Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 7449:37f7535e5f18
8001424: G1: Rename certain G1-specific flags
Summary: Rename G1DefaultMinNewGenPercent, G1DefaultMaxNewGenPercent, and G1OldCSetRegionLiveThresholdPercent to G1NewSizePercent, G1MaxNewSizePercent, and G1MixedGCLiveThresholdPercent respectively. The previous names are no longer accepted.
Reviewed-by: brutisso, ysr
author | johnc |
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date | Fri, 21 Dec 2012 11:45:34 -0800 |
parents | 442f942757c0 |
children | d275c3dc73e6 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 39 #include "memory/genOopClosures.inline.hpp" |
40 #include "memory/referencePolicy.hpp" | |
41 #include "memory/resourceArea.hpp" | |
42 #include "oops/oop.inline.hpp" | |
43 #include "runtime/handles.inline.hpp" | |
44 #include "runtime/java.hpp" | |
6197 | 45 #include "services/memTracker.hpp" |
342 | 46 |
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47 // Concurrent marking bit map wrapper |
342 | 48 |
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49 CMBitMapRO::CMBitMapRO(int shifter) : |
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50 _bm(), |
342 | 51 _shifter(shifter) { |
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52 _bmStartWord = 0; |
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53 _bmWordSize = 0; |
342 | 54 } |
55 | |
56 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
57 HeapWord* limit) const { | |
58 // First we must round addr *up* to a possible object boundary. | |
59 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
60 HeapWordSize << _shifter); | |
61 size_t addrOffset = heapWordToOffset(addr); | |
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62 if (limit == NULL) { |
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63 limit = _bmStartWord + _bmWordSize; |
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64 } |
342 | 65 size_t limitOffset = heapWordToOffset(limit); |
66 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
67 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
68 assert(nextAddr >= addr, "get_next_one postcondition"); | |
69 assert(nextAddr == limit || isMarked(nextAddr), | |
70 "get_next_one postcondition"); | |
71 return nextAddr; | |
72 } | |
73 | |
74 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
75 HeapWord* limit) const { | |
76 size_t addrOffset = heapWordToOffset(addr); | |
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77 if (limit == NULL) { |
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78 limit = _bmStartWord + _bmWordSize; |
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79 } |
342 | 80 size_t limitOffset = heapWordToOffset(limit); |
81 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
82 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
83 assert(nextAddr >= addr, "get_next_one postcondition"); | |
84 assert(nextAddr == limit || !isMarked(nextAddr), | |
85 "get_next_one postcondition"); | |
86 return nextAddr; | |
87 } | |
88 | |
89 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
90 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
91 return (int) (diff >> _shifter); | |
92 } | |
93 | |
94 #ifndef PRODUCT | |
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95 bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
342 | 96 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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97 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 98 "size inconsistency"); |
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99 return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
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100 _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
342 | 101 } |
102 #endif | |
103 | |
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104 bool CMBitMap::allocate(ReservedSpace heap_rs) { |
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105 _bmStartWord = (HeapWord*)(heap_rs.base()); |
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106 _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
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107 ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
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108 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
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109 if (!brs.is_reserved()) { |
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110 warning("ConcurrentMark marking bit map allocation failure"); |
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111 return false; |
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112 } |
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113 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
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114 // For now we'll just commit all of the bit map up front. |
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115 // Later on we'll try to be more parsimonious with swap. |
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116 if (!_virtual_space.initialize(brs, brs.size())) { |
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117 warning("ConcurrentMark marking bit map backing store failure"); |
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118 return false; |
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119 } |
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120 assert(_virtual_space.committed_size() == brs.size(), |
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121 "didn't reserve backing store for all of concurrent marking bit map?"); |
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122 _bm.set_map((uintptr_t*)_virtual_space.low()); |
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123 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
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124 _bmWordSize, "inconsistency in bit map sizing"); |
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125 _bm.set_size(_bmWordSize >> _shifter); |
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126 return true; |
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127 } |
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128 |
342 | 129 void CMBitMap::clearAll() { |
130 _bm.clear(); | |
131 return; | |
132 } | |
133 | |
134 void CMBitMap::markRange(MemRegion mr) { | |
135 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
136 assert(!mr.is_empty(), "unexpected empty region"); | |
137 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
138 ((HeapWord *) mr.end())), | |
139 "markRange memory region end is not card aligned"); | |
140 // convert address range into offset range | |
141 _bm.at_put_range(heapWordToOffset(mr.start()), | |
142 heapWordToOffset(mr.end()), true); | |
143 } | |
144 | |
145 void CMBitMap::clearRange(MemRegion mr) { | |
146 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
147 assert(!mr.is_empty(), "unexpected empty region"); | |
148 // convert address range into offset range | |
149 _bm.at_put_range(heapWordToOffset(mr.start()), | |
150 heapWordToOffset(mr.end()), false); | |
151 } | |
152 | |
153 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
154 HeapWord* end_addr) { | |
155 HeapWord* start = getNextMarkedWordAddress(addr); | |
156 start = MIN2(start, end_addr); | |
157 HeapWord* end = getNextUnmarkedWordAddress(start); | |
158 end = MIN2(end, end_addr); | |
159 assert(start <= end, "Consistency check"); | |
160 MemRegion mr(start, end); | |
161 if (!mr.is_empty()) { | |
162 clearRange(mr); | |
163 } | |
164 return mr; | |
165 } | |
166 | |
167 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
168 _base(NULL), _cm(cm) | |
169 #ifdef ASSERT | |
170 , _drain_in_progress(false) | |
171 , _drain_in_progress_yields(false) | |
172 #endif | |
173 {} | |
174 | |
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175 bool CMMarkStack::allocate(size_t capacity) { |
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176 // allocate a stack of the requisite depth |
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177 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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178 if (!rs.is_reserved()) { |
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179 warning("ConcurrentMark MarkStack allocation failure"); |
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180 return false; |
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181 } |
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182 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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183 if (!_virtual_space.initialize(rs, rs.size())) { |
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184 warning("ConcurrentMark MarkStack backing store failure"); |
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185 // Release the virtual memory reserved for the marking stack |
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186 rs.release(); |
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187 return false; |
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188 } |
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189 assert(_virtual_space.committed_size() == rs.size(), |
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190 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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191 _base = (oop*) _virtual_space.low(); |
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192 setEmpty(); |
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193 _capacity = (jint) capacity; |
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194 _saved_index = -1; |
342 | 195 NOT_PRODUCT(_max_depth = 0); |
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196 return true; |
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197 } |
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198 |
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199 void CMMarkStack::expand() { |
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200 // Called, during remark, if we've overflown the marking stack during marking. |
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201 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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202 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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203 // Clear expansion flag |
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204 _should_expand = false; |
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205 if (_capacity == (jint) MarkStackSizeMax) { |
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206 if (PrintGCDetails && Verbose) { |
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207 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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208 } |
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209 return; |
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210 } |
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211 // Double capacity if possible |
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212 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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213 // Do not give up existing stack until we have managed to |
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214 // get the double capacity that we desired. |
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215 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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216 sizeof(oop))); |
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217 if (rs.is_reserved()) { |
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218 // Release the backing store associated with old stack |
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219 _virtual_space.release(); |
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220 // Reinitialize virtual space for new stack |
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221 if (!_virtual_space.initialize(rs, rs.size())) { |
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222 fatal("Not enough swap for expanded marking stack capacity"); |
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223 } |
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224 _base = (oop*)(_virtual_space.low()); |
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225 _index = 0; |
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226 _capacity = new_capacity; |
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227 } else { |
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228 if (PrintGCDetails && Verbose) { |
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229 // Failed to double capacity, continue; |
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230 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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231 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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232 _capacity / K, new_capacity / K); |
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233 } |
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234 } |
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235 } |
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236 |
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237 void CMMarkStack::set_should_expand() { |
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238 // If we're resetting the marking state because of an |
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239 // marking stack overflow, record that we should, if |
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240 // possible, expand the stack. |
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241 _should_expand = _cm->has_overflown(); |
342 | 242 } |
243 | |
244 CMMarkStack::~CMMarkStack() { | |
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245 if (_base != NULL) { |
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246 _base = NULL; |
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247 _virtual_space.release(); |
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248 } |
342 | 249 } |
250 | |
251 void CMMarkStack::par_push(oop ptr) { | |
252 while (true) { | |
253 if (isFull()) { | |
254 _overflow = true; | |
255 return; | |
256 } | |
257 // Otherwise... | |
258 jint index = _index; | |
259 jint next_index = index+1; | |
260 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
261 if (res == index) { | |
262 _base[index] = ptr; | |
263 // Note that we don't maintain this atomically. We could, but it | |
264 // doesn't seem necessary. | |
265 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
266 return; | |
267 } | |
268 // Otherwise, we need to try again. | |
269 } | |
270 } | |
271 | |
272 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
273 while (true) { | |
274 if (isFull()) { | |
275 _overflow = true; | |
276 return; | |
277 } | |
278 // Otherwise... | |
279 jint index = _index; | |
280 jint next_index = index + n; | |
281 if (next_index > _capacity) { | |
282 _overflow = true; | |
283 return; | |
284 } | |
285 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
286 if (res == index) { | |
287 for (int i = 0; i < n; i++) { | |
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288 int ind = index + i; |
342 | 289 assert(ind < _capacity, "By overflow test above."); |
290 _base[ind] = ptr_arr[i]; | |
291 } | |
292 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
293 return; | |
294 } | |
295 // Otherwise, we need to try again. | |
296 } | |
297 } | |
298 | |
299 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
300 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
301 jint start = _index; | |
302 jint next_index = start + n; | |
303 if (next_index > _capacity) { | |
304 _overflow = true; | |
305 return; | |
306 } | |
307 // Otherwise. | |
308 _index = next_index; | |
309 for (int i = 0; i < n; i++) { | |
310 int ind = start + i; | |
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311 assert(ind < _capacity, "By overflow test above."); |
342 | 312 _base[ind] = ptr_arr[i]; |
313 } | |
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314 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 315 } |
316 | |
317 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
318 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
319 jint index = _index; | |
320 if (index == 0) { | |
321 *n = 0; | |
322 return false; | |
323 } else { | |
324 int k = MIN2(max, index); | |
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325 jint new_ind = index - k; |
342 | 326 for (int j = 0; j < k; j++) { |
327 ptr_arr[j] = _base[new_ind + j]; | |
328 } | |
329 _index = new_ind; | |
330 *n = k; | |
331 return true; | |
332 } | |
333 } | |
334 | |
335 template<class OopClosureClass> | |
336 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
337 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
338 || SafepointSynchronize::is_at_safepoint(), | |
339 "Drain recursion must be yield-safe."); | |
340 bool res = true; | |
341 debug_only(_drain_in_progress = true); | |
342 debug_only(_drain_in_progress_yields = yield_after); | |
343 while (!isEmpty()) { | |
344 oop newOop = pop(); | |
345 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
346 assert(newOop->is_oop(), "Expected an oop"); | |
347 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
348 "only grey objects on this stack"); | |
349 newOop->oop_iterate(cl); | |
350 if (yield_after && _cm->do_yield_check()) { | |
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351 res = false; |
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352 break; |
342 | 353 } |
354 } | |
355 debug_only(_drain_in_progress = false); | |
356 return res; | |
357 } | |
358 | |
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359 void CMMarkStack::note_start_of_gc() { |
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360 assert(_saved_index == -1, |
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361 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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362 _saved_index = _index; |
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363 } |
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364 |
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365 void CMMarkStack::note_end_of_gc() { |
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366 // This is intentionally a guarantee, instead of an assert. If we |
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367 // accidentally add something to the mark stack during GC, it |
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368 // will be a correctness issue so it's better if we crash. we'll |
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369 // only check this once per GC anyway, so it won't be a performance |
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370 // issue in any way. |
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371 guarantee(_saved_index == _index, |
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372 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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373 _saved_index = -1; |
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374 } |
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375 |
342 | 376 void CMMarkStack::oops_do(OopClosure* f) { |
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377 assert(_saved_index == _index, |
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378 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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379 for (int i = 0; i < _index; i += 1) { |
342 | 380 f->do_oop(&_base[i]); |
381 } | |
382 } | |
383 | |
384 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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385 return _g1h->is_obj_ill(obj); |
342 | 386 } |
387 | |
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388 CMRootRegions::CMRootRegions() : |
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389 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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390 _should_abort(false), _next_survivor(NULL) { } |
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391 |
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392 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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393 _young_list = g1h->young_list(); |
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394 _cm = cm; |
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395 } |
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396 |
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397 void CMRootRegions::prepare_for_scan() { |
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398 assert(!scan_in_progress(), "pre-condition"); |
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399 |
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400 // Currently, only survivors can be root regions. |
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401 assert(_next_survivor == NULL, "pre-condition"); |
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402 _next_survivor = _young_list->first_survivor_region(); |
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403 _scan_in_progress = (_next_survivor != NULL); |
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404 _should_abort = false; |
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405 } |
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406 |
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407 HeapRegion* CMRootRegions::claim_next() { |
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408 if (_should_abort) { |
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409 // If someone has set the should_abort flag, we return NULL to |
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410 // force the caller to bail out of their loop. |
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411 return NULL; |
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412 } |
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413 |
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414 // Currently, only survivors can be root regions. |
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415 HeapRegion* res = _next_survivor; |
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416 if (res != NULL) { |
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417 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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418 // Read it again in case it changed while we were waiting for the lock. |
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419 res = _next_survivor; |
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420 if (res != NULL) { |
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421 if (res == _young_list->last_survivor_region()) { |
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422 // We just claimed the last survivor so store NULL to indicate |
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423 // that we're done. |
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424 _next_survivor = NULL; |
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425 } else { |
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426 _next_survivor = res->get_next_young_region(); |
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427 } |
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428 } else { |
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429 // Someone else claimed the last survivor while we were trying |
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430 // to take the lock so nothing else to do. |
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431 } |
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432 } |
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433 assert(res == NULL || res->is_survivor(), "post-condition"); |
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434 |
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435 return res; |
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436 } |
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437 |
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438 void CMRootRegions::scan_finished() { |
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439 assert(scan_in_progress(), "pre-condition"); |
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440 |
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441 // Currently, only survivors can be root regions. |
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442 if (!_should_abort) { |
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443 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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444 } |
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445 _next_survivor = NULL; |
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446 |
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447 { |
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448 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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449 _scan_in_progress = false; |
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450 RootRegionScan_lock->notify_all(); |
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451 } |
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452 } |
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453 |
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454 bool CMRootRegions::wait_until_scan_finished() { |
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455 if (!scan_in_progress()) return false; |
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456 |
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457 { |
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458 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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459 while (scan_in_progress()) { |
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460 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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461 } |
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462 } |
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463 return true; |
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464 } |
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465 |
342 | 466 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
467 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
468 #endif // _MSC_VER | |
469 | |
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470 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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471 return MAX2((n_par_threads + 2) / 4, 1U); |
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472 } |
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473 |
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474 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
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475 _g1h(g1h), |
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476 _markBitMap1(MinObjAlignment - 1), |
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477 _markBitMap2(MinObjAlignment - 1), |
342 | 478 |
479 _parallel_marking_threads(0), | |
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480 _max_parallel_marking_threads(0), |
342 | 481 _sleep_factor(0.0), |
482 _marking_task_overhead(1.0), | |
483 _cleanup_sleep_factor(0.0), | |
484 _cleanup_task_overhead(1.0), | |
2152 | 485 _cleanup_list("Cleanup List"), |
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486 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
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487 _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
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488 CardTableModRefBS::card_shift, |
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489 false /* in_resource_area*/), |
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490 |
342 | 491 _prevMarkBitMap(&_markBitMap1), |
492 _nextMarkBitMap(&_markBitMap2), | |
493 | |
494 _markStack(this), | |
495 // _finger set in set_non_marking_state | |
496 | |
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497 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 498 // _active_tasks set in set_non_marking_state |
499 // _tasks set inside the constructor | |
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500 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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501 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 502 |
503 _has_overflown(false), | |
504 _concurrent(false), | |
619
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505 _has_aborted(false), |
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506 _restart_for_overflow(false), |
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507 _concurrent_marking_in_progress(false), |
342 | 508 |
509 // _verbose_level set below | |
510 | |
511 _init_times(), | |
512 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
513 _cleanup_times(), | |
514 _total_counting_time(0.0), | |
515 _total_rs_scrub_time(0.0), | |
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516 |
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517 _parallel_workers(NULL), |
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518 |
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519 _count_card_bitmaps(NULL), |
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520 _count_marked_bytes(NULL), |
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521 _completed_initialization(false) { |
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522 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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523 if (verbose_level < no_verbose) { |
342 | 524 verbose_level = no_verbose; |
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525 } |
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526 if (verbose_level > high_verbose) { |
342 | 527 verbose_level = high_verbose; |
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528 } |
342 | 529 _verbose_level = verbose_level; |
530 | |
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531 if (verbose_low()) { |
342 | 532 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
533 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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534 } |
342 | 535 |
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536 if (!_markBitMap1.allocate(heap_rs)) { |
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537 warning("Failed to allocate first CM bit map"); |
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538 return; |
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539 } |
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540 if (!_markBitMap2.allocate(heap_rs)) { |
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541 warning("Failed to allocate second CM bit map"); |
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542 return; |
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543 } |
342 | 544 |
545 // Create & start a ConcurrentMark thread. | |
845
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546 _cmThread = new ConcurrentMarkThread(this); |
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547 assert(cmThread() != NULL, "CM Thread should have been created"); |
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548 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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549 |
342 | 550 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
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551 assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
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552 assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
342 | 553 |
554 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 555 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 556 |
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557 _root_regions.init(_g1h, this); |
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558 |
1284 | 559 if (ConcGCThreads > ParallelGCThreads) { |
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560 warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") " |
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561 "than ParallelGCThreads (" UINT32_FORMAT ").", |
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562 ConcGCThreads, ParallelGCThreads); |
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563 return; |
342 | 564 } |
565 if (ParallelGCThreads == 0) { | |
566 // if we are not running with any parallel GC threads we will not | |
567 // spawn any marking threads either | |
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568 _parallel_marking_threads = 0; |
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569 _max_parallel_marking_threads = 0; |
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570 _sleep_factor = 0.0; |
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571 _marking_task_overhead = 1.0; |
342 | 572 } else { |
1284 | 573 if (ConcGCThreads > 0) { |
574 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 575 // if both are set |
576 | |
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577 _parallel_marking_threads = (uint) ConcGCThreads; |
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578 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 579 _sleep_factor = 0.0; |
580 _marking_task_overhead = 1.0; | |
751 | 581 } else if (G1MarkingOverheadPercent > 0) { |
342 | 582 // we will calculate the number of parallel marking threads |
583 // based on a target overhead with respect to the soft real-time | |
584 // goal | |
585 | |
751 | 586 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 587 double overall_cm_overhead = |
751 | 588 (double) MaxGCPauseMillis * marking_overhead / |
589 (double) GCPauseIntervalMillis; | |
342 | 590 double cpu_ratio = 1.0 / (double) os::processor_count(); |
591 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
592 double marking_task_overhead = | |
593 overall_cm_overhead / marking_thread_num * | |
594 (double) os::processor_count(); | |
595 double sleep_factor = | |
596 (1.0 - marking_task_overhead) / marking_task_overhead; | |
597 | |
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598 _parallel_marking_threads = (uint) marking_thread_num; |
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599 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 600 _sleep_factor = sleep_factor; |
601 _marking_task_overhead = marking_task_overhead; | |
602 } else { | |
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603 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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604 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 605 _sleep_factor = 0.0; |
606 _marking_task_overhead = 1.0; | |
607 } | |
608 | |
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609 if (parallel_marking_threads() > 1) { |
342 | 610 _cleanup_task_overhead = 1.0; |
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611 } else { |
342 | 612 _cleanup_task_overhead = marking_task_overhead(); |
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613 } |
342 | 614 _cleanup_sleep_factor = |
615 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
616 | |
617 #if 0 | |
618 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
619 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
620 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
621 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
622 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
623 #endif | |
624 | |
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625 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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626 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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627 _max_parallel_marking_threads, false, true); |
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628 if (_parallel_workers == NULL) { |
342 | 629 vm_exit_during_initialization("Failed necessary allocation."); |
1833
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630 } else { |
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631 _parallel_workers->initialize_workers(); |
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632 } |
342 | 633 } |
634 | |
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635 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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636 uintx mark_stack_size = |
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637 MIN2(MarkStackSizeMax, |
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638 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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639 // Verify that the calculated value for MarkStackSize is in range. |
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640 // It would be nice to use the private utility routine from Arguments. |
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641 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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642 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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643 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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644 mark_stack_size, 1, MarkStackSizeMax); |
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645 return; |
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646 } |
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647 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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648 } else { |
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649 // Verify MarkStackSize is in range. |
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650 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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651 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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652 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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653 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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654 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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655 MarkStackSize, 1, MarkStackSizeMax); |
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656 return; |
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657 } |
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658 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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659 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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660 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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661 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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662 MarkStackSize, MarkStackSizeMax); |
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663 return; |
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664 } |
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665 } |
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666 } |
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667 } |
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668 |
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669 if (!_markStack.allocate(MarkStackSize)) { |
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670 warning("Failed to allocate CM marking stack"); |
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671 return; |
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672 } |
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673 |
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674 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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675 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
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676 |
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677 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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678 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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679 |
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680 BitMap::idx_t card_bm_size = _card_bm.size(); |
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681 |
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682 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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683 _active_tasks = _max_worker_id; |
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684 |
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685 size_t max_regions = (size_t) _g1h->max_regions(); |
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686 for (uint i = 0; i < _max_worker_id; ++i) { |
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687 CMTaskQueue* task_queue = new CMTaskQueue(); |
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688 task_queue->initialize(); |
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689 _task_queues->register_queue(i, task_queue); |
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690 |
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691 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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692 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
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693 |
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694 _tasks[i] = new CMTask(i, this, |
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695 _count_marked_bytes[i], |
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696 &_count_card_bitmaps[i], |
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697 task_queue, _task_queues); |
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698 |
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699 _accum_task_vtime[i] = 0.0; |
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700 } |
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701 |
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702 // Calculate the card number for the bottom of the heap. Used |
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703 // in biasing indexes into the accounting card bitmaps. |
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704 _heap_bottom_card_num = |
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705 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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706 CardTableModRefBS::card_shift); |
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707 |
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708 // Clear all the liveness counting data |
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709 clear_all_count_data(); |
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710 |
342 | 711 // so that the call below can read a sensible value |
7397
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712 _heap_start = (HeapWord*) heap_rs.base(); |
342 | 713 set_non_marking_state(); |
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714 _completed_initialization = true; |
342 | 715 } |
716 | |
717 void ConcurrentMark::update_g1_committed(bool force) { | |
718 // If concurrent marking is not in progress, then we do not need to | |
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719 // update _heap_end. |
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720 if (!concurrent_marking_in_progress() && !force) return; |
342 | 721 |
722 MemRegion committed = _g1h->g1_committed(); | |
1023
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723 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 724 HeapWord* new_end = committed.end(); |
725 if (new_end > _heap_end) { | |
726 // The heap has been expanded. | |
727 | |
728 _heap_end = new_end; | |
729 } | |
730 // Notice that the heap can also shrink. However, this only happens | |
731 // during a Full GC (at least currently) and the entire marking | |
732 // phase will bail out and the task will not be restarted. So, let's | |
733 // do nothing. | |
734 } | |
735 | |
736 void ConcurrentMark::reset() { | |
737 // Starting values for these two. This should be called in a STW | |
738 // phase. CM will be notified of any future g1_committed expansions | |
739 // will be at the end of evacuation pauses, when tasks are | |
740 // inactive. | |
741 MemRegion committed = _g1h->g1_committed(); | |
742 _heap_start = committed.start(); | |
743 _heap_end = committed.end(); | |
744 | |
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745 // Separated the asserts so that we know which one fires. |
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746 assert(_heap_start != NULL, "heap bounds should look ok"); |
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747 assert(_heap_end != NULL, "heap bounds should look ok"); |
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748 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 749 |
750 // reset all the marking data structures and any necessary flags | |
751 clear_marking_state(); | |
752 | |
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753 if (verbose_low()) { |
342 | 754 gclog_or_tty->print_cr("[global] resetting"); |
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755 } |
342 | 756 |
757 // We do reset all of them, since different phases will use | |
758 // different number of active threads. So, it's easiest to have all | |
759 // of them ready. | |
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760 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 761 _tasks[i]->reset(_nextMarkBitMap); |
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762 } |
342 | 763 |
764 // we need this to make sure that the flag is on during the evac | |
765 // pause with initial mark piggy-backed | |
766 set_concurrent_marking_in_progress(); | |
767 } | |
768 | |
4728
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769 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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770 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 771 |
772 _active_tasks = active_tasks; | |
773 // Need to update the three data structures below according to the | |
774 // number of active threads for this phase. | |
775 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
776 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
777 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
778 | |
779 _concurrent = concurrent; | |
780 // We propagate this to all tasks, not just the active ones. | |
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781 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 782 _tasks[i]->set_concurrent(concurrent); |
783 | |
784 if (concurrent) { | |
785 set_concurrent_marking_in_progress(); | |
786 } else { | |
787 // We currently assume that the concurrent flag has been set to | |
788 // false before we start remark. At this point we should also be | |
789 // in a STW phase. | |
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790 assert(!concurrent_marking_in_progress(), "invariant"); |
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791 assert(_finger == _heap_end, "only way to get here"); |
342 | 792 update_g1_committed(true); |
793 } | |
794 } | |
795 | |
796 void ConcurrentMark::set_non_marking_state() { | |
797 // We set the global marking state to some default values when we're | |
798 // not doing marking. | |
799 clear_marking_state(); | |
800 _active_tasks = 0; | |
801 clear_concurrent_marking_in_progress(); | |
802 } | |
803 | |
804 ConcurrentMark::~ConcurrentMark() { | |
4735 | 805 // The ConcurrentMark instance is never freed. |
806 ShouldNotReachHere(); | |
342 | 807 } |
808 | |
809 void ConcurrentMark::clearNextBitmap() { | |
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810 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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811 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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812 |
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813 // Make sure that the concurrent mark thread looks to still be in |
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814 // the current cycle. |
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815 guarantee(cmThread()->during_cycle(), "invariant"); |
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816 |
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817 // We are finishing up the current cycle by clearing the next |
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818 // marking bitmap and getting it ready for the next cycle. During |
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819 // this time no other cycle can start. So, let's make sure that this |
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820 // is the case. |
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821 guarantee(!g1h->mark_in_progress(), "invariant"); |
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822 |
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823 // clear the mark bitmap (no grey objects to start with). |
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824 // We need to do this in chunks and offer to yield in between |
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825 // each chunk. |
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826 HeapWord* start = _nextMarkBitMap->startWord(); |
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827 HeapWord* end = _nextMarkBitMap->endWord(); |
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828 HeapWord* cur = start; |
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829 size_t chunkSize = M; |
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830 while (cur < end) { |
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831 HeapWord* next = cur + chunkSize; |
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832 if (next > end) { |
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833 next = end; |
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834 } |
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835 MemRegion mr(cur,next); |
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836 _nextMarkBitMap->clearRange(mr); |
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837 cur = next; |
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838 do_yield_check(); |
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839 |
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840 // Repeat the asserts from above. We'll do them as asserts here to |
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841 // minimize their overhead on the product. However, we'll have |
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842 // them as guarantees at the beginning / end of the bitmap |
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843 // clearing to get some checking in the product. |
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844 assert(cmThread()->during_cycle(), "invariant"); |
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845 assert(!g1h->mark_in_progress(), "invariant"); |
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846 } |
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847 |
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848 // Clear the liveness counting data |
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849 clear_all_count_data(); |
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850 |
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851 // Repeat the asserts from above. |
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852 guarantee(cmThread()->during_cycle(), "invariant"); |
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853 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 854 } |
855 | |
856 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
857 public: | |
858 bool doHeapRegion(HeapRegion* r) { | |
859 if (!r->continuesHumongous()) { | |
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860 r->note_start_of_marking(); |
342 | 861 } |
862 return false; | |
863 } | |
864 }; | |
865 | |
866 void ConcurrentMark::checkpointRootsInitialPre() { | |
867 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
868 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
869 | |
870 _has_aborted = false; | |
871 | |
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872 #ifndef PRODUCT |
1044 | 873 if (G1PrintReachableAtInitialMark) { |
1388 | 874 print_reachable("at-cycle-start", |
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875 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 876 } |
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877 #endif |
342 | 878 |
879 // Initialise marking structures. This has to be done in a STW phase. | |
880 reset(); | |
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881 |
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882 // For each region note start of marking. |
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883 NoteStartOfMarkHRClosure startcl; |
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884 g1h->heap_region_iterate(&startcl); |
342 | 885 } |
886 | |
887 | |
888 void ConcurrentMark::checkpointRootsInitialPost() { | |
889 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
890 | |
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891 // If we force an overflow during remark, the remark operation will |
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892 // actually abort and we'll restart concurrent marking. If we always |
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893 // force an oveflow during remark we'll never actually complete the |
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894 // marking phase. So, we initilize this here, at the start of the |
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895 // cycle, so that at the remaining overflow number will decrease at |
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896 // every remark and we'll eventually not need to cause one. |
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897 force_overflow_stw()->init(); |
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898 |
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899 // Start Concurrent Marking weak-reference discovery. |
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900 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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901 // enable ("weak") refs discovery |
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902 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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903 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 904 |
905 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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906 // This is the start of the marking cycle, we're expected all |
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907 // threads to have SATB queues with active set to false. |
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908 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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909 false /* expected_active */); |
342 | 910 |
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911 _root_regions.prepare_for_scan(); |
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912 |
342 | 913 // update_g1_committed() will be called at the end of an evac pause |
914 // when marking is on. So, it's also called at the end of the | |
915 // initial-mark pause to update the heap end, if the heap expands | |
916 // during it. No need to call it here. | |
917 } | |
918 | |
919 /* | |
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920 * Notice that in the next two methods, we actually leave the STS |
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921 * during the barrier sync and join it immediately afterwards. If we |
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922 * do not do this, the following deadlock can occur: one thread could |
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923 * be in the barrier sync code, waiting for the other thread to also |
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924 * sync up, whereas another one could be trying to yield, while also |
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925 * waiting for the other threads to sync up too. |
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926 * |
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927 * Note, however, that this code is also used during remark and in |
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928 * this case we should not attempt to leave / enter the STS, otherwise |
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929 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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930 * (product). So we should only leave / enter the STS if we are |
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931 * operating concurrently. |
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932 * |
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933 * Because the thread that does the sync barrier has left the STS, it |
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934 * is possible to be suspended for a Full GC or an evacuation pause |
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935 * could occur. This is actually safe, since the entering the sync |
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936 * barrier is one of the last things do_marking_step() does, and it |
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937 * doesn't manipulate any data structures afterwards. |
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938 */ |
342 | 939 |
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940 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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941 if (verbose_low()) { |
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942 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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943 } |
342 | 944 |
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945 if (concurrent()) { |
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946 ConcurrentGCThread::stsLeave(); |
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947 } |
342 | 948 _first_overflow_barrier_sync.enter(); |
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949 if (concurrent()) { |
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950 ConcurrentGCThread::stsJoin(); |
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951 } |
342 | 952 // at this point everyone should have synced up and not be doing any |
953 // more work | |
954 | |
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955 if (verbose_low()) { |
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956 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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957 } |
342 | 958 |
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959 // let the task associated with with worker 0 do this |
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960 if (worker_id == 0) { |
342 | 961 // task 0 is responsible for clearing the global data structures |
3316
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962 // We should be here because of an overflow. During STW we should |
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963 // not clear the overflow flag since we rely on it being true when |
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964 // we exit this method to abort the pause and restart concurent |
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965 // marking. |
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966 clear_marking_state(concurrent() /* clear_overflow */); |
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967 force_overflow()->update(); |
342 | 968 |
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969 if (G1Log::fine()) { |
342 | 970 gclog_or_tty->date_stamp(PrintGCDateStamps); |
971 gclog_or_tty->stamp(PrintGCTimeStamps); | |
972 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
973 } | |
974 } | |
975 | |
976 // after this, each task should reset its own data structures then | |
977 // then go into the second barrier | |
978 } | |
979 | |
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980 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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981 if (verbose_low()) { |
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982 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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983 } |
342 | 984 |
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985 if (concurrent()) { |
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986 ConcurrentGCThread::stsLeave(); |
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987 } |
342 | 988 _second_overflow_barrier_sync.enter(); |
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989 if (concurrent()) { |
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990 ConcurrentGCThread::stsJoin(); |
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991 } |
342 | 992 // at this point everything should be re-initialised and ready to go |
993 | |
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994 if (verbose_low()) { |
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995 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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996 } |
342 | 997 } |
998 | |
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999 #ifndef PRODUCT |
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1000 void ForceOverflowSettings::init() { |
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1001 _num_remaining = G1ConcMarkForceOverflow; |
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1002 _force = false; |
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1003 update(); |
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1004 } |
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1005 |
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1006 void ForceOverflowSettings::update() { |
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1007 if (_num_remaining > 0) { |
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1008 _num_remaining -= 1; |
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1009 _force = true; |
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1010 } else { |
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1011 _force = false; |
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1012 } |
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1013 } |
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1014 |
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1015 bool ForceOverflowSettings::should_force() { |
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1016 if (_force) { |
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1017 _force = false; |
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1018 return true; |
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1019 } else { |
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1020 return false; |
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1021 } |
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1022 } |
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1023 #endif // !PRODUCT |
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1024 |
342 | 1025 class CMConcurrentMarkingTask: public AbstractGangTask { |
1026 private: | |
1027 ConcurrentMark* _cm; | |
1028 ConcurrentMarkThread* _cmt; | |
1029 | |
1030 public: | |
4728
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1031 void work(uint worker_id) { |
1023
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1032 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1033 "this should only be done by a conc GC thread"); |
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1034 ResourceMark rm; |
342 | 1035 |
1036 double start_vtime = os::elapsedVTime(); | |
1037 | |
1038 ConcurrentGCThread::stsJoin(); | |
1039 | |
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1040 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1041 CMTask* the_task = _cm->task(worker_id); |
342 | 1042 the_task->record_start_time(); |
1043 if (!_cm->has_aborted()) { | |
1044 do { | |
1045 double start_vtime_sec = os::elapsedVTime(); | |
1046 double start_time_sec = os::elapsedTime(); | |
2174
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1047 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1048 |
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1049 the_task->do_marking_step(mark_step_duration_ms, |
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1050 true /* do_stealing */, |
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1051 true /* do_termination */); |
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1052 |
342 | 1053 double end_time_sec = os::elapsedTime(); |
1054 double end_vtime_sec = os::elapsedVTime(); | |
1055 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1056 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1057 _cm->clear_has_overflown(); | |
1058 | |
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1059 bool ret = _cm->do_yield_check(worker_id); |
342 | 1060 |
1061 jlong sleep_time_ms; | |
1062 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1063 sleep_time_ms = | |
1064 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1065 ConcurrentGCThread::stsLeave(); | |
1066 os::sleep(Thread::current(), sleep_time_ms, false); | |
1067 ConcurrentGCThread::stsJoin(); | |
1068 } | |
1069 double end_time2_sec = os::elapsedTime(); | |
1070 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1071 | |
1072 #if 0 | |
1073 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1074 "overhead %1.4lf", | |
1075 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1076 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1077 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1078 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1079 #endif | |
1080 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1081 } | |
1082 the_task->record_end_time(); | |
1023
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1083 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1084 |
1085 ConcurrentGCThread::stsLeave(); | |
1086 | |
1087 double end_vtime = os::elapsedVTime(); | |
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1088 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1089 } |
1090 | |
1091 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1092 ConcurrentMarkThread* cmt) : | |
1093 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1094 | |
1095 ~CMConcurrentMarkingTask() { } | |
1096 }; | |
1097 | |
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1098 // Calculates the number of active workers for a concurrent |
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1099 // phase. |
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1100 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1101 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
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1102 uint n_conc_workers = 0; |
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1103 if (!UseDynamicNumberOfGCThreads || |
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1104 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1105 !ForceDynamicNumberOfGCThreads)) { |
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1106 n_conc_workers = max_parallel_marking_threads(); |
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1107 } else { |
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1108 n_conc_workers = |
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1109 AdaptiveSizePolicy::calc_default_active_workers( |
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1110 max_parallel_marking_threads(), |
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1111 1, /* Minimum workers */ |
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1112 parallel_marking_threads(), |
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1113 Threads::number_of_non_daemon_threads()); |
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1114 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1115 // that scaling has already gone into "_max_parallel_marking_threads". |
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1116 } |
4711 | 1117 assert(n_conc_workers > 0, "Always need at least 1"); |
1118 return n_conc_workers; | |
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1119 } |
4711 | 1120 // If we are not running with any parallel GC threads we will not |
1121 // have spawned any marking threads either. Hence the number of | |
1122 // concurrent workers should be 0. | |
1123 return 0; | |
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1124 } |
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1125 |
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1126 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1127 // Currently, only survivors can be root regions. |
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1128 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1129 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1130 |
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1131 const uintx interval = PrefetchScanIntervalInBytes; |
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1132 HeapWord* curr = hr->bottom(); |
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1133 const HeapWord* end = hr->top(); |
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1134 while (curr < end) { |
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1135 Prefetch::read(curr, interval); |
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1136 oop obj = oop(curr); |
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1137 int size = obj->oop_iterate(&cl); |
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1138 assert(size == obj->size(), "sanity"); |
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1139 curr += size; |
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1140 } |
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1141 } |
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1142 |
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1143 class CMRootRegionScanTask : public AbstractGangTask { |
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1144 private: |
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1145 ConcurrentMark* _cm; |
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1146 |
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1147 public: |
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1148 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1149 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1150 |
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1151 void work(uint worker_id) { |
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1152 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1153 "this should only be done by a conc GC thread"); |
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1154 |
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1155 CMRootRegions* root_regions = _cm->root_regions(); |
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1156 HeapRegion* hr = root_regions->claim_next(); |
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1157 while (hr != NULL) { |
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1158 _cm->scanRootRegion(hr, worker_id); |
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1159 hr = root_regions->claim_next(); |
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1160 } |
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1161 } |
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1162 }; |
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1163 |
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1164 void ConcurrentMark::scanRootRegions() { |
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1165 // scan_in_progress() will have been set to true only if there was |
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1166 // at least one root region to scan. So, if it's false, we |
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1167 // should not attempt to do any further work. |
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1168 if (root_regions()->scan_in_progress()) { |
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1169 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1170 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1171 "Maximum number of marking threads exceeded"); |
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1172 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1173 |
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1174 CMRootRegionScanTask task(this); |
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1175 if (parallel_marking_threads() > 0) { |
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1176 _parallel_workers->set_active_workers((int) active_workers); |
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1177 _parallel_workers->run_task(&task); |
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1178 } else { |
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1179 task.work(0); |
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1180 } |
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1181 |
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1182 // It's possible that has_aborted() is true here without actually |
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1183 // aborting the survivor scan earlier. This is OK as it's |
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1184 // mainly used for sanity checking. |
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1185 root_regions()->scan_finished(); |
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1186 } |
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1187 } |
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1188 |
342 | 1189 void ConcurrentMark::markFromRoots() { |
1190 // we might be tempted to assert that: | |
1191 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1192 // "inconsistent argument?"); | |
1193 // However that wouldn't be right, because it's possible that | |
1194 // a safepoint is indeed in progress as a younger generation | |
1195 // stop-the-world GC happens even as we mark in this generation. | |
1196 | |
1197 _restart_for_overflow = false; | |
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1198 force_overflow_conc()->init(); |
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1199 |
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1200 // _g1h has _n_par_threads |
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1201 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1202 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1203 "Maximum number of marking threads exceeded"); |
4711 | 1204 |
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1205 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1206 |
1207 // Parallel task terminator is set in "set_phase()" | |
1208 set_phase(active_workers, true /* concurrent */); | |
342 | 1209 |
1210 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1211 if (parallel_marking_threads() > 0) { |
4711 | 1212 _parallel_workers->set_active_workers((int)active_workers); |
1213 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1214 // and the decisions on that MT processing is made elsewhere. | |
1215 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1216 _parallel_workers->run_task(&markingTask); |
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1217 } else { |
342 | 1218 markingTask.work(0); |
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1219 } |
342 | 1220 print_stats(); |
1221 } | |
1222 | |
1223 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1224 // world is stopped at this checkpoint | |
1225 assert(SafepointSynchronize::is_at_safepoint(), | |
1226 "world should be stopped"); | |
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1227 |
342 | 1228 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1229 | |
1230 // If a full collection has happened, we shouldn't do this. | |
1231 if (has_aborted()) { | |
1232 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1233 return; | |
1234 } | |
1235 | |
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1236 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1237 |
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1238 if (VerifyDuringGC) { |
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1239 HandleMark hm; // handle scope |
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1240 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1241 Universe::heap()->prepare_for_verify(); |
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1242 Universe::verify(/* silent */ false, |
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1243 /* option */ VerifyOption_G1UsePrevMarking); |
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1244 } |
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1245 |
342 | 1246 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1247 g1p->record_concurrent_mark_remark_start(); | |
1248 | |
1249 double start = os::elapsedTime(); | |
1250 | |
1251 checkpointRootsFinalWork(); | |
1252 | |
1253 double mark_work_end = os::elapsedTime(); | |
1254 | |
1255 weakRefsWork(clear_all_soft_refs); | |
1256 | |
1257 if (has_overflown()) { | |
1258 // Oops. We overflowed. Restart concurrent marking. | |
1259 _restart_for_overflow = true; | |
1260 // Clear the flag. We do not need it any more. | |
1261 clear_has_overflown(); | |
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1262 if (G1TraceMarkStackOverflow) { |
342 | 1263 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1264 } |
342 | 1265 } else { |
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1266 // Aggregate the per-task counting data that we have accumulated |
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1267 // while marking. |
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1268 aggregate_count_data(); |
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1269 |
2149 | 1270 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1271 // We're done with marking. |
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1272 // This is the end of the marking cycle, we're expected all |
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1273 // threads to have SATB queues with active set to true. |
2149 | 1274 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1275 true /* expected_active */); | |
811 | 1276 |
1277 if (VerifyDuringGC) { | |
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1278 HandleMark hm; // handle scope |
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1279 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1280 Universe::heap()->prepare_for_verify(); |
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1281 Universe::verify(/* silent */ false, |
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1282 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1283 } |
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1284 assert(!restart_for_overflow(), "sanity"); |
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1285 } |
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1286 |
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1287 // Expand the marking stack, if we have to and if we can. |
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1288 if (_markStack.should_expand()) { |
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1289 _markStack.expand(); |
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1290 } |
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1291 |
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1292 // Reset the marking state if marking completed |
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1293 if (!restart_for_overflow()) { |
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1294 set_non_marking_state(); |
342 | 1295 } |
1296 | |
1297 #if VERIFY_OBJS_PROCESSED | |
1298 _scan_obj_cl.objs_processed = 0; | |
1299 ThreadLocalObjQueue::objs_enqueued = 0; | |
1300 #endif | |
1301 | |
1302 // Statistics | |
1303 double now = os::elapsedTime(); | |
1304 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1305 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1306 _remark_times.add((now - start) * 1000.0); | |
1307 | |
1308 g1p->record_concurrent_mark_remark_end(); | |
1309 } | |
1310 | |
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1311 // Base class of the closures that finalize and verify the |
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1312 // liveness counting data. |
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1313 class CMCountDataClosureBase: public HeapRegionClosure { |
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1314 protected: |
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1315 G1CollectedHeap* _g1h; |
342 | 1316 ConcurrentMark* _cm; |
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1317 CardTableModRefBS* _ct_bs; |
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1318 |
342 | 1319 BitMap* _region_bm; |
1320 BitMap* _card_bm; | |
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1321 |
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1322 // Takes a region that's not empty (i.e., it has at least one |
829 | 1323 // live object in it and sets its corresponding bit on the region |
1324 // bitmap to 1. If the region is "starts humongous" it will also set | |
1325 // to 1 the bits on the region bitmap that correspond to its | |
1326 // associated "continues humongous" regions. | |
1327 void set_bit_for_region(HeapRegion* hr) { | |
1328 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1329 | |
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1330 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1331 if (!hr->startsHumongous()) { |
1332 // Normal (non-humongous) case: just set the bit. | |
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1333 _region_bm->par_at_put(index, true); |
829 | 1334 } else { |
1335 // Starts humongous case: calculate how many regions are part of | |
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1336 // this humongous region and then set the bit range. |
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1337 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1338 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1339 } |
1340 } | |
1341 | |
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1342 public: |
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1343 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1344 BitMap* region_bm, BitMap* card_bm): |
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1345 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1346 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1347 _region_bm(region_bm), _card_bm(card_bm) { } |
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1348 }; |
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1349 |
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1350 // Closure that calculates the # live objects per region. Used |
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1351 // for verification purposes during the cleanup pause. |
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1352 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1353 CMBitMapRO* _bm; |
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1354 size_t _region_marked_bytes; |
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1355 |
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1356 public: |
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1357 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1358 BitMap* region_bm, BitMap* card_bm) : |
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1359 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1360 _bm(bm), _region_marked_bytes(0) { } |
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1361 |
342 | 1362 bool doHeapRegion(HeapRegion* hr) { |
1363 | |
639 | 1364 if (hr->continuesHumongous()) { |
829 | 1365 // We will ignore these here and process them when their |
1366 // associated "starts humongous" region is processed (see | |
1367 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1368 // associated "starts humongous" region to have their bit set to | |
1369 // 1 since, due to the region chunking in the parallel region | |
1370 // iteration, a "continues humongous" region might be visited | |
1371 // before its associated "starts humongous". | |
639 | 1372 return false; |
1373 } | |
342 | 1374 |
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1375 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1376 HeapWord* start = hr->bottom(); |
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1377 |
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1378 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1379 err_msg("Preconditions not met - " |
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1380 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1381 start, ntams, hr->end())); |
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1382 |
342 | 1383 // Find the first marked object at or after "start". |
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1384 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1385 |
342 | 1386 size_t marked_bytes = 0; |
1387 | |
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1388 while (start < ntams) { |
342 | 1389 oop obj = oop(start); |
1390 int obj_sz = obj->size(); | |
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1391 HeapWord* obj_end = start + obj_sz; |
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1392 |
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1393 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1394 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1395 |
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1396 // Note: if we're looking at the last region in heap - obj_end |
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1397 // could be actually just beyond the end of the heap; end_idx |
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1398 // will then correspond to a (non-existent) card that is also |
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1399 // just beyond the heap. |
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1400 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1401 // end of object is not card aligned - increment to cover |
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1402 // all the cards spanned by the object |
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1403 end_idx += 1; |
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1404 } |
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1405 |
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1406 // Set the bits in the card BM for the cards spanned by this object. |
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1407 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1408 |
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1409 // Add the size of this object to the number of marked bytes. |
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1410 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1411 |
342 | 1412 // Find the next marked object after this one. |
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1413 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1414 } |
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1415 |
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1416 // Mark the allocated-since-marking portion... |
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1417 HeapWord* top = hr->top(); |
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1418 if (ntams < top) { |
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1419 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1420 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1421 |
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1422 // Note: if we're looking at the last region in heap - top |
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1423 // could be actually just beyond the end of the heap; end_idx |
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1424 // will then correspond to a (non-existent) card that is also |
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1425 // just beyond the heap. |
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1426 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1427 // end of object is not card aligned - increment to cover |
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1428 // all the cards spanned by the object |
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1429 end_idx += 1; |
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1430 } |
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1431 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1432 |
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1433 // This definitely means the region has live objects. |
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1434 set_bit_for_region(hr); |
342 | 1435 } |
1436 | |
1437 // Update the live region bitmap. | |
1438 if (marked_bytes > 0) { | |
829 | 1439 set_bit_for_region(hr); |
342 | 1440 } |
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1441 |
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1442 // Set the marked bytes for the current region so that |
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1443 // it can be queried by a calling verificiation routine |
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1444 _region_marked_bytes = marked_bytes; |
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1445 |
342 | 1446 return false; |
1447 } | |
1448 | |
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1449 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1450 }; |
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1451 |
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1452 // Heap region closure used for verifying the counting data |
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1453 // that was accumulated concurrently and aggregated during |
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1454 // the remark pause. This closure is applied to the heap |
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1455 // regions during the STW cleanup pause. |
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1456 |
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1457 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1458 G1CollectedHeap* _g1h; |
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1459 ConcurrentMark* _cm; |
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1460 CalcLiveObjectsClosure _calc_cl; |
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1461 BitMap* _region_bm; // Region BM to be verified |
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1462 BitMap* _card_bm; // Card BM to be verified |
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1463 bool _verbose; // verbose output? |
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1464 |
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1465 BitMap* _exp_region_bm; // Expected Region BM values |
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1466 BitMap* _exp_card_bm; // Expected card BM values |
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1467 |
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1468 int _failures; |
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1469 |
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1470 public: |
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1471 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1472 BitMap* region_bm, |
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1473 BitMap* card_bm, |
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1474 BitMap* exp_region_bm, |
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1475 BitMap* exp_card_bm, |
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1476 bool verbose) : |
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1477 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1478 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1479 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1480 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1481 _failures(0) { } |
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1482 |
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1483 int failures() const { return _failures; } |
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1484 |
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1485 bool doHeapRegion(HeapRegion* hr) { |
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1486 if (hr->continuesHumongous()) { |
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1487 // We will ignore these here and process them when their |
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1488 // associated "starts humongous" region is processed (see |
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1489 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1490 // associated "starts humongous" region to have their bit set to |
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1491 // 1 since, due to the region chunking in the parallel region |
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1492 // iteration, a "continues humongous" region might be visited |
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1493 // before its associated "starts humongous". |
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1494 return false; |
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1495 } |
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1496 |
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1497 int failures = 0; |
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1498 |
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1499 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1500 // this region and set the corresponding bits in the expected region |
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1501 // and card bitmaps. |
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1502 bool res = _calc_cl.doHeapRegion(hr); |
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1503 assert(res == false, "should be continuing"); |
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1504 |
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1505 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1506 Mutex::_no_safepoint_check_flag); |
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1507 |
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1508 // Verify the marked bytes for this region. |
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1509 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1510 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1511 |
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1512 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1513 // we have missed accounting some objects during the actual marking. |
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1514 if (exp_marked_bytes > act_marked_bytes) { |
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1515 if (_verbose) { |
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1516 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1517 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1518 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1519 } |
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1520 failures += 1; |
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1521 } |
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1522 |
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1523 // Verify the bit, for this region, in the actual and expected |
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1524 // (which was just calculated) region bit maps. |
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1525 // We're not OK if the bit in the calculated expected region |
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1526 // bitmap is set and the bit in the actual region bitmap is not. |
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1527 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
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1528 |
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1529 bool expected = _exp_region_bm->at(index); |
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1530 bool actual = _region_bm->at(index); |
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1531 if (expected && !actual) { |
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1532 if (_verbose) { |
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1533 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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|
1534 "expected: %s, actual: %s", |
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1535 hr->hrs_index(), |
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1536 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1537 } |
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|
1538 failures += 1; |
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|
1539 } |
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|
1540 |
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1541 // Verify that the card bit maps for the cards spanned by the current |
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1542 // region match. We have an error if we have a set bit in the expected |
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1543 // bit map and the corresponding bit in the actual bitmap is not set. |
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1544 |
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1545 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1546 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1547 |
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1548 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1549 expected = _exp_card_bm->at(i); |
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|
1550 actual = _card_bm->at(i); |
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|
1551 |
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1552 if (expected && !actual) { |
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1553 if (_verbose) { |
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|
1554 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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|
1555 "expected: %s, actual: %s", |
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|
1556 hr->hrs_index(), i, |
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|
1557 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
4836
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|
1558 } |
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|
1559 failures += 1; |
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|
1560 } |
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|
1561 } |
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|
1562 |
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|
1563 if (failures > 0 && _verbose) { |
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|
1564 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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|
1565 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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|
1566 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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|
1567 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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|
1568 } |
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|
1569 |
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|
1570 _failures += failures; |
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|
1571 |
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|
1572 // We could stop iteration over the heap when we |
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7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1573 // find the first violating region by returning true. |
4836
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1574 return false; |
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|
1575 } |
342 | 1576 }; |
1577 | |
1578 | |
4836
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|
1579 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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|
1580 protected: |
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|
1581 G1CollectedHeap* _g1h; |
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|
1582 ConcurrentMark* _cm; |
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|
1583 BitMap* _actual_region_bm; |
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|
1584 BitMap* _actual_card_bm; |
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|
1585 |
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|
1586 uint _n_workers; |
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|
1587 |
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|
1588 BitMap* _expected_region_bm; |
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|
1589 BitMap* _expected_card_bm; |
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|
1590 |
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|
1591 int _failures; |
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|
1592 bool _verbose; |
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|
1593 |
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|
1594 public: |
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|
1595 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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|
1596 BitMap* region_bm, BitMap* card_bm, |
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|
1597 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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|
1598 : AbstractGangTask("G1 verify final counting"), |
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|
1599 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1600 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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|
1601 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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|
1602 _failures(0), _verbose(false), |
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|
1603 _n_workers(0) { |
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1604 assert(VerifyDuringGC, "don't call this otherwise"); |
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1605 |
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1606 // Use the value already set as the number of active threads |
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|
1607 // in the call to run_task(). |
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1608 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1609 assert( _g1h->workers()->active_workers() > 0, |
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1610 "Should have been previously set"); |
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1611 _n_workers = _g1h->workers()->active_workers(); |
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|
1612 } else { |
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1613 _n_workers = 1; |
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|
1614 } |
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|
1615 |
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1616 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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1617 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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1618 |
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1619 _verbose = _cm->verbose_medium(); |
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|
1620 } |
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|
1621 |
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1622 void work(uint worker_id) { |
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1623 assert(worker_id < _n_workers, "invariant"); |
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1624 |
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1625 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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1626 _actual_region_bm, _actual_card_bm, |
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1627 _expected_region_bm, |
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1628 _expected_card_bm, |
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1629 _verbose); |
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|
1630 |
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1631 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1632 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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1633 worker_id, |
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1634 _n_workers, |
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1635 HeapRegion::VerifyCountClaimValue); |
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1636 } else { |
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1637 _g1h->heap_region_iterate(&verify_cl); |
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1638 } |
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|
1639 |
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1640 Atomic::add(verify_cl.failures(), &_failures); |
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1641 } |
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|
1642 |
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1643 int failures() const { return _failures; } |
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1644 }; |
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|
1645 |
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1646 // Closure that finalizes the liveness counting data. |
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1647 // Used during the cleanup pause. |
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1648 // Sets the bits corresponding to the interval [NTAMS, top] |
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1649 // (which contains the implicitly live objects) in the |
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1650 // card liveness bitmap. Also sets the bit for each region, |
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1651 // containing live data, in the region liveness bitmap. |
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1652 |
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|
1653 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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1654 public: |
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1655 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
4836
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1656 BitMap* region_bm, |
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1657 BitMap* card_bm) : |
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1658 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1659 |
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|
1660 bool doHeapRegion(HeapRegion* hr) { |
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|
1661 |
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1662 if (hr->continuesHumongous()) { |
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1663 // We will ignore these here and process them when their |
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1664 // associated "starts humongous" region is processed (see |
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1665 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1666 // associated "starts humongous" region to have their bit set to |
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1667 // 1 since, due to the region chunking in the parallel region |
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1668 // iteration, a "continues humongous" region might be visited |
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1669 // before its associated "starts humongous". |
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|
1670 return false; |
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|
1671 } |
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|
1672 |
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|
1673 HeapWord* ntams = hr->next_top_at_mark_start(); |
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|
1674 HeapWord* top = hr->top(); |
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|
1675 |
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|
1676 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1677 |
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|
1678 // Mark the allocated-since-marking portion... |
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|
1679 if (ntams < top) { |
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|
1680 // This definitely means the region has live objects. |
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|
1681 set_bit_for_region(hr); |
6812
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|
1682 |
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|
1683 // Now set the bits in the card bitmap for [ntams, top) |
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|
1684 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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|
1685 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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|
1686 |
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|
1687 // Note: if we're looking at the last region in heap - top |
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|
1688 // could be actually just beyond the end of the heap; end_idx |
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|
1689 // will then correspond to a (non-existent) card that is also |
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|
1690 // just beyond the heap. |
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|
1691 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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|
1692 // end of object is not card aligned - increment to cover |
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diff
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|
1693 // all the cards spanned by the object |
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|
1694 end_idx += 1; |
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|
1695 } |
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|
1696 |
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|
1697 assert(end_idx <= _card_bm->size(), |
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|
1698 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1699 end_idx, _card_bm->size())); |
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|
1700 assert(start_idx < _card_bm->size(), |
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|
1701 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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diff
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|
1702 start_idx, _card_bm->size())); |
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|
1703 |
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|
1704 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
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1705 } |
4836
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|
1706 |
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|
1707 // Set the bit for the region if it contains live data |
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|
1708 if (hr->next_marked_bytes() > 0) { |
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|
1709 set_bit_for_region(hr); |
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|
1710 } |
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|
1711 |
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|
1712 return false; |
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|
1713 } |
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|
1714 }; |
342 | 1715 |
1716 class G1ParFinalCountTask: public AbstractGangTask { | |
1717 protected: | |
1718 G1CollectedHeap* _g1h; | |
4836
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|
1719 ConcurrentMark* _cm; |
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|
1720 BitMap* _actual_region_bm; |
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|
1721 BitMap* _actual_card_bm; |
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|
1722 |
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|
1723 uint _n_workers; |
4836
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|
1724 |
342 | 1725 public: |
4836
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1726 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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|
1727 : AbstractGangTask("G1 final counting"), |
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|
1728 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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|
1729 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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|
1730 _n_workers(0) { |
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|
1731 // Use the value already set as the number of active threads |
6011 | 1732 // in the call to run_task(). |
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|
1733 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1734 assert( _g1h->workers()->active_workers() > 0, |
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1735 "Should have been previously set"); |
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1736 _n_workers = _g1h->workers()->active_workers(); |
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1737 } else { |
342 | 1738 _n_workers = 1; |
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1739 } |
342 | 1740 } |
1741 | |
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1742 void work(uint worker_id) { |
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1743 assert(worker_id < _n_workers, "invariant"); |
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1744 |
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1745 FinalCountDataUpdateClosure final_update_cl(_g1h, |
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1746 _actual_region_bm, |
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1747 _actual_card_bm); |
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1748 |
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1749 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1750 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1751 worker_id, |
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1752 _n_workers, |
355 | 1753 HeapRegion::FinalCountClaimValue); |
342 | 1754 } else { |
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1755 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1756 } |
1757 } | |
1758 }; | |
1759 | |
1760 class G1ParNoteEndTask; | |
1761 | |
1762 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1763 G1CollectedHeap* _g1; | |
1764 int _worker_num; | |
1765 size_t _max_live_bytes; | |
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1766 uint _regions_claimed; |
342 | 1767 size_t _freed_bytes; |
2173 | 1768 FreeRegionList* _local_cleanup_list; |
4072 | 1769 OldRegionSet* _old_proxy_set; |
2173 | 1770 HumongousRegionSet* _humongous_proxy_set; |
1771 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1772 double _claimed_region_time; |
1773 double _max_region_time; | |
1774 | |
1775 public: | |
1776 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1777 int worker_num, |
1778 FreeRegionList* local_cleanup_list, | |
4072 | 1779 OldRegionSet* old_proxy_set, |
2173 | 1780 HumongousRegionSet* humongous_proxy_set, |
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1781 HRRSCleanupTask* hrrs_cleanup_task) : |
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1782 _g1(g1), _worker_num(worker_num), |
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1783 _max_live_bytes(0), _regions_claimed(0), |
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1784 _freed_bytes(0), |
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1785 _claimed_region_time(0.0), _max_region_time(0.0), |
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1786 _local_cleanup_list(local_cleanup_list), |
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1787 _old_proxy_set(old_proxy_set), |
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1788 _humongous_proxy_set(humongous_proxy_set), |
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1789 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1790 |
342 | 1791 size_t freed_bytes() { return _freed_bytes; } |
1792 | |
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1793 bool doHeapRegion(HeapRegion *hr) { |
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1794 if (hr->continuesHumongous()) { |
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1795 return false; |
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1796 } |
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1797 // We use a claim value of zero here because all regions |
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1798 // were claimed with value 1 in the FinalCount task. |
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1799 _g1->reset_gc_time_stamps(hr); |
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1800 double start = os::elapsedTime(); |
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1801 _regions_claimed++; |
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1802 hr->note_end_of_marking(); |
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1803 _max_live_bytes += hr->max_live_bytes(); |
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1804 _g1->free_region_if_empty(hr, |
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1805 &_freed_bytes, |
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1806 _local_cleanup_list, |
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1807 _old_proxy_set, |
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1808 _humongous_proxy_set, |
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1809 _hrrs_cleanup_task, |
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1810 true /* par */); |
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1811 double region_time = (os::elapsedTime() - start); |
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1812 _claimed_region_time += region_time; |
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1813 if (region_time > _max_region_time) { |
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1814 _max_region_time = region_time; |
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1815 } |
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1816 return false; |
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1817 } |
342 | 1818 |
1819 size_t max_live_bytes() { return _max_live_bytes; } | |
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1820 uint regions_claimed() { return _regions_claimed; } |
342 | 1821 double claimed_region_time_sec() { return _claimed_region_time; } |
1822 double max_region_time_sec() { return _max_region_time; } | |
1823 }; | |
1824 | |
1825 class G1ParNoteEndTask: public AbstractGangTask { | |
1826 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1827 |
342 | 1828 protected: |
1829 G1CollectedHeap* _g1h; | |
1830 size_t _max_live_bytes; | |
1831 size_t _freed_bytes; | |
2152 | 1832 FreeRegionList* _cleanup_list; |
1833 | |
342 | 1834 public: |
1835 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1836 FreeRegionList* cleanup_list) : |
342 | 1837 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1838 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1839 |
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1840 void work(uint worker_id) { |
342 | 1841 double start = os::elapsedTime(); |
2173 | 1842 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1843 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1844 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1845 HRRSCleanupTask hrrs_cleanup_task; | |
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1846 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1847 &old_proxy_set, |
2173 | 1848 &humongous_proxy_set, |
1849 &hrrs_cleanup_task); | |
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1850 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1851 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1852 _g1h->workers()->active_workers(), |
355 | 1853 HeapRegion::NoteEndClaimValue); |
342 | 1854 } else { |
1855 _g1h->heap_region_iterate(&g1_note_end); | |
1856 } | |
1857 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1858 | |
2152 | 1859 // Now update the lists |
1860 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1861 NULL /* free_list */, | |
4072 | 1862 &old_proxy_set, |
2173 | 1863 &humongous_proxy_set, |
2152 | 1864 true /* par */); |
342 | 1865 { |
1866 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1867 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1868 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1869 |
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1870 // If we iterate over the global cleanup list at the end of |
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1871 // cleanup to do this printing we will not guarantee to only |
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1872 // generate output for the newly-reclaimed regions (the list |
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1873 // might not be empty at the beginning of cleanup; we might |
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1874 // still be working on its previous contents). So we do the |
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1875 // printing here, before we append the new regions to the global |
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1876 // cleanup list. |
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1877 |
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1878 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1879 if (hr_printer->is_active()) { |
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1880 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1881 while (iter.more_available()) { |
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1882 HeapRegion* hr = iter.get_next(); |
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1883 hr_printer->cleanup(hr); |
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1884 } |
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1885 } |
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1886 |
2173 | 1887 _cleanup_list->add_as_tail(&local_cleanup_list); |
1888 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1889 | |
1890 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1891 } |
1892 } | |
1893 size_t max_live_bytes() { return _max_live_bytes; } | |
1894 size_t freed_bytes() { return _freed_bytes; } | |
1895 }; | |
1896 | |
1897 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1898 protected: | |
1899 G1RemSet* _g1rs; | |
1900 BitMap* _region_bm; | |
1901 BitMap* _card_bm; | |
1902 public: | |
1903 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1904 BitMap* region_bm, BitMap* card_bm) : | |
1905 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1906 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1907 |
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1908 void work(uint worker_id) { |
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1909 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1910 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1911 HeapRegion::ScrubRemSetClaimValue); |
342 | 1912 } else { |
1913 _g1rs->scrub(_region_bm, _card_bm); | |
1914 } | |
1915 } | |
1916 | |
1917 }; | |
1918 | |
1919 void ConcurrentMark::cleanup() { | |
1920 // world is stopped at this checkpoint | |
1921 assert(SafepointSynchronize::is_at_safepoint(), | |
1922 "world should be stopped"); | |
1923 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1924 | |
1925 // If a full collection has happened, we shouldn't do this. | |
1926 if (has_aborted()) { | |
1927 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1928 return; | |
1929 } | |
1930 | |
4072 | 1931 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1932 g1h->verify_region_sets_optional(); |
1933 | |
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1934 if (VerifyDuringGC) { |
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1935 HandleMark hm; // handle scope |
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1936 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1937 Universe::heap()->prepare_for_verify(); |
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1938 Universe::verify(/* silent */ false, |
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1939 /* option */ VerifyOption_G1UsePrevMarking); |
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1940 } |
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1941 |
342 | 1942 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1943 g1p->record_concurrent_mark_cleanup_start(); | |
1944 | |
1945 double start = os::elapsedTime(); | |
1946 | |
2173 | 1947 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1948 | |
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1949 uint n_workers; |
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1950 |
342 | 1951 // Do counting once more with the world stopped for good measure. |
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1952 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1953 |
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1954 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1955 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1956 "sanity check"); |
1957 | |
4711 | 1958 g1h->set_par_threads(); |
1959 n_workers = g1h->n_par_threads(); | |
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1960 assert(g1h->n_par_threads() == n_workers, |
4711 | 1961 "Should not have been reset"); |
342 | 1962 g1h->workers()->run_task(&g1_par_count_task); |
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1963 // Done with the parallel phase so reset to 0. |
342 | 1964 g1h->set_par_threads(0); |
355 | 1965 |
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1966 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 1967 "sanity check"); |
342 | 1968 } else { |
4711 | 1969 n_workers = 1; |
342 | 1970 g1_par_count_task.work(0); |
1971 } | |
1972 | |
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1973 if (VerifyDuringGC) { |
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1974 // Verify that the counting data accumulated during marking matches |
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1975 // that calculated by walking the marking bitmap. |
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1976 |
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1977 // Bitmaps to hold expected values |
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1978 BitMap expected_region_bm(_region_bm.size(), false); |
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1979 BitMap expected_card_bm(_card_bm.size(), false); |
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1980 |
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1981 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1982 &_region_bm, |
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1983 &_card_bm, |
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1984 &expected_region_bm, |
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1985 &expected_card_bm); |
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1986 |
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1987 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1988 g1h->set_par_threads((int)n_workers); |
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1989 g1h->workers()->run_task(&g1_par_verify_task); |
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1990 // Done with the parallel phase so reset to 0. |
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1991 g1h->set_par_threads(0); |
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1992 |
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1993 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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1994 "sanity check"); |
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1995 } else { |
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1996 g1_par_verify_task.work(0); |
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1997 } |
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1998 |
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1999 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2000 } |
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2001 |
342 | 2002 size_t start_used_bytes = g1h->used(); |
2003 g1h->set_marking_complete(); | |
2004 | |
2005 double count_end = os::elapsedTime(); | |
2006 double this_final_counting_time = (count_end - start); | |
2007 _total_counting_time += this_final_counting_time; | |
2008 | |
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2009 if (G1PrintRegionLivenessInfo) { |
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2010 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2011 _g1h->heap_region_iterate(&cl); |
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2012 } |
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2013 |
342 | 2014 // Install newly created mark bitMap as "prev". |
2015 swapMarkBitMaps(); | |
2016 | |
2017 g1h->reset_gc_time_stamp(); | |
2018 | |
2019 // Note end of marking in all heap regions. | |
2152 | 2020 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2021 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2022 g1h->set_par_threads((int)n_workers); |
342 | 2023 g1h->workers()->run_task(&g1_par_note_end_task); |
2024 g1h->set_par_threads(0); | |
355 | 2025 |
2026 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2027 "sanity check"); | |
342 | 2028 } else { |
2029 g1_par_note_end_task.work(0); | |
2030 } | |
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2031 g1h->check_gc_time_stamps(); |
2152 | 2032 |
2033 if (!cleanup_list_is_empty()) { | |
2034 // The cleanup list is not empty, so we'll have to process it | |
2035 // concurrently. Notify anyone else that might be wanting free | |
2036 // regions that there will be more free regions coming soon. | |
2037 g1h->set_free_regions_coming(); | |
2038 } | |
342 | 2039 |
2040 // call below, since it affects the metric by which we sort the heap | |
2041 // regions. | |
2042 if (G1ScrubRemSets) { | |
2043 double rs_scrub_start = os::elapsedTime(); | |
2044 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2045 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2046 g1h->set_par_threads((int)n_workers); |
342 | 2047 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2048 g1h->set_par_threads(0); | |
355 | 2049 |
2050 assert(g1h->check_heap_region_claim_values( | |
2051 HeapRegion::ScrubRemSetClaimValue), | |
2052 "sanity check"); | |
342 | 2053 } else { |
2054 g1_par_scrub_rs_task.work(0); | |
2055 } | |
2056 | |
2057 double rs_scrub_end = os::elapsedTime(); | |
2058 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2059 _total_rs_scrub_time += this_rs_scrub_time; | |
2060 } | |
2061 | |
2062 // this will also free any regions totally full of garbage objects, | |
2063 // and sort the regions. | |
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2064 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2065 |
2066 // Statistics. | |
2067 double end = os::elapsedTime(); | |
2068 _cleanup_times.add((end - start) * 1000.0); | |
2069 | |
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2070 if (G1Log::fine()) { |
342 | 2071 g1h->print_size_transition(gclog_or_tty, |
2072 start_used_bytes, | |
2073 g1h->used(), | |
2074 g1h->capacity()); | |
2075 } | |
2076 | |
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2077 // Clean up will have freed any regions completely full of garbage. |
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2078 // Update the soft reference policy with the new heap occupancy. |
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2079 Universe::update_heap_info_at_gc(); |
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2080 |
342 | 2081 // We need to make this be a "collection" so any collection pause that |
2082 // races with it goes around and waits for completeCleanup to finish. | |
2083 g1h->increment_total_collections(); | |
2084 | |
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2085 // We reclaimed old regions so we should calculate the sizes to make |
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2086 // sure we update the old gen/space data. |
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2087 g1h->g1mm()->update_sizes(); |
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2088 |
751 | 2089 if (VerifyDuringGC) { |
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2090 HandleMark hm; // handle scope |
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2091 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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2092 Universe::heap()->prepare_for_verify(); |
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|
2093 Universe::verify(/* silent */ false, |
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2094 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 2095 } |
2152 | 2096 |
2097 g1h->verify_region_sets_optional(); | |
342 | 2098 } |
2099 | |
2100 void ConcurrentMark::completeCleanup() { | |
2101 if (has_aborted()) return; | |
2102 | |
2152 | 2103 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2104 | |
2105 _cleanup_list.verify_optional(); | |
2361 | 2106 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2107 |
2108 if (G1ConcRegionFreeingVerbose) { | |
2109 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
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2110 "cleanup list has %u entries", |
2152 | 2111 _cleanup_list.length()); |
2112 } | |
2113 | |
2114 // Noone else should be accessing the _cleanup_list at this point, | |
2115 // so it's not necessary to take any locks | |
2116 while (!_cleanup_list.is_empty()) { | |
2117 HeapRegion* hr = _cleanup_list.remove_head(); | |
2118 assert(hr != NULL, "the list was not empty"); | |
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2119 hr->par_clear(); |
2361 | 2120 tmp_free_list.add_as_tail(hr); |
2152 | 2121 |
2122 // Instead of adding one region at a time to the secondary_free_list, | |
2123 // we accumulate them in the local list and move them a few at a | |
2124 // time. This also cuts down on the number of notify_all() calls | |
2125 // we do during this process. We'll also append the local list when | |
2126 // _cleanup_list is empty (which means we just removed the last | |
2127 // region from the _cleanup_list). | |
2361 | 2128 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2129 _cleanup_list.is_empty()) { |
2130 if (G1ConcRegionFreeingVerbose) { | |
2131 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
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2132 "appending %u entries to the secondary_free_list, " |
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2133 "cleanup list still has %u entries", |
2361 | 2134 tmp_free_list.length(), |
2152 | 2135 _cleanup_list.length()); |
342 | 2136 } |
2152 | 2137 |
2138 { | |
2139 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2140 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2141 SecondaryFreeList_lock->notify_all(); |
2142 } | |
2143 | |
2144 if (G1StressConcRegionFreeing) { | |
2145 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2146 os::sleep(Thread::current(), (jlong) 1, false); | |
2147 } | |
2148 } | |
342 | 2149 } |
2150 } | |
2361 | 2151 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2152 } |
2153 | |
2174
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2154 // Support closures for reference procssing in G1 |
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2155 |
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|
2156 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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2157 HeapWord* addr = (HeapWord*)obj; |
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|
2158 return addr != NULL && |
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diff
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|
2159 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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|
2160 } |
342 | 2161 |
6725
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2162 class G1CMKeepAliveClosure: public ExtendedOopClosure { |
342 | 2163 G1CollectedHeap* _g1; |
2164 ConcurrentMark* _cm; | |
2165 public: | |
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2166 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
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2167 _g1(g1), _cm(cm) { |
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2168 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
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2169 } |
342 | 2170 |
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2171 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2172 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2173 |
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2174 template <class T> void do_oop_work(T* p) { |
2174
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2175 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2176 HeapWord* addr = (HeapWord*)obj; |
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2177 |
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2178 if (_cm->verbose_high()) { |
2174
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|
2179 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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2180 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2181 p, (void*) obj); |
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2182 } |
2174
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2183 |
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2184 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
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2185 _cm->mark_and_count(obj); |
2174
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2186 _cm->mark_stack_push(obj); |
342 | 2187 } |
2188 } | |
2189 }; | |
2190 | |
2191 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
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2192 ConcurrentMark* _cm; |
342 | 2193 CMMarkStack* _markStack; |
2194 G1CMKeepAliveClosure* _oopClosure; | |
2195 public: | |
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2196 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
342 | 2197 G1CMKeepAliveClosure* oopClosure) : |
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2198 _cm(cm), |
342 | 2199 _markStack(markStack), |
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2200 _oopClosure(oopClosure) { } |
342 | 2201 |
2202 void do_void() { | |
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2203 _markStack->drain(_oopClosure, _cm->nextMarkBitMap(), false); |
342 | 2204 } |
2205 }; | |
2206 | |
2174
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2207 // 'Keep Alive' closure used by parallel reference processing. |
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2208 // An instance of this closure is used in the parallel reference processing |
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2209 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2210 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2211 // placed on to discovered ref lists once so we can mark and push with no |
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2212 // need to check whether the object has already been marked. Using the |
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2213 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2214 // operating on the global mark stack. This means that an individual |
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2215 // worker would be doing lock-free pushes while it processes its own |
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2216 // discovered ref list followed by drain call. If the discovered ref lists |
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2217 // are unbalanced then this could cause interference with the other |
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2218 // workers. Using a CMTask (and its embedded local data structures) |
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2219 // avoids that potential interference. |
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2220 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2221 ConcurrentMark* _cm; |
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2222 CMTask* _task; |
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2223 int _ref_counter_limit; |
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2224 int _ref_counter; |
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2225 public: |
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2226 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2227 _cm(cm), _task(task), |
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2228 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
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2229 assert(_ref_counter_limit > 0, "sanity"); |
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2230 _ref_counter = _ref_counter_limit; |
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2231 } |
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2232 |
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2233 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2234 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2235 |
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2236 template <class T> void do_oop_work(T* p) { |
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2237 if (!_cm->has_overflown()) { |
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2238 oop obj = oopDesc::load_decode_heap_oop(p); |
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2239 if (_cm->verbose_high()) { |
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2240 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
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2241 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2242 _task->worker_id(), p, (void*) obj); |
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2243 } |
2174
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2244 |
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2245 _task->deal_with_reference(obj); |
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2246 _ref_counter--; |
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2247 |
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2248 if (_ref_counter == 0) { |
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2249 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2250 // reachable from them on to the local stack (and possibly the global stack). |
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2251 // Call do_marking_step() to process these entries. We call the routine in a |
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2252 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2253 // with the entries that we've pushed as a result of the deal_with_reference |
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2254 // calls above) or we overflow. |
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2255 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2256 // while there may still be some work to do. (See the comment at the |
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2257 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2258 // is reaching the specified time target.) It is only when |
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2259 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2260 // that the marking has completed. |
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2261 do { |
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2262 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2263 _task->do_marking_step(mark_step_duration_ms, |
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2264 false /* do_stealing */, |
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2265 false /* do_termination */); |
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2266 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2267 _ref_counter = _ref_counter_limit; |
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2268 } |
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2269 } else { |
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|
2270 if (_cm->verbose_high()) { |
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2271 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
3776
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2272 } |
2174
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2273 } |
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2274 } |
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|
2275 }; |
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|
2276 |
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2277 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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|
2278 ConcurrentMark* _cm; |
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|
2279 CMTask* _task; |
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|
2280 public: |
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|
2281 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2282 _cm(cm), _task(task) { } |
2174
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2283 |
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|
2284 void do_void() { |
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2285 do { |
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2286 if (_cm->verbose_high()) { |
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2287 gclog_or_tty->print_cr("\t[%u] Drain: Calling do marking_step", |
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2288 _task->worker_id()); |
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2289 } |
2174
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2290 |
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2291 // We call CMTask::do_marking_step() to completely drain the local and |
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2292 // global marking stacks. The routine is called in a loop, which we'll |
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2293 // exit if there's nothing more to do (i.e. we'completely drained the |
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2294 // entries that were pushed as a result of applying the |
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2295 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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|
2296 // lists above) or we overflow the global marking stack. |
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2297 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2298 // while there may still be some work to do. (See the comment at the |
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2299 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2300 // is reaching the specified time target.) It is only when |
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2301 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2302 // that the marking has completed. |
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|
2303 |
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2304 _task->do_marking_step(1000000000.0 /* something very large */, |
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2305 true /* do_stealing */, |
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|
2306 true /* do_termination */); |
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|
2307 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2308 } |
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|
2309 }; |
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|
2310 |
3979
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2311 // Implementation of AbstractRefProcTaskExecutor for parallel |
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|
2312 // reference processing at the end of G1 concurrent marking |
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|
2313 |
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|
2314 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2315 private: |
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|
2316 G1CollectedHeap* _g1h; |
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|
2317 ConcurrentMark* _cm; |
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|
2318 WorkGang* _workers; |
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|
2319 int _active_workers; |
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|
2320 |
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|
2321 public: |
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|
2322 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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|
2323 ConcurrentMark* cm, |
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|
2324 WorkGang* workers, |
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|
2325 int n_workers) : |
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2326 _g1h(g1h), _cm(cm), |
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2327 _workers(workers), _active_workers(n_workers) { } |
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2328 |
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2329 // Executes the given task using concurrent marking worker threads. |
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2330 virtual void execute(ProcessTask& task); |
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2331 virtual void execute(EnqueueTask& task); |
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2332 }; |
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2333 |
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2334 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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2335 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2336 ProcessTask& _proc_task; |
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2337 G1CollectedHeap* _g1h; |
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2338 ConcurrentMark* _cm; |
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2339 |
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2340 public: |
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2341 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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2342 G1CollectedHeap* g1h, |
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2343 ConcurrentMark* cm) : |
2174
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2344 AbstractGangTask("Process reference objects in parallel"), |
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2345 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
2174
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2346 |
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2347 virtual void work(uint worker_id) { |
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2348 CMTask* marking_task = _cm->task(worker_id); |
2174
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2349 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2350 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
2174
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2351 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2352 |
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2353 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
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2354 } |
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2355 }; |
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2356 |
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2357 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
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2358 assert(_workers != NULL, "Need parallel worker threads."); |
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2359 |
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2360 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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2361 |
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2362 // We need to reset the phase for each task execution so that |
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2363 // the termination protocol of CMTask::do_marking_step works. |
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2364 _cm->set_phase(_active_workers, false /* concurrent */); |
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2365 _g1h->set_par_threads(_active_workers); |
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2366 _workers->run_task(&proc_task_proxy); |
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2367 _g1h->set_par_threads(0); |
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2368 } |
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2369 |
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2370 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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2371 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2372 EnqueueTask& _enq_task; |
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2373 |
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2374 public: |
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2375 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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2376 AbstractGangTask("Enqueue reference objects in parallel"), |
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2377 _enq_task(enq_task) { } |
2174
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2378 |
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2379 virtual void work(uint worker_id) { |
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2380 _enq_task.work(worker_id); |
2174
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2381 } |
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2382 }; |
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2383 |
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2384 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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2385 assert(_workers != NULL, "Need parallel worker threads."); |
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2386 |
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2387 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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2388 |
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2389 _g1h->set_par_threads(_active_workers); |
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2390 _workers->run_task(&enq_task_proxy); |
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2391 _g1h->set_par_threads(0); |
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|
2392 } |
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|
2393 |
342 | 2394 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2395 ResourceMark rm; | |
2396 HandleMark hm; | |
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2397 |
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2398 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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2399 |
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2400 // Is alive closure. |
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2401 G1CMIsAliveClosure g1_is_alive(g1h); |
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2402 |
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2403 // Inner scope to exclude the cleaning of the string and symbol |
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|
2404 // tables from the displayed time. |
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|
2405 { |
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|
2406 if (G1Log::finer()) { |
3975
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|
2407 gclog_or_tty->put(' '); |
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|
2408 } |
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|
2409 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
3975
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2410 |
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2411 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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|
2412 |
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2413 // See the comment in G1CollectedHeap::ref_processing_init() |
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2414 // about how reference processing currently works in G1. |
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|
2415 |
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|
2416 // Process weak references. |
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|
2417 rp->setup_policy(clear_all_soft_refs); |
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|
2418 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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|
2419 |
4836
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|
2420 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
3975
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2421 G1CMDrainMarkingStackClosure |
4836
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|
2422 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
3975
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2423 |
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2424 // We use the work gang from the G1CollectedHeap and we utilize all |
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|
2425 // the worker threads. |
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2426 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
2427 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
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2428 |
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2429 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
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|
2430 g1h->workers(), active_workers); |
3975
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|
2431 |
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|
2432 if (rp->processing_is_mt()) { |
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|
2433 // Set the degree of MT here. If the discovery is done MT, there |
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|
2434 // may have been a different number of threads doing the discovery |
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|
2435 // and a different number of discovered lists may have Ref objects. |
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|
2436 // That is OK as long as the Reference lists are balanced (see |
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|
2437 // balance_all_queues() and balance_queues()). |
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|
2438 rp->set_active_mt_degree(active_workers); |
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|
2439 |
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|
2440 rp->process_discovered_references(&g1_is_alive, |
2174
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|
2441 &g1_keep_alive, |
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|
2442 &g1_drain_mark_stack, |
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|
2443 &par_task_executor); |
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|
2444 |
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2445 // The work routines of the parallel keep_alive and drain_marking_stack |
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2446 // will set the has_overflown flag if we overflow the global marking |
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|
2447 // stack. |
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|
2448 } else { |
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2449 rp->process_discovered_references(&g1_is_alive, |
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|
2450 &g1_keep_alive, |
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2451 &g1_drain_mark_stack, |
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|
2452 NULL); |
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|
2453 } |
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|
2454 |
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|
2455 assert(_markStack.overflow() || _markStack.isEmpty(), |
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|
2456 "mark stack should be empty (unless it overflowed)"); |
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|
2457 if (_markStack.overflow()) { |
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|
2458 // Should have been done already when we tried to push an |
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2459 // entry on to the global mark stack. But let's do it again. |
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2460 set_has_overflown(); |
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2461 } |
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2462 |
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2463 if (rp->processing_is_mt()) { |
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2464 assert(rp->num_q() == active_workers, "why not"); |
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2465 rp->enqueue_discovered_references(&par_task_executor); |
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2466 } else { |
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2467 rp->enqueue_discovered_references(); |
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|
2468 } |
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|
2469 |
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2470 rp->verify_no_references_recorded(); |
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2471 assert(!rp->discovery_enabled(), "Post condition"); |
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2472 } |
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2473 |
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2474 // Now clean up stale oops in StringTable |
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2475 StringTable::unlink(&g1_is_alive); |
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2476 // Clean up unreferenced symbols in symbol table. |
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2477 SymbolTable::unlink(); |
342 | 2478 } |
2479 | |
2480 void ConcurrentMark::swapMarkBitMaps() { | |
2481 CMBitMapRO* temp = _prevMarkBitMap; | |
2482 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2483 _nextMarkBitMap = (CMBitMap*) temp; | |
2484 } | |
2485 | |
2486 class CMRemarkTask: public AbstractGangTask { | |
2487 private: | |
2488 ConcurrentMark *_cm; | |
2489 | |
2490 public: | |
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2491 void work(uint worker_id) { |
342 | 2492 // Since all available tasks are actually started, we should |
2493 // only proceed if we're supposed to be actived. | |
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2494 if (worker_id < _cm->active_tasks()) { |
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2495 CMTask* task = _cm->task(worker_id); |
342 | 2496 task->record_start_time(); |
2497 do { | |
2174
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2498 task->do_marking_step(1000000000.0 /* something very large */, |
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2499 true /* do_stealing */, |
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2500 true /* do_termination */); |
342 | 2501 } while (task->has_aborted() && !_cm->has_overflown()); |
2502 // If we overflow, then we do not want to restart. We instead | |
2503 // want to abort remark and do concurrent marking again. | |
2504 task->record_end_time(); | |
2505 } | |
2506 } | |
2507 | |
4711 | 2508 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
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2509 AbstractGangTask("Par Remark"), _cm(cm) { |
4711 | 2510 _cm->terminator()->reset_for_reuse(active_workers); |
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2511 } |
342 | 2512 }; |
2513 | |
2514 void ConcurrentMark::checkpointRootsFinalWork() { | |
2515 ResourceMark rm; | |
2516 HandleMark hm; | |
2517 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2518 | |
2519 g1h->ensure_parsability(false); | |
2520 | |
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2521 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2522 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2523 // this is remark, so we'll use up all active threads |
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2524 uint active_workers = g1h->workers()->active_workers(); |
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2525 if (active_workers == 0) { |
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2526 assert(active_workers > 0, "Should have been set earlier"); |
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2527 active_workers = (uint) ParallelGCThreads; |
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2528 g1h->workers()->set_active_workers(active_workers); |
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2529 } |
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2530 set_phase(active_workers, false /* concurrent */); |
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2531 // Leave _parallel_marking_threads at it's |
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2532 // value originally calculated in the ConcurrentMark |
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2533 // constructor and pass values of the active workers |
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2534 // through the gang in the task. |
342 | 2535 |
4711 | 2536 CMRemarkTask remarkTask(this, active_workers); |
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2537 g1h->set_par_threads(active_workers); |
342 | 2538 g1h->workers()->run_task(&remarkTask); |
2539 g1h->set_par_threads(0); | |
2540 } else { | |
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2541 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2542 // this is remark, so we'll use up all available threads |
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2543 uint active_workers = 1; |
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2544 set_phase(active_workers, false /* concurrent */); |
342 | 2545 |
4711 | 2546 CMRemarkTask remarkTask(this, active_workers); |
342 | 2547 // We will start all available threads, even if we decide that the |
2548 // active_workers will be fewer. The extra ones will just bail out | |
2549 // immediately. | |
2550 remarkTask.work(0); | |
2551 } | |
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|
2552 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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|
2553 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2554 |
2555 print_stats(); | |
2556 | |
2557 #if VERIFY_OBJS_PROCESSED | |
2558 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2559 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2560 _scan_obj_cl.objs_processed, | |
2561 ThreadLocalObjQueue::objs_enqueued); | |
2562 guarantee(_scan_obj_cl.objs_processed == | |
2563 ThreadLocalObjQueue::objs_enqueued, | |
2564 "Different number of objs processed and enqueued."); | |
2565 } | |
2566 #endif | |
2567 } | |
2568 | |
1044 | 2569 #ifndef PRODUCT |
2570 | |
1388 | 2571 class PrintReachableOopClosure: public OopClosure { |
342 | 2572 private: |
2573 G1CollectedHeap* _g1h; | |
2574 outputStream* _out; | |
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2575 VerifyOption _vo; |
1388 | 2576 bool _all; |
342 | 2577 |
2578 public: | |
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|
2579 PrintReachableOopClosure(outputStream* out, |
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2580 VerifyOption vo, |
1388 | 2581 bool all) : |
1044 | 2582 _g1h(G1CollectedHeap::heap()), |
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2583 _out(out), _vo(vo), _all(all) { } |
342 | 2584 |
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|
2585 void do_oop(narrowOop* p) { do_oop_work(p); } |
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2586 void do_oop( oop* p) { do_oop_work(p); } |
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|
2587 |
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|
2588 template <class T> void do_oop_work(T* p) { |
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|
2589 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2590 const char* str = NULL; |
2591 const char* str2 = ""; | |
2592 | |
1388 | 2593 if (obj == NULL) { |
2594 str = ""; | |
2595 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2596 str = " O"; | |
2597 } else { | |
342 | 2598 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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|
2599 guarantee(hr != NULL, "invariant"); |
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|
2600 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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|
2601 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2602 |
2603 if (over_tams) { | |
1388 | 2604 str = " >"; |
2605 if (marked) { | |
342 | 2606 str2 = " AND MARKED"; |
1044 | 2607 } |
1388 | 2608 } else if (marked) { |
2609 str = " M"; | |
1044 | 2610 } else { |
1388 | 2611 str = " NOT"; |
1044 | 2612 } |
342 | 2613 } |
2614 | |
1388 | 2615 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2616 p, (void*) obj, str, str2); |
2617 } | |
2618 }; | |
2619 | |
1388 | 2620 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2621 private: |
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|
2622 G1CollectedHeap* _g1h; |
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|
2623 outputStream* _out; |
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|
2624 VerifyOption _vo; |
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|
2625 bool _all; |
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|
2626 HeapRegion* _hr; |
342 | 2627 |
2628 public: | |
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|
2629 PrintReachableObjectClosure(outputStream* out, |
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|
2630 VerifyOption vo, |
1388 | 2631 bool all, |
2632 HeapRegion* hr) : | |
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|
2633 _g1h(G1CollectedHeap::heap()), |
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|
2634 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2635 |
2636 void do_object(oop o) { | |
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2637 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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2638 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2639 bool print_it = _all || over_tams || marked; |
2640 | |
2641 if (print_it) { | |
2642 _out->print_cr(" "PTR_FORMAT"%s", | |
2643 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
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2644 PrintReachableOopClosure oopCl(_out, _vo, _all); |
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|
2645 o->oop_iterate_no_header(&oopCl); |
1388 | 2646 } |
342 | 2647 } |
2648 }; | |
2649 | |
1388 | 2650 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2651 private: |
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2652 G1CollectedHeap* _g1h; |
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2653 outputStream* _out; |
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2654 VerifyOption _vo; |
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2655 bool _all; |
342 | 2656 |
2657 public: | |
2658 bool doHeapRegion(HeapRegion* hr) { | |
2659 HeapWord* b = hr->bottom(); | |
2660 HeapWord* e = hr->end(); | |
2661 HeapWord* t = hr->top(); | |
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2662 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2663 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2664 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2665 _out->cr(); |
2666 | |
2667 HeapWord* from = b; | |
2668 HeapWord* to = t; | |
2669 | |
2670 if (to > from) { | |
2671 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2672 _out->cr(); | |
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|
2673 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2674 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2675 _out->cr(); | |
2676 } | |
342 | 2677 |
2678 return false; | |
2679 } | |
2680 | |
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2681 PrintReachableRegionClosure(outputStream* out, |
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|
2682 VerifyOption vo, |
1388 | 2683 bool all) : |
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2684 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2685 }; |
2686 | |
1388 | 2687 void ConcurrentMark::print_reachable(const char* str, |
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|
2688 VerifyOption vo, |
1388 | 2689 bool all) { |
2690 gclog_or_tty->cr(); | |
2691 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2692 |
2693 if (G1PrintReachableBaseFile == NULL) { | |
2694 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2695 return; | |
2696 } | |
2697 | |
2698 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2699 (JVM_MAXPATHLEN - 1)) { | |
2700 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2701 return; | |
2702 } | |
2703 | |
2704 char file_name[JVM_MAXPATHLEN]; | |
2705 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2706 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2707 | |
2708 fileStream fout(file_name); | |
2709 if (!fout.is_open()) { | |
2710 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2711 return; | |
2712 } | |
2713 | |
2714 outputStream* out = &fout; | |
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2715 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2716 out->cr(); |
2717 | |
1388 | 2718 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2719 out->cr(); |
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2720 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2721 _g1h->heap_region_iterate(&rcl); |
1044 | 2722 out->cr(); |
2723 | |
2724 gclog_or_tty->print_cr(" done"); | |
1388 | 2725 gclog_or_tty->flush(); |
342 | 2726 } |
2727 | |
1044 | 2728 #endif // PRODUCT |
2729 | |
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2730 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2731 // Note we are overriding the read-only view of the prev map here, via |
2732 // the cast. | |
2733 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2734 } |
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2735 |
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2736 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2737 _nextMarkBitMap->clearRange(mr); |
2738 } | |
2739 | |
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2740 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2741 clearRangePrevBitmap(mr); |
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2742 clearRangeNextBitmap(mr); |
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2743 } |
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2744 |
342 | 2745 HeapRegion* |
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2746 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2747 // "checkpoint" the finger |
2748 HeapWord* finger = _finger; | |
2749 | |
2750 // _heap_end will not change underneath our feet; it only changes at | |
2751 // yield points. | |
2752 while (finger < _heap_end) { | |
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2753 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2754 |
3771 | 2755 // Note on how this code handles humongous regions. In the |
2756 // normal case the finger will reach the start of a "starts | |
2757 // humongous" (SH) region. Its end will either be the end of the | |
2758 // last "continues humongous" (CH) region in the sequence, or the | |
2759 // standard end of the SH region (if the SH is the only region in | |
2760 // the sequence). That way claim_region() will skip over the CH | |
2761 // regions. However, there is a subtle race between a CM thread | |
2762 // executing this method and a mutator thread doing a humongous | |
2763 // object allocation. The two are not mutually exclusive as the CM | |
2764 // thread does not need to hold the Heap_lock when it gets | |
2765 // here. So there is a chance that claim_region() will come across | |
2766 // a free region that's in the progress of becoming a SH or a CH | |
2767 // region. In the former case, it will either | |
2768 // a) Miss the update to the region's end, in which case it will | |
2769 // visit every subsequent CH region, will find their bitmaps | |
2770 // empty, and do nothing, or | |
2771 // b) Will observe the update of the region's end (in which case | |
2772 // it will skip the subsequent CH regions). | |
2773 // If it comes across a region that suddenly becomes CH, the | |
2774 // scenario will be similar to b). So, the race between | |
2775 // claim_region() and a humongous object allocation might force us | |
2776 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2777 // iterations) but it should not introduce and correctness issues. | |
2778 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2779 HeapWord* bottom = curr_region->bottom(); |
2780 HeapWord* end = curr_region->end(); | |
2781 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2782 | |
3771 | 2783 if (verbose_low()) { |
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2784 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
342 | 2785 "["PTR_FORMAT", "PTR_FORMAT"), " |
2786 "limit = "PTR_FORMAT, | |
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2787 worker_id, curr_region, bottom, end, limit); |
3771 | 2788 } |
2789 | |
2790 // Is the gap between reading the finger and doing the CAS too long? | |
2791 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2792 if (res == finger) { |
2793 // we succeeded | |
2794 | |
2795 // notice that _finger == end cannot be guaranteed here since, | |
2796 // someone else might have moved the finger even further | |
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2797 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2798 |
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2799 if (verbose_low()) { |
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2800 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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2801 PTR_FORMAT, worker_id, curr_region); |
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2802 } |
342 | 2803 |
2804 if (limit > bottom) { | |
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2805 if (verbose_low()) { |
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2806 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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2807 "returning it ", worker_id, curr_region); |
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2808 } |
342 | 2809 return curr_region; |
2810 } else { | |
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2811 assert(limit == bottom, |
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2812 "the region limit should be at bottom"); |
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2813 if (verbose_low()) { |
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2814 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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2815 "returning NULL", worker_id, curr_region); |
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2816 } |
342 | 2817 // we return NULL and the caller should try calling |
2818 // claim_region() again. | |
2819 return NULL; | |
2820 } | |
2821 } else { | |
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2822 assert(_finger > finger, "the finger should have moved forward"); |
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2823 if (verbose_low()) { |
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2824 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
342 | 2825 "global finger = "PTR_FORMAT", " |
2826 "our finger = "PTR_FORMAT, | |
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2827 worker_id, _finger, finger); |
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2828 } |
342 | 2829 |
2830 // read it again | |
2831 finger = _finger; | |
2832 } | |
2833 } | |
2834 | |
2835 return NULL; | |
2836 } | |
2837 | |
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2838 #ifndef PRODUCT |
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2839 enum VerifyNoCSetOopsPhase { |
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2840 VerifyNoCSetOopsStack, |
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2841 VerifyNoCSetOopsQueues, |
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2842 VerifyNoCSetOopsSATBCompleted, |
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2843 VerifyNoCSetOopsSATBThread |
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2844 }; |
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2845 |
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2846 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2847 private: |
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2848 G1CollectedHeap* _g1h; |
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2849 VerifyNoCSetOopsPhase _phase; |
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2850 int _info; |
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2851 |
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2852 const char* phase_str() { |
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2853 switch (_phase) { |
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2854 case VerifyNoCSetOopsStack: return "Stack"; |
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2855 case VerifyNoCSetOopsQueues: return "Queue"; |
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2856 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2857 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2858 default: ShouldNotReachHere(); |
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2859 } |
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2860 return NULL; |
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|
2861 } |
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2862 |
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2863 void do_object_work(oop obj) { |
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2864 guarantee(!_g1h->obj_in_cs(obj), |
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2865 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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2866 (void*) obj, phase_str(), _info)); |
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2867 } |
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2868 |
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|
2869 public: |
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2870 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2871 |
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2872 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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2873 _phase = phase; |
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2874 _info = info; |
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|
2875 } |
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2876 |
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2877 virtual void do_oop(oop* p) { |
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2878 oop obj = oopDesc::load_decode_heap_oop(p); |
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2879 do_object_work(obj); |
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2880 } |
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2881 |
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2882 virtual void do_oop(narrowOop* p) { |
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2883 // We should not come across narrow oops while scanning marking |
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2884 // stacks and SATB buffers. |
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|
2885 ShouldNotReachHere(); |
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|
2886 } |
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2887 |
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2888 virtual void do_object(oop obj) { |
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2889 do_object_work(obj); |
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|
2890 } |
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2891 }; |
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2892 |
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2893 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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2894 bool verify_enqueued_buffers, |
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|
2895 bool verify_thread_buffers, |
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|
2896 bool verify_fingers) { |
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|
2897 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2898 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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2899 return; |
342 | 2900 } |
1835
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|
2901 |
4787
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2902 VerifyNoCSetOopsClosure cl; |
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2903 |
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2904 if (verify_stacks) { |
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|
2905 // Verify entries on the global mark stack |
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|
2906 cl.set_phase(VerifyNoCSetOopsStack); |
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2907 _markStack.oops_do(&cl); |
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2908 |
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2909 // Verify entries on the task queues |
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2910 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
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tonyp
parents:
4783
diff
changeset
|
2911 cl.set_phase(VerifyNoCSetOopsQueues, i); |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
2912 CMTaskQueue* queue = _task_queues->queue(i); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2913 queue->oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2914 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2915 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2916 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2917 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2918 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2919 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2920 if (verify_enqueued_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2921 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2922 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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|
2923 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2924 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2925 // 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
|
2926 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2927 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2928 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
|
2929 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2930 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2931 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2932 // Verify the global finger |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2933 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2934 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
|
2935 // 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
|
2936 // 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
|
2937 // 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
|
2938 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2939 // 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
|
2940 // 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
|
2941 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2942 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2943 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2944 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
|
2945 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2946 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2947 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2948 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2949 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
|
2950 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
|
2951 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2952 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2953 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
|
2954 // 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
|
2955 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
|
2956 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2957 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2958 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
|
2959 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2960 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2961 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2962 } |
342 | 2963 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2964 #endif // PRODUCT |
342 | 2965 |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2966 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
2967 _markStack.set_should_expand(); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
2968 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2969 if (clear_overflow) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2970 clear_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
|
2971 } else { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2972 assert(has_overflown(), "pre-condition"); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2973 } |
342 | 2974 _finger = _heap_start; |
2975 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2976 for (uint i = 0; i < _max_worker_id; ++i) { |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
2977 CMTaskQueue* queue = _task_queues->queue(i); |
342 | 2978 queue->set_empty(); |
2979 } | |
2980 } | |
2981 | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2984 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2985 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2986 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2987 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2989 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2992 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2993 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2994 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2995 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2996 _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
|
2997 _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
|
2998 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2999 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3000 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3001 // 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
|
3002 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3003 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3004 // "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
|
3005 // 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
|
3006 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3007 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3008 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3009 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3010 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3011 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3012 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3013 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3014 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3015 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
|
3016 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3017 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3018 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3019 start, limit, hr->top(), hr->end())); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3020 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3021 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3022 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3023 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3024 // 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
|
3025 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3026 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3027 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3028 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3029 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
|
3030 // '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
|
3031 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
|
3032 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3033 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
|
3034 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
|
3035 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
|
3036 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3037 // 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
|
3038 // 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
|
3039 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3040 // 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
|
3041 // 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
|
3042 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3043 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3044 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
|
3045 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3046 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3047 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3048 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3049 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3050 // 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
|
3051 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3052 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3053 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3054 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
|
3055 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
|
3056 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3057 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3058 // 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
|
3059 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3060 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3061 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3062 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3063 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3064 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3065 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3066 while (scan_idx < limit_idx) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3067 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3068 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3069 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3070 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3071 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3072 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3073 // parameter. It does, however, have an early exit if |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3074 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3075 // passed in for left offset here. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3076 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3077 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
changeset
|
3078 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3079 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3080 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3081 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3082 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3083 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3084 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3085 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3086 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3087 }; |
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 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3090 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3091 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3092 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3093 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3094 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3095 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3096 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3097 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3098 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3099 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3100 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3101 uint max_worker_id, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3102 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3103 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3104 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3105 _max_worker_id(max_worker_id), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3106 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3107 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3108 void work(uint worker_id) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3109 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3110 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3111 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3112 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3113 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3114 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3115 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3116 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3117 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3118 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3119 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3120 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3121 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3122 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3123 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3124 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3125 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3126 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3127 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3128 _max_worker_id, n_workers); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3129 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3130 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3131 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3132 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3133 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3134 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3135 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3136 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3137 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3138 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3139 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3140 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3141 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3142 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3143 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3144 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3145 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3146 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3147 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3148 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3149 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3150 _card_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3151 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3152 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3153 // of the final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3154 _region_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3155 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3156 uint max_regions = _g1h->max_regions(); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3157 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3158 |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3159 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
|
3160 BitMap* task_card_bm = count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3161 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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3162 |
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3163 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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3164 assert(marked_bytes_array != NULL, "uninitialized"); |
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3165 |
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3166 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
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3167 task_card_bm->clear(); |
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3168 } |
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3169 } |
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3170 |
342 | 3171 void ConcurrentMark::print_stats() { |
3172 if (verbose_stats()) { | |
3173 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3174 for (size_t i = 0; i < _active_tasks; ++i) { | |
3175 _tasks[i]->print_stats(); | |
3176 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3177 } | |
3178 } | |
3179 } | |
3180 | |
3181 // abandon current marking iteration due to a Full GC | |
3182 void ConcurrentMark::abort() { | |
3183 // Clear all marks to force marking thread to do nothing | |
3184 _nextMarkBitMap->clearAll(); | |
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3185 // Clear the liveness counting data |
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3186 clear_all_count_data(); |
342 | 3187 // Empty mark stack |
3188 clear_marking_state(); | |
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3189 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3190 _tasks[i]->clear_region_fields(); |
1835
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3191 } |
342 | 3192 _has_aborted = true; |
3193 | |
3194 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3195 satb_mq_set.abandon_partial_marking(); | |
1317
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3196 // This can be called either during or outside marking, we'll read |
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3197 // the expected_active value from the SATB queue set. |
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3198 satb_mq_set.set_active_all_threads( |
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3199 false, /* new active value */ |
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3200 satb_mq_set.is_active() /* expected_active */); |
342 | 3201 } |
3202 | |
3203 static void print_ms_time_info(const char* prefix, const char* name, | |
3204 NumberSeq& ns) { | |
3205 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3206 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3207 if (ns.num() > 0) { | |
3208 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3209 prefix, ns.sd(), ns.maximum()); | |
3210 } | |
3211 } | |
3212 | |
3213 void ConcurrentMark::print_summary_info() { | |
3214 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3215 print_ms_time_info(" ", "init marks", _init_times); | |
3216 print_ms_time_info(" ", "remarks", _remark_times); | |
3217 { | |
3218 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3219 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3220 | |
3221 } | |
3222 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3223 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3224 _total_counting_time, | |
3225 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3226 (double)_cleanup_times.num() | |
3227 : 0.0)); | |
3228 if (G1ScrubRemSets) { | |
3229 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3230 _total_rs_scrub_time, | |
3231 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3232 (double)_cleanup_times.num() | |
3233 : 0.0)); | |
3234 } | |
3235 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3236 (_init_times.sum() + _remark_times.sum() + | |
3237 _cleanup_times.sum())/1000.0); | |
3238 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3239 "(%8.2f s marking).", |
342 | 3240 cmThread()->vtime_accum(), |
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3241 cmThread()->vtime_mark_accum()); |
342 | 3242 } |
3243 | |
1019 | 3244 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
3245 _parallel_workers->print_worker_threads_on(st); | |
3246 } | |
3247 | |
342 | 3248 // We take a break if someone is trying to stop the world. |
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3249 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3250 if (should_yield()) { |
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3251 if (worker_id == 0) { |
342 | 3252 _g1h->g1_policy()->record_concurrent_pause(); |
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3253 } |
342 | 3254 cmThread()->yield(); |
3255 return true; | |
3256 } else { | |
3257 return false; | |
3258 } | |
3259 } | |
3260 | |
3261 bool ConcurrentMark::should_yield() { | |
3262 return cmThread()->should_yield(); | |
3263 } | |
3264 | |
3265 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3266 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3267 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3268 } | |
3269 | |
3270 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3271 void* last) { | |
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3272 return containing_card_is_marked(start) && |
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3273 containing_card_is_marked(last); |
342 | 3274 } |
3275 | |
3276 #ifndef PRODUCT | |
3277 // for debugging purposes | |
3278 void ConcurrentMark::print_finger() { | |
3279 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3280 _heap_start, _heap_end, _finger); | |
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3281 for (uint i = 0; i < _max_worker_id; ++i) { |
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3282 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
342 | 3283 } |
3284 gclog_or_tty->print_cr(""); | |
3285 } | |
3286 #endif | |
3287 | |
3771 | 3288 void CMTask::scan_object(oop obj) { |
3289 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3290 | |
3291 if (_cm->verbose_high()) { | |
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3292 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
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3293 _worker_id, (void*) obj); |
3771 | 3294 } |
3295 | |
3296 size_t obj_size = obj->size(); | |
3297 _words_scanned += obj_size; | |
3298 | |
3299 obj->oop_iterate(_cm_oop_closure); | |
3300 statsOnly( ++_objs_scanned ); | |
3301 check_limits(); | |
3302 } | |
3303 | |
342 | 3304 // Closure for iteration over bitmaps |
3305 class CMBitMapClosure : public BitMapClosure { | |
3306 private: | |
3307 // the bitmap that is being iterated over | |
3308 CMBitMap* _nextMarkBitMap; | |
3309 ConcurrentMark* _cm; | |
3310 CMTask* _task; | |
3311 | |
3312 public: | |
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3313 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3314 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3315 |
3316 bool do_bit(size_t offset) { | |
3317 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3318 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3319 assert( addr < _cm->finger(), "invariant"); |
342 | 3320 |
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3321 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3322 assert(addr >= _task->finger(), "invariant"); |
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3323 |
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3324 // We move that task's local finger along. |
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3325 _task->move_finger_to(addr); |
342 | 3326 |
3327 _task->scan_object(oop(addr)); | |
3328 // we only partially drain the local queue and global stack | |
3329 _task->drain_local_queue(true); | |
3330 _task->drain_global_stack(true); | |
3331 | |
3332 // if the has_aborted flag has been raised, we need to bail out of | |
3333 // the iteration | |
3334 return !_task->has_aborted(); | |
3335 } | |
3336 }; | |
3337 | |
3338 // Closure for iterating over objects, currently only used for | |
3339 // processing SATB buffers. | |
3340 class CMObjectClosure : public ObjectClosure { | |
3341 private: | |
3342 CMTask* _task; | |
3343 | |
3344 public: | |
3345 void do_object(oop obj) { | |
3346 _task->deal_with_reference(obj); | |
3347 } | |
3348 | |
3349 CMObjectClosure(CMTask* task) : _task(task) { } | |
3350 }; | |
3351 | |
3771 | 3352 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3353 ConcurrentMark* cm, | |
3354 CMTask* task) | |
3355 : _g1h(g1h), _cm(cm), _task(task) { | |
3356 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3357 | |
3358 if (G1UseConcMarkReferenceProcessing) { | |
3979
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3359 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3360 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3361 } |
3771 | 3362 } |
342 | 3363 |
3364 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3365 // Separated the asserts so that we know which one fires. |
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3366 assert(hr != NULL, |
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3367 "claim_region() should have filtered out continues humongous regions"); |
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3368 assert(!hr->continuesHumongous(), |
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3369 "claim_region() should have filtered out continues humongous regions"); |
342 | 3370 |
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3371 if (_cm->verbose_low()) { |
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3372 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3373 _worker_id, hr); |
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3374 } |
342 | 3375 |
3376 _curr_region = hr; | |
3377 _finger = hr->bottom(); | |
3378 update_region_limit(); | |
3379 } | |
3380 | |
3381 void CMTask::update_region_limit() { | |
3382 HeapRegion* hr = _curr_region; | |
3383 HeapWord* bottom = hr->bottom(); | |
3384 HeapWord* limit = hr->next_top_at_mark_start(); | |
3385 | |
3386 if (limit == bottom) { | |
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3387 if (_cm->verbose_low()) { |
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3388 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3389 "["PTR_FORMAT", "PTR_FORMAT")", |
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3390 _worker_id, bottom, limit); |
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3391 } |
342 | 3392 // The region was collected underneath our feet. |
3393 // We set the finger to bottom to ensure that the bitmap | |
3394 // iteration that will follow this will not do anything. | |
3395 // (this is not a condition that holds when we set the region up, | |
3396 // as the region is not supposed to be empty in the first place) | |
3397 _finger = bottom; | |
3398 } else if (limit >= _region_limit) { | |
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3399 assert(limit >= _finger, "peace of mind"); |
342 | 3400 } else { |
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3401 assert(limit < _region_limit, "only way to get here"); |
342 | 3402 // This can happen under some pretty unusual circumstances. An |
3403 // evacuation pause empties the region underneath our feet (NTAMS | |
3404 // at bottom). We then do some allocation in the region (NTAMS | |
3405 // stays at bottom), followed by the region being used as a GC | |
3406 // alloc region (NTAMS will move to top() and the objects | |
3407 // originally below it will be grayed). All objects now marked in | |
3408 // the region are explicitly grayed, if below the global finger, | |
3409 // and we do not need in fact to scan anything else. So, we simply | |
3410 // set _finger to be limit to ensure that the bitmap iteration | |
3411 // doesn't do anything. | |
3412 _finger = limit; | |
3413 } | |
3414 | |
3415 _region_limit = limit; | |
3416 } | |
3417 | |
3418 void CMTask::giveup_current_region() { | |
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3419 assert(_curr_region != NULL, "invariant"); |
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3420 if (_cm->verbose_low()) { |
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3421 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3422 _worker_id, _curr_region); |
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3423 } |
342 | 3424 clear_region_fields(); |
3425 } | |
3426 | |
3427 void CMTask::clear_region_fields() { | |
3428 // Values for these three fields that indicate that we're not | |
3429 // holding on to a region. | |
3430 _curr_region = NULL; | |
3431 _finger = NULL; | |
3432 _region_limit = NULL; | |
3433 } | |
3434 | |
3771 | 3435 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3436 if (cm_oop_closure == NULL) { | |
3437 assert(_cm_oop_closure != NULL, "invariant"); | |
3438 } else { | |
3439 assert(_cm_oop_closure == NULL, "invariant"); | |
3440 } | |
3441 _cm_oop_closure = cm_oop_closure; | |
3442 } | |
3443 | |
342 | 3444 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3445 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3446 |
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3447 if (_cm->verbose_low()) { |
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3448 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3449 } |
342 | 3450 |
3451 _nextMarkBitMap = nextMarkBitMap; | |
3452 clear_region_fields(); | |
3453 | |
3454 _calls = 0; | |
3455 _elapsed_time_ms = 0.0; | |
3456 _termination_time_ms = 0.0; | |
3457 _termination_start_time_ms = 0.0; | |
3458 | |
3459 #if _MARKING_STATS_ | |
3460 _local_pushes = 0; | |
3461 _local_pops = 0; | |
3462 _local_max_size = 0; | |
3463 _objs_scanned = 0; | |
3464 _global_pushes = 0; | |
3465 _global_pops = 0; | |
3466 _global_max_size = 0; | |
3467 _global_transfers_to = 0; | |
3468 _global_transfers_from = 0; | |
3469 _regions_claimed = 0; | |
3470 _objs_found_on_bitmap = 0; | |
3471 _satb_buffers_processed = 0; | |
3472 _steal_attempts = 0; | |
3473 _steals = 0; | |
3474 _aborted = 0; | |
3475 _aborted_overflow = 0; | |
3476 _aborted_cm_aborted = 0; | |
3477 _aborted_yield = 0; | |
3478 _aborted_timed_out = 0; | |
3479 _aborted_satb = 0; | |
3480 _aborted_termination = 0; | |
3481 #endif // _MARKING_STATS_ | |
3482 } | |
3483 | |
3484 bool CMTask::should_exit_termination() { | |
3485 regular_clock_call(); | |
3486 // This is called when we are in the termination protocol. We should | |
3487 // quit if, for some reason, this task wants to abort or the global | |
3488 // stack is not empty (this means that we can get work from it). | |
3489 return !_cm->mark_stack_empty() || has_aborted(); | |
3490 } | |
3491 | |
3492 void CMTask::reached_limit() { | |
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3493 assert(_words_scanned >= _words_scanned_limit || |
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3494 _refs_reached >= _refs_reached_limit , |
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3495 "shouldn't have been called otherwise"); |
342 | 3496 regular_clock_call(); |
3497 } | |
3498 | |
3499 void CMTask::regular_clock_call() { | |
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3500 if (has_aborted()) return; |
342 | 3501 |
3502 // First, we need to recalculate the words scanned and refs reached | |
3503 // limits for the next clock call. | |
3504 recalculate_limits(); | |
3505 | |
3506 // During the regular clock call we do the following | |
3507 | |
3508 // (1) If an overflow has been flagged, then we abort. | |
3509 if (_cm->has_overflown()) { | |
3510 set_has_aborted(); | |
3511 return; | |
3512 } | |
3513 | |
3514 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3515 // to check anything else. The other steps are only needed during | |
3516 // the concurrent marking phase. | |
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3517 if (!concurrent()) return; |
342 | 3518 |
3519 // (2) If marking has been aborted for Full GC, then we also abort. | |
3520 if (_cm->has_aborted()) { | |
3521 set_has_aborted(); | |
3522 statsOnly( ++_aborted_cm_aborted ); | |
3523 return; | |
3524 } | |
3525 | |
3526 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3527 | |
3528 // (3) If marking stats are enabled, then we update the step history. | |
3529 #if _MARKING_STATS_ | |
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3530 if (_words_scanned >= _words_scanned_limit) { |
342 | 3531 ++_clock_due_to_scanning; |
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3532 } |
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3533 if (_refs_reached >= _refs_reached_limit) { |
342 | 3534 ++_clock_due_to_marking; |
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3535 } |
342 | 3536 |
3537 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3538 _interval_start_time_ms = curr_time_ms; | |
3539 _all_clock_intervals_ms.add(last_interval_ms); | |
3540 | |
3541 if (_cm->verbose_medium()) { | |
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3542 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
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3543 "scanned = %d%s, refs reached = %d%s", |
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3544 _worker_id, last_interval_ms, |
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3545 _words_scanned, |
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3546 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3547 _refs_reached, |
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3548 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3549 } |
3550 #endif // _MARKING_STATS_ | |
3551 | |
3552 // (4) We check whether we should yield. If we have to, then we abort. | |
3553 if (_cm->should_yield()) { | |
3554 // We should yield. To do this we abort the task. The caller is | |
3555 // responsible for yielding. | |
3556 set_has_aborted(); | |
3557 statsOnly( ++_aborted_yield ); | |
3558 return; | |
3559 } | |
3560 | |
3561 // (5) We check whether we've reached our time quota. If we have, | |
3562 // then we abort. | |
3563 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3564 if (elapsed_time_ms > _time_target_ms) { | |
3565 set_has_aborted(); | |
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3566 _has_timed_out = true; |
342 | 3567 statsOnly( ++_aborted_timed_out ); |
3568 return; | |
3569 } | |
3570 | |
3571 // (6) Finally, we check whether there are enough completed STAB | |
3572 // buffers available for processing. If there are, we abort. | |
3573 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3574 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3776
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3575 if (_cm->verbose_low()) { |
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3576 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3577 _worker_id); |
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3578 } |
342 | 3579 // we do need to process SATB buffers, we'll abort and restart |
3580 // the marking task to do so | |
3581 set_has_aborted(); | |
3582 statsOnly( ++_aborted_satb ); | |
3583 return; | |
3584 } | |
3585 } | |
3586 | |
3587 void CMTask::recalculate_limits() { | |
3588 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3589 _words_scanned_limit = _real_words_scanned_limit; | |
3590 | |
3591 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3592 _refs_reached_limit = _real_refs_reached_limit; | |
3593 } | |
3594 | |
3595 void CMTask::decrease_limits() { | |
3596 // This is called when we believe that we're going to do an infrequent | |
3597 // operation which will increase the per byte scanned cost (i.e. move | |
3598 // entries to/from the global stack). It basically tries to decrease the | |
3599 // scanning limit so that the clock is called earlier. | |
3600 | |
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3601 if (_cm->verbose_medium()) { |
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3602 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3603 } |
342 | 3604 |
3605 _words_scanned_limit = _real_words_scanned_limit - | |
3606 3 * words_scanned_period / 4; | |
3607 _refs_reached_limit = _real_refs_reached_limit - | |
3608 3 * refs_reached_period / 4; | |
3609 } | |
3610 | |
3611 void CMTask::move_entries_to_global_stack() { | |
3612 // local array where we'll store the entries that will be popped | |
3613 // from the local queue | |
3614 oop buffer[global_stack_transfer_size]; | |
3615 | |
3616 int n = 0; | |
3617 oop obj; | |
3618 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3619 buffer[n] = obj; | |
3620 ++n; | |
3621 } | |
3622 | |
3623 if (n > 0) { | |
3624 // we popped at least one entry from the local queue | |
3625 | |
3626 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3627 | |
3628 if (!_cm->mark_stack_push(buffer, n)) { | |
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3629 if (_cm->verbose_low()) { |
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3630 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3631 _worker_id); |
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3632 } |
342 | 3633 set_has_aborted(); |
3634 } else { | |
3635 // the transfer was successful | |
3636 | |
3776
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3637 if (_cm->verbose_medium()) { |
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3638 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3639 _worker_id, n); |
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3640 } |
342 | 3641 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3642 if (tmp_size > _global_max_size) { |
342 | 3643 _global_max_size = tmp_size; |
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3644 } |
342 | 3645 _global_pushes += n ); |
3646 } | |
3647 } | |
3648 | |
3649 // this operation was quite expensive, so decrease the limits | |
3650 decrease_limits(); | |
3651 } | |
3652 | |
3653 void CMTask::get_entries_from_global_stack() { | |
3654 // local array where we'll store the entries that will be popped | |
3655 // from the global stack. | |
3656 oop buffer[global_stack_transfer_size]; | |
3657 int n; | |
3658 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3659 assert(n <= global_stack_transfer_size, |
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3660 "we should not pop more than the given limit"); |
342 | 3661 if (n > 0) { |
3662 // yes, we did actually pop at least one entry | |
3663 | |
3664 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
3776
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3665 if (_cm->verbose_medium()) { |
6862
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3666 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3667 _worker_id, n); |
3776
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3668 } |
342 | 3669 for (int i = 0; i < n; ++i) { |
3670 bool success = _task_queue->push(buffer[i]); | |
3671 // We only call this when the local queue is empty or under a | |
3672 // given target limit. So, we do not expect this push to fail. | |
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3673 assert(success, "invariant"); |
342 | 3674 } |
3675 | |
3676 statsOnly( int tmp_size = _task_queue->size(); | |
3776
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3677 if (tmp_size > _local_max_size) { |
342 | 3678 _local_max_size = tmp_size; |
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|
3679 } |
342 | 3680 _local_pushes += n ); |
3681 } | |
3682 | |
3683 // this operation was quite expensive, so decrease the limits | |
3684 decrease_limits(); | |
3685 } | |
3686 | |
3687 void CMTask::drain_local_queue(bool partially) { | |
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3688 if (has_aborted()) return; |
342 | 3689 |
3690 // Decide what the target size is, depending whether we're going to | |
3691 // drain it partially (so that other tasks can steal if they run out | |
3692 // of things to do) or totally (at the very end). | |
3693 size_t target_size; | |
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3694 if (partially) { |
342 | 3695 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
3776
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3696 } else { |
342 | 3697 target_size = 0; |
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3698 } |
342 | 3699 |
3700 if (_task_queue->size() > target_size) { | |
3776
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|
3701 if (_cm->verbose_high()) { |
6862
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3702 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
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3703 _worker_id, target_size); |
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|
3704 } |
342 | 3705 |
3706 oop obj; | |
3707 bool ret = _task_queue->pop_local(obj); | |
3708 while (ret) { | |
3709 statsOnly( ++_local_pops ); | |
3710 | |
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3711 if (_cm->verbose_high()) { |
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3712 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
342 | 3713 (void*) obj); |
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3714 } |
342 | 3715 |
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3716 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3717 assert(!_g1h->is_on_master_free_list( |
2152 | 3718 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3719 |
3720 scan_object(obj); | |
3721 | |
3776
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|
3722 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3723 ret = false; |
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|
3724 } else { |
342 | 3725 ret = _task_queue->pop_local(obj); |
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3726 } |
342 | 3727 } |
3728 | |
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|
3729 if (_cm->verbose_high()) { |
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3730 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3731 _worker_id, _task_queue->size()); |
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3732 } |
342 | 3733 } |
3734 } | |
3735 | |
3736 void CMTask::drain_global_stack(bool partially) { | |
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|
3737 if (has_aborted()) return; |
342 | 3738 |
3739 // We have a policy to drain the local queue before we attempt to | |
3740 // drain the global stack. | |
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3741 assert(partially || _task_queue->size() == 0, "invariant"); |
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). Notice that, | |
3746 // because we move entries from the global stack in chunks or | |
3747 // because another task might be doing the same, we might in fact | |
3748 // drop below the target. But, this is not a problem. | |
3749 size_t target_size; | |
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|
3750 if (partially) { |
342 | 3751 target_size = _cm->partial_mark_stack_size_target(); |
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3752 } else { |
342 | 3753 target_size = 0; |
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3754 } |
342 | 3755 |
3756 if (_cm->mark_stack_size() > target_size) { | |
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|
3757 if (_cm->verbose_low()) { |
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3758 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
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3759 _worker_id, target_size); |
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3760 } |
342 | 3761 |
3762 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3763 get_entries_from_global_stack(); | |
3764 drain_local_queue(partially); | |
3765 } | |
3766 | |
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|
3767 if (_cm->verbose_low()) { |
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|
3768 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
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|
3769 _worker_id, _cm->mark_stack_size()); |
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3770 } |
342 | 3771 } |
3772 } | |
3773 | |
3774 // SATB Queue has several assumptions on whether to call the par or | |
3775 // non-par versions of the methods. this is why some of the code is | |
3776 // replicated. We should really get rid of the single-threaded version | |
3777 // of the code to simplify things. | |
3778 void CMTask::drain_satb_buffers() { | |
3776
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3779 if (has_aborted()) return; |
342 | 3780 |
3781 // We set this so that the regular clock knows that we're in the | |
3782 // middle of draining buffers and doesn't set the abort flag when it | |
3783 // notices that SATB buffers are available for draining. It'd be | |
3784 // very counter productive if it did that. :-) | |
3785 _draining_satb_buffers = true; | |
3786 | |
3787 CMObjectClosure oc(this); | |
3788 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3776
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3789 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3790 satb_mq_set.set_par_closure(_worker_id, &oc); |
3776
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3791 } else { |
342 | 3792 satb_mq_set.set_closure(&oc); |
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3793 } |
342 | 3794 |
3795 // This keeps claiming and applying the closure to completed buffers | |
3796 // until we run out of buffers or we need to abort. | |
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3797 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3798 while (!has_aborted() && |
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3799 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
3776
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3800 if (_cm->verbose_medium()) { |
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3801 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3802 } |
342 | 3803 statsOnly( ++_satb_buffers_processed ); |
3804 regular_clock_call(); | |
3805 } | |
3806 } else { | |
3807 while (!has_aborted() && | |
3808 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3809 if (_cm->verbose_medium()) { |
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3810 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3811 } |
342 | 3812 statsOnly( ++_satb_buffers_processed ); |
3813 regular_clock_call(); | |
3814 } | |
3815 } | |
3816 | |
3817 if (!concurrent() && !has_aborted()) { | |
3818 // We should only do this during remark. | |
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3819 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3820 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
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3821 } else { |
342 | 3822 satb_mq_set.iterate_closure_all_threads(); |
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3823 } |
342 | 3824 } |
3825 | |
3826 _draining_satb_buffers = false; | |
3827 | |
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3828 assert(has_aborted() || |
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3829 concurrent() || |
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3830 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3831 |
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3832 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3833 satb_mq_set.set_par_closure(_worker_id, NULL); |
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3834 } else { |
342 | 3835 satb_mq_set.set_closure(NULL); |
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3836 } |
342 | 3837 |
3838 // again, this was a potentially expensive operation, decrease the | |
3839 // limits to get the regular clock call early | |
3840 decrease_limits(); | |
3841 } | |
3842 | |
3843 void CMTask::print_stats() { | |
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3844 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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3845 _worker_id, _calls); |
342 | 3846 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
3847 _elapsed_time_ms, _termination_time_ms); | |
3848 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3849 _step_times_ms.num(), _step_times_ms.avg(), | |
3850 _step_times_ms.sd()); | |
3851 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3852 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3853 | |
3854 #if _MARKING_STATS_ | |
3855 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3856 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3857 _all_clock_intervals_ms.sd()); | |
3858 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3859 _all_clock_intervals_ms.maximum(), | |
3860 _all_clock_intervals_ms.sum()); | |
3861 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3862 _clock_due_to_scanning, _clock_due_to_marking); | |
3863 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3864 _objs_scanned, _objs_found_on_bitmap); | |
3865 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3866 _local_pushes, _local_pops, _local_max_size); | |
3867 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3868 _global_pushes, _global_pops, _global_max_size); | |
3869 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3870 _global_transfers_to,_global_transfers_from); | |
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3871 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3872 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3873 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3874 _steal_attempts, _steals); | |
3875 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3876 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3877 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3878 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3879 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3880 #endif // _MARKING_STATS_ | |
3881 } | |
3882 | |
3883 /***************************************************************************** | |
3884 | |
3885 The do_marking_step(time_target_ms) method is the building block | |
3886 of the parallel marking framework. It can be called in parallel | |
3887 with other invocations of do_marking_step() on different tasks | |
3888 (but only one per task, obviously) and concurrently with the | |
3889 mutator threads, or during remark, hence it eliminates the need | |
3890 for two versions of the code. When called during remark, it will | |
3891 pick up from where the task left off during the concurrent marking | |
3892 phase. Interestingly, tasks are also claimable during evacuation | |
3893 pauses too, since do_marking_step() ensures that it aborts before | |
3894 it needs to yield. | |
3895 | |
3896 The data structures that is uses to do marking work are the | |
3897 following: | |
3898 | |
3899 (1) Marking Bitmap. If there are gray objects that appear only | |
3900 on the bitmap (this happens either when dealing with an overflow | |
3901 or when the initial marking phase has simply marked the roots | |
3902 and didn't push them on the stack), then tasks claim heap | |
3903 regions whose bitmap they then scan to find gray objects. A | |
3904 global finger indicates where the end of the last claimed region | |
3905 is. A local finger indicates how far into the region a task has | |
3906 scanned. The two fingers are used to determine how to gray an | |
3907 object (i.e. whether simply marking it is OK, as it will be | |
3908 visited by a task in the future, or whether it needs to be also | |
3909 pushed on a stack). | |
3910 | |
3911 (2) Local Queue. The local queue of the task which is accessed | |
3912 reasonably efficiently by the task. Other tasks can steal from | |
3913 it when they run out of work. Throughout the marking phase, a | |
3914 task attempts to keep its local queue short but not totally | |
3915 empty, so that entries are available for stealing by other | |
3916 tasks. Only when there is no more work, a task will totally | |
3917 drain its local queue. | |
3918 | |
3919 (3) Global Mark Stack. This handles local queue overflow. During | |
3920 marking only sets of entries are moved between it and the local | |
3921 queues, as access to it requires a mutex and more fine-grain | |
3922 interaction with it which might cause contention. If it | |
3923 overflows, then the marking phase should restart and iterate | |
3924 over the bitmap to identify gray objects. Throughout the marking | |
3925 phase, tasks attempt to keep the global mark stack at a small | |
3926 length but not totally empty, so that entries are available for | |
3927 popping by other tasks. Only when there is no more work, tasks | |
3928 will totally drain the global mark stack. | |
3929 | |
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3930 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 3931 made available. Buffers are regularly removed from this queue |
3932 and scanned for roots, so that the queue doesn't get too | |
3933 long. During remark, all completed buffers are processed, as | |
3934 well as the filled in parts of any uncompleted buffers. | |
3935 | |
3936 The do_marking_step() method tries to abort when the time target | |
3937 has been reached. There are a few other cases when the | |
3938 do_marking_step() method also aborts: | |
3939 | |
3940 (1) When the marking phase has been aborted (after a Full GC). | |
3941 | |
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3942 (2) When a global overflow (on the global stack) has been |
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3943 triggered. Before the task aborts, it will actually sync up with |
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3944 the other tasks to ensure that all the marking data structures |
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3945 (local queues, stacks, fingers etc.) are re-initialised so that |
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3946 when do_marking_step() completes, the marking phase can |
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3947 immediately restart. |
342 | 3948 |
3949 (3) When enough completed SATB buffers are available. The | |
3950 do_marking_step() method only tries to drain SATB buffers right | |
3951 at the beginning. So, if enough buffers are available, the | |
3952 marking step aborts and the SATB buffers are processed at | |
3953 the beginning of the next invocation. | |
3954 | |
3955 (4) To yield. when we have to yield then we abort and yield | |
3956 right at the end of do_marking_step(). This saves us from a lot | |
3957 of hassle as, by yielding we might allow a Full GC. If this | |
3958 happens then objects will be compacted underneath our feet, the | |
3959 heap might shrink, etc. We save checking for this by just | |
3960 aborting and doing the yield right at the end. | |
3961 | |
3962 From the above it follows that the do_marking_step() method should | |
3963 be called in a loop (or, otherwise, regularly) until it completes. | |
3964 | |
3965 If a marking step completes without its has_aborted() flag being | |
3966 true, it means it has completed the current marking phase (and | |
3967 also all other marking tasks have done so and have all synced up). | |
3968 | |
3969 A method called regular_clock_call() is invoked "regularly" (in | |
3970 sub ms intervals) throughout marking. It is this clock method that | |
3971 checks all the abort conditions which were mentioned above and | |
3972 decides when the task should abort. A work-based scheme is used to | |
3973 trigger this clock method: when the number of object words the | |
3974 marking phase has scanned or the number of references the marking | |
3975 phase has visited reach a given limit. Additional invocations to | |
3976 the method clock have been planted in a few other strategic places | |
3977 too. The initial reason for the clock method was to avoid calling | |
3978 vtime too regularly, as it is quite expensive. So, once it was in | |
3979 place, it was natural to piggy-back all the other conditions on it | |
3980 too and not constantly check them throughout the code. | |
3981 | |
3982 *****************************************************************************/ | |
3983 | |
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3984 void CMTask::do_marking_step(double time_target_ms, |
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3985 bool do_stealing, |
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3986 bool do_termination) { |
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3987 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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3988 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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3989 |
342 | 3990 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
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3991 assert(_task_queues != NULL, "invariant"); |
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3992 assert(_task_queue != NULL, "invariant"); |
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3993 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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3994 |
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3995 assert(!_claimed, |
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3996 "only one thread should claim this task at any one time"); |
342 | 3997 |
3998 // OK, this doesn't safeguard again all possible scenarios, as it is | |
3999 // possible for two threads to set the _claimed flag at the same | |
4000 // time. But it is only for debugging purposes anyway and it will | |
4001 // catch most problems. | |
4002 _claimed = true; | |
4003 | |
4004 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4005 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4006 | |
4007 double diff_prediction_ms = | |
4008 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4009 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4010 | |
4011 // set up the variables that are used in the work-based scheme to | |
4012 // call the regular clock method | |
4013 _words_scanned = 0; | |
4014 _refs_reached = 0; | |
4015 recalculate_limits(); | |
4016 | |
4017 // clear all flags | |
4018 clear_has_aborted(); | |
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4019 _has_timed_out = false; |
342 | 4020 _draining_satb_buffers = false; |
4021 | |
4022 ++_calls; | |
4023 | |
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4024 if (_cm->verbose_low()) { |
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4025 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4026 "target = %1.2lfms >>>>>>>>>>", |
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4027 _worker_id, _calls, _time_target_ms); |
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4028 } |
342 | 4029 |
4030 // Set up the bitmap and oop closures. Anything that uses them is | |
4031 // eventually called from this method, so it is OK to allocate these | |
4032 // statically. | |
4033 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4034 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4035 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4036 |
4037 if (_cm->has_overflown()) { | |
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4038 // This can happen if the mark stack overflows during a GC pause |
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4039 // and this task, after a yield point, restarts. We have to abort |
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4040 // as we need to get into the overflow protocol which happens |
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4041 // right at the end of this task. |
342 | 4042 set_has_aborted(); |
4043 } | |
4044 | |
4045 // First drain any available SATB buffers. After this, we will not | |
4046 // look at SATB buffers before the next invocation of this method. | |
4047 // If enough completed SATB buffers are queued up, the regular clock | |
4048 // will abort this task so that it restarts. | |
4049 drain_satb_buffers(); | |
4050 // ...then partially drain the local queue and the global stack | |
4051 drain_local_queue(true); | |
4052 drain_global_stack(true); | |
4053 | |
4054 do { | |
4055 if (!has_aborted() && _curr_region != NULL) { | |
4056 // This means that we're already holding on to a region. | |
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4057 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4058 "should not be NULL either"); |
342 | 4059 |
4060 // We might have restarted this task after an evacuation pause | |
4061 // which might have evacuated the region we're holding on to | |
4062 // underneath our feet. Let's read its limit again to make sure | |
4063 // that we do not iterate over a region of the heap that | |
4064 // contains garbage (update_region_limit() will also move | |
4065 // _finger to the start of the region if it is found empty). | |
4066 update_region_limit(); | |
4067 // We will start from _finger not from the start of the region, | |
4068 // as we might be restarting this task after aborting half-way | |
4069 // through scanning this region. In this case, _finger points to | |
4070 // the address where we last found a marked object. If this is a | |
4071 // fresh region, _finger points to start(). | |
4072 MemRegion mr = MemRegion(_finger, _region_limit); | |
4073 | |
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4074 if (_cm->verbose_low()) { |
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4075 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4076 "["PTR_FORMAT", "PTR_FORMAT") " |
4077 "of region "PTR_FORMAT, | |
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4078 _worker_id, _finger, _region_limit, _curr_region); |
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4079 } |
342 | 4080 |
4081 // Let's iterate over the bitmap of the part of the | |
4082 // region that is left. | |
5988
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4083 if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4084 // We successfully completed iterating over the region. Now, |
4085 // let's give up the region. | |
4086 giveup_current_region(); | |
4087 regular_clock_call(); | |
4088 } else { | |
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4089 assert(has_aborted(), "currently the only way to do so"); |
342 | 4090 // The only way to abort the bitmap iteration is to return |
4091 // false from the do_bit() method. However, inside the | |
4092 // do_bit() method we move the _finger to point to the | |
4093 // object currently being looked at. So, if we bail out, we | |
4094 // have definitely set _finger to something non-null. | |
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4095 assert(_finger != NULL, "invariant"); |
342 | 4096 |
4097 // Region iteration was actually aborted. So now _finger | |
4098 // points to the address of the object we last scanned. If we | |
4099 // leave it there, when we restart this task, we will rescan | |
4100 // the object. It is easy to avoid this. We move the finger by | |
4101 // enough to point to the next possible object header (the | |
4102 // bitmap knows by how much we need to move it as it knows its | |
4103 // granularity). | |
1314
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4104 assert(_finger < _region_limit, "invariant"); |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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4105 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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4106 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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4107 if (new_finger >= _region_limit) { |
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4108 giveup_current_region(); |
1314
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4109 } else { |
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4110 move_finger_to(new_finger); |
1314
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4111 } |
342 | 4112 } |
4113 } | |
4114 // At this point we have either completed iterating over the | |
4115 // region we were holding on to, or we have aborted. | |
4116 | |
4117 // We then partially drain the local queue and the global stack. | |
4118 // (Do we really need this?) | |
4119 drain_local_queue(true); | |
4120 drain_global_stack(true); | |
4121 | |
4122 // Read the note on the claim_region() method on why it might | |
4123 // return NULL with potentially more regions available for | |
4124 // claiming and why we have to check out_of_regions() to determine | |
4125 // whether we're done or not. | |
4126 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4127 // We are going to try to claim a new region. We should have | |
4128 // given up on the previous one. | |
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4129 // Separated the asserts so that we know which one fires. |
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4130 assert(_curr_region == NULL, "invariant"); |
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4131 assert(_finger == NULL, "invariant"); |
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4132 assert(_region_limit == NULL, "invariant"); |
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4133 if (_cm->verbose_low()) { |
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4134 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
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4135 } |
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4136 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4137 if (claimed_region != NULL) { |
4138 // Yes, we managed to claim one | |
4139 statsOnly( ++_regions_claimed ); | |
4140 | |
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4141 if (_cm->verbose_low()) { |
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4142 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4143 "region "PTR_FORMAT, |
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4144 _worker_id, claimed_region); |
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4145 } |
342 | 4146 |
4147 setup_for_region(claimed_region); | |
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4148 assert(_curr_region == claimed_region, "invariant"); |
342 | 4149 } |
4150 // It is important to call the regular clock here. It might take | |
4151 // a while to claim a region if, for example, we hit a large | |
4152 // block of empty regions. So we need to call the regular clock | |
4153 // method once round the loop to make sure it's called | |
4154 // frequently enough. | |
4155 regular_clock_call(); | |
4156 } | |
4157 | |
4158 if (!has_aborted() && _curr_region == NULL) { | |
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4159 assert(_cm->out_of_regions(), |
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4160 "at this point we should be out of regions"); |
342 | 4161 } |
4162 } while ( _curr_region != NULL && !has_aborted()); | |
4163 | |
4164 if (!has_aborted()) { | |
4165 // We cannot check whether the global stack is empty, since other | |
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4166 // tasks might be pushing objects to it concurrently. |
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4167 assert(_cm->out_of_regions(), |
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4168 "at this point we should be out of regions"); |
342 | 4169 |
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4170 if (_cm->verbose_low()) { |
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4171 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
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4172 } |
342 | 4173 |
4174 // Try to reduce the number of available SATB buffers so that | |
4175 // remark has less work to do. | |
4176 drain_satb_buffers(); | |
4177 } | |
4178 | |
4179 // Since we've done everything else, we can now totally drain the | |
4180 // local queue and global stack. | |
4181 drain_local_queue(false); | |
4182 drain_global_stack(false); | |
4183 | |
4184 // Attempt at work stealing from other task's queues. | |
2174
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4185 if (do_stealing && !has_aborted()) { |
342 | 4186 // We have not aborted. This means that we have finished all that |
4187 // we could. Let's try to do some stealing... | |
4188 | |
4189 // We cannot check whether the global stack is empty, since other | |
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4190 // tasks might be pushing objects to it concurrently. |
1023
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4191 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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4192 "only way to reach here"); |
342 | 4193 |
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4194 if (_cm->verbose_low()) { |
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4195 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
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4196 } |
342 | 4197 |
4198 while (!has_aborted()) { | |
4199 oop obj; | |
4200 statsOnly( ++_steal_attempts ); | |
4201 | |
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4202 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
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4203 if (_cm->verbose_medium()) { |
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4204 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
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4205 _worker_id, (void*) obj); |
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4206 } |
342 | 4207 |
4208 statsOnly( ++_steals ); | |
4209 | |
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4210 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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|
4211 "any stolen object should be marked"); |
342 | 4212 scan_object(obj); |
4213 | |
4214 // And since we're towards the end, let's totally drain the | |
4215 // local queue and global stack. | |
4216 drain_local_queue(false); | |
4217 drain_global_stack(false); | |
4218 } else { | |
4219 break; | |
4220 } | |
4221 } | |
4222 } | |
4223 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4224 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4225 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4226 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
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|
4227 if (_cm->force_overflow()->should_force()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4228 _cm->set_has_overflown(); |
cd8e33b2a8ad
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|
4229 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4230 } |
cd8e33b2a8ad
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|
4231 } |
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4232 |
342 | 4233 // We still haven't aborted. Now, let's try to get into the |
4234 // termination protocol. | |
2174
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4235 if (do_termination && !has_aborted()) { |
342 | 4236 // We cannot check whether the global stack is empty, since other |
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4237 // tasks might be concurrently pushing objects on it. |
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4238 // Separated the asserts so that we know which one fires. |
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4239 assert(_cm->out_of_regions(), "only way to reach here"); |
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4240 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4241 |
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4242 if (_cm->verbose_low()) { |
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4243 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
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4244 } |
342 | 4245 |
4246 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4247 // The CMTask class also extends the TerminatorTerminator class, | |
4248 // hence its should_exit_termination() method will also decide | |
4249 // whether to exit the termination protocol or not. | |
4250 bool finished = _cm->terminator()->offer_termination(this); | |
4251 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4252 _termination_time_ms += | |
4253 termination_end_time_ms - _termination_start_time_ms; | |
4254 | |
4255 if (finished) { | |
4256 // We're all done. | |
4257 | |
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4258 if (_worker_id == 0) { |
342 | 4259 // let's allow task 0 to do this |
4260 if (concurrent()) { | |
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|
4261 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4262 // we need to set this to false before the next |
4263 // safepoint. This way we ensure that the marking phase | |
4264 // doesn't observe any more heap expansions. | |
4265 _cm->clear_concurrent_marking_in_progress(); | |
4266 } | |
4267 } | |
4268 | |
4269 // We can now guarantee that the global stack is empty, since | |
1023
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|
4270 // all other tasks have finished. We separated the guarantees so |
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4271 // that, if a condition is false, we can immediately find out |
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|
4272 // which one. |
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|
4273 guarantee(_cm->out_of_regions(), "only way to reach here"); |
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|
4274 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
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|
4275 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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|
4276 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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|
4277 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4278 |
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|
4279 if (_cm->verbose_low()) { |
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4280 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
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|
4281 } |
342 | 4282 } else { |
4283 // Apparently there's more work to do. Let's abort this task. It | |
4284 // will restart it and we can hopefully find more things to do. | |
4285 | |
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|
4286 if (_cm->verbose_low()) { |
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|
4287 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
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|
4288 _worker_id); |
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|
4289 } |
342 | 4290 |
4291 set_has_aborted(); | |
4292 statsOnly( ++_aborted_termination ); | |
4293 } | |
4294 } | |
4295 | |
4296 // Mainly for debugging purposes to make sure that a pointer to the | |
4297 // closure which was statically allocated in this frame doesn't | |
4298 // escape it by accident. | |
3771 | 4299 set_cm_oop_closure(NULL); |
342 | 4300 double end_time_ms = os::elapsedVTime() * 1000.0; |
4301 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4302 // Update the step history. | |
4303 _step_times_ms.add(elapsed_time_ms); | |
4304 | |
4305 if (has_aborted()) { | |
4306 // The task was aborted for some reason. | |
4307 | |
4308 statsOnly( ++_aborted ); | |
4309 | |
2174
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|
4310 if (_has_timed_out) { |
342 | 4311 double diff_ms = elapsed_time_ms - _time_target_ms; |
4312 // Keep statistics of how well we did with respect to hitting | |
4313 // our target only if we actually timed out (if we aborted for | |
4314 // other reasons, then the results might get skewed). | |
4315 _marking_step_diffs_ms.add(diff_ms); | |
4316 } | |
4317 | |
4318 if (_cm->has_overflown()) { | |
4319 // This is the interesting one. We aborted because a global | |
4320 // overflow was raised. This means we have to restart the | |
4321 // marking phase and start iterating over regions. However, in | |
4322 // order to do this we have to make sure that all tasks stop | |
4323 // what they are doing and re-initialise in a safe manner. We | |
4324 // will achieve this with the use of two barrier sync points. | |
4325 | |
3776
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|
4326 if (_cm->verbose_low()) { |
6862
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|
4327 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
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|
4328 } |
342 | 4329 |
6862
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|
4330 _cm->enter_first_sync_barrier(_worker_id); |
342 | 4331 // When we exit this sync barrier we know that all tasks have |
4332 // stopped doing marking work. So, it's now safe to | |
4333 // re-initialise our data structures. At the end of this method, | |
4334 // task 0 will clear the global data structures. | |
4335 | |
4336 statsOnly( ++_aborted_overflow ); | |
4337 | |
4338 // We clear the local state of this task... | |
4339 clear_region_fields(); | |
4340 | |
4341 // ...and enter the second barrier. | |
6862
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|
4342 _cm->enter_second_sync_barrier(_worker_id); |
342 | 4343 // At this point everything has bee re-initialised and we're |
4344 // ready to restart. | |
4345 } | |
4346 | |
4347 if (_cm->verbose_low()) { | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4348 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4349 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
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|
4350 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
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|
4351 if (_cm->has_aborted()) { |
6862
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|
4352 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4353 _worker_id); |
3776
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|
4354 } |
342 | 4355 } |
4356 } else { | |
3776
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|
4357 if (_cm->verbose_low()) { |
6862
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|
4358 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4359 "elapsed = %1.2lfms <<<<<<<<<<", |
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|
4360 _worker_id, _time_target_ms, elapsed_time_ms); |
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|
4361 } |
342 | 4362 } |
4363 | |
4364 _claimed = false; | |
4365 } | |
4366 | |
6862
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|
4367 CMTask::CMTask(uint worker_id, |
342 | 4368 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
4369 size_t* marked_bytes, |
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|
4370 BitMap* card_bm, |
342 | 4371 CMTaskQueue* task_queue, |
4372 CMTaskQueueSet* task_queues) | |
4373 : _g1h(G1CollectedHeap::heap()), | |
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|
4374 _worker_id(worker_id), _cm(cm), |
342 | 4375 _claimed(false), |
4376 _nextMarkBitMap(NULL), _hash_seed(17), | |
4377 _task_queue(task_queue), | |
4378 _task_queues(task_queues), | |
3771 | 4379 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
4380 _marked_bytes_array(marked_bytes), |
d30fa85f9994
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|
4381 _card_bm(card_bm) { |
1023
11d4857fe5e1
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tonyp
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1022
diff
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|
4382 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
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|
4383 guarantee(task_queues != NULL, "invariant"); |
342 | 4384 |
4385 statsOnly( _clock_due_to_scanning = 0; | |
4386 _clock_due_to_marking = 0 ); | |
4387 | |
4388 _marking_step_diffs_ms.add(0.5); | |
4389 } | |
2435
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|
4390 |
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|
4391 // These are formatting macros that are used below to ensure |
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|
4392 // consistent formatting. The *_H_* versions are used to format the |
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|
4393 // header for a particular value and they should be kept consistent |
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|
4394 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4395 // the necessary white space (as a prefix) which makes them a bit |
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|
4396 // easier to compose. |
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|
4397 |
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|
4398 // All the output lines are prefixed with this string to be able to |
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|
4399 // identify them easily in a large log file. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4400 #define G1PPRL_LINE_PREFIX "###" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4401 |
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|
4402 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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|
4403 #ifdef _LP64 |
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|
4404 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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|
4405 #else // _LP64 |
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|
4406 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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|
4407 #endif // _LP64 |
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|
4408 |
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|
4409 // For per-region info |
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|
4410 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
4411 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
4412 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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|
4413 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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|
4414 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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|
4415 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4416 |
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|
4417 // For summary info |
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|
4418 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4419 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4420 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4421 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
371bbc844bf1
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|
4422 |
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|
4423 G1PrintRegionLivenessInfoClosure:: |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4424 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4425 : _out(out), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4426 _total_used_bytes(0), _total_capacity_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4427 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4428 _hum_used_bytes(0), _hum_capacity_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4429 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4430 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
371bbc844bf1
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|
4431 MemRegion g1_committed = g1h->g1_committed(); |
371bbc844bf1
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|
4432 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4433 double now = os::elapsedTime(); |
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|
4434 |
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|
4435 // Print the header of the output. |
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|
4436 _out->cr(); |
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|
4437 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4438 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4439 G1PPRL_SUM_ADDR_FORMAT("committed") |
371bbc844bf1
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|
4440 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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|
4441 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
371bbc844bf1
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|
4442 g1_committed.start(), g1_committed.end(), |
371bbc844bf1
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changeset
|
4443 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4444 HeapRegion::GrainBytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4445 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4446 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4447 G1PPRL_TYPE_H_FORMAT |
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|
4448 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4449 G1PPRL_BYTE_H_FORMAT |
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|
4450 G1PPRL_BYTE_H_FORMAT |
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|
4451 G1PPRL_BYTE_H_FORMAT |
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|
4452 G1PPRL_DOUBLE_H_FORMAT, |
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|
4453 "type", "address-range", |
371bbc844bf1
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changeset
|
4454 "used", "prev-live", "next-live", "gc-eff"); |
3977
5cc33133bc6d
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|
4455 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4456 G1PPRL_TYPE_H_FORMAT |
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changeset
|
4457 G1PPRL_ADDR_BASE_H_FORMAT |
5cc33133bc6d
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|
4458 G1PPRL_BYTE_H_FORMAT |
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changeset
|
4459 G1PPRL_BYTE_H_FORMAT |
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|
4460 G1PPRL_BYTE_H_FORMAT |
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changeset
|
4461 G1PPRL_DOUBLE_H_FORMAT, |
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diff
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|
4462 "", "", |
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diff
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|
4463 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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|
4464 } |
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changeset
|
4465 |
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|
4466 // It takes as a parameter a reference to one of the _hum_* fields, it |
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|
4467 // deduces the corresponding value for a region in a humongous region |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4468 // series (either the region size, or what's left if the _hum_* field |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4469 // is < the region size), and updates the _hum_* field accordingly. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4470 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4471 size_t bytes = 0; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4472 // The > 0 check is to deal with the prev and next live bytes which |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4473 // could be 0. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4474 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4475 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4476 *hum_bytes -= bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4477 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4478 return bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4479 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4480 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4481 // It deduces the values for a region in a humongous region series |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4482 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4483 // that that _hum_* fields have already been set up from the "starts |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4484 // humongous" region and we visit the regions in address order. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4485 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4486 size_t* capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4487 size_t* prev_live_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4488 size_t* next_live_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4489 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4490 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4491 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4492 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4493 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4494 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4495 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4496 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4497 const char* type = ""; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4498 HeapWord* bottom = r->bottom(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4499 HeapWord* end = r->end(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4500 size_t capacity_bytes = r->capacity(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4501 size_t used_bytes = r->used(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4502 size_t prev_live_bytes = r->live_bytes(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4503 size_t next_live_bytes = r->next_live_bytes(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4504 double gc_eff = r->gc_efficiency(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4505 if (r->used() == 0) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4506 type = "FREE"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4507 } else if (r->is_survivor()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4508 type = "SURV"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4509 } else if (r->is_young()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4510 type = "EDEN"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4511 } else if (r->startsHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4512 type = "HUMS"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4513 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4514 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4515 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4516 "they should have been zeroed after the last time we used them"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4517 // Set up the _hum_* fields. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4518 _hum_capacity_bytes = capacity_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4519 _hum_used_bytes = used_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4520 _hum_prev_live_bytes = prev_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4521 _hum_next_live_bytes = next_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4522 get_hum_bytes(&used_bytes, &capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4523 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4524 end = bottom + HeapRegion::GrainWords; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4525 } else if (r->continuesHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4526 type = "HUMC"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4527 get_hum_bytes(&used_bytes, &capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4528 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4529 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4530 } else { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4531 type = "OLD"; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4532 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4533 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4534 _total_used_bytes += used_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4535 _total_capacity_bytes += capacity_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4536 _total_prev_live_bytes += prev_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4537 _total_next_live_bytes += next_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4538 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4539 // Print a line for this particular region. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4540 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4541 G1PPRL_TYPE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4542 G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4543 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4544 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4545 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4546 G1PPRL_DOUBLE_FORMAT, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4547 type, bottom, end, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4548 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4549 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4550 return false; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4551 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4552 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4553 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4554 // Print the footer of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4555 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4556 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4557 " SUMMARY" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4558 G1PPRL_SUM_MB_FORMAT("capacity") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4559 G1PPRL_SUM_MB_PERC_FORMAT("used") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4560 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4561 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4562 bytes_to_mb(_total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4563 bytes_to_mb(_total_used_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4564 perc(_total_used_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4565 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4566 perc(_total_prev_live_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4567 bytes_to_mb(_total_next_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4568 perc(_total_next_live_bytes, _total_capacity_bytes)); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4569 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4570 } |