Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 20192:581e70386ec9
8039147: Cleanup SuspendibleThreadSet
Reviewed-by: brutisso, tschatzl, mgerdin
author | pliden |
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date | Fri, 11 Apr 2014 12:29:24 +0200 |
parents | 0982ec23da03 |
children | c49dcaf78a65 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
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" |
10405 | 39 #include "gc_implementation/shared/gcTimer.hpp" |
40 #include "gc_implementation/shared/gcTrace.hpp" | |
41 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 42 #include "memory/genOopClosures.inline.hpp" |
43 #include "memory/referencePolicy.hpp" | |
44 #include "memory/resourceArea.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "runtime/handles.inline.hpp" | |
47 #include "runtime/java.hpp" | |
6197 | 48 #include "services/memTracker.hpp" |
342 | 49 |
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50 // Concurrent marking bit map wrapper |
342 | 51 |
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52 CMBitMapRO::CMBitMapRO(int shifter) : |
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53 _bm(), |
342 | 54 _shifter(shifter) { |
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55 _bmStartWord = 0; |
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56 _bmWordSize = 0; |
342 | 57 } |
58 | |
59 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
60 HeapWord* limit) const { | |
61 // First we must round addr *up* to a possible object boundary. | |
62 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
63 HeapWordSize << _shifter); | |
64 size_t addrOffset = heapWordToOffset(addr); | |
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65 if (limit == NULL) { |
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66 limit = _bmStartWord + _bmWordSize; |
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67 } |
342 | 68 size_t limitOffset = heapWordToOffset(limit); |
69 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
70 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
71 assert(nextAddr >= addr, "get_next_one postcondition"); | |
72 assert(nextAddr == limit || isMarked(nextAddr), | |
73 "get_next_one postcondition"); | |
74 return nextAddr; | |
75 } | |
76 | |
77 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
78 HeapWord* limit) const { | |
79 size_t addrOffset = heapWordToOffset(addr); | |
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80 if (limit == NULL) { |
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81 limit = _bmStartWord + _bmWordSize; |
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82 } |
342 | 83 size_t limitOffset = heapWordToOffset(limit); |
84 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
85 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
86 assert(nextAddr >= addr, "get_next_one postcondition"); | |
87 assert(nextAddr == limit || !isMarked(nextAddr), | |
88 "get_next_one postcondition"); | |
89 return nextAddr; | |
90 } | |
91 | |
92 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
93 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
94 return (int) (diff >> _shifter); | |
95 } | |
96 | |
97 #ifndef PRODUCT | |
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98 bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
342 | 99 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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100 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 101 "size inconsistency"); |
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102 return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
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103 _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
342 | 104 } |
105 #endif | |
106 | |
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107 void CMBitMapRO::print_on_error(outputStream* st, const char* prefix) const { |
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108 _bm.print_on_error(st, prefix); |
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109 } |
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110 |
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111 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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112 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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113 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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114 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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115 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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116 if (!brs.is_reserved()) { |
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117 warning("ConcurrentMark marking bit map allocation failure"); |
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118 return false; |
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119 } |
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120 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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121 // For now we'll just commit all of the bit map up front. |
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122 // Later on we'll try to be more parsimonious with swap. |
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123 if (!_virtual_space.initialize(brs, brs.size())) { |
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124 warning("ConcurrentMark marking bit map backing store failure"); |
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125 return false; |
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126 } |
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127 assert(_virtual_space.committed_size() == brs.size(), |
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128 "didn't reserve backing store for all of concurrent marking bit map?"); |
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129 _bm.set_map((uintptr_t*)_virtual_space.low()); |
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130 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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131 _bmWordSize, "inconsistency in bit map sizing"); |
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132 _bm.set_size(_bmWordSize >> _shifter); |
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133 return true; |
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134 } |
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135 |
342 | 136 void CMBitMap::clearAll() { |
137 _bm.clear(); | |
138 return; | |
139 } | |
140 | |
141 void CMBitMap::markRange(MemRegion mr) { | |
142 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
143 assert(!mr.is_empty(), "unexpected empty region"); | |
144 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
145 ((HeapWord *) mr.end())), | |
146 "markRange memory region end is not card aligned"); | |
147 // convert address range into offset range | |
148 _bm.at_put_range(heapWordToOffset(mr.start()), | |
149 heapWordToOffset(mr.end()), true); | |
150 } | |
151 | |
152 void CMBitMap::clearRange(MemRegion mr) { | |
153 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
154 assert(!mr.is_empty(), "unexpected empty region"); | |
155 // convert address range into offset range | |
156 _bm.at_put_range(heapWordToOffset(mr.start()), | |
157 heapWordToOffset(mr.end()), false); | |
158 } | |
159 | |
160 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
161 HeapWord* end_addr) { | |
162 HeapWord* start = getNextMarkedWordAddress(addr); | |
163 start = MIN2(start, end_addr); | |
164 HeapWord* end = getNextUnmarkedWordAddress(start); | |
165 end = MIN2(end, end_addr); | |
166 assert(start <= end, "Consistency check"); | |
167 MemRegion mr(start, end); | |
168 if (!mr.is_empty()) { | |
169 clearRange(mr); | |
170 } | |
171 return mr; | |
172 } | |
173 | |
174 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
175 _base(NULL), _cm(cm) | |
176 #ifdef ASSERT | |
177 , _drain_in_progress(false) | |
178 , _drain_in_progress_yields(false) | |
179 #endif | |
180 {} | |
181 | |
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182 bool CMMarkStack::allocate(size_t capacity) { |
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183 // allocate a stack of the requisite depth |
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184 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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185 if (!rs.is_reserved()) { |
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186 warning("ConcurrentMark MarkStack allocation failure"); |
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187 return false; |
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188 } |
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189 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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190 if (!_virtual_space.initialize(rs, rs.size())) { |
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191 warning("ConcurrentMark MarkStack backing store failure"); |
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192 // Release the virtual memory reserved for the marking stack |
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193 rs.release(); |
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194 return false; |
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195 } |
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196 assert(_virtual_space.committed_size() == rs.size(), |
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197 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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198 _base = (oop*) _virtual_space.low(); |
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199 setEmpty(); |
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200 _capacity = (jint) capacity; |
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201 _saved_index = -1; |
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202 _should_expand = false; |
342 | 203 NOT_PRODUCT(_max_depth = 0); |
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204 return true; |
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205 } |
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206 |
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207 void CMMarkStack::expand() { |
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208 // Called, during remark, if we've overflown the marking stack during marking. |
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209 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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210 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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211 // Clear expansion flag |
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212 _should_expand = false; |
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213 if (_capacity == (jint) MarkStackSizeMax) { |
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214 if (PrintGCDetails && Verbose) { |
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215 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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216 } |
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217 return; |
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218 } |
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219 // Double capacity if possible |
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220 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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221 // Do not give up existing stack until we have managed to |
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222 // get the double capacity that we desired. |
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223 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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224 sizeof(oop))); |
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225 if (rs.is_reserved()) { |
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226 // Release the backing store associated with old stack |
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227 _virtual_space.release(); |
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228 // Reinitialize virtual space for new stack |
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229 if (!_virtual_space.initialize(rs, rs.size())) { |
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230 fatal("Not enough swap for expanded marking stack capacity"); |
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231 } |
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232 _base = (oop*)(_virtual_space.low()); |
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233 _index = 0; |
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234 _capacity = new_capacity; |
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235 } else { |
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236 if (PrintGCDetails && Verbose) { |
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237 // Failed to double capacity, continue; |
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238 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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239 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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240 _capacity / K, new_capacity / K); |
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241 } |
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242 } |
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243 } |
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244 |
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245 void CMMarkStack::set_should_expand() { |
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246 // If we're resetting the marking state because of an |
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247 // marking stack overflow, record that we should, if |
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248 // possible, expand the stack. |
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249 _should_expand = _cm->has_overflown(); |
342 | 250 } |
251 | |
252 CMMarkStack::~CMMarkStack() { | |
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253 if (_base != NULL) { |
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254 _base = NULL; |
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255 _virtual_space.release(); |
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256 } |
342 | 257 } |
258 | |
259 void CMMarkStack::par_push(oop ptr) { | |
260 while (true) { | |
261 if (isFull()) { | |
262 _overflow = true; | |
263 return; | |
264 } | |
265 // Otherwise... | |
266 jint index = _index; | |
267 jint next_index = index+1; | |
268 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
269 if (res == index) { | |
270 _base[index] = ptr; | |
271 // Note that we don't maintain this atomically. We could, but it | |
272 // doesn't seem necessary. | |
273 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
274 return; | |
275 } | |
276 // Otherwise, we need to try again. | |
277 } | |
278 } | |
279 | |
280 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
281 while (true) { | |
282 if (isFull()) { | |
283 _overflow = true; | |
284 return; | |
285 } | |
286 // Otherwise... | |
287 jint index = _index; | |
288 jint next_index = index + n; | |
289 if (next_index > _capacity) { | |
290 _overflow = true; | |
291 return; | |
292 } | |
293 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
294 if (res == index) { | |
295 for (int i = 0; i < n; i++) { | |
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296 int ind = index + i; |
342 | 297 assert(ind < _capacity, "By overflow test above."); |
298 _base[ind] = ptr_arr[i]; | |
299 } | |
300 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
301 return; | |
302 } | |
303 // Otherwise, we need to try again. | |
304 } | |
305 } | |
306 | |
307 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
308 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
309 jint start = _index; | |
310 jint next_index = start + n; | |
311 if (next_index > _capacity) { | |
312 _overflow = true; | |
313 return; | |
314 } | |
315 // Otherwise. | |
316 _index = next_index; | |
317 for (int i = 0; i < n; i++) { | |
318 int ind = start + i; | |
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319 assert(ind < _capacity, "By overflow test above."); |
342 | 320 _base[ind] = ptr_arr[i]; |
321 } | |
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322 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 323 } |
324 | |
325 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
326 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
327 jint index = _index; | |
328 if (index == 0) { | |
329 *n = 0; | |
330 return false; | |
331 } else { | |
332 int k = MIN2(max, index); | |
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333 jint new_ind = index - k; |
342 | 334 for (int j = 0; j < k; j++) { |
335 ptr_arr[j] = _base[new_ind + j]; | |
336 } | |
337 _index = new_ind; | |
338 *n = k; | |
339 return true; | |
340 } | |
341 } | |
342 | |
343 template<class OopClosureClass> | |
344 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
345 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
346 || SafepointSynchronize::is_at_safepoint(), | |
347 "Drain recursion must be yield-safe."); | |
348 bool res = true; | |
349 debug_only(_drain_in_progress = true); | |
350 debug_only(_drain_in_progress_yields = yield_after); | |
351 while (!isEmpty()) { | |
352 oop newOop = pop(); | |
353 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
354 assert(newOop->is_oop(), "Expected an oop"); | |
355 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
356 "only grey objects on this stack"); | |
357 newOop->oop_iterate(cl); | |
358 if (yield_after && _cm->do_yield_check()) { | |
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359 res = false; |
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360 break; |
342 | 361 } |
362 } | |
363 debug_only(_drain_in_progress = false); | |
364 return res; | |
365 } | |
366 | |
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367 void CMMarkStack::note_start_of_gc() { |
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368 assert(_saved_index == -1, |
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369 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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370 _saved_index = _index; |
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371 } |
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372 |
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373 void CMMarkStack::note_end_of_gc() { |
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374 // This is intentionally a guarantee, instead of an assert. If we |
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375 // accidentally add something to the mark stack during GC, it |
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376 // will be a correctness issue so it's better if we crash. we'll |
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377 // only check this once per GC anyway, so it won't be a performance |
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378 // issue in any way. |
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379 guarantee(_saved_index == _index, |
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380 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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381 _saved_index = -1; |
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382 } |
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383 |
342 | 384 void CMMarkStack::oops_do(OopClosure* f) { |
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385 assert(_saved_index == _index, |
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386 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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387 for (int i = 0; i < _index; i += 1) { |
342 | 388 f->do_oop(&_base[i]); |
389 } | |
390 } | |
391 | |
392 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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393 return _g1h->is_obj_ill(obj); |
342 | 394 } |
395 | |
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396 CMRootRegions::CMRootRegions() : |
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397 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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398 _should_abort(false), _next_survivor(NULL) { } |
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399 |
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400 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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401 _young_list = g1h->young_list(); |
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402 _cm = cm; |
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403 } |
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404 |
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405 void CMRootRegions::prepare_for_scan() { |
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406 assert(!scan_in_progress(), "pre-condition"); |
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407 |
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408 // Currently, only survivors can be root regions. |
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409 assert(_next_survivor == NULL, "pre-condition"); |
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410 _next_survivor = _young_list->first_survivor_region(); |
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411 _scan_in_progress = (_next_survivor != NULL); |
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412 _should_abort = false; |
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413 } |
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414 |
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415 HeapRegion* CMRootRegions::claim_next() { |
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416 if (_should_abort) { |
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417 // If someone has set the should_abort flag, we return NULL to |
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418 // force the caller to bail out of their loop. |
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419 return NULL; |
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420 } |
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421 |
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422 // Currently, only survivors can be root regions. |
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423 HeapRegion* res = _next_survivor; |
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424 if (res != NULL) { |
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425 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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426 // Read it again in case it changed while we were waiting for the lock. |
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427 res = _next_survivor; |
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428 if (res != NULL) { |
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429 if (res == _young_list->last_survivor_region()) { |
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430 // We just claimed the last survivor so store NULL to indicate |
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431 // that we're done. |
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432 _next_survivor = NULL; |
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433 } else { |
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434 _next_survivor = res->get_next_young_region(); |
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435 } |
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436 } else { |
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437 // Someone else claimed the last survivor while we were trying |
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438 // to take the lock so nothing else to do. |
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439 } |
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440 } |
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441 assert(res == NULL || res->is_survivor(), "post-condition"); |
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442 |
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443 return res; |
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444 } |
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445 |
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446 void CMRootRegions::scan_finished() { |
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447 assert(scan_in_progress(), "pre-condition"); |
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448 |
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449 // Currently, only survivors can be root regions. |
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450 if (!_should_abort) { |
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451 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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452 } |
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453 _next_survivor = NULL; |
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454 |
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455 { |
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456 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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457 _scan_in_progress = false; |
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458 RootRegionScan_lock->notify_all(); |
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459 } |
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460 } |
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461 |
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462 bool CMRootRegions::wait_until_scan_finished() { |
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463 if (!scan_in_progress()) return false; |
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464 |
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465 { |
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466 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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467 while (scan_in_progress()) { |
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468 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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469 } |
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470 } |
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471 return true; |
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472 } |
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473 |
342 | 474 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
475 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
476 #endif // _MSC_VER | |
477 | |
4728
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478 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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479 return MAX2((n_par_threads + 2) / 4, 1U); |
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480 } |
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481 |
7397
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482 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
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483 _g1h(g1h), |
12229
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8021823: G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
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484 _markBitMap1(log2_intptr(MinObjAlignment)), |
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8021823: G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
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485 _markBitMap2(log2_intptr(MinObjAlignment)), |
342 | 486 _parallel_marking_threads(0), |
4095
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487 _max_parallel_marking_threads(0), |
342 | 488 _sleep_factor(0.0), |
489 _marking_task_overhead(1.0), | |
490 _cleanup_sleep_factor(0.0), | |
491 _cleanup_task_overhead(1.0), | |
2152 | 492 _cleanup_list("Cleanup List"), |
7397
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493 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
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494 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
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495 CardTableModRefBS::card_shift, |
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496 false /* in_resource_area*/), |
4836
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497 |
342 | 498 _prevMarkBitMap(&_markBitMap1), |
499 _nextMarkBitMap(&_markBitMap2), | |
500 | |
501 _markStack(this), | |
502 // _finger set in set_non_marking_state | |
503 | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
504 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 505 // _active_tasks set in set_non_marking_state |
506 // _tasks set inside the constructor | |
6862
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507 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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508 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 509 |
510 _has_overflown(false), | |
511 _concurrent(false), | |
619
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6814467: G1: small fixes related to concurrent marking verboseness
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diff
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|
512 _has_aborted(false), |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
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513 _aborted_gc_id(GCId::undefined()), |
619
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470
diff
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|
514 _restart_for_overflow(false), |
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470
diff
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|
515 _concurrent_marking_in_progress(false), |
342 | 516 |
517 // _verbose_level set below | |
518 | |
519 _init_times(), | |
520 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
521 _cleanup_times(), | |
522 _total_counting_time(0.0), | |
523 _total_rs_scrub_time(0.0), | |
4836
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524 |
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525 _parallel_workers(NULL), |
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|
526 |
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527 _count_card_bitmaps(NULL), |
7397
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528 _count_marked_bytes(NULL), |
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529 _completed_initialization(false) { |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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530 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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|
531 if (verbose_level < no_verbose) { |
342 | 532 verbose_level = no_verbose; |
3776
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|
533 } |
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|
534 if (verbose_level > high_verbose) { |
342 | 535 verbose_level = high_verbose; |
3776
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|
536 } |
342 | 537 _verbose_level = verbose_level; |
538 | |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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539 if (verbose_low()) { |
342 | 540 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
541 "heap end = " INTPTR_FORMAT, p2i(_heap_start), p2i(_heap_end)); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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542 } |
342 | 543 |
7397
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544 if (!_markBitMap1.allocate(heap_rs)) { |
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545 warning("Failed to allocate first CM bit map"); |
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546 return; |
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|
547 } |
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|
548 if (!_markBitMap2.allocate(heap_rs)) { |
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549 warning("Failed to allocate second CM bit map"); |
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550 return; |
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|
551 } |
342 | 552 |
553 // Create & start a ConcurrentMark thread. | |
845
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554 _cmThread = new ConcurrentMarkThread(this); |
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555 assert(cmThread() != NULL, "CM Thread should have been created"); |
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6700789: G1: Enable use of compressed oops with G1 heaps
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556 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
13437
1de8e5356754
8029326: G1 does not check if threads gets created
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|
557 if (_cmThread->osthread() == NULL) { |
1de8e5356754
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diff
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|
558 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
1de8e5356754
8029326: G1 does not check if threads gets created
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559 } |
845
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560 |
342 | 561 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
7397
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562 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
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563 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 564 |
565 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 566 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 567 |
4837
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568 _root_regions.init(_g1h, this); |
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569 |
1284 | 570 if (ConcGCThreads > ParallelGCThreads) { |
17937
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571 warning("Can't have more ConcGCThreads (" UINTX_FORMAT ") " |
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572 "than ParallelGCThreads (" UINTX_FORMAT ").", |
7397
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573 ConcGCThreads, ParallelGCThreads); |
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574 return; |
342 | 575 } |
576 if (ParallelGCThreads == 0) { | |
577 // if we are not running with any parallel GC threads we will not | |
578 // spawn any marking threads either | |
4095
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|
579 _parallel_marking_threads = 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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580 _max_parallel_marking_threads = 0; |
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|
581 _sleep_factor = 0.0; |
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|
582 _marking_task_overhead = 1.0; |
342 | 583 } else { |
8006
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
584 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
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|
585 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 586 // if both are set |
587 _sleep_factor = 0.0; | |
588 _marking_task_overhead = 1.0; | |
751 | 589 } else if (G1MarkingOverheadPercent > 0) { |
8006
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8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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590 // We will calculate the number of parallel marking threads based |
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591 // on a target overhead with respect to the soft real-time goal |
751 | 592 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 593 double overall_cm_overhead = |
751 | 594 (double) MaxGCPauseMillis * marking_overhead / |
595 (double) GCPauseIntervalMillis; | |
342 | 596 double cpu_ratio = 1.0 / (double) os::processor_count(); |
597 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
598 double marking_task_overhead = | |
599 overall_cm_overhead / marking_thread_num * | |
600 (double) os::processor_count(); | |
601 double sleep_factor = | |
602 (1.0 - marking_task_overhead) / marking_task_overhead; | |
603 | |
8006
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
604 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 605 _sleep_factor = sleep_factor; |
606 _marking_task_overhead = marking_task_overhead; | |
607 } else { | |
8006
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8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
608 // Calculate the number of parallel marking threads by scaling |
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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609 // the number of parallel GC threads. |
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610 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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611 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 612 _sleep_factor = 0.0; |
613 _marking_task_overhead = 1.0; | |
614 } | |
615 | |
8006
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616 assert(ConcGCThreads > 0, "Should have been set"); |
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617 _parallel_marking_threads = (uint) ConcGCThreads; |
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618 _max_parallel_marking_threads = _parallel_marking_threads; |
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619 |
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620 if (parallel_marking_threads() > 1) { |
342 | 621 _cleanup_task_overhead = 1.0; |
3776
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622 } else { |
342 | 623 _cleanup_task_overhead = marking_task_overhead(); |
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624 } |
342 | 625 _cleanup_sleep_factor = |
626 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
627 | |
628 #if 0 | |
629 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
630 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
631 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
632 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
633 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
634 #endif | |
635 | |
1023
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636 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
1833
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637 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
4728
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638 _max_parallel_marking_threads, false, true); |
1833
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639 if (_parallel_workers == NULL) { |
342 | 640 vm_exit_during_initialization("Failed necessary allocation."); |
1833
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641 } else { |
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642 _parallel_workers->initialize_workers(); |
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643 } |
342 | 644 } |
645 | |
7397
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646 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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647 uintx mark_stack_size = |
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648 MIN2(MarkStackSizeMax, |
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649 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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650 // Verify that the calculated value for MarkStackSize is in range. |
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651 // It would be nice to use the private utility routine from Arguments. |
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652 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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653 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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654 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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655 mark_stack_size, (uintx) 1, MarkStackSizeMax); |
7397
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656 return; |
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657 } |
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658 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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659 } else { |
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660 // Verify MarkStackSize is in range. |
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661 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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662 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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663 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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664 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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665 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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666 MarkStackSize, (uintx) 1, MarkStackSizeMax); |
7397
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667 return; |
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668 } |
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669 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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670 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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671 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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672 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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673 MarkStackSize, MarkStackSizeMax); |
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674 return; |
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675 } |
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676 } |
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677 } |
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678 } |
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679 |
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680 if (!_markStack.allocate(MarkStackSize)) { |
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681 warning("Failed to allocate CM marking stack"); |
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682 return; |
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683 } |
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684 |
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685 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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686 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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687 |
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688 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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689 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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690 |
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691 BitMap::idx_t card_bm_size = _card_bm.size(); |
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692 |
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693 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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694 _active_tasks = _max_worker_id; |
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695 |
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696 size_t max_regions = (size_t) _g1h->max_regions(); |
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697 for (uint i = 0; i < _max_worker_id; ++i) { |
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698 CMTaskQueue* task_queue = new CMTaskQueue(); |
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699 task_queue->initialize(); |
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700 _task_queues->register_queue(i, task_queue); |
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701 |
442f942757c0
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702 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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703 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
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704 |
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705 _tasks[i] = new CMTask(i, this, |
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706 _count_marked_bytes[i], |
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707 &_count_card_bitmaps[i], |
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708 task_queue, _task_queues); |
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709 |
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710 _accum_task_vtime[i] = 0.0; |
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711 } |
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|
712 |
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713 // Calculate the card number for the bottom of the heap. Used |
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714 // in biasing indexes into the accounting card bitmaps. |
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715 _heap_bottom_card_num = |
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716 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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717 CardTableModRefBS::card_shift); |
442f942757c0
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|
718 |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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719 // Clear all the liveness counting data |
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720 clear_all_count_data(); |
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721 |
342 | 722 // so that the call below can read a sensible value |
7397
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723 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 724 set_non_marking_state(); |
7397
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725 _completed_initialization = true; |
342 | 726 } |
727 | |
728 void ConcurrentMark::update_g1_committed(bool force) { | |
729 // If concurrent marking is not in progress, then we do not need to | |
5988
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|
730 // update _heap_end. |
3776
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|
731 if (!concurrent_marking_in_progress() && !force) return; |
342 | 732 |
733 MemRegion committed = _g1h->g1_committed(); | |
1023
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734 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 735 HeapWord* new_end = committed.end(); |
736 if (new_end > _heap_end) { | |
737 // The heap has been expanded. | |
738 | |
739 _heap_end = new_end; | |
740 } | |
741 // Notice that the heap can also shrink. However, this only happens | |
742 // during a Full GC (at least currently) and the entire marking | |
743 // phase will bail out and the task will not be restarted. So, let's | |
744 // do nothing. | |
745 } | |
746 | |
747 void ConcurrentMark::reset() { | |
748 // Starting values for these two. This should be called in a STW | |
749 // phase. CM will be notified of any future g1_committed expansions | |
750 // will be at the end of evacuation pauses, when tasks are | |
751 // inactive. | |
752 MemRegion committed = _g1h->g1_committed(); | |
753 _heap_start = committed.start(); | |
754 _heap_end = committed.end(); | |
755 | |
1023
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756 // Separated the asserts so that we know which one fires. |
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757 assert(_heap_start != NULL, "heap bounds should look ok"); |
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758 assert(_heap_end != NULL, "heap bounds should look ok"); |
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759 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 760 |
7450
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761 // Reset all the marking data structures and any necessary flags |
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762 reset_marking_state(); |
342 | 763 |
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764 if (verbose_low()) { |
342 | 765 gclog_or_tty->print_cr("[global] resetting"); |
3776
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766 } |
342 | 767 |
768 // We do reset all of them, since different phases will use | |
769 // different number of active threads. So, it's easiest to have all | |
770 // of them ready. | |
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771 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 772 _tasks[i]->reset(_nextMarkBitMap); |
1835
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773 } |
342 | 774 |
775 // we need this to make sure that the flag is on during the evac | |
776 // pause with initial mark piggy-backed | |
777 set_concurrent_marking_in_progress(); | |
778 } | |
779 | |
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780 |
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781 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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782 _markStack.set_should_expand(); |
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783 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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784 if (clear_overflow) { |
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785 clear_has_overflown(); |
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786 } else { |
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787 assert(has_overflown(), "pre-condition"); |
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788 } |
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789 _finger = _heap_start; |
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790 |
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791 for (uint i = 0; i < _max_worker_id; ++i) { |
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792 CMTaskQueue* queue = _task_queues->queue(i); |
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793 queue->set_empty(); |
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794 } |
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795 } |
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796 |
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797 void ConcurrentMark::set_concurrency(uint active_tasks) { |
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798 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 799 |
800 _active_tasks = active_tasks; | |
801 // Need to update the three data structures below according to the | |
802 // number of active threads for this phase. | |
803 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
804 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
805 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
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806 } |
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807 |
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808 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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809 set_concurrency(active_tasks); |
342 | 810 |
811 _concurrent = concurrent; | |
812 // We propagate this to all tasks, not just the active ones. | |
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813 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 814 _tasks[i]->set_concurrent(concurrent); |
815 | |
816 if (concurrent) { | |
817 set_concurrent_marking_in_progress(); | |
818 } else { | |
819 // We currently assume that the concurrent flag has been set to | |
820 // false before we start remark. At this point we should also be | |
821 // in a STW phase. | |
1023
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822 assert(!concurrent_marking_in_progress(), "invariant"); |
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823 assert(out_of_regions(), |
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824 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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825 p2i(_finger), p2i(_heap_end))); |
342 | 826 update_g1_committed(true); |
827 } | |
828 } | |
829 | |
830 void ConcurrentMark::set_non_marking_state() { | |
831 // We set the global marking state to some default values when we're | |
832 // not doing marking. | |
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833 reset_marking_state(); |
342 | 834 _active_tasks = 0; |
835 clear_concurrent_marking_in_progress(); | |
836 } | |
837 | |
838 ConcurrentMark::~ConcurrentMark() { | |
4735 | 839 // The ConcurrentMark instance is never freed. |
840 ShouldNotReachHere(); | |
342 | 841 } |
842 | |
843 void ConcurrentMark::clearNextBitmap() { | |
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844 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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845 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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846 |
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847 // Make sure that the concurrent mark thread looks to still be in |
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848 // the current cycle. |
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849 guarantee(cmThread()->during_cycle(), "invariant"); |
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850 |
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851 // We are finishing up the current cycle by clearing the next |
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852 // marking bitmap and getting it ready for the next cycle. During |
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853 // this time no other cycle can start. So, let's make sure that this |
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854 // is the case. |
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855 guarantee(!g1h->mark_in_progress(), "invariant"); |
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856 |
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857 // clear the mark bitmap (no grey objects to start with). |
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858 // We need to do this in chunks and offer to yield in between |
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859 // each chunk. |
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860 HeapWord* start = _nextMarkBitMap->startWord(); |
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861 HeapWord* end = _nextMarkBitMap->endWord(); |
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862 HeapWord* cur = start; |
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863 size_t chunkSize = M; |
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864 while (cur < end) { |
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865 HeapWord* next = cur + chunkSize; |
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866 if (next > end) { |
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867 next = end; |
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868 } |
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869 MemRegion mr(cur,next); |
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870 _nextMarkBitMap->clearRange(mr); |
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871 cur = next; |
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872 do_yield_check(); |
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873 |
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874 // Repeat the asserts from above. We'll do them as asserts here to |
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875 // minimize their overhead on the product. However, we'll have |
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876 // them as guarantees at the beginning / end of the bitmap |
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877 // clearing to get some checking in the product. |
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878 assert(cmThread()->during_cycle(), "invariant"); |
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879 assert(!g1h->mark_in_progress(), "invariant"); |
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880 } |
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881 |
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882 // Clear the liveness counting data |
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883 clear_all_count_data(); |
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884 |
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885 // Repeat the asserts from above. |
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886 guarantee(cmThread()->during_cycle(), "invariant"); |
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887 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 888 } |
889 | |
890 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
891 public: | |
892 bool doHeapRegion(HeapRegion* r) { | |
893 if (!r->continuesHumongous()) { | |
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894 r->note_start_of_marking(); |
342 | 895 } |
896 return false; | |
897 } | |
898 }; | |
899 | |
900 void ConcurrentMark::checkpointRootsInitialPre() { | |
901 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
902 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
903 | |
904 _has_aborted = false; | |
905 | |
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906 #ifndef PRODUCT |
1044 | 907 if (G1PrintReachableAtInitialMark) { |
1388 | 908 print_reachable("at-cycle-start", |
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909 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 910 } |
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911 #endif |
342 | 912 |
913 // Initialise marking structures. This has to be done in a STW phase. | |
914 reset(); | |
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915 |
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916 // For each region note start of marking. |
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917 NoteStartOfMarkHRClosure startcl; |
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918 g1h->heap_region_iterate(&startcl); |
342 | 919 } |
920 | |
921 | |
922 void ConcurrentMark::checkpointRootsInitialPost() { | |
923 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
924 | |
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925 // If we force an overflow during remark, the remark operation will |
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926 // actually abort and we'll restart concurrent marking. If we always |
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927 // force an oveflow during remark we'll never actually complete the |
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928 // marking phase. So, we initilize this here, at the start of the |
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929 // cycle, so that at the remaining overflow number will decrease at |
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930 // every remark and we'll eventually not need to cause one. |
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931 force_overflow_stw()->init(); |
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932 |
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933 // Start Concurrent Marking weak-reference discovery. |
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934 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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935 // enable ("weak") refs discovery |
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936 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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937 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 938 |
939 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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940 // This is the start of the marking cycle, we're expected all |
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941 // threads to have SATB queues with active set to false. |
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942 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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943 false /* expected_active */); |
342 | 944 |
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945 _root_regions.prepare_for_scan(); |
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946 |
342 | 947 // update_g1_committed() will be called at the end of an evac pause |
948 // when marking is on. So, it's also called at the end of the | |
949 // initial-mark pause to update the heap end, if the heap expands | |
950 // during it. No need to call it here. | |
951 } | |
952 | |
953 /* | |
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954 * Notice that in the next two methods, we actually leave the STS |
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955 * during the barrier sync and join it immediately afterwards. If we |
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956 * do not do this, the following deadlock can occur: one thread could |
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957 * be in the barrier sync code, waiting for the other thread to also |
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958 * sync up, whereas another one could be trying to yield, while also |
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959 * waiting for the other threads to sync up too. |
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960 * |
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961 * Note, however, that this code is also used during remark and in |
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962 * this case we should not attempt to leave / enter the STS, otherwise |
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963 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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964 * (product). So we should only leave / enter the STS if we are |
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965 * operating concurrently. |
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966 * |
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967 * Because the thread that does the sync barrier has left the STS, it |
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968 * is possible to be suspended for a Full GC or an evacuation pause |
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969 * could occur. This is actually safe, since the entering the sync |
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970 * barrier is one of the last things do_marking_step() does, and it |
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971 * doesn't manipulate any data structures afterwards. |
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972 */ |
342 | 973 |
6862
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974 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
3776
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975 if (verbose_low()) { |
6862
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976 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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977 } |
342 | 978 |
3316
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979 if (concurrent()) { |
20192 | 980 SuspendibleThreadSet::leave(); |
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981 } |
17949
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982 |
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983 bool barrier_aborted = !_first_overflow_barrier_sync.enter(); |
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984 |
3316
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985 if (concurrent()) { |
20192 | 986 SuspendibleThreadSet::join(); |
3316
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987 } |
342 | 988 // at this point everyone should have synced up and not be doing any |
989 // more work | |
990 | |
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991 if (verbose_low()) { |
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992 if (barrier_aborted) { |
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993 gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id); |
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994 } else { |
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995 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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996 } |
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997 } |
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998 |
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999 if (barrier_aborted) { |
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1000 // If the barrier aborted we ignore the overflow condition and |
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1001 // just abort the whole marking phase as quickly as possible. |
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1002 return; |
3776
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1003 } |
342 | 1004 |
8788
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1005 // If we're executing the concurrent phase of marking, reset the marking |
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1006 // state; otherwise the marking state is reset after reference processing, |
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1007 // during the remark pause. |
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1008 // If we reset here as a result of an overflow during the remark we will |
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1009 // see assertion failures from any subsequent set_concurrency_and_phase() |
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1010 // calls. |
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1011 if (concurrent()) { |
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1012 // let the task associated with with worker 0 do this |
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1013 if (worker_id == 0) { |
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1014 // task 0 is responsible for clearing the global data structures |
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1015 // We should be here because of an overflow. During STW we should |
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1016 // not clear the overflow flag since we rely on it being true when |
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1017 // we exit this method to abort the pause and restart concurent |
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1018 // marking. |
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1019 reset_marking_state(true /* clear_overflow */); |
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1020 force_overflow()->update(); |
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1021 |
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1022 if (G1Log::fine()) { |
20190
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1023 gclog_or_tty->gclog_stamp(concurrent_gc_id()); |
8788
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1024 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1025 } |
342 | 1026 } |
1027 } | |
1028 | |
1029 // after this, each task should reset its own data structures then | |
1030 // then go into the second barrier | |
1031 } | |
1032 | |
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1033 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1034 if (verbose_low()) { |
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1035 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1036 } |
342 | 1037 |
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1038 if (concurrent()) { |
20192 | 1039 SuspendibleThreadSet::leave(); |
3316
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1040 } |
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1041 |
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1042 bool barrier_aborted = !_second_overflow_barrier_sync.enter(); |
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1043 |
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1044 if (concurrent()) { |
20192 | 1045 SuspendibleThreadSet::join(); |
3316
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1046 } |
8788
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1047 // at this point everything should be re-initialized and ready to go |
342 | 1048 |
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1049 if (verbose_low()) { |
17949
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1050 if (barrier_aborted) { |
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1051 gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id); |
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1052 } else { |
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1053 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1054 } |
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1055 } |
342 | 1056 } |
1057 | |
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1058 #ifndef PRODUCT |
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1059 void ForceOverflowSettings::init() { |
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1060 _num_remaining = G1ConcMarkForceOverflow; |
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1061 _force = false; |
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1062 update(); |
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1063 } |
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1064 |
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1065 void ForceOverflowSettings::update() { |
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1066 if (_num_remaining > 0) { |
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1067 _num_remaining -= 1; |
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1068 _force = true; |
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1069 } else { |
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1070 _force = false; |
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1071 } |
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1072 } |
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1073 |
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1074 bool ForceOverflowSettings::should_force() { |
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1075 if (_force) { |
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1076 _force = false; |
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1077 return true; |
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1078 } else { |
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1079 return false; |
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1080 } |
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1081 } |
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1082 #endif // !PRODUCT |
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1083 |
342 | 1084 class CMConcurrentMarkingTask: public AbstractGangTask { |
1085 private: | |
1086 ConcurrentMark* _cm; | |
1087 ConcurrentMarkThread* _cmt; | |
1088 | |
1089 public: | |
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1090 void work(uint worker_id) { |
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1091 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1092 "this should only be done by a conc GC thread"); |
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1093 ResourceMark rm; |
342 | 1094 |
1095 double start_vtime = os::elapsedVTime(); | |
1096 | |
20192 | 1097 SuspendibleThreadSet::join(); |
342 | 1098 |
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1099 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1100 CMTask* the_task = _cm->task(worker_id); |
342 | 1101 the_task->record_start_time(); |
1102 if (!_cm->has_aborted()) { | |
1103 do { | |
1104 double start_vtime_sec = os::elapsedVTime(); | |
1105 double start_time_sec = os::elapsedTime(); | |
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1106 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1107 |
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1108 the_task->do_marking_step(mark_step_duration_ms, |
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1109 true /* do_termination */, |
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1110 false /* is_serial*/); |
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1111 |
342 | 1112 double end_time_sec = os::elapsedTime(); |
1113 double end_vtime_sec = os::elapsedVTime(); | |
1114 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1115 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1116 _cm->clear_has_overflown(); | |
1117 | |
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1118 bool ret = _cm->do_yield_check(worker_id); |
342 | 1119 |
1120 jlong sleep_time_ms; | |
1121 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1122 sleep_time_ms = | |
1123 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
20192 | 1124 SuspendibleThreadSet::leave(); |
342 | 1125 os::sleep(Thread::current(), sleep_time_ms, false); |
20192 | 1126 SuspendibleThreadSet::join(); |
342 | 1127 } |
1128 double end_time2_sec = os::elapsedTime(); | |
1129 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1130 | |
1131 #if 0 | |
1132 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1133 "overhead %1.4lf", | |
1134 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1135 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1136 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1137 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1138 #endif | |
1139 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1140 } | |
1141 the_task->record_end_time(); | |
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1142 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1143 |
20192 | 1144 SuspendibleThreadSet::leave(); |
342 | 1145 |
1146 double end_vtime = os::elapsedVTime(); | |
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1147 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1148 } |
1149 | |
1150 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1151 ConcurrentMarkThread* cmt) : | |
1152 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1153 | |
1154 ~CMConcurrentMarkingTask() { } | |
1155 }; | |
1156 | |
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1157 // Calculates the number of active workers for a concurrent |
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1158 // phase. |
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1159 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1160 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1161 uint n_conc_workers = 0; |
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1162 if (!UseDynamicNumberOfGCThreads || |
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1163 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1164 !ForceDynamicNumberOfGCThreads)) { |
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1165 n_conc_workers = max_parallel_marking_threads(); |
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1166 } else { |
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1167 n_conc_workers = |
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1168 AdaptiveSizePolicy::calc_default_active_workers( |
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1169 max_parallel_marking_threads(), |
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1170 1, /* Minimum workers */ |
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1171 parallel_marking_threads(), |
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1172 Threads::number_of_non_daemon_threads()); |
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1173 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1174 // that scaling has already gone into "_max_parallel_marking_threads". |
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1175 } |
4711 | 1176 assert(n_conc_workers > 0, "Always need at least 1"); |
1177 return n_conc_workers; | |
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1178 } |
4711 | 1179 // If we are not running with any parallel GC threads we will not |
1180 // have spawned any marking threads either. Hence the number of | |
1181 // concurrent workers should be 0. | |
1182 return 0; | |
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1183 } |
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1184 |
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1185 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1186 // Currently, only survivors can be root regions. |
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1187 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1188 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1189 |
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1190 const uintx interval = PrefetchScanIntervalInBytes; |
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1191 HeapWord* curr = hr->bottom(); |
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1192 const HeapWord* end = hr->top(); |
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1193 while (curr < end) { |
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1194 Prefetch::read(curr, interval); |
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1195 oop obj = oop(curr); |
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1196 int size = obj->oop_iterate(&cl); |
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1197 assert(size == obj->size(), "sanity"); |
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1198 curr += size; |
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1199 } |
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1200 } |
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1201 |
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1202 class CMRootRegionScanTask : public AbstractGangTask { |
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1203 private: |
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1204 ConcurrentMark* _cm; |
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1205 |
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1206 public: |
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1207 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1208 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1209 |
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1210 void work(uint worker_id) { |
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1211 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1212 "this should only be done by a conc GC thread"); |
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1213 |
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1214 CMRootRegions* root_regions = _cm->root_regions(); |
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1215 HeapRegion* hr = root_regions->claim_next(); |
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1216 while (hr != NULL) { |
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1217 _cm->scanRootRegion(hr, worker_id); |
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1218 hr = root_regions->claim_next(); |
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1219 } |
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1220 } |
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1221 }; |
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1222 |
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1223 void ConcurrentMark::scanRootRegions() { |
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1224 // scan_in_progress() will have been set to true only if there was |
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1225 // at least one root region to scan. So, if it's false, we |
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1226 // should not attempt to do any further work. |
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1227 if (root_regions()->scan_in_progress()) { |
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1228 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1229 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1230 "Maximum number of marking threads exceeded"); |
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1231 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1232 |
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1233 CMRootRegionScanTask task(this); |
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1234 if (use_parallel_marking_threads()) { |
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1235 _parallel_workers->set_active_workers((int) active_workers); |
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1236 _parallel_workers->run_task(&task); |
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1237 } else { |
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1238 task.work(0); |
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1239 } |
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1240 |
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1241 // It's possible that has_aborted() is true here without actually |
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1242 // aborting the survivor scan earlier. This is OK as it's |
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1243 // mainly used for sanity checking. |
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1244 root_regions()->scan_finished(); |
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1245 } |
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1246 } |
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1247 |
342 | 1248 void ConcurrentMark::markFromRoots() { |
1249 // we might be tempted to assert that: | |
1250 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1251 // "inconsistent argument?"); | |
1252 // However that wouldn't be right, because it's possible that | |
1253 // a safepoint is indeed in progress as a younger generation | |
1254 // stop-the-world GC happens even as we mark in this generation. | |
1255 | |
1256 _restart_for_overflow = false; | |
3316
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1257 force_overflow_conc()->init(); |
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1258 |
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1259 // _g1h has _n_par_threads |
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1260 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1261 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1262 "Maximum number of marking threads exceeded"); |
4711 | 1263 |
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1264 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1265 |
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1266 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1267 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1268 |
1269 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1270 if (use_parallel_marking_threads()) { |
4711 | 1271 _parallel_workers->set_active_workers((int)active_workers); |
1272 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1273 // and the decisions on that MT processing is made elsewhere. | |
1274 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1275 _parallel_workers->run_task(&markingTask); |
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1276 } else { |
342 | 1277 markingTask.work(0); |
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1278 } |
342 | 1279 print_stats(); |
1280 } | |
1281 | |
1282 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1283 // world is stopped at this checkpoint | |
1284 assert(SafepointSynchronize::is_at_safepoint(), | |
1285 "world should be stopped"); | |
3979
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1286 |
342 | 1287 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1288 | |
1289 // If a full collection has happened, we shouldn't do this. | |
1290 if (has_aborted()) { | |
1291 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1292 return; | |
1293 } | |
1294 | |
2125
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1295 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1296 |
845
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1297 if (VerifyDuringGC) { |
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1298 HandleMark hm; // handle scope |
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1299 Universe::heap()->prepare_for_verify(); |
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1300 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1301 " VerifyDuringGC:(before)"); |
845
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1302 } |
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1303 |
342 | 1304 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1305 g1p->record_concurrent_mark_remark_start(); | |
1306 | |
1307 double start = os::elapsedTime(); | |
1308 | |
1309 checkpointRootsFinalWork(); | |
1310 | |
1311 double mark_work_end = os::elapsedTime(); | |
1312 | |
1313 weakRefsWork(clear_all_soft_refs); | |
1314 | |
1315 if (has_overflown()) { | |
1316 // Oops. We overflowed. Restart concurrent marking. | |
1317 _restart_for_overflow = true; | |
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1318 if (G1TraceMarkStackOverflow) { |
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1319 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1320 } |
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1321 |
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1322 // Verify the heap w.r.t. the previous marking bitmap. |
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1323 if (VerifyDuringGC) { |
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1324 HandleMark hm; // handle scope |
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1325 Universe::heap()->prepare_for_verify(); |
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1326 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1327 " VerifyDuringGC:(overflow)"); |
8789
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1328 } |
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1329 |
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1330 // Clear the marking state because we will be restarting |
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1331 // marking due to overflowing the global mark stack. |
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1332 reset_marking_state(); |
342 | 1333 } else { |
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1334 // Aggregate the per-task counting data that we have accumulated |
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1335 // while marking. |
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1336 aggregate_count_data(); |
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1337 |
2149 | 1338 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1339 // We're done with marking. |
1317
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1340 // This is the end of the marking cycle, we're expected all |
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1341 // threads to have SATB queues with active set to true. |
2149 | 1342 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1343 true /* expected_active */); | |
811 | 1344 |
1345 if (VerifyDuringGC) { | |
845
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1346 HandleMark hm; // handle scope |
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1347 Universe::heap()->prepare_for_verify(); |
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1348 Universe::verify(VerifyOption_G1UseNextMarking, |
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1349 " VerifyDuringGC:(after)"); |
811 | 1350 } |
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1351 assert(!restart_for_overflow(), "sanity"); |
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1352 // Completely reset the marking state since marking completed |
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1353 set_non_marking_state(); |
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1354 } |
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1355 |
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1356 // Expand the marking stack, if we have to and if we can. |
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1357 if (_markStack.should_expand()) { |
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1358 _markStack.expand(); |
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1359 } |
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1360 |
342 | 1361 // Statistics |
1362 double now = os::elapsedTime(); | |
1363 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1364 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1365 _remark_times.add((now - start) * 1000.0); | |
1366 | |
1367 g1p->record_concurrent_mark_remark_end(); | |
10405 | 1368 |
1369 G1CMIsAliveClosure is_alive(g1h); | |
1370 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
342 | 1371 } |
1372 | |
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1373 // Base class of the closures that finalize and verify the |
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1374 // liveness counting data. |
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1375 class CMCountDataClosureBase: public HeapRegionClosure { |
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1376 protected: |
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1377 G1CollectedHeap* _g1h; |
342 | 1378 ConcurrentMark* _cm; |
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1379 CardTableModRefBS* _ct_bs; |
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1380 |
342 | 1381 BitMap* _region_bm; |
1382 BitMap* _card_bm; | |
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1383 |
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1384 // Takes a region that's not empty (i.e., it has at least one |
829 | 1385 // live object in it and sets its corresponding bit on the region |
1386 // bitmap to 1. If the region is "starts humongous" it will also set | |
1387 // to 1 the bits on the region bitmap that correspond to its | |
1388 // associated "continues humongous" regions. | |
1389 void set_bit_for_region(HeapRegion* hr) { | |
1390 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1391 | |
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1392 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1393 if (!hr->startsHumongous()) { |
1394 // Normal (non-humongous) case: just set the bit. | |
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1395 _region_bm->par_at_put(index, true); |
829 | 1396 } else { |
1397 // Starts humongous case: calculate how many regions are part of | |
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1398 // this humongous region and then set the bit range. |
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1399 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1400 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1401 } |
1402 } | |
1403 | |
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1404 public: |
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1405 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1406 BitMap* region_bm, BitMap* card_bm): |
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1407 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1408 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1409 _region_bm(region_bm), _card_bm(card_bm) { } |
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1410 }; |
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1411 |
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1412 // Closure that calculates the # live objects per region. Used |
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1413 // for verification purposes during the cleanup pause. |
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1414 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1415 CMBitMapRO* _bm; |
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1416 size_t _region_marked_bytes; |
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1417 |
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1418 public: |
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1419 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1420 BitMap* region_bm, BitMap* card_bm) : |
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1421 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1422 _bm(bm), _region_marked_bytes(0) { } |
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1423 |
342 | 1424 bool doHeapRegion(HeapRegion* hr) { |
1425 | |
639 | 1426 if (hr->continuesHumongous()) { |
829 | 1427 // We will ignore these here and process them when their |
1428 // associated "starts humongous" region is processed (see | |
1429 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1430 // associated "starts humongous" region to have their bit set to | |
1431 // 1 since, due to the region chunking in the parallel region | |
1432 // iteration, a "continues humongous" region might be visited | |
1433 // before its associated "starts humongous". | |
639 | 1434 return false; |
1435 } | |
342 | 1436 |
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1437 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1438 HeapWord* start = hr->bottom(); |
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1439 |
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1440 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1441 err_msg("Preconditions not met - " |
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1442 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1443 p2i(start), p2i(ntams), p2i(hr->end()))); |
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1444 |
342 | 1445 // Find the first marked object at or after "start". |
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1446 start = _bm->getNextMarkedWordAddress(start, ntams); |
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|
1447 |
342 | 1448 size_t marked_bytes = 0; |
1449 | |
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1450 while (start < ntams) { |
342 | 1451 oop obj = oop(start); |
1452 int obj_sz = obj->size(); | |
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1453 HeapWord* obj_end = start + obj_sz; |
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1454 |
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1455 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1456 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1457 |
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1458 // Note: if we're looking at the last region in heap - obj_end |
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1459 // could be actually just beyond the end of the heap; end_idx |
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1460 // will then correspond to a (non-existent) card that is also |
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1461 // just beyond the heap. |
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1462 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1463 // end of object is not card aligned - increment to cover |
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1464 // all the cards spanned by the object |
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1465 end_idx += 1; |
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1466 } |
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1467 |
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1468 // Set the bits in the card BM for the cards spanned by this object. |
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1469 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1470 |
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1471 // Add the size of this object to the number of marked bytes. |
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1472 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1473 |
342 | 1474 // Find the next marked object after this one. |
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1475 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1476 } |
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1477 |
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1478 // Mark the allocated-since-marking portion... |
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1479 HeapWord* top = hr->top(); |
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1480 if (ntams < top) { |
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1481 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1482 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1483 |
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1484 // Note: if we're looking at the last region in heap - top |
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1485 // could be actually just beyond the end of the heap; end_idx |
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1486 // will then correspond to a (non-existent) card that is also |
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1487 // just beyond the heap. |
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1488 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1489 // end of object is not card aligned - increment to cover |
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1490 // all the cards spanned by the object |
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1491 end_idx += 1; |
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1492 } |
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1493 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1494 |
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1495 // This definitely means the region has live objects. |
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1496 set_bit_for_region(hr); |
342 | 1497 } |
1498 | |
1499 // Update the live region bitmap. | |
1500 if (marked_bytes > 0) { | |
829 | 1501 set_bit_for_region(hr); |
342 | 1502 } |
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1503 |
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1504 // Set the marked bytes for the current region so that |
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1505 // it can be queried by a calling verificiation routine |
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1506 _region_marked_bytes = marked_bytes; |
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1507 |
342 | 1508 return false; |
1509 } | |
1510 | |
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1511 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1512 }; |
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1513 |
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1514 // Heap region closure used for verifying the counting data |
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1515 // that was accumulated concurrently and aggregated during |
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1516 // the remark pause. This closure is applied to the heap |
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1517 // regions during the STW cleanup pause. |
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1518 |
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1519 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1520 G1CollectedHeap* _g1h; |
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1521 ConcurrentMark* _cm; |
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1522 CalcLiveObjectsClosure _calc_cl; |
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1523 BitMap* _region_bm; // Region BM to be verified |
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1524 BitMap* _card_bm; // Card BM to be verified |
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1525 bool _verbose; // verbose output? |
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1526 |
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1527 BitMap* _exp_region_bm; // Expected Region BM values |
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1528 BitMap* _exp_card_bm; // Expected card BM values |
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1529 |
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1530 int _failures; |
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1531 |
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1532 public: |
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1533 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1534 BitMap* region_bm, |
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1535 BitMap* card_bm, |
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1536 BitMap* exp_region_bm, |
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1537 BitMap* exp_card_bm, |
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1538 bool verbose) : |
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1539 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1540 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1541 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1542 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1543 _failures(0) { } |
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1544 |
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1545 int failures() const { return _failures; } |
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1546 |
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1547 bool doHeapRegion(HeapRegion* hr) { |
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1548 if (hr->continuesHumongous()) { |
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1549 // We will ignore these here and process them when their |
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1550 // associated "starts humongous" region is processed (see |
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1551 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1552 // associated "starts humongous" region to have their bit set to |
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1553 // 1 since, due to the region chunking in the parallel region |
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1554 // iteration, a "continues humongous" region might be visited |
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1555 // before its associated "starts humongous". |
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|
1556 return false; |
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|
1557 } |
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1558 |
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1559 int failures = 0; |
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|
1560 |
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1561 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1562 // this region and set the corresponding bits in the expected region |
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1563 // and card bitmaps. |
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|
1564 bool res = _calc_cl.doHeapRegion(hr); |
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1565 assert(res == false, "should be continuing"); |
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|
1566 |
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1567 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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|
1568 Mutex::_no_safepoint_check_flag); |
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|
1569 |
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|
1570 // Verify the marked bytes for this region. |
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|
1571 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1572 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1573 |
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|
1574 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1575 // we have missed accounting some objects during the actual marking. |
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|
1576 if (exp_marked_bytes > act_marked_bytes) { |
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|
1577 if (_verbose) { |
6010
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|
1578 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
4836
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1579 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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|
1580 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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|
1581 } |
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|
1582 failures += 1; |
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|
1583 } |
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|
1584 |
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1585 // Verify the bit, for this region, in the actual and expected |
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1586 // (which was just calculated) region bit maps. |
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1587 // We're not OK if the bit in the calculated expected region |
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1588 // bitmap is set and the bit in the actual region bitmap is not. |
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1589 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
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1590 |
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1591 bool expected = _exp_region_bm->at(index); |
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1592 bool actual = _region_bm->at(index); |
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1593 if (expected && !actual) { |
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1594 if (_verbose) { |
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1595 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1596 "expected: %s, actual: %s", |
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1597 hr->hrs_index(), |
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1598 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1599 } |
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1600 failures += 1; |
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1601 } |
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1602 |
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1603 // Verify that the card bit maps for the cards spanned by the current |
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1604 // region match. We have an error if we have a set bit in the expected |
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1605 // bit map and the corresponding bit in the actual bitmap is not set. |
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1606 |
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1607 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1608 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1609 |
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1610 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1611 expected = _exp_card_bm->at(i); |
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1612 actual = _card_bm->at(i); |
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|
1613 |
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1614 if (expected && !actual) { |
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1615 if (_verbose) { |
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1616 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1617 "expected: %s, actual: %s", |
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1618 hr->hrs_index(), i, |
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1619 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1620 } |
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|
1621 failures += 1; |
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|
1622 } |
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|
1623 } |
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|
1624 |
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1625 if (failures > 0 && _verbose) { |
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1626 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1627 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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|
1628 HR_FORMAT_PARAMS(hr), p2i(hr->next_top_at_mark_start()), |
4836
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1629 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1630 } |
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|
1631 |
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1632 _failures += failures; |
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|
1633 |
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1634 // We could stop iteration over the heap when we |
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1635 // find the first violating region by returning true. |
4836
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1636 return false; |
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1637 } |
342 | 1638 }; |
1639 | |
4836
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1640 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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|
1641 protected: |
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|
1642 G1CollectedHeap* _g1h; |
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|
1643 ConcurrentMark* _cm; |
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1644 BitMap* _actual_region_bm; |
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1645 BitMap* _actual_card_bm; |
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|
1646 |
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|
1647 uint _n_workers; |
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|
1648 |
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|
1649 BitMap* _expected_region_bm; |
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|
1650 BitMap* _expected_card_bm; |
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|
1651 |
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|
1652 int _failures; |
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|
1653 bool _verbose; |
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|
1654 |
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|
1655 public: |
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|
1656 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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|
1657 BitMap* region_bm, BitMap* card_bm, |
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|
1658 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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|
1659 : AbstractGangTask("G1 verify final counting"), |
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|
1660 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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|
1661 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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|
1662 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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|
1663 _failures(0), _verbose(false), |
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|
1664 _n_workers(0) { |
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|
1665 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1666 |
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|
1667 // Use the value already set as the number of active threads |
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|
1668 // in the call to run_task(). |
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|
1669 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1670 assert( _g1h->workers()->active_workers() > 0, |
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|
1671 "Should have been previously set"); |
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|
1672 _n_workers = _g1h->workers()->active_workers(); |
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|
1673 } else { |
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|
1674 _n_workers = 1; |
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|
1675 } |
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|
1676 |
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|
1677 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1678 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1679 |
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|
1680 _verbose = _cm->verbose_medium(); |
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|
1681 } |
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|
1682 |
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|
1683 void work(uint worker_id) { |
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|
1684 assert(worker_id < _n_workers, "invariant"); |
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|
1685 |
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diff
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|
1686 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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|
1687 _actual_region_bm, _actual_card_bm, |
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|
1688 _expected_region_bm, |
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|
1689 _expected_card_bm, |
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|
1690 _verbose); |
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|
1691 |
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|
1692 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1693 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1694 worker_id, |
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|
1695 _n_workers, |
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|
1696 HeapRegion::VerifyCountClaimValue); |
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|
1697 } else { |
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|
1698 _g1h->heap_region_iterate(&verify_cl); |
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|
1699 } |
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|
1700 |
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|
1701 Atomic::add(verify_cl.failures(), &_failures); |
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|
1702 } |
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|
1703 |
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|
1704 int failures() const { return _failures; } |
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|
1705 }; |
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|
1706 |
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|
1707 // Closure that finalizes the liveness counting data. |
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|
1708 // Used during the cleanup pause. |
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|
1709 // Sets the bits corresponding to the interval [NTAMS, top] |
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|
1710 // (which contains the implicitly live objects) in the |
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1711 // card liveness bitmap. Also sets the bit for each region, |
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1712 // containing live data, in the region liveness bitmap. |
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1713 |
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1714 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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1715 public: |
6812
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1716 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
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1717 BitMap* region_bm, |
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1718 BitMap* card_bm) : |
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1719 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
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1720 |
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1721 bool doHeapRegion(HeapRegion* hr) { |
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1722 |
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1723 if (hr->continuesHumongous()) { |
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1724 // We will ignore these here and process them when their |
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1725 // associated "starts humongous" region is processed (see |
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1726 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1727 // associated "starts humongous" region to have their bit set to |
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1728 // 1 since, due to the region chunking in the parallel region |
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1729 // iteration, a "continues humongous" region might be visited |
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1730 // before its associated "starts humongous". |
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1731 return false; |
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1732 } |
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1733 |
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1734 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1735 HeapWord* top = hr->top(); |
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1736 |
6027
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1737 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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1738 |
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1739 // Mark the allocated-since-marking portion... |
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1740 if (ntams < top) { |
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1741 // This definitely means the region has live objects. |
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1742 set_bit_for_region(hr); |
6812
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1743 |
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1744 // Now set the bits in the card bitmap for [ntams, top) |
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1745 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1746 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1747 |
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1748 // Note: if we're looking at the last region in heap - top |
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1749 // could be actually just beyond the end of the heap; end_idx |
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1750 // will then correspond to a (non-existent) card that is also |
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|
1751 // just beyond the heap. |
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|
1752 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1753 // end of object is not card aligned - increment to cover |
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|
1754 // all the cards spanned by the object |
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|
1755 end_idx += 1; |
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|
1756 } |
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|
1757 |
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1758 assert(end_idx <= _card_bm->size(), |
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|
1759 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1760 end_idx, _card_bm->size())); |
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|
1761 assert(start_idx < _card_bm->size(), |
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|
1762 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1763 start_idx, _card_bm->size())); |
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|
1764 |
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1765 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
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1766 } |
4836
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1767 |
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1768 // Set the bit for the region if it contains live data |
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1769 if (hr->next_marked_bytes() > 0) { |
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1770 set_bit_for_region(hr); |
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1771 } |
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|
1772 |
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|
1773 return false; |
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|
1774 } |
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|
1775 }; |
342 | 1776 |
1777 class G1ParFinalCountTask: public AbstractGangTask { | |
1778 protected: | |
1779 G1CollectedHeap* _g1h; | |
4836
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1780 ConcurrentMark* _cm; |
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1781 BitMap* _actual_region_bm; |
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1782 BitMap* _actual_card_bm; |
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1783 |
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1784 uint _n_workers; |
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1785 |
342 | 1786 public: |
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1787 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1788 : AbstractGangTask("G1 final counting"), |
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1789 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1790 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1791 _n_workers(0) { |
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|
1792 // Use the value already set as the number of active threads |
6011 | 1793 // in the call to run_task(). |
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|
1794 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1795 assert( _g1h->workers()->active_workers() > 0, |
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|
1796 "Should have been previously set"); |
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|
1797 _n_workers = _g1h->workers()->active_workers(); |
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1798 } else { |
342 | 1799 _n_workers = 1; |
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1800 } |
342 | 1801 } |
1802 | |
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1803 void work(uint worker_id) { |
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1804 assert(worker_id < _n_workers, "invariant"); |
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1805 |
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1806 FinalCountDataUpdateClosure final_update_cl(_g1h, |
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1807 _actual_region_bm, |
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1808 _actual_card_bm); |
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|
1809 |
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1810 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1811 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1812 worker_id, |
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1813 _n_workers, |
355 | 1814 HeapRegion::FinalCountClaimValue); |
342 | 1815 } else { |
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1816 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1817 } |
1818 } | |
1819 }; | |
1820 | |
1821 class G1ParNoteEndTask; | |
1822 | |
1823 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1824 G1CollectedHeap* _g1; | |
1825 size_t _max_live_bytes; | |
6010
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1826 uint _regions_claimed; |
342 | 1827 size_t _freed_bytes; |
2173 | 1828 FreeRegionList* _local_cleanup_list; |
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1829 HeapRegionSetCount _old_regions_removed; |
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1830 HeapRegionSetCount _humongous_regions_removed; |
2173 | 1831 HRRSCleanupTask* _hrrs_cleanup_task; |
342 | 1832 double _claimed_region_time; |
1833 double _max_region_time; | |
1834 | |
1835 public: | |
1836 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1837 FreeRegionList* local_cleanup_list, |
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1838 HRRSCleanupTask* hrrs_cleanup_task) : |
17844
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1839 _g1(g1), |
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1840 _max_live_bytes(0), _regions_claimed(0), |
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1841 _freed_bytes(0), |
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1842 _claimed_region_time(0.0), _max_region_time(0.0), |
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1843 _local_cleanup_list(local_cleanup_list), |
17736
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1844 _old_regions_removed(), |
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1845 _humongous_regions_removed(), |
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1846 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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|
1847 |
342 | 1848 size_t freed_bytes() { return _freed_bytes; } |
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1849 const HeapRegionSetCount& old_regions_removed() { return _old_regions_removed; } |
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1850 const HeapRegionSetCount& humongous_regions_removed() { return _humongous_regions_removed; } |
342 | 1851 |
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1852 bool doHeapRegion(HeapRegion *hr) { |
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1853 if (hr->continuesHumongous()) { |
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1854 return false; |
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1855 } |
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1856 // We use a claim value of zero here because all regions |
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1857 // were claimed with value 1 in the FinalCount task. |
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|
1858 _g1->reset_gc_time_stamps(hr); |
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1859 double start = os::elapsedTime(); |
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1860 _regions_claimed++; |
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1861 hr->note_end_of_marking(); |
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1862 _max_live_bytes += hr->max_live_bytes(); |
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1863 |
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1864 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { |
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1865 _freed_bytes += hr->used(); |
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1866 hr->set_containing_set(NULL); |
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1867 if (hr->isHumongous()) { |
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1868 assert(hr->startsHumongous(), "we should only see starts humongous"); |
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1869 _humongous_regions_removed.increment(1u, hr->capacity()); |
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1870 _g1->free_humongous_region(hr, _local_cleanup_list, true); |
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1871 } else { |
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1872 _old_regions_removed.increment(1u, hr->capacity()); |
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1873 _g1->free_region(hr, _local_cleanup_list, true); |
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1874 } |
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1875 } else { |
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1876 hr->rem_set()->do_cleanup_work(_hrrs_cleanup_task); |
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1877 } |
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1878 |
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1879 double region_time = (os::elapsedTime() - start); |
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1880 _claimed_region_time += region_time; |
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1881 if (region_time > _max_region_time) { |
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1882 _max_region_time = region_time; |
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1883 } |
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1884 return false; |
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1885 } |
342 | 1886 |
1887 size_t max_live_bytes() { return _max_live_bytes; } | |
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1888 uint regions_claimed() { return _regions_claimed; } |
342 | 1889 double claimed_region_time_sec() { return _claimed_region_time; } |
1890 double max_region_time_sec() { return _max_region_time; } | |
1891 }; | |
1892 | |
1893 class G1ParNoteEndTask: public AbstractGangTask { | |
1894 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1895 |
342 | 1896 protected: |
1897 G1CollectedHeap* _g1h; | |
1898 size_t _max_live_bytes; | |
1899 size_t _freed_bytes; | |
2152 | 1900 FreeRegionList* _cleanup_list; |
1901 | |
342 | 1902 public: |
1903 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1904 FreeRegionList* cleanup_list) : |
342 | 1905 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1906 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1907 |
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1908 void work(uint worker_id) { |
342 | 1909 double start = os::elapsedTime(); |
2173 | 1910 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1911 HRRSCleanupTask hrrs_cleanup_task; | |
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1912 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, &local_cleanup_list, |
2173 | 1913 &hrrs_cleanup_task); |
1833
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1914 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1915 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1916 _g1h->workers()->active_workers(), |
355 | 1917 HeapRegion::NoteEndClaimValue); |
342 | 1918 } else { |
1919 _g1h->heap_region_iterate(&g1_note_end); | |
1920 } | |
1921 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1922 | |
2152 | 1923 // Now update the lists |
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1924 _g1h->remove_from_old_sets(g1_note_end.old_regions_removed(), g1_note_end.humongous_regions_removed()); |
342 | 1925 { |
1926 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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1927 _g1h->decrement_summary_bytes(g1_note_end.freed_bytes()); |
342 | 1928 _max_live_bytes += g1_note_end.max_live_bytes(); |
1929 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1930 |
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1931 // If we iterate over the global cleanup list at the end of |
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1932 // cleanup to do this printing we will not guarantee to only |
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1933 // generate output for the newly-reclaimed regions (the list |
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1934 // might not be empty at the beginning of cleanup; we might |
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1935 // still be working on its previous contents). So we do the |
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1936 // printing here, before we append the new regions to the global |
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1937 // cleanup list. |
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1938 |
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1939 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1940 if (hr_printer->is_active()) { |
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1941 FreeRegionListIterator iter(&local_cleanup_list); |
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1942 while (iter.more_available()) { |
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1943 HeapRegion* hr = iter.get_next(); |
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1944 hr_printer->cleanup(hr); |
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1945 } |
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1946 } |
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1947 |
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1948 _cleanup_list->add_ordered(&local_cleanup_list); |
2173 | 1949 assert(local_cleanup_list.is_empty(), "post-condition"); |
1950 | |
1951 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1952 } |
1953 } | |
1954 size_t max_live_bytes() { return _max_live_bytes; } | |
1955 size_t freed_bytes() { return _freed_bytes; } | |
1956 }; | |
1957 | |
1958 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1959 protected: | |
1960 G1RemSet* _g1rs; | |
1961 BitMap* _region_bm; | |
1962 BitMap* _card_bm; | |
1963 public: | |
1964 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1965 BitMap* region_bm, BitMap* card_bm) : | |
1966 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1967 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1968 |
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1969 void work(uint worker_id) { |
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1970 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1971 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1972 HeapRegion::ScrubRemSetClaimValue); |
342 | 1973 } else { |
1974 _g1rs->scrub(_region_bm, _card_bm); | |
1975 } | |
1976 } | |
1977 | |
1978 }; | |
1979 | |
1980 void ConcurrentMark::cleanup() { | |
1981 // world is stopped at this checkpoint | |
1982 assert(SafepointSynchronize::is_at_safepoint(), | |
1983 "world should be stopped"); | |
1984 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1985 | |
1986 // If a full collection has happened, we shouldn't do this. | |
1987 if (has_aborted()) { | |
1988 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1989 return; | |
1990 } | |
1991 | |
2152 | 1992 g1h->verify_region_sets_optional(); |
1993 | |
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1994 if (VerifyDuringGC) { |
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1995 HandleMark hm; // handle scope |
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1996 Universe::heap()->prepare_for_verify(); |
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1997 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1998 " VerifyDuringGC:(before)"); |
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1999 } |
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2000 |
342 | 2001 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
2002 g1p->record_concurrent_mark_cleanup_start(); | |
2003 | |
2004 double start = os::elapsedTime(); | |
2005 | |
2173 | 2006 HeapRegionRemSet::reset_for_cleanup_tasks(); |
2007 | |
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2008 uint n_workers; |
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2009 |
342 | 2010 // Do counting once more with the world stopped for good measure. |
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2011 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2012 |
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2013 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2014 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 2015 "sanity check"); |
2016 | |
4711 | 2017 g1h->set_par_threads(); |
2018 n_workers = g1h->n_par_threads(); | |
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2019 assert(g1h->n_par_threads() == n_workers, |
4711 | 2020 "Should not have been reset"); |
342 | 2021 g1h->workers()->run_task(&g1_par_count_task); |
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2022 // Done with the parallel phase so reset to 0. |
342 | 2023 g1h->set_par_threads(0); |
355 | 2024 |
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2025 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2026 "sanity check"); |
342 | 2027 } else { |
4711 | 2028 n_workers = 1; |
342 | 2029 g1_par_count_task.work(0); |
2030 } | |
2031 | |
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2032 if (VerifyDuringGC) { |
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2033 // Verify that the counting data accumulated during marking matches |
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2034 // that calculated by walking the marking bitmap. |
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2035 |
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2036 // Bitmaps to hold expected values |
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2037 BitMap expected_region_bm(_region_bm.size(), false); |
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2038 BitMap expected_card_bm(_card_bm.size(), false); |
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2039 |
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2040 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2041 &_region_bm, |
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2042 &_card_bm, |
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2043 &expected_region_bm, |
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2044 &expected_card_bm); |
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2045 |
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2046 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2047 g1h->set_par_threads((int)n_workers); |
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2048 g1h->workers()->run_task(&g1_par_verify_task); |
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2049 // Done with the parallel phase so reset to 0. |
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2050 g1h->set_par_threads(0); |
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2051 |
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2052 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2053 "sanity check"); |
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2054 } else { |
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2055 g1_par_verify_task.work(0); |
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2056 } |
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2057 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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2058 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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|
2059 } |
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|
2060 |
342 | 2061 size_t start_used_bytes = g1h->used(); |
2062 g1h->set_marking_complete(); | |
2063 | |
2064 double count_end = os::elapsedTime(); | |
2065 double this_final_counting_time = (count_end - start); | |
2066 _total_counting_time += this_final_counting_time; | |
2067 | |
2435
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|
2068 if (G1PrintRegionLivenessInfo) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2069 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2070 _g1h->heap_region_iterate(&cl); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2071 } |
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|
2072 |
342 | 2073 // Install newly created mark bitMap as "prev". |
2074 swapMarkBitMaps(); | |
2075 | |
2076 g1h->reset_gc_time_stamp(); | |
2077 | |
2078 // Note end of marking in all heap regions. | |
2152 | 2079 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
1833
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|
2080 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4095
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|
2081 g1h->set_par_threads((int)n_workers); |
342 | 2082 g1h->workers()->run_task(&g1_par_note_end_task); |
2083 g1h->set_par_threads(0); | |
355 | 2084 |
2085 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2086 "sanity check"); | |
342 | 2087 } else { |
2088 g1_par_note_end_task.work(0); | |
2089 } | |
6254
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2090 g1h->check_gc_time_stamps(); |
2152 | 2091 |
2092 if (!cleanup_list_is_empty()) { | |
2093 // The cleanup list is not empty, so we'll have to process it | |
2094 // concurrently. Notify anyone else that might be wanting free | |
2095 // regions that there will be more free regions coming soon. | |
2096 g1h->set_free_regions_coming(); | |
2097 } | |
342 | 2098 |
2099 // call below, since it affects the metric by which we sort the heap | |
2100 // regions. | |
2101 if (G1ScrubRemSets) { | |
2102 double rs_scrub_start = os::elapsedTime(); | |
2103 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
1833
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|
2104 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
2105 g1h->set_par_threads((int)n_workers); |
342 | 2106 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2107 g1h->set_par_threads(0); | |
355 | 2108 |
2109 assert(g1h->check_heap_region_claim_values( | |
2110 HeapRegion::ScrubRemSetClaimValue), | |
2111 "sanity check"); | |
342 | 2112 } else { |
2113 g1_par_scrub_rs_task.work(0); | |
2114 } | |
2115 | |
2116 double rs_scrub_end = os::elapsedTime(); | |
2117 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2118 _total_rs_scrub_time += this_rs_scrub_time; | |
2119 } | |
2120 | |
2121 // this will also free any regions totally full of garbage objects, | |
2122 // and sort the regions. | |
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|
2123 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2124 |
2125 // Statistics. | |
2126 double end = os::elapsedTime(); | |
2127 _cleanup_times.add((end - start) * 1000.0); | |
2128 | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
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|
2129 if (G1Log::fine()) { |
342 | 2130 g1h->print_size_transition(gclog_or_tty, |
2131 start_used_bytes, | |
2132 g1h->used(), | |
2133 g1h->capacity()); | |
2134 } | |
2135 | |
3979
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|
2136 // Clean up will have freed any regions completely full of garbage. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2137 // Update the soft reference policy with the new heap occupancy. |
4dfb2df418f2
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|
2138 Universe::update_heap_info_at_gc(); |
4dfb2df418f2
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|
2139 |
342 | 2140 // We need to make this be a "collection" so any collection pause that |
2141 // races with it goes around and waits for completeCleanup to finish. | |
2142 g1h->increment_total_collections(); | |
2143 | |
4830
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7097586: G1: improve the per-space output when using jmap -heap
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|
2144 // We reclaimed old regions so we should calculate the sizes to make |
0b3d1ec6eaee
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|
2145 // sure we update the old gen/space data. |
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|
2146 g1h->g1mm()->update_sizes(); |
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7097586: G1: improve the per-space output when using jmap -heap
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|
2147 |
751 | 2148 if (VerifyDuringGC) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
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|
2149 HandleMark hm; // handle scope |
df6caf649ff7
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|
2150 Universe::heap()->prepare_for_verify(); |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
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|
2151 Universe::verify(VerifyOption_G1UsePrevMarking, |
b06ac540229e
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|
2152 " VerifyDuringGC:(after)"); |
342 | 2153 } |
2152 | 2154 |
2155 g1h->verify_region_sets_optional(); | |
10405 | 2156 g1h->trace_heap_after_concurrent_cycle(); |
342 | 2157 } |
2158 | |
2159 void ConcurrentMark::completeCleanup() { | |
2160 if (has_aborted()) return; | |
2161 | |
2152 | 2162 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2163 | |
17841
14bd75c9dbfa
8039089: List verification enabled in product builds
jwilhelm
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diff
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|
2164 _cleanup_list.verify_optional(); |
2361 | 2165 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2166 |
2167 if (G1ConcRegionFreeingVerbose) { | |
2168 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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|
2169 "cleanup list has %u entries", |
2152 | 2170 _cleanup_list.length()); |
2171 } | |
2172 | |
2173 // Noone else should be accessing the _cleanup_list at this point, | |
2174 // so it's not necessary to take any locks | |
2175 while (!_cleanup_list.is_empty()) { | |
2176 HeapRegion* hr = _cleanup_list.remove_head(); | |
17773
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|
2177 assert(hr != NULL, "Got NULL from a non-empty list"); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
2178 hr->par_clear(); |
17773
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|
2179 tmp_free_list.add_ordered(hr); |
2152 | 2180 |
2181 // Instead of adding one region at a time to the secondary_free_list, | |
2182 // we accumulate them in the local list and move them a few at a | |
2183 // time. This also cuts down on the number of notify_all() calls | |
2184 // we do during this process. We'll also append the local list when | |
2185 // _cleanup_list is empty (which means we just removed the last | |
2186 // region from the _cleanup_list). | |
2361 | 2187 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2188 _cleanup_list.is_empty()) { |
2189 if (G1ConcRegionFreeingVerbose) { | |
2190 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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7157073: G1: type change size_t -> uint for region counts / indexes
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diff
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|
2191 "appending %u entries to the secondary_free_list, " |
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diff
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|
2192 "cleanup list still has %u entries", |
2361 | 2193 tmp_free_list.length(), |
2152 | 2194 _cleanup_list.length()); |
342 | 2195 } |
2152 | 2196 |
2197 { | |
2198 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
17773
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|
2199 g1h->secondary_free_list_add(&tmp_free_list); |
2152 | 2200 SecondaryFreeList_lock->notify_all(); |
2201 } | |
2202 | |
2203 if (G1StressConcRegionFreeing) { | |
2204 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2205 os::sleep(Thread::current(), (jlong) 1, false); | |
2206 } | |
2207 } | |
342 | 2208 } |
2209 } | |
2361 | 2210 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2211 } |
2212 | |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2213 // Supporting Object and Oop closures for reference discovery |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2214 // and processing in during marking |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2215 |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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1974
diff
changeset
|
2216 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2217 HeapWord* addr = (HeapWord*)obj; |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2218 return addr != NULL && |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2219 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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diff
changeset
|
2220 } |
342 | 2221 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2222 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
f90b9bceb8e5
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johnc
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8008
diff
changeset
|
2223 // Uses the CMTask associated with a worker thread (for serial reference |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2224 // processing the CMTask for worker 0 is used) to preserve (mark) and |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2225 // trace referent objects. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2226 // |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2227 // 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
|
2228 // threads operating on the global mark stack. This reduces the risk |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2229 // of overflowing the stack - which we would rather avoid at this late |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2230 // state. Also using the tasks' local queues removes the potential |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2231 // 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
|
2232 // operating on the global stack. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2233 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2234 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2235 ConcurrentMark* _cm; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
2236 CMTask* _task; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2237 int _ref_counter_limit; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2238 int _ref_counter; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
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|
2239 bool _is_serial; |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2240 public: |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
changeset
|
2241 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
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|
2242 _cm(cm), _task(task), _is_serial(is_serial), |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
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8744
diff
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|
2243 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
234761c55641
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2152
diff
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|
2244 assert(_ref_counter_limit > 0, "sanity"); |
8787
fa08949fe0cb
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|
2245 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
234761c55641
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2152
diff
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|
2246 _ref_counter = _ref_counter_limit; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2247 } |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2248 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2249 virtual void do_oop(narrowOop* 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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|
2250 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
changeset
|
2251 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2252 template <class T> void do_oop_work(T* p) { |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
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|
2253 if (!_cm->has_overflown()) { |
234761c55641
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johnc
parents:
2152
diff
changeset
|
2254 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
2255 if (_cm->verbose_high()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2256 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2257 "*"PTR_FORMAT" = "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2258 _task->worker_id(), p2i(p), p2i((void*) obj)); |
3776
23d434c6290d
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3772
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|
2259 } |
2174
234761c55641
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2152
diff
changeset
|
2260 |
234761c55641
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2152
diff
changeset
|
2261 _task->deal_with_reference(obj); |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2262 _ref_counter--; |
234761c55641
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2152
diff
changeset
|
2263 |
234761c55641
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2152
diff
changeset
|
2264 if (_ref_counter == 0) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2265 // We have dealt with _ref_counter_limit references, pushing them |
f90b9bceb8e5
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johnc
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8008
diff
changeset
|
2266 // and objects reachable from them on to the local stack (and |
f90b9bceb8e5
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8008
diff
changeset
|
2267 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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johnc
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8008
diff
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|
2268 // process these entries. |
f90b9bceb8e5
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8008
diff
changeset
|
2269 // |
f90b9bceb8e5
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8008
diff
changeset
|
2270 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
f90b9bceb8e5
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8008
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|
2271 // there's nothing more to do (i.e. we're done with the entries that |
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2272 // were pushed as a result of the CMTask::deal_with_reference() calls |
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2273 // above) or we overflow. |
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2274 // |
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2275 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2276 // flag while there may still be some work to do. (See the comment at |
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2277 // the beginning of CMTask::do_marking_step() for those conditions - |
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2278 // one of which is reaching the specified time target.) It is only |
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2279 // when CMTask::do_marking_step() returns without setting the |
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2280 // has_aborted() flag that the marking step has completed. |
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2281 do { |
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2282 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2283 _task->do_marking_step(mark_step_duration_ms, |
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2284 false /* do_termination */, |
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2285 _is_serial); |
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2286 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2287 _ref_counter = _ref_counter_limit; |
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2288 } |
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2289 } else { |
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2290 if (_cm->verbose_high()) { |
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2291 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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2292 } |
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2293 } |
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2294 } |
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2295 }; |
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2296 |
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2297 // 'Drain' oop closure used by both serial and parallel reference processing. |
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2298 // Uses the CMTask associated with a given worker thread (for serial |
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2299 // reference processing the CMtask for worker 0 is used). Calls the |
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2300 // do_marking_step routine, with an unbelievably large timeout value, |
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2301 // to drain the marking data structures of the remaining entries |
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2302 // added by the 'keep alive' oop closure above. |
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2303 |
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2304 class G1CMDrainMarkingStackClosure: public VoidClosure { |
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2305 ConcurrentMark* _cm; |
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2306 CMTask* _task; |
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2307 bool _is_serial; |
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2308 public: |
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2309 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2310 _cm(cm), _task(task), _is_serial(is_serial) { |
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2311 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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2312 } |
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2313 |
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|
2314 void do_void() { |
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2315 do { |
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2316 if (_cm->verbose_high()) { |
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2317 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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2318 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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2319 } |
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2320 |
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2321 // We call CMTask::do_marking_step() to completely drain the local |
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2322 // and global marking stacks of entries pushed by the 'keep alive' |
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2323 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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|
2324 // |
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2325 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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2326 // if there's nothing more to do (i.e. we'completely drained the |
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2327 // entries that were pushed as a a result of applying the 'keep alive' |
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|
2328 // closure to the entries on the discovered ref lists) or we overflow |
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|
2329 // the global marking stack. |
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|
2330 // |
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|
2331 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2332 // flag while there may still be some work to do. (See the comment at |
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|
2333 // the beginning of CMTask::do_marking_step() for those conditions - |
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|
2334 // one of which is reaching the specified time target.) It is only |
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|
2335 // when CMTask::do_marking_step() returns without setting the |
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|
2336 // has_aborted() flag that the marking step has completed. |
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|
2337 |
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|
2338 _task->do_marking_step(1000000000.0 /* something very large */, |
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|
2339 true /* do_termination */, |
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|
2340 _is_serial); |
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|
2341 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2342 } |
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|
2343 }; |
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|
2344 |
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|
2345 // Implementation of AbstractRefProcTaskExecutor for parallel |
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|
2346 // reference processing at the end of G1 concurrent marking |
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|
2347 |
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|
2348 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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|
2349 private: |
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|
2350 G1CollectedHeap* _g1h; |
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|
2351 ConcurrentMark* _cm; |
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|
2352 WorkGang* _workers; |
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|
2353 int _active_workers; |
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|
2354 |
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|
2355 public: |
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|
2356 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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|
2357 ConcurrentMark* cm, |
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|
2358 WorkGang* workers, |
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|
2359 int n_workers) : |
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2360 _g1h(g1h), _cm(cm), |
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|
2361 _workers(workers), _active_workers(n_workers) { } |
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|
2362 |
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|
2363 // Executes the given task using concurrent marking worker threads. |
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|
2364 virtual void execute(ProcessTask& task); |
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|
2365 virtual void execute(EnqueueTask& task); |
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|
2366 }; |
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|
2367 |
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|
2368 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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|
2369 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2370 ProcessTask& _proc_task; |
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|
2371 G1CollectedHeap* _g1h; |
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|
2372 ConcurrentMark* _cm; |
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|
2373 |
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|
2374 public: |
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|
2375 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
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2376 G1CollectedHeap* g1h, |
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2377 ConcurrentMark* cm) : |
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|
2378 AbstractGangTask("Process reference objects in parallel"), |
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2379 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
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2380 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
2381 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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2382 } |
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2383 |
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2384 virtual void work(uint worker_id) { |
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|
2385 CMTask* task = _cm->task(worker_id); |
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2386 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2387 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
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2388 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
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2389 |
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2390 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2391 } |
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|
2392 }; |
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|
2393 |
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2394 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2395 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2396 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2397 |
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2398 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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2399 |
8788
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2400 // We need to reset the concurrency level before each |
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2401 // proxy task execution, so that the termination protocol |
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2402 // and overflow handling in CMTask::do_marking_step() knows |
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2403 // how many workers to wait for. |
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|
2404 _cm->set_concurrency(_active_workers); |
2174
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|
2405 _g1h->set_par_threads(_active_workers); |
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|
2406 _workers->run_task(&proc_task_proxy); |
234761c55641
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|
2407 _g1h->set_par_threads(0); |
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|
2408 } |
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|
2409 |
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|
2410 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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|
2411 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
234761c55641
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|
2412 EnqueueTask& _enq_task; |
234761c55641
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|
2413 |
234761c55641
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|
2414 public: |
3979
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|
2415 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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|
2416 AbstractGangTask("Enqueue reference objects in parallel"), |
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2417 _enq_task(enq_task) { } |
2174
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|
2418 |
4728
441e946dc1af
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|
2419 virtual void work(uint worker_id) { |
441e946dc1af
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|
2420 _enq_task.work(worker_id); |
2174
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2421 } |
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|
2422 }; |
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|
2423 |
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2424 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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2425 assert(_workers != NULL, "Need parallel worker threads."); |
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2426 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
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2427 |
3979
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|
2428 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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|
2429 |
8788
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|
2430 // Not strictly necessary but... |
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|
2431 // |
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|
2432 // We need to reset the concurrency level before each |
e864cc14ca75
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|
2433 // proxy task execution, so that the termination protocol |
e864cc14ca75
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|
2434 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
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|
2435 // how many workers to wait for. |
e864cc14ca75
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|
2436 _cm->set_concurrency(_active_workers); |
2174
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|
2437 _g1h->set_par_threads(_active_workers); |
234761c55641
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|
2438 _workers->run_task(&enq_task_proxy); |
234761c55641
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|
2439 _g1h->set_par_threads(0); |
234761c55641
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diff
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|
2440 } |
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|
2441 |
342 | 2442 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
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|
2443 if (has_overflown()) { |
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|
2444 // Skip processing the discovered references if we have |
e864cc14ca75
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|
2445 // overflown the global marking stack. Reference objects |
e864cc14ca75
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|
2446 // only get discovered once so it is OK to not |
e864cc14ca75
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diff
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|
2447 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
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|
2448 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
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|
2449 // less reference objects are discovered. |
e864cc14ca75
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|
2450 return; |
e864cc14ca75
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diff
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|
2451 } |
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|
2452 |
342 | 2453 ResourceMark rm; |
2454 HandleMark hm; | |
3975
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parents:
3914
diff
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|
2455 |
1847b501ae74
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3914
diff
changeset
|
2456 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1847b501ae74
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diff
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|
2457 |
1847b501ae74
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3914
diff
changeset
|
2458 // Is alive closure. |
1847b501ae74
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diff
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|
2459 G1CMIsAliveClosure g1_is_alive(g1h); |
1847b501ae74
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parents:
3914
diff
changeset
|
2460 |
1847b501ae74
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3914
diff
changeset
|
2461 // Inner scope to exclude the cleaning of the string and symbol |
1847b501ae74
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parents:
3914
diff
changeset
|
2462 // tables from the displayed time. |
1847b501ae74
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3914
diff
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|
2463 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2464 if (G1Log::finer()) { |
3975
1847b501ae74
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parents:
3914
diff
changeset
|
2465 gclog_or_tty->put(' '); |
1847b501ae74
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3914
diff
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|
2466 } |
20190
0982ec23da03
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brutisso
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diff
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|
2467 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm(), concurrent_gc_id()); |
3975
1847b501ae74
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|
2468 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2469 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
3975
1847b501ae74
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parents:
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diff
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|
2470 |
1847b501ae74
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3914
diff
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|
2471 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
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|
2472 // about how reference processing currently works in G1. |
1847b501ae74
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parents:
3914
diff
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|
2473 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2474 // Set the soft reference policy |
3975
1847b501ae74
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parents:
3914
diff
changeset
|
2475 rp->setup_policy(clear_all_soft_refs); |
1847b501ae74
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johnc
parents:
3914
diff
changeset
|
2476 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2477 |
8787
fa08949fe0cb
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parents:
8744
diff
changeset
|
2478 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2479 // in serial reference processing. Note these closures are also |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
2480 // used for serially processing (by the the current thread) the |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2481 // JNI references during parallel reference processing. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2482 // |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2483 // These closures do not need to synchronize with the worker |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2484 // threads involved in parallel reference processing as these |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2485 // instances are executed serially by the current thread (e.g. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2486 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2487 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
2488 // |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
2489 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2490 // their own instances of these closures, which do their own |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2491 // synchronization among themselves. |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2492 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2493 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
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|
2494 |
fa08949fe0cb
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8744
diff
changeset
|
2495 // We need at least one active thread. If reference processing |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2496 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
2497 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2498 // we utilize all the worker threads we can. |
fa08949fe0cb
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8744
diff
changeset
|
2499 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
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8744
diff
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|
2500 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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parents:
6812
diff
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|
2501 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
1847b501ae74
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|
2502 |
8787
fa08949fe0cb
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|
2503 // Parallel processing task executor. |
4093
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|
2504 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
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|
2505 g1h->workers(), active_workers); |
8787
fa08949fe0cb
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|
2506 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
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|
2507 |
8788
e864cc14ca75
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|
2508 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
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8787
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|
2509 // executing the remark task. |
e864cc14ca75
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|
2510 set_concurrency(active_workers); |
e864cc14ca75
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8787
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|
2511 |
8014
f90b9bceb8e5
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diff
changeset
|
2512 // Set the degree of MT processing here. If the discovery was done MT, |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2513 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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changeset
|
2514 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
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diff
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|
2515 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
f90b9bceb8e5
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changeset
|
2516 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
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|
2517 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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|
2518 // Process the weak references. |
10405 | 2519 const ReferenceProcessorStats& stats = |
2520 rp->process_discovered_references(&g1_is_alive, | |
2521 &g1_keep_alive, | |
2522 &g1_drain_mark_stack, | |
2523 executor, | |
20190
0982ec23da03
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brutisso
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|
2524 g1h->gc_timer_cm(), |
0982ec23da03
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brutisso
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diff
changeset
|
2525 concurrent_gc_id()); |
10405 | 2526 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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|
2527 |
f90b9bceb8e5
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changeset
|
2528 // The do_oop work routines of the keep_alive and drain_marking_stack |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2529 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2530 // global marking stack. |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2531 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2532 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2533 "mark stack should be empty (unless it overflowed)"); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2534 |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2535 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2536 // This should have been done already when we tried to push an |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2537 // entry on to the global mark stack. But let's do it again. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2538 set_has_overflown(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2539 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2540 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2541 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2542 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2543 rp->enqueue_discovered_references(executor); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2544 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2545 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2546 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2547 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2548 |
17750
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2549 if (has_overflown()) { |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2550 // We can not trust g1_is_alive if the marking stack overflowed |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2551 return; |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2552 } |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2553 |
17635
cb7ec2423207
8027454: Do not traverse string table during G1 remark when treating them as strong roots during initial mark
tschatzl
parents:
17634
diff
changeset
|
2554 g1h->unlink_string_and_symbol_table(&g1_is_alive, |
cb7ec2423207
8027454: Do not traverse string table during G1 remark when treating them as strong roots during initial mark
tschatzl
parents:
17634
diff
changeset
|
2555 /* process_strings */ false, // currently strings are always roots |
cb7ec2423207
8027454: Do not traverse string table during G1 remark when treating them as strong roots during initial mark
tschatzl
parents:
17634
diff
changeset
|
2556 /* process_symbols */ true); |
342 | 2557 } |
2558 | |
2559 void ConcurrentMark::swapMarkBitMaps() { | |
2560 CMBitMapRO* temp = _prevMarkBitMap; | |
2561 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2562 _nextMarkBitMap = (CMBitMap*) temp; | |
2563 } | |
2564 | |
2565 class CMRemarkTask: public AbstractGangTask { | |
2566 private: | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2567 ConcurrentMark* _cm; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2568 bool _is_serial; |
342 | 2569 public: |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2570 void work(uint worker_id) { |
342 | 2571 // Since all available tasks are actually started, we should |
2572 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2573 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2574 CMTask* task = _cm->task(worker_id); |
342 | 2575 task->record_start_time(); |
2576 do { | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2577 task->do_marking_step(1000000000.0 /* something very large */, |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2578 true /* do_termination */, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2579 _is_serial); |
342 | 2580 } while (task->has_aborted() && !_cm->has_overflown()); |
2581 // If we overflow, then we do not want to restart. We instead | |
2582 // want to abort remark and do concurrent marking again. | |
2583 task->record_end_time(); | |
2584 } | |
2585 } | |
2586 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2587 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2588 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2589 _cm->terminator()->reset_for_reuse(active_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2590 } |
342 | 2591 }; |
2592 | |
2593 void ConcurrentMark::checkpointRootsFinalWork() { | |
2594 ResourceMark rm; | |
2595 HandleMark hm; | |
2596 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2597 | |
2598 g1h->ensure_parsability(false); | |
2599 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2600 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2601 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2602 // this is remark, so we'll use up all active threads |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2603 uint active_workers = g1h->workers()->active_workers(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2604 if (active_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2605 assert(active_workers > 0, "Should have been set earlier"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2606 active_workers = (uint) ParallelGCThreads; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2607 g1h->workers()->set_active_workers(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2608 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2609 set_concurrency_and_phase(active_workers, false /* concurrent */); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2610 // Leave _parallel_marking_threads at it's |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2611 // value originally calculated in the ConcurrentMark |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2612 // constructor and pass values of the active workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2613 // through the gang in the task. |
342 | 2614 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2615 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2616 // We will start all available threads, even if we decide that the |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2617 // active_workers will be fewer. The extra ones will just bail out |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2618 // immediately. |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2619 g1h->set_par_threads(active_workers); |
342 | 2620 g1h->workers()->run_task(&remarkTask); |
2621 g1h->set_par_threads(0); | |
2622 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2623 G1CollectedHeap::StrongRootsScope srs(g1h); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2624 uint active_workers = 1; |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2625 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2626 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2627 // Note - if there's no work gang then the VMThread will be |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2628 // the thread to execute the remark - serially. We have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2629 // to pass true for the is_serial parameter so that |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2630 // CMTask::do_marking_step() doesn't enter the sync |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2631 // barriers in the event of an overflow. Doing so will |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2632 // cause an assert that the current thread is not a |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2633 // concurrent GC thread. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2634 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2635 remarkTask.work(0); |
2636 } | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2637 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
8789
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2638 guarantee(has_overflown() || |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2639 satb_mq_set.completed_buffers_num() == 0, |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2640 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2641 BOOL_TO_STR(has_overflown()), |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2642 satb_mq_set.completed_buffers_num())); |
342 | 2643 |
2644 print_stats(); | |
2645 } | |
2646 | |
1044 | 2647 #ifndef PRODUCT |
2648 | |
1388 | 2649 class PrintReachableOopClosure: public OopClosure { |
342 | 2650 private: |
2651 G1CollectedHeap* _g1h; | |
2652 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2653 VerifyOption _vo; |
1388 | 2654 bool _all; |
342 | 2655 |
2656 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2657 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2658 VerifyOption vo, |
1388 | 2659 bool all) : |
1044 | 2660 _g1h(G1CollectedHeap::heap()), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2661 _out(out), _vo(vo), _all(all) { } |
342 | 2662 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2663 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2664 void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2665 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2666 template <class T> void do_oop_work(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2667 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2668 const char* str = NULL; |
2669 const char* str2 = ""; | |
2670 | |
1388 | 2671 if (obj == NULL) { |
2672 str = ""; | |
2673 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2674 str = " O"; | |
2675 } else { | |
342 | 2676 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2677 guarantee(hr != NULL, "invariant"); |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2678 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2679 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2680 |
2681 if (over_tams) { | |
1388 | 2682 str = " >"; |
2683 if (marked) { | |
342 | 2684 str2 = " AND MARKED"; |
1044 | 2685 } |
1388 | 2686 } else if (marked) { |
2687 str = " M"; | |
1044 | 2688 } else { |
1388 | 2689 str = " NOT"; |
1044 | 2690 } |
342 | 2691 } |
2692 | |
1388 | 2693 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2694 p2i(p), p2i((void*) obj), str, str2); |
342 | 2695 } |
2696 }; | |
2697 | |
1388 | 2698 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2699 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2700 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2701 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2702 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2703 bool _all; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2704 HeapRegion* _hr; |
342 | 2705 |
2706 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2707 PrintReachableObjectClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2708 VerifyOption vo, |
1388 | 2709 bool all, |
2710 HeapRegion* hr) : | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2711 _g1h(G1CollectedHeap::heap()), |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2712 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2713 |
2714 void do_object(oop o) { | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2715 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2716 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2717 bool print_it = _all || over_tams || marked; |
2718 | |
2719 if (print_it) { | |
2720 _out->print_cr(" "PTR_FORMAT"%s", | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2721 p2i((void *)o), (over_tams) ? " >" : (marked) ? " M" : ""); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2722 PrintReachableOopClosure oopCl(_out, _vo, _all); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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2723 o->oop_iterate_no_header(&oopCl); |
1388 | 2724 } |
342 | 2725 } |
2726 }; | |
2727 | |
1388 | 2728 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2729 private: |
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2730 G1CollectedHeap* _g1h; |
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2731 outputStream* _out; |
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2732 VerifyOption _vo; |
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2733 bool _all; |
342 | 2734 |
2735 public: | |
2736 bool doHeapRegion(HeapRegion* hr) { | |
2737 HeapWord* b = hr->bottom(); | |
2738 HeapWord* e = hr->end(); | |
2739 HeapWord* t = hr->top(); | |
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2740 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2741 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
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2742 "TAMS: " PTR_FORMAT, p2i(b), p2i(e), p2i(t), p2i(p)); |
1388 | 2743 _out->cr(); |
2744 | |
2745 HeapWord* from = b; | |
2746 HeapWord* to = t; | |
2747 | |
2748 if (to > from) { | |
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2749 _out->print_cr("Objects in [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(from), p2i(to)); |
1388 | 2750 _out->cr(); |
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2751 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2752 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2753 _out->cr(); | |
2754 } | |
342 | 2755 |
2756 return false; | |
2757 } | |
2758 | |
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2759 PrintReachableRegionClosure(outputStream* out, |
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2760 VerifyOption vo, |
1388 | 2761 bool all) : |
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2762 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2763 }; |
2764 | |
1388 | 2765 void ConcurrentMark::print_reachable(const char* str, |
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2766 VerifyOption vo, |
1388 | 2767 bool all) { |
2768 gclog_or_tty->cr(); | |
2769 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2770 |
2771 if (G1PrintReachableBaseFile == NULL) { | |
2772 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2773 return; | |
2774 } | |
2775 | |
2776 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2777 (JVM_MAXPATHLEN - 1)) { | |
2778 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2779 return; | |
2780 } | |
2781 | |
2782 char file_name[JVM_MAXPATHLEN]; | |
2783 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2784 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2785 | |
2786 fileStream fout(file_name); | |
2787 if (!fout.is_open()) { | |
2788 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2789 return; | |
2790 } | |
2791 | |
2792 outputStream* out = &fout; | |
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2793 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2794 out->cr(); |
2795 | |
1388 | 2796 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2797 out->cr(); |
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2798 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2799 _g1h->heap_region_iterate(&rcl); |
1044 | 2800 out->cr(); |
2801 | |
2802 gclog_or_tty->print_cr(" done"); | |
1388 | 2803 gclog_or_tty->flush(); |
342 | 2804 } |
2805 | |
1044 | 2806 #endif // PRODUCT |
2807 | |
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2808 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2809 // Note we are overriding the read-only view of the prev map here, via |
2810 // the cast. | |
2811 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2812 } |
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2813 |
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2814 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2815 _nextMarkBitMap->clearRange(mr); |
2816 } | |
2817 | |
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2818 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2819 clearRangePrevBitmap(mr); |
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2820 clearRangeNextBitmap(mr); |
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2821 } |
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2822 |
342 | 2823 HeapRegion* |
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2824 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2825 // "checkpoint" the finger |
2826 HeapWord* finger = _finger; | |
2827 | |
2828 // _heap_end will not change underneath our feet; it only changes at | |
2829 // yield points. | |
2830 while (finger < _heap_end) { | |
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2831 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2832 |
3771 | 2833 // Note on how this code handles humongous regions. In the |
2834 // normal case the finger will reach the start of a "starts | |
2835 // humongous" (SH) region. Its end will either be the end of the | |
2836 // last "continues humongous" (CH) region in the sequence, or the | |
2837 // standard end of the SH region (if the SH is the only region in | |
2838 // the sequence). That way claim_region() will skip over the CH | |
2839 // regions. However, there is a subtle race between a CM thread | |
2840 // executing this method and a mutator thread doing a humongous | |
2841 // object allocation. The two are not mutually exclusive as the CM | |
2842 // thread does not need to hold the Heap_lock when it gets | |
2843 // here. So there is a chance that claim_region() will come across | |
2844 // a free region that's in the progress of becoming a SH or a CH | |
2845 // region. In the former case, it will either | |
2846 // a) Miss the update to the region's end, in which case it will | |
2847 // visit every subsequent CH region, will find their bitmaps | |
2848 // empty, and do nothing, or | |
2849 // b) Will observe the update of the region's end (in which case | |
2850 // it will skip the subsequent CH regions). | |
2851 // If it comes across a region that suddenly becomes CH, the | |
2852 // scenario will be similar to b). So, the race between | |
2853 // claim_region() and a humongous object allocation might force us | |
2854 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2855 // iterations) but it should not introduce and correctness issues. | |
2856 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2857 HeapWord* bottom = curr_region->bottom(); |
2858 HeapWord* end = curr_region->end(); | |
2859 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2860 | |
3771 | 2861 if (verbose_low()) { |
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2862 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2863 "["PTR_FORMAT", "PTR_FORMAT"), " |
2864 "limit = "PTR_FORMAT, | |
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2865 worker_id, p2i(curr_region), p2i(bottom), p2i(end), p2i(limit)); |
3771 | 2866 } |
2867 | |
2868 // Is the gap between reading the finger and doing the CAS too long? | |
2869 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2870 if (res == finger) { |
2871 // we succeeded | |
2872 | |
2873 // notice that _finger == end cannot be guaranteed here since, | |
2874 // someone else might have moved the finger even further | |
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2875 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2876 |
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2877 if (verbose_low()) { |
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2878 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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2879 PTR_FORMAT, worker_id, p2i(curr_region)); |
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2880 } |
342 | 2881 |
2882 if (limit > bottom) { | |
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2883 if (verbose_low()) { |
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2884 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2885 "returning it ", worker_id, p2i(curr_region)); |
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2886 } |
342 | 2887 return curr_region; |
2888 } else { | |
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|
2889 assert(limit == bottom, |
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2890 "the region limit should be at bottom"); |
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|
2891 if (verbose_low()) { |
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2892 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2893 "returning NULL", worker_id, p2i(curr_region)); |
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2894 } |
342 | 2895 // we return NULL and the caller should try calling |
2896 // claim_region() again. | |
2897 return NULL; | |
2898 } | |
2899 } else { | |
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2900 assert(_finger > finger, "the finger should have moved forward"); |
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|
2901 if (verbose_low()) { |
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2902 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 2903 "global finger = "PTR_FORMAT", " |
2904 "our finger = "PTR_FORMAT, | |
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2905 worker_id, p2i(_finger), p2i(finger)); |
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2906 } |
342 | 2907 |
2908 // read it again | |
2909 finger = _finger; | |
2910 } | |
2911 } | |
2912 | |
2913 return NULL; | |
2914 } | |
2915 | |
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2916 #ifndef PRODUCT |
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2917 enum VerifyNoCSetOopsPhase { |
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2918 VerifyNoCSetOopsStack, |
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2919 VerifyNoCSetOopsQueues, |
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2920 VerifyNoCSetOopsSATBCompleted, |
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2921 VerifyNoCSetOopsSATBThread |
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2922 }; |
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2923 |
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2924 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2925 private: |
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2926 G1CollectedHeap* _g1h; |
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2927 VerifyNoCSetOopsPhase _phase; |
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2928 int _info; |
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2929 |
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2930 const char* phase_str() { |
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2931 switch (_phase) { |
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2932 case VerifyNoCSetOopsStack: return "Stack"; |
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2933 case VerifyNoCSetOopsQueues: return "Queue"; |
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2934 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2935 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2936 default: ShouldNotReachHere(); |
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2937 } |
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2938 return NULL; |
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2939 } |
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2940 |
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2941 void do_object_work(oop obj) { |
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2942 guarantee(!_g1h->obj_in_cs(obj), |
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2943 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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2944 p2i((void*) obj), phase_str(), _info)); |
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2945 } |
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2946 |
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2947 public: |
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2948 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2949 |
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2950 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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2951 _phase = phase; |
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2952 _info = info; |
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2953 } |
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2954 |
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2955 virtual void do_oop(oop* p) { |
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2956 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2957 do_object_work(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2958 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
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|
2959 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
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|
2960 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
2961 // We should not come across narrow oops while scanning marking |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
2962 // stacks and SATB buffers. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
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|
2963 ShouldNotReachHere(); |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
2964 } |
2ace1c4ee8da
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tonyp
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diff
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|
2965 |
2ace1c4ee8da
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tonyp
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|
2966 virtual void do_object(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
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|
2967 do_object_work(obj); |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
2968 } |
2ace1c4ee8da
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|
2969 }; |
2ace1c4ee8da
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|
2970 |
2ace1c4ee8da
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tonyp
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|
2971 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
2ace1c4ee8da
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diff
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|
2972 bool verify_enqueued_buffers, |
2ace1c4ee8da
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|
2973 bool verify_thread_buffers, |
2ace1c4ee8da
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|
2974 bool verify_fingers) { |
2ace1c4ee8da
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|
2975 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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|
2976 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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|
2977 return; |
342 | 2978 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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|
2979 |
4787
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|
2980 VerifyNoCSetOopsClosure cl; |
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|
2981 |
2ace1c4ee8da
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|
2982 if (verify_stacks) { |
2ace1c4ee8da
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|
2983 // Verify entries on the global mark stack |
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|
2984 cl.set_phase(VerifyNoCSetOopsStack); |
2ace1c4ee8da
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|
2985 _markStack.oops_do(&cl); |
2ace1c4ee8da
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|
2986 |
2ace1c4ee8da
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|
2987 // Verify entries on the task queues |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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|
2988 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
2ace1c4ee8da
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tonyp
parents:
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diff
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|
2989 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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|
2990 CMTaskQueue* queue = _task_queues->queue(i); |
4787
2ace1c4ee8da
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diff
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|
2991 queue->oops_do(&cl); |
2ace1c4ee8da
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parents:
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|
2992 } |
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diff
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|
2993 } |
2ace1c4ee8da
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parents:
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|
2994 |
2ace1c4ee8da
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parents:
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diff
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|
2995 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
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parents:
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|
2996 |
2ace1c4ee8da
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diff
changeset
|
2997 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
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parents:
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diff
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|
2998 if (verify_enqueued_buffers) { |
2ace1c4ee8da
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parents:
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diff
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|
2999 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
3000 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
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parents:
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diff
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|
3001 } |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3002 |
2ace1c4ee8da
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diff
changeset
|
3003 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3004 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3005 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
3006 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
3007 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3008 |
4787
2ace1c4ee8da
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4783
diff
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|
3009 if (verify_fingers) { |
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3010 // Verify the global finger |
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3011 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3012 if (global_finger != NULL && global_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3013 // The global finger always points to a heap region boundary. We |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3014 // 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
|
3015 // given that the global finger could be pointing to a free region |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3016 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3017 // happens, heap_region_containing() will return the bottom of the |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3018 // 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
|
3019 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3020 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
|
3021 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3022 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3023 p2i(global_finger), HR_FORMAT_PARAMS(global_hr))); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3024 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3025 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3026 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3027 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
|
3028 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
|
3029 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3030 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3031 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
|
3032 // 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
|
3033 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
|
3034 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3035 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3036 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3037 p2i(task_finger), HR_FORMAT_PARAMS(task_hr))); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3038 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3039 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3040 } |
342 | 3041 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3042 #endif // PRODUCT |
342 | 3043 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3044 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3045 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3046 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3047 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3049 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3050 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3051 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3052 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3054 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3055 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3056 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3057 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3058 _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
|
3059 _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
|
3060 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3061 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3062 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3063 // 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
|
3064 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3065 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3066 // "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
|
3067 // 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
|
3068 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3069 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3070 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3071 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3072 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3073 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3074 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3075 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3076 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3077 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3078 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3079 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3080 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3081 p2i(start), p2i(limit), p2i(hr->top()), p2i(hr->end()))); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3082 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3083 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3084 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3085 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3086 // 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
|
3087 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3088 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3089 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3090 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3091 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
|
3092 // '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
|
3093 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
|
3094 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3095 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
|
3096 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
|
3097 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
|
3098 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3099 // 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
|
3100 // 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
|
3101 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3102 // 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
|
3103 // 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
|
3104 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3105 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3106 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
|
3107 limit_idx += 1; |
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 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3110 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3111 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3112 // 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
|
3113 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3114 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3115 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3116 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
|
3117 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
|
3118 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
|
3119 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3120 // 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
|
3121 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3122 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3123 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3124 // 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
|
3125 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3126 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
|
3127 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3128 while (scan_idx < limit_idx) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3129 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
|
3130 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3131 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
|
3132 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3133 // 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
|
3134 // 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
|
3135 // 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
|
3136 // 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
|
3137 // passed in for left offset here. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3138 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
|
3139 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
|
3140 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3141 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3142 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3143 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3144 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3145 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3146 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3147 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3148 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3149 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3150 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3151 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3152 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3153 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3154 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3155 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3156 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3157 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3158 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3159 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3160 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3161 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3162 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3163 uint max_worker_id, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3164 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3165 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3166 _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
|
3167 _max_worker_id(max_worker_id), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3168 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3169 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3170 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
|
3171 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
|
3172 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3173 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3174 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3175 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3176 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3177 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3178 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3179 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3180 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3181 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3182 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3183 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3184 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3185 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3186 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3187 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3188 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3189 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
|
3190 _max_worker_id, n_workers); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3191 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3192 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3193 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3194 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3195 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3196 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3197 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3198 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3199 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3200 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3201 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3202 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3203 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3204 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3205 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3206 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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|
3207 // Clear the per-worker arrays used to store the per-region counting data |
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|
3208 void ConcurrentMark::clear_all_count_data() { |
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6484965: G1: piggy-back liveness accounting phase on marking
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|
3209 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
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diff
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|
3210 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3211 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3212 _card_bm.clear(); |
d30fa85f9994
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changeset
|
3213 |
d30fa85f9994
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|
3214 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
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changeset
|
3215 // of the final counting task. |
d30fa85f9994
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diff
changeset
|
3216 _region_bm.clear(); |
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|
3217 |
6010
720b6a76dd9d
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|
3218 uint max_regions = _g1h->max_regions(); |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
3219 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
3220 |
8a5ea0a9ccc4
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diff
changeset
|
3221 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
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changeset
|
3222 BitMap* task_card_bm = count_card_bitmap_for(i); |
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|
3223 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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|
3224 |
d30fa85f9994
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|
3225 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
d30fa85f9994
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|
3226 assert(marked_bytes_array != NULL, "uninitialized"); |
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|
3227 |
6010
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|
3228 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
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|
3229 task_card_bm->clear(); |
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|
3230 } |
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|
3231 } |
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|
3232 |
342 | 3233 void ConcurrentMark::print_stats() { |
3234 if (verbose_stats()) { | |
3235 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3236 for (size_t i = 0; i < _active_tasks; ++i) { | |
3237 _tasks[i]->print_stats(); | |
3238 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3239 } | |
3240 } | |
3241 } | |
3242 | |
3243 // abandon current marking iteration due to a Full GC | |
3244 void ConcurrentMark::abort() { | |
3245 // Clear all marks to force marking thread to do nothing | |
3246 _nextMarkBitMap->clearAll(); | |
4836
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3247 // Clear the liveness counting data |
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|
3248 clear_all_count_data(); |
342 | 3249 // Empty mark stack |
7450
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|
3250 reset_marking_state(); |
6862
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|
3251 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3252 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
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1833
diff
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|
3253 } |
17949
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8040803: G1: Concurrent mark hangs when mark stack overflows
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parents:
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changeset
|
3254 _first_overflow_barrier_sync.abort(); |
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
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|
3255 _second_overflow_barrier_sync.abort(); |
20190
0982ec23da03
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|
3256 const GCId& gc_id = _g1h->gc_tracer_cm()->gc_id(); |
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|
3257 if (!gc_id.is_undefined()) { |
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|
3258 // We can do multiple full GCs before ConcurrentMarkThread::run() gets a chance |
0982ec23da03
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|
3259 // to detect that it was aborted. Only keep track of the first GC id that we aborted. |
0982ec23da03
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|
3260 _aborted_gc_id = gc_id; |
0982ec23da03
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|
3261 } |
342 | 3262 _has_aborted = true; |
3263 | |
3264 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3265 satb_mq_set.abandon_partial_marking(); | |
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
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|
3266 // This can be called either during or outside marking, we'll read |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
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changeset
|
3267 // the expected_active value from the SATB queue set. |
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changeset
|
3268 satb_mq_set.set_active_all_threads( |
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1314
diff
changeset
|
3269 false, /* new active value */ |
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tonyp
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1314
diff
changeset
|
3270 satb_mq_set.is_active() /* expected_active */); |
10405 | 3271 |
3272 _g1h->trace_heap_after_concurrent_cycle(); | |
3273 _g1h->register_concurrent_cycle_end(); | |
342 | 3274 } |
3275 | |
20190
0982ec23da03
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|
3276 const GCId& ConcurrentMark::concurrent_gc_id() { |
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|
3277 if (has_aborted()) { |
0982ec23da03
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diff
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|
3278 return _aborted_gc_id; |
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diff
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|
3279 } |
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|
3280 return _g1h->gc_tracer_cm()->gc_id(); |
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|
3281 } |
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|
3282 |
342 | 3283 static void print_ms_time_info(const char* prefix, const char* name, |
3284 NumberSeq& ns) { | |
3285 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3286 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3287 if (ns.num() > 0) { | |
3288 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3289 prefix, ns.sd(), ns.maximum()); | |
3290 } | |
3291 } | |
3292 | |
3293 void ConcurrentMark::print_summary_info() { | |
3294 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3295 print_ms_time_info(" ", "init marks", _init_times); | |
3296 print_ms_time_info(" ", "remarks", _remark_times); | |
3297 { | |
3298 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3299 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3300 | |
3301 } | |
3302 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3303 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3304 _total_counting_time, | |
3305 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3306 (double)_cleanup_times.num() | |
3307 : 0.0)); | |
3308 if (G1ScrubRemSets) { | |
3309 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3310 _total_rs_scrub_time, | |
3311 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3312 (double)_cleanup_times.num() | |
3313 : 0.0)); | |
3314 } | |
3315 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3316 (_init_times.sum() + _remark_times.sum() + | |
3317 _cleanup_times.sum())/1000.0); | |
3318 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
4836
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|
3319 "(%8.2f s marking).", |
342 | 3320 cmThread()->vtime_accum(), |
4836
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diff
changeset
|
3321 cmThread()->vtime_mark_accum()); |
342 | 3322 } |
3323 | |
1019 | 3324 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
8008
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
8006
diff
changeset
|
3325 if (use_parallel_marking_threads()) { |
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
8006
diff
changeset
|
3326 _parallel_workers->print_worker_threads_on(st); |
256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
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8006
diff
changeset
|
3327 } |
1019 | 3328 } |
3329 | |
9076
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
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diff
changeset
|
3330 void ConcurrentMark::print_on_error(outputStream* st) const { |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8789
diff
changeset
|
3331 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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parents:
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diff
changeset
|
3332 p2i(_prevMarkBitMap), p2i(_nextMarkBitMap)); |
9076
7b835924c31c
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stefank
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8789
diff
changeset
|
3333 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
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diff
changeset
|
3334 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
7b835924c31c
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stefank
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8789
diff
changeset
|
3335 } |
7b835924c31c
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diff
changeset
|
3336 |
342 | 3337 // We take a break if someone is trying to stop the world. |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3338 bool ConcurrentMark::do_yield_check(uint worker_id) { |
20192 | 3339 if (SuspendibleThreadSet::should_yield()) { |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3340 if (worker_id == 0) { |
342 | 3341 _g1h->g1_policy()->record_concurrent_pause(); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
3342 } |
20192 | 3343 SuspendibleThreadSet::yield(); |
342 | 3344 return true; |
3345 } else { | |
3346 return false; | |
3347 } | |
3348 } | |
3349 | |
3350 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3351 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3352 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3353 } | |
3354 | |
3355 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3356 void* last) { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
3357 return containing_card_is_marked(start) && |
23d434c6290d
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tonyp
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3772
diff
changeset
|
3358 containing_card_is_marked(last); |
342 | 3359 } |
3360 | |
3361 #ifndef PRODUCT | |
3362 // for debugging purposes | |
3363 void ConcurrentMark::print_finger() { | |
3364 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
17937
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diff
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|
3365 p2i(_heap_start), p2i(_heap_end), p2i(_finger)); |
6862
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diff
changeset
|
3366 for (uint i = 0; i < _max_worker_id; ++i) { |
17937
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drchase
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diff
changeset
|
3367 gclog_or_tty->print(" %u: " PTR_FORMAT, i, p2i(_tasks[i]->finger())); |
342 | 3368 } |
17937
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diff
changeset
|
3369 gclog_or_tty->cr(); |
342 | 3370 } |
3371 #endif | |
3372 | |
3771 | 3373 void CMTask::scan_object(oop obj) { |
3374 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3375 | |
3376 if (_cm->verbose_high()) { | |
6862
8a5ea0a9ccc4
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johnc
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6812
diff
changeset
|
3377 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
17937
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drchase
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diff
changeset
|
3378 _worker_id, p2i((void*) obj)); |
3771 | 3379 } |
3380 | |
3381 size_t obj_size = obj->size(); | |
3382 _words_scanned += obj_size; | |
3383 | |
3384 obj->oop_iterate(_cm_oop_closure); | |
3385 statsOnly( ++_objs_scanned ); | |
3386 check_limits(); | |
3387 } | |
3388 | |
342 | 3389 // Closure for iteration over bitmaps |
3390 class CMBitMapClosure : public BitMapClosure { | |
3391 private: | |
3392 // the bitmap that is being iterated over | |
3393 CMBitMap* _nextMarkBitMap; | |
3394 ConcurrentMark* _cm; | |
3395 CMTask* _task; | |
3396 | |
3397 public: | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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4837
diff
changeset
|
3398 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
2a0172480595
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diff
changeset
|
3399 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3400 |
3401 bool do_bit(size_t offset) { | |
3402 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3403 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
3404 assert( addr < _cm->finger(), "invariant"); |
342 | 3405 |
5988
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4837
diff
changeset
|
3406 statsOnly( _task->increase_objs_found_on_bitmap() ); |
2a0172480595
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tonyp
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4837
diff
changeset
|
3407 assert(addr >= _task->finger(), "invariant"); |
2a0172480595
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4837
diff
changeset
|
3408 |
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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4837
diff
changeset
|
3409 // We move that task's local finger along. |
2a0172480595
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parents:
4837
diff
changeset
|
3410 _task->move_finger_to(addr); |
342 | 3411 |
3412 _task->scan_object(oop(addr)); | |
3413 // we only partially drain the local queue and global stack | |
3414 _task->drain_local_queue(true); | |
3415 _task->drain_global_stack(true); | |
3416 | |
3417 // if the has_aborted flag has been raised, we need to bail out of | |
3418 // the iteration | |
3419 return !_task->has_aborted(); | |
3420 } | |
3421 }; | |
3422 | |
3423 // Closure for iterating over objects, currently only used for | |
3424 // processing SATB buffers. | |
3425 class CMObjectClosure : public ObjectClosure { | |
3426 private: | |
3427 CMTask* _task; | |
3428 | |
3429 public: | |
3430 void do_object(oop obj) { | |
3431 _task->deal_with_reference(obj); | |
3432 } | |
3433 | |
3434 CMObjectClosure(CMTask* task) : _task(task) { } | |
3435 }; | |
3436 | |
3771 | 3437 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3438 ConcurrentMark* cm, | |
3439 CMTask* task) | |
3440 : _g1h(g1h), _cm(cm), _task(task) { | |
3441 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3442 | |
3443 if (G1UseConcMarkReferenceProcessing) { | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
3444 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3445 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3446 } |
3771 | 3447 } |
342 | 3448 |
3449 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3450 // Separated the asserts so that we know which one fires. |
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3451 assert(hr != NULL, |
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3452 "claim_region() should have filtered out continues humongous regions"); |
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3453 assert(!hr->continuesHumongous(), |
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3454 "claim_region() should have filtered out continues humongous regions"); |
342 | 3455 |
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3456 if (_cm->verbose_low()) { |
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3457 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3458 _worker_id, p2i(hr)); |
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3459 } |
342 | 3460 |
3461 _curr_region = hr; | |
3462 _finger = hr->bottom(); | |
3463 update_region_limit(); | |
3464 } | |
3465 | |
3466 void CMTask::update_region_limit() { | |
3467 HeapRegion* hr = _curr_region; | |
3468 HeapWord* bottom = hr->bottom(); | |
3469 HeapWord* limit = hr->next_top_at_mark_start(); | |
3470 | |
3471 if (limit == bottom) { | |
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3472 if (_cm->verbose_low()) { |
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3473 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3474 "["PTR_FORMAT", "PTR_FORMAT")", |
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3475 _worker_id, p2i(bottom), p2i(limit)); |
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3476 } |
342 | 3477 // The region was collected underneath our feet. |
3478 // We set the finger to bottom to ensure that the bitmap | |
3479 // iteration that will follow this will not do anything. | |
3480 // (this is not a condition that holds when we set the region up, | |
3481 // as the region is not supposed to be empty in the first place) | |
3482 _finger = bottom; | |
3483 } else if (limit >= _region_limit) { | |
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3484 assert(limit >= _finger, "peace of mind"); |
342 | 3485 } else { |
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3486 assert(limit < _region_limit, "only way to get here"); |
342 | 3487 // This can happen under some pretty unusual circumstances. An |
3488 // evacuation pause empties the region underneath our feet (NTAMS | |
3489 // at bottom). We then do some allocation in the region (NTAMS | |
3490 // stays at bottom), followed by the region being used as a GC | |
3491 // alloc region (NTAMS will move to top() and the objects | |
3492 // originally below it will be grayed). All objects now marked in | |
3493 // the region are explicitly grayed, if below the global finger, | |
3494 // and we do not need in fact to scan anything else. So, we simply | |
3495 // set _finger to be limit to ensure that the bitmap iteration | |
3496 // doesn't do anything. | |
3497 _finger = limit; | |
3498 } | |
3499 | |
3500 _region_limit = limit; | |
3501 } | |
3502 | |
3503 void CMTask::giveup_current_region() { | |
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3504 assert(_curr_region != NULL, "invariant"); |
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3505 if (_cm->verbose_low()) { |
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3506 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3507 _worker_id, p2i(_curr_region)); |
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3508 } |
342 | 3509 clear_region_fields(); |
3510 } | |
3511 | |
3512 void CMTask::clear_region_fields() { | |
3513 // Values for these three fields that indicate that we're not | |
3514 // holding on to a region. | |
3515 _curr_region = NULL; | |
3516 _finger = NULL; | |
3517 _region_limit = NULL; | |
3518 } | |
3519 | |
3771 | 3520 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3521 if (cm_oop_closure == NULL) { | |
3522 assert(_cm_oop_closure != NULL, "invariant"); | |
3523 } else { | |
3524 assert(_cm_oop_closure == NULL, "invariant"); | |
3525 } | |
3526 _cm_oop_closure = cm_oop_closure; | |
3527 } | |
3528 | |
342 | 3529 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3530 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3531 |
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3532 if (_cm->verbose_low()) { |
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3533 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3534 } |
342 | 3535 |
3536 _nextMarkBitMap = nextMarkBitMap; | |
3537 clear_region_fields(); | |
3538 | |
3539 _calls = 0; | |
3540 _elapsed_time_ms = 0.0; | |
3541 _termination_time_ms = 0.0; | |
3542 _termination_start_time_ms = 0.0; | |
3543 | |
3544 #if _MARKING_STATS_ | |
3545 _local_pushes = 0; | |
3546 _local_pops = 0; | |
3547 _local_max_size = 0; | |
3548 _objs_scanned = 0; | |
3549 _global_pushes = 0; | |
3550 _global_pops = 0; | |
3551 _global_max_size = 0; | |
3552 _global_transfers_to = 0; | |
3553 _global_transfers_from = 0; | |
3554 _regions_claimed = 0; | |
3555 _objs_found_on_bitmap = 0; | |
3556 _satb_buffers_processed = 0; | |
3557 _steal_attempts = 0; | |
3558 _steals = 0; | |
3559 _aborted = 0; | |
3560 _aborted_overflow = 0; | |
3561 _aborted_cm_aborted = 0; | |
3562 _aborted_yield = 0; | |
3563 _aborted_timed_out = 0; | |
3564 _aborted_satb = 0; | |
3565 _aborted_termination = 0; | |
3566 #endif // _MARKING_STATS_ | |
3567 } | |
3568 | |
3569 bool CMTask::should_exit_termination() { | |
3570 regular_clock_call(); | |
3571 // This is called when we are in the termination protocol. We should | |
3572 // quit if, for some reason, this task wants to abort or the global | |
3573 // stack is not empty (this means that we can get work from it). | |
3574 return !_cm->mark_stack_empty() || has_aborted(); | |
3575 } | |
3576 | |
3577 void CMTask::reached_limit() { | |
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3578 assert(_words_scanned >= _words_scanned_limit || |
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3579 _refs_reached >= _refs_reached_limit , |
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3580 "shouldn't have been called otherwise"); |
342 | 3581 regular_clock_call(); |
3582 } | |
3583 | |
3584 void CMTask::regular_clock_call() { | |
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3585 if (has_aborted()) return; |
342 | 3586 |
3587 // First, we need to recalculate the words scanned and refs reached | |
3588 // limits for the next clock call. | |
3589 recalculate_limits(); | |
3590 | |
3591 // During the regular clock call we do the following | |
3592 | |
3593 // (1) If an overflow has been flagged, then we abort. | |
3594 if (_cm->has_overflown()) { | |
3595 set_has_aborted(); | |
3596 return; | |
3597 } | |
3598 | |
3599 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3600 // to check anything else. The other steps are only needed during | |
3601 // the concurrent marking phase. | |
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3602 if (!concurrent()) return; |
342 | 3603 |
3604 // (2) If marking has been aborted for Full GC, then we also abort. | |
3605 if (_cm->has_aborted()) { | |
3606 set_has_aborted(); | |
3607 statsOnly( ++_aborted_cm_aborted ); | |
3608 return; | |
3609 } | |
3610 | |
3611 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3612 | |
3613 // (3) If marking stats are enabled, then we update the step history. | |
3614 #if _MARKING_STATS_ | |
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3615 if (_words_scanned >= _words_scanned_limit) { |
342 | 3616 ++_clock_due_to_scanning; |
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3617 } |
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3618 if (_refs_reached >= _refs_reached_limit) { |
342 | 3619 ++_clock_due_to_marking; |
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3620 } |
342 | 3621 |
3622 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3623 _interval_start_time_ms = curr_time_ms; | |
3624 _all_clock_intervals_ms.add(last_interval_ms); | |
3625 | |
3626 if (_cm->verbose_medium()) { | |
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3627 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
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3628 "scanned = %d%s, refs reached = %d%s", |
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3629 _worker_id, last_interval_ms, |
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3630 _words_scanned, |
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3631 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3632 _refs_reached, |
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3633 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3634 } |
3635 #endif // _MARKING_STATS_ | |
3636 | |
3637 // (4) We check whether we should yield. If we have to, then we abort. | |
20192 | 3638 if (SuspendibleThreadSet::should_yield()) { |
342 | 3639 // We should yield. To do this we abort the task. The caller is |
3640 // responsible for yielding. | |
3641 set_has_aborted(); | |
3642 statsOnly( ++_aborted_yield ); | |
3643 return; | |
3644 } | |
3645 | |
3646 // (5) We check whether we've reached our time quota. If we have, | |
3647 // then we abort. | |
3648 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3649 if (elapsed_time_ms > _time_target_ms) { | |
3650 set_has_aborted(); | |
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3651 _has_timed_out = true; |
342 | 3652 statsOnly( ++_aborted_timed_out ); |
3653 return; | |
3654 } | |
3655 | |
3656 // (6) Finally, we check whether there are enough completed STAB | |
3657 // buffers available for processing. If there are, we abort. | |
3658 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3659 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3660 if (_cm->verbose_low()) { |
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3661 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3662 _worker_id); |
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3663 } |
342 | 3664 // we do need to process SATB buffers, we'll abort and restart |
3665 // the marking task to do so | |
3666 set_has_aborted(); | |
3667 statsOnly( ++_aborted_satb ); | |
3668 return; | |
3669 } | |
3670 } | |
3671 | |
3672 void CMTask::recalculate_limits() { | |
3673 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3674 _words_scanned_limit = _real_words_scanned_limit; | |
3675 | |
3676 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3677 _refs_reached_limit = _real_refs_reached_limit; | |
3678 } | |
3679 | |
3680 void CMTask::decrease_limits() { | |
3681 // This is called when we believe that we're going to do an infrequent | |
3682 // operation which will increase the per byte scanned cost (i.e. move | |
3683 // entries to/from the global stack). It basically tries to decrease the | |
3684 // scanning limit so that the clock is called earlier. | |
3685 | |
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3686 if (_cm->verbose_medium()) { |
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3687 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3688 } |
342 | 3689 |
3690 _words_scanned_limit = _real_words_scanned_limit - | |
3691 3 * words_scanned_period / 4; | |
3692 _refs_reached_limit = _real_refs_reached_limit - | |
3693 3 * refs_reached_period / 4; | |
3694 } | |
3695 | |
3696 void CMTask::move_entries_to_global_stack() { | |
3697 // local array where we'll store the entries that will be popped | |
3698 // from the local queue | |
3699 oop buffer[global_stack_transfer_size]; | |
3700 | |
3701 int n = 0; | |
3702 oop obj; | |
3703 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3704 buffer[n] = obj; | |
3705 ++n; | |
3706 } | |
3707 | |
3708 if (n > 0) { | |
3709 // we popped at least one entry from the local queue | |
3710 | |
3711 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3712 | |
3713 if (!_cm->mark_stack_push(buffer, n)) { | |
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3714 if (_cm->verbose_low()) { |
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3715 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3716 _worker_id); |
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3717 } |
342 | 3718 set_has_aborted(); |
3719 } else { | |
3720 // the transfer was successful | |
3721 | |
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3722 if (_cm->verbose_medium()) { |
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3723 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3724 _worker_id, n); |
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3725 } |
342 | 3726 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3727 if (tmp_size > _global_max_size) { |
342 | 3728 _global_max_size = tmp_size; |
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3729 } |
342 | 3730 _global_pushes += n ); |
3731 } | |
3732 } | |
3733 | |
3734 // this operation was quite expensive, so decrease the limits | |
3735 decrease_limits(); | |
3736 } | |
3737 | |
3738 void CMTask::get_entries_from_global_stack() { | |
3739 // local array where we'll store the entries that will be popped | |
3740 // from the global stack. | |
3741 oop buffer[global_stack_transfer_size]; | |
3742 int n; | |
3743 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3744 assert(n <= global_stack_transfer_size, |
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3745 "we should not pop more than the given limit"); |
342 | 3746 if (n > 0) { |
3747 // yes, we did actually pop at least one entry | |
3748 | |
3749 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3750 if (_cm->verbose_medium()) { |
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3751 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3752 _worker_id, n); |
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3753 } |
342 | 3754 for (int i = 0; i < n; ++i) { |
3755 bool success = _task_queue->push(buffer[i]); | |
3756 // We only call this when the local queue is empty or under a | |
3757 // given target limit. So, we do not expect this push to fail. | |
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3758 assert(success, "invariant"); |
342 | 3759 } |
3760 | |
3761 statsOnly( int tmp_size = _task_queue->size(); | |
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3762 if (tmp_size > _local_max_size) { |
342 | 3763 _local_max_size = tmp_size; |
3776
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3764 } |
342 | 3765 _local_pushes += n ); |
3766 } | |
3767 | |
3768 // this operation was quite expensive, so decrease the limits | |
3769 decrease_limits(); | |
3770 } | |
3771 | |
3772 void CMTask::drain_local_queue(bool partially) { | |
3776
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3773 if (has_aborted()) return; |
342 | 3774 |
3775 // Decide what the target size is, depending whether we're going to | |
3776 // drain it partially (so that other tasks can steal if they run out | |
3777 // of things to do) or totally (at the very end). | |
3778 size_t target_size; | |
3776
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3779 if (partially) { |
342 | 3780 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
3776
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3781 } else { |
342 | 3782 target_size = 0; |
3776
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3783 } |
342 | 3784 |
3785 if (_task_queue->size() > target_size) { | |
3776
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3786 if (_cm->verbose_high()) { |
17937
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3787 gclog_or_tty->print_cr("[%u] draining local queue, target size = " SIZE_FORMAT, |
6862
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3788 _worker_id, target_size); |
3776
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3789 } |
342 | 3790 |
3791 oop obj; | |
3792 bool ret = _task_queue->pop_local(obj); | |
3793 while (ret) { | |
3794 statsOnly( ++_local_pops ); | |
3795 | |
3776
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3796 if (_cm->verbose_high()) { |
6862
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3797 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
17937
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3798 p2i((void*) obj)); |
3776
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3799 } |
342 | 3800 |
1023
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3801 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3802 assert(!_g1h->is_on_master_free_list( |
2152 | 3803 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3804 |
3805 scan_object(obj); | |
3806 | |
3776
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3807 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3808 ret = false; |
3776
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3809 } else { |
342 | 3810 ret = _task_queue->pop_local(obj); |
3776
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3811 } |
342 | 3812 } |
3813 | |
3776
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3814 if (_cm->verbose_high()) { |
6862
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3815 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3816 _worker_id, _task_queue->size()); |
3776
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3817 } |
342 | 3818 } |
3819 } | |
3820 | |
3821 void CMTask::drain_global_stack(bool partially) { | |
3776
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3822 if (has_aborted()) return; |
342 | 3823 |
3824 // We have a policy to drain the local queue before we attempt to | |
3825 // drain the global stack. | |
1023
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3826 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3827 |
3828 // Decide what the target size is, depending whether we're going to | |
3829 // drain it partially (so that other tasks can steal if they run out | |
3830 // of things to do) or totally (at the very end). Notice that, | |
3831 // because we move entries from the global stack in chunks or | |
3832 // because another task might be doing the same, we might in fact | |
3833 // drop below the target. But, this is not a problem. | |
3834 size_t target_size; | |
3776
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3835 if (partially) { |
342 | 3836 target_size = _cm->partial_mark_stack_size_target(); |
3776
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3837 } else { |
342 | 3838 target_size = 0; |
3776
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3839 } |
342 | 3840 |
3841 if (_cm->mark_stack_size() > target_size) { | |
3776
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3842 if (_cm->verbose_low()) { |
17937
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3843 gclog_or_tty->print_cr("[%u] draining global_stack, target size " SIZE_FORMAT, |
6862
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3844 _worker_id, target_size); |
3776
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3845 } |
342 | 3846 |
3847 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3848 get_entries_from_global_stack(); | |
3849 drain_local_queue(partially); | |
3850 } | |
3851 | |
3776
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3852 if (_cm->verbose_low()) { |
17937
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3853 gclog_or_tty->print_cr("[%u] drained global stack, size = " SIZE_FORMAT, |
6862
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3854 _worker_id, _cm->mark_stack_size()); |
3776
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3855 } |
342 | 3856 } |
3857 } | |
3858 | |
3859 // SATB Queue has several assumptions on whether to call the par or | |
3860 // non-par versions of the methods. this is why some of the code is | |
3861 // replicated. We should really get rid of the single-threaded version | |
3862 // of the code to simplify things. | |
3863 void CMTask::drain_satb_buffers() { | |
3776
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3864 if (has_aborted()) return; |
342 | 3865 |
3866 // We set this so that the regular clock knows that we're in the | |
3867 // middle of draining buffers and doesn't set the abort flag when it | |
3868 // notices that SATB buffers are available for draining. It'd be | |
3869 // very counter productive if it did that. :-) | |
3870 _draining_satb_buffers = true; | |
3871 | |
3872 CMObjectClosure oc(this); | |
3873 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3776
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3874 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6862
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3875 satb_mq_set.set_par_closure(_worker_id, &oc); |
3776
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3876 } else { |
342 | 3877 satb_mq_set.set_closure(&oc); |
3776
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3878 } |
342 | 3879 |
3880 // This keeps claiming and applying the closure to completed buffers | |
3881 // until we run out of buffers or we need to abort. | |
1833
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|
3882 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3883 while (!has_aborted() && |
6862
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3884 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
3776
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|
3885 if (_cm->verbose_medium()) { |
6862
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3886 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
3776
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3887 } |
342 | 3888 statsOnly( ++_satb_buffers_processed ); |
3889 regular_clock_call(); | |
3890 } | |
3891 } else { | |
3892 while (!has_aborted() && | |
3893 satb_mq_set.apply_closure_to_completed_buffer()) { | |
3776
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|
3894 if (_cm->verbose_medium()) { |
6862
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3895 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
3776
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|
3896 } |
342 | 3897 statsOnly( ++_satb_buffers_processed ); |
3898 regular_clock_call(); | |
3899 } | |
3900 } | |
3901 | |
3902 if (!concurrent() && !has_aborted()) { | |
3903 // We should only do this during remark. | |
3776
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|
3904 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6862
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3905 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
3776
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3906 } else { |
342 | 3907 satb_mq_set.iterate_closure_all_threads(); |
3776
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3908 } |
342 | 3909 } |
3910 | |
3911 _draining_satb_buffers = false; | |
3912 | |
1023
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|
3913 assert(has_aborted() || |
11d4857fe5e1
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|
3914 concurrent() || |
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|
3915 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3916 |
3776
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|
3917 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6862
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3918 satb_mq_set.set_par_closure(_worker_id, NULL); |
3776
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3919 } else { |
342 | 3920 satb_mq_set.set_closure(NULL); |
3776
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3921 } |
342 | 3922 |
3923 // again, this was a potentially expensive operation, decrease the | |
3924 // limits to get the regular clock call early | |
3925 decrease_limits(); | |
3926 } | |
3927 | |
3928 void CMTask::print_stats() { | |
6862
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3929 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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3930 _worker_id, _calls); |
342 | 3931 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
3932 _elapsed_time_ms, _termination_time_ms); | |
3933 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3934 _step_times_ms.num(), _step_times_ms.avg(), | |
3935 _step_times_ms.sd()); | |
3936 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3937 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3938 | |
3939 #if _MARKING_STATS_ | |
3940 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3941 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3942 _all_clock_intervals_ms.sd()); | |
3943 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3944 _all_clock_intervals_ms.maximum(), | |
3945 _all_clock_intervals_ms.sum()); | |
3946 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3947 _clock_due_to_scanning, _clock_due_to_marking); | |
3948 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3949 _objs_scanned, _objs_found_on_bitmap); | |
3950 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3951 _local_pushes, _local_pops, _local_max_size); | |
3952 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3953 _global_pushes, _global_pops, _global_max_size); | |
3954 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3955 _global_transfers_to,_global_transfers_from); | |
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3956 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3957 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3958 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3959 _steal_attempts, _steals); | |
3960 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3961 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3962 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3963 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3964 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3965 #endif // _MARKING_STATS_ | |
3966 } | |
3967 | |
3968 /***************************************************************************** | |
3969 | |
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3970 The do_marking_step(time_target_ms, ...) method is the building |
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|
3971 block of the parallel marking framework. It can be called in parallel |
342 | 3972 with other invocations of do_marking_step() on different tasks |
3973 (but only one per task, obviously) and concurrently with the | |
3974 mutator threads, or during remark, hence it eliminates the need | |
3975 for two versions of the code. When called during remark, it will | |
3976 pick up from where the task left off during the concurrent marking | |
3977 phase. Interestingly, tasks are also claimable during evacuation | |
3978 pauses too, since do_marking_step() ensures that it aborts before | |
3979 it needs to yield. | |
3980 | |
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3981 The data structures that it uses to do marking work are the |
342 | 3982 following: |
3983 | |
3984 (1) Marking Bitmap. If there are gray objects that appear only | |
3985 on the bitmap (this happens either when dealing with an overflow | |
3986 or when the initial marking phase has simply marked the roots | |
3987 and didn't push them on the stack), then tasks claim heap | |
3988 regions whose bitmap they then scan to find gray objects. A | |
3989 global finger indicates where the end of the last claimed region | |
3990 is. A local finger indicates how far into the region a task has | |
3991 scanned. The two fingers are used to determine how to gray an | |
3992 object (i.e. whether simply marking it is OK, as it will be | |
3993 visited by a task in the future, or whether it needs to be also | |
3994 pushed on a stack). | |
3995 | |
3996 (2) Local Queue. The local queue of the task which is accessed | |
3997 reasonably efficiently by the task. Other tasks can steal from | |
3998 it when they run out of work. Throughout the marking phase, a | |
3999 task attempts to keep its local queue short but not totally | |
4000 empty, so that entries are available for stealing by other | |
4001 tasks. Only when there is no more work, a task will totally | |
4002 drain its local queue. | |
4003 | |
4004 (3) Global Mark Stack. This handles local queue overflow. During | |
4005 marking only sets of entries are moved between it and the local | |
4006 queues, as access to it requires a mutex and more fine-grain | |
4007 interaction with it which might cause contention. If it | |
4008 overflows, then the marking phase should restart and iterate | |
4009 over the bitmap to identify gray objects. Throughout the marking | |
4010 phase, tasks attempt to keep the global mark stack at a small | |
4011 length but not totally empty, so that entries are available for | |
4012 popping by other tasks. Only when there is no more work, tasks | |
4013 will totally drain the global mark stack. | |
4014 | |
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4015 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 4016 made available. Buffers are regularly removed from this queue |
4017 and scanned for roots, so that the queue doesn't get too | |
4018 long. During remark, all completed buffers are processed, as | |
4019 well as the filled in parts of any uncompleted buffers. | |
4020 | |
4021 The do_marking_step() method tries to abort when the time target | |
4022 has been reached. There are a few other cases when the | |
4023 do_marking_step() method also aborts: | |
4024 | |
4025 (1) When the marking phase has been aborted (after a Full GC). | |
4026 | |
5988
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4027 (2) When a global overflow (on the global stack) has been |
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4028 triggered. Before the task aborts, it will actually sync up with |
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4029 the other tasks to ensure that all the marking data structures |
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4030 (local queues, stacks, fingers etc.) are re-initialized so that |
5988
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4031 when do_marking_step() completes, the marking phase can |
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4032 immediately restart. |
342 | 4033 |
4034 (3) When enough completed SATB buffers are available. The | |
4035 do_marking_step() method only tries to drain SATB buffers right | |
4036 at the beginning. So, if enough buffers are available, the | |
4037 marking step aborts and the SATB buffers are processed at | |
4038 the beginning of the next invocation. | |
4039 | |
4040 (4) To yield. when we have to yield then we abort and yield | |
4041 right at the end of do_marking_step(). This saves us from a lot | |
4042 of hassle as, by yielding we might allow a Full GC. If this | |
4043 happens then objects will be compacted underneath our feet, the | |
4044 heap might shrink, etc. We save checking for this by just | |
4045 aborting and doing the yield right at the end. | |
4046 | |
4047 From the above it follows that the do_marking_step() method should | |
4048 be called in a loop (or, otherwise, regularly) until it completes. | |
4049 | |
4050 If a marking step completes without its has_aborted() flag being | |
4051 true, it means it has completed the current marking phase (and | |
4052 also all other marking tasks have done so and have all synced up). | |
4053 | |
4054 A method called regular_clock_call() is invoked "regularly" (in | |
4055 sub ms intervals) throughout marking. It is this clock method that | |
4056 checks all the abort conditions which were mentioned above and | |
4057 decides when the task should abort. A work-based scheme is used to | |
4058 trigger this clock method: when the number of object words the | |
4059 marking phase has scanned or the number of references the marking | |
4060 phase has visited reach a given limit. Additional invocations to | |
4061 the method clock have been planted in a few other strategic places | |
4062 too. The initial reason for the clock method was to avoid calling | |
4063 vtime too regularly, as it is quite expensive. So, once it was in | |
4064 place, it was natural to piggy-back all the other conditions on it | |
4065 too and not constantly check them throughout the code. | |
4066 | |
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4067 If do_termination is true then do_marking_step will enter its |
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4068 termination protocol. |
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4069 |
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4070 The value of is_serial must be true when do_marking_step is being |
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4071 called serially (i.e. by the VMThread) and do_marking_step should |
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4072 skip any synchronization in the termination and overflow code. |
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|
4073 Examples include the serial remark code and the serial reference |
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|
4074 processing closures. |
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4075 |
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4076 The value of is_serial must be false when do_marking_step is |
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4077 being called by any of the worker threads in a work gang. |
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4078 Examples include the concurrent marking code (CMMarkingTask), |
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|
4079 the MT remark code, and the MT reference processing closures. |
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4080 |
342 | 4081 *****************************************************************************/ |
4082 | |
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4083 void CMTask::do_marking_step(double time_target_ms, |
8787
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4084 bool do_termination, |
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4085 bool is_serial) { |
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4086 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4087 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4088 |
342 | 4089 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
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4090 assert(_task_queues != NULL, "invariant"); |
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4091 assert(_task_queue != NULL, "invariant"); |
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4092 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4093 |
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4094 assert(!_claimed, |
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4095 "only one thread should claim this task at any one time"); |
342 | 4096 |
4097 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4098 // possible for two threads to set the _claimed flag at the same | |
4099 // time. But it is only for debugging purposes anyway and it will | |
4100 // catch most problems. | |
4101 _claimed = true; | |
4102 | |
4103 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4104 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4105 | |
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4106 // If do_stealing is true then do_marking_step will attempt to |
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4107 // steal work from the other CMTasks. It only makes sense to |
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4108 // enable stealing when the termination protocol is enabled |
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4109 // and do_marking_step() is not being called serially. |
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4110 bool do_stealing = do_termination && !is_serial; |
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4111 |
342 | 4112 double diff_prediction_ms = |
4113 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4114 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4115 | |
4116 // set up the variables that are used in the work-based scheme to | |
4117 // call the regular clock method | |
4118 _words_scanned = 0; | |
4119 _refs_reached = 0; | |
4120 recalculate_limits(); | |
4121 | |
4122 // clear all flags | |
4123 clear_has_aborted(); | |
2174
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4124 _has_timed_out = false; |
342 | 4125 _draining_satb_buffers = false; |
4126 | |
4127 ++_calls; | |
4128 | |
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4129 if (_cm->verbose_low()) { |
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4130 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4131 "target = %1.2lfms >>>>>>>>>>", |
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4132 _worker_id, _calls, _time_target_ms); |
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4133 } |
342 | 4134 |
4135 // Set up the bitmap and oop closures. Anything that uses them is | |
4136 // eventually called from this method, so it is OK to allocate these | |
4137 // statically. | |
4138 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4139 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4140 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4141 |
4142 if (_cm->has_overflown()) { | |
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4143 // This can happen if the mark stack overflows during a GC pause |
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4144 // and this task, after a yield point, restarts. We have to abort |
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4145 // as we need to get into the overflow protocol which happens |
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4146 // right at the end of this task. |
342 | 4147 set_has_aborted(); |
4148 } | |
4149 | |
4150 // First drain any available SATB buffers. After this, we will not | |
4151 // look at SATB buffers before the next invocation of this method. | |
4152 // If enough completed SATB buffers are queued up, the regular clock | |
4153 // will abort this task so that it restarts. | |
4154 drain_satb_buffers(); | |
4155 // ...then partially drain the local queue and the global stack | |
4156 drain_local_queue(true); | |
4157 drain_global_stack(true); | |
4158 | |
4159 do { | |
4160 if (!has_aborted() && _curr_region != NULL) { | |
4161 // This means that we're already holding on to a region. | |
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4162 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4163 "should not be NULL either"); |
342 | 4164 |
4165 // We might have restarted this task after an evacuation pause | |
4166 // which might have evacuated the region we're holding on to | |
4167 // underneath our feet. Let's read its limit again to make sure | |
4168 // that we do not iterate over a region of the heap that | |
4169 // contains garbage (update_region_limit() will also move | |
4170 // _finger to the start of the region if it is found empty). | |
4171 update_region_limit(); | |
4172 // We will start from _finger not from the start of the region, | |
4173 // as we might be restarting this task after aborting half-way | |
4174 // through scanning this region. In this case, _finger points to | |
4175 // the address where we last found a marked object. If this is a | |
4176 // fresh region, _finger points to start(). | |
4177 MemRegion mr = MemRegion(_finger, _region_limit); | |
4178 | |
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4179 if (_cm->verbose_low()) { |
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4180 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4181 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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|
4182 "of region "HR_FORMAT, |
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4183 _worker_id, p2i(_finger), p2i(_region_limit), |
8039
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|
4184 HR_FORMAT_PARAMS(_curr_region)); |
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4185 } |
342 | 4186 |
8039
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4187 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
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4188 "humongous regions should go around loop once only"); |
5e401ef52ec0
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4189 |
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4190 // Some special cases: |
5e401ef52ec0
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4191 // If the memory region is empty, we can just give up the region. |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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4192 // If the current region is humongous then we only need to check |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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4193 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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4194 // scan the object if it's live, and give up the region. |
5e401ef52ec0
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4195 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
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4196 // that is left. |
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4197 // If the iteration is successful, give up the region. |
8039
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4198 if (mr.is_empty()) { |
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4199 giveup_current_region(); |
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|
4200 regular_clock_call(); |
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|
4201 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
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4202 if (_nextMarkBitMap->isMarked(mr.start())) { |
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4203 // The object is marked - apply the closure |
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4204 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
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|
4205 bitmap_closure.do_bit(offset); |
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|
4206 } |
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4207 // Even if this task aborted while scanning the humongous object |
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4208 // we can (and should) give up the current region. |
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|
4209 giveup_current_region(); |
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|
4210 regular_clock_call(); |
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4211 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4212 giveup_current_region(); |
4213 regular_clock_call(); | |
4214 } else { | |
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4215 assert(has_aborted(), "currently the only way to do so"); |
342 | 4216 // The only way to abort the bitmap iteration is to return |
4217 // false from the do_bit() method. However, inside the | |
4218 // do_bit() method we move the _finger to point to the | |
4219 // object currently being looked at. So, if we bail out, we | |
4220 // have definitely set _finger to something non-null. | |
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4221 assert(_finger != NULL, "invariant"); |
342 | 4222 |
4223 // Region iteration was actually aborted. So now _finger | |
4224 // points to the address of the object we last scanned. If we | |
4225 // leave it there, when we restart this task, we will rescan | |
4226 // the object. It is easy to avoid this. We move the finger by | |
4227 // enough to point to the next possible object header (the | |
4228 // bitmap knows by how much we need to move it as it knows its | |
4229 // granularity). | |
1314
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4230 assert(_finger < _region_limit, "invariant"); |
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4231 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
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4232 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
4233 if (new_finger >= _region_limit) { |
5988
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|
4234 giveup_current_region(); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4235 } else { |
5988
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|
4236 move_finger_to(new_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4237 } |
342 | 4238 } |
4239 } | |
4240 // At this point we have either completed iterating over the | |
4241 // region we were holding on to, or we have aborted. | |
4242 | |
4243 // We then partially drain the local queue and the global stack. | |
4244 // (Do we really need this?) | |
4245 drain_local_queue(true); | |
4246 drain_global_stack(true); | |
4247 | |
4248 // Read the note on the claim_region() method on why it might | |
4249 // return NULL with potentially more regions available for | |
4250 // claiming and why we have to check out_of_regions() to determine | |
4251 // whether we're done or not. | |
4252 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4253 // We are going to try to claim a new region. We should have | |
4254 // given up on the previous one. | |
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4255 // Separated the asserts so that we know which one fires. |
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|
4256 assert(_curr_region == NULL, "invariant"); |
11d4857fe5e1
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|
4257 assert(_finger == NULL, "invariant"); |
11d4857fe5e1
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|
4258 assert(_region_limit == NULL, "invariant"); |
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|
4259 if (_cm->verbose_low()) { |
6862
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4260 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
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|
4261 } |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4262 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4263 if (claimed_region != NULL) { |
4264 // Yes, we managed to claim one | |
4265 statsOnly( ++_regions_claimed ); | |
4266 | |
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|
4267 if (_cm->verbose_low()) { |
6862
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4268 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4269 "region "PTR_FORMAT, |
17937
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4270 _worker_id, p2i(claimed_region)); |
3776
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|
4271 } |
342 | 4272 |
4273 setup_for_region(claimed_region); | |
1023
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|
4274 assert(_curr_region == claimed_region, "invariant"); |
342 | 4275 } |
4276 // It is important to call the regular clock here. It might take | |
4277 // a while to claim a region if, for example, we hit a large | |
4278 // block of empty regions. So we need to call the regular clock | |
4279 // method once round the loop to make sure it's called | |
4280 // frequently enough. | |
4281 regular_clock_call(); | |
4282 } | |
4283 | |
4284 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
4285 assert(_cm->out_of_regions(), |
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|
4286 "at this point we should be out of regions"); |
342 | 4287 } |
4288 } while ( _curr_region != NULL && !has_aborted()); | |
4289 | |
4290 if (!has_aborted()) { | |
4291 // We cannot check whether the global stack is empty, since other | |
5988
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4292 // tasks might be pushing objects to it concurrently. |
1023
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|
4293 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4294 "at this point we should be out of regions"); |
342 | 4295 |
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|
4296 if (_cm->verbose_low()) { |
6862
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|
4297 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
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|
4298 } |
342 | 4299 |
4300 // Try to reduce the number of available SATB buffers so that | |
4301 // remark has less work to do. | |
4302 drain_satb_buffers(); | |
4303 } | |
4304 | |
4305 // Since we've done everything else, we can now totally drain the | |
4306 // local queue and global stack. | |
4307 drain_local_queue(false); | |
4308 drain_global_stack(false); | |
4309 | |
4310 // Attempt at work stealing from other task's queues. | |
2174
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|
4311 if (do_stealing && !has_aborted()) { |
342 | 4312 // We have not aborted. This means that we have finished all that |
4313 // we could. Let's try to do some stealing... | |
4314 | |
4315 // We cannot check whether the global stack is empty, since other | |
5988
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|
4316 // tasks might be pushing objects to it concurrently. |
1023
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|
4317 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
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|
4318 "only way to reach here"); |
342 | 4319 |
3776
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|
4320 if (_cm->verbose_low()) { |
6862
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|
4321 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
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|
4322 } |
342 | 4323 |
4324 while (!has_aborted()) { | |
4325 oop obj; | |
4326 statsOnly( ++_steal_attempts ); | |
4327 | |
6862
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|
4328 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
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|
4329 if (_cm->verbose_medium()) { |
6862
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|
4330 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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|
4331 _worker_id, p2i((void*) obj)); |
3776
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|
4332 } |
342 | 4333 |
4334 statsOnly( ++_steals ); | |
4335 | |
1023
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|
4336 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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|
4337 "any stolen object should be marked"); |
342 | 4338 scan_object(obj); |
4339 | |
4340 // And since we're towards the end, let's totally drain the | |
4341 // local queue and global stack. | |
4342 drain_local_queue(false); | |
4343 drain_global_stack(false); | |
4344 } else { | |
4345 break; | |
4346 } | |
4347 } | |
4348 } | |
4349 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4350 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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diff
changeset
|
4351 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4352 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4353 if (_cm->force_overflow()->should_force()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4354 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4355 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4356 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4357 } |
cd8e33b2a8ad
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tonyp
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|
4358 |
342 | 4359 // We still haven't aborted. Now, let's try to get into the |
4360 // termination protocol. | |
2174
234761c55641
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|
4361 if (do_termination && !has_aborted()) { |
342 | 4362 // We cannot check whether the global stack is empty, since other |
5988
2a0172480595
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|
4363 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
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tonyp
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diff
changeset
|
4364 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
changeset
|
4365 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
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changeset
|
4366 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4367 |
3776
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|
4368 if (_cm->verbose_low()) { |
6862
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|
4369 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
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|
4370 } |
342 | 4371 |
4372 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
8787
fa08949fe0cb
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|
4373 |
342 | 4374 // The CMTask class also extends the TerminatorTerminator class, |
4375 // hence its should_exit_termination() method will also decide | |
4376 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
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|
4377 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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changeset
|
4378 _cm->terminator()->offer_termination(this)); |
342 | 4379 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4380 _termination_time_ms += | |
4381 termination_end_time_ms - _termination_start_time_ms; | |
4382 | |
4383 if (finished) { | |
4384 // We're all done. | |
4385 | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4386 if (_worker_id == 0) { |
342 | 4387 // let's allow task 0 to do this |
4388 if (concurrent()) { | |
1023
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|
4389 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4390 // we need to set this to false before the next |
4391 // safepoint. This way we ensure that the marking phase | |
4392 // doesn't observe any more heap expansions. | |
4393 _cm->clear_concurrent_marking_in_progress(); | |
4394 } | |
4395 } | |
4396 | |
4397 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
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diff
changeset
|
4398 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
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diff
changeset
|
4399 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
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|
4400 // which one. |
11d4857fe5e1
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|
4401 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
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|
4402 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
4403 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
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|
4404 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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|
4405 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4406 |
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|
4407 if (_cm->verbose_low()) { |
6862
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|
4408 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
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|
4409 } |
342 | 4410 } else { |
4411 // Apparently there's more work to do. Let's abort this task. It | |
4412 // will restart it and we can hopefully find more things to do. | |
4413 | |
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|
4414 if (_cm->verbose_low()) { |
6862
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changeset
|
4415 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
8a5ea0a9ccc4
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|
4416 _worker_id); |
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|
4417 } |
342 | 4418 |
4419 set_has_aborted(); | |
4420 statsOnly( ++_aborted_termination ); | |
4421 } | |
4422 } | |
4423 | |
4424 // Mainly for debugging purposes to make sure that a pointer to the | |
4425 // closure which was statically allocated in this frame doesn't | |
4426 // escape it by accident. | |
3771 | 4427 set_cm_oop_closure(NULL); |
342 | 4428 double end_time_ms = os::elapsedVTime() * 1000.0; |
4429 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4430 // Update the step history. | |
4431 _step_times_ms.add(elapsed_time_ms); | |
4432 | |
4433 if (has_aborted()) { | |
4434 // The task was aborted for some reason. | |
4435 | |
4436 statsOnly( ++_aborted ); | |
4437 | |
2174
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|
4438 if (_has_timed_out) { |
342 | 4439 double diff_ms = elapsed_time_ms - _time_target_ms; |
4440 // Keep statistics of how well we did with respect to hitting | |
4441 // our target only if we actually timed out (if we aborted for | |
4442 // other reasons, then the results might get skewed). | |
4443 _marking_step_diffs_ms.add(diff_ms); | |
4444 } | |
4445 | |
4446 if (_cm->has_overflown()) { | |
4447 // This is the interesting one. We aborted because a global | |
4448 // overflow was raised. This means we have to restart the | |
4449 // marking phase and start iterating over regions. However, in | |
4450 // order to do this we have to make sure that all tasks stop | |
4451 // what they are doing and re-initialise in a safe manner. We | |
4452 // will achieve this with the use of two barrier sync points. | |
4453 | |
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|
4454 if (_cm->verbose_low()) { |
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|
4455 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
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|
4456 } |
342 | 4457 |
8787
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|
4458 if (!is_serial) { |
fa08949fe0cb
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|
4459 // We only need to enter the sync barrier if being called |
fa08949fe0cb
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|
4460 // from a parallel context |
fa08949fe0cb
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|
4461 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
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|
4462 |
fa08949fe0cb
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changeset
|
4463 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
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changeset
|
4464 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
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changeset
|
4465 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
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changeset
|
4466 // task 0 will clear the global data structures. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4467 } |
342 | 4468 |
4469 statsOnly( ++_aborted_overflow ); | |
4470 | |
4471 // We clear the local state of this task... | |
4472 clear_region_fields(); | |
4473 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4474 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4475 // ...and enter the second barrier. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4476 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4477 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4478 // At this point, if we're during the concurrent phase of |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4479 // marking, everything has been re-initialized and we're |
342 | 4480 // ready to restart. |
4481 } | |
4482 | |
4483 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4484 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4485 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4486 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4487 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4488 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
|
4489 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4490 } |
342 | 4491 } |
4492 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4493 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4494 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4495 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4496 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4497 } |
342 | 4498 } |
4499 | |
4500 _claimed = false; | |
4501 } | |
4502 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4503 CMTask::CMTask(uint worker_id, |
342 | 4504 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4505 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4506 BitMap* card_bm, |
342 | 4507 CMTaskQueue* task_queue, |
4508 CMTaskQueueSet* task_queues) | |
4509 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4510 _worker_id(worker_id), _cm(cm), |
342 | 4511 _claimed(false), |
4512 _nextMarkBitMap(NULL), _hash_seed(17), | |
4513 _task_queue(task_queue), | |
4514 _task_queues(task_queues), | |
3771 | 4515 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4516 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4517 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4518 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4519 guarantee(task_queues != NULL, "invariant"); |
342 | 4520 |
4521 statsOnly( _clock_due_to_scanning = 0; | |
4522 _clock_due_to_marking = 0 ); | |
4523 | |
4524 _marking_step_diffs_ms.add(0.5); | |
4525 } | |
2435
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 // 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
|
4528 // 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
|
4529 // 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
|
4530 // 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
|
4531 // 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
|
4532 // 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
|
4533 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4534 // 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
|
4535 // 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
|
4536 #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
|
4537 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4538 #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
|
4539 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4540 #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
|
4541 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4542 #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
|
4543 #endif // _LP64 |
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 // 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
|
4546 #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
|
4547 #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
|
4548 #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
|
4549 #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
|
4550 #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
|
4551 #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
|
4552 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4553 // 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
|
4554 #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
|
4555 #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
|
4556 #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
|
4557 #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
|
4558 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4559 G1PrintRegionLivenessInfoClosure:: |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4560 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
|
4561 : _out(out), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4562 _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
|
4563 _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
|
4564 _hum_used_bytes(0), _hum_capacity_bytes(0), |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4565 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
12080 | 4566 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4567 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
|
4568 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
|
4569 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
|
4570 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
|
4571 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4572 // 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
|
4573 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4574 _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
|
4575 _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
|
4576 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
|
4577 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
|
4578 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4579 p2i(g1_committed.start()), p2i(g1_committed.end()), |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4580 p2i(g1_reserved.start()), p2i(g1_reserved.end()), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4581 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
|
4582 _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
|
4583 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4584 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4585 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4586 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4587 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4588 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4589 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4590 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4591 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4592 "type", "address-range", |
12080 | 4593 "used", "prev-live", "next-live", "gc-eff", |
4594 "remset", "code-roots"); | |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4595 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4596 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4597 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4598 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4599 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4600 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4601 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4602 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4603 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4604 "", "", |
12080 | 4605 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
4606 "(bytes)", "(bytes)"); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4607 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4608 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4609 // 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
|
4610 // 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
|
4611 // 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
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2369
diff
changeset
|
4612 // 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
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2369
diff
changeset
|
4613 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
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2369
diff
changeset
|
4614 size_t bytes = 0; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4615 // The > 0 check is to deal with the prev and next live bytes which |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
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|
4616 // 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
|
4617 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4618 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
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2369
diff
changeset
|
4619 *hum_bytes -= bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4620 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4621 return bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4622 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4623 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4624 // 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
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2369
diff
changeset
|
4625 // 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
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2369
diff
changeset
|
4626 // 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
|
4627 // 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:
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diff
changeset
|
4628 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4629 size_t* capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4630 size_t* prev_live_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4631 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
|
4632 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:
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diff
changeset
|
4633 *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
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parents:
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diff
changeset
|
4634 *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
|
4635 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4636 *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
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parents:
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diff
changeset
|
4637 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4638 |
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
|
4639 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
|
4640 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
|
4641 HeapWord* bottom = r->bottom(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4642 HeapWord* end = r->end(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4643 size_t capacity_bytes = r->capacity(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4644 size_t used_bytes = r->used(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4645 size_t prev_live_bytes = r->live_bytes(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4646 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:
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diff
changeset
|
4647 double gc_eff = r->gc_efficiency(); |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4648 size_t remset_bytes = r->rem_set()->mem_size(); |
12080 | 4649 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
4650 | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4651 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
|
4652 type = "FREE"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4653 } 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
|
4654 type = "SURV"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4655 } 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
|
4656 type = "EDEN"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4657 } 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
|
4658 type = "HUMS"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4659 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4660 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
|
4661 _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
|
4662 "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
|
4663 // 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
|
4664 _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
|
4665 _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
|
4666 _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
|
4667 _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
|
4668 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
|
4669 &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
|
4670 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
|
4671 } 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
|
4672 type = "HUMC"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4673 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
|
4674 &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
|
4675 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
|
4676 } else { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4677 type = "OLD"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4678 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4679 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4680 _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
|
4681 _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
|
4682 _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
|
4683 _total_next_live_bytes += next_live_bytes; |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4684 _total_remset_bytes += remset_bytes; |
12080 | 4685 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4686 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4687 // 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
|
4688 _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
|
4689 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
|
4690 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
|
4691 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
|
4692 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
|
4693 G1PPRL_BYTE_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4694 G1PPRL_DOUBLE_FORMAT |
12080 | 4695 G1PPRL_BYTE_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4696 G1PPRL_BYTE_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4697 type, p2i(bottom), p2i(end), |
12080 | 4698 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
4699 remset_bytes, strong_code_roots_bytes); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4700 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4701 return false; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4702 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4703 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4704 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4705 // add static memory usages to remembered set sizes |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4706 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4707 // 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
|
4708 _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
|
4709 _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
|
4710 " SUMMARY" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4711 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
|
4712 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
|
4713 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4714 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
12080 | 4715 G1PPRL_SUM_MB_FORMAT("remset") |
4716 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4717 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
|
4718 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
|
4719 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
|
4720 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
|
4721 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
|
4722 bytes_to_mb(_total_next_live_bytes), |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4723 perc(_total_next_live_bytes, _total_capacity_bytes), |
12080 | 4724 bytes_to_mb(_total_remset_bytes), |
4725 bytes_to_mb(_total_strong_code_roots_bytes)); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4726 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4727 } |