Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 8787:fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
Summary: In CMTask::do_marking_step(), Skip offering termination and entering the first and second synchronization barriers if called from a serial context, i.e. the VM thread.
Reviewed-by: brutisso, tschatzl
| author | johnc |
|---|---|
| date | Mon, 18 Mar 2013 11:05:27 -0700 |
| parents | 15401203db6b |
| children | e864cc14ca75 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
| 1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
| 3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 1972 | 39 #include "memory/genOopClosures.inline.hpp" |
| 40 #include "memory/referencePolicy.hpp" | |
| 41 #include "memory/resourceArea.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
| 43 #include "runtime/handles.inline.hpp" | |
| 44 #include "runtime/java.hpp" | |
| 6197 | 45 #include "services/memTracker.hpp" |
| 342 | 46 |
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47 // Concurrent marking bit map wrapper |
| 342 | 48 |
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49 CMBitMapRO::CMBitMapRO(int shifter) : |
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50 _bm(), |
| 342 | 51 _shifter(shifter) { |
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52 _bmStartWord = 0; |
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53 _bmWordSize = 0; |
| 342 | 54 } |
| 55 | |
| 56 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 57 HeapWord* limit) const { | |
| 58 // First we must round addr *up* to a possible object boundary. | |
| 59 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 60 HeapWordSize << _shifter); | |
| 61 size_t addrOffset = heapWordToOffset(addr); | |
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62 if (limit == NULL) { |
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63 limit = _bmStartWord + _bmWordSize; |
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64 } |
| 342 | 65 size_t limitOffset = heapWordToOffset(limit); |
| 66 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 67 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 68 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 69 assert(nextAddr == limit || isMarked(nextAddr), | |
| 70 "get_next_one postcondition"); | |
| 71 return nextAddr; | |
| 72 } | |
| 73 | |
| 74 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 75 HeapWord* limit) const { | |
| 76 size_t addrOffset = heapWordToOffset(addr); | |
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77 if (limit == NULL) { |
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78 limit = _bmStartWord + _bmWordSize; |
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79 } |
| 342 | 80 size_t limitOffset = heapWordToOffset(limit); |
| 81 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 82 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 83 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 84 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 85 "get_next_one postcondition"); | |
| 86 return nextAddr; | |
| 87 } | |
| 88 | |
| 89 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 90 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 91 return (int) (diff >> _shifter); | |
| 92 } | |
| 93 | |
| 94 #ifndef PRODUCT | |
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95 bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
| 342 | 96 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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97 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
| 342 | 98 "size inconsistency"); |
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99 return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
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100 _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
| 342 | 101 } |
| 102 #endif | |
| 103 | |
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104 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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105 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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106 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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107 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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108 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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109 if (!brs.is_reserved()) { |
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110 warning("ConcurrentMark marking bit map allocation failure"); |
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111 return false; |
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112 } |
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113 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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114 // For now we'll just commit all of the bit map up front. |
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115 // Later on we'll try to be more parsimonious with swap. |
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116 if (!_virtual_space.initialize(brs, brs.size())) { |
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117 warning("ConcurrentMark marking bit map backing store failure"); |
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118 return false; |
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119 } |
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120 assert(_virtual_space.committed_size() == brs.size(), |
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121 "didn't reserve backing store for all of concurrent marking bit map?"); |
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122 _bm.set_map((uintptr_t*)_virtual_space.low()); |
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123 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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124 _bmWordSize, "inconsistency in bit map sizing"); |
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125 _bm.set_size(_bmWordSize >> _shifter); |
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126 return true; |
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127 } |
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128 |
| 342 | 129 void CMBitMap::clearAll() { |
| 130 _bm.clear(); | |
| 131 return; | |
| 132 } | |
| 133 | |
| 134 void CMBitMap::markRange(MemRegion mr) { | |
| 135 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 136 assert(!mr.is_empty(), "unexpected empty region"); | |
| 137 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 138 ((HeapWord *) mr.end())), | |
| 139 "markRange memory region end is not card aligned"); | |
| 140 // convert address range into offset range | |
| 141 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 142 heapWordToOffset(mr.end()), true); | |
| 143 } | |
| 144 | |
| 145 void CMBitMap::clearRange(MemRegion mr) { | |
| 146 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 147 assert(!mr.is_empty(), "unexpected empty region"); | |
| 148 // convert address range into offset range | |
| 149 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 150 heapWordToOffset(mr.end()), false); | |
| 151 } | |
| 152 | |
| 153 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 154 HeapWord* end_addr) { | |
| 155 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 156 start = MIN2(start, end_addr); | |
| 157 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 158 end = MIN2(end, end_addr); | |
| 159 assert(start <= end, "Consistency check"); | |
| 160 MemRegion mr(start, end); | |
| 161 if (!mr.is_empty()) { | |
| 162 clearRange(mr); | |
| 163 } | |
| 164 return mr; | |
| 165 } | |
| 166 | |
| 167 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 168 _base(NULL), _cm(cm) | |
| 169 #ifdef ASSERT | |
| 170 , _drain_in_progress(false) | |
| 171 , _drain_in_progress_yields(false) | |
| 172 #endif | |
| 173 {} | |
| 174 | |
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175 bool CMMarkStack::allocate(size_t capacity) { |
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176 // allocate a stack of the requisite depth |
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177 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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178 if (!rs.is_reserved()) { |
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179 warning("ConcurrentMark MarkStack allocation failure"); |
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180 return false; |
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181 } |
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182 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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183 if (!_virtual_space.initialize(rs, rs.size())) { |
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184 warning("ConcurrentMark MarkStack backing store failure"); |
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185 // Release the virtual memory reserved for the marking stack |
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186 rs.release(); |
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187 return false; |
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188 } |
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189 assert(_virtual_space.committed_size() == rs.size(), |
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190 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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191 _base = (oop*) _virtual_space.low(); |
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192 setEmpty(); |
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193 _capacity = (jint) capacity; |
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194 _saved_index = -1; |
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195 _should_expand = false; |
| 342 | 196 NOT_PRODUCT(_max_depth = 0); |
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197 return true; |
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198 } |
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199 |
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200 void CMMarkStack::expand() { |
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201 // Called, during remark, if we've overflown the marking stack during marking. |
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202 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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203 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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204 // Clear expansion flag |
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205 _should_expand = false; |
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206 if (_capacity == (jint) MarkStackSizeMax) { |
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207 if (PrintGCDetails && Verbose) { |
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208 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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209 } |
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210 return; |
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211 } |
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212 // Double capacity if possible |
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213 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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214 // Do not give up existing stack until we have managed to |
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215 // get the double capacity that we desired. |
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216 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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217 sizeof(oop))); |
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218 if (rs.is_reserved()) { |
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219 // Release the backing store associated with old stack |
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220 _virtual_space.release(); |
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221 // Reinitialize virtual space for new stack |
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222 if (!_virtual_space.initialize(rs, rs.size())) { |
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223 fatal("Not enough swap for expanded marking stack capacity"); |
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224 } |
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225 _base = (oop*)(_virtual_space.low()); |
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226 _index = 0; |
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227 _capacity = new_capacity; |
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228 } else { |
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229 if (PrintGCDetails && Verbose) { |
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230 // Failed to double capacity, continue; |
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231 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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232 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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233 _capacity / K, new_capacity / K); |
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234 } |
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235 } |
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236 } |
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237 |
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238 void CMMarkStack::set_should_expand() { |
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239 // If we're resetting the marking state because of an |
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240 // marking stack overflow, record that we should, if |
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241 // possible, expand the stack. |
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242 _should_expand = _cm->has_overflown(); |
| 342 | 243 } |
| 244 | |
| 245 CMMarkStack::~CMMarkStack() { | |
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246 if (_base != NULL) { |
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247 _base = NULL; |
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248 _virtual_space.release(); |
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249 } |
| 342 | 250 } |
| 251 | |
| 252 void CMMarkStack::par_push(oop ptr) { | |
| 253 while (true) { | |
| 254 if (isFull()) { | |
| 255 _overflow = true; | |
| 256 return; | |
| 257 } | |
| 258 // Otherwise... | |
| 259 jint index = _index; | |
| 260 jint next_index = index+1; | |
| 261 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 262 if (res == index) { | |
| 263 _base[index] = ptr; | |
| 264 // Note that we don't maintain this atomically. We could, but it | |
| 265 // doesn't seem necessary. | |
| 266 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 267 return; | |
| 268 } | |
| 269 // Otherwise, we need to try again. | |
| 270 } | |
| 271 } | |
| 272 | |
| 273 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 274 while (true) { | |
| 275 if (isFull()) { | |
| 276 _overflow = true; | |
| 277 return; | |
| 278 } | |
| 279 // Otherwise... | |
| 280 jint index = _index; | |
| 281 jint next_index = index + n; | |
| 282 if (next_index > _capacity) { | |
| 283 _overflow = true; | |
| 284 return; | |
| 285 } | |
| 286 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 287 if (res == index) { | |
| 288 for (int i = 0; i < n; i++) { | |
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289 int ind = index + i; |
| 342 | 290 assert(ind < _capacity, "By overflow test above."); |
| 291 _base[ind] = ptr_arr[i]; | |
| 292 } | |
| 293 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 294 return; | |
| 295 } | |
| 296 // Otherwise, we need to try again. | |
| 297 } | |
| 298 } | |
| 299 | |
| 300 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 301 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 302 jint start = _index; | |
| 303 jint next_index = start + n; | |
| 304 if (next_index > _capacity) { | |
| 305 _overflow = true; | |
| 306 return; | |
| 307 } | |
| 308 // Otherwise. | |
| 309 _index = next_index; | |
| 310 for (int i = 0; i < n; i++) { | |
| 311 int ind = start + i; | |
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312 assert(ind < _capacity, "By overflow test above."); |
| 342 | 313 _base[ind] = ptr_arr[i]; |
| 314 } | |
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315 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
| 342 | 316 } |
| 317 | |
| 318 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 319 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 320 jint index = _index; | |
| 321 if (index == 0) { | |
| 322 *n = 0; | |
| 323 return false; | |
| 324 } else { | |
| 325 int k = MIN2(max, index); | |
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326 jint new_ind = index - k; |
| 342 | 327 for (int j = 0; j < k; j++) { |
| 328 ptr_arr[j] = _base[new_ind + j]; | |
| 329 } | |
| 330 _index = new_ind; | |
| 331 *n = k; | |
| 332 return true; | |
| 333 } | |
| 334 } | |
| 335 | |
| 336 template<class OopClosureClass> | |
| 337 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 338 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 339 || SafepointSynchronize::is_at_safepoint(), | |
| 340 "Drain recursion must be yield-safe."); | |
| 341 bool res = true; | |
| 342 debug_only(_drain_in_progress = true); | |
| 343 debug_only(_drain_in_progress_yields = yield_after); | |
| 344 while (!isEmpty()) { | |
| 345 oop newOop = pop(); | |
| 346 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 347 assert(newOop->is_oop(), "Expected an oop"); | |
| 348 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 349 "only grey objects on this stack"); | |
| 350 newOop->oop_iterate(cl); | |
| 351 if (yield_after && _cm->do_yield_check()) { | |
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352 res = false; |
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353 break; |
| 342 | 354 } |
| 355 } | |
| 356 debug_only(_drain_in_progress = false); | |
| 357 return res; | |
| 358 } | |
| 359 | |
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360 void CMMarkStack::note_start_of_gc() { |
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361 assert(_saved_index == -1, |
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362 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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363 _saved_index = _index; |
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364 } |
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365 |
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366 void CMMarkStack::note_end_of_gc() { |
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367 // This is intentionally a guarantee, instead of an assert. If we |
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368 // accidentally add something to the mark stack during GC, it |
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369 // will be a correctness issue so it's better if we crash. we'll |
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370 // only check this once per GC anyway, so it won't be a performance |
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371 // issue in any way. |
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372 guarantee(_saved_index == _index, |
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373 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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374 _saved_index = -1; |
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375 } |
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376 |
| 342 | 377 void CMMarkStack::oops_do(OopClosure* f) { |
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378 assert(_saved_index == _index, |
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379 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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380 for (int i = 0; i < _index; i += 1) { |
| 342 | 381 f->do_oop(&_base[i]); |
| 382 } | |
| 383 } | |
| 384 | |
| 385 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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386 return _g1h->is_obj_ill(obj); |
| 342 | 387 } |
| 388 | |
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389 CMRootRegions::CMRootRegions() : |
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390 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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391 _should_abort(false), _next_survivor(NULL) { } |
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392 |
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393 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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394 _young_list = g1h->young_list(); |
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395 _cm = cm; |
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396 } |
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397 |
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398 void CMRootRegions::prepare_for_scan() { |
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399 assert(!scan_in_progress(), "pre-condition"); |
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400 |
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401 // Currently, only survivors can be root regions. |
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402 assert(_next_survivor == NULL, "pre-condition"); |
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403 _next_survivor = _young_list->first_survivor_region(); |
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404 _scan_in_progress = (_next_survivor != NULL); |
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405 _should_abort = false; |
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406 } |
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407 |
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408 HeapRegion* CMRootRegions::claim_next() { |
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409 if (_should_abort) { |
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410 // If someone has set the should_abort flag, we return NULL to |
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411 // force the caller to bail out of their loop. |
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412 return NULL; |
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413 } |
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414 |
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415 // Currently, only survivors can be root regions. |
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416 HeapRegion* res = _next_survivor; |
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417 if (res != NULL) { |
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418 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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419 // Read it again in case it changed while we were waiting for the lock. |
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420 res = _next_survivor; |
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421 if (res != NULL) { |
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422 if (res == _young_list->last_survivor_region()) { |
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423 // We just claimed the last survivor so store NULL to indicate |
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424 // that we're done. |
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425 _next_survivor = NULL; |
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426 } else { |
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427 _next_survivor = res->get_next_young_region(); |
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428 } |
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429 } else { |
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430 // Someone else claimed the last survivor while we were trying |
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431 // to take the lock so nothing else to do. |
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432 } |
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433 } |
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434 assert(res == NULL || res->is_survivor(), "post-condition"); |
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435 |
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436 return res; |
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437 } |
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438 |
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439 void CMRootRegions::scan_finished() { |
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440 assert(scan_in_progress(), "pre-condition"); |
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441 |
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442 // Currently, only survivors can be root regions. |
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443 if (!_should_abort) { |
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444 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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445 } |
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446 _next_survivor = NULL; |
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447 |
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448 { |
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449 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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450 _scan_in_progress = false; |
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451 RootRegionScan_lock->notify_all(); |
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452 } |
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453 } |
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454 |
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455 bool CMRootRegions::wait_until_scan_finished() { |
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456 if (!scan_in_progress()) return false; |
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457 |
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458 { |
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459 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
|
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460 while (scan_in_progress()) { |
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461 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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462 } |
|
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463 } |
|
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464 return true; |
|
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465 } |
|
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|
466 |
| 342 | 467 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 468 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 469 #endif // _MSC_VER | |
| 470 | |
|
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471 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
|
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472 return MAX2((n_par_threads + 2) / 4, 1U); |
|
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473 } |
|
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474 |
|
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475 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
|
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476 _g1h(g1h), |
|
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477 _markBitMap1(MinObjAlignment - 1), |
|
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478 _markBitMap2(MinObjAlignment - 1), |
| 342 | 479 |
| 480 _parallel_marking_threads(0), | |
|
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481 _max_parallel_marking_threads(0), |
| 342 | 482 _sleep_factor(0.0), |
| 483 _marking_task_overhead(1.0), | |
| 484 _cleanup_sleep_factor(0.0), | |
| 485 _cleanup_task_overhead(1.0), | |
| 2152 | 486 _cleanup_list("Cleanup List"), |
|
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487 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
|
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488 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
|
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489 CardTableModRefBS::card_shift, |
|
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490 false /* in_resource_area*/), |
|
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491 |
| 342 | 492 _prevMarkBitMap(&_markBitMap1), |
| 493 _nextMarkBitMap(&_markBitMap2), | |
| 494 | |
| 495 _markStack(this), | |
| 496 // _finger set in set_non_marking_state | |
| 497 | |
|
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498 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 499 // _active_tasks set in set_non_marking_state |
| 500 // _tasks set inside the constructor | |
|
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501 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
|
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502 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
| 342 | 503 |
| 504 _has_overflown(false), | |
| 505 _concurrent(false), | |
|
619
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506 _has_aborted(false), |
|
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470
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|
507 _restart_for_overflow(false), |
|
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|
508 _concurrent_marking_in_progress(false), |
| 342 | 509 |
| 510 // _verbose_level set below | |
| 511 | |
| 512 _init_times(), | |
| 513 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 514 _cleanup_times(), | |
| 515 _total_counting_time(0.0), | |
| 516 _total_rs_scrub_time(0.0), | |
|
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517 |
|
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518 _parallel_workers(NULL), |
|
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519 |
|
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520 _count_card_bitmaps(NULL), |
|
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521 _count_marked_bytes(NULL), |
|
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522 _completed_initialization(false) { |
|
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523 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
|
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524 if (verbose_level < no_verbose) { |
| 342 | 525 verbose_level = no_verbose; |
|
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526 } |
|
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|
527 if (verbose_level > high_verbose) { |
| 342 | 528 verbose_level = high_verbose; |
|
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|
529 } |
| 342 | 530 _verbose_level = verbose_level; |
| 531 | |
|
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532 if (verbose_low()) { |
| 342 | 533 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 534 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
|
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535 } |
| 342 | 536 |
|
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|
537 if (!_markBitMap1.allocate(heap_rs)) { |
|
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|
538 warning("Failed to allocate first CM bit map"); |
|
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|
539 return; |
|
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|
540 } |
|
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|
541 if (!_markBitMap2.allocate(heap_rs)) { |
|
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|
542 warning("Failed to allocate second CM bit map"); |
|
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|
543 return; |
|
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|
544 } |
| 342 | 545 |
| 546 // Create & start a ConcurrentMark thread. | |
|
845
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547 _cmThread = new ConcurrentMarkThread(this); |
|
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548 assert(cmThread() != NULL, "CM Thread should have been created"); |
|
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549 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
|
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550 |
| 342 | 551 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
|
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552 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
|
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553 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
| 342 | 554 |
| 555 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 556 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 557 |
|
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558 _root_regions.init(_g1h, this); |
|
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559 |
| 1284 | 560 if (ConcGCThreads > ParallelGCThreads) { |
|
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561 warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") " |
|
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562 "than ParallelGCThreads (" UINT32_FORMAT ").", |
|
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563 ConcGCThreads, ParallelGCThreads); |
|
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|
564 return; |
| 342 | 565 } |
| 566 if (ParallelGCThreads == 0) { | |
| 567 // if we are not running with any parallel GC threads we will not | |
| 568 // spawn any marking threads either | |
|
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569 _parallel_marking_threads = 0; |
|
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570 _max_parallel_marking_threads = 0; |
|
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571 _sleep_factor = 0.0; |
|
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572 _marking_task_overhead = 1.0; |
| 342 | 573 } else { |
|
8006
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8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
574 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
|
4700e77d44c1
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|
575 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
| 342 | 576 // if both are set |
| 577 _sleep_factor = 0.0; | |
| 578 _marking_task_overhead = 1.0; | |
| 751 | 579 } else if (G1MarkingOverheadPercent > 0) { |
|
8006
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|
580 // We will calculate the number of parallel marking threads based |
|
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581 // on a target overhead with respect to the soft real-time goal |
| 751 | 582 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 583 double overall_cm_overhead = |
| 751 | 584 (double) MaxGCPauseMillis * marking_overhead / |
| 585 (double) GCPauseIntervalMillis; | |
| 342 | 586 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 587 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 588 double marking_task_overhead = | |
| 589 overall_cm_overhead / marking_thread_num * | |
| 590 (double) os::processor_count(); | |
| 591 double sleep_factor = | |
| 592 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 593 | |
|
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594 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
| 342 | 595 _sleep_factor = sleep_factor; |
| 596 _marking_task_overhead = marking_task_overhead; | |
| 597 } else { | |
|
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598 // Calculate the number of parallel marking threads by scaling |
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599 // the number of parallel GC threads. |
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600 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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601 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
| 342 | 602 _sleep_factor = 0.0; |
| 603 _marking_task_overhead = 1.0; | |
| 604 } | |
| 605 | |
|
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606 assert(ConcGCThreads > 0, "Should have been set"); |
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607 _parallel_marking_threads = (uint) ConcGCThreads; |
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608 _max_parallel_marking_threads = _parallel_marking_threads; |
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609 |
|
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610 if (parallel_marking_threads() > 1) { |
| 342 | 611 _cleanup_task_overhead = 1.0; |
|
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612 } else { |
| 342 | 613 _cleanup_task_overhead = marking_task_overhead(); |
|
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614 } |
| 342 | 615 _cleanup_sleep_factor = |
| 616 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 617 | |
| 618 #if 0 | |
| 619 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 620 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 621 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 622 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 623 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 624 #endif | |
| 625 | |
|
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626 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
|
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627 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
|
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628 _max_parallel_marking_threads, false, true); |
|
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629 if (_parallel_workers == NULL) { |
| 342 | 630 vm_exit_during_initialization("Failed necessary allocation."); |
|
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631 } else { |
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632 _parallel_workers->initialize_workers(); |
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633 } |
| 342 | 634 } |
| 635 | |
|
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636 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
|
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637 uintx mark_stack_size = |
|
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638 MIN2(MarkStackSizeMax, |
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639 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
|
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640 // Verify that the calculated value for MarkStackSize is in range. |
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641 // It would be nice to use the private utility routine from Arguments. |
|
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642 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
|
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643 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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644 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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645 mark_stack_size, 1, MarkStackSizeMax); |
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646 return; |
|
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647 } |
|
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648 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
|
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649 } else { |
|
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650 // Verify MarkStackSize is in range. |
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651 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
|
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652 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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653 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
|
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654 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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655 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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656 MarkStackSize, 1, MarkStackSizeMax); |
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657 return; |
|
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658 } |
|
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659 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
|
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660 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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661 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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662 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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663 MarkStackSize, MarkStackSizeMax); |
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664 return; |
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665 } |
|
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666 } |
|
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|
667 } |
|
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668 } |
|
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|
669 |
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670 if (!_markStack.allocate(MarkStackSize)) { |
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671 warning("Failed to allocate CM marking stack"); |
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672 return; |
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|
673 } |
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|
674 |
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675 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
|
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676 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
|
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677 |
|
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678 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
|
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679 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
|
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680 |
|
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681 BitMap::idx_t card_bm_size = _card_bm.size(); |
|
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682 |
|
442f942757c0
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683 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
|
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684 _active_tasks = _max_worker_id; |
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685 |
|
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686 size_t max_regions = (size_t) _g1h->max_regions(); |
|
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687 for (uint i = 0; i < _max_worker_id; ++i) { |
|
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688 CMTaskQueue* task_queue = new CMTaskQueue(); |
|
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689 task_queue->initialize(); |
|
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690 _task_queues->register_queue(i, task_queue); |
|
442f942757c0
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|
691 |
|
442f942757c0
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692 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
|
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693 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
|
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694 |
|
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695 _tasks[i] = new CMTask(i, this, |
|
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696 _count_marked_bytes[i], |
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697 &_count_card_bitmaps[i], |
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698 task_queue, _task_queues); |
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|
699 |
|
442f942757c0
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700 _accum_task_vtime[i] = 0.0; |
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701 } |
|
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|
702 |
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703 // Calculate the card number for the bottom of the heap. Used |
|
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704 // in biasing indexes into the accounting card bitmaps. |
|
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705 _heap_bottom_card_num = |
|
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706 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
|
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707 CardTableModRefBS::card_shift); |
|
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708 |
|
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709 // Clear all the liveness counting data |
|
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710 clear_all_count_data(); |
|
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711 |
| 342 | 712 // so that the call below can read a sensible value |
|
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713 _heap_start = (HeapWord*) heap_rs.base(); |
| 342 | 714 set_non_marking_state(); |
|
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715 _completed_initialization = true; |
| 342 | 716 } |
| 717 | |
| 718 void ConcurrentMark::update_g1_committed(bool force) { | |
| 719 // If concurrent marking is not in progress, then we do not need to | |
|
5988
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7127697: G1: remove dead code after recent concurrent mark changes
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|
720 // update _heap_end. |
|
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7055073: G1: code cleanup in the concurrentMark.* files
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|
721 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 722 |
| 723 MemRegion committed = _g1h->g1_committed(); | |
|
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724 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 725 HeapWord* new_end = committed.end(); |
| 726 if (new_end > _heap_end) { | |
| 727 // The heap has been expanded. | |
| 728 | |
| 729 _heap_end = new_end; | |
| 730 } | |
| 731 // Notice that the heap can also shrink. However, this only happens | |
| 732 // during a Full GC (at least currently) and the entire marking | |
| 733 // phase will bail out and the task will not be restarted. So, let's | |
| 734 // do nothing. | |
| 735 } | |
| 736 | |
| 737 void ConcurrentMark::reset() { | |
| 738 // Starting values for these two. This should be called in a STW | |
| 739 // phase. CM will be notified of any future g1_committed expansions | |
| 740 // will be at the end of evacuation pauses, when tasks are | |
| 741 // inactive. | |
| 742 MemRegion committed = _g1h->g1_committed(); | |
| 743 _heap_start = committed.start(); | |
| 744 _heap_end = committed.end(); | |
| 745 | |
|
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746 // Separated the asserts so that we know which one fires. |
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747 assert(_heap_start != NULL, "heap bounds should look ok"); |
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748 assert(_heap_end != NULL, "heap bounds should look ok"); |
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749 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 750 |
|
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751 // Reset all the marking data structures and any necessary flags |
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752 reset_marking_state(); |
| 342 | 753 |
|
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754 if (verbose_low()) { |
| 342 | 755 gclog_or_tty->print_cr("[global] resetting"); |
|
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756 } |
| 342 | 757 |
| 758 // We do reset all of them, since different phases will use | |
| 759 // different number of active threads. So, it's easiest to have all | |
| 760 // of them ready. | |
|
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761 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 762 _tasks[i]->reset(_nextMarkBitMap); |
|
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763 } |
| 342 | 764 |
| 765 // we need this to make sure that the flag is on during the evac | |
| 766 // pause with initial mark piggy-backed | |
| 767 set_concurrent_marking_in_progress(); | |
| 768 } | |
| 769 | |
|
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770 |
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771 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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772 _markStack.set_should_expand(); |
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773 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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774 if (clear_overflow) { |
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775 clear_has_overflown(); |
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776 } else { |
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777 assert(has_overflown(), "pre-condition"); |
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778 } |
|
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779 _finger = _heap_start; |
|
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780 |
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781 for (uint i = 0; i < _max_worker_id; ++i) { |
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782 CMTaskQueue* queue = _task_queues->queue(i); |
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783 queue->set_empty(); |
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784 } |
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785 } |
|
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|
786 |
|
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787 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
|
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788 assert(active_tasks <= _max_worker_id, "we should not have more"); |
| 342 | 789 |
| 790 _active_tasks = active_tasks; | |
| 791 // Need to update the three data structures below according to the | |
| 792 // number of active threads for this phase. | |
| 793 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 794 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 795 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 796 | |
| 797 _concurrent = concurrent; | |
| 798 // We propagate this to all tasks, not just the active ones. | |
|
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799 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 800 _tasks[i]->set_concurrent(concurrent); |
| 801 | |
| 802 if (concurrent) { | |
| 803 set_concurrent_marking_in_progress(); | |
| 804 } else { | |
| 805 // We currently assume that the concurrent flag has been set to | |
| 806 // false before we start remark. At this point we should also be | |
| 807 // in a STW phase. | |
|
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808 assert(!concurrent_marking_in_progress(), "invariant"); |
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809 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 810 update_g1_committed(true); |
| 811 } | |
| 812 } | |
| 813 | |
| 814 void ConcurrentMark::set_non_marking_state() { | |
| 815 // We set the global marking state to some default values when we're | |
| 816 // not doing marking. | |
|
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817 reset_marking_state(); |
| 342 | 818 _active_tasks = 0; |
| 819 clear_concurrent_marking_in_progress(); | |
| 820 } | |
| 821 | |
| 822 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 823 // The ConcurrentMark instance is never freed. |
| 824 ShouldNotReachHere(); | |
| 342 | 825 } |
| 826 | |
| 827 void ConcurrentMark::clearNextBitmap() { | |
|
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828 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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829 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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830 |
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831 // Make sure that the concurrent mark thread looks to still be in |
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832 // the current cycle. |
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833 guarantee(cmThread()->during_cycle(), "invariant"); |
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834 |
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835 // We are finishing up the current cycle by clearing the next |
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836 // marking bitmap and getting it ready for the next cycle. During |
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837 // this time no other cycle can start. So, let's make sure that this |
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838 // is the case. |
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839 guarantee(!g1h->mark_in_progress(), "invariant"); |
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840 |
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841 // clear the mark bitmap (no grey objects to start with). |
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842 // We need to do this in chunks and offer to yield in between |
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843 // each chunk. |
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844 HeapWord* start = _nextMarkBitMap->startWord(); |
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845 HeapWord* end = _nextMarkBitMap->endWord(); |
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846 HeapWord* cur = start; |
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847 size_t chunkSize = M; |
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848 while (cur < end) { |
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849 HeapWord* next = cur + chunkSize; |
|
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850 if (next > end) { |
|
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851 next = end; |
|
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852 } |
|
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853 MemRegion mr(cur,next); |
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854 _nextMarkBitMap->clearRange(mr); |
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855 cur = next; |
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|
856 do_yield_check(); |
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857 |
|
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|
858 // Repeat the asserts from above. We'll do them as asserts here to |
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|
859 // minimize their overhead on the product. However, we'll have |
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860 // them as guarantees at the beginning / end of the bitmap |
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861 // clearing to get some checking in the product. |
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862 assert(cmThread()->during_cycle(), "invariant"); |
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863 assert(!g1h->mark_in_progress(), "invariant"); |
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864 } |
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|
865 |
|
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866 // Clear the liveness counting data |
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|
867 clear_all_count_data(); |
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|
868 |
|
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|
869 // Repeat the asserts from above. |
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870 guarantee(cmThread()->during_cycle(), "invariant"); |
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871 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 872 } |
| 873 | |
| 874 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 875 public: | |
| 876 bool doHeapRegion(HeapRegion* r) { | |
| 877 if (!r->continuesHumongous()) { | |
|
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878 r->note_start_of_marking(); |
| 342 | 879 } |
| 880 return false; | |
| 881 } | |
| 882 }; | |
| 883 | |
| 884 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 885 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 886 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 887 | |
| 888 _has_aborted = false; | |
| 889 | |
|
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890 #ifndef PRODUCT |
| 1044 | 891 if (G1PrintReachableAtInitialMark) { |
| 1388 | 892 print_reachable("at-cycle-start", |
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893 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 894 } |
|
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895 #endif |
| 342 | 896 |
| 897 // Initialise marking structures. This has to be done in a STW phase. | |
| 898 reset(); | |
|
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899 |
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900 // For each region note start of marking. |
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901 NoteStartOfMarkHRClosure startcl; |
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|
902 g1h->heap_region_iterate(&startcl); |
| 342 | 903 } |
| 904 | |
| 905 | |
| 906 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 907 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 908 | |
|
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|
909 // If we force an overflow during remark, the remark operation will |
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|
910 // actually abort and we'll restart concurrent marking. If we always |
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|
911 // force an oveflow during remark we'll never actually complete the |
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|
912 // marking phase. So, we initilize this here, at the start of the |
|
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|
913 // cycle, so that at the remaining overflow number will decrease at |
|
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|
914 // every remark and we'll eventually not need to cause one. |
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915 force_overflow_stw()->init(); |
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916 |
|
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917 // Start Concurrent Marking weak-reference discovery. |
|
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918 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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919 // enable ("weak") refs discovery |
|
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920 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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921 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 922 |
| 923 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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924 // This is the start of the marking cycle, we're expected all |
|
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925 // threads to have SATB queues with active set to false. |
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926 satb_mq_set.set_active_all_threads(true, /* new active value */ |
|
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927 false /* expected_active */); |
| 342 | 928 |
|
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929 _root_regions.prepare_for_scan(); |
|
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930 |
| 342 | 931 // update_g1_committed() will be called at the end of an evac pause |
| 932 // when marking is on. So, it's also called at the end of the | |
| 933 // initial-mark pause to update the heap end, if the heap expands | |
| 934 // during it. No need to call it here. | |
| 935 } | |
| 936 | |
| 937 /* | |
|
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938 * Notice that in the next two methods, we actually leave the STS |
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939 * during the barrier sync and join it immediately afterwards. If we |
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940 * do not do this, the following deadlock can occur: one thread could |
|
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941 * be in the barrier sync code, waiting for the other thread to also |
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942 * sync up, whereas another one could be trying to yield, while also |
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943 * waiting for the other threads to sync up too. |
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944 * |
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945 * Note, however, that this code is also used during remark and in |
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946 * this case we should not attempt to leave / enter the STS, otherwise |
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947 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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948 * (product). So we should only leave / enter the STS if we are |
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949 * operating concurrently. |
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950 * |
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951 * Because the thread that does the sync barrier has left the STS, it |
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952 * is possible to be suspended for a Full GC or an evacuation pause |
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953 * could occur. This is actually safe, since the entering the sync |
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954 * barrier is one of the last things do_marking_step() does, and it |
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955 * doesn't manipulate any data structures afterwards. |
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956 */ |
| 342 | 957 |
|
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958 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
|
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959 if (verbose_low()) { |
|
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960 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
|
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961 } |
| 342 | 962 |
|
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963 if (concurrent()) { |
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964 ConcurrentGCThread::stsLeave(); |
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965 } |
| 342 | 966 _first_overflow_barrier_sync.enter(); |
|
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967 if (concurrent()) { |
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968 ConcurrentGCThread::stsJoin(); |
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969 } |
| 342 | 970 // at this point everyone should have synced up and not be doing any |
| 971 // more work | |
| 972 | |
|
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973 if (verbose_low()) { |
|
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974 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
|
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975 } |
| 342 | 976 |
|
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977 // let the task associated with with worker 0 do this |
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978 if (worker_id == 0) { |
| 342 | 979 // task 0 is responsible for clearing the global data structures |
|
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980 // We should be here because of an overflow. During STW we should |
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981 // not clear the overflow flag since we rely on it being true when |
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982 // we exit this method to abort the pause and restart concurent |
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983 // marking. |
|
7450
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984 reset_marking_state(concurrent() /* clear_overflow */); |
|
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985 force_overflow()->update(); |
| 342 | 986 |
|
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987 if (G1Log::fine()) { |
| 342 | 988 gclog_or_tty->date_stamp(PrintGCDateStamps); |
| 989 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 990 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 991 } | |
| 992 } | |
| 993 | |
| 994 // after this, each task should reset its own data structures then | |
| 995 // then go into the second barrier | |
| 996 } | |
| 997 | |
|
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998 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
|
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999 if (verbose_low()) { |
|
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1000 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
|
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1001 } |
| 342 | 1002 |
|
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1003 if (concurrent()) { |
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1004 ConcurrentGCThread::stsLeave(); |
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1005 } |
| 342 | 1006 _second_overflow_barrier_sync.enter(); |
|
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1007 if (concurrent()) { |
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1008 ConcurrentGCThread::stsJoin(); |
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1009 } |
| 342 | 1010 // at this point everything should be re-initialised and ready to go |
| 1011 | |
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1012 if (verbose_low()) { |
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1013 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1014 } |
| 342 | 1015 } |
| 1016 | |
|
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1017 #ifndef PRODUCT |
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1018 void ForceOverflowSettings::init() { |
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1019 _num_remaining = G1ConcMarkForceOverflow; |
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1020 _force = false; |
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1021 update(); |
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1022 } |
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1023 |
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1024 void ForceOverflowSettings::update() { |
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1025 if (_num_remaining > 0) { |
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1026 _num_remaining -= 1; |
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1027 _force = true; |
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1028 } else { |
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1029 _force = false; |
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1030 } |
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1031 } |
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1032 |
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1033 bool ForceOverflowSettings::should_force() { |
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1034 if (_force) { |
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1035 _force = false; |
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1036 return true; |
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1037 } else { |
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1038 return false; |
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1039 } |
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1040 } |
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1041 #endif // !PRODUCT |
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1042 |
| 342 | 1043 class CMConcurrentMarkingTask: public AbstractGangTask { |
| 1044 private: | |
| 1045 ConcurrentMark* _cm; | |
| 1046 ConcurrentMarkThread* _cmt; | |
| 1047 | |
| 1048 public: | |
|
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1049 void work(uint worker_id) { |
|
1023
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1050 assert(Thread::current()->is_ConcurrentGC_thread(), |
|
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1051 "this should only be done by a conc GC thread"); |
|
1974
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1052 ResourceMark rm; |
| 342 | 1053 |
| 1054 double start_vtime = os::elapsedVTime(); | |
| 1055 | |
| 1056 ConcurrentGCThread::stsJoin(); | |
| 1057 | |
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1058 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1059 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1060 the_task->record_start_time(); |
| 1061 if (!_cm->has_aborted()) { | |
| 1062 do { | |
| 1063 double start_vtime_sec = os::elapsedVTime(); | |
| 1064 double start_time_sec = os::elapsedTime(); | |
|
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1065 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1066 |
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1067 the_task->do_marking_step(mark_step_duration_ms, |
|
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1068 true /* do_termination */, |
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1069 false /* is_serial*/); |
|
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1070 |
| 342 | 1071 double end_time_sec = os::elapsedTime(); |
| 1072 double end_vtime_sec = os::elapsedVTime(); | |
| 1073 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1074 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 1075 _cm->clear_has_overflown(); | |
| 1076 | |
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1077 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 1078 |
| 1079 jlong sleep_time_ms; | |
| 1080 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1081 sleep_time_ms = | |
| 1082 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 1083 ConcurrentGCThread::stsLeave(); | |
| 1084 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1085 ConcurrentGCThread::stsJoin(); | |
| 1086 } | |
| 1087 double end_time2_sec = os::elapsedTime(); | |
| 1088 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 1089 | |
| 1090 #if 0 | |
| 1091 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 1092 "overhead %1.4lf", | |
| 1093 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 1094 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 1095 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 1096 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 1097 #endif | |
| 1098 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1099 } | |
| 1100 the_task->record_end_time(); | |
|
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1101 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1102 |
| 1103 ConcurrentGCThread::stsLeave(); | |
| 1104 | |
| 1105 double end_vtime = os::elapsedVTime(); | |
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1106 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1107 } |
| 1108 | |
| 1109 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1110 ConcurrentMarkThread* cmt) : | |
| 1111 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1112 | |
| 1113 ~CMConcurrentMarkingTask() { } | |
| 1114 }; | |
| 1115 | |
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1116 // Calculates the number of active workers for a concurrent |
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1117 // phase. |
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1118 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1119 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1120 uint n_conc_workers = 0; |
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1121 if (!UseDynamicNumberOfGCThreads || |
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1122 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1123 !ForceDynamicNumberOfGCThreads)) { |
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1124 n_conc_workers = max_parallel_marking_threads(); |
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1125 } else { |
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1126 n_conc_workers = |
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1127 AdaptiveSizePolicy::calc_default_active_workers( |
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1128 max_parallel_marking_threads(), |
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1129 1, /* Minimum workers */ |
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1130 parallel_marking_threads(), |
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1131 Threads::number_of_non_daemon_threads()); |
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1132 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1133 // that scaling has already gone into "_max_parallel_marking_threads". |
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1134 } |
| 4711 | 1135 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1136 return n_conc_workers; | |
|
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1137 } |
| 4711 | 1138 // If we are not running with any parallel GC threads we will not |
| 1139 // have spawned any marking threads either. Hence the number of | |
| 1140 // concurrent workers should be 0. | |
| 1141 return 0; | |
|
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1142 } |
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1143 |
|
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1144 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1145 // Currently, only survivors can be root regions. |
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1146 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1147 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1148 |
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1149 const uintx interval = PrefetchScanIntervalInBytes; |
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1150 HeapWord* curr = hr->bottom(); |
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1151 const HeapWord* end = hr->top(); |
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1152 while (curr < end) { |
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1153 Prefetch::read(curr, interval); |
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1154 oop obj = oop(curr); |
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1155 int size = obj->oop_iterate(&cl); |
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1156 assert(size == obj->size(), "sanity"); |
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1157 curr += size; |
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1158 } |
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1159 } |
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1160 |
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1161 class CMRootRegionScanTask : public AbstractGangTask { |
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1162 private: |
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1163 ConcurrentMark* _cm; |
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1164 |
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1165 public: |
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1166 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1167 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1168 |
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1169 void work(uint worker_id) { |
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1170 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1171 "this should only be done by a conc GC thread"); |
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1172 |
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1173 CMRootRegions* root_regions = _cm->root_regions(); |
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1174 HeapRegion* hr = root_regions->claim_next(); |
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1175 while (hr != NULL) { |
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1176 _cm->scanRootRegion(hr, worker_id); |
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1177 hr = root_regions->claim_next(); |
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1178 } |
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1179 } |
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1180 }; |
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1181 |
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1182 void ConcurrentMark::scanRootRegions() { |
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1183 // scan_in_progress() will have been set to true only if there was |
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1184 // at least one root region to scan. So, if it's false, we |
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1185 // should not attempt to do any further work. |
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1186 if (root_regions()->scan_in_progress()) { |
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1187 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1188 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1189 "Maximum number of marking threads exceeded"); |
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1190 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1191 |
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1192 CMRootRegionScanTask task(this); |
|
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1193 if (use_parallel_marking_threads()) { |
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1194 _parallel_workers->set_active_workers((int) active_workers); |
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1195 _parallel_workers->run_task(&task); |
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1196 } else { |
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1197 task.work(0); |
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1198 } |
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1199 |
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1200 // It's possible that has_aborted() is true here without actually |
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1201 // aborting the survivor scan earlier. This is OK as it's |
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1202 // mainly used for sanity checking. |
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1203 root_regions()->scan_finished(); |
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1204 } |
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1205 } |
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1206 |
| 342 | 1207 void ConcurrentMark::markFromRoots() { |
| 1208 // we might be tempted to assert that: | |
| 1209 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1210 // "inconsistent argument?"); | |
| 1211 // However that wouldn't be right, because it's possible that | |
| 1212 // a safepoint is indeed in progress as a younger generation | |
| 1213 // stop-the-world GC happens even as we mark in this generation. | |
| 1214 | |
| 1215 _restart_for_overflow = false; | |
|
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1216 force_overflow_conc()->init(); |
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1217 |
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1218 // _g1h has _n_par_threads |
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1219 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1220 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1221 "Maximum number of marking threads exceeded"); |
| 4711 | 1222 |
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1223 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1224 |
| 1225 // Parallel task terminator is set in "set_phase()" | |
| 1226 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1227 |
| 1228 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
|
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1229 if (use_parallel_marking_threads()) { |
| 4711 | 1230 _parallel_workers->set_active_workers((int)active_workers); |
| 1231 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1232 // and the decisions on that MT processing is made elsewhere. | |
| 1233 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1234 _parallel_workers->run_task(&markingTask); |
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1235 } else { |
| 342 | 1236 markingTask.work(0); |
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1237 } |
| 342 | 1238 print_stats(); |
| 1239 } | |
| 1240 | |
| 1241 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1242 // world is stopped at this checkpoint | |
| 1243 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1244 "world should be stopped"); | |
|
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1245 |
| 342 | 1246 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1247 | |
| 1248 // If a full collection has happened, we shouldn't do this. | |
| 1249 if (has_aborted()) { | |
| 1250 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1251 return; | |
| 1252 } | |
| 1253 | |
|
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1254 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1255 |
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1256 if (VerifyDuringGC) { |
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1257 HandleMark hm; // handle scope |
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1258 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1259 Universe::heap()->prepare_for_verify(); |
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1260 Universe::verify(/* silent */ false, |
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1261 /* option */ VerifyOption_G1UsePrevMarking); |
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1262 } |
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1263 |
| 342 | 1264 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1265 g1p->record_concurrent_mark_remark_start(); | |
| 1266 | |
| 1267 double start = os::elapsedTime(); | |
| 1268 | |
| 1269 checkpointRootsFinalWork(); | |
| 1270 | |
| 1271 double mark_work_end = os::elapsedTime(); | |
| 1272 | |
| 1273 weakRefsWork(clear_all_soft_refs); | |
| 1274 | |
| 1275 if (has_overflown()) { | |
| 1276 // Oops. We overflowed. Restart concurrent marking. | |
| 1277 _restart_for_overflow = true; | |
|
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1278 // Clear the marking state because we will be restarting |
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1279 // marking due to overflowing the global mark stack. |
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1280 reset_marking_state(); |
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1281 if (G1TraceMarkStackOverflow) { |
| 342 | 1282 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
|
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1283 } |
| 342 | 1284 } else { |
|
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1285 // Aggregate the per-task counting data that we have accumulated |
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1286 // while marking. |
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1287 aggregate_count_data(); |
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1288 |
| 2149 | 1289 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1290 // We're done with marking. |
|
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1291 // This is the end of the marking cycle, we're expected all |
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1292 // threads to have SATB queues with active set to true. |
| 2149 | 1293 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1294 true /* expected_active */); | |
| 811 | 1295 |
| 1296 if (VerifyDuringGC) { | |
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1297 HandleMark hm; // handle scope |
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1298 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1299 Universe::heap()->prepare_for_verify(); |
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1300 Universe::verify(/* silent */ false, |
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1301 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1302 } |
|
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1303 assert(!restart_for_overflow(), "sanity"); |
|
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1304 // Completely reset the marking state since marking completed |
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1305 set_non_marking_state(); |
|
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1306 } |
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1307 |
|
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1308 // Expand the marking stack, if we have to and if we can. |
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1309 if (_markStack.should_expand()) { |
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1310 _markStack.expand(); |
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1311 } |
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1312 |
| 342 | 1313 // Statistics |
| 1314 double now = os::elapsedTime(); | |
| 1315 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1316 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1317 _remark_times.add((now - start) * 1000.0); | |
| 1318 | |
| 1319 g1p->record_concurrent_mark_remark_end(); | |
| 1320 } | |
| 1321 | |
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1322 // Base class of the closures that finalize and verify the |
|
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1323 // liveness counting data. |
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1324 class CMCountDataClosureBase: public HeapRegionClosure { |
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1325 protected: |
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1326 G1CollectedHeap* _g1h; |
| 342 | 1327 ConcurrentMark* _cm; |
|
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1328 CardTableModRefBS* _ct_bs; |
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1329 |
| 342 | 1330 BitMap* _region_bm; |
| 1331 BitMap* _card_bm; | |
|
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1332 |
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1333 // Takes a region that's not empty (i.e., it has at least one |
| 829 | 1334 // live object in it and sets its corresponding bit on the region |
| 1335 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1336 // to 1 the bits on the region bitmap that correspond to its | |
| 1337 // associated "continues humongous" regions. | |
| 1338 void set_bit_for_region(HeapRegion* hr) { | |
| 1339 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1340 | |
|
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1341 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
| 829 | 1342 if (!hr->startsHumongous()) { |
| 1343 // Normal (non-humongous) case: just set the bit. | |
|
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1344 _region_bm->par_at_put(index, true); |
| 829 | 1345 } else { |
| 1346 // Starts humongous case: calculate how many regions are part of | |
|
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1347 // this humongous region and then set the bit range. |
|
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1348 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
|
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1349 _region_bm->par_at_put_range(index, end_index, true); |
| 829 | 1350 } |
| 1351 } | |
| 1352 | |
|
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1353 public: |
|
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1354 CMCountDataClosureBase(G1CollectedHeap* g1h, |
|
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1355 BitMap* region_bm, BitMap* card_bm): |
|
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1356 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1357 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
|
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1358 _region_bm(region_bm), _card_bm(card_bm) { } |
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1359 }; |
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1360 |
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1361 // Closure that calculates the # live objects per region. Used |
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1362 // for verification purposes during the cleanup pause. |
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1363 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1364 CMBitMapRO* _bm; |
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1365 size_t _region_marked_bytes; |
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1366 |
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1367 public: |
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1368 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1369 BitMap* region_bm, BitMap* card_bm) : |
|
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1370 CMCountDataClosureBase(g1h, region_bm, card_bm), |
|
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1371 _bm(bm), _region_marked_bytes(0) { } |
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1372 |
| 342 | 1373 bool doHeapRegion(HeapRegion* hr) { |
| 1374 | |
| 639 | 1375 if (hr->continuesHumongous()) { |
| 829 | 1376 // We will ignore these here and process them when their |
| 1377 // associated "starts humongous" region is processed (see | |
| 1378 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1379 // associated "starts humongous" region to have their bit set to | |
| 1380 // 1 since, due to the region chunking in the parallel region | |
| 1381 // iteration, a "continues humongous" region might be visited | |
| 1382 // before its associated "starts humongous". | |
| 639 | 1383 return false; |
| 1384 } | |
| 342 | 1385 |
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1386 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1387 HeapWord* start = hr->bottom(); |
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1388 |
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1389 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1390 err_msg("Preconditions not met - " |
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1391 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1392 start, ntams, hr->end())); |
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1393 |
| 342 | 1394 // Find the first marked object at or after "start". |
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1395 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1396 |
| 342 | 1397 size_t marked_bytes = 0; |
| 1398 | |
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1399 while (start < ntams) { |
| 342 | 1400 oop obj = oop(start); |
| 1401 int obj_sz = obj->size(); | |
|
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1402 HeapWord* obj_end = start + obj_sz; |
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1403 |
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1404 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1405 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1406 |
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1407 // Note: if we're looking at the last region in heap - obj_end |
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|
1408 // could be actually just beyond the end of the heap; end_idx |
|
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1409 // will then correspond to a (non-existent) card that is also |
|
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|
1410 // just beyond the heap. |
|
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|
1411 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
|
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1412 // end of object is not card aligned - increment to cover |
|
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1413 // all the cards spanned by the object |
|
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|
1414 end_idx += 1; |
|
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|
1415 } |
|
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|
1416 |
|
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|
1417 // Set the bits in the card BM for the cards spanned by this object. |
|
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|
1418 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
6027
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|
1419 |
|
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|
1420 // Add the size of this object to the number of marked bytes. |
|
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|
1421 marked_bytes += (size_t)obj_sz * HeapWordSize; |
|
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1422 |
| 342 | 1423 // Find the next marked object after this one. |
|
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|
1424 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
|
3776
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|
1425 } |
|
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|
1426 |
|
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|
1427 // Mark the allocated-since-marking portion... |
|
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1428 HeapWord* top = hr->top(); |
|
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1429 if (ntams < top) { |
|
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|
1430 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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|
1431 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
|
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|
1432 |
|
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|
1433 // Note: if we're looking at the last region in heap - top |
|
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1434 // could be actually just beyond the end of the heap; end_idx |
|
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1435 // will then correspond to a (non-existent) card that is also |
|
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|
1436 // just beyond the heap. |
|
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|
1437 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
|
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|
1438 // end of object is not card aligned - increment to cover |
|
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|
1439 // all the cards spanned by the object |
|
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|
1440 end_idx += 1; |
|
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|
1441 } |
|
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|
1442 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
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|
1443 |
|
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|
1444 // This definitely means the region has live objects. |
|
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|
1445 set_bit_for_region(hr); |
| 342 | 1446 } |
| 1447 | |
| 1448 // Update the live region bitmap. | |
| 1449 if (marked_bytes > 0) { | |
| 829 | 1450 set_bit_for_region(hr); |
| 342 | 1451 } |
|
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|
1452 |
|
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|
1453 // Set the marked bytes for the current region so that |
|
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|
1454 // it can be queried by a calling verificiation routine |
|
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1455 _region_marked_bytes = marked_bytes; |
|
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1456 |
| 342 | 1457 return false; |
| 1458 } | |
| 1459 | |
|
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|
1460 size_t region_marked_bytes() const { return _region_marked_bytes; } |
|
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|
1461 }; |
|
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|
1462 |
|
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|
1463 // Heap region closure used for verifying the counting data |
|
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1464 // that was accumulated concurrently and aggregated during |
|
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|
1465 // the remark pause. This closure is applied to the heap |
|
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1466 // regions during the STW cleanup pause. |
|
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|
1467 |
|
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|
1468 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
|
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|
1469 G1CollectedHeap* _g1h; |
|
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|
1470 ConcurrentMark* _cm; |
|
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|
1471 CalcLiveObjectsClosure _calc_cl; |
|
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|
1472 BitMap* _region_bm; // Region BM to be verified |
|
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|
1473 BitMap* _card_bm; // Card BM to be verified |
|
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|
1474 bool _verbose; // verbose output? |
|
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|
1475 |
|
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|
1476 BitMap* _exp_region_bm; // Expected Region BM values |
|
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|
1477 BitMap* _exp_card_bm; // Expected card BM values |
|
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|
1478 |
|
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|
1479 int _failures; |
|
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|
1480 |
|
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|
1481 public: |
|
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|
1482 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
|
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|
1483 BitMap* region_bm, |
|
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|
1484 BitMap* card_bm, |
|
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|
1485 BitMap* exp_region_bm, |
|
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|
1486 BitMap* exp_card_bm, |
|
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|
1487 bool verbose) : |
|
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|
1488 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
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|
1489 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
|
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|
1490 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
|
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|
1491 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
|
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|
1492 _failures(0) { } |
|
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|
1493 |
|
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|
1494 int failures() const { return _failures; } |
|
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|
1495 |
|
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|
1496 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1497 if (hr->continuesHumongous()) { |
|
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|
1498 // We will ignore these here and process them when their |
|
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|
1499 // associated "starts humongous" region is processed (see |
|
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|
1500 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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|
1501 // associated "starts humongous" region to have their bit set to |
|
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|
1502 // 1 since, due to the region chunking in the parallel region |
|
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|
1503 // iteration, a "continues humongous" region might be visited |
|
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|
1504 // before its associated "starts humongous". |
|
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|
1505 return false; |
|
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|
1506 } |
|
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|
1507 |
|
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|
1508 int failures = 0; |
|
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|
1509 |
|
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|
1510 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
|
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|
1511 // this region and set the corresponding bits in the expected region |
|
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|
1512 // and card bitmaps. |
|
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|
1513 bool res = _calc_cl.doHeapRegion(hr); |
|
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|
1514 assert(res == false, "should be continuing"); |
|
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|
1515 |
|
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|
1516 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
|
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|
1517 Mutex::_no_safepoint_check_flag); |
|
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|
1518 |
|
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|
1519 // Verify the marked bytes for this region. |
|
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|
1520 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
|
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|
1521 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
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|
1522 |
|
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|
1523 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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|
1524 // we have missed accounting some objects during the actual marking. |
|
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|
1525 if (exp_marked_bytes > act_marked_bytes) { |
|
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|
1526 if (_verbose) { |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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|
1527 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
|
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|
1528 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
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|
1529 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
|
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|
1530 } |
|
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|
1531 failures += 1; |
|
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|
1532 } |
|
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|
1533 |
|
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|
1534 // Verify the bit, for this region, in the actual and expected |
|
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|
1535 // (which was just calculated) region bit maps. |
|
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|
1536 // We're not OK if the bit in the calculated expected region |
|
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1537 // bitmap is set and the bit in the actual region bitmap is not. |
|
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|
1538 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
|
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|
1539 |
|
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|
1540 bool expected = _exp_region_bm->at(index); |
|
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|
1541 bool actual = _region_bm->at(index); |
|
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1542 if (expected && !actual) { |
|
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|
1543 if (_verbose) { |
|
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1544 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
|
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|
1545 "expected: %s, actual: %s", |
|
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|
1546 hr->hrs_index(), |
|
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|
1547 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1548 } |
|
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|
1549 failures += 1; |
|
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|
1550 } |
|
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|
1551 |
|
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|
1552 // Verify that the card bit maps for the cards spanned by the current |
|
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|
1553 // region match. We have an error if we have a set bit in the expected |
|
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|
1554 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1555 |
|
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|
1556 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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|
1557 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1558 |
|
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|
1559 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
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|
1560 expected = _exp_card_bm->at(i); |
|
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|
1561 actual = _card_bm->at(i); |
|
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|
1562 |
|
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|
1563 if (expected && !actual) { |
|
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|
1564 if (_verbose) { |
|
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|
1565 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
|
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|
1566 "expected: %s, actual: %s", |
|
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|
1567 hr->hrs_index(), i, |
|
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|
1568 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1569 } |
|
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|
1570 failures += 1; |
|
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|
1571 } |
|
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|
1572 } |
|
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|
1573 |
|
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|
1574 if (failures > 0 && _verbose) { |
|
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|
1575 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
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|
1576 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
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|
1577 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
|
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|
1578 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
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|
1579 } |
|
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|
1580 |
|
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|
1581 _failures += failures; |
|
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|
1582 |
|
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|
1583 // We could stop iteration over the heap when we |
|
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|
1584 // find the first violating region by returning true. |
|
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|
1585 return false; |
|
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|
1586 } |
| 342 | 1587 }; |
| 1588 | |
| 1589 | |
|
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|
1590 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
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|
1591 protected: |
|
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|
1592 G1CollectedHeap* _g1h; |
|
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|
1593 ConcurrentMark* _cm; |
|
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|
1594 BitMap* _actual_region_bm; |
|
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|
1595 BitMap* _actual_card_bm; |
|
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|
1596 |
|
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|
1597 uint _n_workers; |
|
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|
1598 |
|
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|
1599 BitMap* _expected_region_bm; |
|
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|
1600 BitMap* _expected_card_bm; |
|
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|
1601 |
|
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|
1602 int _failures; |
|
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|
1603 bool _verbose; |
|
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|
1604 |
|
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|
1605 public: |
|
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|
1606 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
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|
1607 BitMap* region_bm, BitMap* card_bm, |
|
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|
1608 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
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|
1609 : AbstractGangTask("G1 verify final counting"), |
|
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|
1610 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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|
1611 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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|
1612 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
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|
1613 _failures(0), _verbose(false), |
|
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|
1614 _n_workers(0) { |
|
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|
1615 assert(VerifyDuringGC, "don't call this otherwise"); |
|
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|
1616 |
|
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|
1617 // Use the value already set as the number of active threads |
|
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|
1618 // in the call to run_task(). |
|
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|
1619 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1620 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1621 "Should have been previously set"); |
|
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|
1622 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1623 } else { |
|
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|
1624 _n_workers = 1; |
|
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|
1625 } |
|
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|
1626 |
|
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|
1627 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
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|
1628 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
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|
1629 |
|
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|
1630 _verbose = _cm->verbose_medium(); |
|
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|
1631 } |
|
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|
1632 |
|
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|
1633 void work(uint worker_id) { |
|
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|
1634 assert(worker_id < _n_workers, "invariant"); |
|
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|
1635 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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diff
changeset
|
1636 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
|
4836
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|
1637 _actual_region_bm, _actual_card_bm, |
|
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|
1638 _expected_region_bm, |
|
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changeset
|
1639 _expected_card_bm, |
|
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|
1640 _verbose); |
|
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changeset
|
1641 |
|
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changeset
|
1642 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1643 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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|
1644 worker_id, |
|
d30fa85f9994
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|
1645 _n_workers, |
|
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|
1646 HeapRegion::VerifyCountClaimValue); |
|
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diff
changeset
|
1647 } else { |
|
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diff
changeset
|
1648 _g1h->heap_region_iterate(&verify_cl); |
|
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|
1649 } |
|
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|
1650 |
|
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|
1651 Atomic::add(verify_cl.failures(), &_failures); |
|
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|
1652 } |
|
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diff
changeset
|
1653 |
|
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changeset
|
1654 int failures() const { return _failures; } |
|
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|
1655 }; |
|
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changeset
|
1656 |
|
6027
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|
1657 // Closure that finalizes the liveness counting data. |
|
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|
1658 // Used during the cleanup pause. |
|
8a2e5a6a19a4
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changeset
|
1659 // Sets the bits corresponding to the interval [NTAMS, top] |
|
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1660 // (which contains the implicitly live objects) in the |
|
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|
1661 // card liveness bitmap. Also sets the bit for each region, |
|
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|
1662 // containing live data, in the region liveness bitmap. |
|
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1663 |
|
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|
1664 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
|
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|
1665 public: |
|
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|
1666 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
|
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|
1667 BitMap* region_bm, |
|
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|
1668 BitMap* card_bm) : |
|
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|
1669 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
|
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|
1670 |
|
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|
1671 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1672 |
|
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|
1673 if (hr->continuesHumongous()) { |
|
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|
1674 // We will ignore these here and process them when their |
|
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|
1675 // associated "starts humongous" region is processed (see |
|
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|
1676 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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1677 // associated "starts humongous" region to have their bit set to |
|
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|
1678 // 1 since, due to the region chunking in the parallel region |
|
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|
1679 // iteration, a "continues humongous" region might be visited |
|
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|
1680 // before its associated "starts humongous". |
|
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|
1681 return false; |
|
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|
1682 } |
|
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|
1683 |
|
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|
1684 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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|
1685 HeapWord* top = hr->top(); |
|
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|
1686 |
|
6027
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|
1687 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
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|
1688 |
|
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|
1689 // Mark the allocated-since-marking portion... |
|
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|
1690 if (ntams < top) { |
|
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|
1691 // This definitely means the region has live objects. |
|
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|
1692 set_bit_for_region(hr); |
|
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|
1693 |
|
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|
1694 // Now set the bits in the card bitmap for [ntams, top) |
|
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|
1695 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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|
1696 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
|
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changeset
|
1697 |
|
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changeset
|
1698 // Note: if we're looking at the last region in heap - top |
|
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changeset
|
1699 // could be actually just beyond the end of the heap; end_idx |
|
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|
1700 // will then correspond to a (non-existent) card that is also |
|
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|
1701 // just beyond the heap. |
|
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|
1702 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
|
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changeset
|
1703 // end of object is not card aligned - increment to cover |
|
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changeset
|
1704 // all the cards spanned by the object |
|
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|
1705 end_idx += 1; |
|
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|
1706 } |
|
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changeset
|
1707 |
|
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changeset
|
1708 assert(end_idx <= _card_bm->size(), |
|
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changeset
|
1709 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
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changeset
|
1710 end_idx, _card_bm->size())); |
|
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|
1711 assert(start_idx < _card_bm->size(), |
|
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changeset
|
1712 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
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changeset
|
1713 start_idx, _card_bm->size())); |
|
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changeset
|
1714 |
|
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changeset
|
1715 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
6725
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|
1716 } |
|
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|
1717 |
|
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changeset
|
1718 // Set the bit for the region if it contains live data |
|
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changeset
|
1719 if (hr->next_marked_bytes() > 0) { |
|
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|
1720 set_bit_for_region(hr); |
|
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|
1721 } |
|
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changeset
|
1722 |
|
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changeset
|
1723 return false; |
|
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changeset
|
1724 } |
|
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|
1725 }; |
| 342 | 1726 |
| 1727 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1728 protected: | |
| 1729 G1CollectedHeap* _g1h; | |
|
4836
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|
1730 ConcurrentMark* _cm; |
|
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|
1731 BitMap* _actual_region_bm; |
|
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|
1732 BitMap* _actual_card_bm; |
|
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|
1733 |
|
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|
1734 uint _n_workers; |
|
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|
1735 |
| 342 | 1736 public: |
|
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|
1737 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
|
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|
1738 : AbstractGangTask("G1 final counting"), |
|
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|
1739 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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|
1740 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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|
1741 _n_workers(0) { |
|
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|
1742 // Use the value already set as the number of active threads |
| 6011 | 1743 // in the call to run_task(). |
|
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|
1744 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1745 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1746 "Should have been previously set"); |
|
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|
1747 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1748 } else { |
| 342 | 1749 _n_workers = 1; |
|
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|
1750 } |
| 342 | 1751 } |
| 1752 | |
|
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|
1753 void work(uint worker_id) { |
|
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|
1754 assert(worker_id < _n_workers, "invariant"); |
|
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|
1755 |
|
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|
1756 FinalCountDataUpdateClosure final_update_cl(_g1h, |
|
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|
1757 _actual_region_bm, |
|
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|
1758 _actual_card_bm); |
|
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|
1759 |
|
1833
8b10f48633dc
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diff
changeset
|
1760 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1761 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
|
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|
1762 worker_id, |
|
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|
1763 _n_workers, |
| 355 | 1764 HeapRegion::FinalCountClaimValue); |
| 342 | 1765 } else { |
|
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|
1766 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1767 } |
| 1768 } | |
| 1769 }; | |
| 1770 | |
| 1771 class G1ParNoteEndTask; | |
| 1772 | |
| 1773 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1774 G1CollectedHeap* _g1; | |
| 1775 int _worker_num; | |
| 1776 size_t _max_live_bytes; | |
|
6010
720b6a76dd9d
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|
1777 uint _regions_claimed; |
| 342 | 1778 size_t _freed_bytes; |
| 2173 | 1779 FreeRegionList* _local_cleanup_list; |
| 4072 | 1780 OldRegionSet* _old_proxy_set; |
| 2173 | 1781 HumongousRegionSet* _humongous_proxy_set; |
| 1782 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1783 double _claimed_region_time; |
| 1784 double _max_region_time; | |
| 1785 | |
| 1786 public: | |
| 1787 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1788 int worker_num, |
| 1789 FreeRegionList* local_cleanup_list, | |
| 4072 | 1790 OldRegionSet* old_proxy_set, |
| 2173 | 1791 HumongousRegionSet* humongous_proxy_set, |
|
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|
1792 HRRSCleanupTask* hrrs_cleanup_task) : |
|
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|
1793 _g1(g1), _worker_num(worker_num), |
|
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|
1794 _max_live_bytes(0), _regions_claimed(0), |
|
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|
1795 _freed_bytes(0), |
|
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|
1796 _claimed_region_time(0.0), _max_region_time(0.0), |
|
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|
1797 _local_cleanup_list(local_cleanup_list), |
|
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|
1798 _old_proxy_set(old_proxy_set), |
|
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|
1799 _humongous_proxy_set(humongous_proxy_set), |
|
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|
1800 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
|
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|
1801 |
| 342 | 1802 size_t freed_bytes() { return _freed_bytes; } |
| 1803 | |
|
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|
1804 bool doHeapRegion(HeapRegion *hr) { |
|
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|
1805 if (hr->continuesHumongous()) { |
|
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1806 return false; |
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1807 } |
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1808 // We use a claim value of zero here because all regions |
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1809 // were claimed with value 1 in the FinalCount task. |
|
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1810 _g1->reset_gc_time_stamps(hr); |
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1811 double start = os::elapsedTime(); |
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1812 _regions_claimed++; |
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1813 hr->note_end_of_marking(); |
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1814 _max_live_bytes += hr->max_live_bytes(); |
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1815 _g1->free_region_if_empty(hr, |
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1816 &_freed_bytes, |
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1817 _local_cleanup_list, |
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1818 _old_proxy_set, |
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1819 _humongous_proxy_set, |
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1820 _hrrs_cleanup_task, |
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1821 true /* par */); |
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1822 double region_time = (os::elapsedTime() - start); |
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1823 _claimed_region_time += region_time; |
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1824 if (region_time > _max_region_time) { |
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1825 _max_region_time = region_time; |
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1826 } |
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1827 return false; |
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1828 } |
| 342 | 1829 |
| 1830 size_t max_live_bytes() { return _max_live_bytes; } | |
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1831 uint regions_claimed() { return _regions_claimed; } |
| 342 | 1832 double claimed_region_time_sec() { return _claimed_region_time; } |
| 1833 double max_region_time_sec() { return _max_region_time; } | |
| 1834 }; | |
| 1835 | |
| 1836 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1837 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1838 |
| 342 | 1839 protected: |
| 1840 G1CollectedHeap* _g1h; | |
| 1841 size_t _max_live_bytes; | |
| 1842 size_t _freed_bytes; | |
| 2152 | 1843 FreeRegionList* _cleanup_list; |
| 1844 | |
| 342 | 1845 public: |
| 1846 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1847 FreeRegionList* cleanup_list) : |
| 342 | 1848 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1849 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1850 |
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1851 void work(uint worker_id) { |
| 342 | 1852 double start = os::elapsedTime(); |
| 2173 | 1853 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1854 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1855 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1856 HRRSCleanupTask hrrs_cleanup_task; | |
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1857 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1858 &old_proxy_set, |
| 2173 | 1859 &humongous_proxy_set, |
| 1860 &hrrs_cleanup_task); | |
|
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1861 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1862 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1863 _g1h->workers()->active_workers(), |
| 355 | 1864 HeapRegion::NoteEndClaimValue); |
| 342 | 1865 } else { |
| 1866 _g1h->heap_region_iterate(&g1_note_end); | |
| 1867 } | |
| 1868 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1869 | |
| 2152 | 1870 // Now update the lists |
| 1871 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1872 NULL /* free_list */, | |
| 4072 | 1873 &old_proxy_set, |
| 2173 | 1874 &humongous_proxy_set, |
| 2152 | 1875 true /* par */); |
| 342 | 1876 { |
| 1877 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1878 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1879 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1880 |
|
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1881 // If we iterate over the global cleanup list at the end of |
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1882 // cleanup to do this printing we will not guarantee to only |
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1883 // generate output for the newly-reclaimed regions (the list |
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1884 // might not be empty at the beginning of cleanup; we might |
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1885 // still be working on its previous contents). So we do the |
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1886 // printing here, before we append the new regions to the global |
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1887 // cleanup list. |
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1888 |
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1889 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1890 if (hr_printer->is_active()) { |
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1891 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1892 while (iter.more_available()) { |
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1893 HeapRegion* hr = iter.get_next(); |
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1894 hr_printer->cleanup(hr); |
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1895 } |
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1896 } |
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1897 |
| 2173 | 1898 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1899 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1900 | |
| 1901 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1902 } |
| 1903 } | |
| 1904 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1905 size_t freed_bytes() { return _freed_bytes; } | |
| 1906 }; | |
| 1907 | |
| 1908 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1909 protected: | |
| 1910 G1RemSet* _g1rs; | |
| 1911 BitMap* _region_bm; | |
| 1912 BitMap* _card_bm; | |
| 1913 public: | |
| 1914 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1915 BitMap* region_bm, BitMap* card_bm) : | |
| 1916 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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1917 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 1918 |
|
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1919 void work(uint worker_id) { |
|
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1920 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1921 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1922 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1923 } else { |
| 1924 _g1rs->scrub(_region_bm, _card_bm); | |
| 1925 } | |
| 1926 } | |
| 1927 | |
| 1928 }; | |
| 1929 | |
| 1930 void ConcurrentMark::cleanup() { | |
| 1931 // world is stopped at this checkpoint | |
| 1932 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1933 "world should be stopped"); | |
| 1934 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1935 | |
| 1936 // If a full collection has happened, we shouldn't do this. | |
| 1937 if (has_aborted()) { | |
| 1938 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1939 return; | |
| 1940 } | |
| 1941 | |
| 4072 | 1942 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1943 g1h->verify_region_sets_optional(); |
| 1944 | |
|
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1945 if (VerifyDuringGC) { |
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1946 HandleMark hm; // handle scope |
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1947 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1948 Universe::heap()->prepare_for_verify(); |
|
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1949 Universe::verify(/* silent */ false, |
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1950 /* option */ VerifyOption_G1UsePrevMarking); |
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1951 } |
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1952 |
| 342 | 1953 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1954 g1p->record_concurrent_mark_cleanup_start(); | |
| 1955 | |
| 1956 double start = os::elapsedTime(); | |
| 1957 | |
| 2173 | 1958 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1959 | |
|
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1960 uint n_workers; |
|
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1961 |
| 342 | 1962 // Do counting once more with the world stopped for good measure. |
|
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1963 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1964 |
|
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1965 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1966 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 1967 "sanity check"); |
| 1968 | |
| 4711 | 1969 g1h->set_par_threads(); |
| 1970 n_workers = g1h->n_par_threads(); | |
|
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1971 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1972 "Should not have been reset"); |
| 342 | 1973 g1h->workers()->run_task(&g1_par_count_task); |
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1974 // Done with the parallel phase so reset to 0. |
| 342 | 1975 g1h->set_par_threads(0); |
| 355 | 1976 |
|
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1977 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 1978 "sanity check"); |
| 342 | 1979 } else { |
| 4711 | 1980 n_workers = 1; |
| 342 | 1981 g1_par_count_task.work(0); |
| 1982 } | |
| 1983 | |
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1984 if (VerifyDuringGC) { |
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1985 // Verify that the counting data accumulated during marking matches |
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1986 // that calculated by walking the marking bitmap. |
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1987 |
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1988 // Bitmaps to hold expected values |
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1989 BitMap expected_region_bm(_region_bm.size(), false); |
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1990 BitMap expected_card_bm(_card_bm.size(), false); |
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1991 |
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1992 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1993 &_region_bm, |
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1994 &_card_bm, |
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1995 &expected_region_bm, |
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1996 &expected_card_bm); |
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1997 |
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1998 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1999 g1h->set_par_threads((int)n_workers); |
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2000 g1h->workers()->run_task(&g1_par_verify_task); |
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2001 // Done with the parallel phase so reset to 0. |
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2002 g1h->set_par_threads(0); |
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2003 |
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2004 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2005 "sanity check"); |
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2006 } else { |
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2007 g1_par_verify_task.work(0); |
|
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2008 } |
|
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2009 |
|
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2010 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
|
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2011 } |
|
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|
2012 |
| 342 | 2013 size_t start_used_bytes = g1h->used(); |
| 2014 g1h->set_marking_complete(); | |
| 2015 | |
| 2016 double count_end = os::elapsedTime(); | |
| 2017 double this_final_counting_time = (count_end - start); | |
| 2018 _total_counting_time += this_final_counting_time; | |
| 2019 | |
|
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|
2020 if (G1PrintRegionLivenessInfo) { |
|
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|
2021 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
|
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|
2022 _g1h->heap_region_iterate(&cl); |
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2023 } |
|
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|
2024 |
| 342 | 2025 // Install newly created mark bitMap as "prev". |
| 2026 swapMarkBitMaps(); | |
| 2027 | |
| 2028 g1h->reset_gc_time_stamp(); | |
| 2029 | |
| 2030 // Note end of marking in all heap regions. | |
| 2152 | 2031 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
1833
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|
2032 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2033 g1h->set_par_threads((int)n_workers); |
| 342 | 2034 g1h->workers()->run_task(&g1_par_note_end_task); |
| 2035 g1h->set_par_threads(0); | |
| 355 | 2036 |
| 2037 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 2038 "sanity check"); | |
| 342 | 2039 } else { |
| 2040 g1_par_note_end_task.work(0); | |
| 2041 } | |
|
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|
2042 g1h->check_gc_time_stamps(); |
| 2152 | 2043 |
| 2044 if (!cleanup_list_is_empty()) { | |
| 2045 // The cleanup list is not empty, so we'll have to process it | |
| 2046 // concurrently. Notify anyone else that might be wanting free | |
| 2047 // regions that there will be more free regions coming soon. | |
| 2048 g1h->set_free_regions_coming(); | |
| 2049 } | |
| 342 | 2050 |
| 2051 // call below, since it affects the metric by which we sort the heap | |
| 2052 // regions. | |
| 2053 if (G1ScrubRemSets) { | |
| 2054 double rs_scrub_start = os::elapsedTime(); | |
| 2055 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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|
2056 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2057 g1h->set_par_threads((int)n_workers); |
| 342 | 2058 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 2059 g1h->set_par_threads(0); | |
| 355 | 2060 |
| 2061 assert(g1h->check_heap_region_claim_values( | |
| 2062 HeapRegion::ScrubRemSetClaimValue), | |
| 2063 "sanity check"); | |
| 342 | 2064 } else { |
| 2065 g1_par_scrub_rs_task.work(0); | |
| 2066 } | |
| 2067 | |
| 2068 double rs_scrub_end = os::elapsedTime(); | |
| 2069 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 2070 _total_rs_scrub_time += this_rs_scrub_time; | |
| 2071 } | |
| 2072 | |
| 2073 // this will also free any regions totally full of garbage objects, | |
| 2074 // and sort the regions. | |
|
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|
2075 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 2076 |
| 2077 // Statistics. | |
| 2078 double end = os::elapsedTime(); | |
| 2079 _cleanup_times.add((end - start) * 1000.0); | |
| 2080 | |
|
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|
2081 if (G1Log::fine()) { |
| 342 | 2082 g1h->print_size_transition(gclog_or_tty, |
| 2083 start_used_bytes, | |
| 2084 g1h->used(), | |
| 2085 g1h->capacity()); | |
| 2086 } | |
| 2087 | |
|
3979
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|
2088 // Clean up will have freed any regions completely full of garbage. |
|
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|
2089 // Update the soft reference policy with the new heap occupancy. |
|
4dfb2df418f2
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|
2090 Universe::update_heap_info_at_gc(); |
|
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|
2091 |
| 342 | 2092 // We need to make this be a "collection" so any collection pause that |
| 2093 // races with it goes around and waits for completeCleanup to finish. | |
| 2094 g1h->increment_total_collections(); | |
| 2095 | |
|
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|
2096 // We reclaimed old regions so we should calculate the sizes to make |
|
0b3d1ec6eaee
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|
2097 // sure we update the old gen/space data. |
|
0b3d1ec6eaee
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|
2098 g1h->g1mm()->update_sizes(); |
|
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|
2099 |
| 751 | 2100 if (VerifyDuringGC) { |
|
845
df6caf649ff7
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|
2101 HandleMark hm; // handle scope |
|
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|
2102 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
|
df6caf649ff7
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|
2103 Universe::heap()->prepare_for_verify(); |
|
6865
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diff
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|
2104 Universe::verify(/* silent */ false, |
|
4202510ee0fe
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6862
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|
2105 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 2106 } |
| 2152 | 2107 |
| 2108 g1h->verify_region_sets_optional(); | |
| 342 | 2109 } |
| 2110 | |
| 2111 void ConcurrentMark::completeCleanup() { | |
| 2112 if (has_aborted()) return; | |
| 2113 | |
| 2152 | 2114 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 2115 | |
| 2116 _cleanup_list.verify_optional(); | |
| 2361 | 2117 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 2118 |
| 2119 if (G1ConcRegionFreeingVerbose) { | |
| 2120 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
6010
720b6a76dd9d
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diff
changeset
|
2121 "cleanup list has %u entries", |
| 2152 | 2122 _cleanup_list.length()); |
| 2123 } | |
| 2124 | |
| 2125 // Noone else should be accessing the _cleanup_list at this point, | |
| 2126 // so it's not necessary to take any locks | |
| 2127 while (!_cleanup_list.is_empty()) { | |
| 2128 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 2129 assert(hr != NULL, "the list was not empty"); | |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3316
diff
changeset
|
2130 hr->par_clear(); |
| 2361 | 2131 tmp_free_list.add_as_tail(hr); |
| 2152 | 2132 |
| 2133 // Instead of adding one region at a time to the secondary_free_list, | |
| 2134 // we accumulate them in the local list and move them a few at a | |
| 2135 // time. This also cuts down on the number of notify_all() calls | |
| 2136 // we do during this process. We'll also append the local list when | |
| 2137 // _cleanup_list is empty (which means we just removed the last | |
| 2138 // region from the _cleanup_list). | |
| 2361 | 2139 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 2140 _cleanup_list.is_empty()) { |
| 2141 if (G1ConcRegionFreeingVerbose) { | |
| 2142 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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diff
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|
2143 "appending %u entries to the secondary_free_list, " |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
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|
2144 "cleanup list still has %u entries", |
| 2361 | 2145 tmp_free_list.length(), |
| 2152 | 2146 _cleanup_list.length()); |
| 342 | 2147 } |
| 2152 | 2148 |
| 2149 { | |
| 2150 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 2151 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 2152 SecondaryFreeList_lock->notify_all(); |
| 2153 } | |
| 2154 | |
| 2155 if (G1StressConcRegionFreeing) { | |
| 2156 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 2157 os::sleep(Thread::current(), (jlong) 1, false); | |
| 2158 } | |
| 2159 } | |
| 342 | 2160 } |
| 2161 } | |
| 2361 | 2162 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2163 } |
| 2164 | |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2165 // Supporting Object and Oop closures for reference discovery |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2166 // and processing in during marking |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2167 |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2168 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2169 HeapWord* addr = (HeapWord*)obj; |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2170 return addr != NULL && |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2171 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2172 } |
| 342 | 2173 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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parents:
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diff
changeset
|
2174 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2175 // Uses the CMTask associated with a worker thread (for serial reference |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2176 // processing the CMTask for worker 0 is used) to preserve (mark) and |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
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|
2177 // trace referent objects. |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
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|
2178 // |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
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|
2179 // Using the CMTask and embedded local queues avoids having the worker |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2180 // 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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diff
changeset
|
2181 // of overflowing the stack - which we would rather avoid at this late |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
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|
2182 // state. Also using the tasks' local queues removes the potential |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2183 // 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
|
2184 // operating on the global stack. |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
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|
2185 |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2186 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2187 ConcurrentMark* _cm; |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2188 CMTask* _task; |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2189 int _ref_counter_limit; |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2190 int _ref_counter; |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2191 bool _is_serial; |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2192 public: |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2193 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
2194 _cm(cm), _task(task), _is_serial(is_serial), |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
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|
2195 _ref_counter_limit(G1RefProcDrainInterval) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2196 assert(_ref_counter_limit > 0, "sanity"); |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
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|
2197 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2198 _ref_counter = _ref_counter_limit; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2199 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2200 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2201 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
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|
2202 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
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|
2203 |
|
234761c55641
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2152
diff
changeset
|
2204 template <class T> void do_oop_work(T* p) { |
|
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2205 if (!_cm->has_overflown()) { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2206 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
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|
2207 if (_cm->verbose_high()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
2208 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
|
2174
234761c55641
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2152
diff
changeset
|
2209 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2210 _task->worker_id(), p, (void*) obj); |
|
3776
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3772
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|
2211 } |
|
2174
234761c55641
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2152
diff
changeset
|
2212 |
|
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2213 _task->deal_with_reference(obj); |
|
234761c55641
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johnc
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2152
diff
changeset
|
2214 _ref_counter--; |
|
234761c55641
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2152
diff
changeset
|
2215 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2216 if (_ref_counter == 0) { |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2217 // We have dealt with _ref_counter_limit references, pushing them |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2218 // and objects reachable from them on to the local stack (and |
|
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2219 // possibly the global stack). Call CMTask::do_marking_step() to |
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2220 // process these entries. |
|
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|
2221 // |
|
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|
2222 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
|
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2223 // there's nothing more to do (i.e. we're done with the entries that |
|
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2224 // were pushed as a result of the CMTask::deal_with_reference() calls |
|
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|
2225 // above) or we overflow. |
|
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|
2226 // |
|
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|
2227 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
|
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|
2228 // flag while there may still be some work to do. (See the comment at |
|
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|
2229 // the beginning of CMTask::do_marking_step() for those conditions - |
|
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|
2230 // one of which is reaching the specified time target.) It is only |
|
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|
2231 // when CMTask::do_marking_step() returns without setting the |
|
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2232 // has_aborted() flag that the marking step has completed. |
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2233 do { |
|
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2234 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2235 _task->do_marking_step(mark_step_duration_ms, |
|
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|
2236 false /* do_termination */, |
|
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|
2237 _is_serial); |
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2238 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2239 _ref_counter = _ref_counter_limit; |
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2240 } |
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2241 } else { |
|
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|
2242 if (_cm->verbose_high()) { |
|
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2243 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
|
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2244 } |
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2245 } |
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|
2246 } |
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|
2247 }; |
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2248 |
|
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2249 // 'Drain' oop closure used by both serial and parallel reference processing. |
|
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|
2250 // Uses the CMTask associated with a given worker thread (for serial |
|
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|
2251 // reference processing the CMtask for worker 0 is used). Calls the |
|
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|
2252 // do_marking_step routine, with an unbelievably large timeout value, |
|
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|
2253 // to drain the marking data structures of the remaining entries |
|
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|
2254 // added by the 'keep alive' oop closure above. |
|
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|
2255 |
|
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|
2256 class G1CMDrainMarkingStackClosure: public VoidClosure { |
|
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2257 ConcurrentMark* _cm; |
|
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|
2258 CMTask* _task; |
|
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|
2259 bool _is_serial; |
|
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|
2260 public: |
|
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|
2261 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
|
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2262 _cm(cm), _task(task), _is_serial(is_serial) { |
|
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|
2263 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
|
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|
2264 } |
|
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|
2265 |
|
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|
2266 void do_void() { |
|
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|
2267 do { |
|
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|
2268 if (_cm->verbose_high()) { |
|
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|
2269 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
|
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2270 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
|
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|
2271 } |
|
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|
2272 |
|
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|
2273 // We call CMTask::do_marking_step() to completely drain the local |
|
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|
2274 // and global marking stacks of entries pushed by the 'keep alive' |
|
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|
2275 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
|
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|
2276 // |
|
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|
2277 // CMTask::do_marking_step() is called in a loop, which we'll exit |
|
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|
2278 // if there's nothing more to do (i.e. we'completely drained the |
|
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|
2279 // entries that were pushed as a a result of applying the 'keep alive' |
|
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|
2280 // closure to the entries on the discovered ref lists) or we overflow |
|
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|
2281 // the global marking stack. |
|
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|
2282 // |
|
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|
2283 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
|
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|
2284 // flag while there may still be some work to do. (See the comment at |
|
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|
2285 // the beginning of CMTask::do_marking_step() for those conditions - |
|
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|
2286 // one of which is reaching the specified time target.) It is only |
|
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|
2287 // when CMTask::do_marking_step() returns without setting the |
|
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|
2288 // has_aborted() flag that the marking step has completed. |
|
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|
2289 |
|
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|
2290 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2291 true /* do_termination */, |
|
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|
2292 _is_serial); |
|
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|
2293 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2294 } |
|
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|
2295 }; |
|
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|
2296 |
|
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|
2297 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2298 // reference processing at the end of G1 concurrent marking |
|
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|
2299 |
|
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|
2300 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2301 private: |
|
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|
2302 G1CollectedHeap* _g1h; |
|
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|
2303 ConcurrentMark* _cm; |
|
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|
2304 WorkGang* _workers; |
|
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|
2305 int _active_workers; |
|
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|
2306 |
|
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|
2307 public: |
|
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|
2308 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
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|
2309 ConcurrentMark* cm, |
|
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|
2310 WorkGang* workers, |
|
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|
2311 int n_workers) : |
|
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|
2312 _g1h(g1h), _cm(cm), |
|
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|
2313 _workers(workers), _active_workers(n_workers) { } |
|
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|
2314 |
|
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|
2315 // Executes the given task using concurrent marking worker threads. |
|
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|
2316 virtual void execute(ProcessTask& task); |
|
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|
2317 virtual void execute(EnqueueTask& task); |
|
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|
2318 }; |
|
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|
2319 |
|
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|
2320 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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|
2321 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2322 ProcessTask& _proc_task; |
|
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|
2323 G1CollectedHeap* _g1h; |
|
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|
2324 ConcurrentMark* _cm; |
|
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|
2325 |
|
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|
2326 public: |
|
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|
2327 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
2328 G1CollectedHeap* g1h, |
|
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|
2329 ConcurrentMark* cm) : |
|
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|
2330 AbstractGangTask("Process reference objects in parallel"), |
|
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|
2331 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
|
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|
2332 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
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|
2333 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
|
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|
2334 } |
|
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|
2335 |
|
4728
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|
2336 virtual void work(uint worker_id) { |
|
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|
2337 CMTask* task = _cm->task(worker_id); |
|
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|
2338 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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|
2339 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
|
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|
2340 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
|
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2341 |
|
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|
2342 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
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|
2343 } |
|
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|
2344 }; |
|
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|
2345 |
|
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|
2346 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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|
2347 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2348 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
|
2174
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|
2349 |
|
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2350 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
2174
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|
2351 |
|
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|
2352 // We need to reset the phase for each task execution so that |
|
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|
2353 // the termination protocol of CMTask::do_marking_step works. |
|
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|
2354 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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|
2355 _g1h->set_par_threads(_active_workers); |
|
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|
2356 _workers->run_task(&proc_task_proxy); |
|
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|
2357 _g1h->set_par_threads(0); |
|
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|
2358 } |
|
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|
2359 |
|
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|
2360 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
2174
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|
2361 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
2362 EnqueueTask& _enq_task; |
|
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|
2363 |
|
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|
2364 public: |
|
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|
2365 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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|
2366 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
2367 _enq_task(enq_task) { } |
|
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|
2368 |
|
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|
2369 virtual void work(uint worker_id) { |
|
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|
2370 _enq_task.work(worker_id); |
|
2174
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|
2371 } |
|
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|
2372 }; |
|
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|
2373 |
|
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|
2374 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
2174
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|
2375 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2376 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
|
2174
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|
2377 |
|
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|
2378 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
2174
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|
2379 |
|
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|
2380 _g1h->set_par_threads(_active_workers); |
|
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|
2381 _workers->run_task(&enq_task_proxy); |
|
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|
2382 _g1h->set_par_threads(0); |
|
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|
2383 } |
|
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|
2384 |
| 342 | 2385 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2386 ResourceMark rm; | |
| 2387 HandleMark hm; | |
|
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|
2388 |
|
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|
2389 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
2390 |
|
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|
2391 // Is alive closure. |
|
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|
2392 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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|
2393 |
|
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|
2394 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2395 // tables from the displayed time. |
|
1847b501ae74
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|
2396 { |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
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diff
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|
2397 if (G1Log::finer()) { |
|
3975
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|
2398 gclog_or_tty->put(' '); |
|
1847b501ae74
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|
2399 } |
|
6007
5c86f8211d1e
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diff
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|
2400 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
|
3975
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|
2401 |
|
3979
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|
2402 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
3975
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|
2403 |
|
1847b501ae74
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|
2404 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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|
2405 // about how reference processing currently works in G1. |
|
1847b501ae74
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|
2406 |
|
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|
2407 // Set the soft reference policy |
|
3975
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|
2408 rp->setup_policy(clear_all_soft_refs); |
|
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|
2409 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
1847b501ae74
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|
2410 |
|
8787
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|
2411 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
|
fa08949fe0cb
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diff
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|
2412 // in serial reference processing. Note these closures are also |
|
fa08949fe0cb
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diff
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|
2413 // used for serially processing (by the the current thread) the |
|
fa08949fe0cb
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diff
changeset
|
2414 // JNI references during parallel reference processing. |
|
fa08949fe0cb
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8744
diff
changeset
|
2415 // |
|
fa08949fe0cb
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diff
changeset
|
2416 // These closures do not need to synchronize with the worker |
|
fa08949fe0cb
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8744
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|
2417 // threads involved in parallel reference processing as these |
|
fa08949fe0cb
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diff
changeset
|
2418 // instances are executed serially by the current thread (e.g. |
|
fa08949fe0cb
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|
2419 // reference processing is not multi-threaded and is thus |
|
fa08949fe0cb
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|
2420 // performed by the current thread instead of a gang worker). |
|
fa08949fe0cb
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diff
changeset
|
2421 // |
|
fa08949fe0cb
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diff
changeset
|
2422 // The gang tasks involved in parallel reference procssing create |
|
fa08949fe0cb
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|
2423 // their own instances of these closures, which do their own |
|
fa08949fe0cb
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diff
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|
2424 // synchronization among themselves. |
|
fa08949fe0cb
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diff
changeset
|
2425 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
|
fa08949fe0cb
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|
2426 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
|
fa08949fe0cb
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diff
changeset
|
2427 |
|
fa08949fe0cb
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diff
changeset
|
2428 // We need at least one active thread. If reference processing |
|
fa08949fe0cb
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diff
changeset
|
2429 // is not multi-threaded we use the current (VMThread) thread, |
|
fa08949fe0cb
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diff
changeset
|
2430 // otherwise we use the work gang from the G1CollectedHeap and |
|
fa08949fe0cb
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8744
diff
changeset
|
2431 // we utilize all the worker threads we can. |
|
fa08949fe0cb
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changeset
|
2432 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
|
fa08949fe0cb
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|
2433 uint active_workers = (processing_is_mt ? g1h->workers()->active_workers() : 1U); |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
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|
2434 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
|
3975
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|
2435 |
|
8787
fa08949fe0cb
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|
2436 // Parallel processing task executor. |
|
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|
2437 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2438 g1h->workers(), active_workers); |
|
8787
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|
2439 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
|
8014
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|
2440 |
|
f90b9bceb8e5
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changeset
|
2441 // Set the degree of MT processing here. If the discovery was done MT, |
|
f90b9bceb8e5
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changeset
|
2442 // the number of threads involved during discovery could differ from |
|
f90b9bceb8e5
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diff
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|
2443 // the number of active workers. This is OK as long as the discovered |
|
f90b9bceb8e5
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|
2444 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
|
f90b9bceb8e5
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changeset
|
2445 rp->set_active_mt_degree(active_workers); |
|
f90b9bceb8e5
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8008
diff
changeset
|
2446 |
|
f90b9bceb8e5
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changeset
|
2447 // Process the weak references. |
|
f90b9bceb8e5
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changeset
|
2448 rp->process_discovered_references(&g1_is_alive, |
|
2174
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|
2449 &g1_keep_alive, |
|
234761c55641
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changeset
|
2450 &g1_drain_mark_stack, |
|
8014
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8008
diff
changeset
|
2451 executor); |
|
f90b9bceb8e5
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8008
diff
changeset
|
2452 |
|
f90b9bceb8e5
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8008
diff
changeset
|
2453 // The do_oop work routines of the keep_alive and drain_marking_stack |
|
f90b9bceb8e5
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diff
changeset
|
2454 // oop closures will set the has_overflown flag if we overflow the |
|
f90b9bceb8e5
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8008
diff
changeset
|
2455 // global marking stack. |
|
3975
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changeset
|
2456 |
|
1847b501ae74
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changeset
|
2457 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
1847b501ae74
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changeset
|
2458 "mark stack should be empty (unless it overflowed)"); |
|
8787
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changeset
|
2459 |
|
3975
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changeset
|
2460 if (_markStack.overflow()) { |
|
8014
f90b9bceb8e5
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8008
diff
changeset
|
2461 // This should have been done already when we tried to push an |
|
3975
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changeset
|
2462 // entry on to the global mark stack. But let's do it again. |
|
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|
2463 set_has_overflown(); |
|
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|
2464 } |
|
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diff
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|
2465 |
|
8014
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8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2466 assert(rp->num_q() == active_workers, "why not"); |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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|
2467 |
|
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|
2468 rp->enqueue_discovered_references(executor); |
|
3975
1847b501ae74
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|
2469 |
|
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|
2470 rp->verify_no_references_recorded(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2471 assert(!rp->discovery_enabled(), "Post condition"); |
|
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|
2472 } |
|
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6608385: G1: need to support parallel reference processing
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|
2473 |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
changeset
|
2474 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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|
2475 StringTable::unlink(&g1_is_alive); |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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|
2476 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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|
2477 SymbolTable::unlink(); |
| 342 | 2478 } |
| 2479 | |
| 2480 void ConcurrentMark::swapMarkBitMaps() { | |
| 2481 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2482 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2483 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2484 } | |
| 2485 | |
| 2486 class CMRemarkTask: public AbstractGangTask { | |
| 2487 private: | |
|
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|
2488 ConcurrentMark* _cm; |
|
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|
2489 bool _is_serial; |
| 342 | 2490 public: |
|
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7121618: Change type of number of GC workers to unsigned int.
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|
2491 void work(uint worker_id) { |
| 342 | 2492 // Since all available tasks are actually started, we should |
| 2493 // only proceed if we're supposed to be actived. | |
|
4728
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|
2494 if (worker_id < _cm->active_tasks()) { |
|
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|
2495 CMTask* task = _cm->task(worker_id); |
| 342 | 2496 task->record_start_time(); |
| 2497 do { | |
|
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|
2498 task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2499 true /* do_termination */, |
|
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|
2500 _is_serial); |
| 342 | 2501 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2502 // If we overflow, then we do not want to restart. We instead | |
| 2503 // want to abort remark and do concurrent marking again. | |
| 2504 task->record_end_time(); | |
| 2505 } | |
| 2506 } | |
| 2507 | |
|
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|
2508 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
|
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|
2509 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
| 4711 | 2510 _cm->terminator()->reset_for_reuse(active_workers); |
|
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|
2511 } |
| 342 | 2512 }; |
| 2513 | |
| 2514 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2515 ResourceMark rm; | |
| 2516 HandleMark hm; | |
| 2517 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2518 | |
| 2519 g1h->ensure_parsability(false); | |
| 2520 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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diff
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|
2521 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2522 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4095
bca17e38de00
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diff
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|
2523 // this is remark, so we'll use up all active threads |
|
4728
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|
2524 uint active_workers = g1h->workers()->active_workers(); |
|
4095
bca17e38de00
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diff
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|
2525 if (active_workers == 0) { |
|
bca17e38de00
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diff
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|
2526 assert(active_workers > 0, "Should have been set earlier"); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
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|
2527 active_workers = (uint) ParallelGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4093
diff
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|
2528 g1h->workers()->set_active_workers(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
2529 } |
|
2174
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|
2530 set_phase(active_workers, false /* concurrent */); |
|
4095
bca17e38de00
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diff
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|
2531 // Leave _parallel_marking_threads at it's |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4093
diff
changeset
|
2532 // value originally calculated in the ConcurrentMark |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4093
diff
changeset
|
2533 // constructor and pass values of the active workers |
|
bca17e38de00
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diff
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|
2534 // through the gang in the task. |
| 342 | 2535 |
|
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|
2536 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
|
fa08949fe0cb
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|
2537 // We will start all available threads, even if we decide that the |
|
fa08949fe0cb
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diff
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|
2538 // active_workers will be fewer. The extra ones will just bail out |
|
fa08949fe0cb
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diff
changeset
|
2539 // immediately. |
|
4095
bca17e38de00
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diff
changeset
|
2540 g1h->set_par_threads(active_workers); |
| 342 | 2541 g1h->workers()->run_task(&remarkTask); |
| 2542 g1h->set_par_threads(0); | |
| 2543 } else { | |
|
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6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
2544 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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changeset
|
2545 uint active_workers = 1; |
|
2174
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|
2546 set_phase(active_workers, false /* concurrent */); |
| 342 | 2547 |
|
8787
fa08949fe0cb
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diff
changeset
|
2548 // Note - if there's no work gang then the VMThread will be |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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diff
changeset
|
2549 // the thread to execute the remark - serially. We have |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
2550 // to pass true for the is_serial parameter so that |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
2551 // CMTask::do_marking_step() doesn't enter the sync |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
2552 // barriers in the event of an overflow. Doing so will |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2553 // cause an assert that the current thread is not a |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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diff
changeset
|
2554 // concurrent GC thread. |
|
fa08949fe0cb
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diff
changeset
|
2555 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
| 342 | 2556 remarkTask.work(0); |
| 2557 } | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
2558 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2559 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2560 |
| 2561 print_stats(); | |
| 2562 } | |
| 2563 | |
| 1044 | 2564 #ifndef PRODUCT |
| 2565 | |
| 1388 | 2566 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2567 private: |
| 2568 G1CollectedHeap* _g1h; | |
| 2569 outputStream* _out; | |
|
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7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2570 VerifyOption _vo; |
| 1388 | 2571 bool _all; |
| 342 | 2572 |
| 2573 public: | |
|
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7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2574 PrintReachableOopClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2575 VerifyOption vo, |
| 1388 | 2576 bool all) : |
| 1044 | 2577 _g1h(G1CollectedHeap::heap()), |
|
3772
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7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2578 _out(out), _vo(vo), _all(all) { } |
| 342 | 2579 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
changeset
|
2580 void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
changeset
|
2581 void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
changeset
|
2582 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
changeset
|
2583 template <class T> void do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
changeset
|
2584 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2585 const char* str = NULL; |
| 2586 const char* str2 = ""; | |
| 2587 | |
| 1388 | 2588 if (obj == NULL) { |
| 2589 str = ""; | |
| 2590 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2591 str = " O"; | |
| 2592 } else { | |
| 342 | 2593 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
1023
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6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
2594 guarantee(hr != NULL, "invariant"); |
|
6254
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7114678: G1: various small fixes, code cleanup, and refactoring
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changeset
|
2595 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
|
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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changeset
|
2596 bool marked = _g1h->is_marked(obj, _vo); |
| 1044 | 2597 |
| 2598 if (over_tams) { | |
| 1388 | 2599 str = " >"; |
| 2600 if (marked) { | |
| 342 | 2601 str2 = " AND MARKED"; |
| 1044 | 2602 } |
| 1388 | 2603 } else if (marked) { |
| 2604 str = " M"; | |
| 1044 | 2605 } else { |
| 1388 | 2606 str = " NOT"; |
| 1044 | 2607 } |
| 342 | 2608 } |
| 2609 | |
| 1388 | 2610 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2611 p, (void*) obj, str, str2); |
| 2612 } | |
| 2613 }; | |
| 2614 | |
| 1388 | 2615 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2616 private: |
|
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changeset
|
2617 G1CollectedHeap* _g1h; |
|
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7004681: G1: Extend marking verification to Full GCs
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3771
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changeset
|
2618 outputStream* _out; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
2619 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
2620 bool _all; |
|
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changeset
|
2621 HeapRegion* _hr; |
| 342 | 2622 |
| 2623 public: | |
|
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changeset
|
2624 PrintReachableObjectClosure(outputStream* out, |
|
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diff
changeset
|
2625 VerifyOption vo, |
| 1388 | 2626 bool all, |
| 2627 HeapRegion* hr) : | |
|
3772
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changeset
|
2628 _g1h(G1CollectedHeap::heap()), |
|
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changeset
|
2629 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2630 |
| 2631 void do_object(oop o) { | |
|
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|
2632 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
|
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changeset
|
2633 bool marked = _g1h->is_marked(o, _vo); |
| 1388 | 2634 bool print_it = _all || over_tams || marked; |
| 2635 | |
| 2636 if (print_it) { | |
| 2637 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2638 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
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|
2639 PrintReachableOopClosure oopCl(_out, _vo, _all); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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changeset
|
2640 o->oop_iterate_no_header(&oopCl); |
| 1388 | 2641 } |
| 342 | 2642 } |
| 2643 }; | |
| 2644 | |
| 1388 | 2645 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2646 private: |
|
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|
2647 G1CollectedHeap* _g1h; |
|
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|
2648 outputStream* _out; |
|
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|
2649 VerifyOption _vo; |
|
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|
2650 bool _all; |
| 342 | 2651 |
| 2652 public: | |
| 2653 bool doHeapRegion(HeapRegion* hr) { | |
| 2654 HeapWord* b = hr->bottom(); | |
| 2655 HeapWord* e = hr->end(); | |
| 2656 HeapWord* t = hr->top(); | |
|
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|
2657 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
| 342 | 2658 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2659 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2660 _out->cr(); |
| 2661 | |
| 2662 HeapWord* from = b; | |
| 2663 HeapWord* to = t; | |
| 2664 | |
| 2665 if (to > from) { | |
| 2666 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2667 _out->cr(); | |
|
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changeset
|
2668 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2669 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2670 _out->cr(); | |
| 2671 } | |
| 342 | 2672 |
| 2673 return false; | |
| 2674 } | |
| 2675 | |
|
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|
2676 PrintReachableRegionClosure(outputStream* out, |
|
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2677 VerifyOption vo, |
| 1388 | 2678 bool all) : |
|
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2679 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
| 342 | 2680 }; |
| 2681 | |
| 1388 | 2682 void ConcurrentMark::print_reachable(const char* str, |
|
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2683 VerifyOption vo, |
| 1388 | 2684 bool all) { |
| 2685 gclog_or_tty->cr(); | |
| 2686 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2687 |
| 2688 if (G1PrintReachableBaseFile == NULL) { | |
| 2689 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2690 return; | |
| 2691 } | |
| 2692 | |
| 2693 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2694 (JVM_MAXPATHLEN - 1)) { | |
| 2695 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2696 return; | |
| 2697 } | |
| 2698 | |
| 2699 char file_name[JVM_MAXPATHLEN]; | |
| 2700 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2701 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2702 | |
| 2703 fileStream fout(file_name); | |
| 2704 if (!fout.is_open()) { | |
| 2705 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2706 return; | |
| 2707 } | |
| 2708 | |
| 2709 outputStream* out = &fout; | |
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2710 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
| 1044 | 2711 out->cr(); |
| 2712 | |
| 1388 | 2713 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2714 out->cr(); |
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2715 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2716 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2717 out->cr(); |
| 2718 | |
| 2719 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2720 gclog_or_tty->flush(); |
| 342 | 2721 } |
| 2722 | |
| 1044 | 2723 #endif // PRODUCT |
| 2724 | |
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2725 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2726 // Note we are overriding the read-only view of the prev map here, via |
| 2727 // the cast. | |
| 2728 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2729 } |
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2730 |
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2731 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2732 _nextMarkBitMap->clearRange(mr); |
| 2733 } | |
| 2734 | |
|
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2735 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
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2736 clearRangePrevBitmap(mr); |
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2737 clearRangeNextBitmap(mr); |
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2738 } |
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2739 |
| 342 | 2740 HeapRegion* |
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2741 ConcurrentMark::claim_region(uint worker_id) { |
| 342 | 2742 // "checkpoint" the finger |
| 2743 HeapWord* finger = _finger; | |
| 2744 | |
| 2745 // _heap_end will not change underneath our feet; it only changes at | |
| 2746 // yield points. | |
| 2747 while (finger < _heap_end) { | |
|
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2748 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2749 |
| 3771 | 2750 // Note on how this code handles humongous regions. In the |
| 2751 // normal case the finger will reach the start of a "starts | |
| 2752 // humongous" (SH) region. Its end will either be the end of the | |
| 2753 // last "continues humongous" (CH) region in the sequence, or the | |
| 2754 // standard end of the SH region (if the SH is the only region in | |
| 2755 // the sequence). That way claim_region() will skip over the CH | |
| 2756 // regions. However, there is a subtle race between a CM thread | |
| 2757 // executing this method and a mutator thread doing a humongous | |
| 2758 // object allocation. The two are not mutually exclusive as the CM | |
| 2759 // thread does not need to hold the Heap_lock when it gets | |
| 2760 // here. So there is a chance that claim_region() will come across | |
| 2761 // a free region that's in the progress of becoming a SH or a CH | |
| 2762 // region. In the former case, it will either | |
| 2763 // a) Miss the update to the region's end, in which case it will | |
| 2764 // visit every subsequent CH region, will find their bitmaps | |
| 2765 // empty, and do nothing, or | |
| 2766 // b) Will observe the update of the region's end (in which case | |
| 2767 // it will skip the subsequent CH regions). | |
| 2768 // If it comes across a region that suddenly becomes CH, the | |
| 2769 // scenario will be similar to b). So, the race between | |
| 2770 // claim_region() and a humongous object allocation might force us | |
| 2771 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2772 // iterations) but it should not introduce and correctness issues. | |
| 2773 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2774 HeapWord* bottom = curr_region->bottom(); |
| 2775 HeapWord* end = curr_region->end(); | |
| 2776 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2777 | |
| 3771 | 2778 if (verbose_low()) { |
|
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2779 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
| 342 | 2780 "["PTR_FORMAT", "PTR_FORMAT"), " |
| 2781 "limit = "PTR_FORMAT, | |
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2782 worker_id, curr_region, bottom, end, limit); |
| 3771 | 2783 } |
| 2784 | |
| 2785 // Is the gap between reading the finger and doing the CAS too long? | |
| 2786 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2787 if (res == finger) { |
| 2788 // we succeeded | |
| 2789 | |
| 2790 // notice that _finger == end cannot be guaranteed here since, | |
| 2791 // someone else might have moved the finger even further | |
|
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2792 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2793 |
|
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2794 if (verbose_low()) { |
|
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2795 gclog_or_tty->print_cr("[%u] we were successful with region = " |
|
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2796 PTR_FORMAT, worker_id, curr_region); |
|
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2797 } |
| 342 | 2798 |
| 2799 if (limit > bottom) { | |
|
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2800 if (verbose_low()) { |
|
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2801 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
|
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2802 "returning it ", worker_id, curr_region); |
|
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2803 } |
| 342 | 2804 return curr_region; |
| 2805 } else { | |
|
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2806 assert(limit == bottom, |
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2807 "the region limit should be at bottom"); |
|
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2808 if (verbose_low()) { |
|
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2809 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2810 "returning NULL", worker_id, curr_region); |
|
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2811 } |
| 342 | 2812 // we return NULL and the caller should try calling |
| 2813 // claim_region() again. | |
| 2814 return NULL; | |
| 2815 } | |
| 2816 } else { | |
|
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2817 assert(_finger > finger, "the finger should have moved forward"); |
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2818 if (verbose_low()) { |
|
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2819 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
| 342 | 2820 "global finger = "PTR_FORMAT", " |
| 2821 "our finger = "PTR_FORMAT, | |
|
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2822 worker_id, _finger, finger); |
|
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2823 } |
| 342 | 2824 |
| 2825 // read it again | |
| 2826 finger = _finger; | |
| 2827 } | |
| 2828 } | |
| 2829 | |
| 2830 return NULL; | |
| 2831 } | |
| 2832 | |
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2833 #ifndef PRODUCT |
|
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2834 enum VerifyNoCSetOopsPhase { |
|
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2835 VerifyNoCSetOopsStack, |
|
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2836 VerifyNoCSetOopsQueues, |
|
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2837 VerifyNoCSetOopsSATBCompleted, |
|
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2838 VerifyNoCSetOopsSATBThread |
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|
2839 }; |
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2840 |
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2841 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2842 private: |
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2843 G1CollectedHeap* _g1h; |
|
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2844 VerifyNoCSetOopsPhase _phase; |
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2845 int _info; |
|
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2846 |
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2847 const char* phase_str() { |
|
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2848 switch (_phase) { |
|
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2849 case VerifyNoCSetOopsStack: return "Stack"; |
|
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2850 case VerifyNoCSetOopsQueues: return "Queue"; |
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2851 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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2852 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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2853 default: ShouldNotReachHere(); |
|
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2854 } |
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2855 return NULL; |
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|
2856 } |
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2857 |
|
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|
2858 void do_object_work(oop obj) { |
|
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2859 guarantee(!_g1h->obj_in_cs(obj), |
|
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2860 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
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2861 (void*) obj, phase_str(), _info)); |
|
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|
2862 } |
|
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2863 |
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2864 public: |
|
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|
2865 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2866 |
|
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2867 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
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2868 _phase = phase; |
|
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2869 _info = info; |
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|
2870 } |
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2871 |
|
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2872 virtual void do_oop(oop* p) { |
|
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2873 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2874 do_object_work(obj); |
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2875 } |
|
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2876 |
|
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2877 virtual void do_oop(narrowOop* p) { |
|
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2878 // We should not come across narrow oops while scanning marking |
|
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2879 // stacks and SATB buffers. |
|
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|
2880 ShouldNotReachHere(); |
|
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|
2881 } |
|
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2882 |
|
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|
2883 virtual void do_object(oop obj) { |
|
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|
2884 do_object_work(obj); |
|
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2885 } |
|
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|
2886 }; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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|
2887 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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|
2888 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
2ace1c4ee8da
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parents:
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|
2889 bool verify_enqueued_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
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|
2890 bool verify_thread_buffers, |
|
2ace1c4ee8da
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tonyp
parents:
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|
2891 bool verify_fingers) { |
|
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tonyp
parents:
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|
2892 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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|
2893 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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|
2894 return; |
| 342 | 2895 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
2896 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2897 VerifyNoCSetOopsClosure cl; |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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|
2898 |
|
2ace1c4ee8da
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parents:
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diff
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|
2899 if (verify_stacks) { |
|
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|
2900 // Verify entries on the global mark stack |
|
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|
2901 cl.set_phase(VerifyNoCSetOopsStack); |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2902 _markStack.oops_do(&cl); |
|
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|
2903 |
|
2ace1c4ee8da
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|
2904 // Verify entries on the task queues |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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|
2905 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
4787
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|
2906 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
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|
2907 CMTaskQueue* queue = _task_queues->queue(i); |
|
4787
2ace1c4ee8da
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|
2908 queue->oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2909 } |
|
2ace1c4ee8da
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parents:
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|
2910 } |
|
2ace1c4ee8da
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parents:
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|
2911 |
|
2ace1c4ee8da
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parents:
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|
2912 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
2ace1c4ee8da
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|
2913 |
|
2ace1c4ee8da
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changeset
|
2914 // Verify entries on the enqueued SATB buffers |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2915 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
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|
2916 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
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|
2917 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
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|
2918 } |
|
2ace1c4ee8da
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|
2919 |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
2920 // Verify entries on the per-thread SATB buffers |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
2921 if (verify_thread_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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changeset
|
2922 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
2ace1c4ee8da
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tonyp
parents:
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changeset
|
2923 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
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johnc
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1833
diff
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|
2924 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
2925 |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2926 if (verify_fingers) { |
|
2ace1c4ee8da
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parents:
4783
diff
changeset
|
2927 // Verify the global finger |
|
2ace1c4ee8da
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parents:
4783
diff
changeset
|
2928 HeapWord* global_finger = finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2929 if (global_finger != NULL && global_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2930 // The global finger always points to a heap region boundary. We |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
2931 // 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
|
2932 // given that the global finger could be pointing to a free region |
|
2ace1c4ee8da
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4783
diff
changeset
|
2933 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2934 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2935 // 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
|
2936 // not hold any more. |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
2937 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
|
2938 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2939 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2940 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2941 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2942 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2943 // Verify the task fingers |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2944 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
|
2945 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
|
2946 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2947 HeapWord* task_finger = task->finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2948 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
|
2949 // 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
|
2950 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
|
2951 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2952 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2953 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2954 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2955 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2956 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2957 } |
| 342 | 2958 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2959 #endif // PRODUCT |
| 342 | 2960 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2961 // Aggregate the counting data that was constructed concurrently |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2962 // with marking. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2963 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2964 G1CollectedHeap* _g1h; |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2965 ConcurrentMark* _cm; |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2966 CardTableModRefBS* _ct_bs; |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2967 BitMap* _cm_card_bm; |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2968 uint _max_worker_id; |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2969 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2970 public: |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2971 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2972 BitMap* cm_card_bm, |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2973 uint max_worker_id) : |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2974 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2975 _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
|
2976 _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
|
2977 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2978 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2979 if (hr->continuesHumongous()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2980 // 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
|
2981 // associated "starts humongous" region is processed. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 // Note that we cannot rely on their associated |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 // "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
|
2984 // 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
|
2985 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2986 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2987 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2989 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2992 HeapWord* end = hr->end(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2993 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2994 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
|
2995 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2996 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2997 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2998 start, limit, hr->top(), hr->end())); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2999 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3000 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3001 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3002 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3003 // 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
|
3004 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3005 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3006 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3007 // 'start' should be in the heap. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3008 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3009 // '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
|
3010 assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3011 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3012 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3013 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3014 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3015 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3016 // 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
|
3017 // 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
|
3018 // the object ending at ntams. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3019 // 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
|
3020 // could be actually just beyond the end of the the heap; |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3021 // limit_idx will then correspond to a (non-existent) card |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3022 // that is also outside the heap. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3023 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3024 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3025 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3026 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3027 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3028 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3029 // 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
|
3030 uint hrs_index = hr->hrs_index(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3031 size_t marked_bytes = 0; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3032 |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3033 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3034 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3035 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3036 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3037 // Fetch the marked_bytes in this region for task i and |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3038 // add it to the running total for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3039 marked_bytes += marked_bytes_array[hrs_index]; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3040 |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3041 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3042 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3043 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3044 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3045 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3046 assert(task_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3047 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3049 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3050 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3051 // 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
|
3052 // parameter. It does, however, have an early exit if |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 // left_offset == right_offset. So let's limit the value |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3054 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3055 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3056 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3057 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3058 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3059 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3060 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3061 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3062 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3063 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3064 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3065 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3066 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3067 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3068 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3069 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3070 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3071 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3072 BitMap* _cm_card_bm; |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3073 uint _max_worker_id; |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3074 int _active_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3075 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3076 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3077 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3078 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3079 BitMap* cm_card_bm, |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3080 uint max_worker_id, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3081 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3082 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3083 _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
|
3084 _max_worker_id(max_worker_id), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3085 _active_workers(n_workers) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3086 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3087 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
|
3088 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
|
3089 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3090 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3091 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3092 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3093 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3094 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3095 _g1h->heap_region_iterate(&cl); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3096 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3097 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3098 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3099 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3100 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3101 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3102 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3103 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3104 1); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3105 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3106 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
|
3107 _max_worker_id, n_workers); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3108 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3109 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3110 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3111 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3112 _g1h->set_par_threads(n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3113 _g1h->workers()->run_task(&g1_par_agg_task); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3114 _g1h->set_par_threads(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3115 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3116 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3117 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3118 _g1h->reset_heap_region_claim_values(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3119 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3120 g1_par_agg_task.work(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3121 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3122 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3123 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3124 // 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
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|
3125 void ConcurrentMark::clear_all_count_data() { |
|
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|
3126 // Clear the global card bitmap - it will be filled during |
|
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|
3127 // liveness count aggregation (during remark) and the |
|
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|
3128 // final counting task. |
|
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|
3129 _card_bm.clear(); |
|
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|
3130 |
|
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|
3131 // Clear the global region bitmap - it will be filled as part |
|
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|
3132 // of the final counting task. |
|
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|
3133 _region_bm.clear(); |
|
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|
3134 |
|
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|
3135 uint max_regions = _g1h->max_regions(); |
|
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|
3136 assert(_max_worker_id > 0, "uninitialized"); |
|
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|
3137 |
|
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|
3138 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
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|
3139 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
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|
3140 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
|
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|
3141 |
|
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|
3142 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
|
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|
3143 assert(marked_bytes_array != NULL, "uninitialized"); |
|
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|
3144 |
|
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3145 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
|
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|
3146 task_card_bm->clear(); |
|
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|
3147 } |
|
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|
3148 } |
|
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|
3149 |
| 342 | 3150 void ConcurrentMark::print_stats() { |
| 3151 if (verbose_stats()) { | |
| 3152 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3153 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3154 _tasks[i]->print_stats(); | |
| 3155 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3156 } | |
| 3157 } | |
| 3158 } | |
| 3159 | |
| 3160 // abandon current marking iteration due to a Full GC | |
| 3161 void ConcurrentMark::abort() { | |
| 3162 // Clear all marks to force marking thread to do nothing | |
| 3163 _nextMarkBitMap->clearAll(); | |
|
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|
3164 // Clear the liveness counting data |
|
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|
3165 clear_all_count_data(); |
| 342 | 3166 // Empty mark stack |
|
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|
3167 reset_marking_state(); |
|
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3168 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 3169 _tasks[i]->clear_region_fields(); |
|
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|
3170 } |
| 342 | 3171 _has_aborted = true; |
| 3172 | |
| 3173 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3174 satb_mq_set.abandon_partial_marking(); | |
|
1317
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|
3175 // This can be called either during or outside marking, we'll read |
|
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|
3176 // the expected_active value from the SATB queue set. |
|
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|
3177 satb_mq_set.set_active_all_threads( |
|
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|
3178 false, /* new active value */ |
|
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|
3179 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3180 } |
| 3181 | |
| 3182 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3183 NumberSeq& ns) { | |
| 3184 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3185 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3186 if (ns.num() > 0) { | |
| 3187 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3188 prefix, ns.sd(), ns.maximum()); | |
| 3189 } | |
| 3190 } | |
| 3191 | |
| 3192 void ConcurrentMark::print_summary_info() { | |
| 3193 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3194 print_ms_time_info(" ", "init marks", _init_times); | |
| 3195 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3196 { | |
| 3197 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3198 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3199 | |
| 3200 } | |
| 3201 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3202 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3203 _total_counting_time, | |
| 3204 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3205 (double)_cleanup_times.num() | |
| 3206 : 0.0)); | |
| 3207 if (G1ScrubRemSets) { | |
| 3208 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3209 _total_rs_scrub_time, | |
| 3210 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3211 (double)_cleanup_times.num() | |
| 3212 : 0.0)); | |
| 3213 } | |
| 3214 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3215 (_init_times.sum() + _remark_times.sum() + | |
| 3216 _cleanup_times.sum())/1000.0); | |
| 3217 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
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|
3218 "(%8.2f s marking).", |
| 342 | 3219 cmThread()->vtime_accum(), |
|
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|
3220 cmThread()->vtime_mark_accum()); |
| 342 | 3221 } |
| 3222 | |
| 1019 | 3223 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
|
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|
3224 if (use_parallel_marking_threads()) { |
|
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|
3225 _parallel_workers->print_worker_threads_on(st); |
|
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|
3226 } |
| 1019 | 3227 } |
| 3228 | |
| 342 | 3229 // We take a break if someone is trying to stop the world. |
|
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|
3230 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3231 if (should_yield()) { |
|
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|
3232 if (worker_id == 0) { |
| 342 | 3233 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3234 } |
| 342 | 3235 cmThread()->yield(); |
| 3236 return true; | |
| 3237 } else { | |
| 3238 return false; | |
| 3239 } | |
| 3240 } | |
| 3241 | |
| 3242 bool ConcurrentMark::should_yield() { | |
| 3243 return cmThread()->should_yield(); | |
| 3244 } | |
| 3245 | |
| 3246 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3247 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3248 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3249 } | |
| 3250 | |
| 3251 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3252 void* last) { | |
|
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|
3253 return containing_card_is_marked(start) && |
|
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|
3254 containing_card_is_marked(last); |
| 342 | 3255 } |
| 3256 | |
| 3257 #ifndef PRODUCT | |
| 3258 // for debugging purposes | |
| 3259 void ConcurrentMark::print_finger() { | |
| 3260 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3261 _heap_start, _heap_end, _finger); | |
|
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|
3262 for (uint i = 0; i < _max_worker_id; ++i) { |
|
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|
3263 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
| 342 | 3264 } |
| 3265 gclog_or_tty->print_cr(""); | |
| 3266 } | |
| 3267 #endif | |
| 3268 | |
| 3771 | 3269 void CMTask::scan_object(oop obj) { |
| 3270 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3271 | |
| 3272 if (_cm->verbose_high()) { | |
|
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|
3273 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
|
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|
3274 _worker_id, (void*) obj); |
| 3771 | 3275 } |
| 3276 | |
| 3277 size_t obj_size = obj->size(); | |
| 3278 _words_scanned += obj_size; | |
| 3279 | |
| 3280 obj->oop_iterate(_cm_oop_closure); | |
| 3281 statsOnly( ++_objs_scanned ); | |
| 3282 check_limits(); | |
| 3283 } | |
| 3284 | |
| 342 | 3285 // Closure for iteration over bitmaps |
| 3286 class CMBitMapClosure : public BitMapClosure { | |
| 3287 private: | |
| 3288 // the bitmap that is being iterated over | |
| 3289 CMBitMap* _nextMarkBitMap; | |
| 3290 ConcurrentMark* _cm; | |
| 3291 CMTask* _task; | |
| 3292 | |
| 3293 public: | |
|
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|
3294 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
|
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|
3295 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
| 342 | 3296 |
| 3297 bool do_bit(size_t offset) { | |
| 3298 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3299 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
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|
3300 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3301 |
|
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|
3302 statsOnly( _task->increase_objs_found_on_bitmap() ); |
|
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|
3303 assert(addr >= _task->finger(), "invariant"); |
|
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|
3304 |
|
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|
3305 // We move that task's local finger along. |
|
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|
3306 _task->move_finger_to(addr); |
| 342 | 3307 |
| 3308 _task->scan_object(oop(addr)); | |
| 3309 // we only partially drain the local queue and global stack | |
| 3310 _task->drain_local_queue(true); | |
| 3311 _task->drain_global_stack(true); | |
| 3312 | |
| 3313 // if the has_aborted flag has been raised, we need to bail out of | |
| 3314 // the iteration | |
| 3315 return !_task->has_aborted(); | |
| 3316 } | |
| 3317 }; | |
| 3318 | |
| 3319 // Closure for iterating over objects, currently only used for | |
| 3320 // processing SATB buffers. | |
| 3321 class CMObjectClosure : public ObjectClosure { | |
| 3322 private: | |
| 3323 CMTask* _task; | |
| 3324 | |
| 3325 public: | |
| 3326 void do_object(oop obj) { | |
| 3327 _task->deal_with_reference(obj); | |
| 3328 } | |
| 3329 | |
| 3330 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3331 }; | |
| 3332 | |
| 3771 | 3333 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3334 ConcurrentMark* cm, | |
| 3335 CMTask* task) | |
| 3336 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3337 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3338 | |
| 3339 if (G1UseConcMarkReferenceProcessing) { | |
|
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|
3340 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3341 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3342 } |
| 3771 | 3343 } |
| 342 | 3344 |
| 3345 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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|
3346 // Separated the asserts so that we know which one fires. |
|
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|
3347 assert(hr != NULL, |
|
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|
3348 "claim_region() should have filtered out continues humongous regions"); |
|
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|
3349 assert(!hr->continuesHumongous(), |
|
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|
3350 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3351 |
|
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|
3352 if (_cm->verbose_low()) { |
|
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|
3353 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
|
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|
3354 _worker_id, hr); |
|
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|
3355 } |
| 342 | 3356 |
| 3357 _curr_region = hr; | |
| 3358 _finger = hr->bottom(); | |
| 3359 update_region_limit(); | |
| 3360 } | |
| 3361 | |
| 3362 void CMTask::update_region_limit() { | |
| 3363 HeapRegion* hr = _curr_region; | |
| 3364 HeapWord* bottom = hr->bottom(); | |
| 3365 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3366 | |
| 3367 if (limit == bottom) { | |
|
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|
3368 if (_cm->verbose_low()) { |
|
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|
3369 gclog_or_tty->print_cr("[%u] found an empty region " |
| 342 | 3370 "["PTR_FORMAT", "PTR_FORMAT")", |
|
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|
3371 _worker_id, bottom, limit); |
|
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|
3372 } |
| 342 | 3373 // The region was collected underneath our feet. |
| 3374 // We set the finger to bottom to ensure that the bitmap | |
| 3375 // iteration that will follow this will not do anything. | |
| 3376 // (this is not a condition that holds when we set the region up, | |
| 3377 // as the region is not supposed to be empty in the first place) | |
| 3378 _finger = bottom; | |
| 3379 } else if (limit >= _region_limit) { | |
|
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|
3380 assert(limit >= _finger, "peace of mind"); |
| 342 | 3381 } else { |
|
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|
3382 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3383 // This can happen under some pretty unusual circumstances. An |
| 3384 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3385 // at bottom). We then do some allocation in the region (NTAMS | |
| 3386 // stays at bottom), followed by the region being used as a GC | |
| 3387 // alloc region (NTAMS will move to top() and the objects | |
| 3388 // originally below it will be grayed). All objects now marked in | |
| 3389 // the region are explicitly grayed, if below the global finger, | |
| 3390 // and we do not need in fact to scan anything else. So, we simply | |
| 3391 // set _finger to be limit to ensure that the bitmap iteration | |
| 3392 // doesn't do anything. | |
| 3393 _finger = limit; | |
| 3394 } | |
| 3395 | |
| 3396 _region_limit = limit; | |
| 3397 } | |
| 3398 | |
| 3399 void CMTask::giveup_current_region() { | |
|
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3400 assert(_curr_region != NULL, "invariant"); |
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3401 if (_cm->verbose_low()) { |
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3402 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3403 _worker_id, _curr_region); |
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3404 } |
| 342 | 3405 clear_region_fields(); |
| 3406 } | |
| 3407 | |
| 3408 void CMTask::clear_region_fields() { | |
| 3409 // Values for these three fields that indicate that we're not | |
| 3410 // holding on to a region. | |
| 3411 _curr_region = NULL; | |
| 3412 _finger = NULL; | |
| 3413 _region_limit = NULL; | |
| 3414 } | |
| 3415 | |
| 3771 | 3416 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3417 if (cm_oop_closure == NULL) { | |
| 3418 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3419 } else { | |
| 3420 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3421 } | |
| 3422 _cm_oop_closure = cm_oop_closure; | |
| 3423 } | |
| 3424 | |
| 342 | 3425 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
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3426 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3427 |
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3428 if (_cm->verbose_low()) { |
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3429 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3430 } |
| 342 | 3431 |
| 3432 _nextMarkBitMap = nextMarkBitMap; | |
| 3433 clear_region_fields(); | |
| 3434 | |
| 3435 _calls = 0; | |
| 3436 _elapsed_time_ms = 0.0; | |
| 3437 _termination_time_ms = 0.0; | |
| 3438 _termination_start_time_ms = 0.0; | |
| 3439 | |
| 3440 #if _MARKING_STATS_ | |
| 3441 _local_pushes = 0; | |
| 3442 _local_pops = 0; | |
| 3443 _local_max_size = 0; | |
| 3444 _objs_scanned = 0; | |
| 3445 _global_pushes = 0; | |
| 3446 _global_pops = 0; | |
| 3447 _global_max_size = 0; | |
| 3448 _global_transfers_to = 0; | |
| 3449 _global_transfers_from = 0; | |
| 3450 _regions_claimed = 0; | |
| 3451 _objs_found_on_bitmap = 0; | |
| 3452 _satb_buffers_processed = 0; | |
| 3453 _steal_attempts = 0; | |
| 3454 _steals = 0; | |
| 3455 _aborted = 0; | |
| 3456 _aborted_overflow = 0; | |
| 3457 _aborted_cm_aborted = 0; | |
| 3458 _aborted_yield = 0; | |
| 3459 _aborted_timed_out = 0; | |
| 3460 _aborted_satb = 0; | |
| 3461 _aborted_termination = 0; | |
| 3462 #endif // _MARKING_STATS_ | |
| 3463 } | |
| 3464 | |
| 3465 bool CMTask::should_exit_termination() { | |
| 3466 regular_clock_call(); | |
| 3467 // This is called when we are in the termination protocol. We should | |
| 3468 // quit if, for some reason, this task wants to abort or the global | |
| 3469 // stack is not empty (this means that we can get work from it). | |
| 3470 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3471 } | |
| 3472 | |
| 3473 void CMTask::reached_limit() { | |
|
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3474 assert(_words_scanned >= _words_scanned_limit || |
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3475 _refs_reached >= _refs_reached_limit , |
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3476 "shouldn't have been called otherwise"); |
| 342 | 3477 regular_clock_call(); |
| 3478 } | |
| 3479 | |
| 3480 void CMTask::regular_clock_call() { | |
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3481 if (has_aborted()) return; |
| 342 | 3482 |
| 3483 // First, we need to recalculate the words scanned and refs reached | |
| 3484 // limits for the next clock call. | |
| 3485 recalculate_limits(); | |
| 3486 | |
| 3487 // During the regular clock call we do the following | |
| 3488 | |
| 3489 // (1) If an overflow has been flagged, then we abort. | |
| 3490 if (_cm->has_overflown()) { | |
| 3491 set_has_aborted(); | |
| 3492 return; | |
| 3493 } | |
| 3494 | |
| 3495 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3496 // to check anything else. The other steps are only needed during | |
| 3497 // the concurrent marking phase. | |
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3498 if (!concurrent()) return; |
| 342 | 3499 |
| 3500 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3501 if (_cm->has_aborted()) { | |
| 3502 set_has_aborted(); | |
| 3503 statsOnly( ++_aborted_cm_aborted ); | |
| 3504 return; | |
| 3505 } | |
| 3506 | |
| 3507 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3508 | |
| 3509 // (3) If marking stats are enabled, then we update the step history. | |
| 3510 #if _MARKING_STATS_ | |
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3511 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3512 ++_clock_due_to_scanning; |
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3513 } |
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3514 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3515 ++_clock_due_to_marking; |
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3516 } |
| 342 | 3517 |
| 3518 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3519 _interval_start_time_ms = curr_time_ms; | |
| 3520 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3521 | |
| 3522 if (_cm->verbose_medium()) { | |
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3523 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
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3524 "scanned = %d%s, refs reached = %d%s", |
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3525 _worker_id, last_interval_ms, |
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3526 _words_scanned, |
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3527 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3528 _refs_reached, |
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3529 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3530 } |
| 3531 #endif // _MARKING_STATS_ | |
| 3532 | |
| 3533 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3534 if (_cm->should_yield()) { | |
| 3535 // We should yield. To do this we abort the task. The caller is | |
| 3536 // responsible for yielding. | |
| 3537 set_has_aborted(); | |
| 3538 statsOnly( ++_aborted_yield ); | |
| 3539 return; | |
| 3540 } | |
| 3541 | |
| 3542 // (5) We check whether we've reached our time quota. If we have, | |
| 3543 // then we abort. | |
| 3544 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3545 if (elapsed_time_ms > _time_target_ms) { | |
| 3546 set_has_aborted(); | |
|
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3547 _has_timed_out = true; |
| 342 | 3548 statsOnly( ++_aborted_timed_out ); |
| 3549 return; | |
| 3550 } | |
| 3551 | |
| 3552 // (6) Finally, we check whether there are enough completed STAB | |
| 3553 // buffers available for processing. If there are, we abort. | |
| 3554 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3555 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
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3556 if (_cm->verbose_low()) { |
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3557 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3558 _worker_id); |
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3559 } |
| 342 | 3560 // we do need to process SATB buffers, we'll abort and restart |
| 3561 // the marking task to do so | |
| 3562 set_has_aborted(); | |
| 3563 statsOnly( ++_aborted_satb ); | |
| 3564 return; | |
| 3565 } | |
| 3566 } | |
| 3567 | |
| 3568 void CMTask::recalculate_limits() { | |
| 3569 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3570 _words_scanned_limit = _real_words_scanned_limit; | |
| 3571 | |
| 3572 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3573 _refs_reached_limit = _real_refs_reached_limit; | |
| 3574 } | |
| 3575 | |
| 3576 void CMTask::decrease_limits() { | |
| 3577 // This is called when we believe that we're going to do an infrequent | |
| 3578 // operation which will increase the per byte scanned cost (i.e. move | |
| 3579 // entries to/from the global stack). It basically tries to decrease the | |
| 3580 // scanning limit so that the clock is called earlier. | |
| 3581 | |
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3582 if (_cm->verbose_medium()) { |
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3583 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3584 } |
| 342 | 3585 |
| 3586 _words_scanned_limit = _real_words_scanned_limit - | |
| 3587 3 * words_scanned_period / 4; | |
| 3588 _refs_reached_limit = _real_refs_reached_limit - | |
| 3589 3 * refs_reached_period / 4; | |
| 3590 } | |
| 3591 | |
| 3592 void CMTask::move_entries_to_global_stack() { | |
| 3593 // local array where we'll store the entries that will be popped | |
| 3594 // from the local queue | |
| 3595 oop buffer[global_stack_transfer_size]; | |
| 3596 | |
| 3597 int n = 0; | |
| 3598 oop obj; | |
| 3599 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3600 buffer[n] = obj; | |
| 3601 ++n; | |
| 3602 } | |
| 3603 | |
| 3604 if (n > 0) { | |
| 3605 // we popped at least one entry from the local queue | |
| 3606 | |
| 3607 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3608 | |
| 3609 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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3610 if (_cm->verbose_low()) { |
|
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3611 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3612 _worker_id); |
|
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3613 } |
| 342 | 3614 set_has_aborted(); |
| 3615 } else { | |
| 3616 // the transfer was successful | |
| 3617 | |
|
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3618 if (_cm->verbose_medium()) { |
|
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3619 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3620 _worker_id, n); |
|
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3621 } |
| 342 | 3622 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3623 if (tmp_size > _global_max_size) { |
| 342 | 3624 _global_max_size = tmp_size; |
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3625 } |
| 342 | 3626 _global_pushes += n ); |
| 3627 } | |
| 3628 } | |
| 3629 | |
| 3630 // this operation was quite expensive, so decrease the limits | |
| 3631 decrease_limits(); | |
| 3632 } | |
| 3633 | |
| 3634 void CMTask::get_entries_from_global_stack() { | |
| 3635 // local array where we'll store the entries that will be popped | |
| 3636 // from the global stack. | |
| 3637 oop buffer[global_stack_transfer_size]; | |
| 3638 int n; | |
| 3639 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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3640 assert(n <= global_stack_transfer_size, |
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3641 "we should not pop more than the given limit"); |
| 342 | 3642 if (n > 0) { |
| 3643 // yes, we did actually pop at least one entry | |
| 3644 | |
| 3645 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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3646 if (_cm->verbose_medium()) { |
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3647 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3648 _worker_id, n); |
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3649 } |
| 342 | 3650 for (int i = 0; i < n; ++i) { |
| 3651 bool success = _task_queue->push(buffer[i]); | |
| 3652 // We only call this when the local queue is empty or under a | |
| 3653 // given target limit. So, we do not expect this push to fail. | |
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3654 assert(success, "invariant"); |
| 342 | 3655 } |
| 3656 | |
| 3657 statsOnly( int tmp_size = _task_queue->size(); | |
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3658 if (tmp_size > _local_max_size) { |
| 342 | 3659 _local_max_size = tmp_size; |
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3660 } |
| 342 | 3661 _local_pushes += n ); |
| 3662 } | |
| 3663 | |
| 3664 // this operation was quite expensive, so decrease the limits | |
| 3665 decrease_limits(); | |
| 3666 } | |
| 3667 | |
| 3668 void CMTask::drain_local_queue(bool partially) { | |
|
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3669 if (has_aborted()) return; |
| 342 | 3670 |
| 3671 // Decide what the target size is, depending whether we're going to | |
| 3672 // drain it partially (so that other tasks can steal if they run out | |
| 3673 // of things to do) or totally (at the very end). | |
| 3674 size_t target_size; | |
|
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3675 if (partially) { |
| 342 | 3676 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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3677 } else { |
| 342 | 3678 target_size = 0; |
|
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3679 } |
| 342 | 3680 |
| 3681 if (_task_queue->size() > target_size) { | |
|
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3682 if (_cm->verbose_high()) { |
|
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3683 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
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3684 _worker_id, target_size); |
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3685 } |
| 342 | 3686 |
| 3687 oop obj; | |
| 3688 bool ret = _task_queue->pop_local(obj); | |
| 3689 while (ret) { | |
| 3690 statsOnly( ++_local_pops ); | |
| 3691 | |
|
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|
3692 if (_cm->verbose_high()) { |
|
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3693 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
| 342 | 3694 (void*) obj); |
|
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3695 } |
| 342 | 3696 |
|
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|
3697 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3698 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3699 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3700 |
| 3701 scan_object(obj); | |
| 3702 | |
|
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|
3703 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3704 ret = false; |
|
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|
3705 } else { |
| 342 | 3706 ret = _task_queue->pop_local(obj); |
|
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3707 } |
| 342 | 3708 } |
| 3709 | |
|
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|
3710 if (_cm->verbose_high()) { |
|
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3711 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
|
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3712 _worker_id, _task_queue->size()); |
|
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3713 } |
| 342 | 3714 } |
| 3715 } | |
| 3716 | |
| 3717 void CMTask::drain_global_stack(bool partially) { | |
|
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|
3718 if (has_aborted()) return; |
| 342 | 3719 |
| 3720 // We have a policy to drain the local queue before we attempt to | |
| 3721 // drain the global stack. | |
|
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3722 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3723 |
| 3724 // Decide what the target size is, depending whether we're going to | |
| 3725 // drain it partially (so that other tasks can steal if they run out | |
| 3726 // of things to do) or totally (at the very end). Notice that, | |
| 3727 // because we move entries from the global stack in chunks or | |
| 3728 // because another task might be doing the same, we might in fact | |
| 3729 // drop below the target. But, this is not a problem. | |
| 3730 size_t target_size; | |
|
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3731 if (partially) { |
| 342 | 3732 target_size = _cm->partial_mark_stack_size_target(); |
|
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3733 } else { |
| 342 | 3734 target_size = 0; |
|
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3735 } |
| 342 | 3736 |
| 3737 if (_cm->mark_stack_size() > target_size) { | |
|
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|
3738 if (_cm->verbose_low()) { |
|
6862
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|
3739 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
|
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3740 _worker_id, target_size); |
|
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|
3741 } |
| 342 | 3742 |
| 3743 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3744 get_entries_from_global_stack(); | |
| 3745 drain_local_queue(partially); | |
| 3746 } | |
| 3747 | |
|
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|
3748 if (_cm->verbose_low()) { |
|
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|
3749 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
|
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3750 _worker_id, _cm->mark_stack_size()); |
|
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|
3751 } |
| 342 | 3752 } |
| 3753 } | |
| 3754 | |
| 3755 // SATB Queue has several assumptions on whether to call the par or | |
| 3756 // non-par versions of the methods. this is why some of the code is | |
| 3757 // replicated. We should really get rid of the single-threaded version | |
| 3758 // of the code to simplify things. | |
| 3759 void CMTask::drain_satb_buffers() { | |
|
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|
3760 if (has_aborted()) return; |
| 342 | 3761 |
| 3762 // We set this so that the regular clock knows that we're in the | |
| 3763 // middle of draining buffers and doesn't set the abort flag when it | |
| 3764 // notices that SATB buffers are available for draining. It'd be | |
| 3765 // very counter productive if it did that. :-) | |
| 3766 _draining_satb_buffers = true; | |
| 3767 | |
| 3768 CMObjectClosure oc(this); | |
| 3769 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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|
3770 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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3771 satb_mq_set.set_par_closure(_worker_id, &oc); |
|
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3772 } else { |
| 342 | 3773 satb_mq_set.set_closure(&oc); |
|
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|
3774 } |
| 342 | 3775 |
| 3776 // This keeps claiming and applying the closure to completed buffers | |
| 3777 // until we run out of buffers or we need to abort. | |
|
1833
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|
3778 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3779 while (!has_aborted() && |
|
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|
3780 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
|
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|
3781 if (_cm->verbose_medium()) { |
|
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|
3782 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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|
3783 } |
| 342 | 3784 statsOnly( ++_satb_buffers_processed ); |
| 3785 regular_clock_call(); | |
| 3786 } | |
| 3787 } else { | |
| 3788 while (!has_aborted() && | |
| 3789 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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|
3790 if (_cm->verbose_medium()) { |
|
6862
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|
3791 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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|
3792 } |
| 342 | 3793 statsOnly( ++_satb_buffers_processed ); |
| 3794 regular_clock_call(); | |
| 3795 } | |
| 3796 } | |
| 3797 | |
| 3798 if (!concurrent() && !has_aborted()) { | |
| 3799 // We should only do this during remark. | |
|
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|
3800 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
6862
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|
3801 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
|
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|
3802 } else { |
| 342 | 3803 satb_mq_set.iterate_closure_all_threads(); |
|
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|
3804 } |
| 342 | 3805 } |
| 3806 | |
| 3807 _draining_satb_buffers = false; | |
| 3808 | |
|
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|
3809 assert(has_aborted() || |
|
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|
3810 concurrent() || |
|
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|
3811 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 3812 |
|
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|
3813 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
6862
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|
3814 satb_mq_set.set_par_closure(_worker_id, NULL); |
|
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|
3815 } else { |
| 342 | 3816 satb_mq_set.set_closure(NULL); |
|
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|
3817 } |
| 342 | 3818 |
| 3819 // again, this was a potentially expensive operation, decrease the | |
| 3820 // limits to get the regular clock call early | |
| 3821 decrease_limits(); | |
| 3822 } | |
| 3823 | |
| 3824 void CMTask::print_stats() { | |
|
6862
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|
3825 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
|
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|
3826 _worker_id, _calls); |
| 342 | 3827 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
| 3828 _elapsed_time_ms, _termination_time_ms); | |
| 3829 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3830 _step_times_ms.num(), _step_times_ms.avg(), | |
| 3831 _step_times_ms.sd()); | |
| 3832 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3833 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 3834 | |
| 3835 #if _MARKING_STATS_ | |
| 3836 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3837 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 3838 _all_clock_intervals_ms.sd()); | |
| 3839 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3840 _all_clock_intervals_ms.maximum(), | |
| 3841 _all_clock_intervals_ms.sum()); | |
| 3842 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 3843 _clock_due_to_scanning, _clock_due_to_marking); | |
| 3844 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 3845 _objs_scanned, _objs_found_on_bitmap); | |
| 3846 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 3847 _local_pushes, _local_pops, _local_max_size); | |
| 3848 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 3849 _global_pushes, _global_pops, _global_max_size); | |
| 3850 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 3851 _global_transfers_to,_global_transfers_from); | |
|
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|
3852 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
| 342 | 3853 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
| 3854 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 3855 _steal_attempts, _steals); | |
| 3856 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 3857 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 3858 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 3859 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 3860 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 3861 #endif // _MARKING_STATS_ | |
| 3862 } | |
| 3863 | |
| 3864 /***************************************************************************** | |
| 3865 | |
|
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|
3866 The do_marking_step(time_target_ms, ...) method is the building |
|
fa08949fe0cb
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|
3867 block of the parallel marking framework. It can be called in parallel |
| 342 | 3868 with other invocations of do_marking_step() on different tasks |
| 3869 (but only one per task, obviously) and concurrently with the | |
| 3870 mutator threads, or during remark, hence it eliminates the need | |
| 3871 for two versions of the code. When called during remark, it will | |
| 3872 pick up from where the task left off during the concurrent marking | |
| 3873 phase. Interestingly, tasks are also claimable during evacuation | |
| 3874 pauses too, since do_marking_step() ensures that it aborts before | |
| 3875 it needs to yield. | |
| 3876 | |
|
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|
3877 The data structures that it uses to do marking work are the |
| 342 | 3878 following: |
| 3879 | |
| 3880 (1) Marking Bitmap. If there are gray objects that appear only | |
| 3881 on the bitmap (this happens either when dealing with an overflow | |
| 3882 or when the initial marking phase has simply marked the roots | |
| 3883 and didn't push them on the stack), then tasks claim heap | |
| 3884 regions whose bitmap they then scan to find gray objects. A | |
| 3885 global finger indicates where the end of the last claimed region | |
| 3886 is. A local finger indicates how far into the region a task has | |
| 3887 scanned. The two fingers are used to determine how to gray an | |
| 3888 object (i.e. whether simply marking it is OK, as it will be | |
| 3889 visited by a task in the future, or whether it needs to be also | |
| 3890 pushed on a stack). | |
| 3891 | |
| 3892 (2) Local Queue. The local queue of the task which is accessed | |
| 3893 reasonably efficiently by the task. Other tasks can steal from | |
| 3894 it when they run out of work. Throughout the marking phase, a | |
| 3895 task attempts to keep its local queue short but not totally | |
| 3896 empty, so that entries are available for stealing by other | |
| 3897 tasks. Only when there is no more work, a task will totally | |
| 3898 drain its local queue. | |
| 3899 | |
| 3900 (3) Global Mark Stack. This handles local queue overflow. During | |
| 3901 marking only sets of entries are moved between it and the local | |
| 3902 queues, as access to it requires a mutex and more fine-grain | |
| 3903 interaction with it which might cause contention. If it | |
| 3904 overflows, then the marking phase should restart and iterate | |
| 3905 over the bitmap to identify gray objects. Throughout the marking | |
| 3906 phase, tasks attempt to keep the global mark stack at a small | |
| 3907 length but not totally empty, so that entries are available for | |
| 3908 popping by other tasks. Only when there is no more work, tasks | |
| 3909 will totally drain the global mark stack. | |
| 3910 | |
|
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3911 (4) SATB Buffer Queue. This is where completed SATB buffers are |
| 342 | 3912 made available. Buffers are regularly removed from this queue |
| 3913 and scanned for roots, so that the queue doesn't get too | |
| 3914 long. During remark, all completed buffers are processed, as | |
| 3915 well as the filled in parts of any uncompleted buffers. | |
| 3916 | |
| 3917 The do_marking_step() method tries to abort when the time target | |
| 3918 has been reached. There are a few other cases when the | |
| 3919 do_marking_step() method also aborts: | |
| 3920 | |
| 3921 (1) When the marking phase has been aborted (after a Full GC). | |
| 3922 | |
|
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3923 (2) When a global overflow (on the global stack) has been |
|
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|
3924 triggered. Before the task aborts, it will actually sync up with |
|
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|
3925 the other tasks to ensure that all the marking data structures |
|
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|
3926 (local queues, stacks, fingers etc.) are re-initialised so that |
|
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|
3927 when do_marking_step() completes, the marking phase can |
|
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|
3928 immediately restart. |
| 342 | 3929 |
| 3930 (3) When enough completed SATB buffers are available. The | |
| 3931 do_marking_step() method only tries to drain SATB buffers right | |
| 3932 at the beginning. So, if enough buffers are available, the | |
| 3933 marking step aborts and the SATB buffers are processed at | |
| 3934 the beginning of the next invocation. | |
| 3935 | |
| 3936 (4) To yield. when we have to yield then we abort and yield | |
| 3937 right at the end of do_marking_step(). This saves us from a lot | |
| 3938 of hassle as, by yielding we might allow a Full GC. If this | |
| 3939 happens then objects will be compacted underneath our feet, the | |
| 3940 heap might shrink, etc. We save checking for this by just | |
| 3941 aborting and doing the yield right at the end. | |
| 3942 | |
| 3943 From the above it follows that the do_marking_step() method should | |
| 3944 be called in a loop (or, otherwise, regularly) until it completes. | |
| 3945 | |
| 3946 If a marking step completes without its has_aborted() flag being | |
| 3947 true, it means it has completed the current marking phase (and | |
| 3948 also all other marking tasks have done so and have all synced up). | |
| 3949 | |
| 3950 A method called regular_clock_call() is invoked "regularly" (in | |
| 3951 sub ms intervals) throughout marking. It is this clock method that | |
| 3952 checks all the abort conditions which were mentioned above and | |
| 3953 decides when the task should abort. A work-based scheme is used to | |
| 3954 trigger this clock method: when the number of object words the | |
| 3955 marking phase has scanned or the number of references the marking | |
| 3956 phase has visited reach a given limit. Additional invocations to | |
| 3957 the method clock have been planted in a few other strategic places | |
| 3958 too. The initial reason for the clock method was to avoid calling | |
| 3959 vtime too regularly, as it is quite expensive. So, once it was in | |
| 3960 place, it was natural to piggy-back all the other conditions on it | |
| 3961 too and not constantly check them throughout the code. | |
| 3962 | |
|
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|
3963 If do_termination is true then do_marking_step will enter its |
|
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|
3964 termination protocol. |
|
fa08949fe0cb
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|
3965 |
|
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|
3966 The value of is_serial must be true when do_marking_step is being |
|
fa08949fe0cb
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|
3967 called serially (i.e. by the VMThread) and do_marking_step should |
|
fa08949fe0cb
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|
3968 skip any synchronization in the termination and overflow code. |
|
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|
3969 Examples include the serial remark code and the serial reference |
|
fa08949fe0cb
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|
3970 processing closures. |
|
fa08949fe0cb
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|
3971 |
|
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|
3972 The value of is_serial must be false when do_marking_step is |
|
fa08949fe0cb
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|
3973 being called by any of the worker threads in a work gang. |
|
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|
3974 Examples include the concurrent marking code (CMMarkingTask), |
|
fa08949fe0cb
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|
3975 the MT remark code, and the MT reference processing closures. |
|
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|
3976 |
| 342 | 3977 *****************************************************************************/ |
| 3978 | |
|
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|
3979 void CMTask::do_marking_step(double time_target_ms, |
|
8787
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|
3980 bool do_termination, |
|
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|
3981 bool is_serial) { |
|
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|
3982 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
|
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|
3983 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
|
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|
3984 |
| 342 | 3985 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
|
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|
3986 assert(_task_queues != NULL, "invariant"); |
|
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|
3987 assert(_task_queue != NULL, "invariant"); |
|
6862
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|
3988 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
|
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|
3989 |
|
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|
3990 assert(!_claimed, |
|
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|
3991 "only one thread should claim this task at any one time"); |
| 342 | 3992 |
| 3993 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 3994 // possible for two threads to set the _claimed flag at the same | |
| 3995 // time. But it is only for debugging purposes anyway and it will | |
| 3996 // catch most problems. | |
| 3997 _claimed = true; | |
| 3998 | |
| 3999 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4000 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4001 | |
|
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|
4002 // If do_stealing is true then do_marking_step will attempt to |
|
fa08949fe0cb
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|
4003 // steal work from the other CMTasks. It only makes sense to |
|
fa08949fe0cb
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|
4004 // enable stealing when the termination protocol is enabled |
|
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|
4005 // and do_marking_step() is not being called serially. |
|
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|
4006 bool do_stealing = do_termination && !is_serial; |
|
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|
4007 |
| 342 | 4008 double diff_prediction_ms = |
| 4009 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4010 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4011 | |
| 4012 // set up the variables that are used in the work-based scheme to | |
| 4013 // call the regular clock method | |
| 4014 _words_scanned = 0; | |
| 4015 _refs_reached = 0; | |
| 4016 recalculate_limits(); | |
| 4017 | |
| 4018 // clear all flags | |
| 4019 clear_has_aborted(); | |
|
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|
4020 _has_timed_out = false; |
| 342 | 4021 _draining_satb_buffers = false; |
| 4022 | |
| 4023 ++_calls; | |
| 4024 | |
|
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|
4025 if (_cm->verbose_low()) { |
|
6862
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|
4026 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
| 342 | 4027 "target = %1.2lfms >>>>>>>>>>", |
|
6862
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|
4028 _worker_id, _calls, _time_target_ms); |
|
3776
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|
4029 } |
| 342 | 4030 |
| 4031 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4032 // eventually called from this method, so it is OK to allocate these | |
| 4033 // statically. | |
| 4034 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4035 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4036 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4037 |
| 4038 if (_cm->has_overflown()) { | |
|
5988
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|
4039 // This can happen if the mark stack overflows during a GC pause |
|
2a0172480595
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|
4040 // and this task, after a yield point, restarts. We have to abort |
|
2a0172480595
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|
4041 // as we need to get into the overflow protocol which happens |
|
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|
4042 // right at the end of this task. |
| 342 | 4043 set_has_aborted(); |
| 4044 } | |
| 4045 | |
| 4046 // First drain any available SATB buffers. After this, we will not | |
| 4047 // look at SATB buffers before the next invocation of this method. | |
| 4048 // If enough completed SATB buffers are queued up, the regular clock | |
| 4049 // will abort this task so that it restarts. | |
| 4050 drain_satb_buffers(); | |
| 4051 // ...then partially drain the local queue and the global stack | |
| 4052 drain_local_queue(true); | |
| 4053 drain_global_stack(true); | |
| 4054 | |
| 4055 do { | |
| 4056 if (!has_aborted() && _curr_region != NULL) { | |
| 4057 // This means that we're already holding on to a region. | |
|
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|
4058 assert(_finger != NULL, "if region is not NULL, then the finger " |
|
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|
4059 "should not be NULL either"); |
| 342 | 4060 |
| 4061 // We might have restarted this task after an evacuation pause | |
| 4062 // which might have evacuated the region we're holding on to | |
| 4063 // underneath our feet. Let's read its limit again to make sure | |
| 4064 // that we do not iterate over a region of the heap that | |
| 4065 // contains garbage (update_region_limit() will also move | |
| 4066 // _finger to the start of the region if it is found empty). | |
| 4067 update_region_limit(); | |
| 4068 // We will start from _finger not from the start of the region, | |
| 4069 // as we might be restarting this task after aborting half-way | |
| 4070 // through scanning this region. In this case, _finger points to | |
| 4071 // the address where we last found a marked object. If this is a | |
| 4072 // fresh region, _finger points to start(). | |
| 4073 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 4074 | |
|
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|
4075 if (_cm->verbose_low()) { |
|
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|
4076 gclog_or_tty->print_cr("[%u] we're scanning part " |
| 342 | 4077 "["PTR_FORMAT", "PTR_FORMAT") " |
|
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4078 "of region "HR_FORMAT, |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4079 _worker_id, _finger, _region_limit, |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4080 HR_FORMAT_PARAMS(_curr_region)); |
|
3776
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|
4081 } |
| 342 | 4082 |
|
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4083 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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changeset
|
4084 "humongous regions should go around loop once only"); |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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8034
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|
4085 |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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8034
diff
changeset
|
4086 // Some special cases: |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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diff
changeset
|
4087 // If the memory region is empty, we can just give up the region. |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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8034
diff
changeset
|
4088 // If the current region is humongous then we only need to check |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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8034
diff
changeset
|
4089 // the bitmap for the bit associated with the start of the object, |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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8034
diff
changeset
|
4090 // scan the object if it's live, and give up the region. |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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changeset
|
4091 // Otherwise, let's iterate over the bitmap of the part of the region |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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8034
diff
changeset
|
4092 // that is left. |
|
8034
bce1ac447f6b
7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
johnc
parents:
8014
diff
changeset
|
4093 // If the iteration is successful, give up the region. |
|
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4094 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
johnc
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changeset
|
4095 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
johnc
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changeset
|
4096 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
johnc
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|
4097 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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changeset
|
4098 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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changeset
|
4099 // 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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|
4100 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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|
4101 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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|
4102 } |
|
5e401ef52ec0
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|
4103 // Even if this task aborted while scanning the humongous object |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4104 // we can (and should) give up the current region. |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4105 giveup_current_region(); |
|
5e401ef52ec0
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|
4106 regular_clock_call(); |
|
5e401ef52ec0
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|
4107 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
| 342 | 4108 giveup_current_region(); |
| 4109 regular_clock_call(); | |
| 4110 } else { | |
|
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|
4111 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4112 // The only way to abort the bitmap iteration is to return |
| 4113 // false from the do_bit() method. However, inside the | |
| 4114 // do_bit() method we move the _finger to point to the | |
| 4115 // object currently being looked at. So, if we bail out, we | |
| 4116 // have definitely set _finger to something non-null. | |
|
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|
4117 assert(_finger != NULL, "invariant"); |
| 342 | 4118 |
| 4119 // Region iteration was actually aborted. So now _finger | |
| 4120 // points to the address of the object we last scanned. If we | |
| 4121 // leave it there, when we restart this task, we will rescan | |
| 4122 // the object. It is easy to avoid this. We move the finger by | |
| 4123 // enough to point to the next possible object header (the | |
| 4124 // bitmap knows by how much we need to move it as it knows its | |
| 4125 // granularity). | |
|
1314
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apetrusenko
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|
4126 assert(_finger < _region_limit, "invariant"); |
|
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
tamao
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8039
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|
4127 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
|
1314
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apetrusenko
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diff
changeset
|
4128 // Check if bitmap iteration was aborted while scanning the last object |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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changeset
|
4129 if (new_finger >= _region_limit) { |
|
5988
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|
4130 giveup_current_region(); |
|
1314
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diff
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|
4131 } else { |
|
5988
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|
4132 move_finger_to(new_finger); |
|
1314
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|
4133 } |
| 342 | 4134 } |
| 4135 } | |
| 4136 // At this point we have either completed iterating over the | |
| 4137 // region we were holding on to, or we have aborted. | |
| 4138 | |
| 4139 // We then partially drain the local queue and the global stack. | |
| 4140 // (Do we really need this?) | |
| 4141 drain_local_queue(true); | |
| 4142 drain_global_stack(true); | |
| 4143 | |
| 4144 // Read the note on the claim_region() method on why it might | |
| 4145 // return NULL with potentially more regions available for | |
| 4146 // claiming and why we have to check out_of_regions() to determine | |
| 4147 // whether we're done or not. | |
| 4148 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4149 // We are going to try to claim a new region. We should have | |
| 4150 // given up on the previous one. | |
|
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|
4151 // Separated the asserts so that we know which one fires. |
|
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|
4152 assert(_curr_region == NULL, "invariant"); |
|
11d4857fe5e1
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|
4153 assert(_finger == NULL, "invariant"); |
|
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|
4154 assert(_region_limit == NULL, "invariant"); |
|
3776
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|
4155 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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|
4156 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4157 } |
|
6862
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|
4158 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
| 342 | 4159 if (claimed_region != NULL) { |
| 4160 // Yes, we managed to claim one | |
| 4161 statsOnly( ++_regions_claimed ); | |
| 4162 | |
|
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|
4163 if (_cm->verbose_low()) { |
|
6862
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|
4164 gclog_or_tty->print_cr("[%u] we successfully claimed " |
| 342 | 4165 "region "PTR_FORMAT, |
|
6862
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|
4166 _worker_id, claimed_region); |
|
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|
4167 } |
| 342 | 4168 |
| 4169 setup_for_region(claimed_region); | |
|
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|
4170 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4171 } |
| 4172 // It is important to call the regular clock here. It might take | |
| 4173 // a while to claim a region if, for example, we hit a large | |
| 4174 // block of empty regions. So we need to call the regular clock | |
| 4175 // method once round the loop to make sure it's called | |
| 4176 // frequently enough. | |
| 4177 regular_clock_call(); | |
| 4178 } | |
| 4179 | |
| 4180 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4181 assert(_cm->out_of_regions(), |
|
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|
4182 "at this point we should be out of regions"); |
| 342 | 4183 } |
| 4184 } while ( _curr_region != NULL && !has_aborted()); | |
| 4185 | |
| 4186 if (!has_aborted()) { | |
| 4187 // We cannot check whether the global stack is empty, since other | |
|
5988
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|
4188 // tasks might be pushing objects to it concurrently. |
|
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|
4189 assert(_cm->out_of_regions(), |
|
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|
4190 "at this point we should be out of regions"); |
| 342 | 4191 |
|
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|
4192 if (_cm->verbose_low()) { |
|
6862
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|
4193 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
|
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|
4194 } |
| 342 | 4195 |
| 4196 // Try to reduce the number of available SATB buffers so that | |
| 4197 // remark has less work to do. | |
| 4198 drain_satb_buffers(); | |
| 4199 } | |
| 4200 | |
| 4201 // Since we've done everything else, we can now totally drain the | |
| 4202 // local queue and global stack. | |
| 4203 drain_local_queue(false); | |
| 4204 drain_global_stack(false); | |
| 4205 | |
| 4206 // Attempt at work stealing from other task's queues. | |
|
2174
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|
4207 if (do_stealing && !has_aborted()) { |
| 342 | 4208 // We have not aborted. This means that we have finished all that |
| 4209 // we could. Let's try to do some stealing... | |
| 4210 | |
| 4211 // We cannot check whether the global stack is empty, since other | |
|
5988
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|
4212 // tasks might be pushing objects to it concurrently. |
|
1023
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|
4213 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
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|
4214 "only way to reach here"); |
| 342 | 4215 |
|
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|
4216 if (_cm->verbose_low()) { |
|
6862
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|
4217 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
|
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|
4218 } |
| 342 | 4219 |
| 4220 while (!has_aborted()) { | |
| 4221 oop obj; | |
| 4222 statsOnly( ++_steal_attempts ); | |
| 4223 | |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4224 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
|
3776
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|
4225 if (_cm->verbose_medium()) { |
|
6862
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johnc
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|
4226 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4227 _worker_id, (void*) obj); |
|
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|
4228 } |
| 342 | 4229 |
| 4230 statsOnly( ++_steals ); | |
| 4231 | |
|
1023
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|
4232 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
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|
4233 "any stolen object should be marked"); |
| 342 | 4234 scan_object(obj); |
| 4235 | |
| 4236 // And since we're towards the end, let's totally drain the | |
| 4237 // local queue and global stack. | |
| 4238 drain_local_queue(false); | |
| 4239 drain_global_stack(false); | |
| 4240 } else { | |
| 4241 break; | |
| 4242 } | |
| 4243 } | |
| 4244 } | |
| 4245 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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diff
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|
4246 // 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.
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|
4247 // should raise the overflow flag. |
|
cd8e33b2a8ad
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|
4248 if (do_termination && !has_aborted()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4249 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4250 _cm->set_has_overflown(); |
|
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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|
4251 regular_clock_call(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
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diff
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|
4252 } |
|
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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|
4253 } |
|
cd8e33b2a8ad
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tonyp
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|
4254 |
| 342 | 4255 // We still haven't aborted. Now, let's try to get into the |
| 4256 // termination protocol. | |
|
2174
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|
4257 if (do_termination && !has_aborted()) { |
| 342 | 4258 // We cannot check whether the global stack is empty, since other |
|
5988
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|
4259 // tasks might be concurrently pushing objects on it. |
|
1023
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|
4260 // Separated the asserts so that we know which one fires. |
|
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|
4261 assert(_cm->out_of_regions(), "only way to reach here"); |
|
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|
4262 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4263 |
|
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|
4264 if (_cm->verbose_low()) { |
|
6862
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|
4265 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
|
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|
4266 } |
| 342 | 4267 |
| 4268 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
|
8787
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|
4269 |
| 342 | 4270 // The CMTask class also extends the TerminatorTerminator class, |
| 4271 // hence its should_exit_termination() method will also decide | |
| 4272 // whether to exit the termination protocol or not. | |
|
8787
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|
4273 bool finished = (is_serial || |
|
fa08949fe0cb
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changeset
|
4274 _cm->terminator()->offer_termination(this)); |
| 342 | 4275 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
| 4276 _termination_time_ms += | |
| 4277 termination_end_time_ms - _termination_start_time_ms; | |
| 4278 | |
| 4279 if (finished) { | |
| 4280 // We're all done. | |
| 4281 | |
|
6862
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|
4282 if (_worker_id == 0) { |
| 342 | 4283 // let's allow task 0 to do this |
| 4284 if (concurrent()) { | |
|
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|
4285 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4286 // we need to set this to false before the next |
| 4287 // safepoint. This way we ensure that the marking phase | |
| 4288 // doesn't observe any more heap expansions. | |
| 4289 _cm->clear_concurrent_marking_in_progress(); | |
| 4290 } | |
| 4291 } | |
| 4292 | |
| 4293 // We can now guarantee that the global stack is empty, since | |
|
1023
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tonyp
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|
4294 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
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diff
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|
4295 // that, if a condition is false, we can immediately find out |
|
11d4857fe5e1
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|
4296 // which one. |
|
11d4857fe5e1
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|
4297 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
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|
4298 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
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|
4299 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
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|
4300 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
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|
4301 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
| 342 | 4302 |
|
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|
4303 if (_cm->verbose_low()) { |
|
6862
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|
4304 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
|
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|
4305 } |
| 342 | 4306 } else { |
| 4307 // Apparently there's more work to do. Let's abort this task. It | |
| 4308 // will restart it and we can hopefully find more things to do. | |
| 4309 | |
|
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|
4310 if (_cm->verbose_low()) { |
|
6862
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|
4311 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
|
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|
4312 _worker_id); |
|
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|
4313 } |
| 342 | 4314 |
| 4315 set_has_aborted(); | |
| 4316 statsOnly( ++_aborted_termination ); | |
| 4317 } | |
| 4318 } | |
| 4319 | |
| 4320 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4321 // closure which was statically allocated in this frame doesn't | |
| 4322 // escape it by accident. | |
| 3771 | 4323 set_cm_oop_closure(NULL); |
| 342 | 4324 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4325 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4326 // Update the step history. | |
| 4327 _step_times_ms.add(elapsed_time_ms); | |
| 4328 | |
| 4329 if (has_aborted()) { | |
| 4330 // The task was aborted for some reason. | |
| 4331 | |
| 4332 statsOnly( ++_aborted ); | |
| 4333 | |
|
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|
4334 if (_has_timed_out) { |
| 342 | 4335 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4336 // Keep statistics of how well we did with respect to hitting | |
| 4337 // our target only if we actually timed out (if we aborted for | |
| 4338 // other reasons, then the results might get skewed). | |
| 4339 _marking_step_diffs_ms.add(diff_ms); | |
| 4340 } | |
| 4341 | |
| 4342 if (_cm->has_overflown()) { | |
| 4343 // This is the interesting one. We aborted because a global | |
| 4344 // overflow was raised. This means we have to restart the | |
| 4345 // marking phase and start iterating over regions. However, in | |
| 4346 // order to do this we have to make sure that all tasks stop | |
| 4347 // what they are doing and re-initialise in a safe manner. We | |
| 4348 // will achieve this with the use of two barrier sync points. | |
| 4349 | |
|
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|
4350 if (_cm->verbose_low()) { |
|
6862
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|
4351 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
|
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|
4352 } |
| 342 | 4353 |
|
8787
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|
4354 if (!is_serial) { |
|
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|
4355 // We only need to enter the sync barrier if being called |
|
fa08949fe0cb
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|
4356 // from a parallel context |
|
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|
4357 _cm->enter_first_sync_barrier(_worker_id); |
|
fa08949fe0cb
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|
4358 |
|
fa08949fe0cb
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|
4359 // When we exit this sync barrier we know that all tasks have |
|
fa08949fe0cb
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|
4360 // stopped doing marking work. So, it's now safe to |
|
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|
4361 // re-initialise our data structures. At the end of this method, |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4362 // task 0 will clear the global data structures. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4363 } |
| 342 | 4364 |
| 4365 statsOnly( ++_aborted_overflow ); | |
| 4366 | |
| 4367 // We clear the local state of this task... | |
| 4368 clear_region_fields(); | |
| 4369 | |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4370 if (!is_serial) { |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4371 // ...and enter the second barrier. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4372 _cm->enter_second_sync_barrier(_worker_id); |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4373 } |
| 342 | 4374 // At this point everything has bee re-initialised and we're |
| 4375 // ready to restart. | |
| 4376 } | |
| 4377 | |
| 4378 if (_cm->verbose_low()) { | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4379 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
| 342 | 4380 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4381 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4382 if (_cm->has_aborted()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4383 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4384 _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4385 } |
| 342 | 4386 } |
| 4387 } else { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4388 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4389 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 342 | 4390 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4391 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4392 } |
| 342 | 4393 } |
| 4394 | |
| 4395 _claimed = false; | |
| 4396 } | |
| 4397 | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4398 CMTask::CMTask(uint worker_id, |
| 342 | 4399 ConcurrentMark* cm, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4400 size_t* marked_bytes, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4401 BitMap* card_bm, |
| 342 | 4402 CMTaskQueue* task_queue, |
| 4403 CMTaskQueueSet* task_queues) | |
| 4404 : _g1h(G1CollectedHeap::heap()), | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4405 _worker_id(worker_id), _cm(cm), |
| 342 | 4406 _claimed(false), |
| 4407 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4408 _task_queue(task_queue), | |
| 4409 _task_queues(task_queues), | |
| 3771 | 4410 _cm_oop_closure(NULL), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4411 _marked_bytes_array(marked_bytes), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4412 _card_bm(card_bm) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4413 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4414 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4415 |
| 4416 statsOnly( _clock_due_to_scanning = 0; | |
| 4417 _clock_due_to_marking = 0 ); | |
| 4418 | |
| 4419 _marking_step_diffs_ms.add(0.5); | |
| 4420 } | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4421 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4422 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4423 // consistent formatting. The *_H_* versions are used to format the |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4424 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4425 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4426 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4427 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4428 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4429 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4430 // identify them easily in a large log file. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4431 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4432 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4433 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4434 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4435 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4436 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4437 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4438 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4439 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4440 // For per-region info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4441 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4442 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4443 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4444 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4445 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4446 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4447 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4448 // For summary info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4449 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4450 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4451 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4452 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4453 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4454 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4455 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4456 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4457 _total_used_bytes(0), _total_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4458 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4459 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4460 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4461 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4462 MemRegion g1_committed = g1h->g1_committed(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4463 MemRegion g1_reserved = g1h->g1_reserved(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4464 double now = os::elapsedTime(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4465 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4466 // Print the header 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
|
4467 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4468 _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
tonyp
parents:
2369
diff
changeset
|
4469 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4470 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4471 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4472 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4473 g1_committed.start(), g1_committed.end(), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4474 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4475 HeapRegion::GrainBytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4476 _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
|
4477 _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
|
4478 G1PPRL_TYPE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4479 G1PPRL_ADDR_BASE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4480 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4481 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4482 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4483 G1PPRL_DOUBLE_H_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4484 "type", "address-range", |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4485 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4486 _out->print_cr(G1PPRL_LINE_PREFIX |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4487 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4488 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4489 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4490 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4491 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4492 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4493 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4494 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4495 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4496 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4497 // 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
tonyp
parents:
2369
diff
changeset
|
4498 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4499 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4500 // is < the region size), and updates the _hum_* field accordingly. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4501 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4502 size_t bytes = 0; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4503 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4504 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4505 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4506 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4507 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4508 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4509 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4510 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4511 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4512 // It deduces the values for a region in a humongous region series |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4513 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4514 // 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
tonyp
parents:
2369
diff
changeset
|
4515 // humongous" region and we visit the regions in address order. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4516 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4517 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4518 size_t* 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
|
4519 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4520 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
tonyp
parents:
2369
diff
changeset
|
4521 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4522 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4523 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4524 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4525 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4526 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4527 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4528 const char* type = ""; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4529 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4530 HeapWord* end = r->end(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4531 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4532 size_t used_bytes = r->used(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4533 size_t prev_live_bytes = r->live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4534 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4535 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4536 if (r->used() == 0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4537 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4538 } else if (r->is_survivor()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4539 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4540 } else if (r->is_young()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4541 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4542 } else if (r->startsHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4543 type = "HUMS"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4544 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4545 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4546 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4547 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4548 // Set up the _hum_* fields. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4549 _hum_capacity_bytes = capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4550 _hum_used_bytes = used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4551 _hum_prev_live_bytes = 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
|
4552 _hum_next_live_bytes = next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4553 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4554 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4555 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4556 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4557 type = "HUMC"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4558 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4559 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4560 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4561 } else { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4562 type = "OLD"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4563 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4564 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4565 _total_used_bytes += used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4566 _total_capacity_bytes += capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4567 _total_prev_live_bytes += 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
|
4568 _total_next_live_bytes += next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4569 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4570 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4571 _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
|
4572 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4573 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4574 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4575 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4576 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4577 G1PPRL_DOUBLE_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4578 type, bottom, end, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4579 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4580 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4581 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4582 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4583 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4584 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4585 // 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
|
4586 _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
|
4587 _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
|
4588 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4589 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4590 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
|
4591 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4592 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4593 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
|
4594 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
|
4595 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
|
4596 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
|
4597 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
|
4598 bytes_to_mb(_total_next_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4599 perc(_total_next_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
|
4600 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4601 } |