Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 17567:5656140324ed
8030763: Validate global memory allocation
Summary: Add length checks where necessary
Reviewed-by: coleenp, mschoene
author | hseigel |
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date | Thu, 13 Feb 2014 11:28:17 -0500 |
parents | 1de8e5356754 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
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 | |
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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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484 _markBitMap1(log2_intptr(MinObjAlignment)), |
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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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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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diff
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512 _has_aborted(false), |
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470
diff
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513 _restart_for_overflow(false), |
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514 _concurrent_marking_in_progress(false), |
342 | 515 |
516 // _verbose_level set below | |
517 | |
518 _init_times(), | |
519 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
520 _cleanup_times(), | |
521 _total_counting_time(0.0), | |
522 _total_rs_scrub_time(0.0), | |
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523 |
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524 _parallel_workers(NULL), |
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525 |
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526 _count_card_bitmaps(NULL), |
7397
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527 _count_marked_bytes(NULL), |
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528 _completed_initialization(false) { |
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529 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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530 if (verbose_level < no_verbose) { |
342 | 531 verbose_level = no_verbose; |
3776
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532 } |
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|
533 if (verbose_level > high_verbose) { |
342 | 534 verbose_level = high_verbose; |
3776
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|
535 } |
342 | 536 _verbose_level = verbose_level; |
537 | |
3776
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538 if (verbose_low()) { |
342 | 539 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
540 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
3776
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541 } |
342 | 542 |
7397
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543 if (!_markBitMap1.allocate(heap_rs)) { |
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544 warning("Failed to allocate first CM bit map"); |
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545 return; |
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|
546 } |
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547 if (!_markBitMap2.allocate(heap_rs)) { |
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548 warning("Failed to allocate second CM bit map"); |
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549 return; |
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550 } |
342 | 551 |
552 // Create & start a ConcurrentMark thread. | |
845
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553 _cmThread = new ConcurrentMarkThread(this); |
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554 assert(cmThread() != NULL, "CM Thread should have been created"); |
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555 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
13437
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556 if (_cmThread->osthread() == NULL) { |
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557 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
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558 } |
845
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559 |
342 | 560 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
7397
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561 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
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562 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 563 |
564 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 565 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 566 |
4837
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567 _root_regions.init(_g1h, this); |
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568 |
1284 | 569 if (ConcGCThreads > ParallelGCThreads) { |
7397
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570 warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") " |
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571 "than ParallelGCThreads (" UINT32_FORMAT ").", |
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572 ConcGCThreads, ParallelGCThreads); |
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573 return; |
342 | 574 } |
575 if (ParallelGCThreads == 0) { | |
576 // if we are not running with any parallel GC threads we will not | |
577 // spawn any marking threads either | |
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578 _parallel_marking_threads = 0; |
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579 _max_parallel_marking_threads = 0; |
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580 _sleep_factor = 0.0; |
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581 _marking_task_overhead = 1.0; |
342 | 582 } else { |
8006
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8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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583 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
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584 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 585 // if both are set |
586 _sleep_factor = 0.0; | |
587 _marking_task_overhead = 1.0; | |
751 | 588 } else if (G1MarkingOverheadPercent > 0) { |
8006
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589 // We will calculate the number of parallel marking threads based |
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590 // on a target overhead with respect to the soft real-time goal |
751 | 591 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 592 double overall_cm_overhead = |
751 | 593 (double) MaxGCPauseMillis * marking_overhead / |
594 (double) GCPauseIntervalMillis; | |
342 | 595 double cpu_ratio = 1.0 / (double) os::processor_count(); |
596 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
597 double marking_task_overhead = | |
598 overall_cm_overhead / marking_thread_num * | |
599 (double) os::processor_count(); | |
600 double sleep_factor = | |
601 (1.0 - marking_task_overhead) / marking_task_overhead; | |
602 | |
8006
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|
603 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 604 _sleep_factor = sleep_factor; |
605 _marking_task_overhead = marking_task_overhead; | |
606 } else { | |
8006
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607 // Calculate the number of parallel marking threads by scaling |
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608 // the number of parallel GC threads. |
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609 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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610 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 611 _sleep_factor = 0.0; |
612 _marking_task_overhead = 1.0; | |
613 } | |
614 | |
8006
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615 assert(ConcGCThreads > 0, "Should have been set"); |
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616 _parallel_marking_threads = (uint) ConcGCThreads; |
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617 _max_parallel_marking_threads = _parallel_marking_threads; |
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618 |
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619 if (parallel_marking_threads() > 1) { |
342 | 620 _cleanup_task_overhead = 1.0; |
3776
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621 } else { |
342 | 622 _cleanup_task_overhead = marking_task_overhead(); |
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623 } |
342 | 624 _cleanup_sleep_factor = |
625 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
626 | |
627 #if 0 | |
628 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
629 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
630 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
631 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
632 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
633 #endif | |
634 | |
1023
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635 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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636 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
4728
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637 _max_parallel_marking_threads, false, true); |
1833
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638 if (_parallel_workers == NULL) { |
342 | 639 vm_exit_during_initialization("Failed necessary allocation."); |
1833
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640 } else { |
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641 _parallel_workers->initialize_workers(); |
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642 } |
342 | 643 } |
644 | |
7397
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645 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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646 uintx mark_stack_size = |
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647 MIN2(MarkStackSizeMax, |
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648 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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649 // Verify that the calculated value for MarkStackSize is in range. |
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650 // It would be nice to use the private utility routine from Arguments. |
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651 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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652 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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653 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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654 mark_stack_size, 1, MarkStackSizeMax); |
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655 return; |
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656 } |
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657 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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658 } else { |
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659 // Verify MarkStackSize is in range. |
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660 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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661 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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662 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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663 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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664 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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665 MarkStackSize, 1, MarkStackSizeMax); |
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666 return; |
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667 } |
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668 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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669 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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670 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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671 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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672 MarkStackSize, MarkStackSizeMax); |
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673 return; |
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674 } |
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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 if (!_markStack.allocate(MarkStackSize)) { |
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680 warning("Failed to allocate CM marking stack"); |
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681 return; |
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682 } |
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683 |
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684 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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685 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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686 |
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687 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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688 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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689 |
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690 BitMap::idx_t card_bm_size = _card_bm.size(); |
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|
691 |
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692 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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693 _active_tasks = _max_worker_id; |
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|
694 |
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695 size_t max_regions = (size_t) _g1h->max_regions(); |
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696 for (uint i = 0; i < _max_worker_id; ++i) { |
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697 CMTaskQueue* task_queue = new CMTaskQueue(); |
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698 task_queue->initialize(); |
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699 _task_queues->register_queue(i, task_queue); |
442f942757c0
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700 |
442f942757c0
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|
701 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
442f942757c0
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702 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
442f942757c0
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|
703 |
442f942757c0
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704 _tasks[i] = new CMTask(i, this, |
442f942757c0
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|
705 _count_marked_bytes[i], |
442f942757c0
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|
706 &_count_card_bitmaps[i], |
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707 task_queue, _task_queues); |
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|
708 |
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709 _accum_task_vtime[i] = 0.0; |
442f942757c0
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|
710 } |
442f942757c0
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|
711 |
442f942757c0
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712 // Calculate the card number for the bottom of the heap. Used |
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713 // in biasing indexes into the accounting card bitmaps. |
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|
714 _heap_bottom_card_num = |
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715 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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716 CardTableModRefBS::card_shift); |
442f942757c0
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|
717 |
442f942757c0
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|
718 // Clear all the liveness counting data |
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|
719 clear_all_count_data(); |
442f942757c0
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720 |
342 | 721 // so that the call below can read a sensible value |
7397
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722 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 723 set_non_marking_state(); |
7397
442f942757c0
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|
724 _completed_initialization = true; |
342 | 725 } |
726 | |
727 void ConcurrentMark::update_g1_committed(bool force) { | |
728 // If concurrent marking is not in progress, then we do not need to | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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diff
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|
729 // update _heap_end. |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
730 if (!concurrent_marking_in_progress() && !force) return; |
342 | 731 |
732 MemRegion committed = _g1h->g1_committed(); | |
1023
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|
733 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 734 HeapWord* new_end = committed.end(); |
735 if (new_end > _heap_end) { | |
736 // The heap has been expanded. | |
737 | |
738 _heap_end = new_end; | |
739 } | |
740 // Notice that the heap can also shrink. However, this only happens | |
741 // during a Full GC (at least currently) and the entire marking | |
742 // phase will bail out and the task will not be restarted. So, let's | |
743 // do nothing. | |
744 } | |
745 | |
746 void ConcurrentMark::reset() { | |
747 // Starting values for these two. This should be called in a STW | |
748 // phase. CM will be notified of any future g1_committed expansions | |
749 // will be at the end of evacuation pauses, when tasks are | |
750 // inactive. | |
751 MemRegion committed = _g1h->g1_committed(); | |
752 _heap_start = committed.start(); | |
753 _heap_end = committed.end(); | |
754 | |
1023
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755 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
756 assert(_heap_start != NULL, "heap bounds should look ok"); |
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|
757 assert(_heap_end != NULL, "heap bounds should look ok"); |
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|
758 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 759 |
7450
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8004816: G1: Kitchensink failures after marking stack changes
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760 // Reset all the marking data structures and any necessary flags |
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761 reset_marking_state(); |
342 | 762 |
3776
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|
763 if (verbose_low()) { |
342 | 764 gclog_or_tty->print_cr("[global] resetting"); |
3776
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765 } |
342 | 766 |
767 // We do reset all of them, since different phases will use | |
768 // different number of active threads. So, it's easiest to have all | |
769 // of them ready. | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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770 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 771 _tasks[i]->reset(_nextMarkBitMap); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
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|
772 } |
342 | 773 |
774 // we need this to make sure that the flag is on during the evac | |
775 // pause with initial mark piggy-backed | |
776 set_concurrent_marking_in_progress(); | |
777 } | |
778 | |
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779 |
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780 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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781 _markStack.set_should_expand(); |
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782 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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783 if (clear_overflow) { |
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784 clear_has_overflown(); |
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785 } else { |
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786 assert(has_overflown(), "pre-condition"); |
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787 } |
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788 _finger = _heap_start; |
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789 |
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790 for (uint i = 0; i < _max_worker_id; ++i) { |
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791 CMTaskQueue* queue = _task_queues->queue(i); |
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792 queue->set_empty(); |
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793 } |
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794 } |
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795 |
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796 void ConcurrentMark::set_concurrency(uint active_tasks) { |
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797 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 798 |
799 _active_tasks = active_tasks; | |
800 // Need to update the three data structures below according to the | |
801 // number of active threads for this phase. | |
802 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
803 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
804 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
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805 } |
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806 |
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807 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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808 set_concurrency(active_tasks); |
342 | 809 |
810 _concurrent = concurrent; | |
811 // We propagate this to all tasks, not just the active ones. | |
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812 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 813 _tasks[i]->set_concurrent(concurrent); |
814 | |
815 if (concurrent) { | |
816 set_concurrent_marking_in_progress(); | |
817 } else { | |
818 // We currently assume that the concurrent flag has been set to | |
819 // false before we start remark. At this point we should also be | |
820 // in a STW phase. | |
1023
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821 assert(!concurrent_marking_in_progress(), "invariant"); |
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822 assert(_finger == _heap_end, |
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823 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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824 _finger, _heap_end)); |
342 | 825 update_g1_committed(true); |
826 } | |
827 } | |
828 | |
829 void ConcurrentMark::set_non_marking_state() { | |
830 // We set the global marking state to some default values when we're | |
831 // not doing marking. | |
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832 reset_marking_state(); |
342 | 833 _active_tasks = 0; |
834 clear_concurrent_marking_in_progress(); | |
835 } | |
836 | |
837 ConcurrentMark::~ConcurrentMark() { | |
4735 | 838 // The ConcurrentMark instance is never freed. |
839 ShouldNotReachHere(); | |
342 | 840 } |
841 | |
842 void ConcurrentMark::clearNextBitmap() { | |
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843 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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844 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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845 |
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846 // Make sure that the concurrent mark thread looks to still be in |
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847 // the current cycle. |
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848 guarantee(cmThread()->during_cycle(), "invariant"); |
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849 |
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850 // We are finishing up the current cycle by clearing the next |
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851 // marking bitmap and getting it ready for the next cycle. During |
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852 // this time no other cycle can start. So, let's make sure that this |
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853 // is the case. |
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854 guarantee(!g1h->mark_in_progress(), "invariant"); |
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855 |
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856 // clear the mark bitmap (no grey objects to start with). |
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857 // We need to do this in chunks and offer to yield in between |
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858 // each chunk. |
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859 HeapWord* start = _nextMarkBitMap->startWord(); |
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860 HeapWord* end = _nextMarkBitMap->endWord(); |
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861 HeapWord* cur = start; |
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862 size_t chunkSize = M; |
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863 while (cur < end) { |
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864 HeapWord* next = cur + chunkSize; |
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865 if (next > end) { |
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866 next = end; |
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867 } |
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868 MemRegion mr(cur,next); |
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869 _nextMarkBitMap->clearRange(mr); |
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870 cur = next; |
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871 do_yield_check(); |
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872 |
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873 // Repeat the asserts from above. We'll do them as asserts here to |
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874 // minimize their overhead on the product. However, we'll have |
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875 // them as guarantees at the beginning / end of the bitmap |
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876 // clearing to get some checking in the product. |
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877 assert(cmThread()->during_cycle(), "invariant"); |
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878 assert(!g1h->mark_in_progress(), "invariant"); |
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879 } |
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880 |
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881 // Clear the liveness counting data |
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882 clear_all_count_data(); |
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883 |
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884 // Repeat the asserts from above. |
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885 guarantee(cmThread()->during_cycle(), "invariant"); |
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886 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 887 } |
888 | |
889 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
890 public: | |
891 bool doHeapRegion(HeapRegion* r) { | |
892 if (!r->continuesHumongous()) { | |
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893 r->note_start_of_marking(); |
342 | 894 } |
895 return false; | |
896 } | |
897 }; | |
898 | |
899 void ConcurrentMark::checkpointRootsInitialPre() { | |
900 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
901 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
902 | |
903 _has_aborted = false; | |
904 | |
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905 #ifndef PRODUCT |
1044 | 906 if (G1PrintReachableAtInitialMark) { |
1388 | 907 print_reachable("at-cycle-start", |
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908 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 909 } |
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910 #endif |
342 | 911 |
912 // Initialise marking structures. This has to be done in a STW phase. | |
913 reset(); | |
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914 |
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915 // For each region note start of marking. |
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916 NoteStartOfMarkHRClosure startcl; |
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917 g1h->heap_region_iterate(&startcl); |
342 | 918 } |
919 | |
920 | |
921 void ConcurrentMark::checkpointRootsInitialPost() { | |
922 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
923 | |
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924 // If we force an overflow during remark, the remark operation will |
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925 // actually abort and we'll restart concurrent marking. If we always |
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926 // force an oveflow during remark we'll never actually complete the |
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927 // marking phase. So, we initilize this here, at the start of the |
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928 // cycle, so that at the remaining overflow number will decrease at |
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929 // every remark and we'll eventually not need to cause one. |
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930 force_overflow_stw()->init(); |
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931 |
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932 // Start Concurrent Marking weak-reference discovery. |
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933 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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934 // enable ("weak") refs discovery |
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935 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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936 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 937 |
938 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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939 // This is the start of the marking cycle, we're expected all |
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940 // threads to have SATB queues with active set to false. |
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941 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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942 false /* expected_active */); |
342 | 943 |
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944 _root_regions.prepare_for_scan(); |
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945 |
342 | 946 // update_g1_committed() will be called at the end of an evac pause |
947 // when marking is on. So, it's also called at the end of the | |
948 // initial-mark pause to update the heap end, if the heap expands | |
949 // during it. No need to call it here. | |
950 } | |
951 | |
952 /* | |
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953 * Notice that in the next two methods, we actually leave the STS |
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954 * during the barrier sync and join it immediately afterwards. If we |
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955 * do not do this, the following deadlock can occur: one thread could |
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956 * be in the barrier sync code, waiting for the other thread to also |
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957 * sync up, whereas another one could be trying to yield, while also |
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958 * waiting for the other threads to sync up too. |
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959 * |
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960 * Note, however, that this code is also used during remark and in |
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961 * this case we should not attempt to leave / enter the STS, otherwise |
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962 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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963 * (product). So we should only leave / enter the STS if we are |
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964 * operating concurrently. |
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965 * |
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966 * Because the thread that does the sync barrier has left the STS, it |
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967 * is possible to be suspended for a Full GC or an evacuation pause |
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968 * could occur. This is actually safe, since the entering the sync |
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969 * barrier is one of the last things do_marking_step() does, and it |
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970 * doesn't manipulate any data structures afterwards. |
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971 */ |
342 | 972 |
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973 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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974 if (verbose_low()) { |
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975 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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976 } |
342 | 977 |
3316
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978 if (concurrent()) { |
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979 ConcurrentGCThread::stsLeave(); |
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980 } |
342 | 981 _first_overflow_barrier_sync.enter(); |
3316
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982 if (concurrent()) { |
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983 ConcurrentGCThread::stsJoin(); |
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984 } |
342 | 985 // at this point everyone should have synced up and not be doing any |
986 // more work | |
987 | |
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988 if (verbose_low()) { |
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989 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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990 } |
342 | 991 |
8788
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992 // If we're executing the concurrent phase of marking, reset the marking |
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993 // state; otherwise the marking state is reset after reference processing, |
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994 // during the remark pause. |
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995 // If we reset here as a result of an overflow during the remark we will |
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996 // see assertion failures from any subsequent set_concurrency_and_phase() |
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997 // calls. |
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998 if (concurrent()) { |
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999 // let the task associated with with worker 0 do this |
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1000 if (worker_id == 0) { |
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1001 // task 0 is responsible for clearing the global data structures |
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1002 // We should be here because of an overflow. During STW we should |
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1003 // not clear the overflow flag since we rely on it being true when |
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1004 // we exit this method to abort the pause and restart concurent |
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1005 // marking. |
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1006 reset_marking_state(true /* clear_overflow */); |
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1007 force_overflow()->update(); |
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1008 |
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1009 if (G1Log::fine()) { |
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1010 gclog_or_tty->date_stamp(PrintGCDateStamps); |
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1011 gclog_or_tty->stamp(PrintGCTimeStamps); |
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1012 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1013 } |
342 | 1014 } |
1015 } | |
1016 | |
1017 // after this, each task should reset its own data structures then | |
1018 // then go into the second barrier | |
1019 } | |
1020 | |
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1021 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1022 if (verbose_low()) { |
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1023 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1024 } |
342 | 1025 |
3316
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1026 if (concurrent()) { |
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1027 ConcurrentGCThread::stsLeave(); |
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1028 } |
342 | 1029 _second_overflow_barrier_sync.enter(); |
3316
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1030 if (concurrent()) { |
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1031 ConcurrentGCThread::stsJoin(); |
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1032 } |
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1033 // at this point everything should be re-initialized and ready to go |
342 | 1034 |
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1035 if (verbose_low()) { |
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1036 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1037 } |
342 | 1038 } |
1039 | |
3316
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1040 #ifndef PRODUCT |
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1041 void ForceOverflowSettings::init() { |
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1042 _num_remaining = G1ConcMarkForceOverflow; |
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1043 _force = false; |
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1044 update(); |
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1045 } |
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1046 |
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1047 void ForceOverflowSettings::update() { |
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1048 if (_num_remaining > 0) { |
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1049 _num_remaining -= 1; |
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1050 _force = true; |
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1051 } else { |
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1052 _force = false; |
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1053 } |
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1054 } |
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1055 |
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1056 bool ForceOverflowSettings::should_force() { |
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1057 if (_force) { |
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1058 _force = false; |
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1059 return true; |
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1060 } else { |
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1061 return false; |
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1062 } |
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1063 } |
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1064 #endif // !PRODUCT |
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1065 |
342 | 1066 class CMConcurrentMarkingTask: public AbstractGangTask { |
1067 private: | |
1068 ConcurrentMark* _cm; | |
1069 ConcurrentMarkThread* _cmt; | |
1070 | |
1071 public: | |
4728
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1072 void work(uint worker_id) { |
1023
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1073 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1074 "this should only be done by a conc GC thread"); |
1974
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1075 ResourceMark rm; |
342 | 1076 |
1077 double start_vtime = os::elapsedVTime(); | |
1078 | |
1079 ConcurrentGCThread::stsJoin(); | |
1080 | |
4728
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1081 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1082 CMTask* the_task = _cm->task(worker_id); |
342 | 1083 the_task->record_start_time(); |
1084 if (!_cm->has_aborted()) { | |
1085 do { | |
1086 double start_vtime_sec = os::elapsedVTime(); | |
1087 double start_time_sec = os::elapsedTime(); | |
2174
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1088 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1089 |
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1090 the_task->do_marking_step(mark_step_duration_ms, |
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1091 true /* do_termination */, |
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1092 false /* is_serial*/); |
2174
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1093 |
342 | 1094 double end_time_sec = os::elapsedTime(); |
1095 double end_vtime_sec = os::elapsedVTime(); | |
1096 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1097 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1098 _cm->clear_has_overflown(); | |
1099 | |
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1100 bool ret = _cm->do_yield_check(worker_id); |
342 | 1101 |
1102 jlong sleep_time_ms; | |
1103 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1104 sleep_time_ms = | |
1105 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1106 ConcurrentGCThread::stsLeave(); | |
1107 os::sleep(Thread::current(), sleep_time_ms, false); | |
1108 ConcurrentGCThread::stsJoin(); | |
1109 } | |
1110 double end_time2_sec = os::elapsedTime(); | |
1111 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1112 | |
1113 #if 0 | |
1114 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1115 "overhead %1.4lf", | |
1116 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1117 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1118 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1119 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1120 #endif | |
1121 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1122 } | |
1123 the_task->record_end_time(); | |
1023
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1124 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1125 |
1126 ConcurrentGCThread::stsLeave(); | |
1127 | |
1128 double end_vtime = os::elapsedVTime(); | |
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1129 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1130 } |
1131 | |
1132 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1133 ConcurrentMarkThread* cmt) : | |
1134 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1135 | |
1136 ~CMConcurrentMarkingTask() { } | |
1137 }; | |
1138 | |
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1139 // Calculates the number of active workers for a concurrent |
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1140 // phase. |
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1141 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1142 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1143 uint n_conc_workers = 0; |
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1144 if (!UseDynamicNumberOfGCThreads || |
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1145 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1146 !ForceDynamicNumberOfGCThreads)) { |
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1147 n_conc_workers = max_parallel_marking_threads(); |
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1148 } else { |
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1149 n_conc_workers = |
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1150 AdaptiveSizePolicy::calc_default_active_workers( |
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1151 max_parallel_marking_threads(), |
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1152 1, /* Minimum workers */ |
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1153 parallel_marking_threads(), |
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1154 Threads::number_of_non_daemon_threads()); |
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1155 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1156 // that scaling has already gone into "_max_parallel_marking_threads". |
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1157 } |
4711 | 1158 assert(n_conc_workers > 0, "Always need at least 1"); |
1159 return n_conc_workers; | |
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1160 } |
4711 | 1161 // If we are not running with any parallel GC threads we will not |
1162 // have spawned any marking threads either. Hence the number of | |
1163 // concurrent workers should be 0. | |
1164 return 0; | |
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1165 } |
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1166 |
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1167 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1168 // Currently, only survivors can be root regions. |
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1169 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1170 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1171 |
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1172 const uintx interval = PrefetchScanIntervalInBytes; |
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1173 HeapWord* curr = hr->bottom(); |
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1174 const HeapWord* end = hr->top(); |
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1175 while (curr < end) { |
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1176 Prefetch::read(curr, interval); |
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1177 oop obj = oop(curr); |
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1178 int size = obj->oop_iterate(&cl); |
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1179 assert(size == obj->size(), "sanity"); |
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1180 curr += size; |
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1181 } |
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1182 } |
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1183 |
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1184 class CMRootRegionScanTask : public AbstractGangTask { |
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1185 private: |
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1186 ConcurrentMark* _cm; |
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1187 |
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1188 public: |
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1189 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1190 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1191 |
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1192 void work(uint worker_id) { |
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1193 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1194 "this should only be done by a conc GC thread"); |
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1195 |
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1196 CMRootRegions* root_regions = _cm->root_regions(); |
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1197 HeapRegion* hr = root_regions->claim_next(); |
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1198 while (hr != NULL) { |
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1199 _cm->scanRootRegion(hr, worker_id); |
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1200 hr = root_regions->claim_next(); |
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1201 } |
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1202 } |
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1203 }; |
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1204 |
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1205 void ConcurrentMark::scanRootRegions() { |
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1206 // scan_in_progress() will have been set to true only if there was |
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1207 // at least one root region to scan. So, if it's false, we |
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1208 // should not attempt to do any further work. |
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1209 if (root_regions()->scan_in_progress()) { |
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1210 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1211 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1212 "Maximum number of marking threads exceeded"); |
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1213 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1214 |
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1215 CMRootRegionScanTask task(this); |
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1216 if (use_parallel_marking_threads()) { |
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1217 _parallel_workers->set_active_workers((int) active_workers); |
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1218 _parallel_workers->run_task(&task); |
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1219 } else { |
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1220 task.work(0); |
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1221 } |
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1222 |
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1223 // It's possible that has_aborted() is true here without actually |
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1224 // aborting the survivor scan earlier. This is OK as it's |
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1225 // mainly used for sanity checking. |
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1226 root_regions()->scan_finished(); |
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1227 } |
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1228 } |
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1229 |
342 | 1230 void ConcurrentMark::markFromRoots() { |
1231 // we might be tempted to assert that: | |
1232 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1233 // "inconsistent argument?"); | |
1234 // However that wouldn't be right, because it's possible that | |
1235 // a safepoint is indeed in progress as a younger generation | |
1236 // stop-the-world GC happens even as we mark in this generation. | |
1237 | |
1238 _restart_for_overflow = false; | |
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1239 force_overflow_conc()->init(); |
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1240 |
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1241 // _g1h has _n_par_threads |
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1242 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1243 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1244 "Maximum number of marking threads exceeded"); |
4711 | 1245 |
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1246 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1247 |
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1248 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1249 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1250 |
1251 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1252 if (use_parallel_marking_threads()) { |
4711 | 1253 _parallel_workers->set_active_workers((int)active_workers); |
1254 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1255 // and the decisions on that MT processing is made elsewhere. | |
1256 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1257 _parallel_workers->run_task(&markingTask); |
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1258 } else { |
342 | 1259 markingTask.work(0); |
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1260 } |
342 | 1261 print_stats(); |
1262 } | |
1263 | |
1264 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1265 // world is stopped at this checkpoint | |
1266 assert(SafepointSynchronize::is_at_safepoint(), | |
1267 "world should be stopped"); | |
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1268 |
342 | 1269 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1270 | |
1271 // If a full collection has happened, we shouldn't do this. | |
1272 if (has_aborted()) { | |
1273 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1274 return; | |
1275 } | |
1276 | |
2125
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1277 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1278 |
845
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1279 if (VerifyDuringGC) { |
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1280 HandleMark hm; // handle scope |
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1281 Universe::heap()->prepare_for_verify(); |
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1282 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1283 " VerifyDuringGC:(before)"); |
845
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1284 } |
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1285 |
342 | 1286 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1287 g1p->record_concurrent_mark_remark_start(); | |
1288 | |
1289 double start = os::elapsedTime(); | |
1290 | |
1291 checkpointRootsFinalWork(); | |
1292 | |
1293 double mark_work_end = os::elapsedTime(); | |
1294 | |
1295 weakRefsWork(clear_all_soft_refs); | |
1296 | |
1297 if (has_overflown()) { | |
1298 // Oops. We overflowed. Restart concurrent marking. | |
1299 _restart_for_overflow = true; | |
8789
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1300 if (G1TraceMarkStackOverflow) { |
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1301 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1302 } |
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1303 |
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1304 // Verify the heap w.r.t. the previous marking bitmap. |
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1305 if (VerifyDuringGC) { |
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1306 HandleMark hm; // handle scope |
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1307 Universe::heap()->prepare_for_verify(); |
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1308 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1309 " VerifyDuringGC:(overflow)"); |
8789
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1310 } |
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1311 |
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1312 // Clear the marking state because we will be restarting |
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1313 // marking due to overflowing the global mark stack. |
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1314 reset_marking_state(); |
342 | 1315 } else { |
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1316 // Aggregate the per-task counting data that we have accumulated |
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1317 // while marking. |
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1318 aggregate_count_data(); |
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1319 |
2149 | 1320 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1321 // We're done with marking. |
1317
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1322 // This is the end of the marking cycle, we're expected all |
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1323 // threads to have SATB queues with active set to true. |
2149 | 1324 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1325 true /* expected_active */); | |
811 | 1326 |
1327 if (VerifyDuringGC) { | |
845
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1328 HandleMark hm; // handle scope |
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1329 Universe::heap()->prepare_for_verify(); |
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1330 Universe::verify(VerifyOption_G1UseNextMarking, |
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1331 " VerifyDuringGC:(after)"); |
811 | 1332 } |
2174
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1333 assert(!restart_for_overflow(), "sanity"); |
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1334 // Completely reset the marking state since marking completed |
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1335 set_non_marking_state(); |
2174
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1336 } |
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1337 |
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1338 // Expand the marking stack, if we have to and if we can. |
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1339 if (_markStack.should_expand()) { |
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1340 _markStack.expand(); |
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1341 } |
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1342 |
342 | 1343 // Statistics |
1344 double now = os::elapsedTime(); | |
1345 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1346 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1347 _remark_times.add((now - start) * 1000.0); | |
1348 | |
1349 g1p->record_concurrent_mark_remark_end(); | |
10405 | 1350 |
1351 G1CMIsAliveClosure is_alive(g1h); | |
1352 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
342 | 1353 } |
1354 | |
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1355 // Base class of the closures that finalize and verify the |
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1356 // liveness counting data. |
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1357 class CMCountDataClosureBase: public HeapRegionClosure { |
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1358 protected: |
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1359 G1CollectedHeap* _g1h; |
342 | 1360 ConcurrentMark* _cm; |
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1361 CardTableModRefBS* _ct_bs; |
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1362 |
342 | 1363 BitMap* _region_bm; |
1364 BitMap* _card_bm; | |
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1365 |
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1366 // Takes a region that's not empty (i.e., it has at least one |
829 | 1367 // live object in it and sets its corresponding bit on the region |
1368 // bitmap to 1. If the region is "starts humongous" it will also set | |
1369 // to 1 the bits on the region bitmap that correspond to its | |
1370 // associated "continues humongous" regions. | |
1371 void set_bit_for_region(HeapRegion* hr) { | |
1372 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1373 | |
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1374 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1375 if (!hr->startsHumongous()) { |
1376 // Normal (non-humongous) case: just set the bit. | |
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1377 _region_bm->par_at_put(index, true); |
829 | 1378 } else { |
1379 // Starts humongous case: calculate how many regions are part of | |
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1380 // this humongous region and then set the bit range. |
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1381 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
6010
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1382 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1383 } |
1384 } | |
1385 | |
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1386 public: |
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1387 CMCountDataClosureBase(G1CollectedHeap* g1h, |
6027
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1388 BitMap* region_bm, BitMap* card_bm): |
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1389 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1390 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1391 _region_bm(region_bm), _card_bm(card_bm) { } |
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1392 }; |
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1393 |
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1394 // Closure that calculates the # live objects per region. Used |
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1395 // for verification purposes during the cleanup pause. |
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1396 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1397 CMBitMapRO* _bm; |
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1398 size_t _region_marked_bytes; |
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1399 |
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1400 public: |
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1401 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1402 BitMap* region_bm, BitMap* card_bm) : |
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1403 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1404 _bm(bm), _region_marked_bytes(0) { } |
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1405 |
342 | 1406 bool doHeapRegion(HeapRegion* hr) { |
1407 | |
639 | 1408 if (hr->continuesHumongous()) { |
829 | 1409 // We will ignore these here and process them when their |
1410 // associated "starts humongous" region is processed (see | |
1411 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1412 // associated "starts humongous" region to have their bit set to | |
1413 // 1 since, due to the region chunking in the parallel region | |
1414 // iteration, a "continues humongous" region might be visited | |
1415 // before its associated "starts humongous". | |
639 | 1416 return false; |
1417 } | |
342 | 1418 |
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1419 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1420 HeapWord* start = hr->bottom(); |
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1421 |
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1422 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1423 err_msg("Preconditions not met - " |
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1424 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1425 start, ntams, hr->end())); |
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1426 |
342 | 1427 // Find the first marked object at or after "start". |
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1428 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1429 |
342 | 1430 size_t marked_bytes = 0; |
1431 | |
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1432 while (start < ntams) { |
342 | 1433 oop obj = oop(start); |
1434 int obj_sz = obj->size(); | |
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1435 HeapWord* obj_end = start + obj_sz; |
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1436 |
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1437 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1438 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1439 |
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1440 // Note: if we're looking at the last region in heap - obj_end |
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1441 // could be actually just beyond the end of the heap; end_idx |
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1442 // will then correspond to a (non-existent) card that is also |
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1443 // just beyond the heap. |
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1444 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1445 // end of object is not card aligned - increment to cover |
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1446 // all the cards spanned by the object |
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1447 end_idx += 1; |
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1448 } |
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1449 |
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1450 // Set the bits in the card BM for the cards spanned by this object. |
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1451 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1452 |
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1453 // Add the size of this object to the number of marked bytes. |
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1454 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1455 |
342 | 1456 // Find the next marked object after this one. |
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1457 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1458 } |
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1459 |
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1460 // Mark the allocated-since-marking portion... |
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1461 HeapWord* top = hr->top(); |
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1462 if (ntams < top) { |
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1463 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1464 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1465 |
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1466 // Note: if we're looking at the last region in heap - top |
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1467 // could be actually just beyond the end of the heap; end_idx |
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1468 // will then correspond to a (non-existent) card that is also |
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1469 // just beyond the heap. |
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1470 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1471 // end of object is not card aligned - increment to cover |
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1472 // all the cards spanned by the object |
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1473 end_idx += 1; |
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1474 } |
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1475 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1476 |
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1477 // This definitely means the region has live objects. |
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1478 set_bit_for_region(hr); |
342 | 1479 } |
1480 | |
1481 // Update the live region bitmap. | |
1482 if (marked_bytes > 0) { | |
829 | 1483 set_bit_for_region(hr); |
342 | 1484 } |
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1485 |
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1486 // Set the marked bytes for the current region so that |
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1487 // it can be queried by a calling verificiation routine |
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1488 _region_marked_bytes = marked_bytes; |
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1489 |
342 | 1490 return false; |
1491 } | |
1492 | |
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1493 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1494 }; |
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1495 |
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1496 // Heap region closure used for verifying the counting data |
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1497 // that was accumulated concurrently and aggregated during |
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1498 // the remark pause. This closure is applied to the heap |
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1499 // regions during the STW cleanup pause. |
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1500 |
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1501 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1502 G1CollectedHeap* _g1h; |
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1503 ConcurrentMark* _cm; |
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1504 CalcLiveObjectsClosure _calc_cl; |
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1505 BitMap* _region_bm; // Region BM to be verified |
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1506 BitMap* _card_bm; // Card BM to be verified |
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1507 bool _verbose; // verbose output? |
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1508 |
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1509 BitMap* _exp_region_bm; // Expected Region BM values |
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1510 BitMap* _exp_card_bm; // Expected card BM values |
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1511 |
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1512 int _failures; |
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1513 |
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1514 public: |
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1515 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1516 BitMap* region_bm, |
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1517 BitMap* card_bm, |
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1518 BitMap* exp_region_bm, |
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1519 BitMap* exp_card_bm, |
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1520 bool verbose) : |
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1521 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1522 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
4836
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1523 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1524 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1525 _failures(0) { } |
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1526 |
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1527 int failures() const { return _failures; } |
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1528 |
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1529 bool doHeapRegion(HeapRegion* hr) { |
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1530 if (hr->continuesHumongous()) { |
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1531 // We will ignore these here and process them when their |
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1532 // associated "starts humongous" region is processed (see |
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1533 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1534 // associated "starts humongous" region to have their bit set to |
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1535 // 1 since, due to the region chunking in the parallel region |
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1536 // iteration, a "continues humongous" region might be visited |
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1537 // before its associated "starts humongous". |
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1538 return false; |
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|
1539 } |
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|
1540 |
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1541 int failures = 0; |
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1542 |
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1543 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1544 // this region and set the corresponding bits in the expected region |
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1545 // and card bitmaps. |
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1546 bool res = _calc_cl.doHeapRegion(hr); |
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1547 assert(res == false, "should be continuing"); |
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|
1548 |
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1549 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1550 Mutex::_no_safepoint_check_flag); |
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|
1551 |
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1552 // Verify the marked bytes for this region. |
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1553 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1554 size_t act_marked_bytes = hr->next_marked_bytes(); |
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|
1555 |
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|
1556 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1557 // we have missed accounting some objects during the actual marking. |
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|
1558 if (exp_marked_bytes > act_marked_bytes) { |
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|
1559 if (_verbose) { |
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|
1560 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1561 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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|
1562 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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|
1563 } |
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|
1564 failures += 1; |
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|
1565 } |
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|
1566 |
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|
1567 // Verify the bit, for this region, in the actual and expected |
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1568 // (which was just calculated) region bit maps. |
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1569 // We're not OK if the bit in the calculated expected region |
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1570 // bitmap is set and the bit in the actual region bitmap is not. |
6010
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1571 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
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1572 |
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|
1573 bool expected = _exp_region_bm->at(index); |
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1574 bool actual = _region_bm->at(index); |
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1575 if (expected && !actual) { |
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1576 if (_verbose) { |
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1577 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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|
1578 "expected: %s, actual: %s", |
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|
1579 hr->hrs_index(), |
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|
1580 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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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 that the card bit maps for the cards spanned by the current |
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1586 // region match. We have an error if we have a set bit in the expected |
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1587 // bit map and the corresponding bit in the actual bitmap is not set. |
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|
1588 |
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1589 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1590 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1591 |
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1592 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1593 expected = _exp_card_bm->at(i); |
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1594 actual = _card_bm->at(i); |
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|
1595 |
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1596 if (expected && !actual) { |
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|
1597 if (_verbose) { |
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1598 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1599 "expected: %s, actual: %s", |
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1600 hr->hrs_index(), i, |
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1601 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1602 } |
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|
1603 failures += 1; |
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|
1604 } |
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|
1605 } |
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|
1606 |
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1607 if (failures > 0 && _verbose) { |
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1608 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1609 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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1610 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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1611 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1612 } |
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|
1613 |
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1614 _failures += failures; |
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|
1615 |
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1616 // We could stop iteration over the heap when we |
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1617 // find the first violating region by returning true. |
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1618 return false; |
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1619 } |
342 | 1620 }; |
1621 | |
1622 | |
4836
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1623 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1624 protected: |
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1625 G1CollectedHeap* _g1h; |
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1626 ConcurrentMark* _cm; |
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1627 BitMap* _actual_region_bm; |
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1628 BitMap* _actual_card_bm; |
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1629 |
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1630 uint _n_workers; |
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|
1631 |
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1632 BitMap* _expected_region_bm; |
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1633 BitMap* _expected_card_bm; |
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|
1634 |
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|
1635 int _failures; |
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|
1636 bool _verbose; |
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|
1637 |
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|
1638 public: |
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|
1639 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1640 BitMap* region_bm, BitMap* card_bm, |
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1641 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1642 : AbstractGangTask("G1 verify final counting"), |
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1643 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1644 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1645 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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|
1646 _failures(0), _verbose(false), |
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|
1647 _n_workers(0) { |
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|
1648 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1649 |
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1650 // Use the value already set as the number of active threads |
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|
1651 // in the call to run_task(). |
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|
1652 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1653 assert( _g1h->workers()->active_workers() > 0, |
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|
1654 "Should have been previously set"); |
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|
1655 _n_workers = _g1h->workers()->active_workers(); |
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|
1656 } else { |
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diff
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|
1657 _n_workers = 1; |
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diff
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|
1658 } |
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|
1659 |
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|
1660 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1661 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1662 |
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|
1663 _verbose = _cm->verbose_medium(); |
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|
1664 } |
d30fa85f9994
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diff
changeset
|
1665 |
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diff
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|
1666 void work(uint worker_id) { |
d30fa85f9994
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|
1667 assert(worker_id < _n_workers, "invariant"); |
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|
1668 |
6812
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diff
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|
1669 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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|
1670 _actual_region_bm, _actual_card_bm, |
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|
1671 _expected_region_bm, |
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diff
changeset
|
1672 _expected_card_bm, |
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diff
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|
1673 _verbose); |
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diff
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|
1674 |
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diff
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|
1675 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1676 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1677 worker_id, |
d30fa85f9994
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diff
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|
1678 _n_workers, |
d30fa85f9994
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diff
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|
1679 HeapRegion::VerifyCountClaimValue); |
d30fa85f9994
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diff
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|
1680 } else { |
d30fa85f9994
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diff
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|
1681 _g1h->heap_region_iterate(&verify_cl); |
d30fa85f9994
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|
1682 } |
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diff
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|
1683 |
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|
1684 Atomic::add(verify_cl.failures(), &_failures); |
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|
1685 } |
d30fa85f9994
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diff
changeset
|
1686 |
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diff
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|
1687 int failures() const { return _failures; } |
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|
1688 }; |
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|
1689 |
6027
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|
1690 // Closure that finalizes the liveness counting data. |
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|
1691 // Used during the cleanup pause. |
8a2e5a6a19a4
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|
1692 // Sets the bits corresponding to the interval [NTAMS, top] |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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diff
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|
1693 // (which contains the implicitly live objects) in the |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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changeset
|
1694 // card liveness bitmap. Also sets the bit for each region, |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1695 // containing live data, in the region liveness bitmap. |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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changeset
|
1696 |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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diff
changeset
|
1697 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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diff
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|
1698 public: |
6812
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diff
changeset
|
1699 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
4836
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|
1700 BitMap* region_bm, |
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|
1701 BitMap* card_bm) : |
6812
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diff
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|
1702 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1703 |
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changeset
|
1704 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
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|
1705 |
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diff
changeset
|
1706 if (hr->continuesHumongous()) { |
d30fa85f9994
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diff
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|
1707 // We will ignore these here and process them when their |
d30fa85f9994
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changeset
|
1708 // associated "starts humongous" region is processed (see |
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1709 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1710 // associated "starts humongous" region to have their bit set to |
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1711 // 1 since, due to the region chunking in the parallel region |
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|
1712 // iteration, a "continues humongous" region might be visited |
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1713 // before its associated "starts humongous". |
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|
1714 return false; |
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|
1715 } |
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|
1716 |
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|
1717 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1718 HeapWord* top = hr->top(); |
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|
1719 |
6027
8a2e5a6a19a4
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1720 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1721 |
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|
1722 // Mark the allocated-since-marking portion... |
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|
1723 if (ntams < top) { |
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|
1724 // This definitely means the region has live objects. |
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1725 set_bit_for_region(hr); |
6812
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|
1726 |
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|
1727 // Now set the bits in the card bitmap for [ntams, top) |
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|
1728 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1729 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1730 |
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1731 // Note: if we're looking at the last region in heap - top |
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1732 // could be actually just beyond the end of the heap; end_idx |
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1733 // will then correspond to a (non-existent) card that is also |
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|
1734 // just beyond the heap. |
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|
1735 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1736 // end of object is not card aligned - increment to cover |
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|
1737 // all the cards spanned by the object |
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|
1738 end_idx += 1; |
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|
1739 } |
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|
1740 |
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|
1741 assert(end_idx <= _card_bm->size(), |
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|
1742 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1743 end_idx, _card_bm->size())); |
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|
1744 assert(start_idx < _card_bm->size(), |
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|
1745 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1746 start_idx, _card_bm->size())); |
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|
1747 |
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|
1748 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
da91efe96a93
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1749 } |
4836
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|
1750 |
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|
1751 // Set the bit for the region if it contains live data |
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1752 if (hr->next_marked_bytes() > 0) { |
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1753 set_bit_for_region(hr); |
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|
1754 } |
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|
1755 |
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|
1756 return false; |
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|
1757 } |
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|
1758 }; |
342 | 1759 |
1760 class G1ParFinalCountTask: public AbstractGangTask { | |
1761 protected: | |
1762 G1CollectedHeap* _g1h; | |
4836
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|
1763 ConcurrentMark* _cm; |
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|
1764 BitMap* _actual_region_bm; |
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1765 BitMap* _actual_card_bm; |
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1766 |
4728
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|
1767 uint _n_workers; |
4836
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1768 |
342 | 1769 public: |
4836
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1770 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1771 : AbstractGangTask("G1 final counting"), |
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1772 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1773 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1774 _n_workers(0) { |
4095
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|
1775 // Use the value already set as the number of active threads |
6011 | 1776 // in the call to run_task(). |
4095
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1777 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1778 assert( _g1h->workers()->active_workers() > 0, |
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|
1779 "Should have been previously set"); |
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|
1780 _n_workers = _g1h->workers()->active_workers(); |
3776
23d434c6290d
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1781 } else { |
342 | 1782 _n_workers = 1; |
3776
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|
1783 } |
342 | 1784 } |
1785 | |
4728
441e946dc1af
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|
1786 void work(uint worker_id) { |
4836
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1787 assert(worker_id < _n_workers, "invariant"); |
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|
1788 |
6812
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|
1789 FinalCountDataUpdateClosure final_update_cl(_g1h, |
4836
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1790 _actual_region_bm, |
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|
1791 _actual_card_bm); |
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|
1792 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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|
1793 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4836
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1794 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1795 worker_id, |
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|
1796 _n_workers, |
355 | 1797 HeapRegion::FinalCountClaimValue); |
342 | 1798 } else { |
4836
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1799 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1800 } |
1801 } | |
1802 }; | |
1803 | |
1804 class G1ParNoteEndTask; | |
1805 | |
1806 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1807 G1CollectedHeap* _g1; | |
1808 int _worker_num; | |
1809 size_t _max_live_bytes; | |
6010
720b6a76dd9d
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1810 uint _regions_claimed; |
342 | 1811 size_t _freed_bytes; |
2173 | 1812 FreeRegionList* _local_cleanup_list; |
4072 | 1813 OldRegionSet* _old_proxy_set; |
2173 | 1814 HumongousRegionSet* _humongous_proxy_set; |
1815 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1816 double _claimed_region_time; |
1817 double _max_region_time; | |
1818 | |
1819 public: | |
1820 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1821 int worker_num, |
1822 FreeRegionList* local_cleanup_list, | |
4072 | 1823 OldRegionSet* old_proxy_set, |
2173 | 1824 HumongousRegionSet* humongous_proxy_set, |
4093
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1825 HRRSCleanupTask* hrrs_cleanup_task) : |
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1826 _g1(g1), _worker_num(worker_num), |
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1827 _max_live_bytes(0), _regions_claimed(0), |
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|
1828 _freed_bytes(0), |
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|
1829 _claimed_region_time(0.0), _max_region_time(0.0), |
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|
1830 _local_cleanup_list(local_cleanup_list), |
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1831 _old_proxy_set(old_proxy_set), |
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|
1832 _humongous_proxy_set(humongous_proxy_set), |
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|
1833 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1834 |
342 | 1835 size_t freed_bytes() { return _freed_bytes; } |
1836 | |
4093
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|
1837 bool doHeapRegion(HeapRegion *hr) { |
6254
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1838 if (hr->continuesHumongous()) { |
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1839 return false; |
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|
1840 } |
4093
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|
1841 // We use a claim value of zero here because all regions |
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|
1842 // were claimed with value 1 in the FinalCount task. |
6254
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|
1843 _g1->reset_gc_time_stamps(hr); |
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|
1844 double start = os::elapsedTime(); |
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|
1845 _regions_claimed++; |
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|
1846 hr->note_end_of_marking(); |
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|
1847 _max_live_bytes += hr->max_live_bytes(); |
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1848 _g1->free_region_if_empty(hr, |
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1849 &_freed_bytes, |
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1850 _local_cleanup_list, |
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|
1851 _old_proxy_set, |
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1852 _humongous_proxy_set, |
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1853 _hrrs_cleanup_task, |
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|
1854 true /* par */); |
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|
1855 double region_time = (os::elapsedTime() - start); |
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1856 _claimed_region_time += region_time; |
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|
1857 if (region_time > _max_region_time) { |
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|
1858 _max_region_time = region_time; |
4093
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|
1859 } |
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|
1860 return false; |
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1861 } |
342 | 1862 |
1863 size_t max_live_bytes() { return _max_live_bytes; } | |
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1864 uint regions_claimed() { return _regions_claimed; } |
342 | 1865 double claimed_region_time_sec() { return _claimed_region_time; } |
1866 double max_region_time_sec() { return _max_region_time; } | |
1867 }; | |
1868 | |
1869 class G1ParNoteEndTask: public AbstractGangTask { | |
1870 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1871 |
342 | 1872 protected: |
1873 G1CollectedHeap* _g1h; | |
1874 size_t _max_live_bytes; | |
1875 size_t _freed_bytes; | |
2152 | 1876 FreeRegionList* _cleanup_list; |
1877 | |
342 | 1878 public: |
1879 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1880 FreeRegionList* cleanup_list) : |
342 | 1881 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1882 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1883 |
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1884 void work(uint worker_id) { |
342 | 1885 double start = os::elapsedTime(); |
2173 | 1886 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1887 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1888 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1889 HRRSCleanupTask hrrs_cleanup_task; | |
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1890 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1891 &old_proxy_set, |
2173 | 1892 &humongous_proxy_set, |
1893 &hrrs_cleanup_task); | |
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1894 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1895 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1896 _g1h->workers()->active_workers(), |
355 | 1897 HeapRegion::NoteEndClaimValue); |
342 | 1898 } else { |
1899 _g1h->heap_region_iterate(&g1_note_end); | |
1900 } | |
1901 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1902 | |
2152 | 1903 // Now update the lists |
1904 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1905 NULL /* free_list */, | |
4072 | 1906 &old_proxy_set, |
2173 | 1907 &humongous_proxy_set, |
2152 | 1908 true /* par */); |
342 | 1909 { |
1910 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1911 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1912 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1913 |
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1914 // If we iterate over the global cleanup list at the end of |
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1915 // cleanup to do this printing we will not guarantee to only |
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1916 // generate output for the newly-reclaimed regions (the list |
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1917 // might not be empty at the beginning of cleanup; we might |
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1918 // still be working on its previous contents). So we do the |
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1919 // printing here, before we append the new regions to the global |
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1920 // cleanup list. |
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1921 |
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1922 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1923 if (hr_printer->is_active()) { |
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1924 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1925 while (iter.more_available()) { |
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1926 HeapRegion* hr = iter.get_next(); |
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1927 hr_printer->cleanup(hr); |
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1928 } |
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1929 } |
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1930 |
2173 | 1931 _cleanup_list->add_as_tail(&local_cleanup_list); |
1932 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1933 | |
1934 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1935 } |
1936 } | |
1937 size_t max_live_bytes() { return _max_live_bytes; } | |
1938 size_t freed_bytes() { return _freed_bytes; } | |
1939 }; | |
1940 | |
1941 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1942 protected: | |
1943 G1RemSet* _g1rs; | |
1944 BitMap* _region_bm; | |
1945 BitMap* _card_bm; | |
1946 public: | |
1947 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1948 BitMap* region_bm, BitMap* card_bm) : | |
1949 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1950 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1951 |
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1952 void work(uint worker_id) { |
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1953 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1954 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1955 HeapRegion::ScrubRemSetClaimValue); |
342 | 1956 } else { |
1957 _g1rs->scrub(_region_bm, _card_bm); | |
1958 } | |
1959 } | |
1960 | |
1961 }; | |
1962 | |
1963 void ConcurrentMark::cleanup() { | |
1964 // world is stopped at this checkpoint | |
1965 assert(SafepointSynchronize::is_at_safepoint(), | |
1966 "world should be stopped"); | |
1967 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1968 | |
1969 // If a full collection has happened, we shouldn't do this. | |
1970 if (has_aborted()) { | |
1971 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1972 return; | |
1973 } | |
1974 | |
4072 | 1975 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1976 g1h->verify_region_sets_optional(); |
1977 | |
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1978 if (VerifyDuringGC) { |
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1979 HandleMark hm; // handle scope |
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1980 Universe::heap()->prepare_for_verify(); |
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1981 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1982 " VerifyDuringGC:(before)"); |
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1983 } |
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1984 |
342 | 1985 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1986 g1p->record_concurrent_mark_cleanup_start(); | |
1987 | |
1988 double start = os::elapsedTime(); | |
1989 | |
2173 | 1990 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1991 | |
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1992 uint n_workers; |
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1993 |
342 | 1994 // Do counting once more with the world stopped for good measure. |
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1995 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1996 |
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1997 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1998 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1999 "sanity check"); |
2000 | |
4711 | 2001 g1h->set_par_threads(); |
2002 n_workers = g1h->n_par_threads(); | |
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2003 assert(g1h->n_par_threads() == n_workers, |
4711 | 2004 "Should not have been reset"); |
342 | 2005 g1h->workers()->run_task(&g1_par_count_task); |
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2006 // Done with the parallel phase so reset to 0. |
342 | 2007 g1h->set_par_threads(0); |
355 | 2008 |
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2009 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2010 "sanity check"); |
342 | 2011 } else { |
4711 | 2012 n_workers = 1; |
342 | 2013 g1_par_count_task.work(0); |
2014 } | |
2015 | |
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2016 if (VerifyDuringGC) { |
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2017 // Verify that the counting data accumulated during marking matches |
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2018 // that calculated by walking the marking bitmap. |
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2019 |
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2020 // Bitmaps to hold expected values |
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2021 BitMap expected_region_bm(_region_bm.size(), false); |
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2022 BitMap expected_card_bm(_card_bm.size(), false); |
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2023 |
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2024 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2025 &_region_bm, |
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2026 &_card_bm, |
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2027 &expected_region_bm, |
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2028 &expected_card_bm); |
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2029 |
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2030 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2031 g1h->set_par_threads((int)n_workers); |
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2032 g1h->workers()->run_task(&g1_par_verify_task); |
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2033 // Done with the parallel phase so reset to 0. |
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2034 g1h->set_par_threads(0); |
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2035 |
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2036 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2037 "sanity check"); |
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2038 } else { |
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2039 g1_par_verify_task.work(0); |
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2040 } |
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2041 |
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2042 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2043 } |
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2044 |
342 | 2045 size_t start_used_bytes = g1h->used(); |
2046 g1h->set_marking_complete(); | |
2047 | |
2048 double count_end = os::elapsedTime(); | |
2049 double this_final_counting_time = (count_end - start); | |
2050 _total_counting_time += this_final_counting_time; | |
2051 | |
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2052 if (G1PrintRegionLivenessInfo) { |
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2053 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2054 _g1h->heap_region_iterate(&cl); |
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2055 } |
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2056 |
342 | 2057 // Install newly created mark bitMap as "prev". |
2058 swapMarkBitMaps(); | |
2059 | |
2060 g1h->reset_gc_time_stamp(); | |
2061 | |
2062 // Note end of marking in all heap regions. | |
2152 | 2063 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2064 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2065 g1h->set_par_threads((int)n_workers); |
342 | 2066 g1h->workers()->run_task(&g1_par_note_end_task); |
2067 g1h->set_par_threads(0); | |
355 | 2068 |
2069 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2070 "sanity check"); | |
342 | 2071 } else { |
2072 g1_par_note_end_task.work(0); | |
2073 } | |
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2074 g1h->check_gc_time_stamps(); |
2152 | 2075 |
2076 if (!cleanup_list_is_empty()) { | |
2077 // The cleanup list is not empty, so we'll have to process it | |
2078 // concurrently. Notify anyone else that might be wanting free | |
2079 // regions that there will be more free regions coming soon. | |
2080 g1h->set_free_regions_coming(); | |
2081 } | |
342 | 2082 |
2083 // call below, since it affects the metric by which we sort the heap | |
2084 // regions. | |
2085 if (G1ScrubRemSets) { | |
2086 double rs_scrub_start = os::elapsedTime(); | |
2087 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2088 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2089 g1h->set_par_threads((int)n_workers); |
342 | 2090 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2091 g1h->set_par_threads(0); | |
355 | 2092 |
2093 assert(g1h->check_heap_region_claim_values( | |
2094 HeapRegion::ScrubRemSetClaimValue), | |
2095 "sanity check"); | |
342 | 2096 } else { |
2097 g1_par_scrub_rs_task.work(0); | |
2098 } | |
2099 | |
2100 double rs_scrub_end = os::elapsedTime(); | |
2101 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2102 _total_rs_scrub_time += this_rs_scrub_time; | |
2103 } | |
2104 | |
2105 // this will also free any regions totally full of garbage objects, | |
2106 // and sort the regions. | |
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|
2107 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2108 |
2109 // Statistics. | |
2110 double end = os::elapsedTime(); | |
2111 _cleanup_times.add((end - start) * 1000.0); | |
2112 | |
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2113 if (G1Log::fine()) { |
342 | 2114 g1h->print_size_transition(gclog_or_tty, |
2115 start_used_bytes, | |
2116 g1h->used(), | |
2117 g1h->capacity()); | |
2118 } | |
2119 | |
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2120 // Clean up will have freed any regions completely full of garbage. |
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2121 // Update the soft reference policy with the new heap occupancy. |
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2122 Universe::update_heap_info_at_gc(); |
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2123 |
342 | 2124 // We need to make this be a "collection" so any collection pause that |
2125 // races with it goes around and waits for completeCleanup to finish. | |
2126 g1h->increment_total_collections(); | |
2127 | |
4830
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|
2128 // We reclaimed old regions so we should calculate the sizes to make |
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2129 // sure we update the old gen/space data. |
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2130 g1h->g1mm()->update_sizes(); |
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2131 |
751 | 2132 if (VerifyDuringGC) { |
845
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|
2133 HandleMark hm; // handle scope |
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2134 Universe::heap()->prepare_for_verify(); |
10186
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2135 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2136 " VerifyDuringGC:(after)"); |
342 | 2137 } |
2152 | 2138 |
2139 g1h->verify_region_sets_optional(); | |
10405 | 2140 g1h->trace_heap_after_concurrent_cycle(); |
342 | 2141 } |
2142 | |
2143 void ConcurrentMark::completeCleanup() { | |
2144 if (has_aborted()) return; | |
2145 | |
2152 | 2146 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2147 | |
2148 _cleanup_list.verify_optional(); | |
2361 | 2149 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2150 |
2151 if (G1ConcRegionFreeingVerbose) { | |
2152 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2153 "cleanup list has %u entries", |
2152 | 2154 _cleanup_list.length()); |
2155 } | |
2156 | |
2157 // Noone else should be accessing the _cleanup_list at this point, | |
2158 // so it's not necessary to take any locks | |
2159 while (!_cleanup_list.is_empty()) { | |
2160 HeapRegion* hr = _cleanup_list.remove_head(); | |
2161 assert(hr != NULL, "the list was not empty"); | |
3317
063382f9b575
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|
2162 hr->par_clear(); |
2361 | 2163 tmp_free_list.add_as_tail(hr); |
2152 | 2164 |
2165 // Instead of adding one region at a time to the secondary_free_list, | |
2166 // we accumulate them in the local list and move them a few at a | |
2167 // time. This also cuts down on the number of notify_all() calls | |
2168 // we do during this process. We'll also append the local list when | |
2169 // _cleanup_list is empty (which means we just removed the last | |
2170 // region from the _cleanup_list). | |
2361 | 2171 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2172 _cleanup_list.is_empty()) { |
2173 if (G1ConcRegionFreeingVerbose) { | |
2174 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2175 "appending %u entries to the secondary_free_list, " |
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2176 "cleanup list still has %u entries", |
2361 | 2177 tmp_free_list.length(), |
2152 | 2178 _cleanup_list.length()); |
342 | 2179 } |
2152 | 2180 |
2181 { | |
2182 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2183 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2184 SecondaryFreeList_lock->notify_all(); |
2185 } | |
2186 | |
2187 if (G1StressConcRegionFreeing) { | |
2188 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2189 os::sleep(Thread::current(), (jlong) 1, false); | |
2190 } | |
2191 } | |
342 | 2192 } |
2193 } | |
2361 | 2194 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2195 } |
2196 | |
8014
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|
2197 // Supporting Object and Oop closures for reference discovery |
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|
2198 // and processing in during marking |
2174
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|
2199 |
2037
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|
2200 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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|
2201 HeapWord* addr = (HeapWord*)obj; |
b03260081e9b
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|
2202 return addr != NULL && |
b03260081e9b
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diff
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|
2203 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
b03260081e9b
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|
2204 } |
342 | 2205 |
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|
2206 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
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|
2207 // Uses the CMTask associated with a worker thread (for serial reference |
f90b9bceb8e5
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|
2208 // processing the CMTask for worker 0 is used) to preserve (mark) and |
f90b9bceb8e5
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|
2209 // trace referent objects. |
f90b9bceb8e5
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|
2210 // |
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|
2211 // Using the CMTask and embedded local queues avoids having the worker |
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|
2212 // threads operating on the global mark stack. This reduces the risk |
f90b9bceb8e5
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|
2213 // of overflowing the stack - which we would rather avoid at this late |
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|
2214 // state. Also using the tasks' local queues removes the potential |
f90b9bceb8e5
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|
2215 // of the workers interfering with each other that could occur if |
f90b9bceb8e5
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|
2216 // operating on the global stack. |
f90b9bceb8e5
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|
2217 |
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|
2218 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
8787
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8009536: G1: Apache Lucene hang during reference processing
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|
2219 ConcurrentMark* _cm; |
fa08949fe0cb
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|
2220 CMTask* _task; |
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|
2221 int _ref_counter_limit; |
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|
2222 int _ref_counter; |
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|
2223 bool _is_serial; |
2174
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|
2224 public: |
8787
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|
2225 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
2226 _cm(cm), _task(task), _is_serial(is_serial), |
fa08949fe0cb
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|
2227 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
234761c55641
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2152
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|
2228 assert(_ref_counter_limit > 0, "sanity"); |
8787
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|
2229 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
2230 _ref_counter = _ref_counter_limit; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
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|
2231 } |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2232 |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2233 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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|
2234 virtual void do_oop( oop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
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|
2235 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2236 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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|
2237 if (!_cm->has_overflown()) { |
234761c55641
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johnc
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2152
diff
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|
2238 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
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|
2239 if (_cm->verbose_high()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
2240 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
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|
2241 "*"PTR_FORMAT" = "PTR_FORMAT, |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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|
2242 _task->worker_id(), p, (void*) obj); |
3776
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3772
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|
2243 } |
2174
234761c55641
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2152
diff
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|
2244 |
234761c55641
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2152
diff
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|
2245 _task->deal_with_reference(obj); |
234761c55641
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johnc
parents:
2152
diff
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|
2246 _ref_counter--; |
234761c55641
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parents:
2152
diff
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|
2247 |
234761c55641
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|
2248 if (_ref_counter == 0) { |
8014
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8005032: G1: Cleanup serial reference processing closures in concurrent marking
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|
2249 // We have dealt with _ref_counter_limit references, pushing them |
f90b9bceb8e5
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|
2250 // and objects reachable from them on to the local stack (and |
f90b9bceb8e5
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|
2251 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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8008
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|
2252 // process these entries. |
f90b9bceb8e5
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8008
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|
2253 // |
f90b9bceb8e5
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|
2254 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
f90b9bceb8e5
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|
2255 // there's nothing more to do (i.e. we're done with the entries that |
f90b9bceb8e5
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8008
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|
2256 // were pushed as a result of the CMTask::deal_with_reference() calls |
f90b9bceb8e5
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|
2257 // above) or we overflow. |
f90b9bceb8e5
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|
2258 // |
f90b9bceb8e5
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|
2259 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
f90b9bceb8e5
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|
2260 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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|
2261 // the beginning of CMTask::do_marking_step() for those conditions - |
f90b9bceb8e5
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|
2262 // one of which is reaching the specified time target.) It is only |
f90b9bceb8e5
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|
2263 // when CMTask::do_marking_step() returns without setting the |
f90b9bceb8e5
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|
2264 // has_aborted() flag that the marking step has completed. |
2174
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|
2265 do { |
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|
2266 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
234761c55641
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|
2267 _task->do_marking_step(mark_step_duration_ms, |
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|
2268 false /* do_termination */, |
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|
2269 _is_serial); |
2174
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|
2270 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2271 _ref_counter = _ref_counter_limit; |
234761c55641
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|
2272 } |
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|
2273 } else { |
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|
2274 if (_cm->verbose_high()) { |
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|
2275 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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2276 } |
2174
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|
2277 } |
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|
2278 } |
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|
2279 }; |
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|
2280 |
8014
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|
2281 // 'Drain' oop closure used by both serial and parallel reference processing. |
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|
2282 // Uses the CMTask associated with a given worker thread (for serial |
f90b9bceb8e5
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|
2283 // reference processing the CMtask for worker 0 is used). Calls the |
f90b9bceb8e5
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|
2284 // do_marking_step routine, with an unbelievably large timeout value, |
f90b9bceb8e5
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2285 // to drain the marking data structures of the remaining entries |
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2286 // added by the 'keep alive' oop closure above. |
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2287 |
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2288 class G1CMDrainMarkingStackClosure: public VoidClosure { |
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2289 ConcurrentMark* _cm; |
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2290 CMTask* _task; |
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2291 bool _is_serial; |
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2292 public: |
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2293 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2294 _cm(cm), _task(task), _is_serial(is_serial) { |
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2295 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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2296 } |
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2297 |
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2298 void do_void() { |
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2299 do { |
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2300 if (_cm->verbose_high()) { |
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2301 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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2302 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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2303 } |
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2304 |
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2305 // We call CMTask::do_marking_step() to completely drain the local |
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2306 // and global marking stacks of entries pushed by the 'keep alive' |
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2307 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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2308 // |
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2309 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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2310 // if there's nothing more to do (i.e. we'completely drained the |
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2311 // entries that were pushed as a a result of applying the 'keep alive' |
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2312 // closure to the entries on the discovered ref lists) or we overflow |
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2313 // the global marking stack. |
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2314 // |
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2315 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2316 // flag while there may still be some work to do. (See the comment at |
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2317 // the beginning of CMTask::do_marking_step() for those conditions - |
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2318 // one of which is reaching the specified time target.) It is only |
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2319 // when CMTask::do_marking_step() returns without setting the |
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2320 // has_aborted() flag that the marking step has completed. |
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2321 |
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2322 _task->do_marking_step(1000000000.0 /* something very large */, |
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2323 true /* do_termination */, |
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2324 _is_serial); |
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2325 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2326 } |
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2327 }; |
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2328 |
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2329 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2330 // reference processing at the end of G1 concurrent marking |
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2331 |
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2332 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2333 private: |
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2334 G1CollectedHeap* _g1h; |
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2335 ConcurrentMark* _cm; |
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2336 WorkGang* _workers; |
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|
2337 int _active_workers; |
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|
2338 |
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|
2339 public: |
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2340 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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2341 ConcurrentMark* cm, |
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2342 WorkGang* workers, |
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|
2343 int n_workers) : |
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2344 _g1h(g1h), _cm(cm), |
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2345 _workers(workers), _active_workers(n_workers) { } |
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2346 |
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|
2347 // Executes the given task using concurrent marking worker threads. |
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|
2348 virtual void execute(ProcessTask& task); |
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|
2349 virtual void execute(EnqueueTask& task); |
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|
2350 }; |
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|
2351 |
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2352 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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|
2353 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2354 ProcessTask& _proc_task; |
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|
2355 G1CollectedHeap* _g1h; |
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|
2356 ConcurrentMark* _cm; |
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|
2357 |
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|
2358 public: |
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|
2359 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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2360 G1CollectedHeap* g1h, |
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2361 ConcurrentMark* cm) : |
2174
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|
2362 AbstractGangTask("Process reference objects in parallel"), |
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2363 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
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2364 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
2365 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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2366 } |
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|
2367 |
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2368 virtual void work(uint worker_id) { |
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2369 CMTask* task = _cm->task(worker_id); |
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2370 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2371 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
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2372 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
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2373 |
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2374 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2375 } |
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|
2376 }; |
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|
2377 |
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2378 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2379 assert(_workers != NULL, "Need parallel worker threads."); |
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2380 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2381 |
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2382 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
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2383 |
8788
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2384 // We need to reset the concurrency level before each |
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2385 // proxy task execution, so that the termination protocol |
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2386 // and overflow handling in CMTask::do_marking_step() knows |
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2387 // how many workers to wait for. |
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2388 _cm->set_concurrency(_active_workers); |
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2389 _g1h->set_par_threads(_active_workers); |
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2390 _workers->run_task(&proc_task_proxy); |
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2391 _g1h->set_par_threads(0); |
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2392 } |
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2393 |
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2394 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
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2395 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2396 EnqueueTask& _enq_task; |
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|
2397 |
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2398 public: |
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2399 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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2400 AbstractGangTask("Enqueue reference objects in parallel"), |
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2401 _enq_task(enq_task) { } |
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2402 |
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2403 virtual void work(uint worker_id) { |
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2404 _enq_task.work(worker_id); |
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2405 } |
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2406 }; |
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2407 |
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2408 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2409 assert(_workers != NULL, "Need parallel worker threads."); |
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2410 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2411 |
3979
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2412 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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2413 |
8788
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|
2414 // Not strictly necessary but... |
e864cc14ca75
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diff
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|
2415 // |
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|
2416 // We need to reset the concurrency level before each |
e864cc14ca75
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|
2417 // proxy task execution, so that the termination protocol |
e864cc14ca75
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|
2418 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
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|
2419 // how many workers to wait for. |
e864cc14ca75
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|
2420 _cm->set_concurrency(_active_workers); |
2174
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|
2421 _g1h->set_par_threads(_active_workers); |
234761c55641
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|
2422 _workers->run_task(&enq_task_proxy); |
234761c55641
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|
2423 _g1h->set_par_threads(0); |
234761c55641
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|
2424 } |
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|
2425 |
342 | 2426 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
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|
2427 if (has_overflown()) { |
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|
2428 // Skip processing the discovered references if we have |
e864cc14ca75
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|
2429 // overflown the global marking stack. Reference objects |
e864cc14ca75
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|
2430 // only get discovered once so it is OK to not |
e864cc14ca75
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johnc
parents:
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diff
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|
2431 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
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|
2432 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
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|
2433 // less reference objects are discovered. |
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|
2434 return; |
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|
2435 } |
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|
2436 |
342 | 2437 ResourceMark rm; |
2438 HandleMark hm; | |
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|
2439 |
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|
2440 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2441 |
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|
2442 // Is alive closure. |
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|
2443 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2444 |
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diff
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|
2445 // Inner scope to exclude the cleaning of the string and symbol |
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diff
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|
2446 // tables from the displayed time. |
1847b501ae74
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|
2447 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
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5988
diff
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|
2448 if (G1Log::finer()) { |
3975
1847b501ae74
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|
2449 gclog_or_tty->put(' '); |
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|
2450 } |
10405 | 2451 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm()); |
3975
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|
2452 |
3979
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|
2453 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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|
2454 |
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|
2455 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
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|
2456 // about how reference processing currently works in G1. |
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|
2457 |
8014
f90b9bceb8e5
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|
2458 // Set the soft reference policy |
3975
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|
2459 rp->setup_policy(clear_all_soft_refs); |
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|
2460 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
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|
2461 |
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|
2462 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
fa08949fe0cb
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diff
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|
2463 // in serial reference processing. Note these closures are also |
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diff
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|
2464 // used for serially processing (by the the current thread) the |
fa08949fe0cb
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diff
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|
2465 // JNI references during parallel reference processing. |
fa08949fe0cb
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diff
changeset
|
2466 // |
fa08949fe0cb
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diff
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|
2467 // These closures do not need to synchronize with the worker |
fa08949fe0cb
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diff
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|
2468 // threads involved in parallel reference processing as these |
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diff
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|
2469 // instances are executed serially by the current thread (e.g. |
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diff
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|
2470 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
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diff
changeset
|
2471 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
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diff
changeset
|
2472 // |
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diff
changeset
|
2473 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
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8744
diff
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|
2474 // their own instances of these closures, which do their own |
fa08949fe0cb
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diff
changeset
|
2475 // synchronization among themselves. |
fa08949fe0cb
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diff
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|
2476 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
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|
2477 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
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diff
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|
2478 |
fa08949fe0cb
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diff
changeset
|
2479 // We need at least one active thread. If reference processing |
fa08949fe0cb
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diff
changeset
|
2480 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
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diff
changeset
|
2481 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
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8744
diff
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|
2482 // we utilize all the worker threads we can. |
fa08949fe0cb
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8744
diff
changeset
|
2483 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
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diff
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|
2484 uint active_workers = (processing_is_mt ? g1h->workers()->active_workers() : 1U); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
2485 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
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|
2486 |
8787
fa08949fe0cb
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diff
changeset
|
2487 // Parallel processing task executor. |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2488 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
diff
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|
2489 g1h->workers(), active_workers); |
8787
fa08949fe0cb
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parents:
8744
diff
changeset
|
2490 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2491 |
8788
e864cc14ca75
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diff
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|
2492 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
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8787
diff
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|
2493 // executing the remark task. |
e864cc14ca75
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8787
diff
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|
2494 set_concurrency(active_workers); |
e864cc14ca75
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8787
diff
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|
2495 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2496 // Set the degree of MT processing here. If the discovery was done MT, |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2497 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2498 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2499 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2500 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2501 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2502 // Process the weak references. |
10405 | 2503 const ReferenceProcessorStats& stats = |
2504 rp->process_discovered_references(&g1_is_alive, | |
2505 &g1_keep_alive, | |
2506 &g1_drain_mark_stack, | |
2507 executor, | |
2508 g1h->gc_timer_cm()); | |
2509 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); | |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2510 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2511 // 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
|
2512 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2513 // global marking stack. |
3975
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|
2514 |
1847b501ae74
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diff
changeset
|
2515 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
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3914
diff
changeset
|
2516 "mark stack should be empty (unless it overflowed)"); |
8787
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|
2517 |
3975
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diff
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|
2518 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2519 // This should have been done already when we tried to push an |
3975
1847b501ae74
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diff
changeset
|
2520 // entry on to the global mark stack. But let's do it again. |
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|
2521 set_has_overflown(); |
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diff
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|
2522 } |
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|
2523 |
8014
f90b9bceb8e5
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diff
changeset
|
2524 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
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diff
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|
2525 |
f90b9bceb8e5
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|
2526 rp->enqueue_discovered_references(executor); |
3975
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|
2527 |
1847b501ae74
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|
2528 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
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|
2529 assert(!rp->discovery_enabled(), "Post condition"); |
2174
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|
2530 } |
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2152
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|
2531 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2532 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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1974
diff
changeset
|
2533 StringTable::unlink(&g1_is_alive); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2175
diff
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|
2534 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
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parents:
2175
diff
changeset
|
2535 SymbolTable::unlink(); |
342 | 2536 } |
2537 | |
2538 void ConcurrentMark::swapMarkBitMaps() { | |
2539 CMBitMapRO* temp = _prevMarkBitMap; | |
2540 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2541 _nextMarkBitMap = (CMBitMap*) temp; | |
2542 } | |
2543 | |
2544 class CMRemarkTask: public AbstractGangTask { | |
2545 private: | |
8787
fa08949fe0cb
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8744
diff
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|
2546 ConcurrentMark* _cm; |
fa08949fe0cb
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diff
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|
2547 bool _is_serial; |
342 | 2548 public: |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2549 void work(uint worker_id) { |
342 | 2550 // Since all available tasks are actually started, we should |
2551 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
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jmasa
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diff
changeset
|
2552 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
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|
2553 CMTask* task = _cm->task(worker_id); |
342 | 2554 task->record_start_time(); |
2555 do { | |
2174
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2152
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|
2556 task->do_marking_step(1000000000.0 /* something very large */, |
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|
2557 true /* do_termination */, |
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2558 _is_serial); |
342 | 2559 } while (task->has_aborted() && !_cm->has_overflown()); |
2560 // If we overflow, then we do not want to restart. We instead | |
2561 // want to abort remark and do concurrent marking again. | |
2562 task->record_end_time(); | |
2563 } | |
2564 } | |
2565 | |
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2566 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
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2567 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2568 _cm->terminator()->reset_for_reuse(active_workers); |
4095
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2569 } |
342 | 2570 }; |
2571 | |
2572 void ConcurrentMark::checkpointRootsFinalWork() { | |
2573 ResourceMark rm; | |
2574 HandleMark hm; | |
2575 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2576 | |
2577 g1h->ensure_parsability(false); | |
2578 | |
1833
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2579 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2580 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
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2581 // this is remark, so we'll use up all active threads |
4728
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2582 uint active_workers = g1h->workers()->active_workers(); |
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2583 if (active_workers == 0) { |
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2584 assert(active_workers > 0, "Should have been set earlier"); |
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2585 active_workers = (uint) ParallelGCThreads; |
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2586 g1h->workers()->set_active_workers(active_workers); |
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2587 } |
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2588 set_concurrency_and_phase(active_workers, false /* concurrent */); |
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|
2589 // Leave _parallel_marking_threads at it's |
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2590 // value originally calculated in the ConcurrentMark |
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|
2591 // constructor and pass values of the active workers |
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2592 // through the gang in the task. |
342 | 2593 |
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|
2594 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
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2595 // We will start all available threads, even if we decide that the |
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|
2596 // active_workers will be fewer. The extra ones will just bail out |
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2597 // immediately. |
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|
2598 g1h->set_par_threads(active_workers); |
342 | 2599 g1h->workers()->run_task(&remarkTask); |
2600 g1h->set_par_threads(0); | |
2601 } else { | |
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|
2602 G1CollectedHeap::StrongRootsScope srs(g1h); |
4728
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2603 uint active_workers = 1; |
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2604 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2605 |
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|
2606 // Note - if there's no work gang then the VMThread will be |
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|
2607 // the thread to execute the remark - serially. We have |
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|
2608 // to pass true for the is_serial parameter so that |
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|
2609 // CMTask::do_marking_step() doesn't enter the sync |
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|
2610 // barriers in the event of an overflow. Doing so will |
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|
2611 // cause an assert that the current thread is not a |
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|
2612 // concurrent GC thread. |
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|
2613 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2614 remarkTask.work(0); |
2615 } | |
1023
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|
2616 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
8789
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8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
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|
2617 guarantee(has_overflown() || |
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|
2618 satb_mq_set.completed_buffers_num() == 0, |
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|
2619 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
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|
2620 BOOL_TO_STR(has_overflown()), |
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|
2621 satb_mq_set.completed_buffers_num())); |
342 | 2622 |
2623 print_stats(); | |
2624 } | |
2625 | |
1044 | 2626 #ifndef PRODUCT |
2627 | |
1388 | 2628 class PrintReachableOopClosure: public OopClosure { |
342 | 2629 private: |
2630 G1CollectedHeap* _g1h; | |
2631 outputStream* _out; | |
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7004681: G1: Extend marking verification to Full GCs
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|
2632 VerifyOption _vo; |
1388 | 2633 bool _all; |
342 | 2634 |
2635 public: | |
3772
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|
2636 PrintReachableOopClosure(outputStream* out, |
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|
2637 VerifyOption vo, |
1388 | 2638 bool all) : |
1044 | 2639 _g1h(G1CollectedHeap::heap()), |
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|
2640 _out(out), _vo(vo), _all(all) { } |
342 | 2641 |
845
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|
2642 void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
2643 void do_oop( oop* p) { do_oop_work(p); } |
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|
2644 |
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|
2645 template <class T> void do_oop_work(T* p) { |
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|
2646 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2647 const char* str = NULL; |
2648 const char* str2 = ""; | |
2649 | |
1388 | 2650 if (obj == NULL) { |
2651 str = ""; | |
2652 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2653 str = " O"; | |
2654 } else { | |
342 | 2655 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
11d4857fe5e1
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|
2656 guarantee(hr != NULL, "invariant"); |
6254
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|
2657 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2658 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2659 |
2660 if (over_tams) { | |
1388 | 2661 str = " >"; |
2662 if (marked) { | |
342 | 2663 str2 = " AND MARKED"; |
1044 | 2664 } |
1388 | 2665 } else if (marked) { |
2666 str = " M"; | |
1044 | 2667 } else { |
1388 | 2668 str = " NOT"; |
1044 | 2669 } |
342 | 2670 } |
2671 | |
1388 | 2672 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2673 p, (void*) obj, str, str2); |
2674 } | |
2675 }; | |
2676 | |
1388 | 2677 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2678 private: |
3772
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7004681: G1: Extend marking verification to Full GCs
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changeset
|
2679 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
2680 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2681 VerifyOption _vo; |
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7004681: G1: Extend marking verification to Full GCs
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diff
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|
2682 bool _all; |
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7004681: G1: Extend marking verification to Full GCs
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|
2683 HeapRegion* _hr; |
342 | 2684 |
2685 public: | |
3772
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7004681: G1: Extend marking verification to Full GCs
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changeset
|
2686 PrintReachableObjectClosure(outputStream* out, |
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7004681: G1: Extend marking verification to Full GCs
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changeset
|
2687 VerifyOption vo, |
1388 | 2688 bool all, |
2689 HeapRegion* hr) : | |
3772
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7004681: G1: Extend marking verification to Full GCs
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|
2690 _g1h(G1CollectedHeap::heap()), |
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|
2691 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2692 |
2693 void do_object(oop o) { | |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2694 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2695 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2696 bool print_it = _all || over_tams || marked; |
2697 | |
2698 if (print_it) { | |
2699 _out->print_cr(" "PTR_FORMAT"%s", | |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
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12229
diff
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|
2700 (void *)o, (over_tams) ? " >" : (marked) ? " M" : ""); |
3772
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|
2701 PrintReachableOopClosure oopCl(_out, _vo, _all); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
2702 o->oop_iterate_no_header(&oopCl); |
1388 | 2703 } |
342 | 2704 } |
2705 }; | |
2706 | |
1388 | 2707 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2708 private: |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2709 G1CollectedHeap* _g1h; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2710 outputStream* _out; |
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|
2711 VerifyOption _vo; |
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|
2712 bool _all; |
342 | 2713 |
2714 public: | |
2715 bool doHeapRegion(HeapRegion* hr) { | |
2716 HeapWord* b = hr->bottom(); | |
2717 HeapWord* e = hr->end(); | |
2718 HeapWord* t = hr->top(); | |
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|
2719 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2720 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2721 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2722 _out->cr(); |
2723 | |
2724 HeapWord* from = b; | |
2725 HeapWord* to = t; | |
2726 | |
2727 if (to > from) { | |
2728 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2729 _out->cr(); | |
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|
2730 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2731 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2732 _out->cr(); | |
2733 } | |
342 | 2734 |
2735 return false; | |
2736 } | |
2737 | |
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|
2738 PrintReachableRegionClosure(outputStream* out, |
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|
2739 VerifyOption vo, |
1388 | 2740 bool all) : |
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|
2741 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2742 }; |
2743 | |
1388 | 2744 void ConcurrentMark::print_reachable(const char* str, |
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|
2745 VerifyOption vo, |
1388 | 2746 bool all) { |
2747 gclog_or_tty->cr(); | |
2748 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2749 |
2750 if (G1PrintReachableBaseFile == NULL) { | |
2751 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2752 return; | |
2753 } | |
2754 | |
2755 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2756 (JVM_MAXPATHLEN - 1)) { | |
2757 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2758 return; | |
2759 } | |
2760 | |
2761 char file_name[JVM_MAXPATHLEN]; | |
2762 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2763 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2764 | |
2765 fileStream fout(file_name); | |
2766 if (!fout.is_open()) { | |
2767 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2768 return; | |
2769 } | |
2770 | |
2771 outputStream* out = &fout; | |
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|
2772 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2773 out->cr(); |
2774 | |
1388 | 2775 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2776 out->cr(); |
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|
2777 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2778 _g1h->heap_region_iterate(&rcl); |
1044 | 2779 out->cr(); |
2780 | |
2781 gclog_or_tty->print_cr(" done"); | |
1388 | 2782 gclog_or_tty->flush(); |
342 | 2783 } |
2784 | |
1044 | 2785 #endif // PRODUCT |
2786 | |
4787
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|
2787 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2788 // Note we are overriding the read-only view of the prev map here, via |
2789 // the cast. | |
2790 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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|
2791 } |
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|
2792 |
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|
2793 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2794 _nextMarkBitMap->clearRange(mr); |
2795 } | |
2796 | |
4787
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|
2797 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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diff
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|
2798 clearRangePrevBitmap(mr); |
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diff
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|
2799 clearRangeNextBitmap(mr); |
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|
2800 } |
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2801 |
342 | 2802 HeapRegion* |
6862
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2803 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2804 // "checkpoint" the finger |
2805 HeapWord* finger = _finger; | |
2806 | |
2807 // _heap_end will not change underneath our feet; it only changes at | |
2808 // yield points. | |
2809 while (finger < _heap_end) { | |
1023
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2810 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2811 |
3771 | 2812 // Note on how this code handles humongous regions. In the |
2813 // normal case the finger will reach the start of a "starts | |
2814 // humongous" (SH) region. Its end will either be the end of the | |
2815 // last "continues humongous" (CH) region in the sequence, or the | |
2816 // standard end of the SH region (if the SH is the only region in | |
2817 // the sequence). That way claim_region() will skip over the CH | |
2818 // regions. However, there is a subtle race between a CM thread | |
2819 // executing this method and a mutator thread doing a humongous | |
2820 // object allocation. The two are not mutually exclusive as the CM | |
2821 // thread does not need to hold the Heap_lock when it gets | |
2822 // here. So there is a chance that claim_region() will come across | |
2823 // a free region that's in the progress of becoming a SH or a CH | |
2824 // region. In the former case, it will either | |
2825 // a) Miss the update to the region's end, in which case it will | |
2826 // visit every subsequent CH region, will find their bitmaps | |
2827 // empty, and do nothing, or | |
2828 // b) Will observe the update of the region's end (in which case | |
2829 // it will skip the subsequent CH regions). | |
2830 // If it comes across a region that suddenly becomes CH, the | |
2831 // scenario will be similar to b). So, the race between | |
2832 // claim_region() and a humongous object allocation might force us | |
2833 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2834 // iterations) but it should not introduce and correctness issues. | |
2835 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2836 HeapWord* bottom = curr_region->bottom(); |
2837 HeapWord* end = curr_region->end(); | |
2838 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2839 | |
3771 | 2840 if (verbose_low()) { |
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2841 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2842 "["PTR_FORMAT", "PTR_FORMAT"), " |
2843 "limit = "PTR_FORMAT, | |
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2844 worker_id, curr_region, bottom, end, limit); |
3771 | 2845 } |
2846 | |
2847 // Is the gap between reading the finger and doing the CAS too long? | |
2848 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2849 if (res == finger) { |
2850 // we succeeded | |
2851 | |
2852 // notice that _finger == end cannot be guaranteed here since, | |
2853 // someone else might have moved the finger even further | |
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2854 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2855 |
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2856 if (verbose_low()) { |
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2857 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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2858 PTR_FORMAT, worker_id, curr_region); |
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2859 } |
342 | 2860 |
2861 if (limit > bottom) { | |
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2862 if (verbose_low()) { |
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2863 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2864 "returning it ", worker_id, curr_region); |
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2865 } |
342 | 2866 return curr_region; |
2867 } else { | |
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2868 assert(limit == bottom, |
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2869 "the region limit should be at bottom"); |
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2870 if (verbose_low()) { |
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2871 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2872 "returning NULL", worker_id, curr_region); |
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2873 } |
342 | 2874 // we return NULL and the caller should try calling |
2875 // claim_region() again. | |
2876 return NULL; | |
2877 } | |
2878 } else { | |
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2879 assert(_finger > finger, "the finger should have moved forward"); |
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2880 if (verbose_low()) { |
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2881 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 2882 "global finger = "PTR_FORMAT", " |
2883 "our finger = "PTR_FORMAT, | |
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2884 worker_id, _finger, finger); |
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2885 } |
342 | 2886 |
2887 // read it again | |
2888 finger = _finger; | |
2889 } | |
2890 } | |
2891 | |
2892 return NULL; | |
2893 } | |
2894 | |
4787
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2895 #ifndef PRODUCT |
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2896 enum VerifyNoCSetOopsPhase { |
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2897 VerifyNoCSetOopsStack, |
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2898 VerifyNoCSetOopsQueues, |
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2899 VerifyNoCSetOopsSATBCompleted, |
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2900 VerifyNoCSetOopsSATBThread |
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2901 }; |
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2902 |
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2903 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2904 private: |
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2905 G1CollectedHeap* _g1h; |
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2906 VerifyNoCSetOopsPhase _phase; |
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2907 int _info; |
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2908 |
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2909 const char* phase_str() { |
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2910 switch (_phase) { |
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2911 case VerifyNoCSetOopsStack: return "Stack"; |
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2912 case VerifyNoCSetOopsQueues: return "Queue"; |
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2913 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2914 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2915 default: ShouldNotReachHere(); |
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2916 } |
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2917 return NULL; |
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2918 } |
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2919 |
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2920 void do_object_work(oop obj) { |
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2921 guarantee(!_g1h->obj_in_cs(obj), |
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2922 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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2923 (void*) obj, phase_str(), _info)); |
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2924 } |
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2925 |
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|
2926 public: |
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2927 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2928 |
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2929 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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2930 _phase = phase; |
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2931 _info = info; |
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|
2932 } |
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2933 |
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2934 virtual void do_oop(oop* p) { |
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2935 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2936 do_object_work(obj); |
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|
2937 } |
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|
2938 |
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2939 virtual void do_oop(narrowOop* p) { |
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2940 // We should not come across narrow oops while scanning marking |
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2941 // stacks and SATB buffers. |
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|
2942 ShouldNotReachHere(); |
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|
2943 } |
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2944 |
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2945 virtual void do_object(oop obj) { |
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2946 do_object_work(obj); |
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|
2947 } |
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2948 }; |
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2949 |
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2950 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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2951 bool verify_enqueued_buffers, |
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|
2952 bool verify_thread_buffers, |
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|
2953 bool verify_fingers) { |
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|
2954 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2955 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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2956 return; |
342 | 2957 } |
1835
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|
2958 |
4787
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2959 VerifyNoCSetOopsClosure cl; |
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2960 |
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|
2961 if (verify_stacks) { |
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|
2962 // Verify entries on the global mark stack |
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|
2963 cl.set_phase(VerifyNoCSetOopsStack); |
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2964 _markStack.oops_do(&cl); |
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2965 |
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|
2966 // Verify entries on the task queues |
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2967 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
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2968 cl.set_phase(VerifyNoCSetOopsQueues, i); |
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|
2969 CMTaskQueue* queue = _task_queues->queue(i); |
4787
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|
2970 queue->oops_do(&cl); |
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|
2971 } |
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|
2972 } |
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|
2973 |
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2974 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
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2975 |
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|
2976 // Verify entries on the enqueued SATB buffers |
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|
2977 if (verify_enqueued_buffers) { |
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|
2978 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
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diff
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|
2979 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
2980 } |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
2981 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2982 // 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
|
2983 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2984 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2985 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2986 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2987 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2988 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2989 // Verify the global finger |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2990 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2991 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
|
2992 // 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
|
2993 // 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
|
2994 // 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
|
2995 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2996 // 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
|
2997 // 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
|
2998 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2999 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
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|
3000 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3001 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3002 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3003 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3004 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3005 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3006 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
|
3007 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
|
3008 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3009 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3010 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
|
3011 // 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
|
3012 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
|
3013 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3014 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3015 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3016 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3017 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3018 } |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3019 } |
342 | 3020 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3021 #endif // PRODUCT |
342 | 3022 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3023 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3024 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3025 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3026 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3027 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3028 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3029 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3030 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3031 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3032 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3033 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3034 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3035 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3036 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3037 _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
|
3038 _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
|
3039 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3040 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3041 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3042 // 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
|
3043 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3044 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3045 // "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
|
3046 // 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
|
3047 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3049 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3050 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3051 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3052 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3054 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3055 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3056 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
|
3057 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3058 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3059 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3060 start, limit, hr->top(), hr->end())); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3061 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3062 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3063 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3064 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3065 // 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
|
3066 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3067 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3068 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3069 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3070 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
|
3071 // '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
|
3072 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
|
3073 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3074 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
|
3075 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
|
3076 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
|
3077 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3078 // 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
|
3079 // 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
|
3080 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3081 // 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
|
3082 // 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
|
3083 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3084 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3085 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
|
3086 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3087 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3088 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3089 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3090 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3091 // 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
|
3092 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3093 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3094 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3095 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
|
3096 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
|
3097 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
|
3098 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3099 // 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
|
3100 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3101 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3102 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3103 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
4836
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|
3104 // into the global card bitmap. |
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|
3105 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
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|
3106 |
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|
3107 while (scan_idx < limit_idx) { |
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|
3108 assert(task_card_bm->at(scan_idx) == true, "should be"); |
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|
3109 _cm_card_bm->set_bit(scan_idx); |
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|
3110 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
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|
3111 |
d30fa85f9994
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|
3112 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
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|
3113 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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diff
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|
3114 // parameter. It does, however, have an early exit if |
4836
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|
3115 // left_offset == right_offset. So let's limit the value |
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|
3116 // passed in for left offset here. |
d30fa85f9994
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|
3117 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
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|
3118 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
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|
3119 } |
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changeset
|
3120 } |
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changeset
|
3121 |
d30fa85f9994
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diff
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|
3122 // Update the marked bytes for this region. |
d30fa85f9994
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|
3123 hr->add_to_marked_bytes(marked_bytes); |
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|
3124 |
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diff
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|
3125 // Next heap region |
d30fa85f9994
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|
3126 return false; |
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|
3127 } |
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|
3128 }; |
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|
3129 |
d30fa85f9994
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|
3130 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
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|
3131 protected: |
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|
3132 G1CollectedHeap* _g1h; |
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|
3133 ConcurrentMark* _cm; |
d30fa85f9994
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|
3134 BitMap* _cm_card_bm; |
6862
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|
3135 uint _max_worker_id; |
4836
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|
3136 int _active_workers; |
d30fa85f9994
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|
3137 |
d30fa85f9994
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|
3138 public: |
d30fa85f9994
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|
3139 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
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|
3140 ConcurrentMark* cm, |
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|
3141 BitMap* cm_card_bm, |
6862
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|
3142 uint max_worker_id, |
4836
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|
3143 int n_workers) : |
d30fa85f9994
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|
3144 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
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|
3145 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
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|
3146 _max_worker_id(max_worker_id), |
4836
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|
3147 _active_workers(n_workers) { } |
d30fa85f9994
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|
3148 |
d30fa85f9994
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|
3149 void work(uint worker_id) { |
6862
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|
3150 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
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|
3151 |
d30fa85f9994
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diff
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|
3152 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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|
3153 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
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|
3154 _active_workers, |
d30fa85f9994
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|
3155 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
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|
3156 } else { |
d30fa85f9994
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|
3157 _g1h->heap_region_iterate(&cl); |
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|
3158 } |
d30fa85f9994
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parents:
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diff
changeset
|
3159 } |
d30fa85f9994
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diff
changeset
|
3160 }; |
d30fa85f9994
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diff
changeset
|
3161 |
d30fa85f9994
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changeset
|
3162 |
d30fa85f9994
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diff
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|
3163 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
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diff
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|
3164 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
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|
3165 _g1h->workers()->active_workers() : |
d30fa85f9994
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diff
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|
3166 1); |
d30fa85f9994
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diff
changeset
|
3167 |
d30fa85f9994
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diff
changeset
|
3168 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
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|
3169 _max_worker_id, n_workers); |
4836
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|
3170 |
d30fa85f9994
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diff
changeset
|
3171 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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diff
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|
3172 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
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diff
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|
3173 "sanity check"); |
d30fa85f9994
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|
3174 _g1h->set_par_threads(n_workers); |
d30fa85f9994
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|
3175 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
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|
3176 _g1h->set_par_threads(0); |
d30fa85f9994
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diff
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|
3177 |
d30fa85f9994
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diff
changeset
|
3178 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
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diff
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|
3179 "sanity check"); |
d30fa85f9994
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diff
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|
3180 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
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|
3181 } else { |
d30fa85f9994
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diff
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|
3182 g1_par_agg_task.work(0); |
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diff
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|
3183 } |
d30fa85f9994
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diff
changeset
|
3184 } |
d30fa85f9994
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diff
changeset
|
3185 |
d30fa85f9994
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diff
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|
3186 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
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|
3187 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
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|
3188 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
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diff
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|
3189 // liveness count aggregation (during remark) and the |
d30fa85f9994
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diff
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|
3190 // final counting task. |
d30fa85f9994
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diff
changeset
|
3191 _card_bm.clear(); |
d30fa85f9994
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diff
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|
3192 |
d30fa85f9994
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diff
changeset
|
3193 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
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diff
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|
3194 // of the final counting task. |
d30fa85f9994
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diff
changeset
|
3195 _region_bm.clear(); |
d30fa85f9994
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diff
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|
3196 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
3197 uint max_regions = _g1h->max_regions(); |
6862
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|
3198 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
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diff
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|
3199 |
8a5ea0a9ccc4
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diff
changeset
|
3200 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
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|
3201 BitMap* task_card_bm = count_card_bitmap_for(i); |
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|
3202 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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|
3203 |
d30fa85f9994
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diff
changeset
|
3204 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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|
3205 assert(marked_bytes_array != NULL, "uninitialized"); |
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|
3206 |
6010
720b6a76dd9d
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6008
diff
changeset
|
3207 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
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|
3208 task_card_bm->clear(); |
d30fa85f9994
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changeset
|
3209 } |
d30fa85f9994
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|
3210 } |
d30fa85f9994
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|
3211 |
342 | 3212 void ConcurrentMark::print_stats() { |
3213 if (verbose_stats()) { | |
3214 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3215 for (size_t i = 0; i < _active_tasks; ++i) { | |
3216 _tasks[i]->print_stats(); | |
3217 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3218 } | |
3219 } | |
3220 } | |
3221 | |
3222 // abandon current marking iteration due to a Full GC | |
3223 void ConcurrentMark::abort() { | |
3224 // Clear all marks to force marking thread to do nothing | |
3225 _nextMarkBitMap->clearAll(); | |
4836
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|
3226 // Clear the liveness counting data |
d30fa85f9994
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|
3227 clear_all_count_data(); |
342 | 3228 // Empty mark stack |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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7397
diff
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|
3229 reset_marking_state(); |
6862
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|
3230 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3231 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
3232 } |
342 | 3233 _has_aborted = true; |
3234 | |
3235 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3236 satb_mq_set.abandon_partial_marking(); | |
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
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1314
diff
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|
3237 // This can be called either during or outside marking, we'll read |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
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diff
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|
3238 // the expected_active value from the SATB queue set. |
d4197f8d516a
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1314
diff
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|
3239 satb_mq_set.set_active_all_threads( |
d4197f8d516a
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1314
diff
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|
3240 false, /* new active value */ |
d4197f8d516a
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1314
diff
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|
3241 satb_mq_set.is_active() /* expected_active */); |
10405 | 3242 |
3243 _g1h->trace_heap_after_concurrent_cycle(); | |
3244 _g1h->register_concurrent_cycle_end(); | |
342 | 3245 } |
3246 | |
3247 static void print_ms_time_info(const char* prefix, const char* name, | |
3248 NumberSeq& ns) { | |
3249 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3250 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3251 if (ns.num() > 0) { | |
3252 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3253 prefix, ns.sd(), ns.maximum()); | |
3254 } | |
3255 } | |
3256 | |
3257 void ConcurrentMark::print_summary_info() { | |
3258 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3259 print_ms_time_info(" ", "init marks", _init_times); | |
3260 print_ms_time_info(" ", "remarks", _remark_times); | |
3261 { | |
3262 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3263 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3264 | |
3265 } | |
3266 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3267 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3268 _total_counting_time, | |
3269 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3270 (double)_cleanup_times.num() | |
3271 : 0.0)); | |
3272 if (G1ScrubRemSets) { | |
3273 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3274 _total_rs_scrub_time, | |
3275 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3276 (double)_cleanup_times.num() | |
3277 : 0.0)); | |
3278 } | |
3279 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3280 (_init_times.sum() + _remark_times.sum() + | |
3281 _cleanup_times.sum())/1000.0); | |
3282 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3283 "(%8.2f s marking).", |
342 | 3284 cmThread()->vtime_accum(), |
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3285 cmThread()->vtime_mark_accum()); |
342 | 3286 } |
3287 | |
1019 | 3288 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
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3289 if (use_parallel_marking_threads()) { |
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3290 _parallel_workers->print_worker_threads_on(st); |
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3291 } |
1019 | 3292 } |
3293 | |
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3294 void ConcurrentMark::print_on_error(outputStream* st) const { |
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3295 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
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3296 _prevMarkBitMap, _nextMarkBitMap); |
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3297 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
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3298 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
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3299 } |
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3300 |
342 | 3301 // We take a break if someone is trying to stop the world. |
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3302 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3303 if (should_yield()) { |
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3304 if (worker_id == 0) { |
342 | 3305 _g1h->g1_policy()->record_concurrent_pause(); |
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3306 } |
342 | 3307 cmThread()->yield(); |
3308 return true; | |
3309 } else { | |
3310 return false; | |
3311 } | |
3312 } | |
3313 | |
3314 bool ConcurrentMark::should_yield() { | |
3315 return cmThread()->should_yield(); | |
3316 } | |
3317 | |
3318 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3319 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3320 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3321 } | |
3322 | |
3323 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3324 void* last) { | |
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3325 return containing_card_is_marked(start) && |
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3326 containing_card_is_marked(last); |
342 | 3327 } |
3328 | |
3329 #ifndef PRODUCT | |
3330 // for debugging purposes | |
3331 void ConcurrentMark::print_finger() { | |
3332 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3333 _heap_start, _heap_end, _finger); | |
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3334 for (uint i = 0; i < _max_worker_id; ++i) { |
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3335 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
342 | 3336 } |
3337 gclog_or_tty->print_cr(""); | |
3338 } | |
3339 #endif | |
3340 | |
3771 | 3341 void CMTask::scan_object(oop obj) { |
3342 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3343 | |
3344 if (_cm->verbose_high()) { | |
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3345 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
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3346 _worker_id, (void*) obj); |
3771 | 3347 } |
3348 | |
3349 size_t obj_size = obj->size(); | |
3350 _words_scanned += obj_size; | |
3351 | |
3352 obj->oop_iterate(_cm_oop_closure); | |
3353 statsOnly( ++_objs_scanned ); | |
3354 check_limits(); | |
3355 } | |
3356 | |
342 | 3357 // Closure for iteration over bitmaps |
3358 class CMBitMapClosure : public BitMapClosure { | |
3359 private: | |
3360 // the bitmap that is being iterated over | |
3361 CMBitMap* _nextMarkBitMap; | |
3362 ConcurrentMark* _cm; | |
3363 CMTask* _task; | |
3364 | |
3365 public: | |
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3366 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3367 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3368 |
3369 bool do_bit(size_t offset) { | |
3370 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3371 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3372 assert( addr < _cm->finger(), "invariant"); |
342 | 3373 |
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3374 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3375 assert(addr >= _task->finger(), "invariant"); |
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3376 |
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3377 // We move that task's local finger along. |
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3378 _task->move_finger_to(addr); |
342 | 3379 |
3380 _task->scan_object(oop(addr)); | |
3381 // we only partially drain the local queue and global stack | |
3382 _task->drain_local_queue(true); | |
3383 _task->drain_global_stack(true); | |
3384 | |
3385 // if the has_aborted flag has been raised, we need to bail out of | |
3386 // the iteration | |
3387 return !_task->has_aborted(); | |
3388 } | |
3389 }; | |
3390 | |
3391 // Closure for iterating over objects, currently only used for | |
3392 // processing SATB buffers. | |
3393 class CMObjectClosure : public ObjectClosure { | |
3394 private: | |
3395 CMTask* _task; | |
3396 | |
3397 public: | |
3398 void do_object(oop obj) { | |
3399 _task->deal_with_reference(obj); | |
3400 } | |
3401 | |
3402 CMObjectClosure(CMTask* task) : _task(task) { } | |
3403 }; | |
3404 | |
3771 | 3405 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3406 ConcurrentMark* cm, | |
3407 CMTask* task) | |
3408 : _g1h(g1h), _cm(cm), _task(task) { | |
3409 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3410 | |
3411 if (G1UseConcMarkReferenceProcessing) { | |
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3412 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3413 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3414 } |
3771 | 3415 } |
342 | 3416 |
3417 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3418 // Separated the asserts so that we know which one fires. |
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3419 assert(hr != NULL, |
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3420 "claim_region() should have filtered out continues humongous regions"); |
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3421 assert(!hr->continuesHumongous(), |
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3422 "claim_region() should have filtered out continues humongous regions"); |
342 | 3423 |
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3424 if (_cm->verbose_low()) { |
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3425 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3426 _worker_id, hr); |
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3427 } |
342 | 3428 |
3429 _curr_region = hr; | |
3430 _finger = hr->bottom(); | |
3431 update_region_limit(); | |
3432 } | |
3433 | |
3434 void CMTask::update_region_limit() { | |
3435 HeapRegion* hr = _curr_region; | |
3436 HeapWord* bottom = hr->bottom(); | |
3437 HeapWord* limit = hr->next_top_at_mark_start(); | |
3438 | |
3439 if (limit == bottom) { | |
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3440 if (_cm->verbose_low()) { |
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3441 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3442 "["PTR_FORMAT", "PTR_FORMAT")", |
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3443 _worker_id, bottom, limit); |
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3444 } |
342 | 3445 // The region was collected underneath our feet. |
3446 // We set the finger to bottom to ensure that the bitmap | |
3447 // iteration that will follow this will not do anything. | |
3448 // (this is not a condition that holds when we set the region up, | |
3449 // as the region is not supposed to be empty in the first place) | |
3450 _finger = bottom; | |
3451 } else if (limit >= _region_limit) { | |
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3452 assert(limit >= _finger, "peace of mind"); |
342 | 3453 } else { |
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3454 assert(limit < _region_limit, "only way to get here"); |
342 | 3455 // This can happen under some pretty unusual circumstances. An |
3456 // evacuation pause empties the region underneath our feet (NTAMS | |
3457 // at bottom). We then do some allocation in the region (NTAMS | |
3458 // stays at bottom), followed by the region being used as a GC | |
3459 // alloc region (NTAMS will move to top() and the objects | |
3460 // originally below it will be grayed). All objects now marked in | |
3461 // the region are explicitly grayed, if below the global finger, | |
3462 // and we do not need in fact to scan anything else. So, we simply | |
3463 // set _finger to be limit to ensure that the bitmap iteration | |
3464 // doesn't do anything. | |
3465 _finger = limit; | |
3466 } | |
3467 | |
3468 _region_limit = limit; | |
3469 } | |
3470 | |
3471 void CMTask::giveup_current_region() { | |
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3472 assert(_curr_region != NULL, "invariant"); |
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3473 if (_cm->verbose_low()) { |
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3474 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3475 _worker_id, _curr_region); |
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3476 } |
342 | 3477 clear_region_fields(); |
3478 } | |
3479 | |
3480 void CMTask::clear_region_fields() { | |
3481 // Values for these three fields that indicate that we're not | |
3482 // holding on to a region. | |
3483 _curr_region = NULL; | |
3484 _finger = NULL; | |
3485 _region_limit = NULL; | |
3486 } | |
3487 | |
3771 | 3488 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3489 if (cm_oop_closure == NULL) { | |
3490 assert(_cm_oop_closure != NULL, "invariant"); | |
3491 } else { | |
3492 assert(_cm_oop_closure == NULL, "invariant"); | |
3493 } | |
3494 _cm_oop_closure = cm_oop_closure; | |
3495 } | |
3496 | |
342 | 3497 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3498 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3499 |
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3500 if (_cm->verbose_low()) { |
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3501 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3502 } |
342 | 3503 |
3504 _nextMarkBitMap = nextMarkBitMap; | |
3505 clear_region_fields(); | |
3506 | |
3507 _calls = 0; | |
3508 _elapsed_time_ms = 0.0; | |
3509 _termination_time_ms = 0.0; | |
3510 _termination_start_time_ms = 0.0; | |
3511 | |
3512 #if _MARKING_STATS_ | |
3513 _local_pushes = 0; | |
3514 _local_pops = 0; | |
3515 _local_max_size = 0; | |
3516 _objs_scanned = 0; | |
3517 _global_pushes = 0; | |
3518 _global_pops = 0; | |
3519 _global_max_size = 0; | |
3520 _global_transfers_to = 0; | |
3521 _global_transfers_from = 0; | |
3522 _regions_claimed = 0; | |
3523 _objs_found_on_bitmap = 0; | |
3524 _satb_buffers_processed = 0; | |
3525 _steal_attempts = 0; | |
3526 _steals = 0; | |
3527 _aborted = 0; | |
3528 _aborted_overflow = 0; | |
3529 _aborted_cm_aborted = 0; | |
3530 _aborted_yield = 0; | |
3531 _aborted_timed_out = 0; | |
3532 _aborted_satb = 0; | |
3533 _aborted_termination = 0; | |
3534 #endif // _MARKING_STATS_ | |
3535 } | |
3536 | |
3537 bool CMTask::should_exit_termination() { | |
3538 regular_clock_call(); | |
3539 // This is called when we are in the termination protocol. We should | |
3540 // quit if, for some reason, this task wants to abort or the global | |
3541 // stack is not empty (this means that we can get work from it). | |
3542 return !_cm->mark_stack_empty() || has_aborted(); | |
3543 } | |
3544 | |
3545 void CMTask::reached_limit() { | |
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3546 assert(_words_scanned >= _words_scanned_limit || |
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3547 _refs_reached >= _refs_reached_limit , |
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3548 "shouldn't have been called otherwise"); |
342 | 3549 regular_clock_call(); |
3550 } | |
3551 | |
3552 void CMTask::regular_clock_call() { | |
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3553 if (has_aborted()) return; |
342 | 3554 |
3555 // First, we need to recalculate the words scanned and refs reached | |
3556 // limits for the next clock call. | |
3557 recalculate_limits(); | |
3558 | |
3559 // During the regular clock call we do the following | |
3560 | |
3561 // (1) If an overflow has been flagged, then we abort. | |
3562 if (_cm->has_overflown()) { | |
3563 set_has_aborted(); | |
3564 return; | |
3565 } | |
3566 | |
3567 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3568 // to check anything else. The other steps are only needed during | |
3569 // the concurrent marking phase. | |
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3570 if (!concurrent()) return; |
342 | 3571 |
3572 // (2) If marking has been aborted for Full GC, then we also abort. | |
3573 if (_cm->has_aborted()) { | |
3574 set_has_aborted(); | |
3575 statsOnly( ++_aborted_cm_aborted ); | |
3576 return; | |
3577 } | |
3578 | |
3579 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3580 | |
3581 // (3) If marking stats are enabled, then we update the step history. | |
3582 #if _MARKING_STATS_ | |
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3583 if (_words_scanned >= _words_scanned_limit) { |
342 | 3584 ++_clock_due_to_scanning; |
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3585 } |
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3586 if (_refs_reached >= _refs_reached_limit) { |
342 | 3587 ++_clock_due_to_marking; |
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3588 } |
342 | 3589 |
3590 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3591 _interval_start_time_ms = curr_time_ms; | |
3592 _all_clock_intervals_ms.add(last_interval_ms); | |
3593 | |
3594 if (_cm->verbose_medium()) { | |
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3595 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
3776
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3596 "scanned = %d%s, refs reached = %d%s", |
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3597 _worker_id, last_interval_ms, |
3776
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3598 _words_scanned, |
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3599 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3600 _refs_reached, |
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3601 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3602 } |
3603 #endif // _MARKING_STATS_ | |
3604 | |
3605 // (4) We check whether we should yield. If we have to, then we abort. | |
3606 if (_cm->should_yield()) { | |
3607 // We should yield. To do this we abort the task. The caller is | |
3608 // responsible for yielding. | |
3609 set_has_aborted(); | |
3610 statsOnly( ++_aborted_yield ); | |
3611 return; | |
3612 } | |
3613 | |
3614 // (5) We check whether we've reached our time quota. If we have, | |
3615 // then we abort. | |
3616 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3617 if (elapsed_time_ms > _time_target_ms) { | |
3618 set_has_aborted(); | |
2174
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3619 _has_timed_out = true; |
342 | 3620 statsOnly( ++_aborted_timed_out ); |
3621 return; | |
3622 } | |
3623 | |
3624 // (6) Finally, we check whether there are enough completed STAB | |
3625 // buffers available for processing. If there are, we abort. | |
3626 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3627 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3628 if (_cm->verbose_low()) { |
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3629 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3630 _worker_id); |
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3631 } |
342 | 3632 // we do need to process SATB buffers, we'll abort and restart |
3633 // the marking task to do so | |
3634 set_has_aborted(); | |
3635 statsOnly( ++_aborted_satb ); | |
3636 return; | |
3637 } | |
3638 } | |
3639 | |
3640 void CMTask::recalculate_limits() { | |
3641 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3642 _words_scanned_limit = _real_words_scanned_limit; | |
3643 | |
3644 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3645 _refs_reached_limit = _real_refs_reached_limit; | |
3646 } | |
3647 | |
3648 void CMTask::decrease_limits() { | |
3649 // This is called when we believe that we're going to do an infrequent | |
3650 // operation which will increase the per byte scanned cost (i.e. move | |
3651 // entries to/from the global stack). It basically tries to decrease the | |
3652 // scanning limit so that the clock is called earlier. | |
3653 | |
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|
3654 if (_cm->verbose_medium()) { |
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3655 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3656 } |
342 | 3657 |
3658 _words_scanned_limit = _real_words_scanned_limit - | |
3659 3 * words_scanned_period / 4; | |
3660 _refs_reached_limit = _real_refs_reached_limit - | |
3661 3 * refs_reached_period / 4; | |
3662 } | |
3663 | |
3664 void CMTask::move_entries_to_global_stack() { | |
3665 // local array where we'll store the entries that will be popped | |
3666 // from the local queue | |
3667 oop buffer[global_stack_transfer_size]; | |
3668 | |
3669 int n = 0; | |
3670 oop obj; | |
3671 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3672 buffer[n] = obj; | |
3673 ++n; | |
3674 } | |
3675 | |
3676 if (n > 0) { | |
3677 // we popped at least one entry from the local queue | |
3678 | |
3679 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3680 | |
3681 if (!_cm->mark_stack_push(buffer, n)) { | |
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3682 if (_cm->verbose_low()) { |
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3683 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3684 _worker_id); |
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|
3685 } |
342 | 3686 set_has_aborted(); |
3687 } else { | |
3688 // the transfer was successful | |
3689 | |
3776
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3690 if (_cm->verbose_medium()) { |
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3691 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3692 _worker_id, n); |
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3693 } |
342 | 3694 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3695 if (tmp_size > _global_max_size) { |
342 | 3696 _global_max_size = tmp_size; |
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3697 } |
342 | 3698 _global_pushes += n ); |
3699 } | |
3700 } | |
3701 | |
3702 // this operation was quite expensive, so decrease the limits | |
3703 decrease_limits(); | |
3704 } | |
3705 | |
3706 void CMTask::get_entries_from_global_stack() { | |
3707 // local array where we'll store the entries that will be popped | |
3708 // from the global stack. | |
3709 oop buffer[global_stack_transfer_size]; | |
3710 int n; | |
3711 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3712 assert(n <= global_stack_transfer_size, |
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3713 "we should not pop more than the given limit"); |
342 | 3714 if (n > 0) { |
3715 // yes, we did actually pop at least one entry | |
3716 | |
3717 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3718 if (_cm->verbose_medium()) { |
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3719 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3720 _worker_id, n); |
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3721 } |
342 | 3722 for (int i = 0; i < n; ++i) { |
3723 bool success = _task_queue->push(buffer[i]); | |
3724 // We only call this when the local queue is empty or under a | |
3725 // given target limit. So, we do not expect this push to fail. | |
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3726 assert(success, "invariant"); |
342 | 3727 } |
3728 | |
3729 statsOnly( int tmp_size = _task_queue->size(); | |
3776
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3730 if (tmp_size > _local_max_size) { |
342 | 3731 _local_max_size = tmp_size; |
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|
3732 } |
342 | 3733 _local_pushes += n ); |
3734 } | |
3735 | |
3736 // this operation was quite expensive, so decrease the limits | |
3737 decrease_limits(); | |
3738 } | |
3739 | |
3740 void CMTask::drain_local_queue(bool partially) { | |
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3741 if (has_aborted()) return; |
342 | 3742 |
3743 // Decide what the target size is, depending whether we're going to | |
3744 // drain it partially (so that other tasks can steal if they run out | |
3745 // of things to do) or totally (at the very end). | |
3746 size_t target_size; | |
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|
3747 if (partially) { |
342 | 3748 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
3776
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3749 } else { |
342 | 3750 target_size = 0; |
3776
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3751 } |
342 | 3752 |
3753 if (_task_queue->size() > target_size) { | |
3776
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|
3754 if (_cm->verbose_high()) { |
6862
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|
3755 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
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|
3756 _worker_id, target_size); |
3776
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|
3757 } |
342 | 3758 |
3759 oop obj; | |
3760 bool ret = _task_queue->pop_local(obj); | |
3761 while (ret) { | |
3762 statsOnly( ++_local_pops ); | |
3763 | |
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|
3764 if (_cm->verbose_high()) { |
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|
3765 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
342 | 3766 (void*) obj); |
3776
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|
3767 } |
342 | 3768 |
1023
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changeset
|
3769 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3770 assert(!_g1h->is_on_master_free_list( |
2152 | 3771 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3772 |
3773 scan_object(obj); | |
3774 | |
3776
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|
3775 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3776 ret = false; |
3776
23d434c6290d
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|
3777 } else { |
342 | 3778 ret = _task_queue->pop_local(obj); |
3776
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3779 } |
342 | 3780 } |
3781 | |
3776
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|
3782 if (_cm->verbose_high()) { |
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|
3783 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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|
3784 _worker_id, _task_queue->size()); |
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|
3785 } |
342 | 3786 } |
3787 } | |
3788 | |
3789 void CMTask::drain_global_stack(bool partially) { | |
3776
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|
3790 if (has_aborted()) return; |
342 | 3791 |
3792 // We have a policy to drain the local queue before we attempt to | |
3793 // drain the global stack. | |
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|
3794 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3795 |
3796 // Decide what the target size is, depending whether we're going to | |
3797 // drain it partially (so that other tasks can steal if they run out | |
3798 // of things to do) or totally (at the very end). Notice that, | |
3799 // because we move entries from the global stack in chunks or | |
3800 // because another task might be doing the same, we might in fact | |
3801 // drop below the target. But, this is not a problem. | |
3802 size_t target_size; | |
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|
3803 if (partially) { |
342 | 3804 target_size = _cm->partial_mark_stack_size_target(); |
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3805 } else { |
342 | 3806 target_size = 0; |
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|
3807 } |
342 | 3808 |
3809 if (_cm->mark_stack_size() > target_size) { | |
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|
3810 if (_cm->verbose_low()) { |
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|
3811 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
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|
3812 _worker_id, target_size); |
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|
3813 } |
342 | 3814 |
3815 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3816 get_entries_from_global_stack(); | |
3817 drain_local_queue(partially); | |
3818 } | |
3819 | |
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|
3820 if (_cm->verbose_low()) { |
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|
3821 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
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3822 _worker_id, _cm->mark_stack_size()); |
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3823 } |
342 | 3824 } |
3825 } | |
3826 | |
3827 // SATB Queue has several assumptions on whether to call the par or | |
3828 // non-par versions of the methods. this is why some of the code is | |
3829 // replicated. We should really get rid of the single-threaded version | |
3830 // of the code to simplify things. | |
3831 void CMTask::drain_satb_buffers() { | |
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|
3832 if (has_aborted()) return; |
342 | 3833 |
3834 // We set this so that the regular clock knows that we're in the | |
3835 // middle of draining buffers and doesn't set the abort flag when it | |
3836 // notices that SATB buffers are available for draining. It'd be | |
3837 // very counter productive if it did that. :-) | |
3838 _draining_satb_buffers = true; | |
3839 | |
3840 CMObjectClosure oc(this); | |
3841 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3842 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3843 satb_mq_set.set_par_closure(_worker_id, &oc); |
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|
3844 } else { |
342 | 3845 satb_mq_set.set_closure(&oc); |
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|
3846 } |
342 | 3847 |
3848 // This keeps claiming and applying the closure to completed buffers | |
3849 // until we run out of buffers or we need to abort. | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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|
3850 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3851 while (!has_aborted() && |
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|
3852 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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3853 if (_cm->verbose_medium()) { |
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3854 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3855 } |
342 | 3856 statsOnly( ++_satb_buffers_processed ); |
3857 regular_clock_call(); | |
3858 } | |
3859 } else { | |
3860 while (!has_aborted() && | |
3861 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3862 if (_cm->verbose_medium()) { |
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3863 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3864 } |
342 | 3865 statsOnly( ++_satb_buffers_processed ); |
3866 regular_clock_call(); | |
3867 } | |
3868 } | |
3869 | |
3870 if (!concurrent() && !has_aborted()) { | |
3871 // We should only do this during remark. | |
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3872 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3873 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
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3874 } else { |
342 | 3875 satb_mq_set.iterate_closure_all_threads(); |
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3876 } |
342 | 3877 } |
3878 | |
3879 _draining_satb_buffers = false; | |
3880 | |
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3881 assert(has_aborted() || |
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3882 concurrent() || |
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3883 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3884 |
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3885 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3886 satb_mq_set.set_par_closure(_worker_id, NULL); |
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3887 } else { |
342 | 3888 satb_mq_set.set_closure(NULL); |
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3889 } |
342 | 3890 |
3891 // again, this was a potentially expensive operation, decrease the | |
3892 // limits to get the regular clock call early | |
3893 decrease_limits(); | |
3894 } | |
3895 | |
3896 void CMTask::print_stats() { | |
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3897 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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3898 _worker_id, _calls); |
342 | 3899 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
3900 _elapsed_time_ms, _termination_time_ms); | |
3901 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3902 _step_times_ms.num(), _step_times_ms.avg(), | |
3903 _step_times_ms.sd()); | |
3904 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3905 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3906 | |
3907 #if _MARKING_STATS_ | |
3908 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3909 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3910 _all_clock_intervals_ms.sd()); | |
3911 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3912 _all_clock_intervals_ms.maximum(), | |
3913 _all_clock_intervals_ms.sum()); | |
3914 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3915 _clock_due_to_scanning, _clock_due_to_marking); | |
3916 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3917 _objs_scanned, _objs_found_on_bitmap); | |
3918 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3919 _local_pushes, _local_pops, _local_max_size); | |
3920 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3921 _global_pushes, _global_pops, _global_max_size); | |
3922 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3923 _global_transfers_to,_global_transfers_from); | |
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3924 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3925 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3926 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3927 _steal_attempts, _steals); | |
3928 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3929 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3930 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3931 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3932 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3933 #endif // _MARKING_STATS_ | |
3934 } | |
3935 | |
3936 /***************************************************************************** | |
3937 | |
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3938 The do_marking_step(time_target_ms, ...) method is the building |
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3939 block of the parallel marking framework. It can be called in parallel |
342 | 3940 with other invocations of do_marking_step() on different tasks |
3941 (but only one per task, obviously) and concurrently with the | |
3942 mutator threads, or during remark, hence it eliminates the need | |
3943 for two versions of the code. When called during remark, it will | |
3944 pick up from where the task left off during the concurrent marking | |
3945 phase. Interestingly, tasks are also claimable during evacuation | |
3946 pauses too, since do_marking_step() ensures that it aborts before | |
3947 it needs to yield. | |
3948 | |
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3949 The data structures that it uses to do marking work are the |
342 | 3950 following: |
3951 | |
3952 (1) Marking Bitmap. If there are gray objects that appear only | |
3953 on the bitmap (this happens either when dealing with an overflow | |
3954 or when the initial marking phase has simply marked the roots | |
3955 and didn't push them on the stack), then tasks claim heap | |
3956 regions whose bitmap they then scan to find gray objects. A | |
3957 global finger indicates where the end of the last claimed region | |
3958 is. A local finger indicates how far into the region a task has | |
3959 scanned. The two fingers are used to determine how to gray an | |
3960 object (i.e. whether simply marking it is OK, as it will be | |
3961 visited by a task in the future, or whether it needs to be also | |
3962 pushed on a stack). | |
3963 | |
3964 (2) Local Queue. The local queue of the task which is accessed | |
3965 reasonably efficiently by the task. Other tasks can steal from | |
3966 it when they run out of work. Throughout the marking phase, a | |
3967 task attempts to keep its local queue short but not totally | |
3968 empty, so that entries are available for stealing by other | |
3969 tasks. Only when there is no more work, a task will totally | |
3970 drain its local queue. | |
3971 | |
3972 (3) Global Mark Stack. This handles local queue overflow. During | |
3973 marking only sets of entries are moved between it and the local | |
3974 queues, as access to it requires a mutex and more fine-grain | |
3975 interaction with it which might cause contention. If it | |
3976 overflows, then the marking phase should restart and iterate | |
3977 over the bitmap to identify gray objects. Throughout the marking | |
3978 phase, tasks attempt to keep the global mark stack at a small | |
3979 length but not totally empty, so that entries are available for | |
3980 popping by other tasks. Only when there is no more work, tasks | |
3981 will totally drain the global mark stack. | |
3982 | |
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3983 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 3984 made available. Buffers are regularly removed from this queue |
3985 and scanned for roots, so that the queue doesn't get too | |
3986 long. During remark, all completed buffers are processed, as | |
3987 well as the filled in parts of any uncompleted buffers. | |
3988 | |
3989 The do_marking_step() method tries to abort when the time target | |
3990 has been reached. There are a few other cases when the | |
3991 do_marking_step() method also aborts: | |
3992 | |
3993 (1) When the marking phase has been aborted (after a Full GC). | |
3994 | |
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3995 (2) When a global overflow (on the global stack) has been |
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3996 triggered. Before the task aborts, it will actually sync up with |
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3997 the other tasks to ensure that all the marking data structures |
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3998 (local queues, stacks, fingers etc.) are re-initialized so that |
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3999 when do_marking_step() completes, the marking phase can |
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4000 immediately restart. |
342 | 4001 |
4002 (3) When enough completed SATB buffers are available. The | |
4003 do_marking_step() method only tries to drain SATB buffers right | |
4004 at the beginning. So, if enough buffers are available, the | |
4005 marking step aborts and the SATB buffers are processed at | |
4006 the beginning of the next invocation. | |
4007 | |
4008 (4) To yield. when we have to yield then we abort and yield | |
4009 right at the end of do_marking_step(). This saves us from a lot | |
4010 of hassle as, by yielding we might allow a Full GC. If this | |
4011 happens then objects will be compacted underneath our feet, the | |
4012 heap might shrink, etc. We save checking for this by just | |
4013 aborting and doing the yield right at the end. | |
4014 | |
4015 From the above it follows that the do_marking_step() method should | |
4016 be called in a loop (or, otherwise, regularly) until it completes. | |
4017 | |
4018 If a marking step completes without its has_aborted() flag being | |
4019 true, it means it has completed the current marking phase (and | |
4020 also all other marking tasks have done so and have all synced up). | |
4021 | |
4022 A method called regular_clock_call() is invoked "regularly" (in | |
4023 sub ms intervals) throughout marking. It is this clock method that | |
4024 checks all the abort conditions which were mentioned above and | |
4025 decides when the task should abort. A work-based scheme is used to | |
4026 trigger this clock method: when the number of object words the | |
4027 marking phase has scanned or the number of references the marking | |
4028 phase has visited reach a given limit. Additional invocations to | |
4029 the method clock have been planted in a few other strategic places | |
4030 too. The initial reason for the clock method was to avoid calling | |
4031 vtime too regularly, as it is quite expensive. So, once it was in | |
4032 place, it was natural to piggy-back all the other conditions on it | |
4033 too and not constantly check them throughout the code. | |
4034 | |
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4035 If do_termination is true then do_marking_step will enter its |
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4036 termination protocol. |
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4037 |
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4038 The value of is_serial must be true when do_marking_step is being |
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4039 called serially (i.e. by the VMThread) and do_marking_step should |
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4040 skip any synchronization in the termination and overflow code. |
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4041 Examples include the serial remark code and the serial reference |
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4042 processing closures. |
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4043 |
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4044 The value of is_serial must be false when do_marking_step is |
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4045 being called by any of the worker threads in a work gang. |
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4046 Examples include the concurrent marking code (CMMarkingTask), |
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4047 the MT remark code, and the MT reference processing closures. |
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4048 |
342 | 4049 *****************************************************************************/ |
4050 | |
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4051 void CMTask::do_marking_step(double time_target_ms, |
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4052 bool do_termination, |
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4053 bool is_serial) { |
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4054 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4055 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4056 |
342 | 4057 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
1023
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4058 assert(_task_queues != NULL, "invariant"); |
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4059 assert(_task_queue != NULL, "invariant"); |
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4060 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4061 |
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4062 assert(!_claimed, |
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4063 "only one thread should claim this task at any one time"); |
342 | 4064 |
4065 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4066 // possible for two threads to set the _claimed flag at the same | |
4067 // time. But it is only for debugging purposes anyway and it will | |
4068 // catch most problems. | |
4069 _claimed = true; | |
4070 | |
4071 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4072 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4073 | |
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4074 // If do_stealing is true then do_marking_step will attempt to |
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4075 // steal work from the other CMTasks. It only makes sense to |
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4076 // enable stealing when the termination protocol is enabled |
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4077 // and do_marking_step() is not being called serially. |
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4078 bool do_stealing = do_termination && !is_serial; |
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4079 |
342 | 4080 double diff_prediction_ms = |
4081 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4082 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4083 | |
4084 // set up the variables that are used in the work-based scheme to | |
4085 // call the regular clock method | |
4086 _words_scanned = 0; | |
4087 _refs_reached = 0; | |
4088 recalculate_limits(); | |
4089 | |
4090 // clear all flags | |
4091 clear_has_aborted(); | |
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4092 _has_timed_out = false; |
342 | 4093 _draining_satb_buffers = false; |
4094 | |
4095 ++_calls; | |
4096 | |
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4097 if (_cm->verbose_low()) { |
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4098 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4099 "target = %1.2lfms >>>>>>>>>>", |
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4100 _worker_id, _calls, _time_target_ms); |
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4101 } |
342 | 4102 |
4103 // Set up the bitmap and oop closures. Anything that uses them is | |
4104 // eventually called from this method, so it is OK to allocate these | |
4105 // statically. | |
4106 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4107 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4108 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4109 |
4110 if (_cm->has_overflown()) { | |
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4111 // This can happen if the mark stack overflows during a GC pause |
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4112 // and this task, after a yield point, restarts. We have to abort |
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4113 // as we need to get into the overflow protocol which happens |
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4114 // right at the end of this task. |
342 | 4115 set_has_aborted(); |
4116 } | |
4117 | |
4118 // First drain any available SATB buffers. After this, we will not | |
4119 // look at SATB buffers before the next invocation of this method. | |
4120 // If enough completed SATB buffers are queued up, the regular clock | |
4121 // will abort this task so that it restarts. | |
4122 drain_satb_buffers(); | |
4123 // ...then partially drain the local queue and the global stack | |
4124 drain_local_queue(true); | |
4125 drain_global_stack(true); | |
4126 | |
4127 do { | |
4128 if (!has_aborted() && _curr_region != NULL) { | |
4129 // This means that we're already holding on to a region. | |
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4130 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4131 "should not be NULL either"); |
342 | 4132 |
4133 // We might have restarted this task after an evacuation pause | |
4134 // which might have evacuated the region we're holding on to | |
4135 // underneath our feet. Let's read its limit again to make sure | |
4136 // that we do not iterate over a region of the heap that | |
4137 // contains garbage (update_region_limit() will also move | |
4138 // _finger to the start of the region if it is found empty). | |
4139 update_region_limit(); | |
4140 // We will start from _finger not from the start of the region, | |
4141 // as we might be restarting this task after aborting half-way | |
4142 // through scanning this region. In this case, _finger points to | |
4143 // the address where we last found a marked object. If this is a | |
4144 // fresh region, _finger points to start(). | |
4145 MemRegion mr = MemRegion(_finger, _region_limit); | |
4146 | |
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4147 if (_cm->verbose_low()) { |
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|
4148 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4149 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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|
4150 "of region "HR_FORMAT, |
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4151 _worker_id, _finger, _region_limit, |
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4152 HR_FORMAT_PARAMS(_curr_region)); |
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4153 } |
342 | 4154 |
8039
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4155 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
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|
4156 "humongous regions should go around loop once only"); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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4157 |
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4158 // Some special cases: |
5e401ef52ec0
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4159 // 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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4160 // If the current region is humongous then we only need to check |
5e401ef52ec0
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4161 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
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|
4162 // scan the object if it's live, and give up the region. |
5e401ef52ec0
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4163 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
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|
4164 // that is left. |
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7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
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4165 // If the iteration is successful, give up the region. |
8039
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4166 if (mr.is_empty()) { |
5e401ef52ec0
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|
4167 giveup_current_region(); |
5e401ef52ec0
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|
4168 regular_clock_call(); |
5e401ef52ec0
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|
4169 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
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|
4170 if (_nextMarkBitMap->isMarked(mr.start())) { |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4171 // The object is marked - apply the closure |
5e401ef52ec0
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4172 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
5e401ef52ec0
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|
4173 bitmap_closure.do_bit(offset); |
5e401ef52ec0
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|
4174 } |
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4175 // Even if this task aborted while scanning the humongous object |
5e401ef52ec0
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4176 // we can (and should) give up the current region. |
5e401ef52ec0
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|
4177 giveup_current_region(); |
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|
4178 regular_clock_call(); |
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4179 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4180 giveup_current_region(); |
4181 regular_clock_call(); | |
4182 } else { | |
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4183 assert(has_aborted(), "currently the only way to do so"); |
342 | 4184 // The only way to abort the bitmap iteration is to return |
4185 // false from the do_bit() method. However, inside the | |
4186 // do_bit() method we move the _finger to point to the | |
4187 // object currently being looked at. So, if we bail out, we | |
4188 // have definitely set _finger to something non-null. | |
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4189 assert(_finger != NULL, "invariant"); |
342 | 4190 |
4191 // Region iteration was actually aborted. So now _finger | |
4192 // points to the address of the object we last scanned. If we | |
4193 // leave it there, when we restart this task, we will rescan | |
4194 // the object. It is easy to avoid this. We move the finger by | |
4195 // enough to point to the next possible object header (the | |
4196 // bitmap knows by how much we need to move it as it knows its | |
4197 // granularity). | |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4198 assert(_finger < _region_limit, "invariant"); |
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
tamao
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|
4199 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4200 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
4201 if (new_finger >= _region_limit) { |
5988
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4202 giveup_current_region(); |
1314
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|
4203 } else { |
5988
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|
4204 move_finger_to(new_finger); |
1314
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|
4205 } |
342 | 4206 } |
4207 } | |
4208 // At this point we have either completed iterating over the | |
4209 // region we were holding on to, or we have aborted. | |
4210 | |
4211 // We then partially drain the local queue and the global stack. | |
4212 // (Do we really need this?) | |
4213 drain_local_queue(true); | |
4214 drain_global_stack(true); | |
4215 | |
4216 // Read the note on the claim_region() method on why it might | |
4217 // return NULL with potentially more regions available for | |
4218 // claiming and why we have to check out_of_regions() to determine | |
4219 // whether we're done or not. | |
4220 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4221 // We are going to try to claim a new region. We should have | |
4222 // given up on the previous one. | |
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4223 // Separated the asserts so that we know which one fires. |
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|
4224 assert(_curr_region == NULL, "invariant"); |
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|
4225 assert(_finger == NULL, "invariant"); |
11d4857fe5e1
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|
4226 assert(_region_limit == NULL, "invariant"); |
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|
4227 if (_cm->verbose_low()) { |
6862
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|
4228 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
3776
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|
4229 } |
6862
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|
4230 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4231 if (claimed_region != NULL) { |
4232 // Yes, we managed to claim one | |
4233 statsOnly( ++_regions_claimed ); | |
4234 | |
3776
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|
4235 if (_cm->verbose_low()) { |
6862
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|
4236 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4237 "region "PTR_FORMAT, |
6862
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|
4238 _worker_id, claimed_region); |
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|
4239 } |
342 | 4240 |
4241 setup_for_region(claimed_region); | |
1023
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|
4242 assert(_curr_region == claimed_region, "invariant"); |
342 | 4243 } |
4244 // It is important to call the regular clock here. It might take | |
4245 // a while to claim a region if, for example, we hit a large | |
4246 // block of empty regions. So we need to call the regular clock | |
4247 // method once round the loop to make sure it's called | |
4248 // frequently enough. | |
4249 regular_clock_call(); | |
4250 } | |
4251 | |
4252 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
4253 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4254 "at this point we should be out of regions"); |
342 | 4255 } |
4256 } while ( _curr_region != NULL && !has_aborted()); | |
4257 | |
4258 if (!has_aborted()) { | |
4259 // We cannot check whether the global stack is empty, since other | |
5988
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|
4260 // tasks might be pushing objects to it concurrently. |
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|
4261 assert(_cm->out_of_regions(), |
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|
4262 "at this point we should be out of regions"); |
342 | 4263 |
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|
4264 if (_cm->verbose_low()) { |
6862
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|
4265 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
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|
4266 } |
342 | 4267 |
4268 // Try to reduce the number of available SATB buffers so that | |
4269 // remark has less work to do. | |
4270 drain_satb_buffers(); | |
4271 } | |
4272 | |
4273 // Since we've done everything else, we can now totally drain the | |
4274 // local queue and global stack. | |
4275 drain_local_queue(false); | |
4276 drain_global_stack(false); | |
4277 | |
4278 // Attempt at work stealing from other task's queues. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4279 if (do_stealing && !has_aborted()) { |
342 | 4280 // We have not aborted. This means that we have finished all that |
4281 // we could. Let's try to do some stealing... | |
4282 | |
4283 // We cannot check whether the global stack is empty, since other | |
5988
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|
4284 // tasks might be pushing objects to it concurrently. |
1023
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|
4285 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
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|
4286 "only way to reach here"); |
342 | 4287 |
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|
4288 if (_cm->verbose_low()) { |
6862
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|
4289 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
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|
4290 } |
342 | 4291 |
4292 while (!has_aborted()) { | |
4293 oop obj; | |
4294 statsOnly( ++_steal_attempts ); | |
4295 | |
6862
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|
4296 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
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|
4297 if (_cm->verbose_medium()) { |
6862
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|
4298 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
8a5ea0a9ccc4
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|
4299 _worker_id, (void*) obj); |
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|
4300 } |
342 | 4301 |
4302 statsOnly( ++_steals ); | |
4303 | |
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|
4304 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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|
4305 "any stolen object should be marked"); |
342 | 4306 scan_object(obj); |
4307 | |
4308 // And since we're towards the end, let's totally drain the | |
4309 // local queue and global stack. | |
4310 drain_local_queue(false); | |
4311 drain_global_stack(false); | |
4312 } else { | |
4313 break; | |
4314 } | |
4315 } | |
4316 } | |
4317 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
4318 // 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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|
4319 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
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|
4320 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
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changeset
|
4321 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
|
4322 _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
|
4323 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
|
4324 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4325 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4326 |
342 | 4327 // We still haven't aborted. Now, let's try to get into the |
4328 // termination protocol. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4329 if (do_termination && !has_aborted()) { |
342 | 4330 // We cannot check whether the global stack is empty, since other |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
4331 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
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|
4332 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
changeset
|
4333 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
4334 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4335 |
3776
23d434c6290d
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|
4336 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
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|
4337 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
4338 } |
342 | 4339 |
4340 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
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|
4341 |
342 | 4342 // The CMTask class also extends the TerminatorTerminator class, |
4343 // hence its should_exit_termination() method will also decide | |
4344 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4345 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4346 _cm->terminator()->offer_termination(this)); |
342 | 4347 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4348 _termination_time_ms += | |
4349 termination_end_time_ms - _termination_start_time_ms; | |
4350 | |
4351 if (finished) { | |
4352 // We're all done. | |
4353 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4354 if (_worker_id == 0) { |
342 | 4355 // let's allow task 0 to do this |
4356 if (concurrent()) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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changeset
|
4357 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4358 // we need to set this to false before the next |
4359 // safepoint. This way we ensure that the marking phase | |
4360 // doesn't observe any more heap expansions. | |
4361 _cm->clear_concurrent_marking_in_progress(); | |
4362 } | |
4363 } | |
4364 | |
4365 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4366 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
changeset
|
4367 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
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diff
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|
4368 // which one. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
changeset
|
4369 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4370 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4371 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4372 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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|
4373 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4374 |
3776
23d434c6290d
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|
4375 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4376 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
23d434c6290d
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|
4377 } |
342 | 4378 } else { |
4379 // Apparently there's more work to do. Let's abort this task. It | |
4380 // will restart it and we can hopefully find more things to do. | |
4381 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
4382 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
changeset
|
4383 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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diff
changeset
|
4384 _worker_id); |
3776
23d434c6290d
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diff
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|
4385 } |
342 | 4386 |
4387 set_has_aborted(); | |
4388 statsOnly( ++_aborted_termination ); | |
4389 } | |
4390 } | |
4391 | |
4392 // Mainly for debugging purposes to make sure that a pointer to the | |
4393 // closure which was statically allocated in this frame doesn't | |
4394 // escape it by accident. | |
3771 | 4395 set_cm_oop_closure(NULL); |
342 | 4396 double end_time_ms = os::elapsedVTime() * 1000.0; |
4397 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4398 // Update the step history. | |
4399 _step_times_ms.add(elapsed_time_ms); | |
4400 | |
4401 if (has_aborted()) { | |
4402 // The task was aborted for some reason. | |
4403 | |
4404 statsOnly( ++_aborted ); | |
4405 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
4406 if (_has_timed_out) { |
342 | 4407 double diff_ms = elapsed_time_ms - _time_target_ms; |
4408 // Keep statistics of how well we did with respect to hitting | |
4409 // our target only if we actually timed out (if we aborted for | |
4410 // other reasons, then the results might get skewed). | |
4411 _marking_step_diffs_ms.add(diff_ms); | |
4412 } | |
4413 | |
4414 if (_cm->has_overflown()) { | |
4415 // This is the interesting one. We aborted because a global | |
4416 // overflow was raised. This means we have to restart the | |
4417 // marking phase and start iterating over regions. However, in | |
4418 // order to do this we have to make sure that all tasks stop | |
4419 // what they are doing and re-initialise in a safe manner. We | |
4420 // will achieve this with the use of two barrier sync points. | |
4421 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
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|
4422 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
6812
diff
changeset
|
4423 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4424 } |
342 | 4425 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4426 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4427 // We only need to enter the sync barrier if being called |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4428 // from a parallel context |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4429 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4430 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4431 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4432 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4433 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4434 // task 0 will clear the global data structures. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4435 } |
342 | 4436 |
4437 statsOnly( ++_aborted_overflow ); | |
4438 | |
4439 // We clear the local state of this task... | |
4440 clear_region_fields(); | |
4441 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4442 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4443 // ...and enter the second barrier. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4444 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4445 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4446 // 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
|
4447 // marking, everything has been re-initialized and we're |
342 | 4448 // ready to restart. |
4449 } | |
4450 | |
4451 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4452 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4453 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4454 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4455 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4456 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
|
4457 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4458 } |
342 | 4459 } |
4460 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4461 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4462 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4463 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4464 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4465 } |
342 | 4466 } |
4467 | |
4468 _claimed = false; | |
4469 } | |
4470 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4471 CMTask::CMTask(uint worker_id, |
342 | 4472 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4473 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4474 BitMap* card_bm, |
342 | 4475 CMTaskQueue* task_queue, |
4476 CMTaskQueueSet* task_queues) | |
4477 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4478 _worker_id(worker_id), _cm(cm), |
342 | 4479 _claimed(false), |
4480 _nextMarkBitMap(NULL), _hash_seed(17), | |
4481 _task_queue(task_queue), | |
4482 _task_queues(task_queues), | |
3771 | 4483 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4484 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4485 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4486 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
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parents:
1022
diff
changeset
|
4487 guarantee(task_queues != NULL, "invariant"); |
342 | 4488 |
4489 statsOnly( _clock_due_to_scanning = 0; | |
4490 _clock_due_to_marking = 0 ); | |
4491 | |
4492 _marking_step_diffs_ms.add(0.5); | |
4493 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4494 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4495 // 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
|
4496 // 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
|
4497 // 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
|
4498 // 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
|
4499 // 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
|
4500 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4501 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4502 // 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
|
4503 // 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
|
4504 #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
|
4505 |
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
|
4506 #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
|
4507 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
4508 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
371bbc844bf1
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tonyp
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|
4509 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4510 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4511 #endif // _LP64 |
371bbc844bf1
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diff
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|
4512 |
371bbc844bf1
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|
4513 // For per-region info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4514 #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
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|
4515 #define G1PPRL_TYPE_H_FORMAT " %4s" |
371bbc844bf1
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tonyp
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diff
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|
4516 #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
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diff
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|
4517 #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:
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diff
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|
4518 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
4519 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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4520 |
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|
4521 // For summary info |
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|
4522 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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4523 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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4524 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4525 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4526 |
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|
4527 G1PrintRegionLivenessInfoClosure:: |
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4528 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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|
4529 : _out(out), |
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|
4530 _total_used_bytes(0), _total_capacity_bytes(0), |
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|
4531 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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4532 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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4533 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
12080 | 4534 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
2435
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|
4535 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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4536 MemRegion g1_committed = g1h->g1_committed(); |
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|
4537 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4538 double now = os::elapsedTime(); |
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|
4539 |
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4540 // Print the header of the output. |
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|
4541 _out->cr(); |
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|
4542 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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4543 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4544 G1PPRL_SUM_ADDR_FORMAT("committed") |
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4545 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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4546 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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|
4547 g1_committed.start(), g1_committed.end(), |
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|
4548 g1_reserved.start(), g1_reserved.end(), |
3986
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7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
4549 HeapRegion::GrainBytes); |
2435
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|
4550 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4551 _out->print_cr(G1PPRL_LINE_PREFIX |
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4552 G1PPRL_TYPE_H_FORMAT |
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|
4553 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4554 G1PPRL_BYTE_H_FORMAT |
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|
4555 G1PPRL_BYTE_H_FORMAT |
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|
4556 G1PPRL_BYTE_H_FORMAT |
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|
4557 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4558 G1PPRL_BYTE_H_FORMAT |
10290
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|
4559 G1PPRL_BYTE_H_FORMAT, |
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|
4560 "type", "address-range", |
12080 | 4561 "used", "prev-live", "next-live", "gc-eff", |
4562 "remset", "code-roots"); | |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
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|
4563 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
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|
4564 G1PPRL_TYPE_H_FORMAT |
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|
4565 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4566 G1PPRL_BYTE_H_FORMAT |
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|
4567 G1PPRL_BYTE_H_FORMAT |
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|
4568 G1PPRL_BYTE_H_FORMAT |
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|
4569 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4570 G1PPRL_BYTE_H_FORMAT |
10290
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|
4571 G1PPRL_BYTE_H_FORMAT, |
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|
4572 "", "", |
12080 | 4573 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
4574 "(bytes)", "(bytes)"); | |
2435
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|
4575 } |
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|
4576 |
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|
4577 // It takes as a parameter a reference to one of the _hum_* fields, it |
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|
4578 // deduces the corresponding value for a region in a humongous region |
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|
4579 // series (either the region size, or what's left if the _hum_* field |
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4580 // is < the region size), and updates the _hum_* field accordingly. |
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|
4581 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4582 size_t bytes = 0; |
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|
4583 // The > 0 check is to deal with the prev and next live bytes which |
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|
4584 // could be 0. |
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|
4585 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3979
diff
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|
4586 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
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|
4587 *hum_bytes -= bytes; |
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|
4588 } |
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|
4589 return bytes; |
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|
4590 } |
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|
4591 |
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|
4592 // It deduces the values for a region in a humongous region series |
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|
4593 // from the _hum_* fields and updates those accordingly. It assumes |
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|
4594 // that that _hum_* fields have already been set up from the "starts |
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|
4595 // humongous" region and we visit the regions in address order. |
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|
4596 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4597 size_t* capacity_bytes, |
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|
4598 size_t* prev_live_bytes, |
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|
4599 size_t* next_live_bytes) { |
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|
4600 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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|
4601 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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|
4602 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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|
4603 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4604 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4605 } |
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|
4606 |
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|
4607 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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|
4608 const char* type = ""; |
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|
4609 HeapWord* bottom = r->bottom(); |
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|
4610 HeapWord* end = r->end(); |
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|
4611 size_t capacity_bytes = r->capacity(); |
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|
4612 size_t used_bytes = r->used(); |
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|
4613 size_t prev_live_bytes = r->live_bytes(); |
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|
4614 size_t next_live_bytes = r->next_live_bytes(); |
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|
4615 double gc_eff = r->gc_efficiency(); |
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|
4616 size_t remset_bytes = r->rem_set()->mem_size(); |
12080 | 4617 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
4618 | |
2435
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|
4619 if (r->used() == 0) { |
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|
4620 type = "FREE"; |
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|
4621 } else if (r->is_survivor()) { |
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|
4622 type = "SURV"; |
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diff
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|
4623 } else if (r->is_young()) { |
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|
4624 type = "EDEN"; |
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|
4625 } else if (r->startsHumongous()) { |
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|
4626 type = "HUMS"; |
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|
4627 |
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|
4628 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4629 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
4630 "they should have been zeroed after the last time we used them"); |
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|
4631 // Set up the _hum_* fields. |
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|
4632 _hum_capacity_bytes = capacity_bytes; |
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|
4633 _hum_used_bytes = used_bytes; |
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|
4634 _hum_prev_live_bytes = prev_live_bytes; |
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|
4635 _hum_next_live_bytes = next_live_bytes; |
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|
4636 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4637 &prev_live_bytes, &next_live_bytes); |
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4638 end = bottom + HeapRegion::GrainWords; |
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4639 } else if (r->continuesHumongous()) { |
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4640 type = "HUMC"; |
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4641 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4642 &prev_live_bytes, &next_live_bytes); |
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4643 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4644 } else { |
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4645 type = "OLD"; |
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4646 } |
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4647 |
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4648 _total_used_bytes += used_bytes; |
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4649 _total_capacity_bytes += capacity_bytes; |
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4650 _total_prev_live_bytes += prev_live_bytes; |
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4651 _total_next_live_bytes += next_live_bytes; |
10290
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4652 _total_remset_bytes += remset_bytes; |
12080 | 4653 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
2435
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4654 |
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4655 // Print a line for this particular region. |
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4656 _out->print_cr(G1PPRL_LINE_PREFIX |
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4657 G1PPRL_TYPE_FORMAT |
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4658 G1PPRL_ADDR_BASE_FORMAT |
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4659 G1PPRL_BYTE_FORMAT |
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4660 G1PPRL_BYTE_FORMAT |
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|
4661 G1PPRL_BYTE_FORMAT |
10290
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4662 G1PPRL_DOUBLE_FORMAT |
12080 | 4663 G1PPRL_BYTE_FORMAT |
10290
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4664 G1PPRL_BYTE_FORMAT, |
2435
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4665 type, bottom, end, |
12080 | 4666 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
4667 remset_bytes, strong_code_roots_bytes); | |
2435
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|
4668 |
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|
4669 return false; |
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|
4670 } |
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|
4671 |
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4672 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
10290
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4673 // add static memory usages to remembered set sizes |
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4674 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
2435
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4675 // Print the footer of the output. |
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4676 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4677 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4678 " SUMMARY" |
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|
4679 G1PPRL_SUM_MB_FORMAT("capacity") |
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4680 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4681 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
10290
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4682 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
12080 | 4683 G1PPRL_SUM_MB_FORMAT("remset") |
4684 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
2435
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4685 bytes_to_mb(_total_capacity_bytes), |
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|
4686 bytes_to_mb(_total_used_bytes), |
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|
4687 perc(_total_used_bytes, _total_capacity_bytes), |
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|
4688 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
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|
4689 perc(_total_prev_live_bytes, _total_capacity_bytes), |
371bbc844bf1
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|
4690 bytes_to_mb(_total_next_live_bytes), |
10290
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8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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|
4691 perc(_total_next_live_bytes, _total_capacity_bytes), |
12080 | 4692 bytes_to_mb(_total_remset_bytes), |
4693 bytes_to_mb(_total_strong_code_roots_bytes)); | |
2435
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|
4694 _out->cr(); |
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|
4695 } |