
3485 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3486 | |
3487 if (_cm->verbose_high()) { | |
6862
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diff
changeset
|
3488 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
17937
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drchase
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diff
changeset
|
3489 _worker_id, p2i((void*) obj)); |
3771 | 3490 } |
3491 | |
3492 size_t obj_size = obj->size(); | |
3493 _words_scanned += obj_size; | |
3494 | |
3495 obj->oop_iterate(_cm_oop_closure); | |
3496 statsOnly( ++_objs_scanned ); | |
3497 check_limits(); | |
3498 } | |
3499 | |
342 | 3500 // Closure for iteration over bitmaps |
3501 class CMBitMapClosure : public BitMapClosure { | |
3502 private: | |
3503 // the bitmap that is being iterated over | |
3504 CMBitMap* _nextMarkBitMap; | |
3505 ConcurrentMark* _cm; | |
3506 CMTask* _task; | |
3507 | |
3508 public: | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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4837
diff
changeset
|
3509 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
2a0172480595
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changeset
|
3510 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3511 |
3512 bool do_bit(size_t offset) { | |
3513 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
1023
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|
3514 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
3515 assert( addr < _cm->finger(), "invariant"); |
342 | 3516 |
5988
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4837
diff
changeset
|
3517 statsOnly( _task->increase_objs_found_on_bitmap() ); |
2a0172480595
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4837
diff
changeset
|
3518 assert(addr >= _task->finger(), "invariant"); |
2a0172480595
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4837
diff
changeset
|
3519 |
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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4837
diff
changeset
|
3520 // We move that task's local finger along. |
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4837
diff
changeset
|
3521 _task->move_finger_to(addr); |
342 | 3522 |
3523 _task->scan_object(oop(addr)); | |
3524 // we only partially drain the local queue and global stack | |
3525 _task->drain_local_queue(true); | |
3526 _task->drain_global_stack(true); | |
3527 | |
3528 // if the has_aborted flag has been raised, we need to bail out of | |
3529 // the iteration | |
3530 return !_task->has_aborted(); | |
3531 } | |
3532 }; | |
3533 | |
3771 | 3534 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3535 ConcurrentMark* cm, | |
3536 CMTask* task) | |
3537 : _g1h(g1h), _cm(cm), _task(task) { | |
3538 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3539 | |
3540 if (G1UseConcMarkReferenceProcessing) { | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3977
diff
changeset
|
3541 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3542 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3543 } |
3771 | 3544 } |
342 | 3545 |
3546 void CMTask::setup_for_region(HeapRegion* hr) { | |
1023
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diff
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|
3547 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
changeset
|
3548 assert(hr != NULL, |
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1022
diff
changeset
|
3549 "claim_region() should have filtered out continues humongous regions"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
3550 assert(!hr->continuesHumongous(), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
changeset
|
3551 "claim_region() should have filtered out continues humongous regions"); |
342 | 3552 |
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diff
changeset
|
3553 if (_cm->verbose_low()) { |
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8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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3554 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3555 _worker_id, p2i(hr)); |
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3556 } |
342 | 3557 |
3558 _curr_region = hr; | |
3559 _finger = hr->bottom(); | |
3560 update_region_limit(); | |
3561 } | |
3562 | |
3563 void CMTask::update_region_limit() { | |
3564 HeapRegion* hr = _curr_region; | |
3565 HeapWord* bottom = hr->bottom(); | |
3566 HeapWord* limit = hr->next_top_at_mark_start(); | |
3567 | |
3568 if (limit == bottom) { | |
3776
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3569 if (_cm->verbose_low()) { |
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3570 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3571 "["PTR_FORMAT", "PTR_FORMAT")", |
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3572 _worker_id, p2i(bottom), p2i(limit)); |
3776
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3573 } |
342 | 3574 // The region was collected underneath our feet. |
3575 // We set the finger to bottom to ensure that the bitmap | |
3576 // iteration that will follow this will not do anything. | |
3577 // (this is not a condition that holds when we set the region up, | |
3578 // as the region is not supposed to be empty in the first place) | |
3579 _finger = bottom; | |
3580 } else if (limit >= _region_limit) { | |
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3581 assert(limit >= _finger, "peace of mind"); |
342 | 3582 } else { |
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3583 assert(limit < _region_limit, "only way to get here"); |
342 | 3584 // This can happen under some pretty unusual circumstances. An |
3585 // evacuation pause empties the region underneath our feet (NTAMS | |
3586 // at bottom). We then do some allocation in the region (NTAMS | |
3587 // stays at bottom), followed by the region being used as a GC | |
3588 // alloc region (NTAMS will move to top() and the objects | |
3589 // originally below it will be grayed). All objects now marked in | |
3590 // the region are explicitly grayed, if below the global finger, | |
3591 // and we do not need in fact to scan anything else. So, we simply | |
3592 // set _finger to be limit to ensure that the bitmap iteration | |
3593 // doesn't do anything. | |
3594 _finger = limit; | |
3595 } | |
3596 | |
3597 _region_limit = limit; | |
3598 } | |
3599 | |
3600 void CMTask::giveup_current_region() { | |
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3601 assert(_curr_region != NULL, "invariant"); |
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3602 if (_cm->verbose_low()) { |
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3603 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3604 _worker_id, p2i(_curr_region)); |
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3605 } |
342 | 3606 clear_region_fields(); |
3607 } | |
3608 | |
3609 void CMTask::clear_region_fields() { | |
3610 // Values for these three fields that indicate that we're not | |
3611 // holding on to a region. | |
3612 _curr_region = NULL; | |
3613 _finger = NULL; | |
3614 _region_limit = NULL; | |
3615 } | |
3616 | |
3771 | 3617 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3618 if (cm_oop_closure == NULL) { | |
3619 assert(_cm_oop_closure != NULL, "invariant"); | |
3620 } else { | |
3621 assert(_cm_oop_closure == NULL, "invariant"); | |
3622 } | |
3623 _cm_oop_closure = cm_oop_closure; | |
3624 } | |
3625 | |
342 | 3626 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3627 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3628 |
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3629 if (_cm->verbose_low()) { |
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3630 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3631 } |
342 | 3632 |
3633 _nextMarkBitMap = nextMarkBitMap; | |
3634 clear_region_fields(); | |
3635 | |
3636 _calls = 0; | |
3637 _elapsed_time_ms = 0.0; | |
3638 _termination_time_ms = 0.0; | |
3639 _termination_start_time_ms = 0.0; | |
3640 | |
3641 #if _MARKING_STATS_ | |
3642 _local_pushes = 0; | |
3643 _local_pops = 0; | |
3644 _local_max_size = 0; | |
3645 _objs_scanned = 0; | |
3646 _global_pushes = 0; | |
3647 _global_pops = 0; | |
3648 _global_max_size = 0; | |
3649 _global_transfers_to = 0; | |
3650 _global_transfers_from = 0; | |
3651 _regions_claimed = 0; | |
3652 _objs_found_on_bitmap = 0; | |
3653 _satb_buffers_processed = 0; | |
3654 _steal_attempts = 0; | |
3655 _steals = 0; | |
3656 _aborted = 0; | |
3657 _aborted_overflow = 0; | |
3658 _aborted_cm_aborted = 0; | |
3659 _aborted_yield = 0; | |
3660 _aborted_timed_out = 0; | |
3661 _aborted_satb = 0; | |
3662 _aborted_termination = 0; | |
3663 #endif // _MARKING_STATS_ | |
3664 } | |
3665 | |
3666 bool CMTask::should_exit_termination() { | |
3667 regular_clock_call(); | |
3668 // This is called when we are in the termination protocol. We should | |
3669 // quit if, for some reason, this task wants to abort or the global | |
3670 // stack is not empty (this means that we can get work from it). | |
3671 return !_cm->mark_stack_empty() || has_aborted(); | |
3672 } | |
3673 | |
3674 void CMTask::reached_limit() { | |
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3675 assert(_words_scanned >= _words_scanned_limit || |
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3676 _refs_reached >= _refs_reached_limit , |
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3677 "shouldn't have been called otherwise"); |
342 | 3678 regular_clock_call(); |
3679 } | |
3680 | |
3681 void CMTask::regular_clock_call() { | |
3776
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3682 if (has_aborted()) return; |
342 | 3683 |
3684 // First, we need to recalculate the words scanned and refs reached | |
3685 // limits for the next clock call. | |
3686 recalculate_limits(); | |
3687 | |
3688 // During the regular clock call we do the following | |
3689 | |
3690 // (1) If an overflow has been flagged, then we abort. | |
3691 if (_cm->has_overflown()) { | |
3692 set_has_aborted(); | |
3693 return; | |
3694 } | |
3695 | |
3696 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3697 // to check anything else. The other steps are only needed during | |
3698 // the concurrent marking phase. | |
3776
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3699 if (!concurrent()) return; |
342 | 3700 |
3701 // (2) If marking has been aborted for Full GC, then we also abort. | |
3702 if (_cm->has_aborted()) { | |
3703 set_has_aborted(); | |
3704 statsOnly( ++_aborted_cm_aborted ); | |
3705 return; | |
3706 } | |
3707 | |
3708 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3709 | |
3710 // (3) If marking stats are enabled, then we update the step history. | |
3711 #if _MARKING_STATS_ | |
3776
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3712 if (_words_scanned >= _words_scanned_limit) { |
342 | 3713 ++_clock_due_to_scanning; |
3776
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3714 } |
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3715 if (_refs_reached >= _refs_reached_limit) { |
342 | 3716 ++_clock_due_to_marking; |
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3717 } |
342 | 3718 |
3719 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3720 _interval_start_time_ms = curr_time_ms; | |
3721 _all_clock_intervals_ms.add(last_interval_ms); | |
3722 | |
3723 if (_cm->verbose_medium()) { | |
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3724 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
3776
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3725 "scanned = %d%s, refs reached = %d%s", |
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3726 _worker_id, last_interval_ms, |
3776
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3727 _words_scanned, |
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3728 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3729 _refs_reached, |
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3730 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3731 } |
3732 #endif // _MARKING_STATS_ | |
3733 | |
3734 // (4) We check whether we should yield. If we have to, then we abort. | |
20192 | 3735 if (SuspendibleThreadSet::should_yield()) { |
342 | 3736 // We should yield. To do this we abort the task. The caller is |
3737 // responsible for yielding. | |
3738 set_has_aborted(); | |
3739 statsOnly( ++_aborted_yield ); | |
3740 return; | |
3741 } | |
3742 | |
3743 // (5) We check whether we've reached our time quota. If we have, | |
3744 // then we abort. | |
3745 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3746 if (elapsed_time_ms > _time_target_ms) { | |
3747 set_has_aborted(); | |
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3748 _has_timed_out = true; |
342 | 3749 statsOnly( ++_aborted_timed_out ); |
3750 return; | |
3751 } | |
3752 | |
3753 // (6) Finally, we check whether there are enough completed STAB | |
3754 // buffers available for processing. If there are, we abort. | |
3755 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3756 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3776
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3757 if (_cm->verbose_low()) { |
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3758 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3759 _worker_id); |
3776
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3760 } |
342 | 3761 // we do need to process SATB buffers, we'll abort and restart |
3762 // the marking task to do so | |
3763 set_has_aborted(); | |
3764 statsOnly( ++_aborted_satb ); | |
3765 return; | |
3766 } | |
3767 } | |
3768 | |
3769 void CMTask::recalculate_limits() { | |
3770 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3771 _words_scanned_limit = _real_words_scanned_limit; | |
3772 | |
3773 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3774 _refs_reached_limit = _real_refs_reached_limit; | |
3775 } | |
3776 | |
3777 void CMTask::decrease_limits() { | |
3778 // This is called when we believe that we're going to do an infrequent | |
3779 // operation which will increase the per byte scanned cost (i.e. move | |
3780 // entries to/from the global stack). It basically tries to decrease the | |
3781 // scanning limit so that the clock is called earlier. | |
3782 | |
3776
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3783 if (_cm->verbose_medium()) { |
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3784 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
3776
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3785 } |
342 | 3786 |
3787 _words_scanned_limit = _real_words_scanned_limit - | |
3788 3 * words_scanned_period / 4; | |
3789 _refs_reached_limit = _real_refs_reached_limit - | |
3790 3 * refs_reached_period / 4; | |
3791 } | |
3792 | |
3793 void CMTask::move_entries_to_global_stack() { | |
3794 // local array where we'll store the entries that will be popped | |
3795 // from the local queue | |
3796 oop buffer[global_stack_transfer_size]; | |
3797 | |
3798 int n = 0; | |
3799 oop obj; | |
3800 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3801 buffer[n] = obj; | |
3802 ++n; | |
3803 } | |
3804 | |
3805 if (n > 0) { | |
3806 // we popped at least one entry from the local queue | |
3807 | |
3808 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3809 | |
3810 if (!_cm->mark_stack_push(buffer, n)) { | |
3776
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3811 if (_cm->verbose_low()) { |
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3812 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3813 _worker_id); |
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3814 } |
342 | 3815 set_has_aborted(); |
3816 } else { | |
3817 // the transfer was successful | |
3818 | |
3776
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3819 if (_cm->verbose_medium()) { |
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3820 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3821 _worker_id, n); |
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3822 } |
342 | 3823 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3824 if (tmp_size > _global_max_size) { |
342 | 3825 _global_max_size = tmp_size; |
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3826 } |
342 | 3827 _global_pushes += n ); |
3828 } | |
3829 } | |
3830 | |
3831 // this operation was quite expensive, so decrease the limits | |
3832 decrease_limits(); | |
3833 } | |
3834 | |
3835 void CMTask::get_entries_from_global_stack() { | |
3836 // local array where we'll store the entries that will be popped | |
3837 // from the global stack. | |
3838 oop buffer[global_stack_transfer_size]; | |
3839 int n; | |
3840 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3841 assert(n <= global_stack_transfer_size, |
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3842 "we should not pop more than the given limit"); |
342 | 3843 if (n > 0) { |
3844 // yes, we did actually pop at least one entry | |
3845 | |
3846 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3847 if (_cm->verbose_medium()) { |
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3848 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3849 _worker_id, n); |
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3850 } |
342 | 3851 for (int i = 0; i < n; ++i) { |
3852 bool success = _task_queue->push(buffer[i]); | |
3853 // We only call this when the local queue is empty or under a | |
3854 // given target limit. So, we do not expect this push to fail. | |
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3855 assert(success, "invariant"); |
342 | 3856 } |
3857 | |
3858 statsOnly( int tmp_size = _task_queue->size(); | |
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3859 if (tmp_size > _local_max_size) { |
342 | 3860 _local_max_size = tmp_size; |
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3861 } |
342 | 3862 _local_pushes += n ); |
3863 } | |
3864 | |
3865 // this operation was quite expensive, so decrease the limits | |
3866 decrease_limits(); | |
3867 } | |
3868 | |
3869 void CMTask::drain_local_queue(bool partially) { | |
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3870 if (has_aborted()) return; |
342 | 3871 |
3872 // Decide what the target size is, depending whether we're going to | |
3873 // drain it partially (so that other tasks can steal if they run out | |
3874 // of things to do) or totally (at the very end). | |
3875 size_t target_size; | |
3776
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3876 if (partially) { |
342 | 3877 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3878 } else { |
342 | 3879 target_size = 0; |
3776
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3880 } |
342 | 3881 |
3882 if (_task_queue->size() > target_size) { | |
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3883 if (_cm->verbose_high()) { |
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3884 gclog_or_tty->print_cr("[%u] draining local queue, target size = " SIZE_FORMAT, |
6862
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3885 _worker_id, target_size); |
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3886 } |
342 | 3887 |
3888 oop obj; | |
3889 bool ret = _task_queue->pop_local(obj); | |
3890 while (ret) { | |
3891 statsOnly( ++_local_pops ); | |
3892 | |
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3893 if (_cm->verbose_high()) { |
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3894 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
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3895 p2i((void*) obj)); |
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3896 } |
342 | 3897 |
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3898 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3899 assert(!_g1h->is_on_master_free_list( |
2152 | 3900 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3901 |
3902 scan_object(obj); | |
3903 | |
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3904 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3905 ret = false; |
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3906 } else { |
342 | 3907 ret = _task_queue->pop_local(obj); |
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3908 } |
342 | 3909 } |
3910 | |
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3911 if (_cm->verbose_high()) { |
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3912 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3913 _worker_id, _task_queue->size()); |
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3914 } |
342 | 3915 } |
3916 } | |
3917 | |
3918 void CMTask::drain_global_stack(bool partially) { | |
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3919 if (has_aborted()) return; |
342 | 3920 |
3921 // We have a policy to drain the local queue before we attempt to | |
3922 // drain the global stack. | |
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3923 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3924 |
3925 // Decide what the target size is, depending whether we're going to | |
3926 // drain it partially (so that other tasks can steal if they run out | |
3927 // of things to do) or totally (at the very end). Notice that, | |
3928 // because we move entries from the global stack in chunks or | |
3929 // because another task might be doing the same, we might in fact | |
3930 // drop below the target. But, this is not a problem. | |
3931 size_t target_size; | |
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3932 if (partially) { |
342 | 3933 target_size = _cm->partial_mark_stack_size_target(); |
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3934 } else { |
342 | 3935 target_size = 0; |
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3936 } |
342 | 3937 |
3938 if (_cm->mark_stack_size() > target_size) { | |
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3939 if (_cm->verbose_low()) { |
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3940 gclog_or_tty->print_cr("[%u] draining global_stack, target size " SIZE_FORMAT, |
6862
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3941 _worker_id, target_size); |
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3942 } |
342 | 3943 |
3944 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3945 get_entries_from_global_stack(); | |
3946 drain_local_queue(partially); | |
3947 } | |
3948 | |
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3949 if (_cm->verbose_low()) { |
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3950 gclog_or_tty->print_cr("[%u] drained global stack, size = " SIZE_FORMAT, |
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3951 _worker_id, _cm->mark_stack_size()); |
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3952 } |
342 | 3953 } |
3954 } | |
3955 | |
3956 // SATB Queue has several assumptions on whether to call the par or | |
3957 // non-par versions of the methods. this is why some of the code is | |
3958 // replicated. We should really get rid of the single-threaded version | |
3959 // of the code to simplify things. | |
3960 void CMTask::drain_satb_buffers() { | |
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3961 if (has_aborted()) return; |
342 | 3962 |
3963 // We set this so that the regular clock knows that we're in the | |
3964 // middle of draining buffers and doesn't set the abort flag when it | |
3965 // notices that SATB buffers are available for draining. It'd be | |
3966 // very counter productive if it did that. :-) | |
3967 _draining_satb_buffers = true; | |
3968 | |
3969 CMObjectClosure oc(this); | |
3970 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3971 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3972 satb_mq_set.set_par_closure(_worker_id, &oc); |
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3973 } else { |
342 | 3974 satb_mq_set.set_closure(&oc); |
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3975 } |
342 | 3976 |
3977 // This keeps claiming and applying the closure to completed buffers | |
3978 // until we run out of buffers or we need to abort. | |
1833
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3979 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3980 while (!has_aborted() && |
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3981 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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3982 if (_cm->verbose_medium()) { |
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3983 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3984 } |
342 | 3985 statsOnly( ++_satb_buffers_processed ); |
3986 regular_clock_call(); | |
3987 } | |
3988 } else { | |
3989 while (!has_aborted() && | |
3990 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3991 if (_cm->verbose_medium()) { |
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3992 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3993 } |
342 | 3994 statsOnly( ++_satb_buffers_processed ); |
3995 regular_clock_call(); | |
3996 } | |
3997 } | |
3998 | |
3999 _draining_satb_buffers = false; | |
4000 | |
1023
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4001 assert(has_aborted() || |
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4002 concurrent() || |
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4003 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 4004 |
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4005 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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4006 satb_mq_set.set_par_closure(_worker_id, NULL); |
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4007 } else { |
342 | 4008 satb_mq_set.set_closure(NULL); |
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4009 } |
342 | 4010 |
4011 // again, this was a potentially expensive operation, decrease the | |
4012 // limits to get the regular clock call early | |
4013 decrease_limits(); | |
4014 } | |
4015 | |
4016 void CMTask::print_stats() { | |
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4017 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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4018 _worker_id, _calls); |
342 | 4019 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
4020 _elapsed_time_ms, _termination_time_ms); | |
4021 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4022 _step_times_ms.num(), _step_times_ms.avg(), | |
4023 _step_times_ms.sd()); | |
4024 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4025 _step_times_ms.maximum(), _step_times_ms.sum()); | |
4026 | |
4027 #if _MARKING_STATS_ | |
4028 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4029 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
4030 _all_clock_intervals_ms.sd()); | |
4031 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4032 _all_clock_intervals_ms.maximum(), | |
4033 _all_clock_intervals_ms.sum()); | |
4034 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
4035 _clock_due_to_scanning, _clock_due_to_marking); | |
4036 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
4037 _objs_scanned, _objs_found_on_bitmap); | |
4038 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
4039 _local_pushes, _local_pops, _local_max_size); | |
4040 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
4041 _global_pushes, _global_pops, _global_max_size); | |
4042 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
4043 _global_transfers_to,_global_transfers_from); | |
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4044 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 4045 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
4046 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
4047 _steal_attempts, _steals); | |
4048 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
4049 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
4050 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
4051 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
4052 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
4053 #endif // _MARKING_STATS_ | |
4054 } | |
4055 | |
4056 /***************************************************************************** | |
4057 | |
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4058 The do_marking_step(time_target_ms, ...) method is the building |
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4059 block of the parallel marking framework. It can be called in parallel |
342 | 4060 with other invocations of do_marking_step() on different tasks |
4061 (but only one per task, obviously) and concurrently with the | |
4062 mutator threads, or during remark, hence it eliminates the need | |
4063 for two versions of the code. When called during remark, it will | |
4064 pick up from where the task left off during the concurrent marking | |
4065 phase. Interestingly, tasks are also claimable during evacuation | |
4066 pauses too, since do_marking_step() ensures that it aborts before | |
4067 it needs to yield. | |
4068 | |
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4069 The data structures that it uses to do marking work are the |
342 | 4070 following: |
4071 | |
4072 (1) Marking Bitmap. If there are gray objects that appear only | |
4073 on the bitmap (this happens either when dealing with an overflow | |
4074 or when the initial marking phase has simply marked the roots | |
4075 and didn't push them on the stack), then tasks claim heap | |
4076 regions whose bitmap they then scan to find gray objects. A | |
4077 global finger indicates where the end of the last claimed region | |
4078 is. A local finger indicates how far into the region a task has | |
4079 scanned. The two fingers are used to determine how to gray an | |
4080 object (i.e. whether simply marking it is OK, as it will be | |
4081 visited by a task in the future, or whether it needs to be also | |
4082 pushed on a stack). | |
4083 | |
4084 (2) Local Queue. The local queue of the task which is accessed | |
4085 reasonably efficiently by the task. Other tasks can steal from | |
4086 it when they run out of work. Throughout the marking phase, a | |
4087 task attempts to keep its local queue short but not totally | |
4088 empty, so that entries are available for stealing by other | |
4089 tasks. Only when there is no more work, a task will totally | |
4090 drain its local queue. | |
4091 | |
4092 (3) Global Mark Stack. This handles local queue overflow. During | |
4093 marking only sets of entries are moved between it and the local | |
4094 queues, as access to it requires a mutex and more fine-grain | |
4095 interaction with it which might cause contention. If it | |
4096 overflows, then the marking phase should restart and iterate | |
4097 over the bitmap to identify gray objects. Throughout the marking | |
4098 phase, tasks attempt to keep the global mark stack at a small | |
4099 length but not totally empty, so that entries are available for | |
4100 popping by other tasks. Only when there is no more work, tasks | |
4101 will totally drain the global mark stack. | |
4102 | |
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4103 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 4104 made available. Buffers are regularly removed from this queue |
4105 and scanned for roots, so that the queue doesn't get too | |
4106 long. During remark, all completed buffers are processed, as | |
4107 well as the filled in parts of any uncompleted buffers. | |
4108 | |
4109 The do_marking_step() method tries to abort when the time target | |
4110 has been reached. There are a few other cases when the | |
4111 do_marking_step() method also aborts: | |
4112 | |
4113 (1) When the marking phase has been aborted (after a Full GC). | |
4114 | |
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4115 (2) When a global overflow (on the global stack) has been |
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4116 triggered. Before the task aborts, it will actually sync up with |
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4117 the other tasks to ensure that all the marking data structures |
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4118 (local queues, stacks, fingers etc.) are re-initialized so that |
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4119 when do_marking_step() completes, the marking phase can |
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4120 immediately restart. |
342 | 4121 |
4122 (3) When enough completed SATB buffers are available. The | |
4123 do_marking_step() method only tries to drain SATB buffers right | |
4124 at the beginning. So, if enough buffers are available, the | |
4125 marking step aborts and the SATB buffers are processed at | |
4126 the beginning of the next invocation. | |
4127 | |
4128 (4) To yield. when we have to yield then we abort and yield | |
4129 right at the end of do_marking_step(). This saves us from a lot | |
4130 of hassle as, by yielding we might allow a Full GC. If this | |
4131 happens then objects will be compacted underneath our feet, the | |
4132 heap might shrink, etc. We save checking for this by just | |
4133 aborting and doing the yield right at the end. | |
4134 | |
4135 From the above it follows that the do_marking_step() method should | |
4136 be called in a loop (or, otherwise, regularly) until it completes. | |
4137 | |
4138 If a marking step completes without its has_aborted() flag being | |
4139 true, it means it has completed the current marking phase (and | |
4140 also all other marking tasks have done so and have all synced up). | |
4141 | |
4142 A method called regular_clock_call() is invoked "regularly" (in | |
4143 sub ms intervals) throughout marking. It is this clock method that | |
4144 checks all the abort conditions which were mentioned above and | |
4145 decides when the task should abort. A work-based scheme is used to | |
4146 trigger this clock method: when the number of object words the | |
4147 marking phase has scanned or the number of references the marking | |
4148 phase has visited reach a given limit. Additional invocations to | |
4149 the method clock have been planted in a few other strategic places | |
4150 too. The initial reason for the clock method was to avoid calling | |
4151 vtime too regularly, as it is quite expensive. So, once it was in | |
4152 place, it was natural to piggy-back all the other conditions on it | |
4153 too and not constantly check them throughout the code. | |
4154 | |
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4155 If do_termination is true then do_marking_step will enter its |
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4156 termination protocol. |
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4157 |
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4158 The value of is_serial must be true when do_marking_step is being |
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4159 called serially (i.e. by the VMThread) and do_marking_step should |
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4160 skip any synchronization in the termination and overflow code. |
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|
4161 Examples include the serial remark code and the serial reference |
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|
4162 processing closures. |
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|
4163 |
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4164 The value of is_serial must be false when do_marking_step is |
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|
4165 being called by any of the worker threads in a work gang. |
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4166 Examples include the concurrent marking code (CMMarkingTask), |
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|
4167 the MT remark code, and the MT reference processing closures. |
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4168 |
342 | 4169 *****************************************************************************/ |
4170 | |
2174
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4171 void CMTask::do_marking_step(double time_target_ms, |
8787
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4172 bool do_termination, |
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4173 bool is_serial) { |
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4174 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4175 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4176 |
342 | 4177 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
1023
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4178 assert(_task_queues != NULL, "invariant"); |
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4179 assert(_task_queue != NULL, "invariant"); |
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4180 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4181 |
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4182 assert(!_claimed, |
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4183 "only one thread should claim this task at any one time"); |
342 | 4184 |
4185 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4186 // possible for two threads to set the _claimed flag at the same | |
4187 // time. But it is only for debugging purposes anyway and it will | |
4188 // catch most problems. | |
4189 _claimed = true; | |
4190 | |
4191 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4192 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4193 | |
8787
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4194 // If do_stealing is true then do_marking_step will attempt to |
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4195 // steal work from the other CMTasks. It only makes sense to |
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4196 // enable stealing when the termination protocol is enabled |
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4197 // and do_marking_step() is not being called serially. |
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4198 bool do_stealing = do_termination && !is_serial; |
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4199 |
342 | 4200 double diff_prediction_ms = |
4201 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4202 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4203 | |
4204 // set up the variables that are used in the work-based scheme to | |
4205 // call the regular clock method | |
4206 _words_scanned = 0; | |
4207 _refs_reached = 0; | |
4208 recalculate_limits(); | |
4209 | |
4210 // clear all flags | |
4211 clear_has_aborted(); | |
2174
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4212 _has_timed_out = false; |
342 | 4213 _draining_satb_buffers = false; |
4214 | |
4215 ++_calls; | |
4216 | |
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4217 if (_cm->verbose_low()) { |
6862
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|
4218 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4219 "target = %1.2lfms >>>>>>>>>>", |
6862
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4220 _worker_id, _calls, _time_target_ms); |
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4221 } |
342 | 4222 |
4223 // Set up the bitmap and oop closures. Anything that uses them is | |
4224 // eventually called from this method, so it is OK to allocate these | |
4225 // statically. | |
4226 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4227 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4228 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4229 |
4230 if (_cm->has_overflown()) { | |
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4231 // This can happen if the mark stack overflows during a GC pause |
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4232 // and this task, after a yield point, restarts. We have to abort |
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4233 // as we need to get into the overflow protocol which happens |
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|
4234 // right at the end of this task. |
342 | 4235 set_has_aborted(); |
4236 } | |
4237 | |
4238 // First drain any available SATB buffers. After this, we will not | |
4239 // look at SATB buffers before the next invocation of this method. | |
4240 // If enough completed SATB buffers are queued up, the regular clock | |
4241 // will abort this task so that it restarts. | |
4242 drain_satb_buffers(); | |
4243 // ...then partially drain the local queue and the global stack | |
4244 drain_local_queue(true); | |
4245 drain_global_stack(true); | |
4246 | |
4247 do { | |
4248 if (!has_aborted() && _curr_region != NULL) { | |
4249 // This means that we're already holding on to a region. | |
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4250 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4251 "should not be NULL either"); |
342 | 4252 |
4253 // We might have restarted this task after an evacuation pause | |
4254 // which might have evacuated the region we're holding on to | |
4255 // underneath our feet. Let's read its limit again to make sure | |
4256 // that we do not iterate over a region of the heap that | |
4257 // contains garbage (update_region_limit() will also move | |
4258 // _finger to the start of the region if it is found empty). | |
4259 update_region_limit(); | |
4260 // We will start from _finger not from the start of the region, | |
4261 // as we might be restarting this task after aborting half-way | |
4262 // through scanning this region. In this case, _finger points to | |
4263 // the address where we last found a marked object. If this is a | |
4264 // fresh region, _finger points to start(). | |
4265 MemRegion mr = MemRegion(_finger, _region_limit); | |
4266 | |
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4267 if (_cm->verbose_low()) { |
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4268 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4269 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4270 "of region "HR_FORMAT, |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
4271 _worker_id, p2i(_finger), p2i(_region_limit), |
8039
5e401ef52ec0
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|
4272 HR_FORMAT_PARAMS(_curr_region)); |
3776
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|
4273 } |
342 | 4274 |
8039
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|
4275 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
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|
4276 "humongous regions should go around loop once only"); |
5e401ef52ec0
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|
4277 |
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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|
4278 // Some special cases: |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4279 // 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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|
4280 // If the current region is humongous then we only need to check |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4281 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4282 // scan the object if it's live, and give up the region. |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4283 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4284 // that is left. |
8034
bce1ac447f6b
7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
johnc
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8014
diff
changeset
|
4285 // 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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|
4286 if (mr.is_empty()) { |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4287 giveup_current_region(); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4288 regular_clock_call(); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4289 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
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|
4290 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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|
4291 // The object is marked - apply the closure |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4292 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4293 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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|
4294 } |
5e401ef52ec0
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|
4295 // Even if this task aborted while scanning the humongous object |
5e401ef52ec0
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|
4296 // we can (and should) give up the current region. |
5e401ef52ec0
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|
4297 giveup_current_region(); |
5e401ef52ec0
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|
4298 regular_clock_call(); |
5e401ef52ec0
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|
4299 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4300 giveup_current_region(); |
4301 regular_clock_call(); | |
4302 } else { | |
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|
4303 assert(has_aborted(), "currently the only way to do so"); |
342 | 4304 // The only way to abort the bitmap iteration is to return |
4305 // false from the do_bit() method. However, inside the | |
4306 // do_bit() method we move the _finger to point to the | |
4307 // object currently being looked at. So, if we bail out, we | |
4308 // have definitely set _finger to something non-null. | |
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|
4309 assert(_finger != NULL, "invariant"); |
342 | 4310 |
4311 // Region iteration was actually aborted. So now _finger | |
4312 // points to the address of the object we last scanned. If we | |
4313 // leave it there, when we restart this task, we will rescan | |
4314 // the object. It is easy to avoid this. We move the finger by | |
4315 // enough to point to the next possible object header (the | |
4316 // bitmap knows by how much we need to move it as it knows its | |
4317 // granularity). | |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
4318 assert(_finger < _region_limit, "invariant"); |
8733
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8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
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|
4319 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
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|
4320 // 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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|
4321 if (new_finger >= _region_limit) { |
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|
4322 giveup_current_region(); |
1314
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|
4323 } else { |
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|
4324 move_finger_to(new_finger); |
1314
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|
4325 } |
342 | 4326 } |
4327 } | |
4328 // At this point we have either completed iterating over the | |
4329 // region we were holding on to, or we have aborted. | |
4330 | |
4331 // We then partially drain the local queue and the global stack. | |
4332 // (Do we really need this?) | |
4333 drain_local_queue(true); | |
4334 drain_global_stack(true); | |
4335 | |
4336 // Read the note on the claim_region() method on why it might | |
4337 // return NULL with potentially more regions available for | |
4338 // claiming and why we have to check out_of_regions() to determine | |
4339 // whether we're done or not. | |
4340 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4341 // We are going to try to claim a new region. We should have | |
4342 // given up on the previous one. | |
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|
4343 // Separated the asserts so that we know which one fires. |
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|
4344 assert(_curr_region == NULL, "invariant"); |
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|
4345 assert(_finger == NULL, "invariant"); |
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|
4346 assert(_region_limit == NULL, "invariant"); |
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|
4347 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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|
4348 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4349 } |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4350 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4351 if (claimed_region != NULL) { |
4352 // Yes, we managed to claim one | |
4353 statsOnly( ++_regions_claimed ); | |
4354 | |
3776
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|
4355 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4356 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4357 "region "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
4358 _worker_id, p2i(claimed_region)); |
3776
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|
4359 } |
342 | 4360 |
4361 setup_for_region(claimed_region); | |
1023
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|
4362 assert(_curr_region == claimed_region, "invariant"); |
342 | 4363 } |
4364 // It is important to call the regular clock here. It might take | |
4365 // a while to claim a region if, for example, we hit a large | |
4366 // block of empty regions. So we need to call the regular clock | |
4367 // method once round the loop to make sure it's called | |
4368 // frequently enough. | |
4369 regular_clock_call(); | |
4370 } | |
4371 | |
4372 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
4373 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4374 "at this point we should be out of regions"); |
342 | 4375 } |
4376 } while ( _curr_region != NULL && !has_aborted()); | |
4377 | |
4378 if (!has_aborted()) { | |
4379 // We cannot check whether the global stack is empty, since other | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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|
4380 // tasks might be pushing objects to it concurrently. |
1023
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|
4381 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4382 "at this point we should be out of regions"); |
342 | 4383 |
3776
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|
4384 if (_cm->verbose_low()) { |
6862
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|
4385 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
23d434c6290d
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|
4386 } |
342 | 4387 |
4388 // Try to reduce the number of available SATB buffers so that | |
4389 // remark has less work to do. | |
4390 drain_satb_buffers(); | |
4391 } | |
4392 | |
4393 // Since we've done everything else, we can now totally drain the | |
4394 // local queue and global stack. | |
4395 drain_local_queue(false); | |
4396 drain_global_stack(false); | |
4397 | |
4398 // Attempt at work stealing from other task's queues. | |
2174
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|
4399 if (do_stealing && !has_aborted()) { |
342 | 4400 // We have not aborted. This means that we have finished all that |
4401 // we could. Let's try to do some stealing... | |
4402 | |
4403 // We cannot check whether the global stack is empty, since other | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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|
4404 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
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tonyp
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1022
diff
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|
4405 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4406 "only way to reach here"); |
342 | 4407 |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4408 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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|
4409 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
23d434c6290d
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|
4410 } |
342 | 4411 |
4412 while (!has_aborted()) { | |
4413 oop obj; | |
4414 statsOnly( ++_steal_attempts ); | |
4415 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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|
4416 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
23d434c6290d
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|
4417 if (_cm->verbose_medium()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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|
4418 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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|
4419 _worker_id, p2i((void*) obj)); |
3776
23d434c6290d
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|
4420 } |
342 | 4421 |
4422 statsOnly( ++_steals ); | |
4423 | |
1023
11d4857fe5e1
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|
4424 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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|
4425 "any stolen object should be marked"); |
342 | 4426 scan_object(obj); |
4427 | |
4428 // And since we're towards the end, let's totally drain the | |
4429 // local queue and global stack. | |
4430 drain_local_queue(false); | |
4431 drain_global_stack(false); | |
4432 } else { | |
4433 break; | |
4434 } | |
4435 } | |
4436 } | |
4437 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4438 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4439 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4440 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4441 if (_cm->force_overflow()->should_force()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4442 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4443 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
|
4444 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4445 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
4446 |
342 | 4447 // We still haven't aborted. Now, let's try to get into the |
4448 // termination protocol. | |
2174
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2152
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|
4449 if (do_termination && !has_aborted()) { |
342 | 4450 // We cannot check whether the global stack is empty, since other |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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4837
diff
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|
4451 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
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tonyp
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diff
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|
4452 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
4453 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
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changeset
|
4454 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4455 |
3776
23d434c6290d
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|
4456 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
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|
4457 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
23d434c6290d
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|
4458 } |
342 | 4459 |
4460 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
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|
4461 |
342 | 4462 // The CMTask class also extends the TerminatorTerminator class, |
4463 // hence its should_exit_termination() method will also decide | |
4464 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4465 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4466 _cm->terminator()->offer_termination(this)); |
342 | 4467 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4468 _termination_time_ms += | |
4469 termination_end_time_ms - _termination_start_time_ms; | |
4470 | |
4471 if (finished) { | |
4472 // We're all done. | |
4473 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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|
4474 if (_worker_id == 0) { |
342 | 4475 // let's allow task 0 to do this |
4476 if (concurrent()) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4477 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4478 // we need to set this to false before the next |
4479 // safepoint. This way we ensure that the marking phase | |
4480 // doesn't observe any more heap expansions. | |
4481 _cm->clear_concurrent_marking_in_progress(); | |
4482 } | |
4483 } | |
4484 | |
4485 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4486 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4487 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
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|
4488 // which one. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4489 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4490 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
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diff
changeset
|
4491 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4492 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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1022
diff
changeset
|
4493 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4494 |
3776
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|
4495 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4496 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
23d434c6290d
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diff
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|
4497 } |
342 | 4498 } else { |
4499 // Apparently there's more work to do. Let's abort this task. It | |
4500 // will restart it and we can hopefully find more things to do. | |
4501 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4502 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4503 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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|
4504 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4505 } |
342 | 4506 |
4507 set_has_aborted(); | |
4508 statsOnly( ++_aborted_termination ); | |
4509 } | |
4510 } | |
4511 | |
4512 // Mainly for debugging purposes to make sure that a pointer to the | |
4513 // closure which was statically allocated in this frame doesn't | |
4514 // escape it by accident. | |
3771 | 4515 set_cm_oop_closure(NULL); |
342 | 4516 double end_time_ms = os::elapsedVTime() * 1000.0; |
4517 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4518 // Update the step history. | |
4519 _step_times_ms.add(elapsed_time_ms); | |
4520 | |
4521 if (has_aborted()) { | |
4522 // The task was aborted for some reason. | |
4523 | |
4524 statsOnly( ++_aborted ); | |
4525 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4526 if (_has_timed_out) { |
342 | 4527 double diff_ms = elapsed_time_ms - _time_target_ms; |
4528 // Keep statistics of how well we did with respect to hitting | |
4529 // our target only if we actually timed out (if we aborted for | |
4530 // other reasons, then the results might get skewed). | |
4531 _marking_step_diffs_ms.add(diff_ms); | |
4532 } | |
4533 | |
4534 if (_cm->has_overflown()) { | |
4535 // This is the interesting one. We aborted because a global | |
4536 // overflow was raised. This means we have to restart the | |
4537 // marking phase and start iterating over regions. However, in | |
4538 // order to do this we have to make sure that all tasks stop | |
4539 // what they are doing and re-initialise in a safe manner. We | |
4540 // will achieve this with the use of two barrier sync points. | |
4541 | |
3776
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|
4542 if (_cm->verbose_low()) { |
6862
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|
4543 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
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|
4544 } |
342 | 4545 |
8787
fa08949fe0cb
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8744
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|
4546 if (!is_serial) { |
fa08949fe0cb
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8744
diff
changeset
|
4547 // We only need to enter the sync barrier if being called |
fa08949fe0cb
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8744
diff
changeset
|
4548 // from a parallel context |
fa08949fe0cb
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8744
diff
changeset
|
4549 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
4550 |
fa08949fe0cb
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8744
diff
changeset
|
4551 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
4552 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
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8744
diff
changeset
|
4553 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
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8744
diff
changeset
|
4554 // task 0 will clear the global data structures. |
fa08949fe0cb
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8744
diff
changeset
|
4555 } |
342 | 4556 |
4557 statsOnly( ++_aborted_overflow ); | |
4558 | |
4559 // We clear the local state of this task... | |
4560 clear_region_fields(); | |
4561 | |
8787
fa08949fe0cb
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8744
diff
changeset
|
4562 if (!is_serial) { |
fa08949fe0cb
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8744
diff
changeset
|
4563 // ...and enter the second barrier. |
fa08949fe0cb
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8744
diff
changeset
|
4564 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
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8744
diff
changeset
|
4565 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4566 // At this point, if we're during the concurrent phase of |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
4567 // marking, everything has been re-initialized and we're |
342 | 4568 // ready to restart. |
4569 } | |
4570 | |
4571 if (_cm->verbose_low()) { | |
6862
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|
4572 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4573 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
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|
4574 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
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changeset
|
4575 if (_cm->has_aborted()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
4576 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
4577 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4578 } |
342 | 4579 } |
4580 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4581 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
changeset
|
4582 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4583 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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diff
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|
4584 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
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3772
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|
4585 } |
342 | 4586 } |
4587 | |
4588 _claimed = false; | |
4589 } | |
4590 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4591 CMTask::CMTask(uint worker_id, |
342 | 4592 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
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|
4593 size_t* marked_bytes, |
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6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
4594 BitMap* card_bm, |
342 | 4595 CMTaskQueue* task_queue, |
4596 CMTaskQueueSet* task_queues) | |
4597 : _g1h(G1CollectedHeap::heap()), | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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changeset
|
4598 _worker_id(worker_id), _cm(cm), |
342 | 4599 _claimed(false), |
4600 _nextMarkBitMap(NULL), _hash_seed(17), | |
4601 _task_queue(task_queue), | |
4602 _task_queues(task_queues), | |
3771 | 4603 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
4604 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
4605 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4606 guarantee(task_queue != NULL, "invariant"); |
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1022
diff
changeset
|
4607 guarantee(task_queues != NULL, "invariant"); |
342 | 4608 |
4609 statsOnly( _clock_due_to_scanning = 0; | |
4610 _clock_due_to_marking = 0 ); | |
4611 | |
4612 _marking_step_diffs_ms.add(0.5); | |
4613 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4614 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4615 // These are formatting macros that are used below to ensure |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4616 // consistent formatting. The *_H_* versions are used to format the |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4617 // header for a particular value and they should be kept consistent |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4618 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4619 // the necessary white space (as a prefix) which makes them a bit |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4620 // easier to compose. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4621 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4622 // 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
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|
4623 // identify them easily in a large log file. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4624 #define G1PPRL_LINE_PREFIX "###" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4625 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4626 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4627 #ifdef _LP64 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4628 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4629 #else // _LP64 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4630 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4631 #endif // _LP64 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4632 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4633 // For per-region info |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4634 #define G1PPRL_TYPE_FORMAT " %-4s" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4635 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
4636 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4637 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4638 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4639 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4640 |
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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
|
4641 // For summary info |
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diff
changeset
|
4642 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4643 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4644 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4645 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4646 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4647 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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|
4648 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4649 : _out(out), |
371bbc844bf1
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diff
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|
4650 _total_used_bytes(0), _total_capacity_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4651 _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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|
4652 _hum_used_bytes(0), _hum_capacity_bytes(0), |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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|
4653 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
12080 | 4654 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4655 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4656 MemRegion g1_committed = g1h->g1_committed(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4657 MemRegion g1_reserved = g1h->g1_reserved(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4658 double now = os::elapsedTime(); |
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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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|
4659 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4660 // Print the header of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4661 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4662 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4663 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4664 G1PPRL_SUM_ADDR_FORMAT("committed") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4665 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4666 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4667 p2i(g1_committed.start()), p2i(g1_committed.end()), |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4668 p2i(g1_reserved.start()), p2i(g1_reserved.end()), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4669 HeapRegion::GrainBytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4670 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4671 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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|
4672 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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10186
diff
changeset
|
4673 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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10186
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|
4674 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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10186
diff
changeset
|
4675 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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10186
diff
changeset
|
4676 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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diff
changeset
|
4677 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4678 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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10186
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changeset
|
4679 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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|
4680 "type", "address-range", |
12080 | 4681 "used", "prev-live", "next-live", "gc-eff", |
4682 "remset", "code-roots"); | |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4683 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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|
4684 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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10186
diff
changeset
|
4685 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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diff
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|
4686 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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|
4687 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
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|
4688 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
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|
4689 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4690 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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|
4691 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
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|
4692 "", "", |
12080 | 4693 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
4694 "(bytes)", "(bytes)"); | |
2435
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|
4695 } |
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|
4696 |
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diff
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|
4697 // It takes as a parameter a reference to one of the _hum_* fields, it |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4698 // deduces the corresponding value for a region in a humongous region |
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diff
changeset
|
4699 // series (either the region size, or what's left if the _hum_* field |
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diff
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|
4700 // is < the region size), and updates the _hum_* field accordingly. |
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diff
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|
4701 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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diff
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|
4702 size_t bytes = 0; |
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diff
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|
4703 // The > 0 check is to deal with the prev and next live bytes which |
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diff
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|
4704 // could be 0. |
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diff
changeset
|
4705 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3979
diff
changeset
|
4706 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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diff
changeset
|
4707 *hum_bytes -= bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4708 } |
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diff
changeset
|
4709 return bytes; |
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diff
changeset
|
4710 } |
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diff
changeset
|
4711 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4712 // 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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2369
diff
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|
4713 // from the _hum_* fields and updates those accordingly. It assumes |
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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
|
4714 // that that _hum_* fields have already been set up from the "starts |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4715 // 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
|
4716 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* 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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changeset
|
4717 size_t* capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4718 size_t* 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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changeset
|
4719 size_t* next_live_bytes) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4720 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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changeset
|
4721 *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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changeset
|
4722 *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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diff
changeset
|
4723 *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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changeset
|
4724 *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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changeset
|
4725 } |
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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
|
4726 |
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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
|
4727 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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diff
changeset
|
4728 const char* type = ""; |
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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
|
4729 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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parents:
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diff
changeset
|
4730 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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diff
changeset
|
4731 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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diff
changeset
|
4732 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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diff
changeset
|
4733 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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changeset
|
4734 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
|
4735 double gc_eff = r->gc_efficiency(); |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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10186
diff
changeset
|
4736 size_t remset_bytes = r->rem_set()->mem_size(); |
12080 | 4737 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
4738 | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4739 if (r->used() == 0) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4740 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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diff
changeset
|
4741 } 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
changeset
|
4742 type = "SURV"; |
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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
|
4743 } 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
changeset
|
4744 type = "EDEN"; |
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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
|
4745 } else if (r->startsHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4746 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
|
4747 |
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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
|
4748 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4749 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4750 "they should have been zeroed after the last time we used them"); |
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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
|
4751 // Set up the _hum_* fields. |
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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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|
4752 _hum_capacity_bytes = capacity_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4753 _hum_used_bytes = used_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4754 _hum_prev_live_bytes = prev_live_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4755 _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
|
4756 get_hum_bytes(&used_bytes, &capacity_bytes, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4757 &prev_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
|
4758 end = bottom + HeapRegion::GrainWords; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4759 } else if (r->continuesHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4760 type = "HUMC"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4761 get_hum_bytes(&used_bytes, &capacity_bytes, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4762 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4763 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4764 } else { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4765 type = "OLD"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4766 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4767 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4768 _total_used_bytes += used_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4769 _total_capacity_bytes += capacity_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4770 _total_prev_live_bytes += prev_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4771 _total_next_live_bytes += next_live_bytes; |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4772 _total_remset_bytes += remset_bytes; |
12080 | 4773 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4774 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4775 // Print a line for this particular region. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4776 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4777 G1PPRL_TYPE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4778 G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4779 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4780 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4781 G1PPRL_BYTE_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4782 G1PPRL_DOUBLE_FORMAT |
12080 | 4783 G1PPRL_BYTE_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4784 G1PPRL_BYTE_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4785 type, p2i(bottom), p2i(end), |
12080 | 4786 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
4787 remset_bytes, strong_code_roots_bytes); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4788 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4789 return false; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4790 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4791 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4792 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4793 // add static memory usages to remembered set sizes |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4794 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4795 // Print the footer of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4796 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4797 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4798 " SUMMARY" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4799 G1PPRL_SUM_MB_FORMAT("capacity") |
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
|
4800 G1PPRL_SUM_MB_PERC_FORMAT("used") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4801 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4802 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
12080 | 4803 G1PPRL_SUM_MB_FORMAT("remset") |
4804 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4805 bytes_to_mb(_total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4806 bytes_to_mb(_total_used_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4807 perc(_total_used_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4808 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4809 perc(_total_prev_live_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4810 bytes_to_mb(_total_next_live_bytes), |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4811 perc(_total_next_live_bytes, _total_capacity_bytes), |
12080 | 4812 bytes_to_mb(_total_remset_bytes), |
4813 bytes_to_mb(_total_strong_code_roots_bytes)); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4814 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4815 } |