Thu, 03 Jan 2013 16:28:22 -0800
8004816: G1: Kitchensink failures after marking stack changes
Summary: Reset the marking state, including the mark stack overflow flag, in the event of a marking stack overflow during serial reference processing.
Reviewed-by: jmasa
ysr@777 | 1 | /* |
johnc@4386 | 2 | * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "classfile/symbolTable.hpp" |
tonyp@2968 | 27 | #include "gc_implementation/g1/concurrentMark.inline.hpp" |
stefank@2314 | 28 | #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
stefank@2314 | 29 | #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
stefank@2314 | 30 | #include "gc_implementation/g1/g1CollectorPolicy.hpp" |
tonyp@3114 | 31 | #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
brutisso@3710 | 32 | #include "gc_implementation/g1/g1Log.hpp" |
tonyp@2968 | 33 | #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
stefank@2314 | 34 | #include "gc_implementation/g1/g1RemSet.hpp" |
tonyp@3416 | 35 | #include "gc_implementation/g1/heapRegion.inline.hpp" |
stefank@2314 | 36 | #include "gc_implementation/g1/heapRegionRemSet.hpp" |
stefank@2314 | 37 | #include "gc_implementation/g1/heapRegionSeq.inline.hpp" |
kamg@2445 | 38 | #include "gc_implementation/shared/vmGCOperations.hpp" |
stefank@2314 | 39 | #include "memory/genOopClosures.inline.hpp" |
stefank@2314 | 40 | #include "memory/referencePolicy.hpp" |
stefank@2314 | 41 | #include "memory/resourceArea.hpp" |
stefank@2314 | 42 | #include "oops/oop.inline.hpp" |
stefank@2314 | 43 | #include "runtime/handles.inline.hpp" |
stefank@2314 | 44 | #include "runtime/java.hpp" |
zgu@3900 | 45 | #include "services/memTracker.hpp" |
ysr@777 | 46 | |
brutisso@3455 | 47 | // Concurrent marking bit map wrapper |
ysr@777 | 48 | |
johnc@4333 | 49 | CMBitMapRO::CMBitMapRO(int shifter) : |
johnc@4333 | 50 | _bm(), |
ysr@777 | 51 | _shifter(shifter) { |
johnc@4333 | 52 | _bmStartWord = 0; |
johnc@4333 | 53 | _bmWordSize = 0; |
ysr@777 | 54 | } |
ysr@777 | 55 | |
ysr@777 | 56 | HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, |
ysr@777 | 57 | HeapWord* limit) const { |
ysr@777 | 58 | // First we must round addr *up* to a possible object boundary. |
ysr@777 | 59 | addr = (HeapWord*)align_size_up((intptr_t)addr, |
ysr@777 | 60 | HeapWordSize << _shifter); |
ysr@777 | 61 | size_t addrOffset = heapWordToOffset(addr); |
tonyp@2973 | 62 | if (limit == NULL) { |
tonyp@2973 | 63 | limit = _bmStartWord + _bmWordSize; |
tonyp@2973 | 64 | } |
ysr@777 | 65 | size_t limitOffset = heapWordToOffset(limit); |
ysr@777 | 66 | size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); |
ysr@777 | 67 | HeapWord* nextAddr = offsetToHeapWord(nextOffset); |
ysr@777 | 68 | assert(nextAddr >= addr, "get_next_one postcondition"); |
ysr@777 | 69 | assert(nextAddr == limit || isMarked(nextAddr), |
ysr@777 | 70 | "get_next_one postcondition"); |
ysr@777 | 71 | return nextAddr; |
ysr@777 | 72 | } |
ysr@777 | 73 | |
ysr@777 | 74 | HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, |
ysr@777 | 75 | HeapWord* limit) const { |
ysr@777 | 76 | size_t addrOffset = heapWordToOffset(addr); |
tonyp@2973 | 77 | if (limit == NULL) { |
tonyp@2973 | 78 | limit = _bmStartWord + _bmWordSize; |
tonyp@2973 | 79 | } |
ysr@777 | 80 | size_t limitOffset = heapWordToOffset(limit); |
ysr@777 | 81 | size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); |
ysr@777 | 82 | HeapWord* nextAddr = offsetToHeapWord(nextOffset); |
ysr@777 | 83 | assert(nextAddr >= addr, "get_next_one postcondition"); |
ysr@777 | 84 | assert(nextAddr == limit || !isMarked(nextAddr), |
ysr@777 | 85 | "get_next_one postcondition"); |
ysr@777 | 86 | return nextAddr; |
ysr@777 | 87 | } |
ysr@777 | 88 | |
ysr@777 | 89 | int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { |
ysr@777 | 90 | assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); |
ysr@777 | 91 | return (int) (diff >> _shifter); |
ysr@777 | 92 | } |
ysr@777 | 93 | |
ysr@777 | 94 | #ifndef PRODUCT |
johnc@4333 | 95 | bool CMBitMapRO::covers(ReservedSpace heap_rs) const { |
ysr@777 | 96 | // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
brutisso@4061 | 97 | assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
ysr@777 | 98 | "size inconsistency"); |
johnc@4333 | 99 | return _bmStartWord == (HeapWord*)(heap_rs.base()) && |
johnc@4333 | 100 | _bmWordSize == heap_rs.size()>>LogHeapWordSize; |
ysr@777 | 101 | } |
ysr@777 | 102 | #endif |
ysr@777 | 103 | |
johnc@4333 | 104 | bool CMBitMap::allocate(ReservedSpace heap_rs) { |
johnc@4333 | 105 | _bmStartWord = (HeapWord*)(heap_rs.base()); |
johnc@4333 | 106 | _bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes |
johnc@4333 | 107 | ReservedSpace brs(ReservedSpace::allocation_align_size_up( |
johnc@4333 | 108 | (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); |
johnc@4333 | 109 | if (!brs.is_reserved()) { |
johnc@4333 | 110 | warning("ConcurrentMark marking bit map allocation failure"); |
johnc@4333 | 111 | return false; |
johnc@4333 | 112 | } |
johnc@4333 | 113 | MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
johnc@4333 | 114 | // For now we'll just commit all of the bit map up front. |
johnc@4333 | 115 | // Later on we'll try to be more parsimonious with swap. |
johnc@4333 | 116 | if (!_virtual_space.initialize(brs, brs.size())) { |
johnc@4333 | 117 | warning("ConcurrentMark marking bit map backing store failure"); |
johnc@4333 | 118 | return false; |
johnc@4333 | 119 | } |
johnc@4333 | 120 | assert(_virtual_space.committed_size() == brs.size(), |
johnc@4333 | 121 | "didn't reserve backing store for all of concurrent marking bit map?"); |
johnc@4333 | 122 | _bm.set_map((uintptr_t*)_virtual_space.low()); |
johnc@4333 | 123 | assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= |
johnc@4333 | 124 | _bmWordSize, "inconsistency in bit map sizing"); |
johnc@4333 | 125 | _bm.set_size(_bmWordSize >> _shifter); |
johnc@4333 | 126 | return true; |
johnc@4333 | 127 | } |
johnc@4333 | 128 | |
ysr@777 | 129 | void CMBitMap::clearAll() { |
ysr@777 | 130 | _bm.clear(); |
ysr@777 | 131 | return; |
ysr@777 | 132 | } |
ysr@777 | 133 | |
ysr@777 | 134 | void CMBitMap::markRange(MemRegion mr) { |
ysr@777 | 135 | mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); |
ysr@777 | 136 | assert(!mr.is_empty(), "unexpected empty region"); |
ysr@777 | 137 | assert((offsetToHeapWord(heapWordToOffset(mr.end())) == |
ysr@777 | 138 | ((HeapWord *) mr.end())), |
ysr@777 | 139 | "markRange memory region end is not card aligned"); |
ysr@777 | 140 | // convert address range into offset range |
ysr@777 | 141 | _bm.at_put_range(heapWordToOffset(mr.start()), |
ysr@777 | 142 | heapWordToOffset(mr.end()), true); |
ysr@777 | 143 | } |
ysr@777 | 144 | |
ysr@777 | 145 | void CMBitMap::clearRange(MemRegion mr) { |
ysr@777 | 146 | mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); |
ysr@777 | 147 | assert(!mr.is_empty(), "unexpected empty region"); |
ysr@777 | 148 | // convert address range into offset range |
ysr@777 | 149 | _bm.at_put_range(heapWordToOffset(mr.start()), |
ysr@777 | 150 | heapWordToOffset(mr.end()), false); |
ysr@777 | 151 | } |
ysr@777 | 152 | |
ysr@777 | 153 | MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, |
ysr@777 | 154 | HeapWord* end_addr) { |
ysr@777 | 155 | HeapWord* start = getNextMarkedWordAddress(addr); |
ysr@777 | 156 | start = MIN2(start, end_addr); |
ysr@777 | 157 | HeapWord* end = getNextUnmarkedWordAddress(start); |
ysr@777 | 158 | end = MIN2(end, end_addr); |
ysr@777 | 159 | assert(start <= end, "Consistency check"); |
ysr@777 | 160 | MemRegion mr(start, end); |
ysr@777 | 161 | if (!mr.is_empty()) { |
ysr@777 | 162 | clearRange(mr); |
ysr@777 | 163 | } |
ysr@777 | 164 | return mr; |
ysr@777 | 165 | } |
ysr@777 | 166 | |
ysr@777 | 167 | CMMarkStack::CMMarkStack(ConcurrentMark* cm) : |
ysr@777 | 168 | _base(NULL), _cm(cm) |
ysr@777 | 169 | #ifdef ASSERT |
ysr@777 | 170 | , _drain_in_progress(false) |
ysr@777 | 171 | , _drain_in_progress_yields(false) |
ysr@777 | 172 | #endif |
ysr@777 | 173 | {} |
ysr@777 | 174 | |
johnc@4333 | 175 | bool CMMarkStack::allocate(size_t capacity) { |
johnc@4333 | 176 | // allocate a stack of the requisite depth |
johnc@4333 | 177 | ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
johnc@4333 | 178 | if (!rs.is_reserved()) { |
johnc@4333 | 179 | warning("ConcurrentMark MarkStack allocation failure"); |
johnc@4333 | 180 | return false; |
tonyp@2973 | 181 | } |
johnc@4333 | 182 | MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
johnc@4333 | 183 | if (!_virtual_space.initialize(rs, rs.size())) { |
johnc@4333 | 184 | warning("ConcurrentMark MarkStack backing store failure"); |
johnc@4333 | 185 | // Release the virtual memory reserved for the marking stack |
johnc@4333 | 186 | rs.release(); |
johnc@4333 | 187 | return false; |
johnc@4333 | 188 | } |
johnc@4333 | 189 | assert(_virtual_space.committed_size() == rs.size(), |
johnc@4333 | 190 | "Didn't reserve backing store for all of ConcurrentMark stack?"); |
johnc@4333 | 191 | _base = (oop*) _virtual_space.low(); |
johnc@4333 | 192 | setEmpty(); |
johnc@4333 | 193 | _capacity = (jint) capacity; |
tonyp@3416 | 194 | _saved_index = -1; |
johnc@4386 | 195 | _should_expand = false; |
ysr@777 | 196 | NOT_PRODUCT(_max_depth = 0); |
johnc@4333 | 197 | return true; |
johnc@4333 | 198 | } |
johnc@4333 | 199 | |
johnc@4333 | 200 | void CMMarkStack::expand() { |
johnc@4333 | 201 | // Called, during remark, if we've overflown the marking stack during marking. |
johnc@4333 | 202 | assert(isEmpty(), "stack should been emptied while handling overflow"); |
johnc@4333 | 203 | assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
johnc@4333 | 204 | // Clear expansion flag |
johnc@4333 | 205 | _should_expand = false; |
johnc@4333 | 206 | if (_capacity == (jint) MarkStackSizeMax) { |
johnc@4333 | 207 | if (PrintGCDetails && Verbose) { |
johnc@4333 | 208 | gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
johnc@4333 | 209 | } |
johnc@4333 | 210 | return; |
johnc@4333 | 211 | } |
johnc@4333 | 212 | // Double capacity if possible |
johnc@4333 | 213 | jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
johnc@4333 | 214 | // Do not give up existing stack until we have managed to |
johnc@4333 | 215 | // get the double capacity that we desired. |
johnc@4333 | 216 | ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
johnc@4333 | 217 | sizeof(oop))); |
johnc@4333 | 218 | if (rs.is_reserved()) { |
johnc@4333 | 219 | // Release the backing store associated with old stack |
johnc@4333 | 220 | _virtual_space.release(); |
johnc@4333 | 221 | // Reinitialize virtual space for new stack |
johnc@4333 | 222 | if (!_virtual_space.initialize(rs, rs.size())) { |
johnc@4333 | 223 | fatal("Not enough swap for expanded marking stack capacity"); |
johnc@4333 | 224 | } |
johnc@4333 | 225 | _base = (oop*)(_virtual_space.low()); |
johnc@4333 | 226 | _index = 0; |
johnc@4333 | 227 | _capacity = new_capacity; |
johnc@4333 | 228 | } else { |
johnc@4333 | 229 | if (PrintGCDetails && Verbose) { |
johnc@4333 | 230 | // Failed to double capacity, continue; |
johnc@4333 | 231 | gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
johnc@4333 | 232 | SIZE_FORMAT"K to " SIZE_FORMAT"K", |
johnc@4333 | 233 | _capacity / K, new_capacity / K); |
johnc@4333 | 234 | } |
johnc@4333 | 235 | } |
johnc@4333 | 236 | } |
johnc@4333 | 237 | |
johnc@4333 | 238 | void CMMarkStack::set_should_expand() { |
johnc@4333 | 239 | // If we're resetting the marking state because of an |
johnc@4333 | 240 | // marking stack overflow, record that we should, if |
johnc@4333 | 241 | // possible, expand the stack. |
johnc@4333 | 242 | _should_expand = _cm->has_overflown(); |
ysr@777 | 243 | } |
ysr@777 | 244 | |
ysr@777 | 245 | CMMarkStack::~CMMarkStack() { |
tonyp@2973 | 246 | if (_base != NULL) { |
johnc@4333 | 247 | _base = NULL; |
johnc@4333 | 248 | _virtual_space.release(); |
tonyp@2973 | 249 | } |
ysr@777 | 250 | } |
ysr@777 | 251 | |
ysr@777 | 252 | void CMMarkStack::par_push(oop ptr) { |
ysr@777 | 253 | while (true) { |
ysr@777 | 254 | if (isFull()) { |
ysr@777 | 255 | _overflow = true; |
ysr@777 | 256 | return; |
ysr@777 | 257 | } |
ysr@777 | 258 | // Otherwise... |
ysr@777 | 259 | jint index = _index; |
ysr@777 | 260 | jint next_index = index+1; |
ysr@777 | 261 | jint res = Atomic::cmpxchg(next_index, &_index, index); |
ysr@777 | 262 | if (res == index) { |
ysr@777 | 263 | _base[index] = ptr; |
ysr@777 | 264 | // Note that we don't maintain this atomically. We could, but it |
ysr@777 | 265 | // doesn't seem necessary. |
ysr@777 | 266 | NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
ysr@777 | 267 | return; |
ysr@777 | 268 | } |
ysr@777 | 269 | // Otherwise, we need to try again. |
ysr@777 | 270 | } |
ysr@777 | 271 | } |
ysr@777 | 272 | |
ysr@777 | 273 | void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { |
ysr@777 | 274 | while (true) { |
ysr@777 | 275 | if (isFull()) { |
ysr@777 | 276 | _overflow = true; |
ysr@777 | 277 | return; |
ysr@777 | 278 | } |
ysr@777 | 279 | // Otherwise... |
ysr@777 | 280 | jint index = _index; |
ysr@777 | 281 | jint next_index = index + n; |
ysr@777 | 282 | if (next_index > _capacity) { |
ysr@777 | 283 | _overflow = true; |
ysr@777 | 284 | return; |
ysr@777 | 285 | } |
ysr@777 | 286 | jint res = Atomic::cmpxchg(next_index, &_index, index); |
ysr@777 | 287 | if (res == index) { |
ysr@777 | 288 | for (int i = 0; i < n; i++) { |
johnc@4333 | 289 | int ind = index + i; |
ysr@777 | 290 | assert(ind < _capacity, "By overflow test above."); |
ysr@777 | 291 | _base[ind] = ptr_arr[i]; |
ysr@777 | 292 | } |
ysr@777 | 293 | NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
ysr@777 | 294 | return; |
ysr@777 | 295 | } |
ysr@777 | 296 | // Otherwise, we need to try again. |
ysr@777 | 297 | } |
ysr@777 | 298 | } |
ysr@777 | 299 | |
ysr@777 | 300 | void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { |
ysr@777 | 301 | MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); |
ysr@777 | 302 | jint start = _index; |
ysr@777 | 303 | jint next_index = start + n; |
ysr@777 | 304 | if (next_index > _capacity) { |
ysr@777 | 305 | _overflow = true; |
ysr@777 | 306 | return; |
ysr@777 | 307 | } |
ysr@777 | 308 | // Otherwise. |
ysr@777 | 309 | _index = next_index; |
ysr@777 | 310 | for (int i = 0; i < n; i++) { |
ysr@777 | 311 | int ind = start + i; |
tonyp@1458 | 312 | assert(ind < _capacity, "By overflow test above."); |
ysr@777 | 313 | _base[ind] = ptr_arr[i]; |
ysr@777 | 314 | } |
johnc@4333 | 315 | NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
ysr@777 | 316 | } |
ysr@777 | 317 | |
ysr@777 | 318 | bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { |
ysr@777 | 319 | MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); |
ysr@777 | 320 | jint index = _index; |
ysr@777 | 321 | if (index == 0) { |
ysr@777 | 322 | *n = 0; |
ysr@777 | 323 | return false; |
ysr@777 | 324 | } else { |
ysr@777 | 325 | int k = MIN2(max, index); |
johnc@4333 | 326 | jint new_ind = index - k; |
ysr@777 | 327 | for (int j = 0; j < k; j++) { |
ysr@777 | 328 | ptr_arr[j] = _base[new_ind + j]; |
ysr@777 | 329 | } |
ysr@777 | 330 | _index = new_ind; |
ysr@777 | 331 | *n = k; |
ysr@777 | 332 | return true; |
ysr@777 | 333 | } |
ysr@777 | 334 | } |
ysr@777 | 335 | |
ysr@777 | 336 | template<class OopClosureClass> |
ysr@777 | 337 | bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { |
ysr@777 | 338 | assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after |
ysr@777 | 339 | || SafepointSynchronize::is_at_safepoint(), |
ysr@777 | 340 | "Drain recursion must be yield-safe."); |
ysr@777 | 341 | bool res = true; |
ysr@777 | 342 | debug_only(_drain_in_progress = true); |
ysr@777 | 343 | debug_only(_drain_in_progress_yields = yield_after); |
ysr@777 | 344 | while (!isEmpty()) { |
ysr@777 | 345 | oop newOop = pop(); |
ysr@777 | 346 | assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); |
ysr@777 | 347 | assert(newOop->is_oop(), "Expected an oop"); |
ysr@777 | 348 | assert(bm == NULL || bm->isMarked((HeapWord*)newOop), |
ysr@777 | 349 | "only grey objects on this stack"); |
ysr@777 | 350 | newOop->oop_iterate(cl); |
ysr@777 | 351 | if (yield_after && _cm->do_yield_check()) { |
tonyp@2973 | 352 | res = false; |
tonyp@2973 | 353 | break; |
ysr@777 | 354 | } |
ysr@777 | 355 | } |
ysr@777 | 356 | debug_only(_drain_in_progress = false); |
ysr@777 | 357 | return res; |
ysr@777 | 358 | } |
ysr@777 | 359 | |
tonyp@3416 | 360 | void CMMarkStack::note_start_of_gc() { |
tonyp@3416 | 361 | assert(_saved_index == -1, |
tonyp@3416 | 362 | "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
tonyp@3416 | 363 | _saved_index = _index; |
tonyp@3416 | 364 | } |
tonyp@3416 | 365 | |
tonyp@3416 | 366 | void CMMarkStack::note_end_of_gc() { |
tonyp@3416 | 367 | // This is intentionally a guarantee, instead of an assert. If we |
tonyp@3416 | 368 | // accidentally add something to the mark stack during GC, it |
tonyp@3416 | 369 | // will be a correctness issue so it's better if we crash. we'll |
tonyp@3416 | 370 | // only check this once per GC anyway, so it won't be a performance |
tonyp@3416 | 371 | // issue in any way. |
tonyp@3416 | 372 | guarantee(_saved_index == _index, |
tonyp@3416 | 373 | err_msg("saved index: %d index: %d", _saved_index, _index)); |
tonyp@3416 | 374 | _saved_index = -1; |
tonyp@3416 | 375 | } |
tonyp@3416 | 376 | |
ysr@777 | 377 | void CMMarkStack::oops_do(OopClosure* f) { |
tonyp@3416 | 378 | assert(_saved_index == _index, |
tonyp@3416 | 379 | err_msg("saved index: %d index: %d", _saved_index, _index)); |
tonyp@3416 | 380 | for (int i = 0; i < _index; i += 1) { |
ysr@777 | 381 | f->do_oop(&_base[i]); |
ysr@777 | 382 | } |
ysr@777 | 383 | } |
ysr@777 | 384 | |
ysr@777 | 385 | bool ConcurrentMark::not_yet_marked(oop obj) const { |
coleenp@4037 | 386 | return _g1h->is_obj_ill(obj); |
ysr@777 | 387 | } |
ysr@777 | 388 | |
tonyp@3464 | 389 | CMRootRegions::CMRootRegions() : |
tonyp@3464 | 390 | _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
tonyp@3464 | 391 | _should_abort(false), _next_survivor(NULL) { } |
tonyp@3464 | 392 | |
tonyp@3464 | 393 | void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
tonyp@3464 | 394 | _young_list = g1h->young_list(); |
tonyp@3464 | 395 | _cm = cm; |
tonyp@3464 | 396 | } |
tonyp@3464 | 397 | |
tonyp@3464 | 398 | void CMRootRegions::prepare_for_scan() { |
tonyp@3464 | 399 | assert(!scan_in_progress(), "pre-condition"); |
tonyp@3464 | 400 | |
tonyp@3464 | 401 | // Currently, only survivors can be root regions. |
tonyp@3464 | 402 | assert(_next_survivor == NULL, "pre-condition"); |
tonyp@3464 | 403 | _next_survivor = _young_list->first_survivor_region(); |
tonyp@3464 | 404 | _scan_in_progress = (_next_survivor != NULL); |
tonyp@3464 | 405 | _should_abort = false; |
tonyp@3464 | 406 | } |
tonyp@3464 | 407 | |
tonyp@3464 | 408 | HeapRegion* CMRootRegions::claim_next() { |
tonyp@3464 | 409 | if (_should_abort) { |
tonyp@3464 | 410 | // If someone has set the should_abort flag, we return NULL to |
tonyp@3464 | 411 | // force the caller to bail out of their loop. |
tonyp@3464 | 412 | return NULL; |
tonyp@3464 | 413 | } |
tonyp@3464 | 414 | |
tonyp@3464 | 415 | // Currently, only survivors can be root regions. |
tonyp@3464 | 416 | HeapRegion* res = _next_survivor; |
tonyp@3464 | 417 | if (res != NULL) { |
tonyp@3464 | 418 | MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
tonyp@3464 | 419 | // Read it again in case it changed while we were waiting for the lock. |
tonyp@3464 | 420 | res = _next_survivor; |
tonyp@3464 | 421 | if (res != NULL) { |
tonyp@3464 | 422 | if (res == _young_list->last_survivor_region()) { |
tonyp@3464 | 423 | // We just claimed the last survivor so store NULL to indicate |
tonyp@3464 | 424 | // that we're done. |
tonyp@3464 | 425 | _next_survivor = NULL; |
tonyp@3464 | 426 | } else { |
tonyp@3464 | 427 | _next_survivor = res->get_next_young_region(); |
tonyp@3464 | 428 | } |
tonyp@3464 | 429 | } else { |
tonyp@3464 | 430 | // Someone else claimed the last survivor while we were trying |
tonyp@3464 | 431 | // to take the lock so nothing else to do. |
tonyp@3464 | 432 | } |
tonyp@3464 | 433 | } |
tonyp@3464 | 434 | assert(res == NULL || res->is_survivor(), "post-condition"); |
tonyp@3464 | 435 | |
tonyp@3464 | 436 | return res; |
tonyp@3464 | 437 | } |
tonyp@3464 | 438 | |
tonyp@3464 | 439 | void CMRootRegions::scan_finished() { |
tonyp@3464 | 440 | assert(scan_in_progress(), "pre-condition"); |
tonyp@3464 | 441 | |
tonyp@3464 | 442 | // Currently, only survivors can be root regions. |
tonyp@3464 | 443 | if (!_should_abort) { |
tonyp@3464 | 444 | assert(_next_survivor == NULL, "we should have claimed all survivors"); |
tonyp@3464 | 445 | } |
tonyp@3464 | 446 | _next_survivor = NULL; |
tonyp@3464 | 447 | |
tonyp@3464 | 448 | { |
tonyp@3464 | 449 | MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
tonyp@3464 | 450 | _scan_in_progress = false; |
tonyp@3464 | 451 | RootRegionScan_lock->notify_all(); |
tonyp@3464 | 452 | } |
tonyp@3464 | 453 | } |
tonyp@3464 | 454 | |
tonyp@3464 | 455 | bool CMRootRegions::wait_until_scan_finished() { |
tonyp@3464 | 456 | if (!scan_in_progress()) return false; |
tonyp@3464 | 457 | |
tonyp@3464 | 458 | { |
tonyp@3464 | 459 | MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
tonyp@3464 | 460 | while (scan_in_progress()) { |
tonyp@3464 | 461 | RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
tonyp@3464 | 462 | } |
tonyp@3464 | 463 | } |
tonyp@3464 | 464 | return true; |
tonyp@3464 | 465 | } |
tonyp@3464 | 466 | |
ysr@777 | 467 | #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
ysr@777 | 468 | #pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
ysr@777 | 469 | #endif // _MSC_VER |
ysr@777 | 470 | |
jmasa@3357 | 471 | uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
jmasa@3357 | 472 | return MAX2((n_par_threads + 2) / 4, 1U); |
jmasa@3294 | 473 | } |
jmasa@3294 | 474 | |
johnc@4333 | 475 | ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) : |
johnc@4333 | 476 | _g1h(g1h), |
johnc@4333 | 477 | _markBitMap1(MinObjAlignment - 1), |
johnc@4333 | 478 | _markBitMap2(MinObjAlignment - 1), |
ysr@777 | 479 | |
ysr@777 | 480 | _parallel_marking_threads(0), |
jmasa@3294 | 481 | _max_parallel_marking_threads(0), |
ysr@777 | 482 | _sleep_factor(0.0), |
ysr@777 | 483 | _marking_task_overhead(1.0), |
ysr@777 | 484 | _cleanup_sleep_factor(0.0), |
ysr@777 | 485 | _cleanup_task_overhead(1.0), |
tonyp@2472 | 486 | _cleanup_list("Cleanup List"), |
johnc@4333 | 487 | _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
johnc@4333 | 488 | _card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >> |
johnc@4333 | 489 | CardTableModRefBS::card_shift, |
johnc@4333 | 490 | false /* in_resource_area*/), |
johnc@3463 | 491 | |
ysr@777 | 492 | _prevMarkBitMap(&_markBitMap1), |
ysr@777 | 493 | _nextMarkBitMap(&_markBitMap2), |
ysr@777 | 494 | |
ysr@777 | 495 | _markStack(this), |
ysr@777 | 496 | // _finger set in set_non_marking_state |
ysr@777 | 497 | |
johnc@4173 | 498 | _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
ysr@777 | 499 | // _active_tasks set in set_non_marking_state |
ysr@777 | 500 | // _tasks set inside the constructor |
johnc@4173 | 501 | _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
johnc@4173 | 502 | _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
ysr@777 | 503 | |
ysr@777 | 504 | _has_overflown(false), |
ysr@777 | 505 | _concurrent(false), |
tonyp@1054 | 506 | _has_aborted(false), |
tonyp@1054 | 507 | _restart_for_overflow(false), |
tonyp@1054 | 508 | _concurrent_marking_in_progress(false), |
ysr@777 | 509 | |
ysr@777 | 510 | // _verbose_level set below |
ysr@777 | 511 | |
ysr@777 | 512 | _init_times(), |
ysr@777 | 513 | _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), |
ysr@777 | 514 | _cleanup_times(), |
ysr@777 | 515 | _total_counting_time(0.0), |
ysr@777 | 516 | _total_rs_scrub_time(0.0), |
johnc@3463 | 517 | |
johnc@3463 | 518 | _parallel_workers(NULL), |
johnc@3463 | 519 | |
johnc@3463 | 520 | _count_card_bitmaps(NULL), |
johnc@4333 | 521 | _count_marked_bytes(NULL), |
johnc@4333 | 522 | _completed_initialization(false) { |
tonyp@2973 | 523 | CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
tonyp@2973 | 524 | if (verbose_level < no_verbose) { |
ysr@777 | 525 | verbose_level = no_verbose; |
tonyp@2973 | 526 | } |
tonyp@2973 | 527 | if (verbose_level > high_verbose) { |
ysr@777 | 528 | verbose_level = high_verbose; |
tonyp@2973 | 529 | } |
ysr@777 | 530 | _verbose_level = verbose_level; |
ysr@777 | 531 | |
tonyp@2973 | 532 | if (verbose_low()) { |
ysr@777 | 533 | gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
ysr@777 | 534 | "heap end = "PTR_FORMAT, _heap_start, _heap_end); |
tonyp@2973 | 535 | } |
ysr@777 | 536 | |
johnc@4333 | 537 | if (!_markBitMap1.allocate(heap_rs)) { |
johnc@4333 | 538 | warning("Failed to allocate first CM bit map"); |
johnc@4333 | 539 | return; |
johnc@4333 | 540 | } |
johnc@4333 | 541 | if (!_markBitMap2.allocate(heap_rs)) { |
johnc@4333 | 542 | warning("Failed to allocate second CM bit map"); |
johnc@4333 | 543 | return; |
johnc@4333 | 544 | } |
ysr@777 | 545 | |
ysr@777 | 546 | // Create & start a ConcurrentMark thread. |
ysr@1280 | 547 | _cmThread = new ConcurrentMarkThread(this); |
ysr@1280 | 548 | assert(cmThread() != NULL, "CM Thread should have been created"); |
ysr@1280 | 549 | assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
ysr@1280 | 550 | |
ysr@777 | 551 | assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
johnc@4333 | 552 | assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency"); |
johnc@4333 | 553 | assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency"); |
ysr@777 | 554 | |
ysr@777 | 555 | SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
tonyp@1717 | 556 | satb_qs.set_buffer_size(G1SATBBufferSize); |
ysr@777 | 557 | |
tonyp@3464 | 558 | _root_regions.init(_g1h, this); |
tonyp@3464 | 559 | |
jmasa@1719 | 560 | if (ConcGCThreads > ParallelGCThreads) { |
johnc@4333 | 561 | warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") " |
johnc@4333 | 562 | "than ParallelGCThreads (" UINT32_FORMAT ").", |
johnc@4333 | 563 | ConcGCThreads, ParallelGCThreads); |
johnc@4333 | 564 | return; |
ysr@777 | 565 | } |
ysr@777 | 566 | if (ParallelGCThreads == 0) { |
ysr@777 | 567 | // if we are not running with any parallel GC threads we will not |
ysr@777 | 568 | // spawn any marking threads either |
jmasa@3294 | 569 | _parallel_marking_threads = 0; |
jmasa@3294 | 570 | _max_parallel_marking_threads = 0; |
jmasa@3294 | 571 | _sleep_factor = 0.0; |
jmasa@3294 | 572 | _marking_task_overhead = 1.0; |
ysr@777 | 573 | } else { |
jmasa@1719 | 574 | if (ConcGCThreads > 0) { |
jmasa@1719 | 575 | // notice that ConcGCThreads overwrites G1MarkingOverheadPercent |
ysr@777 | 576 | // if both are set |
ysr@777 | 577 | |
jmasa@3357 | 578 | _parallel_marking_threads = (uint) ConcGCThreads; |
jmasa@3294 | 579 | _max_parallel_marking_threads = _parallel_marking_threads; |
ysr@777 | 580 | _sleep_factor = 0.0; |
ysr@777 | 581 | _marking_task_overhead = 1.0; |
johnc@1186 | 582 | } else if (G1MarkingOverheadPercent > 0) { |
ysr@777 | 583 | // we will calculate the number of parallel marking threads |
ysr@777 | 584 | // based on a target overhead with respect to the soft real-time |
ysr@777 | 585 | // goal |
ysr@777 | 586 | |
johnc@1186 | 587 | double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
ysr@777 | 588 | double overall_cm_overhead = |
johnc@1186 | 589 | (double) MaxGCPauseMillis * marking_overhead / |
johnc@1186 | 590 | (double) GCPauseIntervalMillis; |
ysr@777 | 591 | double cpu_ratio = 1.0 / (double) os::processor_count(); |
ysr@777 | 592 | double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); |
ysr@777 | 593 | double marking_task_overhead = |
ysr@777 | 594 | overall_cm_overhead / marking_thread_num * |
ysr@777 | 595 | (double) os::processor_count(); |
ysr@777 | 596 | double sleep_factor = |
ysr@777 | 597 | (1.0 - marking_task_overhead) / marking_task_overhead; |
ysr@777 | 598 | |
jmasa@3357 | 599 | _parallel_marking_threads = (uint) marking_thread_num; |
jmasa@3294 | 600 | _max_parallel_marking_threads = _parallel_marking_threads; |
ysr@777 | 601 | _sleep_factor = sleep_factor; |
ysr@777 | 602 | _marking_task_overhead = marking_task_overhead; |
ysr@777 | 603 | } else { |
jmasa@3357 | 604 | _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
jmasa@3294 | 605 | _max_parallel_marking_threads = _parallel_marking_threads; |
ysr@777 | 606 | _sleep_factor = 0.0; |
ysr@777 | 607 | _marking_task_overhead = 1.0; |
ysr@777 | 608 | } |
ysr@777 | 609 | |
tonyp@2973 | 610 | if (parallel_marking_threads() > 1) { |
ysr@777 | 611 | _cleanup_task_overhead = 1.0; |
tonyp@2973 | 612 | } else { |
ysr@777 | 613 | _cleanup_task_overhead = marking_task_overhead(); |
tonyp@2973 | 614 | } |
ysr@777 | 615 | _cleanup_sleep_factor = |
ysr@777 | 616 | (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); |
ysr@777 | 617 | |
ysr@777 | 618 | #if 0 |
ysr@777 | 619 | gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); |
ysr@777 | 620 | gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); |
ysr@777 | 621 | gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); |
ysr@777 | 622 | gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); |
ysr@777 | 623 | gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); |
ysr@777 | 624 | #endif |
ysr@777 | 625 | |
tonyp@1458 | 626 | guarantee(parallel_marking_threads() > 0, "peace of mind"); |
jmasa@2188 | 627 | _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
jmasa@3357 | 628 | _max_parallel_marking_threads, false, true); |
jmasa@2188 | 629 | if (_parallel_workers == NULL) { |
ysr@777 | 630 | vm_exit_during_initialization("Failed necessary allocation."); |
jmasa@2188 | 631 | } else { |
jmasa@2188 | 632 | _parallel_workers->initialize_workers(); |
jmasa@2188 | 633 | } |
ysr@777 | 634 | } |
ysr@777 | 635 | |
johnc@4333 | 636 | if (FLAG_IS_DEFAULT(MarkStackSize)) { |
johnc@4333 | 637 | uintx mark_stack_size = |
johnc@4333 | 638 | MIN2(MarkStackSizeMax, |
johnc@4333 | 639 | MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
johnc@4333 | 640 | // Verify that the calculated value for MarkStackSize is in range. |
johnc@4333 | 641 | // It would be nice to use the private utility routine from Arguments. |
johnc@4333 | 642 | if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
johnc@4333 | 643 | warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
johnc@4333 | 644 | "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
johnc@4333 | 645 | mark_stack_size, 1, MarkStackSizeMax); |
johnc@4333 | 646 | return; |
johnc@4333 | 647 | } |
johnc@4333 | 648 | FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
johnc@4333 | 649 | } else { |
johnc@4333 | 650 | // Verify MarkStackSize is in range. |
johnc@4333 | 651 | if (FLAG_IS_CMDLINE(MarkStackSize)) { |
johnc@4333 | 652 | if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
johnc@4333 | 653 | if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
johnc@4333 | 654 | warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
johnc@4333 | 655 | "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
johnc@4333 | 656 | MarkStackSize, 1, MarkStackSizeMax); |
johnc@4333 | 657 | return; |
johnc@4333 | 658 | } |
johnc@4333 | 659 | } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
johnc@4333 | 660 | if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
johnc@4333 | 661 | warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
johnc@4333 | 662 | " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
johnc@4333 | 663 | MarkStackSize, MarkStackSizeMax); |
johnc@4333 | 664 | return; |
johnc@4333 | 665 | } |
johnc@4333 | 666 | } |
johnc@4333 | 667 | } |
johnc@4333 | 668 | } |
johnc@4333 | 669 | |
johnc@4333 | 670 | if (!_markStack.allocate(MarkStackSize)) { |
johnc@4333 | 671 | warning("Failed to allocate CM marking stack"); |
johnc@4333 | 672 | return; |
johnc@4333 | 673 | } |
johnc@4333 | 674 | |
johnc@4333 | 675 | _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
johnc@4333 | 676 | _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
johnc@4333 | 677 | |
johnc@4333 | 678 | _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
johnc@4333 | 679 | _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
johnc@4333 | 680 | |
johnc@4333 | 681 | BitMap::idx_t card_bm_size = _card_bm.size(); |
johnc@4333 | 682 | |
johnc@4333 | 683 | // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
johnc@4333 | 684 | _active_tasks = _max_worker_id; |
johnc@4333 | 685 | |
johnc@4333 | 686 | size_t max_regions = (size_t) _g1h->max_regions(); |
johnc@4333 | 687 | for (uint i = 0; i < _max_worker_id; ++i) { |
johnc@4333 | 688 | CMTaskQueue* task_queue = new CMTaskQueue(); |
johnc@4333 | 689 | task_queue->initialize(); |
johnc@4333 | 690 | _task_queues->register_queue(i, task_queue); |
johnc@4333 | 691 | |
johnc@4333 | 692 | _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
johnc@4333 | 693 | _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
johnc@4333 | 694 | |
johnc@4333 | 695 | _tasks[i] = new CMTask(i, this, |
johnc@4333 | 696 | _count_marked_bytes[i], |
johnc@4333 | 697 | &_count_card_bitmaps[i], |
johnc@4333 | 698 | task_queue, _task_queues); |
johnc@4333 | 699 | |
johnc@4333 | 700 | _accum_task_vtime[i] = 0.0; |
johnc@4333 | 701 | } |
johnc@4333 | 702 | |
johnc@4333 | 703 | // Calculate the card number for the bottom of the heap. Used |
johnc@4333 | 704 | // in biasing indexes into the accounting card bitmaps. |
johnc@4333 | 705 | _heap_bottom_card_num = |
johnc@4333 | 706 | intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
johnc@4333 | 707 | CardTableModRefBS::card_shift); |
johnc@4333 | 708 | |
johnc@4333 | 709 | // Clear all the liveness counting data |
johnc@4333 | 710 | clear_all_count_data(); |
johnc@4333 | 711 | |
ysr@777 | 712 | // so that the call below can read a sensible value |
johnc@4333 | 713 | _heap_start = (HeapWord*) heap_rs.base(); |
ysr@777 | 714 | set_non_marking_state(); |
johnc@4333 | 715 | _completed_initialization = true; |
ysr@777 | 716 | } |
ysr@777 | 717 | |
ysr@777 | 718 | void ConcurrentMark::update_g1_committed(bool force) { |
ysr@777 | 719 | // If concurrent marking is not in progress, then we do not need to |
tonyp@3691 | 720 | // update _heap_end. |
tonyp@2973 | 721 | if (!concurrent_marking_in_progress() && !force) return; |
ysr@777 | 722 | |
ysr@777 | 723 | MemRegion committed = _g1h->g1_committed(); |
tonyp@1458 | 724 | assert(committed.start() == _heap_start, "start shouldn't change"); |
ysr@777 | 725 | HeapWord* new_end = committed.end(); |
ysr@777 | 726 | if (new_end > _heap_end) { |
ysr@777 | 727 | // The heap has been expanded. |
ysr@777 | 728 | |
ysr@777 | 729 | _heap_end = new_end; |
ysr@777 | 730 | } |
ysr@777 | 731 | // Notice that the heap can also shrink. However, this only happens |
ysr@777 | 732 | // during a Full GC (at least currently) and the entire marking |
ysr@777 | 733 | // phase will bail out and the task will not be restarted. So, let's |
ysr@777 | 734 | // do nothing. |
ysr@777 | 735 | } |
ysr@777 | 736 | |
ysr@777 | 737 | void ConcurrentMark::reset() { |
ysr@777 | 738 | // Starting values for these two. This should be called in a STW |
ysr@777 | 739 | // phase. CM will be notified of any future g1_committed expansions |
ysr@777 | 740 | // will be at the end of evacuation pauses, when tasks are |
ysr@777 | 741 | // inactive. |
ysr@777 | 742 | MemRegion committed = _g1h->g1_committed(); |
ysr@777 | 743 | _heap_start = committed.start(); |
ysr@777 | 744 | _heap_end = committed.end(); |
ysr@777 | 745 | |
tonyp@1458 | 746 | // Separated the asserts so that we know which one fires. |
tonyp@1458 | 747 | assert(_heap_start != NULL, "heap bounds should look ok"); |
tonyp@1458 | 748 | assert(_heap_end != NULL, "heap bounds should look ok"); |
tonyp@1458 | 749 | assert(_heap_start < _heap_end, "heap bounds should look ok"); |
ysr@777 | 750 | |
johnc@4386 | 751 | // Reset all the marking data structures and any necessary flags |
johnc@4386 | 752 | reset_marking_state(); |
ysr@777 | 753 | |
tonyp@2973 | 754 | if (verbose_low()) { |
ysr@777 | 755 | gclog_or_tty->print_cr("[global] resetting"); |
tonyp@2973 | 756 | } |
ysr@777 | 757 | |
ysr@777 | 758 | // We do reset all of them, since different phases will use |
ysr@777 | 759 | // different number of active threads. So, it's easiest to have all |
ysr@777 | 760 | // of them ready. |
johnc@4173 | 761 | for (uint i = 0; i < _max_worker_id; ++i) { |
ysr@777 | 762 | _tasks[i]->reset(_nextMarkBitMap); |
johnc@2190 | 763 | } |
ysr@777 | 764 | |
ysr@777 | 765 | // we need this to make sure that the flag is on during the evac |
ysr@777 | 766 | // pause with initial mark piggy-backed |
ysr@777 | 767 | set_concurrent_marking_in_progress(); |
ysr@777 | 768 | } |
ysr@777 | 769 | |
johnc@4386 | 770 | |
johnc@4386 | 771 | void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
johnc@4386 | 772 | _markStack.set_should_expand(); |
johnc@4386 | 773 | _markStack.setEmpty(); // Also clears the _markStack overflow flag |
johnc@4386 | 774 | if (clear_overflow) { |
johnc@4386 | 775 | clear_has_overflown(); |
johnc@4386 | 776 | } else { |
johnc@4386 | 777 | assert(has_overflown(), "pre-condition"); |
johnc@4386 | 778 | } |
johnc@4386 | 779 | _finger = _heap_start; |
johnc@4386 | 780 | |
johnc@4386 | 781 | for (uint i = 0; i < _max_worker_id; ++i) { |
johnc@4386 | 782 | CMTaskQueue* queue = _task_queues->queue(i); |
johnc@4386 | 783 | queue->set_empty(); |
johnc@4386 | 784 | } |
johnc@4386 | 785 | } |
johnc@4386 | 786 | |
jmasa@3357 | 787 | void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
johnc@4173 | 788 | assert(active_tasks <= _max_worker_id, "we should not have more"); |
ysr@777 | 789 | |
ysr@777 | 790 | _active_tasks = active_tasks; |
ysr@777 | 791 | // Need to update the three data structures below according to the |
ysr@777 | 792 | // number of active threads for this phase. |
ysr@777 | 793 | _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); |
ysr@777 | 794 | _first_overflow_barrier_sync.set_n_workers((int) active_tasks); |
ysr@777 | 795 | _second_overflow_barrier_sync.set_n_workers((int) active_tasks); |
ysr@777 | 796 | |
ysr@777 | 797 | _concurrent = concurrent; |
ysr@777 | 798 | // We propagate this to all tasks, not just the active ones. |
johnc@4173 | 799 | for (uint i = 0; i < _max_worker_id; ++i) |
ysr@777 | 800 | _tasks[i]->set_concurrent(concurrent); |
ysr@777 | 801 | |
ysr@777 | 802 | if (concurrent) { |
ysr@777 | 803 | set_concurrent_marking_in_progress(); |
ysr@777 | 804 | } else { |
ysr@777 | 805 | // We currently assume that the concurrent flag has been set to |
ysr@777 | 806 | // false before we start remark. At this point we should also be |
ysr@777 | 807 | // in a STW phase. |
tonyp@1458 | 808 | assert(!concurrent_marking_in_progress(), "invariant"); |
tonyp@1458 | 809 | assert(_finger == _heap_end, "only way to get here"); |
ysr@777 | 810 | update_g1_committed(true); |
ysr@777 | 811 | } |
ysr@777 | 812 | } |
ysr@777 | 813 | |
ysr@777 | 814 | void ConcurrentMark::set_non_marking_state() { |
ysr@777 | 815 | // We set the global marking state to some default values when we're |
ysr@777 | 816 | // not doing marking. |
johnc@4386 | 817 | reset_marking_state(); |
ysr@777 | 818 | _active_tasks = 0; |
ysr@777 | 819 | clear_concurrent_marking_in_progress(); |
ysr@777 | 820 | } |
ysr@777 | 821 | |
ysr@777 | 822 | ConcurrentMark::~ConcurrentMark() { |
stefank@3364 | 823 | // The ConcurrentMark instance is never freed. |
stefank@3364 | 824 | ShouldNotReachHere(); |
ysr@777 | 825 | } |
ysr@777 | 826 | |
ysr@777 | 827 | void ConcurrentMark::clearNextBitmap() { |
tonyp@1794 | 828 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
tonyp@1794 | 829 | G1CollectorPolicy* g1p = g1h->g1_policy(); |
tonyp@1794 | 830 | |
tonyp@1794 | 831 | // Make sure that the concurrent mark thread looks to still be in |
tonyp@1794 | 832 | // the current cycle. |
tonyp@1794 | 833 | guarantee(cmThread()->during_cycle(), "invariant"); |
tonyp@1794 | 834 | |
tonyp@1794 | 835 | // We are finishing up the current cycle by clearing the next |
tonyp@1794 | 836 | // marking bitmap and getting it ready for the next cycle. During |
tonyp@1794 | 837 | // this time no other cycle can start. So, let's make sure that this |
tonyp@1794 | 838 | // is the case. |
tonyp@1794 | 839 | guarantee(!g1h->mark_in_progress(), "invariant"); |
tonyp@1794 | 840 | |
tonyp@1794 | 841 | // clear the mark bitmap (no grey objects to start with). |
tonyp@1794 | 842 | // We need to do this in chunks and offer to yield in between |
tonyp@1794 | 843 | // each chunk. |
tonyp@1794 | 844 | HeapWord* start = _nextMarkBitMap->startWord(); |
tonyp@1794 | 845 | HeapWord* end = _nextMarkBitMap->endWord(); |
tonyp@1794 | 846 | HeapWord* cur = start; |
tonyp@1794 | 847 | size_t chunkSize = M; |
tonyp@1794 | 848 | while (cur < end) { |
tonyp@1794 | 849 | HeapWord* next = cur + chunkSize; |
tonyp@2973 | 850 | if (next > end) { |
tonyp@1794 | 851 | next = end; |
tonyp@2973 | 852 | } |
tonyp@1794 | 853 | MemRegion mr(cur,next); |
tonyp@1794 | 854 | _nextMarkBitMap->clearRange(mr); |
tonyp@1794 | 855 | cur = next; |
tonyp@1794 | 856 | do_yield_check(); |
tonyp@1794 | 857 | |
tonyp@1794 | 858 | // Repeat the asserts from above. We'll do them as asserts here to |
tonyp@1794 | 859 | // minimize their overhead on the product. However, we'll have |
tonyp@1794 | 860 | // them as guarantees at the beginning / end of the bitmap |
tonyp@1794 | 861 | // clearing to get some checking in the product. |
tonyp@1794 | 862 | assert(cmThread()->during_cycle(), "invariant"); |
tonyp@1794 | 863 | assert(!g1h->mark_in_progress(), "invariant"); |
tonyp@1794 | 864 | } |
tonyp@1794 | 865 | |
johnc@3463 | 866 | // Clear the liveness counting data |
johnc@3463 | 867 | clear_all_count_data(); |
johnc@3463 | 868 | |
tonyp@1794 | 869 | // Repeat the asserts from above. |
tonyp@1794 | 870 | guarantee(cmThread()->during_cycle(), "invariant"); |
tonyp@1794 | 871 | guarantee(!g1h->mark_in_progress(), "invariant"); |
ysr@777 | 872 | } |
ysr@777 | 873 | |
ysr@777 | 874 | class NoteStartOfMarkHRClosure: public HeapRegionClosure { |
ysr@777 | 875 | public: |
ysr@777 | 876 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 877 | if (!r->continuesHumongous()) { |
tonyp@3416 | 878 | r->note_start_of_marking(); |
ysr@777 | 879 | } |
ysr@777 | 880 | return false; |
ysr@777 | 881 | } |
ysr@777 | 882 | }; |
ysr@777 | 883 | |
ysr@777 | 884 | void ConcurrentMark::checkpointRootsInitialPre() { |
ysr@777 | 885 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 886 | G1CollectorPolicy* g1p = g1h->g1_policy(); |
ysr@777 | 887 | |
ysr@777 | 888 | _has_aborted = false; |
ysr@777 | 889 | |
jcoomes@1902 | 890 | #ifndef PRODUCT |
tonyp@1479 | 891 | if (G1PrintReachableAtInitialMark) { |
tonyp@1823 | 892 | print_reachable("at-cycle-start", |
johnc@2969 | 893 | VerifyOption_G1UsePrevMarking, true /* all */); |
tonyp@1479 | 894 | } |
jcoomes@1902 | 895 | #endif |
ysr@777 | 896 | |
ysr@777 | 897 | // Initialise marking structures. This has to be done in a STW phase. |
ysr@777 | 898 | reset(); |
tonyp@3416 | 899 | |
tonyp@3416 | 900 | // For each region note start of marking. |
tonyp@3416 | 901 | NoteStartOfMarkHRClosure startcl; |
tonyp@3416 | 902 | g1h->heap_region_iterate(&startcl); |
ysr@777 | 903 | } |
ysr@777 | 904 | |
ysr@777 | 905 | |
ysr@777 | 906 | void ConcurrentMark::checkpointRootsInitialPost() { |
ysr@777 | 907 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 908 | |
tonyp@2848 | 909 | // If we force an overflow during remark, the remark operation will |
tonyp@2848 | 910 | // actually abort and we'll restart concurrent marking. If we always |
tonyp@2848 | 911 | // force an oveflow during remark we'll never actually complete the |
tonyp@2848 | 912 | // marking phase. So, we initilize this here, at the start of the |
tonyp@2848 | 913 | // cycle, so that at the remaining overflow number will decrease at |
tonyp@2848 | 914 | // every remark and we'll eventually not need to cause one. |
tonyp@2848 | 915 | force_overflow_stw()->init(); |
tonyp@2848 | 916 | |
johnc@3175 | 917 | // Start Concurrent Marking weak-reference discovery. |
johnc@3175 | 918 | ReferenceProcessor* rp = g1h->ref_processor_cm(); |
johnc@3175 | 919 | // enable ("weak") refs discovery |
johnc@3175 | 920 | rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
ysr@892 | 921 | rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
ysr@777 | 922 | |
ysr@777 | 923 | SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
tonyp@1752 | 924 | // This is the start of the marking cycle, we're expected all |
tonyp@1752 | 925 | // threads to have SATB queues with active set to false. |
tonyp@1752 | 926 | satb_mq_set.set_active_all_threads(true, /* new active value */ |
tonyp@1752 | 927 | false /* expected_active */); |
ysr@777 | 928 | |
tonyp@3464 | 929 | _root_regions.prepare_for_scan(); |
tonyp@3464 | 930 | |
ysr@777 | 931 | // update_g1_committed() will be called at the end of an evac pause |
ysr@777 | 932 | // when marking is on. So, it's also called at the end of the |
ysr@777 | 933 | // initial-mark pause to update the heap end, if the heap expands |
ysr@777 | 934 | // during it. No need to call it here. |
ysr@777 | 935 | } |
ysr@777 | 936 | |
ysr@777 | 937 | /* |
tonyp@2848 | 938 | * Notice that in the next two methods, we actually leave the STS |
tonyp@2848 | 939 | * during the barrier sync and join it immediately afterwards. If we |
tonyp@2848 | 940 | * do not do this, the following deadlock can occur: one thread could |
tonyp@2848 | 941 | * be in the barrier sync code, waiting for the other thread to also |
tonyp@2848 | 942 | * sync up, whereas another one could be trying to yield, while also |
tonyp@2848 | 943 | * waiting for the other threads to sync up too. |
tonyp@2848 | 944 | * |
tonyp@2848 | 945 | * Note, however, that this code is also used during remark and in |
tonyp@2848 | 946 | * this case we should not attempt to leave / enter the STS, otherwise |
tonyp@2848 | 947 | * we'll either hit an asseert (debug / fastdebug) or deadlock |
tonyp@2848 | 948 | * (product). So we should only leave / enter the STS if we are |
tonyp@2848 | 949 | * operating concurrently. |
tonyp@2848 | 950 | * |
tonyp@2848 | 951 | * Because the thread that does the sync barrier has left the STS, it |
tonyp@2848 | 952 | * is possible to be suspended for a Full GC or an evacuation pause |
tonyp@2848 | 953 | * could occur. This is actually safe, since the entering the sync |
tonyp@2848 | 954 | * barrier is one of the last things do_marking_step() does, and it |
tonyp@2848 | 955 | * doesn't manipulate any data structures afterwards. |
tonyp@2848 | 956 | */ |
ysr@777 | 957 | |
johnc@4173 | 958 | void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
tonyp@2973 | 959 | if (verbose_low()) { |
johnc@4173 | 960 | gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
tonyp@2973 | 961 | } |
ysr@777 | 962 | |
tonyp@2848 | 963 | if (concurrent()) { |
tonyp@2848 | 964 | ConcurrentGCThread::stsLeave(); |
tonyp@2848 | 965 | } |
ysr@777 | 966 | _first_overflow_barrier_sync.enter(); |
tonyp@2848 | 967 | if (concurrent()) { |
tonyp@2848 | 968 | ConcurrentGCThread::stsJoin(); |
tonyp@2848 | 969 | } |
ysr@777 | 970 | // at this point everyone should have synced up and not be doing any |
ysr@777 | 971 | // more work |
ysr@777 | 972 | |
tonyp@2973 | 973 | if (verbose_low()) { |
johnc@4173 | 974 | gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
tonyp@2973 | 975 | } |
ysr@777 | 976 | |
johnc@4173 | 977 | // let the task associated with with worker 0 do this |
johnc@4173 | 978 | if (worker_id == 0) { |
ysr@777 | 979 | // task 0 is responsible for clearing the global data structures |
tonyp@2848 | 980 | // We should be here because of an overflow. During STW we should |
tonyp@2848 | 981 | // not clear the overflow flag since we rely on it being true when |
tonyp@2848 | 982 | // we exit this method to abort the pause and restart concurent |
tonyp@2848 | 983 | // marking. |
johnc@4386 | 984 | reset_marking_state(concurrent() /* clear_overflow */); |
tonyp@2848 | 985 | force_overflow()->update(); |
ysr@777 | 986 | |
brutisso@3710 | 987 | if (G1Log::fine()) { |
ysr@777 | 988 | gclog_or_tty->date_stamp(PrintGCDateStamps); |
ysr@777 | 989 | gclog_or_tty->stamp(PrintGCTimeStamps); |
ysr@777 | 990 | gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
ysr@777 | 991 | } |
ysr@777 | 992 | } |
ysr@777 | 993 | |
ysr@777 | 994 | // after this, each task should reset its own data structures then |
ysr@777 | 995 | // then go into the second barrier |
ysr@777 | 996 | } |
ysr@777 | 997 | |
johnc@4173 | 998 | void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
tonyp@2973 | 999 | if (verbose_low()) { |
johnc@4173 | 1000 | gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
tonyp@2973 | 1001 | } |
ysr@777 | 1002 | |
tonyp@2848 | 1003 | if (concurrent()) { |
tonyp@2848 | 1004 | ConcurrentGCThread::stsLeave(); |
tonyp@2848 | 1005 | } |
ysr@777 | 1006 | _second_overflow_barrier_sync.enter(); |
tonyp@2848 | 1007 | if (concurrent()) { |
tonyp@2848 | 1008 | ConcurrentGCThread::stsJoin(); |
tonyp@2848 | 1009 | } |
ysr@777 | 1010 | // at this point everything should be re-initialised and ready to go |
ysr@777 | 1011 | |
tonyp@2973 | 1012 | if (verbose_low()) { |
johnc@4173 | 1013 | gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
tonyp@2973 | 1014 | } |
ysr@777 | 1015 | } |
ysr@777 | 1016 | |
tonyp@2848 | 1017 | #ifndef PRODUCT |
tonyp@2848 | 1018 | void ForceOverflowSettings::init() { |
tonyp@2848 | 1019 | _num_remaining = G1ConcMarkForceOverflow; |
tonyp@2848 | 1020 | _force = false; |
tonyp@2848 | 1021 | update(); |
tonyp@2848 | 1022 | } |
tonyp@2848 | 1023 | |
tonyp@2848 | 1024 | void ForceOverflowSettings::update() { |
tonyp@2848 | 1025 | if (_num_remaining > 0) { |
tonyp@2848 | 1026 | _num_remaining -= 1; |
tonyp@2848 | 1027 | _force = true; |
tonyp@2848 | 1028 | } else { |
tonyp@2848 | 1029 | _force = false; |
tonyp@2848 | 1030 | } |
tonyp@2848 | 1031 | } |
tonyp@2848 | 1032 | |
tonyp@2848 | 1033 | bool ForceOverflowSettings::should_force() { |
tonyp@2848 | 1034 | if (_force) { |
tonyp@2848 | 1035 | _force = false; |
tonyp@2848 | 1036 | return true; |
tonyp@2848 | 1037 | } else { |
tonyp@2848 | 1038 | return false; |
tonyp@2848 | 1039 | } |
tonyp@2848 | 1040 | } |
tonyp@2848 | 1041 | #endif // !PRODUCT |
tonyp@2848 | 1042 | |
ysr@777 | 1043 | class CMConcurrentMarkingTask: public AbstractGangTask { |
ysr@777 | 1044 | private: |
ysr@777 | 1045 | ConcurrentMark* _cm; |
ysr@777 | 1046 | ConcurrentMarkThread* _cmt; |
ysr@777 | 1047 | |
ysr@777 | 1048 | public: |
jmasa@3357 | 1049 | void work(uint worker_id) { |
tonyp@1458 | 1050 | assert(Thread::current()->is_ConcurrentGC_thread(), |
tonyp@1458 | 1051 | "this should only be done by a conc GC thread"); |
johnc@2316 | 1052 | ResourceMark rm; |
ysr@777 | 1053 | |
ysr@777 | 1054 | double start_vtime = os::elapsedVTime(); |
ysr@777 | 1055 | |
ysr@777 | 1056 | ConcurrentGCThread::stsJoin(); |
ysr@777 | 1057 | |
jmasa@3357 | 1058 | assert(worker_id < _cm->active_tasks(), "invariant"); |
jmasa@3357 | 1059 | CMTask* the_task = _cm->task(worker_id); |
ysr@777 | 1060 | the_task->record_start_time(); |
ysr@777 | 1061 | if (!_cm->has_aborted()) { |
ysr@777 | 1062 | do { |
ysr@777 | 1063 | double start_vtime_sec = os::elapsedVTime(); |
ysr@777 | 1064 | double start_time_sec = os::elapsedTime(); |
johnc@2494 | 1065 | double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
johnc@2494 | 1066 | |
johnc@2494 | 1067 | the_task->do_marking_step(mark_step_duration_ms, |
johnc@2494 | 1068 | true /* do_stealing */, |
johnc@2494 | 1069 | true /* do_termination */); |
johnc@2494 | 1070 | |
ysr@777 | 1071 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 1072 | double end_vtime_sec = os::elapsedVTime(); |
ysr@777 | 1073 | double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; |
ysr@777 | 1074 | double elapsed_time_sec = end_time_sec - start_time_sec; |
ysr@777 | 1075 | _cm->clear_has_overflown(); |
ysr@777 | 1076 | |
jmasa@3357 | 1077 | bool ret = _cm->do_yield_check(worker_id); |
ysr@777 | 1078 | |
ysr@777 | 1079 | jlong sleep_time_ms; |
ysr@777 | 1080 | if (!_cm->has_aborted() && the_task->has_aborted()) { |
ysr@777 | 1081 | sleep_time_ms = |
ysr@777 | 1082 | (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); |
ysr@777 | 1083 | ConcurrentGCThread::stsLeave(); |
ysr@777 | 1084 | os::sleep(Thread::current(), sleep_time_ms, false); |
ysr@777 | 1085 | ConcurrentGCThread::stsJoin(); |
ysr@777 | 1086 | } |
ysr@777 | 1087 | double end_time2_sec = os::elapsedTime(); |
ysr@777 | 1088 | double elapsed_time2_sec = end_time2_sec - start_time_sec; |
ysr@777 | 1089 | |
ysr@777 | 1090 | #if 0 |
ysr@777 | 1091 | gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " |
ysr@777 | 1092 | "overhead %1.4lf", |
ysr@777 | 1093 | elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, |
ysr@777 | 1094 | the_task->conc_overhead(os::elapsedTime()) * 8.0); |
ysr@777 | 1095 | gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", |
ysr@777 | 1096 | elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); |
ysr@777 | 1097 | #endif |
ysr@777 | 1098 | } while (!_cm->has_aborted() && the_task->has_aborted()); |
ysr@777 | 1099 | } |
ysr@777 | 1100 | the_task->record_end_time(); |
tonyp@1458 | 1101 | guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
ysr@777 | 1102 | |
ysr@777 | 1103 | ConcurrentGCThread::stsLeave(); |
ysr@777 | 1104 | |
ysr@777 | 1105 | double end_vtime = os::elapsedVTime(); |
jmasa@3357 | 1106 | _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
ysr@777 | 1107 | } |
ysr@777 | 1108 | |
ysr@777 | 1109 | CMConcurrentMarkingTask(ConcurrentMark* cm, |
ysr@777 | 1110 | ConcurrentMarkThread* cmt) : |
ysr@777 | 1111 | AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } |
ysr@777 | 1112 | |
ysr@777 | 1113 | ~CMConcurrentMarkingTask() { } |
ysr@777 | 1114 | }; |
ysr@777 | 1115 | |
jmasa@3294 | 1116 | // Calculates the number of active workers for a concurrent |
jmasa@3294 | 1117 | // phase. |
jmasa@3357 | 1118 | uint ConcurrentMark::calc_parallel_marking_threads() { |
johnc@3338 | 1119 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
jmasa@3357 | 1120 | uint n_conc_workers = 0; |
jmasa@3294 | 1121 | if (!UseDynamicNumberOfGCThreads || |
jmasa@3294 | 1122 | (!FLAG_IS_DEFAULT(ConcGCThreads) && |
jmasa@3294 | 1123 | !ForceDynamicNumberOfGCThreads)) { |
jmasa@3294 | 1124 | n_conc_workers = max_parallel_marking_threads(); |
jmasa@3294 | 1125 | } else { |
jmasa@3294 | 1126 | n_conc_workers = |
jmasa@3294 | 1127 | AdaptiveSizePolicy::calc_default_active_workers( |
jmasa@3294 | 1128 | max_parallel_marking_threads(), |
jmasa@3294 | 1129 | 1, /* Minimum workers */ |
jmasa@3294 | 1130 | parallel_marking_threads(), |
jmasa@3294 | 1131 | Threads::number_of_non_daemon_threads()); |
jmasa@3294 | 1132 | // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
jmasa@3294 | 1133 | // that scaling has already gone into "_max_parallel_marking_threads". |
jmasa@3294 | 1134 | } |
johnc@3338 | 1135 | assert(n_conc_workers > 0, "Always need at least 1"); |
johnc@3338 | 1136 | return n_conc_workers; |
jmasa@3294 | 1137 | } |
johnc@3338 | 1138 | // If we are not running with any parallel GC threads we will not |
johnc@3338 | 1139 | // have spawned any marking threads either. Hence the number of |
johnc@3338 | 1140 | // concurrent workers should be 0. |
johnc@3338 | 1141 | return 0; |
jmasa@3294 | 1142 | } |
jmasa@3294 | 1143 | |
tonyp@3464 | 1144 | void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
tonyp@3464 | 1145 | // Currently, only survivors can be root regions. |
tonyp@3464 | 1146 | assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
tonyp@3464 | 1147 | G1RootRegionScanClosure cl(_g1h, this, worker_id); |
tonyp@3464 | 1148 | |
tonyp@3464 | 1149 | const uintx interval = PrefetchScanIntervalInBytes; |
tonyp@3464 | 1150 | HeapWord* curr = hr->bottom(); |
tonyp@3464 | 1151 | const HeapWord* end = hr->top(); |
tonyp@3464 | 1152 | while (curr < end) { |
tonyp@3464 | 1153 | Prefetch::read(curr, interval); |
tonyp@3464 | 1154 | oop obj = oop(curr); |
tonyp@3464 | 1155 | int size = obj->oop_iterate(&cl); |
tonyp@3464 | 1156 | assert(size == obj->size(), "sanity"); |
tonyp@3464 | 1157 | curr += size; |
tonyp@3464 | 1158 | } |
tonyp@3464 | 1159 | } |
tonyp@3464 | 1160 | |
tonyp@3464 | 1161 | class CMRootRegionScanTask : public AbstractGangTask { |
tonyp@3464 | 1162 | private: |
tonyp@3464 | 1163 | ConcurrentMark* _cm; |
tonyp@3464 | 1164 | |
tonyp@3464 | 1165 | public: |
tonyp@3464 | 1166 | CMRootRegionScanTask(ConcurrentMark* cm) : |
tonyp@3464 | 1167 | AbstractGangTask("Root Region Scan"), _cm(cm) { } |
tonyp@3464 | 1168 | |
tonyp@3464 | 1169 | void work(uint worker_id) { |
tonyp@3464 | 1170 | assert(Thread::current()->is_ConcurrentGC_thread(), |
tonyp@3464 | 1171 | "this should only be done by a conc GC thread"); |
tonyp@3464 | 1172 | |
tonyp@3464 | 1173 | CMRootRegions* root_regions = _cm->root_regions(); |
tonyp@3464 | 1174 | HeapRegion* hr = root_regions->claim_next(); |
tonyp@3464 | 1175 | while (hr != NULL) { |
tonyp@3464 | 1176 | _cm->scanRootRegion(hr, worker_id); |
tonyp@3464 | 1177 | hr = root_regions->claim_next(); |
tonyp@3464 | 1178 | } |
tonyp@3464 | 1179 | } |
tonyp@3464 | 1180 | }; |
tonyp@3464 | 1181 | |
tonyp@3464 | 1182 | void ConcurrentMark::scanRootRegions() { |
tonyp@3464 | 1183 | // scan_in_progress() will have been set to true only if there was |
tonyp@3464 | 1184 | // at least one root region to scan. So, if it's false, we |
tonyp@3464 | 1185 | // should not attempt to do any further work. |
tonyp@3464 | 1186 | if (root_regions()->scan_in_progress()) { |
tonyp@3464 | 1187 | _parallel_marking_threads = calc_parallel_marking_threads(); |
tonyp@3464 | 1188 | assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
tonyp@3464 | 1189 | "Maximum number of marking threads exceeded"); |
tonyp@3464 | 1190 | uint active_workers = MAX2(1U, parallel_marking_threads()); |
tonyp@3464 | 1191 | |
tonyp@3464 | 1192 | CMRootRegionScanTask task(this); |
tonyp@3464 | 1193 | if (parallel_marking_threads() > 0) { |
tonyp@3464 | 1194 | _parallel_workers->set_active_workers((int) active_workers); |
tonyp@3464 | 1195 | _parallel_workers->run_task(&task); |
tonyp@3464 | 1196 | } else { |
tonyp@3464 | 1197 | task.work(0); |
tonyp@3464 | 1198 | } |
tonyp@3464 | 1199 | |
tonyp@3464 | 1200 | // It's possible that has_aborted() is true here without actually |
tonyp@3464 | 1201 | // aborting the survivor scan earlier. This is OK as it's |
tonyp@3464 | 1202 | // mainly used for sanity checking. |
tonyp@3464 | 1203 | root_regions()->scan_finished(); |
tonyp@3464 | 1204 | } |
tonyp@3464 | 1205 | } |
tonyp@3464 | 1206 | |
ysr@777 | 1207 | void ConcurrentMark::markFromRoots() { |
ysr@777 | 1208 | // we might be tempted to assert that: |
ysr@777 | 1209 | // assert(asynch == !SafepointSynchronize::is_at_safepoint(), |
ysr@777 | 1210 | // "inconsistent argument?"); |
ysr@777 | 1211 | // However that wouldn't be right, because it's possible that |
ysr@777 | 1212 | // a safepoint is indeed in progress as a younger generation |
ysr@777 | 1213 | // stop-the-world GC happens even as we mark in this generation. |
ysr@777 | 1214 | |
ysr@777 | 1215 | _restart_for_overflow = false; |
tonyp@2848 | 1216 | force_overflow_conc()->init(); |
jmasa@3294 | 1217 | |
jmasa@3294 | 1218 | // _g1h has _n_par_threads |
jmasa@3294 | 1219 | _parallel_marking_threads = calc_parallel_marking_threads(); |
jmasa@3294 | 1220 | assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
jmasa@3294 | 1221 | "Maximum number of marking threads exceeded"); |
johnc@3338 | 1222 | |
jmasa@3357 | 1223 | uint active_workers = MAX2(1U, parallel_marking_threads()); |
johnc@3338 | 1224 | |
johnc@3338 | 1225 | // Parallel task terminator is set in "set_phase()" |
johnc@3338 | 1226 | set_phase(active_workers, true /* concurrent */); |
ysr@777 | 1227 | |
ysr@777 | 1228 | CMConcurrentMarkingTask markingTask(this, cmThread()); |
tonyp@2973 | 1229 | if (parallel_marking_threads() > 0) { |
johnc@3338 | 1230 | _parallel_workers->set_active_workers((int)active_workers); |
johnc@3338 | 1231 | // Don't set _n_par_threads because it affects MT in proceess_strong_roots() |
johnc@3338 | 1232 | // and the decisions on that MT processing is made elsewhere. |
johnc@3338 | 1233 | assert(_parallel_workers->active_workers() > 0, "Should have been set"); |
ysr@777 | 1234 | _parallel_workers->run_task(&markingTask); |
tonyp@2973 | 1235 | } else { |
ysr@777 | 1236 | markingTask.work(0); |
tonyp@2973 | 1237 | } |
ysr@777 | 1238 | print_stats(); |
ysr@777 | 1239 | } |
ysr@777 | 1240 | |
ysr@777 | 1241 | void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { |
ysr@777 | 1242 | // world is stopped at this checkpoint |
ysr@777 | 1243 | assert(SafepointSynchronize::is_at_safepoint(), |
ysr@777 | 1244 | "world should be stopped"); |
johnc@3175 | 1245 | |
ysr@777 | 1246 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 1247 | |
ysr@777 | 1248 | // If a full collection has happened, we shouldn't do this. |
ysr@777 | 1249 | if (has_aborted()) { |
ysr@777 | 1250 | g1h->set_marking_complete(); // So bitmap clearing isn't confused |
ysr@777 | 1251 | return; |
ysr@777 | 1252 | } |
ysr@777 | 1253 | |
kamg@2445 | 1254 | SvcGCMarker sgcm(SvcGCMarker::OTHER); |
kamg@2445 | 1255 | |
ysr@1280 | 1256 | if (VerifyDuringGC) { |
ysr@1280 | 1257 | HandleMark hm; // handle scope |
ysr@1280 | 1258 | gclog_or_tty->print(" VerifyDuringGC:(before)"); |
ysr@1280 | 1259 | Universe::heap()->prepare_for_verify(); |
johnc@4176 | 1260 | Universe::verify(/* silent */ false, |
johnc@4176 | 1261 | /* option */ VerifyOption_G1UsePrevMarking); |
ysr@1280 | 1262 | } |
ysr@1280 | 1263 | |
ysr@777 | 1264 | G1CollectorPolicy* g1p = g1h->g1_policy(); |
ysr@777 | 1265 | g1p->record_concurrent_mark_remark_start(); |
ysr@777 | 1266 | |
ysr@777 | 1267 | double start = os::elapsedTime(); |
ysr@777 | 1268 | |
ysr@777 | 1269 | checkpointRootsFinalWork(); |
ysr@777 | 1270 | |
ysr@777 | 1271 | double mark_work_end = os::elapsedTime(); |
ysr@777 | 1272 | |
ysr@777 | 1273 | weakRefsWork(clear_all_soft_refs); |
ysr@777 | 1274 | |
ysr@777 | 1275 | if (has_overflown()) { |
ysr@777 | 1276 | // Oops. We overflowed. Restart concurrent marking. |
ysr@777 | 1277 | _restart_for_overflow = true; |
johnc@4386 | 1278 | // Clear the marking state because we will be restarting |
johnc@4386 | 1279 | // marking due to overflowing the global mark stack. |
johnc@4386 | 1280 | reset_marking_state(); |
tonyp@2973 | 1281 | if (G1TraceMarkStackOverflow) { |
ysr@777 | 1282 | gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
tonyp@2973 | 1283 | } |
ysr@777 | 1284 | } else { |
johnc@3463 | 1285 | // Aggregate the per-task counting data that we have accumulated |
johnc@3463 | 1286 | // while marking. |
johnc@3463 | 1287 | aggregate_count_data(); |
johnc@3463 | 1288 | |
tonyp@2469 | 1289 | SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
ysr@777 | 1290 | // We're done with marking. |
tonyp@1752 | 1291 | // This is the end of the marking cycle, we're expected all |
tonyp@1752 | 1292 | // threads to have SATB queues with active set to true. |
tonyp@2469 | 1293 | satb_mq_set.set_active_all_threads(false, /* new active value */ |
tonyp@2469 | 1294 | true /* expected_active */); |
tonyp@1246 | 1295 | |
tonyp@1246 | 1296 | if (VerifyDuringGC) { |
ysr@1280 | 1297 | HandleMark hm; // handle scope |
ysr@1280 | 1298 | gclog_or_tty->print(" VerifyDuringGC:(after)"); |
ysr@1280 | 1299 | Universe::heap()->prepare_for_verify(); |
johnc@4176 | 1300 | Universe::verify(/* silent */ false, |
johnc@4176 | 1301 | /* option */ VerifyOption_G1UseNextMarking); |
tonyp@1246 | 1302 | } |
johnc@2494 | 1303 | assert(!restart_for_overflow(), "sanity"); |
johnc@4386 | 1304 | // Completely reset the marking state since marking completed |
johnc@4386 | 1305 | set_non_marking_state(); |
johnc@2494 | 1306 | } |
johnc@2494 | 1307 | |
johnc@4333 | 1308 | // Expand the marking stack, if we have to and if we can. |
johnc@4333 | 1309 | if (_markStack.should_expand()) { |
johnc@4333 | 1310 | _markStack.expand(); |
johnc@4333 | 1311 | } |
johnc@4333 | 1312 | |
ysr@777 | 1313 | #if VERIFY_OBJS_PROCESSED |
ysr@777 | 1314 | _scan_obj_cl.objs_processed = 0; |
ysr@777 | 1315 | ThreadLocalObjQueue::objs_enqueued = 0; |
ysr@777 | 1316 | #endif |
ysr@777 | 1317 | |
ysr@777 | 1318 | // Statistics |
ysr@777 | 1319 | double now = os::elapsedTime(); |
ysr@777 | 1320 | _remark_mark_times.add((mark_work_end - start) * 1000.0); |
ysr@777 | 1321 | _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); |
ysr@777 | 1322 | _remark_times.add((now - start) * 1000.0); |
ysr@777 | 1323 | |
ysr@777 | 1324 | g1p->record_concurrent_mark_remark_end(); |
ysr@777 | 1325 | } |
ysr@777 | 1326 | |
johnc@3731 | 1327 | // Base class of the closures that finalize and verify the |
johnc@3731 | 1328 | // liveness counting data. |
johnc@3731 | 1329 | class CMCountDataClosureBase: public HeapRegionClosure { |
johnc@3731 | 1330 | protected: |
johnc@4123 | 1331 | G1CollectedHeap* _g1h; |
ysr@777 | 1332 | ConcurrentMark* _cm; |
johnc@4123 | 1333 | CardTableModRefBS* _ct_bs; |
johnc@4123 | 1334 | |
johnc@3463 | 1335 | BitMap* _region_bm; |
johnc@3463 | 1336 | BitMap* _card_bm; |
johnc@3463 | 1337 | |
johnc@4123 | 1338 | // Takes a region that's not empty (i.e., it has at least one |
tonyp@1264 | 1339 | // live object in it and sets its corresponding bit on the region |
tonyp@1264 | 1340 | // bitmap to 1. If the region is "starts humongous" it will also set |
tonyp@1264 | 1341 | // to 1 the bits on the region bitmap that correspond to its |
tonyp@1264 | 1342 | // associated "continues humongous" regions. |
tonyp@1264 | 1343 | void set_bit_for_region(HeapRegion* hr) { |
tonyp@1264 | 1344 | assert(!hr->continuesHumongous(), "should have filtered those out"); |
tonyp@1264 | 1345 | |
tonyp@3713 | 1346 | BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
tonyp@1264 | 1347 | if (!hr->startsHumongous()) { |
tonyp@1264 | 1348 | // Normal (non-humongous) case: just set the bit. |
tonyp@3713 | 1349 | _region_bm->par_at_put(index, true); |
tonyp@1264 | 1350 | } else { |
tonyp@1264 | 1351 | // Starts humongous case: calculate how many regions are part of |
johnc@3463 | 1352 | // this humongous region and then set the bit range. |
tonyp@3957 | 1353 | BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
tonyp@3713 | 1354 | _region_bm->par_at_put_range(index, end_index, true); |
tonyp@1264 | 1355 | } |
tonyp@1264 | 1356 | } |
tonyp@1264 | 1357 | |
johnc@3731 | 1358 | public: |
johnc@4123 | 1359 | CMCountDataClosureBase(G1CollectedHeap* g1h, |
johnc@3731 | 1360 | BitMap* region_bm, BitMap* card_bm): |
johnc@4123 | 1361 | _g1h(g1h), _cm(g1h->concurrent_mark()), |
johnc@4123 | 1362 | _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
johnc@4123 | 1363 | _region_bm(region_bm), _card_bm(card_bm) { } |
johnc@3731 | 1364 | }; |
johnc@3731 | 1365 | |
johnc@3731 | 1366 | // Closure that calculates the # live objects per region. Used |
johnc@3731 | 1367 | // for verification purposes during the cleanup pause. |
johnc@3731 | 1368 | class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
johnc@3731 | 1369 | CMBitMapRO* _bm; |
johnc@3731 | 1370 | size_t _region_marked_bytes; |
johnc@3731 | 1371 | |
johnc@3731 | 1372 | public: |
johnc@4123 | 1373 | CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
johnc@3731 | 1374 | BitMap* region_bm, BitMap* card_bm) : |
johnc@4123 | 1375 | CMCountDataClosureBase(g1h, region_bm, card_bm), |
johnc@3731 | 1376 | _bm(bm), _region_marked_bytes(0) { } |
johnc@3731 | 1377 | |
ysr@777 | 1378 | bool doHeapRegion(HeapRegion* hr) { |
ysr@777 | 1379 | |
iveresov@1074 | 1380 | if (hr->continuesHumongous()) { |
tonyp@1264 | 1381 | // We will ignore these here and process them when their |
tonyp@1264 | 1382 | // associated "starts humongous" region is processed (see |
tonyp@1264 | 1383 | // set_bit_for_heap_region()). Note that we cannot rely on their |
tonyp@1264 | 1384 | // associated "starts humongous" region to have their bit set to |
tonyp@1264 | 1385 | // 1 since, due to the region chunking in the parallel region |
tonyp@1264 | 1386 | // iteration, a "continues humongous" region might be visited |
tonyp@1264 | 1387 | // before its associated "starts humongous". |
iveresov@1074 | 1388 | return false; |
iveresov@1074 | 1389 | } |
ysr@777 | 1390 | |
johnc@4123 | 1391 | HeapWord* ntams = hr->next_top_at_mark_start(); |
johnc@4123 | 1392 | HeapWord* start = hr->bottom(); |
johnc@4123 | 1393 | |
johnc@4123 | 1394 | assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
johnc@3463 | 1395 | err_msg("Preconditions not met - " |
johnc@4123 | 1396 | "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
johnc@4123 | 1397 | start, ntams, hr->end())); |
johnc@3463 | 1398 | |
ysr@777 | 1399 | // Find the first marked object at or after "start". |
johnc@4123 | 1400 | start = _bm->getNextMarkedWordAddress(start, ntams); |
johnc@3463 | 1401 | |
ysr@777 | 1402 | size_t marked_bytes = 0; |
ysr@777 | 1403 | |
johnc@4123 | 1404 | while (start < ntams) { |
ysr@777 | 1405 | oop obj = oop(start); |
ysr@777 | 1406 | int obj_sz = obj->size(); |
johnc@4123 | 1407 | HeapWord* obj_end = start + obj_sz; |
johnc@3731 | 1408 | |
johnc@3731 | 1409 | BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
johnc@4123 | 1410 | BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
johnc@4123 | 1411 | |
johnc@4123 | 1412 | // Note: if we're looking at the last region in heap - obj_end |
johnc@4123 | 1413 | // could be actually just beyond the end of the heap; end_idx |
johnc@4123 | 1414 | // will then correspond to a (non-existent) card that is also |
johnc@4123 | 1415 | // just beyond the heap. |
johnc@4123 | 1416 | if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
johnc@4123 | 1417 | // end of object is not card aligned - increment to cover |
johnc@4123 | 1418 | // all the cards spanned by the object |
johnc@4123 | 1419 | end_idx += 1; |
johnc@4123 | 1420 | } |
johnc@4123 | 1421 | |
johnc@4123 | 1422 | // Set the bits in the card BM for the cards spanned by this object. |
johnc@4123 | 1423 | _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
johnc@3731 | 1424 | |
johnc@3731 | 1425 | // Add the size of this object to the number of marked bytes. |
apetrusenko@1465 | 1426 | marked_bytes += (size_t)obj_sz * HeapWordSize; |
johnc@3463 | 1427 | |
ysr@777 | 1428 | // Find the next marked object after this one. |
johnc@4123 | 1429 | start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
tonyp@2973 | 1430 | } |
johnc@3463 | 1431 | |
johnc@3463 | 1432 | // Mark the allocated-since-marking portion... |
johnc@3463 | 1433 | HeapWord* top = hr->top(); |
johnc@4123 | 1434 | if (ntams < top) { |
johnc@4123 | 1435 | BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
johnc@4123 | 1436 | BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
johnc@4123 | 1437 | |
johnc@4123 | 1438 | // Note: if we're looking at the last region in heap - top |
johnc@4123 | 1439 | // could be actually just beyond the end of the heap; end_idx |
johnc@4123 | 1440 | // will then correspond to a (non-existent) card that is also |
johnc@4123 | 1441 | // just beyond the heap. |
johnc@4123 | 1442 | if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
johnc@4123 | 1443 | // end of object is not card aligned - increment to cover |
johnc@4123 | 1444 | // all the cards spanned by the object |
johnc@4123 | 1445 | end_idx += 1; |
johnc@4123 | 1446 | } |
johnc@4123 | 1447 | _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
johnc@3463 | 1448 | |
johnc@3463 | 1449 | // This definitely means the region has live objects. |
johnc@3463 | 1450 | set_bit_for_region(hr); |
ysr@777 | 1451 | } |
ysr@777 | 1452 | |
ysr@777 | 1453 | // Update the live region bitmap. |
ysr@777 | 1454 | if (marked_bytes > 0) { |
tonyp@1264 | 1455 | set_bit_for_region(hr); |
ysr@777 | 1456 | } |
johnc@3463 | 1457 | |
johnc@3463 | 1458 | // Set the marked bytes for the current region so that |
johnc@3463 | 1459 | // it can be queried by a calling verificiation routine |
johnc@3463 | 1460 | _region_marked_bytes = marked_bytes; |
johnc@3463 | 1461 | |
johnc@3463 | 1462 | return false; |
johnc@3463 | 1463 | } |
johnc@3463 | 1464 | |
johnc@3463 | 1465 | size_t region_marked_bytes() const { return _region_marked_bytes; } |
johnc@3463 | 1466 | }; |
johnc@3463 | 1467 | |
johnc@3463 | 1468 | // Heap region closure used for verifying the counting data |
johnc@3463 | 1469 | // that was accumulated concurrently and aggregated during |
johnc@3463 | 1470 | // the remark pause. This closure is applied to the heap |
johnc@3463 | 1471 | // regions during the STW cleanup pause. |
johnc@3463 | 1472 | |
johnc@3463 | 1473 | class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
johnc@4123 | 1474 | G1CollectedHeap* _g1h; |
johnc@3463 | 1475 | ConcurrentMark* _cm; |
johnc@3463 | 1476 | CalcLiveObjectsClosure _calc_cl; |
johnc@3463 | 1477 | BitMap* _region_bm; // Region BM to be verified |
johnc@3463 | 1478 | BitMap* _card_bm; // Card BM to be verified |
johnc@3463 | 1479 | bool _verbose; // verbose output? |
johnc@3463 | 1480 | |
johnc@3463 | 1481 | BitMap* _exp_region_bm; // Expected Region BM values |
johnc@3463 | 1482 | BitMap* _exp_card_bm; // Expected card BM values |
johnc@3463 | 1483 | |
johnc@3463 | 1484 | int _failures; |
johnc@3463 | 1485 | |
johnc@3463 | 1486 | public: |
johnc@4123 | 1487 | VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
johnc@3463 | 1488 | BitMap* region_bm, |
johnc@3463 | 1489 | BitMap* card_bm, |
johnc@3463 | 1490 | BitMap* exp_region_bm, |
johnc@3463 | 1491 | BitMap* exp_card_bm, |
johnc@3463 | 1492 | bool verbose) : |
johnc@4123 | 1493 | _g1h(g1h), _cm(g1h->concurrent_mark()), |
johnc@4123 | 1494 | _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
johnc@3463 | 1495 | _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
johnc@3463 | 1496 | _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
johnc@3463 | 1497 | _failures(0) { } |
johnc@3463 | 1498 | |
johnc@3463 | 1499 | int failures() const { return _failures; } |
johnc@3463 | 1500 | |
johnc@3463 | 1501 | bool doHeapRegion(HeapRegion* hr) { |
johnc@3463 | 1502 | if (hr->continuesHumongous()) { |
johnc@3463 | 1503 | // We will ignore these here and process them when their |
johnc@3463 | 1504 | // associated "starts humongous" region is processed (see |
johnc@3463 | 1505 | // set_bit_for_heap_region()). Note that we cannot rely on their |
johnc@3463 | 1506 | // associated "starts humongous" region to have their bit set to |
johnc@3463 | 1507 | // 1 since, due to the region chunking in the parallel region |
johnc@3463 | 1508 | // iteration, a "continues humongous" region might be visited |
johnc@3463 | 1509 | // before its associated "starts humongous". |
johnc@3463 | 1510 | return false; |
johnc@3463 | 1511 | } |
johnc@3463 | 1512 | |
johnc@3463 | 1513 | int failures = 0; |
johnc@3463 | 1514 | |
johnc@3463 | 1515 | // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
johnc@3463 | 1516 | // this region and set the corresponding bits in the expected region |
johnc@3463 | 1517 | // and card bitmaps. |
johnc@3463 | 1518 | bool res = _calc_cl.doHeapRegion(hr); |
johnc@3463 | 1519 | assert(res == false, "should be continuing"); |
johnc@3463 | 1520 | |
johnc@3463 | 1521 | MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
johnc@3463 | 1522 | Mutex::_no_safepoint_check_flag); |
johnc@3463 | 1523 | |
johnc@3463 | 1524 | // Verify the marked bytes for this region. |
johnc@3463 | 1525 | size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
johnc@3463 | 1526 | size_t act_marked_bytes = hr->next_marked_bytes(); |
johnc@3463 | 1527 | |
johnc@3463 | 1528 | // We're not OK if expected marked bytes > actual marked bytes. It means |
johnc@3463 | 1529 | // we have missed accounting some objects during the actual marking. |
johnc@3463 | 1530 | if (exp_marked_bytes > act_marked_bytes) { |
johnc@3463 | 1531 | if (_verbose) { |
tonyp@3713 | 1532 | gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
johnc@3463 | 1533 | "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
johnc@3463 | 1534 | hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
johnc@3463 | 1535 | } |
johnc@3463 | 1536 | failures += 1; |
johnc@3463 | 1537 | } |
johnc@3463 | 1538 | |
johnc@3463 | 1539 | // Verify the bit, for this region, in the actual and expected |
johnc@3463 | 1540 | // (which was just calculated) region bit maps. |
johnc@3463 | 1541 | // We're not OK if the bit in the calculated expected region |
johnc@3463 | 1542 | // bitmap is set and the bit in the actual region bitmap is not. |
tonyp@3713 | 1543 | BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
johnc@3463 | 1544 | |
johnc@3463 | 1545 | bool expected = _exp_region_bm->at(index); |
johnc@3463 | 1546 | bool actual = _region_bm->at(index); |
johnc@3463 | 1547 | if (expected && !actual) { |
johnc@3463 | 1548 | if (_verbose) { |
tonyp@3713 | 1549 | gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
tonyp@3713 | 1550 | "expected: %s, actual: %s", |
tonyp@3713 | 1551 | hr->hrs_index(), |
tonyp@3713 | 1552 | BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
johnc@3463 | 1553 | } |
johnc@3463 | 1554 | failures += 1; |
johnc@3463 | 1555 | } |
johnc@3463 | 1556 | |
johnc@3463 | 1557 | // Verify that the card bit maps for the cards spanned by the current |
johnc@3463 | 1558 | // region match. We have an error if we have a set bit in the expected |
johnc@3463 | 1559 | // bit map and the corresponding bit in the actual bitmap is not set. |
johnc@3463 | 1560 | |
johnc@3463 | 1561 | BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
johnc@3463 | 1562 | BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
johnc@3463 | 1563 | |
johnc@3463 | 1564 | for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
johnc@3463 | 1565 | expected = _exp_card_bm->at(i); |
johnc@3463 | 1566 | actual = _card_bm->at(i); |
johnc@3463 | 1567 | |
johnc@3463 | 1568 | if (expected && !actual) { |
johnc@3463 | 1569 | if (_verbose) { |
tonyp@3713 | 1570 | gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
tonyp@3713 | 1571 | "expected: %s, actual: %s", |
tonyp@3713 | 1572 | hr->hrs_index(), i, |
tonyp@3713 | 1573 | BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
ysr@777 | 1574 | } |
johnc@3463 | 1575 | failures += 1; |
ysr@777 | 1576 | } |
ysr@777 | 1577 | } |
ysr@777 | 1578 | |
johnc@3463 | 1579 | if (failures > 0 && _verbose) { |
johnc@3463 | 1580 | gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
johnc@3463 | 1581 | "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
johnc@3463 | 1582 | HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
johnc@3463 | 1583 | _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
johnc@3463 | 1584 | } |
johnc@3463 | 1585 | |
johnc@3463 | 1586 | _failures += failures; |
johnc@3463 | 1587 | |
johnc@3463 | 1588 | // We could stop iteration over the heap when we |
johnc@3731 | 1589 | // find the first violating region by returning true. |
ysr@777 | 1590 | return false; |
ysr@777 | 1591 | } |
ysr@777 | 1592 | }; |
ysr@777 | 1593 | |
ysr@777 | 1594 | |
johnc@3463 | 1595 | class G1ParVerifyFinalCountTask: public AbstractGangTask { |
johnc@3463 | 1596 | protected: |
johnc@3463 | 1597 | G1CollectedHeap* _g1h; |
johnc@3463 | 1598 | ConcurrentMark* _cm; |
johnc@3463 | 1599 | BitMap* _actual_region_bm; |
johnc@3463 | 1600 | BitMap* _actual_card_bm; |
johnc@3463 | 1601 | |
johnc@3463 | 1602 | uint _n_workers; |
johnc@3463 | 1603 | |
johnc@3463 | 1604 | BitMap* _expected_region_bm; |
johnc@3463 | 1605 | BitMap* _expected_card_bm; |
johnc@3463 | 1606 | |
johnc@3463 | 1607 | int _failures; |
johnc@3463 | 1608 | bool _verbose; |
johnc@3463 | 1609 | |
johnc@3463 | 1610 | public: |
johnc@3463 | 1611 | G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
johnc@3463 | 1612 | BitMap* region_bm, BitMap* card_bm, |
johnc@3463 | 1613 | BitMap* expected_region_bm, BitMap* expected_card_bm) |
johnc@3463 | 1614 | : AbstractGangTask("G1 verify final counting"), |
johnc@3463 | 1615 | _g1h(g1h), _cm(_g1h->concurrent_mark()), |
johnc@3463 | 1616 | _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
johnc@3463 | 1617 | _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
johnc@3463 | 1618 | _failures(0), _verbose(false), |
johnc@3463 | 1619 | _n_workers(0) { |
johnc@3463 | 1620 | assert(VerifyDuringGC, "don't call this otherwise"); |
johnc@3463 | 1621 | |
johnc@3463 | 1622 | // Use the value already set as the number of active threads |
johnc@3463 | 1623 | // in the call to run_task(). |
johnc@3463 | 1624 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@3463 | 1625 | assert( _g1h->workers()->active_workers() > 0, |
johnc@3463 | 1626 | "Should have been previously set"); |
johnc@3463 | 1627 | _n_workers = _g1h->workers()->active_workers(); |
johnc@3463 | 1628 | } else { |
johnc@3463 | 1629 | _n_workers = 1; |
johnc@3463 | 1630 | } |
johnc@3463 | 1631 | |
johnc@3463 | 1632 | assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
johnc@3463 | 1633 | assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
johnc@3463 | 1634 | |
johnc@3463 | 1635 | _verbose = _cm->verbose_medium(); |
johnc@3463 | 1636 | } |
johnc@3463 | 1637 | |
johnc@3463 | 1638 | void work(uint worker_id) { |
johnc@3463 | 1639 | assert(worker_id < _n_workers, "invariant"); |
johnc@3463 | 1640 | |
johnc@4123 | 1641 | VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
johnc@3463 | 1642 | _actual_region_bm, _actual_card_bm, |
johnc@3463 | 1643 | _expected_region_bm, |
johnc@3463 | 1644 | _expected_card_bm, |
johnc@3463 | 1645 | _verbose); |
johnc@3463 | 1646 | |
johnc@3463 | 1647 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@3463 | 1648 | _g1h->heap_region_par_iterate_chunked(&verify_cl, |
johnc@3463 | 1649 | worker_id, |
johnc@3463 | 1650 | _n_workers, |
johnc@3463 | 1651 | HeapRegion::VerifyCountClaimValue); |
johnc@3463 | 1652 | } else { |
johnc@3463 | 1653 | _g1h->heap_region_iterate(&verify_cl); |
johnc@3463 | 1654 | } |
johnc@3463 | 1655 | |
johnc@3463 | 1656 | Atomic::add(verify_cl.failures(), &_failures); |
johnc@3463 | 1657 | } |
johnc@3463 | 1658 | |
johnc@3463 | 1659 | int failures() const { return _failures; } |
johnc@3463 | 1660 | }; |
johnc@3463 | 1661 | |
johnc@3731 | 1662 | // Closure that finalizes the liveness counting data. |
johnc@3731 | 1663 | // Used during the cleanup pause. |
johnc@3731 | 1664 | // Sets the bits corresponding to the interval [NTAMS, top] |
johnc@3731 | 1665 | // (which contains the implicitly live objects) in the |
johnc@3731 | 1666 | // card liveness bitmap. Also sets the bit for each region, |
johnc@3731 | 1667 | // containing live data, in the region liveness bitmap. |
johnc@3731 | 1668 | |
johnc@3731 | 1669 | class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
johnc@3463 | 1670 | public: |
johnc@4123 | 1671 | FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
johnc@3463 | 1672 | BitMap* region_bm, |
johnc@3463 | 1673 | BitMap* card_bm) : |
johnc@4123 | 1674 | CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
johnc@3463 | 1675 | |
johnc@3463 | 1676 | bool doHeapRegion(HeapRegion* hr) { |
johnc@3463 | 1677 | |
johnc@3463 | 1678 | if (hr->continuesHumongous()) { |
johnc@3463 | 1679 | // We will ignore these here and process them when their |
johnc@3463 | 1680 | // associated "starts humongous" region is processed (see |
johnc@3463 | 1681 | // set_bit_for_heap_region()). Note that we cannot rely on their |
johnc@3463 | 1682 | // associated "starts humongous" region to have their bit set to |
johnc@3463 | 1683 | // 1 since, due to the region chunking in the parallel region |
johnc@3463 | 1684 | // iteration, a "continues humongous" region might be visited |
johnc@3463 | 1685 | // before its associated "starts humongous". |
johnc@3463 | 1686 | return false; |
johnc@3463 | 1687 | } |
johnc@3463 | 1688 | |
johnc@3463 | 1689 | HeapWord* ntams = hr->next_top_at_mark_start(); |
johnc@3463 | 1690 | HeapWord* top = hr->top(); |
johnc@3463 | 1691 | |
johnc@3731 | 1692 | assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
johnc@3463 | 1693 | |
johnc@3463 | 1694 | // Mark the allocated-since-marking portion... |
johnc@3463 | 1695 | if (ntams < top) { |
johnc@3463 | 1696 | // This definitely means the region has live objects. |
johnc@3463 | 1697 | set_bit_for_region(hr); |
johnc@4123 | 1698 | |
johnc@4123 | 1699 | // Now set the bits in the card bitmap for [ntams, top) |
johnc@4123 | 1700 | BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
johnc@4123 | 1701 | BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
johnc@4123 | 1702 | |
johnc@4123 | 1703 | // Note: if we're looking at the last region in heap - top |
johnc@4123 | 1704 | // could be actually just beyond the end of the heap; end_idx |
johnc@4123 | 1705 | // will then correspond to a (non-existent) card that is also |
johnc@4123 | 1706 | // just beyond the heap. |
johnc@4123 | 1707 | if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
johnc@4123 | 1708 | // end of object is not card aligned - increment to cover |
johnc@4123 | 1709 | // all the cards spanned by the object |
johnc@4123 | 1710 | end_idx += 1; |
johnc@4123 | 1711 | } |
johnc@4123 | 1712 | |
johnc@4123 | 1713 | assert(end_idx <= _card_bm->size(), |
johnc@4123 | 1714 | err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
johnc@4123 | 1715 | end_idx, _card_bm->size())); |
johnc@4123 | 1716 | assert(start_idx < _card_bm->size(), |
johnc@4123 | 1717 | err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
johnc@4123 | 1718 | start_idx, _card_bm->size())); |
johnc@4123 | 1719 | |
johnc@4123 | 1720 | _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
coleenp@4037 | 1721 | } |
johnc@3463 | 1722 | |
johnc@3463 | 1723 | // Set the bit for the region if it contains live data |
johnc@3463 | 1724 | if (hr->next_marked_bytes() > 0) { |
johnc@3463 | 1725 | set_bit_for_region(hr); |
johnc@3463 | 1726 | } |
johnc@3463 | 1727 | |
johnc@3463 | 1728 | return false; |
johnc@3463 | 1729 | } |
johnc@3463 | 1730 | }; |
ysr@777 | 1731 | |
ysr@777 | 1732 | class G1ParFinalCountTask: public AbstractGangTask { |
ysr@777 | 1733 | protected: |
ysr@777 | 1734 | G1CollectedHeap* _g1h; |
johnc@3463 | 1735 | ConcurrentMark* _cm; |
johnc@3463 | 1736 | BitMap* _actual_region_bm; |
johnc@3463 | 1737 | BitMap* _actual_card_bm; |
johnc@3463 | 1738 | |
jmasa@3357 | 1739 | uint _n_workers; |
johnc@3463 | 1740 | |
ysr@777 | 1741 | public: |
johnc@3463 | 1742 | G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
johnc@3463 | 1743 | : AbstractGangTask("G1 final counting"), |
johnc@3463 | 1744 | _g1h(g1h), _cm(_g1h->concurrent_mark()), |
johnc@3463 | 1745 | _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
johnc@3463 | 1746 | _n_workers(0) { |
jmasa@3294 | 1747 | // Use the value already set as the number of active threads |
tonyp@3714 | 1748 | // in the call to run_task(). |
jmasa@3294 | 1749 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
jmasa@3294 | 1750 | assert( _g1h->workers()->active_workers() > 0, |
jmasa@3294 | 1751 | "Should have been previously set"); |
jmasa@3294 | 1752 | _n_workers = _g1h->workers()->active_workers(); |
tonyp@2973 | 1753 | } else { |
ysr@777 | 1754 | _n_workers = 1; |
tonyp@2973 | 1755 | } |
ysr@777 | 1756 | } |
ysr@777 | 1757 | |
jmasa@3357 | 1758 | void work(uint worker_id) { |
johnc@3463 | 1759 | assert(worker_id < _n_workers, "invariant"); |
johnc@3463 | 1760 | |
johnc@4123 | 1761 | FinalCountDataUpdateClosure final_update_cl(_g1h, |
johnc@3463 | 1762 | _actual_region_bm, |
johnc@3463 | 1763 | _actual_card_bm); |
johnc@3463 | 1764 | |
jmasa@2188 | 1765 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@3463 | 1766 | _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
johnc@3463 | 1767 | worker_id, |
johnc@3463 | 1768 | _n_workers, |
tonyp@790 | 1769 | HeapRegion::FinalCountClaimValue); |
ysr@777 | 1770 | } else { |
johnc@3463 | 1771 | _g1h->heap_region_iterate(&final_update_cl); |
ysr@777 | 1772 | } |
ysr@777 | 1773 | } |
ysr@777 | 1774 | }; |
ysr@777 | 1775 | |
ysr@777 | 1776 | class G1ParNoteEndTask; |
ysr@777 | 1777 | |
ysr@777 | 1778 | class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { |
ysr@777 | 1779 | G1CollectedHeap* _g1; |
ysr@777 | 1780 | int _worker_num; |
ysr@777 | 1781 | size_t _max_live_bytes; |
tonyp@3713 | 1782 | uint _regions_claimed; |
ysr@777 | 1783 | size_t _freed_bytes; |
tonyp@2493 | 1784 | FreeRegionList* _local_cleanup_list; |
tonyp@3268 | 1785 | OldRegionSet* _old_proxy_set; |
tonyp@2493 | 1786 | HumongousRegionSet* _humongous_proxy_set; |
tonyp@2493 | 1787 | HRRSCleanupTask* _hrrs_cleanup_task; |
ysr@777 | 1788 | double _claimed_region_time; |
ysr@777 | 1789 | double _max_region_time; |
ysr@777 | 1790 | |
ysr@777 | 1791 | public: |
ysr@777 | 1792 | G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, |
tonyp@2493 | 1793 | int worker_num, |
tonyp@2493 | 1794 | FreeRegionList* local_cleanup_list, |
tonyp@3268 | 1795 | OldRegionSet* old_proxy_set, |
tonyp@2493 | 1796 | HumongousRegionSet* humongous_proxy_set, |
johnc@3292 | 1797 | HRRSCleanupTask* hrrs_cleanup_task) : |
johnc@3292 | 1798 | _g1(g1), _worker_num(worker_num), |
johnc@3292 | 1799 | _max_live_bytes(0), _regions_claimed(0), |
johnc@3292 | 1800 | _freed_bytes(0), |
johnc@3292 | 1801 | _claimed_region_time(0.0), _max_region_time(0.0), |
johnc@3292 | 1802 | _local_cleanup_list(local_cleanup_list), |
johnc@3292 | 1803 | _old_proxy_set(old_proxy_set), |
johnc@3292 | 1804 | _humongous_proxy_set(humongous_proxy_set), |
johnc@3292 | 1805 | _hrrs_cleanup_task(hrrs_cleanup_task) { } |
johnc@3292 | 1806 | |
ysr@777 | 1807 | size_t freed_bytes() { return _freed_bytes; } |
ysr@777 | 1808 | |
johnc@3292 | 1809 | bool doHeapRegion(HeapRegion *hr) { |
tonyp@3957 | 1810 | if (hr->continuesHumongous()) { |
tonyp@3957 | 1811 | return false; |
tonyp@3957 | 1812 | } |
johnc@3292 | 1813 | // We use a claim value of zero here because all regions |
johnc@3292 | 1814 | // were claimed with value 1 in the FinalCount task. |
tonyp@3957 | 1815 | _g1->reset_gc_time_stamps(hr); |
tonyp@3957 | 1816 | double start = os::elapsedTime(); |
tonyp@3957 | 1817 | _regions_claimed++; |
tonyp@3957 | 1818 | hr->note_end_of_marking(); |
tonyp@3957 | 1819 | _max_live_bytes += hr->max_live_bytes(); |
tonyp@3957 | 1820 | _g1->free_region_if_empty(hr, |
tonyp@3957 | 1821 | &_freed_bytes, |
tonyp@3957 | 1822 | _local_cleanup_list, |
tonyp@3957 | 1823 | _old_proxy_set, |
tonyp@3957 | 1824 | _humongous_proxy_set, |
tonyp@3957 | 1825 | _hrrs_cleanup_task, |
tonyp@3957 | 1826 | true /* par */); |
tonyp@3957 | 1827 | double region_time = (os::elapsedTime() - start); |
tonyp@3957 | 1828 | _claimed_region_time += region_time; |
tonyp@3957 | 1829 | if (region_time > _max_region_time) { |
tonyp@3957 | 1830 | _max_region_time = region_time; |
johnc@3292 | 1831 | } |
johnc@3292 | 1832 | return false; |
johnc@3292 | 1833 | } |
ysr@777 | 1834 | |
ysr@777 | 1835 | size_t max_live_bytes() { return _max_live_bytes; } |
tonyp@3713 | 1836 | uint regions_claimed() { return _regions_claimed; } |
ysr@777 | 1837 | double claimed_region_time_sec() { return _claimed_region_time; } |
ysr@777 | 1838 | double max_region_time_sec() { return _max_region_time; } |
ysr@777 | 1839 | }; |
ysr@777 | 1840 | |
ysr@777 | 1841 | class G1ParNoteEndTask: public AbstractGangTask { |
ysr@777 | 1842 | friend class G1NoteEndOfConcMarkClosure; |
tonyp@2472 | 1843 | |
ysr@777 | 1844 | protected: |
ysr@777 | 1845 | G1CollectedHeap* _g1h; |
ysr@777 | 1846 | size_t _max_live_bytes; |
ysr@777 | 1847 | size_t _freed_bytes; |
tonyp@2472 | 1848 | FreeRegionList* _cleanup_list; |
tonyp@2472 | 1849 | |
ysr@777 | 1850 | public: |
ysr@777 | 1851 | G1ParNoteEndTask(G1CollectedHeap* g1h, |
tonyp@2472 | 1852 | FreeRegionList* cleanup_list) : |
ysr@777 | 1853 | AbstractGangTask("G1 note end"), _g1h(g1h), |
tonyp@2472 | 1854 | _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
ysr@777 | 1855 | |
jmasa@3357 | 1856 | void work(uint worker_id) { |
ysr@777 | 1857 | double start = os::elapsedTime(); |
tonyp@2493 | 1858 | FreeRegionList local_cleanup_list("Local Cleanup List"); |
tonyp@3268 | 1859 | OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
tonyp@2493 | 1860 | HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
tonyp@2493 | 1861 | HRRSCleanupTask hrrs_cleanup_task; |
jmasa@3357 | 1862 | G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
tonyp@3268 | 1863 | &old_proxy_set, |
tonyp@2493 | 1864 | &humongous_proxy_set, |
tonyp@2493 | 1865 | &hrrs_cleanup_task); |
jmasa@2188 | 1866 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
jmasa@3357 | 1867 | _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
jmasa@3294 | 1868 | _g1h->workers()->active_workers(), |
tonyp@790 | 1869 | HeapRegion::NoteEndClaimValue); |
ysr@777 | 1870 | } else { |
ysr@777 | 1871 | _g1h->heap_region_iterate(&g1_note_end); |
ysr@777 | 1872 | } |
ysr@777 | 1873 | assert(g1_note_end.complete(), "Shouldn't have yielded!"); |
ysr@777 | 1874 | |
tonyp@2472 | 1875 | // Now update the lists |
tonyp@2472 | 1876 | _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), |
tonyp@2472 | 1877 | NULL /* free_list */, |
tonyp@3268 | 1878 | &old_proxy_set, |
tonyp@2493 | 1879 | &humongous_proxy_set, |
tonyp@2472 | 1880 | true /* par */); |
ysr@777 | 1881 | { |
ysr@777 | 1882 | MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); |
ysr@777 | 1883 | _max_live_bytes += g1_note_end.max_live_bytes(); |
ysr@777 | 1884 | _freed_bytes += g1_note_end.freed_bytes(); |
tonyp@2472 | 1885 | |
tonyp@2975 | 1886 | // If we iterate over the global cleanup list at the end of |
tonyp@2975 | 1887 | // cleanup to do this printing we will not guarantee to only |
tonyp@2975 | 1888 | // generate output for the newly-reclaimed regions (the list |
tonyp@2975 | 1889 | // might not be empty at the beginning of cleanup; we might |
tonyp@2975 | 1890 | // still be working on its previous contents). So we do the |
tonyp@2975 | 1891 | // printing here, before we append the new regions to the global |
tonyp@2975 | 1892 | // cleanup list. |
tonyp@2975 | 1893 | |
tonyp@2975 | 1894 | G1HRPrinter* hr_printer = _g1h->hr_printer(); |
tonyp@2975 | 1895 | if (hr_printer->is_active()) { |
tonyp@2975 | 1896 | HeapRegionLinkedListIterator iter(&local_cleanup_list); |
tonyp@2975 | 1897 | while (iter.more_available()) { |
tonyp@2975 | 1898 | HeapRegion* hr = iter.get_next(); |
tonyp@2975 | 1899 | hr_printer->cleanup(hr); |
tonyp@2975 | 1900 | } |
tonyp@2975 | 1901 | } |
tonyp@2975 | 1902 | |
tonyp@2493 | 1903 | _cleanup_list->add_as_tail(&local_cleanup_list); |
tonyp@2493 | 1904 | assert(local_cleanup_list.is_empty(), "post-condition"); |
tonyp@2493 | 1905 | |
tonyp@2493 | 1906 | HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); |
ysr@777 | 1907 | } |
ysr@777 | 1908 | } |
ysr@777 | 1909 | size_t max_live_bytes() { return _max_live_bytes; } |
ysr@777 | 1910 | size_t freed_bytes() { return _freed_bytes; } |
ysr@777 | 1911 | }; |
ysr@777 | 1912 | |
ysr@777 | 1913 | class G1ParScrubRemSetTask: public AbstractGangTask { |
ysr@777 | 1914 | protected: |
ysr@777 | 1915 | G1RemSet* _g1rs; |
ysr@777 | 1916 | BitMap* _region_bm; |
ysr@777 | 1917 | BitMap* _card_bm; |
ysr@777 | 1918 | public: |
ysr@777 | 1919 | G1ParScrubRemSetTask(G1CollectedHeap* g1h, |
ysr@777 | 1920 | BitMap* region_bm, BitMap* card_bm) : |
ysr@777 | 1921 | AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), |
johnc@3463 | 1922 | _region_bm(region_bm), _card_bm(card_bm) { } |
ysr@777 | 1923 | |
jmasa@3357 | 1924 | void work(uint worker_id) { |
jmasa@2188 | 1925 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
jmasa@3357 | 1926 | _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
tonyp@790 | 1927 | HeapRegion::ScrubRemSetClaimValue); |
ysr@777 | 1928 | } else { |
ysr@777 | 1929 | _g1rs->scrub(_region_bm, _card_bm); |
ysr@777 | 1930 | } |
ysr@777 | 1931 | } |
ysr@777 | 1932 | |
ysr@777 | 1933 | }; |
ysr@777 | 1934 | |
ysr@777 | 1935 | void ConcurrentMark::cleanup() { |
ysr@777 | 1936 | // world is stopped at this checkpoint |
ysr@777 | 1937 | assert(SafepointSynchronize::is_at_safepoint(), |
ysr@777 | 1938 | "world should be stopped"); |
ysr@777 | 1939 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 1940 | |
ysr@777 | 1941 | // If a full collection has happened, we shouldn't do this. |
ysr@777 | 1942 | if (has_aborted()) { |
ysr@777 | 1943 | g1h->set_marking_complete(); // So bitmap clearing isn't confused |
ysr@777 | 1944 | return; |
ysr@777 | 1945 | } |
ysr@777 | 1946 | |
tonyp@3268 | 1947 | HRSPhaseSetter x(HRSPhaseCleanup); |
tonyp@2472 | 1948 | g1h->verify_region_sets_optional(); |
tonyp@2472 | 1949 | |
ysr@1280 | 1950 | if (VerifyDuringGC) { |
ysr@1280 | 1951 | HandleMark hm; // handle scope |
ysr@1280 | 1952 | gclog_or_tty->print(" VerifyDuringGC:(before)"); |
ysr@1280 | 1953 | Universe::heap()->prepare_for_verify(); |
johnc@4176 | 1954 | Universe::verify(/* silent */ false, |
johnc@4176 | 1955 | /* option */ VerifyOption_G1UsePrevMarking); |
ysr@1280 | 1956 | } |
ysr@1280 | 1957 | |
ysr@777 | 1958 | G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
ysr@777 | 1959 | g1p->record_concurrent_mark_cleanup_start(); |
ysr@777 | 1960 | |
ysr@777 | 1961 | double start = os::elapsedTime(); |
ysr@777 | 1962 | |
tonyp@2493 | 1963 | HeapRegionRemSet::reset_for_cleanup_tasks(); |
tonyp@2493 | 1964 | |
jmasa@3357 | 1965 | uint n_workers; |
jmasa@3294 | 1966 | |
ysr@777 | 1967 | // Do counting once more with the world stopped for good measure. |
johnc@3463 | 1968 | G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
johnc@3463 | 1969 | |
jmasa@2188 | 1970 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@3463 | 1971 | assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
tonyp@790 | 1972 | "sanity check"); |
tonyp@790 | 1973 | |
johnc@3338 | 1974 | g1h->set_par_threads(); |
johnc@3338 | 1975 | n_workers = g1h->n_par_threads(); |
jmasa@3357 | 1976 | assert(g1h->n_par_threads() == n_workers, |
johnc@3338 | 1977 | "Should not have been reset"); |
ysr@777 | 1978 | g1h->workers()->run_task(&g1_par_count_task); |
jmasa@3294 | 1979 | // Done with the parallel phase so reset to 0. |
ysr@777 | 1980 | g1h->set_par_threads(0); |
tonyp@790 | 1981 | |
johnc@3463 | 1982 | assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
tonyp@790 | 1983 | "sanity check"); |
ysr@777 | 1984 | } else { |
johnc@3338 | 1985 | n_workers = 1; |
ysr@777 | 1986 | g1_par_count_task.work(0); |
ysr@777 | 1987 | } |
ysr@777 | 1988 | |
johnc@3463 | 1989 | if (VerifyDuringGC) { |
johnc@3463 | 1990 | // Verify that the counting data accumulated during marking matches |
johnc@3463 | 1991 | // that calculated by walking the marking bitmap. |
johnc@3463 | 1992 | |
johnc@3463 | 1993 | // Bitmaps to hold expected values |
johnc@3463 | 1994 | BitMap expected_region_bm(_region_bm.size(), false); |
johnc@3463 | 1995 | BitMap expected_card_bm(_card_bm.size(), false); |
johnc@3463 | 1996 | |
johnc@3463 | 1997 | G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
johnc@3463 | 1998 | &_region_bm, |
johnc@3463 | 1999 | &_card_bm, |
johnc@3463 | 2000 | &expected_region_bm, |
johnc@3463 | 2001 | &expected_card_bm); |
johnc@3463 | 2002 | |
johnc@3463 | 2003 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@3463 | 2004 | g1h->set_par_threads((int)n_workers); |
johnc@3463 | 2005 | g1h->workers()->run_task(&g1_par_verify_task); |
johnc@3463 | 2006 | // Done with the parallel phase so reset to 0. |
johnc@3463 | 2007 | g1h->set_par_threads(0); |
johnc@3463 | 2008 | |
johnc@3463 | 2009 | assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
johnc@3463 | 2010 | "sanity check"); |
johnc@3463 | 2011 | } else { |
johnc@3463 | 2012 | g1_par_verify_task.work(0); |
johnc@3463 | 2013 | } |
johnc@3463 | 2014 | |
johnc@3463 | 2015 | guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
johnc@3463 | 2016 | } |
johnc@3463 | 2017 | |
ysr@777 | 2018 | size_t start_used_bytes = g1h->used(); |
ysr@777 | 2019 | g1h->set_marking_complete(); |
ysr@777 | 2020 | |
ysr@777 | 2021 | double count_end = os::elapsedTime(); |
ysr@777 | 2022 | double this_final_counting_time = (count_end - start); |
ysr@777 | 2023 | _total_counting_time += this_final_counting_time; |
ysr@777 | 2024 | |
tonyp@2717 | 2025 | if (G1PrintRegionLivenessInfo) { |
tonyp@2717 | 2026 | G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
tonyp@2717 | 2027 | _g1h->heap_region_iterate(&cl); |
tonyp@2717 | 2028 | } |
tonyp@2717 | 2029 | |
ysr@777 | 2030 | // Install newly created mark bitMap as "prev". |
ysr@777 | 2031 | swapMarkBitMaps(); |
ysr@777 | 2032 | |
ysr@777 | 2033 | g1h->reset_gc_time_stamp(); |
ysr@777 | 2034 | |
ysr@777 | 2035 | // Note end of marking in all heap regions. |
tonyp@2472 | 2036 | G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
jmasa@2188 | 2037 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
jmasa@3294 | 2038 | g1h->set_par_threads((int)n_workers); |
ysr@777 | 2039 | g1h->workers()->run_task(&g1_par_note_end_task); |
ysr@777 | 2040 | g1h->set_par_threads(0); |
tonyp@790 | 2041 | |
tonyp@790 | 2042 | assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), |
tonyp@790 | 2043 | "sanity check"); |
ysr@777 | 2044 | } else { |
ysr@777 | 2045 | g1_par_note_end_task.work(0); |
ysr@777 | 2046 | } |
tonyp@3957 | 2047 | g1h->check_gc_time_stamps(); |
tonyp@2472 | 2048 | |
tonyp@2472 | 2049 | if (!cleanup_list_is_empty()) { |
tonyp@2472 | 2050 | // The cleanup list is not empty, so we'll have to process it |
tonyp@2472 | 2051 | // concurrently. Notify anyone else that might be wanting free |
tonyp@2472 | 2052 | // regions that there will be more free regions coming soon. |
tonyp@2472 | 2053 | g1h->set_free_regions_coming(); |
tonyp@2472 | 2054 | } |
ysr@777 | 2055 | |
ysr@777 | 2056 | // call below, since it affects the metric by which we sort the heap |
ysr@777 | 2057 | // regions. |
ysr@777 | 2058 | if (G1ScrubRemSets) { |
ysr@777 | 2059 | double rs_scrub_start = os::elapsedTime(); |
ysr@777 | 2060 | G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); |
jmasa@2188 | 2061 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
jmasa@3294 | 2062 | g1h->set_par_threads((int)n_workers); |
ysr@777 | 2063 | g1h->workers()->run_task(&g1_par_scrub_rs_task); |
ysr@777 | 2064 | g1h->set_par_threads(0); |
tonyp@790 | 2065 | |
tonyp@790 | 2066 | assert(g1h->check_heap_region_claim_values( |
tonyp@790 | 2067 | HeapRegion::ScrubRemSetClaimValue), |
tonyp@790 | 2068 | "sanity check"); |
ysr@777 | 2069 | } else { |
ysr@777 | 2070 | g1_par_scrub_rs_task.work(0); |
ysr@777 | 2071 | } |
ysr@777 | 2072 | |
ysr@777 | 2073 | double rs_scrub_end = os::elapsedTime(); |
ysr@777 | 2074 | double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); |
ysr@777 | 2075 | _total_rs_scrub_time += this_rs_scrub_time; |
ysr@777 | 2076 | } |
ysr@777 | 2077 | |
ysr@777 | 2078 | // this will also free any regions totally full of garbage objects, |
ysr@777 | 2079 | // and sort the regions. |
jmasa@3294 | 2080 | g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
ysr@777 | 2081 | |
ysr@777 | 2082 | // Statistics. |
ysr@777 | 2083 | double end = os::elapsedTime(); |
ysr@777 | 2084 | _cleanup_times.add((end - start) * 1000.0); |
ysr@777 | 2085 | |
brutisso@3710 | 2086 | if (G1Log::fine()) { |
ysr@777 | 2087 | g1h->print_size_transition(gclog_or_tty, |
ysr@777 | 2088 | start_used_bytes, |
ysr@777 | 2089 | g1h->used(), |
ysr@777 | 2090 | g1h->capacity()); |
ysr@777 | 2091 | } |
ysr@777 | 2092 | |
johnc@3175 | 2093 | // Clean up will have freed any regions completely full of garbage. |
johnc@3175 | 2094 | // Update the soft reference policy with the new heap occupancy. |
johnc@3175 | 2095 | Universe::update_heap_info_at_gc(); |
johnc@3175 | 2096 | |
ysr@777 | 2097 | // We need to make this be a "collection" so any collection pause that |
ysr@777 | 2098 | // races with it goes around and waits for completeCleanup to finish. |
ysr@777 | 2099 | g1h->increment_total_collections(); |
ysr@777 | 2100 | |
tonyp@3457 | 2101 | // We reclaimed old regions so we should calculate the sizes to make |
tonyp@3457 | 2102 | // sure we update the old gen/space data. |
tonyp@3457 | 2103 | g1h->g1mm()->update_sizes(); |
tonyp@3457 | 2104 | |
johnc@1186 | 2105 | if (VerifyDuringGC) { |
ysr@1280 | 2106 | HandleMark hm; // handle scope |
ysr@1280 | 2107 | gclog_or_tty->print(" VerifyDuringGC:(after)"); |
ysr@1280 | 2108 | Universe::heap()->prepare_for_verify(); |
johnc@4176 | 2109 | Universe::verify(/* silent */ false, |
johnc@4176 | 2110 | /* option */ VerifyOption_G1UsePrevMarking); |
ysr@777 | 2111 | } |
tonyp@2472 | 2112 | |
tonyp@2472 | 2113 | g1h->verify_region_sets_optional(); |
ysr@777 | 2114 | } |
ysr@777 | 2115 | |
ysr@777 | 2116 | void ConcurrentMark::completeCleanup() { |
ysr@777 | 2117 | if (has_aborted()) return; |
ysr@777 | 2118 | |
tonyp@2472 | 2119 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
tonyp@2472 | 2120 | |
tonyp@2472 | 2121 | _cleanup_list.verify_optional(); |
tonyp@2643 | 2122 | FreeRegionList tmp_free_list("Tmp Free List"); |
tonyp@2472 | 2123 | |
tonyp@2472 | 2124 | if (G1ConcRegionFreeingVerbose) { |
tonyp@2472 | 2125 | gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " |
tonyp@3713 | 2126 | "cleanup list has %u entries", |
tonyp@2472 | 2127 | _cleanup_list.length()); |
tonyp@2472 | 2128 | } |
tonyp@2472 | 2129 | |
tonyp@2472 | 2130 | // Noone else should be accessing the _cleanup_list at this point, |
tonyp@2472 | 2131 | // so it's not necessary to take any locks |
tonyp@2472 | 2132 | while (!_cleanup_list.is_empty()) { |
tonyp@2472 | 2133 | HeapRegion* hr = _cleanup_list.remove_head(); |
tonyp@2472 | 2134 | assert(hr != NULL, "the list was not empty"); |
tonyp@2849 | 2135 | hr->par_clear(); |
tonyp@2643 | 2136 | tmp_free_list.add_as_tail(hr); |
tonyp@2472 | 2137 | |
tonyp@2472 | 2138 | // Instead of adding one region at a time to the secondary_free_list, |
tonyp@2472 | 2139 | // we accumulate them in the local list and move them a few at a |
tonyp@2472 | 2140 | // time. This also cuts down on the number of notify_all() calls |
tonyp@2472 | 2141 | // we do during this process. We'll also append the local list when |
tonyp@2472 | 2142 | // _cleanup_list is empty (which means we just removed the last |
tonyp@2472 | 2143 | // region from the _cleanup_list). |
tonyp@2643 | 2144 | if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
tonyp@2472 | 2145 | _cleanup_list.is_empty()) { |
tonyp@2472 | 2146 | if (G1ConcRegionFreeingVerbose) { |
tonyp@2472 | 2147 | gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " |
tonyp@3713 | 2148 | "appending %u entries to the secondary_free_list, " |
tonyp@3713 | 2149 | "cleanup list still has %u entries", |
tonyp@2643 | 2150 | tmp_free_list.length(), |
tonyp@2472 | 2151 | _cleanup_list.length()); |
ysr@777 | 2152 | } |
tonyp@2472 | 2153 | |
tonyp@2472 | 2154 | { |
tonyp@2472 | 2155 | MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
tonyp@2643 | 2156 | g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
tonyp@2472 | 2157 | SecondaryFreeList_lock->notify_all(); |
tonyp@2472 | 2158 | } |
tonyp@2472 | 2159 | |
tonyp@2472 | 2160 | if (G1StressConcRegionFreeing) { |
tonyp@2472 | 2161 | for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { |
tonyp@2472 | 2162 | os::sleep(Thread::current(), (jlong) 1, false); |
tonyp@2472 | 2163 | } |
tonyp@2472 | 2164 | } |
ysr@777 | 2165 | } |
ysr@777 | 2166 | } |
tonyp@2643 | 2167 | assert(tmp_free_list.is_empty(), "post-condition"); |
ysr@777 | 2168 | } |
ysr@777 | 2169 | |
johnc@2494 | 2170 | // Support closures for reference procssing in G1 |
johnc@2494 | 2171 | |
johnc@2379 | 2172 | bool G1CMIsAliveClosure::do_object_b(oop obj) { |
johnc@2379 | 2173 | HeapWord* addr = (HeapWord*)obj; |
johnc@2379 | 2174 | return addr != NULL && |
johnc@2379 | 2175 | (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
johnc@2379 | 2176 | } |
ysr@777 | 2177 | |
coleenp@4037 | 2178 | class G1CMKeepAliveClosure: public ExtendedOopClosure { |
ysr@777 | 2179 | G1CollectedHeap* _g1; |
ysr@777 | 2180 | ConcurrentMark* _cm; |
ysr@777 | 2181 | public: |
johnc@3463 | 2182 | G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
johnc@3463 | 2183 | _g1(g1), _cm(cm) { |
johnc@3463 | 2184 | assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
johnc@3463 | 2185 | } |
ysr@777 | 2186 | |
ysr@1280 | 2187 | virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
ysr@1280 | 2188 | virtual void do_oop( oop* p) { do_oop_work(p); } |
ysr@1280 | 2189 | |
ysr@1280 | 2190 | template <class T> void do_oop_work(T* p) { |
johnc@2494 | 2191 | oop obj = oopDesc::load_decode_heap_oop(p); |
johnc@2494 | 2192 | HeapWord* addr = (HeapWord*)obj; |
johnc@2494 | 2193 | |
tonyp@2973 | 2194 | if (_cm->verbose_high()) { |
johnc@2494 | 2195 | gclog_or_tty->print_cr("\t[0] we're looking at location " |
tonyp@2973 | 2196 | "*"PTR_FORMAT" = "PTR_FORMAT, |
tonyp@2973 | 2197 | p, (void*) obj); |
tonyp@2973 | 2198 | } |
johnc@2494 | 2199 | |
johnc@2494 | 2200 | if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
johnc@3463 | 2201 | _cm->mark_and_count(obj); |
johnc@2494 | 2202 | _cm->mark_stack_push(obj); |
ysr@777 | 2203 | } |
ysr@777 | 2204 | } |
ysr@777 | 2205 | }; |
ysr@777 | 2206 | |
ysr@777 | 2207 | class G1CMDrainMarkingStackClosure: public VoidClosure { |
johnc@3463 | 2208 | ConcurrentMark* _cm; |
ysr@777 | 2209 | CMMarkStack* _markStack; |
ysr@777 | 2210 | G1CMKeepAliveClosure* _oopClosure; |
ysr@777 | 2211 | public: |
johnc@3463 | 2212 | G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
ysr@777 | 2213 | G1CMKeepAliveClosure* oopClosure) : |
johnc@3463 | 2214 | _cm(cm), |
ysr@777 | 2215 | _markStack(markStack), |
johnc@3463 | 2216 | _oopClosure(oopClosure) { } |
ysr@777 | 2217 | |
ysr@777 | 2218 | void do_void() { |
coleenp@4037 | 2219 | _markStack->drain(_oopClosure, _cm->nextMarkBitMap(), false); |
ysr@777 | 2220 | } |
ysr@777 | 2221 | }; |
ysr@777 | 2222 | |
johnc@2494 | 2223 | // 'Keep Alive' closure used by parallel reference processing. |
johnc@2494 | 2224 | // An instance of this closure is used in the parallel reference processing |
johnc@2494 | 2225 | // code rather than an instance of G1CMKeepAliveClosure. We could have used |
johnc@2494 | 2226 | // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
johnc@2494 | 2227 | // placed on to discovered ref lists once so we can mark and push with no |
johnc@2494 | 2228 | // need to check whether the object has already been marked. Using the |
johnc@2494 | 2229 | // G1CMKeepAliveClosure would mean, however, having all the worker threads |
johnc@2494 | 2230 | // operating on the global mark stack. This means that an individual |
johnc@2494 | 2231 | // worker would be doing lock-free pushes while it processes its own |
johnc@2494 | 2232 | // discovered ref list followed by drain call. If the discovered ref lists |
johnc@2494 | 2233 | // are unbalanced then this could cause interference with the other |
johnc@2494 | 2234 | // workers. Using a CMTask (and its embedded local data structures) |
johnc@2494 | 2235 | // avoids that potential interference. |
johnc@2494 | 2236 | class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
johnc@2494 | 2237 | ConcurrentMark* _cm; |
johnc@2494 | 2238 | CMTask* _task; |
johnc@2494 | 2239 | int _ref_counter_limit; |
johnc@2494 | 2240 | int _ref_counter; |
johnc@2494 | 2241 | public: |
johnc@3292 | 2242 | G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
johnc@3292 | 2243 | _cm(cm), _task(task), |
johnc@3292 | 2244 | _ref_counter_limit(G1RefProcDrainInterval) { |
johnc@2494 | 2245 | assert(_ref_counter_limit > 0, "sanity"); |
johnc@2494 | 2246 | _ref_counter = _ref_counter_limit; |
johnc@2494 | 2247 | } |
johnc@2494 | 2248 | |
johnc@2494 | 2249 | virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
johnc@2494 | 2250 | virtual void do_oop( oop* p) { do_oop_work(p); } |
johnc@2494 | 2251 | |
johnc@2494 | 2252 | template <class T> void do_oop_work(T* p) { |
johnc@2494 | 2253 | if (!_cm->has_overflown()) { |
johnc@2494 | 2254 | oop obj = oopDesc::load_decode_heap_oop(p); |
tonyp@2973 | 2255 | if (_cm->verbose_high()) { |
johnc@4173 | 2256 | gclog_or_tty->print_cr("\t[%u] we're looking at location " |
johnc@2494 | 2257 | "*"PTR_FORMAT" = "PTR_FORMAT, |
johnc@4173 | 2258 | _task->worker_id(), p, (void*) obj); |
tonyp@2973 | 2259 | } |
johnc@2494 | 2260 | |
johnc@2494 | 2261 | _task->deal_with_reference(obj); |
johnc@2494 | 2262 | _ref_counter--; |
johnc@2494 | 2263 | |
johnc@2494 | 2264 | if (_ref_counter == 0) { |
johnc@2494 | 2265 | // We have dealt with _ref_counter_limit references, pushing them and objects |
johnc@2494 | 2266 | // reachable from them on to the local stack (and possibly the global stack). |
johnc@2494 | 2267 | // Call do_marking_step() to process these entries. We call the routine in a |
johnc@2494 | 2268 | // loop, which we'll exit if there's nothing more to do (i.e. we're done |
johnc@2494 | 2269 | // with the entries that we've pushed as a result of the deal_with_reference |
johnc@2494 | 2270 | // calls above) or we overflow. |
johnc@2494 | 2271 | // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
johnc@2494 | 2272 | // while there may still be some work to do. (See the comment at the |
johnc@2494 | 2273 | // beginning of CMTask::do_marking_step() for those conditions - one of which |
johnc@2494 | 2274 | // is reaching the specified time target.) It is only when |
johnc@2494 | 2275 | // CMTask::do_marking_step() returns without setting the has_aborted() flag |
johnc@2494 | 2276 | // that the marking has completed. |
johnc@2494 | 2277 | do { |
johnc@2494 | 2278 | double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
johnc@2494 | 2279 | _task->do_marking_step(mark_step_duration_ms, |
johnc@2494 | 2280 | false /* do_stealing */, |
johnc@2494 | 2281 | false /* do_termination */); |
johnc@2494 | 2282 | } while (_task->has_aborted() && !_cm->has_overflown()); |
johnc@2494 | 2283 | _ref_counter = _ref_counter_limit; |
johnc@2494 | 2284 | } |
johnc@2494 | 2285 | } else { |
tonyp@2973 | 2286 | if (_cm->verbose_high()) { |
johnc@4173 | 2287 | gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
tonyp@2973 | 2288 | } |
johnc@2494 | 2289 | } |
johnc@2494 | 2290 | } |
johnc@2494 | 2291 | }; |
johnc@2494 | 2292 | |
johnc@2494 | 2293 | class G1CMParDrainMarkingStackClosure: public VoidClosure { |
johnc@2494 | 2294 | ConcurrentMark* _cm; |
johnc@2494 | 2295 | CMTask* _task; |
johnc@2494 | 2296 | public: |
johnc@2494 | 2297 | G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
johnc@3463 | 2298 | _cm(cm), _task(task) { } |
johnc@2494 | 2299 | |
johnc@2494 | 2300 | void do_void() { |
johnc@2494 | 2301 | do { |
tonyp@2973 | 2302 | if (_cm->verbose_high()) { |
johnc@4173 | 2303 | gclog_or_tty->print_cr("\t[%u] Drain: Calling do marking_step", |
johnc@4173 | 2304 | _task->worker_id()); |
tonyp@2973 | 2305 | } |
johnc@2494 | 2306 | |
johnc@2494 | 2307 | // We call CMTask::do_marking_step() to completely drain the local and |
johnc@2494 | 2308 | // global marking stacks. The routine is called in a loop, which we'll |
johnc@2494 | 2309 | // exit if there's nothing more to do (i.e. we'completely drained the |
johnc@2494 | 2310 | // entries that were pushed as a result of applying the |
johnc@2494 | 2311 | // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
johnc@2494 | 2312 | // lists above) or we overflow the global marking stack. |
johnc@2494 | 2313 | // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
johnc@2494 | 2314 | // while there may still be some work to do. (See the comment at the |
johnc@2494 | 2315 | // beginning of CMTask::do_marking_step() for those conditions - one of which |
johnc@2494 | 2316 | // is reaching the specified time target.) It is only when |
johnc@2494 | 2317 | // CMTask::do_marking_step() returns without setting the has_aborted() flag |
johnc@2494 | 2318 | // that the marking has completed. |
johnc@2494 | 2319 | |
johnc@2494 | 2320 | _task->do_marking_step(1000000000.0 /* something very large */, |
johnc@2494 | 2321 | true /* do_stealing */, |
johnc@2494 | 2322 | true /* do_termination */); |
johnc@2494 | 2323 | } while (_task->has_aborted() && !_cm->has_overflown()); |
johnc@2494 | 2324 | } |
johnc@2494 | 2325 | }; |
johnc@2494 | 2326 | |
johnc@3175 | 2327 | // Implementation of AbstractRefProcTaskExecutor for parallel |
johnc@3175 | 2328 | // reference processing at the end of G1 concurrent marking |
johnc@3175 | 2329 | |
johnc@3175 | 2330 | class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
johnc@2494 | 2331 | private: |
johnc@2494 | 2332 | G1CollectedHeap* _g1h; |
johnc@2494 | 2333 | ConcurrentMark* _cm; |
johnc@2494 | 2334 | WorkGang* _workers; |
johnc@2494 | 2335 | int _active_workers; |
johnc@2494 | 2336 | |
johnc@2494 | 2337 | public: |
johnc@3175 | 2338 | G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
johnc@2494 | 2339 | ConcurrentMark* cm, |
johnc@2494 | 2340 | WorkGang* workers, |
johnc@2494 | 2341 | int n_workers) : |
johnc@3292 | 2342 | _g1h(g1h), _cm(cm), |
johnc@3292 | 2343 | _workers(workers), _active_workers(n_workers) { } |
johnc@2494 | 2344 | |
johnc@2494 | 2345 | // Executes the given task using concurrent marking worker threads. |
johnc@2494 | 2346 | virtual void execute(ProcessTask& task); |
johnc@2494 | 2347 | virtual void execute(EnqueueTask& task); |
johnc@2494 | 2348 | }; |
johnc@2494 | 2349 | |
johnc@3175 | 2350 | class G1CMRefProcTaskProxy: public AbstractGangTask { |
johnc@2494 | 2351 | typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
johnc@2494 | 2352 | ProcessTask& _proc_task; |
johnc@2494 | 2353 | G1CollectedHeap* _g1h; |
johnc@2494 | 2354 | ConcurrentMark* _cm; |
johnc@2494 | 2355 | |
johnc@2494 | 2356 | public: |
johnc@3175 | 2357 | G1CMRefProcTaskProxy(ProcessTask& proc_task, |
johnc@2494 | 2358 | G1CollectedHeap* g1h, |
johnc@3292 | 2359 | ConcurrentMark* cm) : |
johnc@2494 | 2360 | AbstractGangTask("Process reference objects in parallel"), |
johnc@3292 | 2361 | _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
johnc@2494 | 2362 | |
jmasa@3357 | 2363 | virtual void work(uint worker_id) { |
jmasa@3357 | 2364 | CMTask* marking_task = _cm->task(worker_id); |
johnc@2494 | 2365 | G1CMIsAliveClosure g1_is_alive(_g1h); |
johnc@3292 | 2366 | G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
johnc@2494 | 2367 | G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
johnc@2494 | 2368 | |
jmasa@3357 | 2369 | _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
johnc@2494 | 2370 | } |
johnc@2494 | 2371 | }; |
johnc@2494 | 2372 | |
johnc@3175 | 2373 | void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
johnc@2494 | 2374 | assert(_workers != NULL, "Need parallel worker threads."); |
johnc@2494 | 2375 | |
johnc@3292 | 2376 | G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
johnc@2494 | 2377 | |
johnc@2494 | 2378 | // We need to reset the phase for each task execution so that |
johnc@2494 | 2379 | // the termination protocol of CMTask::do_marking_step works. |
johnc@2494 | 2380 | _cm->set_phase(_active_workers, false /* concurrent */); |
johnc@2494 | 2381 | _g1h->set_par_threads(_active_workers); |
johnc@2494 | 2382 | _workers->run_task(&proc_task_proxy); |
johnc@2494 | 2383 | _g1h->set_par_threads(0); |
johnc@2494 | 2384 | } |
johnc@2494 | 2385 | |
johnc@3175 | 2386 | class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
johnc@2494 | 2387 | typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
johnc@2494 | 2388 | EnqueueTask& _enq_task; |
johnc@2494 | 2389 | |
johnc@2494 | 2390 | public: |
johnc@3175 | 2391 | G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
johnc@2494 | 2392 | AbstractGangTask("Enqueue reference objects in parallel"), |
johnc@3292 | 2393 | _enq_task(enq_task) { } |
johnc@2494 | 2394 | |
jmasa@3357 | 2395 | virtual void work(uint worker_id) { |
jmasa@3357 | 2396 | _enq_task.work(worker_id); |
johnc@2494 | 2397 | } |
johnc@2494 | 2398 | }; |
johnc@2494 | 2399 | |
johnc@3175 | 2400 | void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
johnc@2494 | 2401 | assert(_workers != NULL, "Need parallel worker threads."); |
johnc@2494 | 2402 | |
johnc@3175 | 2403 | G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
johnc@2494 | 2404 | |
johnc@2494 | 2405 | _g1h->set_par_threads(_active_workers); |
johnc@2494 | 2406 | _workers->run_task(&enq_task_proxy); |
johnc@2494 | 2407 | _g1h->set_par_threads(0); |
johnc@2494 | 2408 | } |
johnc@2494 | 2409 | |
ysr@777 | 2410 | void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
ysr@777 | 2411 | ResourceMark rm; |
ysr@777 | 2412 | HandleMark hm; |
johnc@3171 | 2413 | |
johnc@3171 | 2414 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
johnc@3171 | 2415 | |
johnc@3171 | 2416 | // Is alive closure. |
johnc@3171 | 2417 | G1CMIsAliveClosure g1_is_alive(g1h); |
johnc@3171 | 2418 | |
johnc@3171 | 2419 | // Inner scope to exclude the cleaning of the string and symbol |
johnc@3171 | 2420 | // tables from the displayed time. |
johnc@3171 | 2421 | { |
brutisso@3710 | 2422 | if (G1Log::finer()) { |
johnc@3171 | 2423 | gclog_or_tty->put(' '); |
johnc@3171 | 2424 | } |
brutisso@3710 | 2425 | TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
johnc@3171 | 2426 | |
johnc@3175 | 2427 | ReferenceProcessor* rp = g1h->ref_processor_cm(); |
johnc@3171 | 2428 | |
johnc@3171 | 2429 | // See the comment in G1CollectedHeap::ref_processing_init() |
johnc@3171 | 2430 | // about how reference processing currently works in G1. |
johnc@3171 | 2431 | |
johnc@3171 | 2432 | // Process weak references. |
johnc@3171 | 2433 | rp->setup_policy(clear_all_soft_refs); |
johnc@3171 | 2434 | assert(_markStack.isEmpty(), "mark stack should be empty"); |
johnc@3171 | 2435 | |
johnc@3463 | 2436 | G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
johnc@3171 | 2437 | G1CMDrainMarkingStackClosure |
johnc@3463 | 2438 | g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
johnc@3171 | 2439 | |
johnc@3171 | 2440 | // We use the work gang from the G1CollectedHeap and we utilize all |
johnc@3171 | 2441 | // the worker threads. |
jmasa@3357 | 2442 | uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
johnc@4173 | 2443 | active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
johnc@3171 | 2444 | |
johnc@3292 | 2445 | G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
johnc@3175 | 2446 | g1h->workers(), active_workers); |
johnc@3171 | 2447 | |
johnc@3171 | 2448 | if (rp->processing_is_mt()) { |
johnc@3171 | 2449 | // Set the degree of MT here. If the discovery is done MT, there |
johnc@3171 | 2450 | // may have been a different number of threads doing the discovery |
johnc@3171 | 2451 | // and a different number of discovered lists may have Ref objects. |
johnc@3171 | 2452 | // That is OK as long as the Reference lists are balanced (see |
johnc@3171 | 2453 | // balance_all_queues() and balance_queues()). |
johnc@3171 | 2454 | rp->set_active_mt_degree(active_workers); |
johnc@3171 | 2455 | |
johnc@3171 | 2456 | rp->process_discovered_references(&g1_is_alive, |
johnc@2494 | 2457 | &g1_keep_alive, |
johnc@2494 | 2458 | &g1_drain_mark_stack, |
johnc@2494 | 2459 | &par_task_executor); |
johnc@2494 | 2460 | |
johnc@3171 | 2461 | // The work routines of the parallel keep_alive and drain_marking_stack |
johnc@3171 | 2462 | // will set the has_overflown flag if we overflow the global marking |
johnc@3171 | 2463 | // stack. |
johnc@3171 | 2464 | } else { |
johnc@3171 | 2465 | rp->process_discovered_references(&g1_is_alive, |
johnc@3171 | 2466 | &g1_keep_alive, |
johnc@3171 | 2467 | &g1_drain_mark_stack, |
johnc@3171 | 2468 | NULL); |
johnc@3171 | 2469 | } |
johnc@3171 | 2470 | |
johnc@3171 | 2471 | assert(_markStack.overflow() || _markStack.isEmpty(), |
johnc@3171 | 2472 | "mark stack should be empty (unless it overflowed)"); |
johnc@3171 | 2473 | if (_markStack.overflow()) { |
johnc@3171 | 2474 | // Should have been done already when we tried to push an |
johnc@3171 | 2475 | // entry on to the global mark stack. But let's do it again. |
johnc@3171 | 2476 | set_has_overflown(); |
johnc@3171 | 2477 | } |
johnc@3171 | 2478 | |
johnc@3171 | 2479 | if (rp->processing_is_mt()) { |
johnc@3171 | 2480 | assert(rp->num_q() == active_workers, "why not"); |
johnc@3171 | 2481 | rp->enqueue_discovered_references(&par_task_executor); |
johnc@3171 | 2482 | } else { |
johnc@3171 | 2483 | rp->enqueue_discovered_references(); |
johnc@3171 | 2484 | } |
johnc@3171 | 2485 | |
johnc@3171 | 2486 | rp->verify_no_references_recorded(); |
johnc@3175 | 2487 | assert(!rp->discovery_enabled(), "Post condition"); |
johnc@2494 | 2488 | } |
johnc@2494 | 2489 | |
coleenp@2497 | 2490 | // Now clean up stale oops in StringTable |
johnc@2379 | 2491 | StringTable::unlink(&g1_is_alive); |
coleenp@2497 | 2492 | // Clean up unreferenced symbols in symbol table. |
coleenp@2497 | 2493 | SymbolTable::unlink(); |
ysr@777 | 2494 | } |
ysr@777 | 2495 | |
ysr@777 | 2496 | void ConcurrentMark::swapMarkBitMaps() { |
ysr@777 | 2497 | CMBitMapRO* temp = _prevMarkBitMap; |
ysr@777 | 2498 | _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; |
ysr@777 | 2499 | _nextMarkBitMap = (CMBitMap*) temp; |
ysr@777 | 2500 | } |
ysr@777 | 2501 | |
ysr@777 | 2502 | class CMRemarkTask: public AbstractGangTask { |
ysr@777 | 2503 | private: |
ysr@777 | 2504 | ConcurrentMark *_cm; |
ysr@777 | 2505 | |
ysr@777 | 2506 | public: |
jmasa@3357 | 2507 | void work(uint worker_id) { |
ysr@777 | 2508 | // Since all available tasks are actually started, we should |
ysr@777 | 2509 | // only proceed if we're supposed to be actived. |
jmasa@3357 | 2510 | if (worker_id < _cm->active_tasks()) { |
jmasa@3357 | 2511 | CMTask* task = _cm->task(worker_id); |
ysr@777 | 2512 | task->record_start_time(); |
ysr@777 | 2513 | do { |
johnc@2494 | 2514 | task->do_marking_step(1000000000.0 /* something very large */, |
johnc@2494 | 2515 | true /* do_stealing */, |
johnc@2494 | 2516 | true /* do_termination */); |
ysr@777 | 2517 | } while (task->has_aborted() && !_cm->has_overflown()); |
ysr@777 | 2518 | // If we overflow, then we do not want to restart. We instead |
ysr@777 | 2519 | // want to abort remark and do concurrent marking again. |
ysr@777 | 2520 | task->record_end_time(); |
ysr@777 | 2521 | } |
ysr@777 | 2522 | } |
ysr@777 | 2523 | |
johnc@3338 | 2524 | CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
jmasa@3294 | 2525 | AbstractGangTask("Par Remark"), _cm(cm) { |
johnc@3338 | 2526 | _cm->terminator()->reset_for_reuse(active_workers); |
jmasa@3294 | 2527 | } |
ysr@777 | 2528 | }; |
ysr@777 | 2529 | |
ysr@777 | 2530 | void ConcurrentMark::checkpointRootsFinalWork() { |
ysr@777 | 2531 | ResourceMark rm; |
ysr@777 | 2532 | HandleMark hm; |
ysr@777 | 2533 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 2534 | |
ysr@777 | 2535 | g1h->ensure_parsability(false); |
ysr@777 | 2536 | |
jmasa@2188 | 2537 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
jrose@1424 | 2538 | G1CollectedHeap::StrongRootsScope srs(g1h); |
jmasa@3294 | 2539 | // this is remark, so we'll use up all active threads |
jmasa@3357 | 2540 | uint active_workers = g1h->workers()->active_workers(); |
jmasa@3294 | 2541 | if (active_workers == 0) { |
jmasa@3294 | 2542 | assert(active_workers > 0, "Should have been set earlier"); |
jmasa@3357 | 2543 | active_workers = (uint) ParallelGCThreads; |
jmasa@3294 | 2544 | g1h->workers()->set_active_workers(active_workers); |
jmasa@3294 | 2545 | } |
johnc@2494 | 2546 | set_phase(active_workers, false /* concurrent */); |
jmasa@3294 | 2547 | // Leave _parallel_marking_threads at it's |
jmasa@3294 | 2548 | // value originally calculated in the ConcurrentMark |
jmasa@3294 | 2549 | // constructor and pass values of the active workers |
jmasa@3294 | 2550 | // through the gang in the task. |
ysr@777 | 2551 | |
johnc@3338 | 2552 | CMRemarkTask remarkTask(this, active_workers); |
jmasa@3294 | 2553 | g1h->set_par_threads(active_workers); |
ysr@777 | 2554 | g1h->workers()->run_task(&remarkTask); |
ysr@777 | 2555 | g1h->set_par_threads(0); |
ysr@777 | 2556 | } else { |
jrose@1424 | 2557 | G1CollectedHeap::StrongRootsScope srs(g1h); |
ysr@777 | 2558 | // this is remark, so we'll use up all available threads |
jmasa@3357 | 2559 | uint active_workers = 1; |
johnc@2494 | 2560 | set_phase(active_workers, false /* concurrent */); |
ysr@777 | 2561 | |
johnc@3338 | 2562 | CMRemarkTask remarkTask(this, active_workers); |
ysr@777 | 2563 | // We will start all available threads, even if we decide that the |
ysr@777 | 2564 | // active_workers will be fewer. The extra ones will just bail out |
ysr@777 | 2565 | // immediately. |
ysr@777 | 2566 | remarkTask.work(0); |
ysr@777 | 2567 | } |
tonyp@1458 | 2568 | SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
tonyp@1458 | 2569 | guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
ysr@777 | 2570 | |
ysr@777 | 2571 | print_stats(); |
ysr@777 | 2572 | |
ysr@777 | 2573 | #if VERIFY_OBJS_PROCESSED |
ysr@777 | 2574 | if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { |
ysr@777 | 2575 | gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", |
ysr@777 | 2576 | _scan_obj_cl.objs_processed, |
ysr@777 | 2577 | ThreadLocalObjQueue::objs_enqueued); |
ysr@777 | 2578 | guarantee(_scan_obj_cl.objs_processed == |
ysr@777 | 2579 | ThreadLocalObjQueue::objs_enqueued, |
ysr@777 | 2580 | "Different number of objs processed and enqueued."); |
ysr@777 | 2581 | } |
ysr@777 | 2582 | #endif |
ysr@777 | 2583 | } |
ysr@777 | 2584 | |
tonyp@1479 | 2585 | #ifndef PRODUCT |
tonyp@1479 | 2586 | |
tonyp@1823 | 2587 | class PrintReachableOopClosure: public OopClosure { |
ysr@777 | 2588 | private: |
ysr@777 | 2589 | G1CollectedHeap* _g1h; |
ysr@777 | 2590 | outputStream* _out; |
johnc@2969 | 2591 | VerifyOption _vo; |
tonyp@1823 | 2592 | bool _all; |
ysr@777 | 2593 | |
ysr@777 | 2594 | public: |
johnc@2969 | 2595 | PrintReachableOopClosure(outputStream* out, |
johnc@2969 | 2596 | VerifyOption vo, |
tonyp@1823 | 2597 | bool all) : |
tonyp@1479 | 2598 | _g1h(G1CollectedHeap::heap()), |
johnc@2969 | 2599 | _out(out), _vo(vo), _all(all) { } |
ysr@777 | 2600 | |
ysr@1280 | 2601 | void do_oop(narrowOop* p) { do_oop_work(p); } |
ysr@1280 | 2602 | void do_oop( oop* p) { do_oop_work(p); } |
ysr@1280 | 2603 | |
ysr@1280 | 2604 | template <class T> void do_oop_work(T* p) { |
ysr@1280 | 2605 | oop obj = oopDesc::load_decode_heap_oop(p); |
ysr@777 | 2606 | const char* str = NULL; |
ysr@777 | 2607 | const char* str2 = ""; |
ysr@777 | 2608 | |
tonyp@1823 | 2609 | if (obj == NULL) { |
tonyp@1823 | 2610 | str = ""; |
tonyp@1823 | 2611 | } else if (!_g1h->is_in_g1_reserved(obj)) { |
tonyp@1823 | 2612 | str = " O"; |
tonyp@1823 | 2613 | } else { |
ysr@777 | 2614 | HeapRegion* hr = _g1h->heap_region_containing(obj); |
tonyp@1458 | 2615 | guarantee(hr != NULL, "invariant"); |
tonyp@3957 | 2616 | bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
tonyp@3957 | 2617 | bool marked = _g1h->is_marked(obj, _vo); |
tonyp@1479 | 2618 | |
tonyp@1479 | 2619 | if (over_tams) { |
tonyp@1823 | 2620 | str = " >"; |
tonyp@1823 | 2621 | if (marked) { |
ysr@777 | 2622 | str2 = " AND MARKED"; |
tonyp@1479 | 2623 | } |
tonyp@1823 | 2624 | } else if (marked) { |
tonyp@1823 | 2625 | str = " M"; |
tonyp@1479 | 2626 | } else { |
tonyp@1823 | 2627 | str = " NOT"; |
tonyp@1479 | 2628 | } |
ysr@777 | 2629 | } |
ysr@777 | 2630 | |
tonyp@1823 | 2631 | _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
ysr@777 | 2632 | p, (void*) obj, str, str2); |
ysr@777 | 2633 | } |
ysr@777 | 2634 | }; |
ysr@777 | 2635 | |
tonyp@1823 | 2636 | class PrintReachableObjectClosure : public ObjectClosure { |
ysr@777 | 2637 | private: |
johnc@2969 | 2638 | G1CollectedHeap* _g1h; |
johnc@2969 | 2639 | outputStream* _out; |
johnc@2969 | 2640 | VerifyOption _vo; |
johnc@2969 | 2641 | bool _all; |
johnc@2969 | 2642 | HeapRegion* _hr; |
ysr@777 | 2643 | |
ysr@777 | 2644 | public: |
johnc@2969 | 2645 | PrintReachableObjectClosure(outputStream* out, |
johnc@2969 | 2646 | VerifyOption vo, |
tonyp@1823 | 2647 | bool all, |
tonyp@1823 | 2648 | HeapRegion* hr) : |
johnc@2969 | 2649 | _g1h(G1CollectedHeap::heap()), |
johnc@2969 | 2650 | _out(out), _vo(vo), _all(all), _hr(hr) { } |
tonyp@1823 | 2651 | |
tonyp@1823 | 2652 | void do_object(oop o) { |
tonyp@3957 | 2653 | bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
tonyp@3957 | 2654 | bool marked = _g1h->is_marked(o, _vo); |
tonyp@1823 | 2655 | bool print_it = _all || over_tams || marked; |
tonyp@1823 | 2656 | |
tonyp@1823 | 2657 | if (print_it) { |
tonyp@1823 | 2658 | _out->print_cr(" "PTR_FORMAT"%s", |
tonyp@1823 | 2659 | o, (over_tams) ? " >" : (marked) ? " M" : ""); |
johnc@2969 | 2660 | PrintReachableOopClosure oopCl(_out, _vo, _all); |
coleenp@4037 | 2661 | o->oop_iterate_no_header(&oopCl); |
tonyp@1823 | 2662 | } |
ysr@777 | 2663 | } |
ysr@777 | 2664 | }; |
ysr@777 | 2665 | |
tonyp@1823 | 2666 | class PrintReachableRegionClosure : public HeapRegionClosure { |
ysr@777 | 2667 | private: |
tonyp@3957 | 2668 | G1CollectedHeap* _g1h; |
tonyp@3957 | 2669 | outputStream* _out; |
tonyp@3957 | 2670 | VerifyOption _vo; |
tonyp@3957 | 2671 | bool _all; |
ysr@777 | 2672 | |
ysr@777 | 2673 | public: |
ysr@777 | 2674 | bool doHeapRegion(HeapRegion* hr) { |
ysr@777 | 2675 | HeapWord* b = hr->bottom(); |
ysr@777 | 2676 | HeapWord* e = hr->end(); |
ysr@777 | 2677 | HeapWord* t = hr->top(); |
tonyp@3957 | 2678 | HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
ysr@777 | 2679 | _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
tonyp@1479 | 2680 | "TAMS: "PTR_FORMAT, b, e, t, p); |
tonyp@1823 | 2681 | _out->cr(); |
tonyp@1823 | 2682 | |
tonyp@1823 | 2683 | HeapWord* from = b; |
tonyp@1823 | 2684 | HeapWord* to = t; |
tonyp@1823 | 2685 | |
tonyp@1823 | 2686 | if (to > from) { |
tonyp@1823 | 2687 | _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); |
tonyp@1823 | 2688 | _out->cr(); |
johnc@2969 | 2689 | PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
tonyp@1823 | 2690 | hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
tonyp@1823 | 2691 | _out->cr(); |
tonyp@1823 | 2692 | } |
ysr@777 | 2693 | |
ysr@777 | 2694 | return false; |
ysr@777 | 2695 | } |
ysr@777 | 2696 | |
johnc@2969 | 2697 | PrintReachableRegionClosure(outputStream* out, |
johnc@2969 | 2698 | VerifyOption vo, |
tonyp@1823 | 2699 | bool all) : |
tonyp@3957 | 2700 | _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
ysr@777 | 2701 | }; |
ysr@777 | 2702 | |
tonyp@1823 | 2703 | void ConcurrentMark::print_reachable(const char* str, |
johnc@2969 | 2704 | VerifyOption vo, |
tonyp@1823 | 2705 | bool all) { |
tonyp@1823 | 2706 | gclog_or_tty->cr(); |
tonyp@1823 | 2707 | gclog_or_tty->print_cr("== Doing heap dump... "); |
tonyp@1479 | 2708 | |
tonyp@1479 | 2709 | if (G1PrintReachableBaseFile == NULL) { |
tonyp@1479 | 2710 | gclog_or_tty->print_cr(" #### error: no base file defined"); |
tonyp@1479 | 2711 | return; |
tonyp@1479 | 2712 | } |
tonyp@1479 | 2713 | |
tonyp@1479 | 2714 | if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > |
tonyp@1479 | 2715 | (JVM_MAXPATHLEN - 1)) { |
tonyp@1479 | 2716 | gclog_or_tty->print_cr(" #### error: file name too long"); |
tonyp@1479 | 2717 | return; |
tonyp@1479 | 2718 | } |
tonyp@1479 | 2719 | |
tonyp@1479 | 2720 | char file_name[JVM_MAXPATHLEN]; |
tonyp@1479 | 2721 | sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); |
tonyp@1479 | 2722 | gclog_or_tty->print_cr(" dumping to file %s", file_name); |
tonyp@1479 | 2723 | |
tonyp@1479 | 2724 | fileStream fout(file_name); |
tonyp@1479 | 2725 | if (!fout.is_open()) { |
tonyp@1479 | 2726 | gclog_or_tty->print_cr(" #### error: could not open file"); |
tonyp@1479 | 2727 | return; |
tonyp@1479 | 2728 | } |
tonyp@1479 | 2729 | |
tonyp@1479 | 2730 | outputStream* out = &fout; |
tonyp@3957 | 2731 | out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
tonyp@1479 | 2732 | out->cr(); |
tonyp@1479 | 2733 | |
tonyp@1823 | 2734 | out->print_cr("--- ITERATING OVER REGIONS"); |
tonyp@1479 | 2735 | out->cr(); |
johnc@2969 | 2736 | PrintReachableRegionClosure rcl(out, vo, all); |
ysr@777 | 2737 | _g1h->heap_region_iterate(&rcl); |
tonyp@1479 | 2738 | out->cr(); |
tonyp@1479 | 2739 | |
tonyp@1479 | 2740 | gclog_or_tty->print_cr(" done"); |
tonyp@1823 | 2741 | gclog_or_tty->flush(); |
ysr@777 | 2742 | } |
ysr@777 | 2743 | |
tonyp@1479 | 2744 | #endif // PRODUCT |
tonyp@1479 | 2745 | |
tonyp@3416 | 2746 | void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
ysr@777 | 2747 | // Note we are overriding the read-only view of the prev map here, via |
ysr@777 | 2748 | // the cast. |
ysr@777 | 2749 | ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); |
tonyp@3416 | 2750 | } |
tonyp@3416 | 2751 | |
tonyp@3416 | 2752 | void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
ysr@777 | 2753 | _nextMarkBitMap->clearRange(mr); |
ysr@777 | 2754 | } |
ysr@777 | 2755 | |
tonyp@3416 | 2756 | void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
tonyp@3416 | 2757 | clearRangePrevBitmap(mr); |
tonyp@3416 | 2758 | clearRangeNextBitmap(mr); |
tonyp@3416 | 2759 | } |
tonyp@3416 | 2760 | |
ysr@777 | 2761 | HeapRegion* |
johnc@4173 | 2762 | ConcurrentMark::claim_region(uint worker_id) { |
ysr@777 | 2763 | // "checkpoint" the finger |
ysr@777 | 2764 | HeapWord* finger = _finger; |
ysr@777 | 2765 | |
ysr@777 | 2766 | // _heap_end will not change underneath our feet; it only changes at |
ysr@777 | 2767 | // yield points. |
ysr@777 | 2768 | while (finger < _heap_end) { |
tonyp@1458 | 2769 | assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
ysr@777 | 2770 | |
tonyp@2968 | 2771 | // Note on how this code handles humongous regions. In the |
tonyp@2968 | 2772 | // normal case the finger will reach the start of a "starts |
tonyp@2968 | 2773 | // humongous" (SH) region. Its end will either be the end of the |
tonyp@2968 | 2774 | // last "continues humongous" (CH) region in the sequence, or the |
tonyp@2968 | 2775 | // standard end of the SH region (if the SH is the only region in |
tonyp@2968 | 2776 | // the sequence). That way claim_region() will skip over the CH |
tonyp@2968 | 2777 | // regions. However, there is a subtle race between a CM thread |
tonyp@2968 | 2778 | // executing this method and a mutator thread doing a humongous |
tonyp@2968 | 2779 | // object allocation. The two are not mutually exclusive as the CM |
tonyp@2968 | 2780 | // thread does not need to hold the Heap_lock when it gets |
tonyp@2968 | 2781 | // here. So there is a chance that claim_region() will come across |
tonyp@2968 | 2782 | // a free region that's in the progress of becoming a SH or a CH |
tonyp@2968 | 2783 | // region. In the former case, it will either |
tonyp@2968 | 2784 | // a) Miss the update to the region's end, in which case it will |
tonyp@2968 | 2785 | // visit every subsequent CH region, will find their bitmaps |
tonyp@2968 | 2786 | // empty, and do nothing, or |
tonyp@2968 | 2787 | // b) Will observe the update of the region's end (in which case |
tonyp@2968 | 2788 | // it will skip the subsequent CH regions). |
tonyp@2968 | 2789 | // If it comes across a region that suddenly becomes CH, the |
tonyp@2968 | 2790 | // scenario will be similar to b). So, the race between |
tonyp@2968 | 2791 | // claim_region() and a humongous object allocation might force us |
tonyp@2968 | 2792 | // to do a bit of unnecessary work (due to some unnecessary bitmap |
tonyp@2968 | 2793 | // iterations) but it should not introduce and correctness issues. |
tonyp@2968 | 2794 | HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); |
ysr@777 | 2795 | HeapWord* bottom = curr_region->bottom(); |
ysr@777 | 2796 | HeapWord* end = curr_region->end(); |
ysr@777 | 2797 | HeapWord* limit = curr_region->next_top_at_mark_start(); |
ysr@777 | 2798 | |
tonyp@2968 | 2799 | if (verbose_low()) { |
johnc@4173 | 2800 | gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
ysr@777 | 2801 | "["PTR_FORMAT", "PTR_FORMAT"), " |
ysr@777 | 2802 | "limit = "PTR_FORMAT, |
johnc@4173 | 2803 | worker_id, curr_region, bottom, end, limit); |
tonyp@2968 | 2804 | } |
tonyp@2968 | 2805 | |
tonyp@2968 | 2806 | // Is the gap between reading the finger and doing the CAS too long? |
tonyp@2968 | 2807 | HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); |
ysr@777 | 2808 | if (res == finger) { |
ysr@777 | 2809 | // we succeeded |
ysr@777 | 2810 | |
ysr@777 | 2811 | // notice that _finger == end cannot be guaranteed here since, |
ysr@777 | 2812 | // someone else might have moved the finger even further |
tonyp@1458 | 2813 | assert(_finger >= end, "the finger should have moved forward"); |
ysr@777 | 2814 | |
tonyp@2973 | 2815 | if (verbose_low()) { |
johnc@4173 | 2816 | gclog_or_tty->print_cr("[%u] we were successful with region = " |
johnc@4173 | 2817 | PTR_FORMAT, worker_id, curr_region); |
tonyp@2973 | 2818 | } |
ysr@777 | 2819 | |
ysr@777 | 2820 | if (limit > bottom) { |
tonyp@2973 | 2821 | if (verbose_low()) { |
johnc@4173 | 2822 | gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
johnc@4173 | 2823 | "returning it ", worker_id, curr_region); |
tonyp@2973 | 2824 | } |
ysr@777 | 2825 | return curr_region; |
ysr@777 | 2826 | } else { |
tonyp@1458 | 2827 | assert(limit == bottom, |
tonyp@1458 | 2828 | "the region limit should be at bottom"); |
tonyp@2973 | 2829 | if (verbose_low()) { |
johnc@4173 | 2830 | gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
johnc@4173 | 2831 | "returning NULL", worker_id, curr_region); |
tonyp@2973 | 2832 | } |
ysr@777 | 2833 | // we return NULL and the caller should try calling |
ysr@777 | 2834 | // claim_region() again. |
ysr@777 | 2835 | return NULL; |
ysr@777 | 2836 | } |
ysr@777 | 2837 | } else { |
tonyp@1458 | 2838 | assert(_finger > finger, "the finger should have moved forward"); |
tonyp@2973 | 2839 | if (verbose_low()) { |
johnc@4173 | 2840 | gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
ysr@777 | 2841 | "global finger = "PTR_FORMAT", " |
ysr@777 | 2842 | "our finger = "PTR_FORMAT, |
johnc@4173 | 2843 | worker_id, _finger, finger); |
tonyp@2973 | 2844 | } |
ysr@777 | 2845 | |
ysr@777 | 2846 | // read it again |
ysr@777 | 2847 | finger = _finger; |
ysr@777 | 2848 | } |
ysr@777 | 2849 | } |
ysr@777 | 2850 | |
ysr@777 | 2851 | return NULL; |
ysr@777 | 2852 | } |
ysr@777 | 2853 | |
tonyp@3416 | 2854 | #ifndef PRODUCT |
tonyp@3416 | 2855 | enum VerifyNoCSetOopsPhase { |
tonyp@3416 | 2856 | VerifyNoCSetOopsStack, |
tonyp@3416 | 2857 | VerifyNoCSetOopsQueues, |
tonyp@3416 | 2858 | VerifyNoCSetOopsSATBCompleted, |
tonyp@3416 | 2859 | VerifyNoCSetOopsSATBThread |
tonyp@3416 | 2860 | }; |
tonyp@3416 | 2861 | |
tonyp@3416 | 2862 | class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
tonyp@3416 | 2863 | private: |
tonyp@3416 | 2864 | G1CollectedHeap* _g1h; |
tonyp@3416 | 2865 | VerifyNoCSetOopsPhase _phase; |
tonyp@3416 | 2866 | int _info; |
tonyp@3416 | 2867 | |
tonyp@3416 | 2868 | const char* phase_str() { |
tonyp@3416 | 2869 | switch (_phase) { |
tonyp@3416 | 2870 | case VerifyNoCSetOopsStack: return "Stack"; |
tonyp@3416 | 2871 | case VerifyNoCSetOopsQueues: return "Queue"; |
tonyp@3416 | 2872 | case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
tonyp@3416 | 2873 | case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
tonyp@3416 | 2874 | default: ShouldNotReachHere(); |
tonyp@3416 | 2875 | } |
tonyp@3416 | 2876 | return NULL; |
ysr@777 | 2877 | } |
johnc@2190 | 2878 | |
tonyp@3416 | 2879 | void do_object_work(oop obj) { |
tonyp@3416 | 2880 | guarantee(!_g1h->obj_in_cs(obj), |
tonyp@3416 | 2881 | err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
tonyp@3416 | 2882 | (void*) obj, phase_str(), _info)); |
johnc@2190 | 2883 | } |
johnc@2190 | 2884 | |
tonyp@3416 | 2885 | public: |
tonyp@3416 | 2886 | VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
tonyp@3416 | 2887 | |
tonyp@3416 | 2888 | void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
tonyp@3416 | 2889 | _phase = phase; |
tonyp@3416 | 2890 | _info = info; |
tonyp@3416 | 2891 | } |
tonyp@3416 | 2892 | |
tonyp@3416 | 2893 | virtual void do_oop(oop* p) { |
tonyp@3416 | 2894 | oop obj = oopDesc::load_decode_heap_oop(p); |
tonyp@3416 | 2895 | do_object_work(obj); |
tonyp@3416 | 2896 | } |
tonyp@3416 | 2897 | |
tonyp@3416 | 2898 | virtual void do_oop(narrowOop* p) { |
tonyp@3416 | 2899 | // We should not come across narrow oops while scanning marking |
tonyp@3416 | 2900 | // stacks and SATB buffers. |
tonyp@3416 | 2901 | ShouldNotReachHere(); |
tonyp@3416 | 2902 | } |
tonyp@3416 | 2903 | |
tonyp@3416 | 2904 | virtual void do_object(oop obj) { |
tonyp@3416 | 2905 | do_object_work(obj); |
tonyp@3416 | 2906 | } |
tonyp@3416 | 2907 | }; |
tonyp@3416 | 2908 | |
tonyp@3416 | 2909 | void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
tonyp@3416 | 2910 | bool verify_enqueued_buffers, |
tonyp@3416 | 2911 | bool verify_thread_buffers, |
tonyp@3416 | 2912 | bool verify_fingers) { |
tonyp@3416 | 2913 | assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
tonyp@3416 | 2914 | if (!G1CollectedHeap::heap()->mark_in_progress()) { |
tonyp@3416 | 2915 | return; |
tonyp@3416 | 2916 | } |
tonyp@3416 | 2917 | |
tonyp@3416 | 2918 | VerifyNoCSetOopsClosure cl; |
tonyp@3416 | 2919 | |
tonyp@3416 | 2920 | if (verify_stacks) { |
tonyp@3416 | 2921 | // Verify entries on the global mark stack |
tonyp@3416 | 2922 | cl.set_phase(VerifyNoCSetOopsStack); |
tonyp@3416 | 2923 | _markStack.oops_do(&cl); |
tonyp@3416 | 2924 | |
tonyp@3416 | 2925 | // Verify entries on the task queues |
johnc@4173 | 2926 | for (uint i = 0; i < _max_worker_id; i += 1) { |
tonyp@3416 | 2927 | cl.set_phase(VerifyNoCSetOopsQueues, i); |
johnc@4333 | 2928 | CMTaskQueue* queue = _task_queues->queue(i); |
tonyp@3416 | 2929 | queue->oops_do(&cl); |
tonyp@3416 | 2930 | } |
tonyp@3416 | 2931 | } |
tonyp@3416 | 2932 | |
tonyp@3416 | 2933 | SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
tonyp@3416 | 2934 | |
tonyp@3416 | 2935 | // Verify entries on the enqueued SATB buffers |
tonyp@3416 | 2936 | if (verify_enqueued_buffers) { |
tonyp@3416 | 2937 | cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
tonyp@3416 | 2938 | satb_qs.iterate_completed_buffers_read_only(&cl); |
tonyp@3416 | 2939 | } |
tonyp@3416 | 2940 | |
tonyp@3416 | 2941 | // Verify entries on the per-thread SATB buffers |
tonyp@3416 | 2942 | if (verify_thread_buffers) { |
tonyp@3416 | 2943 | cl.set_phase(VerifyNoCSetOopsSATBThread); |
tonyp@3416 | 2944 | satb_qs.iterate_thread_buffers_read_only(&cl); |
tonyp@3416 | 2945 | } |
tonyp@3416 | 2946 | |
tonyp@3416 | 2947 | if (verify_fingers) { |
tonyp@3416 | 2948 | // Verify the global finger |
tonyp@3416 | 2949 | HeapWord* global_finger = finger(); |
tonyp@3416 | 2950 | if (global_finger != NULL && global_finger < _heap_end) { |
tonyp@3416 | 2951 | // The global finger always points to a heap region boundary. We |
tonyp@3416 | 2952 | // use heap_region_containing_raw() to get the containing region |
tonyp@3416 | 2953 | // given that the global finger could be pointing to a free region |
tonyp@3416 | 2954 | // which subsequently becomes continues humongous. If that |
tonyp@3416 | 2955 | // happens, heap_region_containing() will return the bottom of the |
tonyp@3416 | 2956 | // corresponding starts humongous region and the check below will |
tonyp@3416 | 2957 | // not hold any more. |
tonyp@3416 | 2958 | HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
tonyp@3416 | 2959 | guarantee(global_finger == global_hr->bottom(), |
tonyp@3416 | 2960 | err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
tonyp@3416 | 2961 | global_finger, HR_FORMAT_PARAMS(global_hr))); |
tonyp@3416 | 2962 | } |
tonyp@3416 | 2963 | |
tonyp@3416 | 2964 | // Verify the task fingers |
johnc@4173 | 2965 | assert(parallel_marking_threads() <= _max_worker_id, "sanity"); |
tonyp@3416 | 2966 | for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
tonyp@3416 | 2967 | CMTask* task = _tasks[i]; |
tonyp@3416 | 2968 | HeapWord* task_finger = task->finger(); |
tonyp@3416 | 2969 | if (task_finger != NULL && task_finger < _heap_end) { |
tonyp@3416 | 2970 | // See above note on the global finger verification. |
tonyp@3416 | 2971 | HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
tonyp@3416 | 2972 | guarantee(task_finger == task_hr->bottom() || |
tonyp@3416 | 2973 | !task_hr->in_collection_set(), |
tonyp@3416 | 2974 | err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
tonyp@3416 | 2975 | task_finger, HR_FORMAT_PARAMS(task_hr))); |
tonyp@3416 | 2976 | } |
tonyp@3416 | 2977 | } |
tonyp@3416 | 2978 | } |
ysr@777 | 2979 | } |
tonyp@3416 | 2980 | #endif // PRODUCT |
ysr@777 | 2981 | |
johnc@3463 | 2982 | // Aggregate the counting data that was constructed concurrently |
johnc@3463 | 2983 | // with marking. |
johnc@3463 | 2984 | class AggregateCountDataHRClosure: public HeapRegionClosure { |
johnc@4123 | 2985 | G1CollectedHeap* _g1h; |
johnc@3463 | 2986 | ConcurrentMark* _cm; |
johnc@4123 | 2987 | CardTableModRefBS* _ct_bs; |
johnc@3463 | 2988 | BitMap* _cm_card_bm; |
johnc@4173 | 2989 | uint _max_worker_id; |
johnc@3463 | 2990 | |
johnc@3463 | 2991 | public: |
johnc@4123 | 2992 | AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
johnc@3463 | 2993 | BitMap* cm_card_bm, |
johnc@4173 | 2994 | uint max_worker_id) : |
johnc@4123 | 2995 | _g1h(g1h), _cm(g1h->concurrent_mark()), |
johnc@4123 | 2996 | _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
johnc@4173 | 2997 | _cm_card_bm(cm_card_bm), _max_worker_id(max_worker_id) { } |
johnc@3463 | 2998 | |
johnc@3463 | 2999 | bool doHeapRegion(HeapRegion* hr) { |
johnc@3463 | 3000 | if (hr->continuesHumongous()) { |
johnc@3463 | 3001 | // We will ignore these here and process them when their |
johnc@3463 | 3002 | // associated "starts humongous" region is processed. |
johnc@3463 | 3003 | // Note that we cannot rely on their associated |
johnc@3463 | 3004 | // "starts humongous" region to have their bit set to 1 |
johnc@3463 | 3005 | // since, due to the region chunking in the parallel region |
johnc@3463 | 3006 | // iteration, a "continues humongous" region might be visited |
johnc@3463 | 3007 | // before its associated "starts humongous". |
johnc@3463 | 3008 | return false; |
johnc@3463 | 3009 | } |
johnc@3463 | 3010 | |
johnc@3463 | 3011 | HeapWord* start = hr->bottom(); |
johnc@3463 | 3012 | HeapWord* limit = hr->next_top_at_mark_start(); |
johnc@3463 | 3013 | HeapWord* end = hr->end(); |
johnc@3463 | 3014 | |
johnc@3463 | 3015 | assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
johnc@3463 | 3016 | err_msg("Preconditions not met - " |
johnc@3463 | 3017 | "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
johnc@3463 | 3018 | "top: "PTR_FORMAT", end: "PTR_FORMAT, |
johnc@3463 | 3019 | start, limit, hr->top(), hr->end())); |
johnc@3463 | 3020 | |
johnc@3463 | 3021 | assert(hr->next_marked_bytes() == 0, "Precondition"); |
johnc@3463 | 3022 | |
johnc@3463 | 3023 | if (start == limit) { |
johnc@3463 | 3024 | // NTAMS of this region has not been set so nothing to do. |
johnc@3463 | 3025 | return false; |
johnc@3463 | 3026 | } |
johnc@3463 | 3027 | |
johnc@4123 | 3028 | // 'start' should be in the heap. |
johnc@4123 | 3029 | assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
johnc@4123 | 3030 | // 'end' *may* be just beyone the end of the heap (if hr is the last region) |
johnc@4123 | 3031 | assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
johnc@3463 | 3032 | |
johnc@3463 | 3033 | BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
johnc@3463 | 3034 | BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
johnc@3463 | 3035 | BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
johnc@3463 | 3036 | |
johnc@4123 | 3037 | // If ntams is not card aligned then we bump card bitmap index |
johnc@4123 | 3038 | // for limit so that we get the all the cards spanned by |
johnc@4123 | 3039 | // the object ending at ntams. |
johnc@4123 | 3040 | // Note: if this is the last region in the heap then ntams |
johnc@4123 | 3041 | // could be actually just beyond the end of the the heap; |
johnc@4123 | 3042 | // limit_idx will then correspond to a (non-existent) card |
johnc@4123 | 3043 | // that is also outside the heap. |
johnc@4123 | 3044 | if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
johnc@3463 | 3045 | limit_idx += 1; |
johnc@3463 | 3046 | } |
johnc@3463 | 3047 | |
johnc@3463 | 3048 | assert(limit_idx <= end_idx, "or else use atomics"); |
johnc@3463 | 3049 | |
johnc@3463 | 3050 | // Aggregate the "stripe" in the count data associated with hr. |
tonyp@3713 | 3051 | uint hrs_index = hr->hrs_index(); |
johnc@3463 | 3052 | size_t marked_bytes = 0; |
johnc@3463 | 3053 | |
johnc@4173 | 3054 | for (uint i = 0; i < _max_worker_id; i += 1) { |
johnc@3463 | 3055 | size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
johnc@3463 | 3056 | BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
johnc@3463 | 3057 | |
johnc@3463 | 3058 | // Fetch the marked_bytes in this region for task i and |
johnc@3463 | 3059 | // add it to the running total for this region. |
johnc@3463 | 3060 | marked_bytes += marked_bytes_array[hrs_index]; |
johnc@3463 | 3061 | |
johnc@4173 | 3062 | // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
johnc@3463 | 3063 | // into the global card bitmap. |
johnc@3463 | 3064 | BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
johnc@3463 | 3065 | |
johnc@3463 | 3066 | while (scan_idx < limit_idx) { |
johnc@3463 | 3067 | assert(task_card_bm->at(scan_idx) == true, "should be"); |
johnc@3463 | 3068 | _cm_card_bm->set_bit(scan_idx); |
johnc@3463 | 3069 | assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
johnc@3463 | 3070 | |
johnc@3463 | 3071 | // BitMap::get_next_one_offset() can handle the case when |
johnc@3463 | 3072 | // its left_offset parameter is greater than its right_offset |
johnc@4123 | 3073 | // parameter. It does, however, have an early exit if |
johnc@3463 | 3074 | // left_offset == right_offset. So let's limit the value |
johnc@3463 | 3075 | // passed in for left offset here. |
johnc@3463 | 3076 | BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
johnc@3463 | 3077 | scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
johnc@3463 | 3078 | } |
johnc@3463 | 3079 | } |
johnc@3463 | 3080 | |
johnc@3463 | 3081 | // Update the marked bytes for this region. |
johnc@3463 | 3082 | hr->add_to_marked_bytes(marked_bytes); |
johnc@3463 | 3083 | |
johnc@3463 | 3084 | // Next heap region |
johnc@3463 | 3085 | return false; |
johnc@3463 | 3086 | } |
johnc@3463 | 3087 | }; |
johnc@3463 | 3088 | |
johnc@3463 | 3089 | class G1AggregateCountDataTask: public AbstractGangTask { |
johnc@3463 | 3090 | protected: |
johnc@3463 | 3091 | G1CollectedHeap* _g1h; |
johnc@3463 | 3092 | ConcurrentMark* _cm; |
johnc@3463 | 3093 | BitMap* _cm_card_bm; |
johnc@4173 | 3094 | uint _max_worker_id; |
johnc@3463 | 3095 | int _active_workers; |
johnc@3463 | 3096 | |
johnc@3463 | 3097 | public: |
johnc@3463 | 3098 | G1AggregateCountDataTask(G1CollectedHeap* g1h, |
johnc@3463 | 3099 | ConcurrentMark* cm, |
johnc@3463 | 3100 | BitMap* cm_card_bm, |
johnc@4173 | 3101 | uint max_worker_id, |
johnc@3463 | 3102 | int n_workers) : |
johnc@3463 | 3103 | AbstractGangTask("Count Aggregation"), |
johnc@3463 | 3104 | _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
johnc@4173 | 3105 | _max_worker_id(max_worker_id), |
johnc@3463 | 3106 | _active_workers(n_workers) { } |
johnc@3463 | 3107 | |
johnc@3463 | 3108 | void work(uint worker_id) { |
johnc@4173 | 3109 | AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
johnc@3463 | 3110 | |
johnc@3463 | 3111 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@3463 | 3112 | _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
johnc@3463 | 3113 | _active_workers, |
johnc@3463 | 3114 | HeapRegion::AggregateCountClaimValue); |
johnc@3463 | 3115 | } else { |
johnc@3463 | 3116 | _g1h->heap_region_iterate(&cl); |
johnc@3463 | 3117 | } |
johnc@3463 | 3118 | } |
johnc@3463 | 3119 | }; |
johnc@3463 | 3120 | |
johnc@3463 | 3121 | |
johnc@3463 | 3122 | void ConcurrentMark::aggregate_count_data() { |
johnc@3463 | 3123 | int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
johnc@3463 | 3124 | _g1h->workers()->active_workers() : |
johnc@3463 | 3125 | 1); |
johnc@3463 | 3126 | |
johnc@3463 | 3127 | G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
johnc@4173 | 3128 | _max_worker_id, n_workers); |
johnc@3463 | 3129 | |
johnc@3463 | 3130 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@3463 | 3131 | assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
johnc@3463 | 3132 | "sanity check"); |
johnc@3463 | 3133 | _g1h->set_par_threads(n_workers); |
johnc@3463 | 3134 | _g1h->workers()->run_task(&g1_par_agg_task); |
johnc@3463 | 3135 | _g1h->set_par_threads(0); |
johnc@3463 | 3136 | |
johnc@3463 | 3137 | assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
johnc@3463 | 3138 | "sanity check"); |
johnc@3463 | 3139 | _g1h->reset_heap_region_claim_values(); |
johnc@3463 | 3140 | } else { |
johnc@3463 | 3141 | g1_par_agg_task.work(0); |
johnc@3463 | 3142 | } |
johnc@3463 | 3143 | } |
johnc@3463 | 3144 | |
johnc@3463 | 3145 | // Clear the per-worker arrays used to store the per-region counting data |
johnc@3463 | 3146 | void ConcurrentMark::clear_all_count_data() { |
johnc@3463 | 3147 | // Clear the global card bitmap - it will be filled during |
johnc@3463 | 3148 | // liveness count aggregation (during remark) and the |
johnc@3463 | 3149 | // final counting task. |
johnc@3463 | 3150 | _card_bm.clear(); |
johnc@3463 | 3151 | |
johnc@3463 | 3152 | // Clear the global region bitmap - it will be filled as part |
johnc@3463 | 3153 | // of the final counting task. |
johnc@3463 | 3154 | _region_bm.clear(); |
johnc@3463 | 3155 | |
tonyp@3713 | 3156 | uint max_regions = _g1h->max_regions(); |
johnc@4173 | 3157 | assert(_max_worker_id > 0, "uninitialized"); |
johnc@4173 | 3158 | |
johnc@4173 | 3159 | for (uint i = 0; i < _max_worker_id; i += 1) { |
johnc@3463 | 3160 | BitMap* task_card_bm = count_card_bitmap_for(i); |
johnc@3463 | 3161 | size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
johnc@3463 | 3162 | |
johnc@3463 | 3163 | assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
johnc@3463 | 3164 | assert(marked_bytes_array != NULL, "uninitialized"); |
johnc@3463 | 3165 | |
tonyp@3713 | 3166 | memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
johnc@3463 | 3167 | task_card_bm->clear(); |
johnc@3463 | 3168 | } |
johnc@3463 | 3169 | } |
johnc@3463 | 3170 | |
ysr@777 | 3171 | void ConcurrentMark::print_stats() { |
ysr@777 | 3172 | if (verbose_stats()) { |
ysr@777 | 3173 | gclog_or_tty->print_cr("---------------------------------------------------------------------"); |
ysr@777 | 3174 | for (size_t i = 0; i < _active_tasks; ++i) { |
ysr@777 | 3175 | _tasks[i]->print_stats(); |
ysr@777 | 3176 | gclog_or_tty->print_cr("---------------------------------------------------------------------"); |
ysr@777 | 3177 | } |
ysr@777 | 3178 | } |
ysr@777 | 3179 | } |
ysr@777 | 3180 | |
ysr@777 | 3181 | // abandon current marking iteration due to a Full GC |
ysr@777 | 3182 | void ConcurrentMark::abort() { |
ysr@777 | 3183 | // Clear all marks to force marking thread to do nothing |
ysr@777 | 3184 | _nextMarkBitMap->clearAll(); |
johnc@3463 | 3185 | // Clear the liveness counting data |
johnc@3463 | 3186 | clear_all_count_data(); |
ysr@777 | 3187 | // Empty mark stack |
johnc@4386 | 3188 | reset_marking_state(); |
johnc@4173 | 3189 | for (uint i = 0; i < _max_worker_id; ++i) { |
ysr@777 | 3190 | _tasks[i]->clear_region_fields(); |
johnc@2190 | 3191 | } |
ysr@777 | 3192 | _has_aborted = true; |
ysr@777 | 3193 | |
ysr@777 | 3194 | SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
ysr@777 | 3195 | satb_mq_set.abandon_partial_marking(); |
tonyp@1752 | 3196 | // This can be called either during or outside marking, we'll read |
tonyp@1752 | 3197 | // the expected_active value from the SATB queue set. |
tonyp@1752 | 3198 | satb_mq_set.set_active_all_threads( |
tonyp@1752 | 3199 | false, /* new active value */ |
tonyp@1752 | 3200 | satb_mq_set.is_active() /* expected_active */); |
ysr@777 | 3201 | } |
ysr@777 | 3202 | |
ysr@777 | 3203 | static void print_ms_time_info(const char* prefix, const char* name, |
ysr@777 | 3204 | NumberSeq& ns) { |
ysr@777 | 3205 | gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", |
ysr@777 | 3206 | prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); |
ysr@777 | 3207 | if (ns.num() > 0) { |
ysr@777 | 3208 | gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", |
ysr@777 | 3209 | prefix, ns.sd(), ns.maximum()); |
ysr@777 | 3210 | } |
ysr@777 | 3211 | } |
ysr@777 | 3212 | |
ysr@777 | 3213 | void ConcurrentMark::print_summary_info() { |
ysr@777 | 3214 | gclog_or_tty->print_cr(" Concurrent marking:"); |
ysr@777 | 3215 | print_ms_time_info(" ", "init marks", _init_times); |
ysr@777 | 3216 | print_ms_time_info(" ", "remarks", _remark_times); |
ysr@777 | 3217 | { |
ysr@777 | 3218 | print_ms_time_info(" ", "final marks", _remark_mark_times); |
ysr@777 | 3219 | print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); |
ysr@777 | 3220 | |
ysr@777 | 3221 | } |
ysr@777 | 3222 | print_ms_time_info(" ", "cleanups", _cleanup_times); |
ysr@777 | 3223 | gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", |
ysr@777 | 3224 | _total_counting_time, |
ysr@777 | 3225 | (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / |
ysr@777 | 3226 | (double)_cleanup_times.num() |
ysr@777 | 3227 | : 0.0)); |
ysr@777 | 3228 | if (G1ScrubRemSets) { |
ysr@777 | 3229 | gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", |
ysr@777 | 3230 | _total_rs_scrub_time, |
ysr@777 | 3231 | (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / |
ysr@777 | 3232 | (double)_cleanup_times.num() |
ysr@777 | 3233 | : 0.0)); |
ysr@777 | 3234 | } |
ysr@777 | 3235 | gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", |
ysr@777 | 3236 | (_init_times.sum() + _remark_times.sum() + |
ysr@777 | 3237 | _cleanup_times.sum())/1000.0); |
ysr@777 | 3238 | gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " |
johnc@3463 | 3239 | "(%8.2f s marking).", |
ysr@777 | 3240 | cmThread()->vtime_accum(), |
johnc@3463 | 3241 | cmThread()->vtime_mark_accum()); |
ysr@777 | 3242 | } |
ysr@777 | 3243 | |
tonyp@1454 | 3244 | void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
tonyp@1454 | 3245 | _parallel_workers->print_worker_threads_on(st); |
tonyp@1454 | 3246 | } |
tonyp@1454 | 3247 | |
ysr@777 | 3248 | // We take a break if someone is trying to stop the world. |
jmasa@3357 | 3249 | bool ConcurrentMark::do_yield_check(uint worker_id) { |
ysr@777 | 3250 | if (should_yield()) { |
jmasa@3357 | 3251 | if (worker_id == 0) { |
ysr@777 | 3252 | _g1h->g1_policy()->record_concurrent_pause(); |
tonyp@2973 | 3253 | } |
ysr@777 | 3254 | cmThread()->yield(); |
ysr@777 | 3255 | return true; |
ysr@777 | 3256 | } else { |
ysr@777 | 3257 | return false; |
ysr@777 | 3258 | } |
ysr@777 | 3259 | } |
ysr@777 | 3260 | |
ysr@777 | 3261 | bool ConcurrentMark::should_yield() { |
ysr@777 | 3262 | return cmThread()->should_yield(); |
ysr@777 | 3263 | } |
ysr@777 | 3264 | |
ysr@777 | 3265 | bool ConcurrentMark::containing_card_is_marked(void* p) { |
ysr@777 | 3266 | size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); |
ysr@777 | 3267 | return _card_bm.at(offset >> CardTableModRefBS::card_shift); |
ysr@777 | 3268 | } |
ysr@777 | 3269 | |
ysr@777 | 3270 | bool ConcurrentMark::containing_cards_are_marked(void* start, |
ysr@777 | 3271 | void* last) { |
tonyp@2973 | 3272 | return containing_card_is_marked(start) && |
tonyp@2973 | 3273 | containing_card_is_marked(last); |
ysr@777 | 3274 | } |
ysr@777 | 3275 | |
ysr@777 | 3276 | #ifndef PRODUCT |
ysr@777 | 3277 | // for debugging purposes |
ysr@777 | 3278 | void ConcurrentMark::print_finger() { |
ysr@777 | 3279 | gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, |
ysr@777 | 3280 | _heap_start, _heap_end, _finger); |
johnc@4173 | 3281 | for (uint i = 0; i < _max_worker_id; ++i) { |
johnc@4173 | 3282 | gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
ysr@777 | 3283 | } |
ysr@777 | 3284 | gclog_or_tty->print_cr(""); |
ysr@777 | 3285 | } |
ysr@777 | 3286 | #endif |
ysr@777 | 3287 | |
tonyp@2968 | 3288 | void CMTask::scan_object(oop obj) { |
tonyp@2968 | 3289 | assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); |
tonyp@2968 | 3290 | |
tonyp@2968 | 3291 | if (_cm->verbose_high()) { |
johnc@4173 | 3292 | gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
johnc@4173 | 3293 | _worker_id, (void*) obj); |
tonyp@2968 | 3294 | } |
tonyp@2968 | 3295 | |
tonyp@2968 | 3296 | size_t obj_size = obj->size(); |
tonyp@2968 | 3297 | _words_scanned += obj_size; |
tonyp@2968 | 3298 | |
tonyp@2968 | 3299 | obj->oop_iterate(_cm_oop_closure); |
tonyp@2968 | 3300 | statsOnly( ++_objs_scanned ); |
tonyp@2968 | 3301 | check_limits(); |
tonyp@2968 | 3302 | } |
tonyp@2968 | 3303 | |
ysr@777 | 3304 | // Closure for iteration over bitmaps |
ysr@777 | 3305 | class CMBitMapClosure : public BitMapClosure { |
ysr@777 | 3306 | private: |
ysr@777 | 3307 | // the bitmap that is being iterated over |
ysr@777 | 3308 | CMBitMap* _nextMarkBitMap; |
ysr@777 | 3309 | ConcurrentMark* _cm; |
ysr@777 | 3310 | CMTask* _task; |
ysr@777 | 3311 | |
ysr@777 | 3312 | public: |
tonyp@3691 | 3313 | CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
tonyp@3691 | 3314 | _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
ysr@777 | 3315 | |
ysr@777 | 3316 | bool do_bit(size_t offset) { |
ysr@777 | 3317 | HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); |
tonyp@1458 | 3318 | assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
tonyp@1458 | 3319 | assert( addr < _cm->finger(), "invariant"); |
ysr@777 | 3320 | |
tonyp@3691 | 3321 | statsOnly( _task->increase_objs_found_on_bitmap() ); |
tonyp@3691 | 3322 | assert(addr >= _task->finger(), "invariant"); |
tonyp@3691 | 3323 | |
tonyp@3691 | 3324 | // We move that task's local finger along. |
tonyp@3691 | 3325 | _task->move_finger_to(addr); |
ysr@777 | 3326 | |
ysr@777 | 3327 | _task->scan_object(oop(addr)); |
ysr@777 | 3328 | // we only partially drain the local queue and global stack |
ysr@777 | 3329 | _task->drain_local_queue(true); |
ysr@777 | 3330 | _task->drain_global_stack(true); |
ysr@777 | 3331 | |
ysr@777 | 3332 | // if the has_aborted flag has been raised, we need to bail out of |
ysr@777 | 3333 | // the iteration |
ysr@777 | 3334 | return !_task->has_aborted(); |
ysr@777 | 3335 | } |
ysr@777 | 3336 | }; |
ysr@777 | 3337 | |
ysr@777 | 3338 | // Closure for iterating over objects, currently only used for |
ysr@777 | 3339 | // processing SATB buffers. |
ysr@777 | 3340 | class CMObjectClosure : public ObjectClosure { |
ysr@777 | 3341 | private: |
ysr@777 | 3342 | CMTask* _task; |
ysr@777 | 3343 | |
ysr@777 | 3344 | public: |
ysr@777 | 3345 | void do_object(oop obj) { |
ysr@777 | 3346 | _task->deal_with_reference(obj); |
ysr@777 | 3347 | } |
ysr@777 | 3348 | |
ysr@777 | 3349 | CMObjectClosure(CMTask* task) : _task(task) { } |
ysr@777 | 3350 | }; |
ysr@777 | 3351 | |
tonyp@2968 | 3352 | G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
tonyp@2968 | 3353 | ConcurrentMark* cm, |
tonyp@2968 | 3354 | CMTask* task) |
tonyp@2968 | 3355 | : _g1h(g1h), _cm(cm), _task(task) { |
tonyp@2968 | 3356 | assert(_ref_processor == NULL, "should be initialized to NULL"); |
tonyp@2968 | 3357 | |
tonyp@2968 | 3358 | if (G1UseConcMarkReferenceProcessing) { |
johnc@3175 | 3359 | _ref_processor = g1h->ref_processor_cm(); |
tonyp@2968 | 3360 | assert(_ref_processor != NULL, "should not be NULL"); |
ysr@777 | 3361 | } |
tonyp@2968 | 3362 | } |
ysr@777 | 3363 | |
ysr@777 | 3364 | void CMTask::setup_for_region(HeapRegion* hr) { |
tonyp@1458 | 3365 | // Separated the asserts so that we know which one fires. |
tonyp@1458 | 3366 | assert(hr != NULL, |
tonyp@1458 | 3367 | "claim_region() should have filtered out continues humongous regions"); |
tonyp@1458 | 3368 | assert(!hr->continuesHumongous(), |
tonyp@1458 | 3369 | "claim_region() should have filtered out continues humongous regions"); |
ysr@777 | 3370 | |
tonyp@2973 | 3371 | if (_cm->verbose_low()) { |
johnc@4173 | 3372 | gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
johnc@4173 | 3373 | _worker_id, hr); |
tonyp@2973 | 3374 | } |
ysr@777 | 3375 | |
ysr@777 | 3376 | _curr_region = hr; |
ysr@777 | 3377 | _finger = hr->bottom(); |
ysr@777 | 3378 | update_region_limit(); |
ysr@777 | 3379 | } |
ysr@777 | 3380 | |
ysr@777 | 3381 | void CMTask::update_region_limit() { |
ysr@777 | 3382 | HeapRegion* hr = _curr_region; |
ysr@777 | 3383 | HeapWord* bottom = hr->bottom(); |
ysr@777 | 3384 | HeapWord* limit = hr->next_top_at_mark_start(); |
ysr@777 | 3385 | |
ysr@777 | 3386 | if (limit == bottom) { |
tonyp@2973 | 3387 | if (_cm->verbose_low()) { |
johnc@4173 | 3388 | gclog_or_tty->print_cr("[%u] found an empty region " |
ysr@777 | 3389 | "["PTR_FORMAT", "PTR_FORMAT")", |
johnc@4173 | 3390 | _worker_id, bottom, limit); |
tonyp@2973 | 3391 | } |
ysr@777 | 3392 | // The region was collected underneath our feet. |
ysr@777 | 3393 | // We set the finger to bottom to ensure that the bitmap |
ysr@777 | 3394 | // iteration that will follow this will not do anything. |
ysr@777 | 3395 | // (this is not a condition that holds when we set the region up, |
ysr@777 | 3396 | // as the region is not supposed to be empty in the first place) |
ysr@777 | 3397 | _finger = bottom; |
ysr@777 | 3398 | } else if (limit >= _region_limit) { |
tonyp@1458 | 3399 | assert(limit >= _finger, "peace of mind"); |
ysr@777 | 3400 | } else { |
tonyp@1458 | 3401 | assert(limit < _region_limit, "only way to get here"); |
ysr@777 | 3402 | // This can happen under some pretty unusual circumstances. An |
ysr@777 | 3403 | // evacuation pause empties the region underneath our feet (NTAMS |
ysr@777 | 3404 | // at bottom). We then do some allocation in the region (NTAMS |
ysr@777 | 3405 | // stays at bottom), followed by the region being used as a GC |
ysr@777 | 3406 | // alloc region (NTAMS will move to top() and the objects |
ysr@777 | 3407 | // originally below it will be grayed). All objects now marked in |
ysr@777 | 3408 | // the region are explicitly grayed, if below the global finger, |
ysr@777 | 3409 | // and we do not need in fact to scan anything else. So, we simply |
ysr@777 | 3410 | // set _finger to be limit to ensure that the bitmap iteration |
ysr@777 | 3411 | // doesn't do anything. |
ysr@777 | 3412 | _finger = limit; |
ysr@777 | 3413 | } |
ysr@777 | 3414 | |
ysr@777 | 3415 | _region_limit = limit; |
ysr@777 | 3416 | } |
ysr@777 | 3417 | |
ysr@777 | 3418 | void CMTask::giveup_current_region() { |
tonyp@1458 | 3419 | assert(_curr_region != NULL, "invariant"); |
tonyp@2973 | 3420 | if (_cm->verbose_low()) { |
johnc@4173 | 3421 | gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
johnc@4173 | 3422 | _worker_id, _curr_region); |
tonyp@2973 | 3423 | } |
ysr@777 | 3424 | clear_region_fields(); |
ysr@777 | 3425 | } |
ysr@777 | 3426 | |
ysr@777 | 3427 | void CMTask::clear_region_fields() { |
ysr@777 | 3428 | // Values for these three fields that indicate that we're not |
ysr@777 | 3429 | // holding on to a region. |
ysr@777 | 3430 | _curr_region = NULL; |
ysr@777 | 3431 | _finger = NULL; |
ysr@777 | 3432 | _region_limit = NULL; |
ysr@777 | 3433 | } |
ysr@777 | 3434 | |
tonyp@2968 | 3435 | void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
tonyp@2968 | 3436 | if (cm_oop_closure == NULL) { |
tonyp@2968 | 3437 | assert(_cm_oop_closure != NULL, "invariant"); |
tonyp@2968 | 3438 | } else { |
tonyp@2968 | 3439 | assert(_cm_oop_closure == NULL, "invariant"); |
tonyp@2968 | 3440 | } |
tonyp@2968 | 3441 | _cm_oop_closure = cm_oop_closure; |
tonyp@2968 | 3442 | } |
tonyp@2968 | 3443 | |
ysr@777 | 3444 | void CMTask::reset(CMBitMap* nextMarkBitMap) { |
tonyp@1458 | 3445 | guarantee(nextMarkBitMap != NULL, "invariant"); |
ysr@777 | 3446 | |
tonyp@2973 | 3447 | if (_cm->verbose_low()) { |
johnc@4173 | 3448 | gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
tonyp@2973 | 3449 | } |
ysr@777 | 3450 | |
ysr@777 | 3451 | _nextMarkBitMap = nextMarkBitMap; |
ysr@777 | 3452 | clear_region_fields(); |
ysr@777 | 3453 | |
ysr@777 | 3454 | _calls = 0; |
ysr@777 | 3455 | _elapsed_time_ms = 0.0; |
ysr@777 | 3456 | _termination_time_ms = 0.0; |
ysr@777 | 3457 | _termination_start_time_ms = 0.0; |
ysr@777 | 3458 | |
ysr@777 | 3459 | #if _MARKING_STATS_ |
ysr@777 | 3460 | _local_pushes = 0; |
ysr@777 | 3461 | _local_pops = 0; |
ysr@777 | 3462 | _local_max_size = 0; |
ysr@777 | 3463 | _objs_scanned = 0; |
ysr@777 | 3464 | _global_pushes = 0; |
ysr@777 | 3465 | _global_pops = 0; |
ysr@777 | 3466 | _global_max_size = 0; |
ysr@777 | 3467 | _global_transfers_to = 0; |
ysr@777 | 3468 | _global_transfers_from = 0; |
ysr@777 | 3469 | _regions_claimed = 0; |
ysr@777 | 3470 | _objs_found_on_bitmap = 0; |
ysr@777 | 3471 | _satb_buffers_processed = 0; |
ysr@777 | 3472 | _steal_attempts = 0; |
ysr@777 | 3473 | _steals = 0; |
ysr@777 | 3474 | _aborted = 0; |
ysr@777 | 3475 | _aborted_overflow = 0; |
ysr@777 | 3476 | _aborted_cm_aborted = 0; |
ysr@777 | 3477 | _aborted_yield = 0; |
ysr@777 | 3478 | _aborted_timed_out = 0; |
ysr@777 | 3479 | _aborted_satb = 0; |
ysr@777 | 3480 | _aborted_termination = 0; |
ysr@777 | 3481 | #endif // _MARKING_STATS_ |
ysr@777 | 3482 | } |
ysr@777 | 3483 | |
ysr@777 | 3484 | bool CMTask::should_exit_termination() { |
ysr@777 | 3485 | regular_clock_call(); |
ysr@777 | 3486 | // This is called when we are in the termination protocol. We should |
ysr@777 | 3487 | // quit if, for some reason, this task wants to abort or the global |
ysr@777 | 3488 | // stack is not empty (this means that we can get work from it). |
ysr@777 | 3489 | return !_cm->mark_stack_empty() || has_aborted(); |
ysr@777 | 3490 | } |
ysr@777 | 3491 | |
ysr@777 | 3492 | void CMTask::reached_limit() { |
tonyp@1458 | 3493 | assert(_words_scanned >= _words_scanned_limit || |
tonyp@1458 | 3494 | _refs_reached >= _refs_reached_limit , |
tonyp@1458 | 3495 | "shouldn't have been called otherwise"); |
ysr@777 | 3496 | regular_clock_call(); |
ysr@777 | 3497 | } |
ysr@777 | 3498 | |
ysr@777 | 3499 | void CMTask::regular_clock_call() { |
tonyp@2973 | 3500 | if (has_aborted()) return; |
ysr@777 | 3501 | |
ysr@777 | 3502 | // First, we need to recalculate the words scanned and refs reached |
ysr@777 | 3503 | // limits for the next clock call. |
ysr@777 | 3504 | recalculate_limits(); |
ysr@777 | 3505 | |
ysr@777 | 3506 | // During the regular clock call we do the following |
ysr@777 | 3507 | |
ysr@777 | 3508 | // (1) If an overflow has been flagged, then we abort. |
ysr@777 | 3509 | if (_cm->has_overflown()) { |
ysr@777 | 3510 | set_has_aborted(); |
ysr@777 | 3511 | return; |
ysr@777 | 3512 | } |
ysr@777 | 3513 | |
ysr@777 | 3514 | // If we are not concurrent (i.e. we're doing remark) we don't need |
ysr@777 | 3515 | // to check anything else. The other steps are only needed during |
ysr@777 | 3516 | // the concurrent marking phase. |
tonyp@2973 | 3517 | if (!concurrent()) return; |
ysr@777 | 3518 | |
ysr@777 | 3519 | // (2) If marking has been aborted for Full GC, then we also abort. |
ysr@777 | 3520 | if (_cm->has_aborted()) { |
ysr@777 | 3521 | set_has_aborted(); |
ysr@777 | 3522 | statsOnly( ++_aborted_cm_aborted ); |
ysr@777 | 3523 | return; |
ysr@777 | 3524 | } |
ysr@777 | 3525 | |
ysr@777 | 3526 | double curr_time_ms = os::elapsedVTime() * 1000.0; |
ysr@777 | 3527 | |
ysr@777 | 3528 | // (3) If marking stats are enabled, then we update the step history. |
ysr@777 | 3529 | #if _MARKING_STATS_ |
tonyp@2973 | 3530 | if (_words_scanned >= _words_scanned_limit) { |
ysr@777 | 3531 | ++_clock_due_to_scanning; |
tonyp@2973 | 3532 | } |
tonyp@2973 | 3533 | if (_refs_reached >= _refs_reached_limit) { |
ysr@777 | 3534 | ++_clock_due_to_marking; |
tonyp@2973 | 3535 | } |
ysr@777 | 3536 | |
ysr@777 | 3537 | double last_interval_ms = curr_time_ms - _interval_start_time_ms; |
ysr@777 | 3538 | _interval_start_time_ms = curr_time_ms; |
ysr@777 | 3539 | _all_clock_intervals_ms.add(last_interval_ms); |
ysr@777 | 3540 | |
ysr@777 | 3541 | if (_cm->verbose_medium()) { |
johnc@4173 | 3542 | gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
tonyp@2973 | 3543 | "scanned = %d%s, refs reached = %d%s", |
johnc@4173 | 3544 | _worker_id, last_interval_ms, |
tonyp@2973 | 3545 | _words_scanned, |
tonyp@2973 | 3546 | (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
tonyp@2973 | 3547 | _refs_reached, |
tonyp@2973 | 3548 | (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
ysr@777 | 3549 | } |
ysr@777 | 3550 | #endif // _MARKING_STATS_ |
ysr@777 | 3551 | |
ysr@777 | 3552 | // (4) We check whether we should yield. If we have to, then we abort. |
ysr@777 | 3553 | if (_cm->should_yield()) { |
ysr@777 | 3554 | // We should yield. To do this we abort the task. The caller is |
ysr@777 | 3555 | // responsible for yielding. |
ysr@777 | 3556 | set_has_aborted(); |
ysr@777 | 3557 | statsOnly( ++_aborted_yield ); |
ysr@777 | 3558 | return; |
ysr@777 | 3559 | } |
ysr@777 | 3560 | |
ysr@777 | 3561 | // (5) We check whether we've reached our time quota. If we have, |
ysr@777 | 3562 | // then we abort. |
ysr@777 | 3563 | double elapsed_time_ms = curr_time_ms - _start_time_ms; |
ysr@777 | 3564 | if (elapsed_time_ms > _time_target_ms) { |
ysr@777 | 3565 | set_has_aborted(); |
johnc@2494 | 3566 | _has_timed_out = true; |
ysr@777 | 3567 | statsOnly( ++_aborted_timed_out ); |
ysr@777 | 3568 | return; |
ysr@777 | 3569 | } |
ysr@777 | 3570 | |
ysr@777 | 3571 | // (6) Finally, we check whether there are enough completed STAB |
ysr@777 | 3572 | // buffers available for processing. If there are, we abort. |
ysr@777 | 3573 | SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
ysr@777 | 3574 | if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { |
tonyp@2973 | 3575 | if (_cm->verbose_low()) { |
johnc@4173 | 3576 | gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
johnc@4173 | 3577 | _worker_id); |
tonyp@2973 | 3578 | } |
ysr@777 | 3579 | // we do need to process SATB buffers, we'll abort and restart |
ysr@777 | 3580 | // the marking task to do so |
ysr@777 | 3581 | set_has_aborted(); |
ysr@777 | 3582 | statsOnly( ++_aborted_satb ); |
ysr@777 | 3583 | return; |
ysr@777 | 3584 | } |
ysr@777 | 3585 | } |
ysr@777 | 3586 | |
ysr@777 | 3587 | void CMTask::recalculate_limits() { |
ysr@777 | 3588 | _real_words_scanned_limit = _words_scanned + words_scanned_period; |
ysr@777 | 3589 | _words_scanned_limit = _real_words_scanned_limit; |
ysr@777 | 3590 | |
ysr@777 | 3591 | _real_refs_reached_limit = _refs_reached + refs_reached_period; |
ysr@777 | 3592 | _refs_reached_limit = _real_refs_reached_limit; |
ysr@777 | 3593 | } |
ysr@777 | 3594 | |
ysr@777 | 3595 | void CMTask::decrease_limits() { |
ysr@777 | 3596 | // This is called when we believe that we're going to do an infrequent |
ysr@777 | 3597 | // operation which will increase the per byte scanned cost (i.e. move |
ysr@777 | 3598 | // entries to/from the global stack). It basically tries to decrease the |
ysr@777 | 3599 | // scanning limit so that the clock is called earlier. |
ysr@777 | 3600 | |
tonyp@2973 | 3601 | if (_cm->verbose_medium()) { |
johnc@4173 | 3602 | gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
tonyp@2973 | 3603 | } |
ysr@777 | 3604 | |
ysr@777 | 3605 | _words_scanned_limit = _real_words_scanned_limit - |
ysr@777 | 3606 | 3 * words_scanned_period / 4; |
ysr@777 | 3607 | _refs_reached_limit = _real_refs_reached_limit - |
ysr@777 | 3608 | 3 * refs_reached_period / 4; |
ysr@777 | 3609 | } |
ysr@777 | 3610 | |
ysr@777 | 3611 | void CMTask::move_entries_to_global_stack() { |
ysr@777 | 3612 | // local array where we'll store the entries that will be popped |
ysr@777 | 3613 | // from the local queue |
ysr@777 | 3614 | oop buffer[global_stack_transfer_size]; |
ysr@777 | 3615 | |
ysr@777 | 3616 | int n = 0; |
ysr@777 | 3617 | oop obj; |
ysr@777 | 3618 | while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { |
ysr@777 | 3619 | buffer[n] = obj; |
ysr@777 | 3620 | ++n; |
ysr@777 | 3621 | } |
ysr@777 | 3622 | |
ysr@777 | 3623 | if (n > 0) { |
ysr@777 | 3624 | // we popped at least one entry from the local queue |
ysr@777 | 3625 | |
ysr@777 | 3626 | statsOnly( ++_global_transfers_to; _local_pops += n ); |
ysr@777 | 3627 | |
ysr@777 | 3628 | if (!_cm->mark_stack_push(buffer, n)) { |
tonyp@2973 | 3629 | if (_cm->verbose_low()) { |
johnc@4173 | 3630 | gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
johnc@4173 | 3631 | _worker_id); |
tonyp@2973 | 3632 | } |
ysr@777 | 3633 | set_has_aborted(); |
ysr@777 | 3634 | } else { |
ysr@777 | 3635 | // the transfer was successful |
ysr@777 | 3636 | |
tonyp@2973 | 3637 | if (_cm->verbose_medium()) { |
johnc@4173 | 3638 | gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
johnc@4173 | 3639 | _worker_id, n); |
tonyp@2973 | 3640 | } |
ysr@777 | 3641 | statsOnly( int tmp_size = _cm->mark_stack_size(); |
tonyp@2973 | 3642 | if (tmp_size > _global_max_size) { |
ysr@777 | 3643 | _global_max_size = tmp_size; |
tonyp@2973 | 3644 | } |
ysr@777 | 3645 | _global_pushes += n ); |
ysr@777 | 3646 | } |
ysr@777 | 3647 | } |
ysr@777 | 3648 | |
ysr@777 | 3649 | // this operation was quite expensive, so decrease the limits |
ysr@777 | 3650 | decrease_limits(); |
ysr@777 | 3651 | } |
ysr@777 | 3652 | |
ysr@777 | 3653 | void CMTask::get_entries_from_global_stack() { |
ysr@777 | 3654 | // local array where we'll store the entries that will be popped |
ysr@777 | 3655 | // from the global stack. |
ysr@777 | 3656 | oop buffer[global_stack_transfer_size]; |
ysr@777 | 3657 | int n; |
ysr@777 | 3658 | _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); |
tonyp@1458 | 3659 | assert(n <= global_stack_transfer_size, |
tonyp@1458 | 3660 | "we should not pop more than the given limit"); |
ysr@777 | 3661 | if (n > 0) { |
ysr@777 | 3662 | // yes, we did actually pop at least one entry |
ysr@777 | 3663 | |
ysr@777 | 3664 | statsOnly( ++_global_transfers_from; _global_pops += n ); |
tonyp@2973 | 3665 | if (_cm->verbose_medium()) { |
johnc@4173 | 3666 | gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
johnc@4173 | 3667 | _worker_id, n); |
tonyp@2973 | 3668 | } |
ysr@777 | 3669 | for (int i = 0; i < n; ++i) { |
ysr@777 | 3670 | bool success = _task_queue->push(buffer[i]); |
ysr@777 | 3671 | // We only call this when the local queue is empty or under a |
ysr@777 | 3672 | // given target limit. So, we do not expect this push to fail. |
tonyp@1458 | 3673 | assert(success, "invariant"); |
ysr@777 | 3674 | } |
ysr@777 | 3675 | |
ysr@777 | 3676 | statsOnly( int tmp_size = _task_queue->size(); |
tonyp@2973 | 3677 | if (tmp_size > _local_max_size) { |
ysr@777 | 3678 | _local_max_size = tmp_size; |
tonyp@2973 | 3679 | } |
ysr@777 | 3680 | _local_pushes += n ); |
ysr@777 | 3681 | } |
ysr@777 | 3682 | |
ysr@777 | 3683 | // this operation was quite expensive, so decrease the limits |
ysr@777 | 3684 | decrease_limits(); |
ysr@777 | 3685 | } |
ysr@777 | 3686 | |
ysr@777 | 3687 | void CMTask::drain_local_queue(bool partially) { |
tonyp@2973 | 3688 | if (has_aborted()) return; |
ysr@777 | 3689 | |
ysr@777 | 3690 | // Decide what the target size is, depending whether we're going to |
ysr@777 | 3691 | // drain it partially (so that other tasks can steal if they run out |
ysr@777 | 3692 | // of things to do) or totally (at the very end). |
ysr@777 | 3693 | size_t target_size; |
tonyp@2973 | 3694 | if (partially) { |
ysr@777 | 3695 | target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
tonyp@2973 | 3696 | } else { |
ysr@777 | 3697 | target_size = 0; |
tonyp@2973 | 3698 | } |
ysr@777 | 3699 | |
ysr@777 | 3700 | if (_task_queue->size() > target_size) { |
tonyp@2973 | 3701 | if (_cm->verbose_high()) { |
johnc@4173 | 3702 | gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
johnc@4173 | 3703 | _worker_id, target_size); |
tonyp@2973 | 3704 | } |
ysr@777 | 3705 | |
ysr@777 | 3706 | oop obj; |
ysr@777 | 3707 | bool ret = _task_queue->pop_local(obj); |
ysr@777 | 3708 | while (ret) { |
ysr@777 | 3709 | statsOnly( ++_local_pops ); |
ysr@777 | 3710 | |
tonyp@2973 | 3711 | if (_cm->verbose_high()) { |
johnc@4173 | 3712 | gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
ysr@777 | 3713 | (void*) obj); |
tonyp@2973 | 3714 | } |
ysr@777 | 3715 | |
tonyp@1458 | 3716 | assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
tonyp@2643 | 3717 | assert(!_g1h->is_on_master_free_list( |
tonyp@2472 | 3718 | _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
ysr@777 | 3719 | |
ysr@777 | 3720 | scan_object(obj); |
ysr@777 | 3721 | |
tonyp@2973 | 3722 | if (_task_queue->size() <= target_size || has_aborted()) { |
ysr@777 | 3723 | ret = false; |
tonyp@2973 | 3724 | } else { |
ysr@777 | 3725 | ret = _task_queue->pop_local(obj); |
tonyp@2973 | 3726 | } |
ysr@777 | 3727 | } |
ysr@777 | 3728 | |
tonyp@2973 | 3729 | if (_cm->verbose_high()) { |
johnc@4173 | 3730 | gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
johnc@4173 | 3731 | _worker_id, _task_queue->size()); |
tonyp@2973 | 3732 | } |
ysr@777 | 3733 | } |
ysr@777 | 3734 | } |
ysr@777 | 3735 | |
ysr@777 | 3736 | void CMTask::drain_global_stack(bool partially) { |
tonyp@2973 | 3737 | if (has_aborted()) return; |
ysr@777 | 3738 | |
ysr@777 | 3739 | // We have a policy to drain the local queue before we attempt to |
ysr@777 | 3740 | // drain the global stack. |
tonyp@1458 | 3741 | assert(partially || _task_queue->size() == 0, "invariant"); |
ysr@777 | 3742 | |
ysr@777 | 3743 | // Decide what the target size is, depending whether we're going to |
ysr@777 | 3744 | // drain it partially (so that other tasks can steal if they run out |
ysr@777 | 3745 | // of things to do) or totally (at the very end). Notice that, |
ysr@777 | 3746 | // because we move entries from the global stack in chunks or |
ysr@777 | 3747 | // because another task might be doing the same, we might in fact |
ysr@777 | 3748 | // drop below the target. But, this is not a problem. |
ysr@777 | 3749 | size_t target_size; |
tonyp@2973 | 3750 | if (partially) { |
ysr@777 | 3751 | target_size = _cm->partial_mark_stack_size_target(); |
tonyp@2973 | 3752 | } else { |
ysr@777 | 3753 | target_size = 0; |
tonyp@2973 | 3754 | } |
ysr@777 | 3755 | |
ysr@777 | 3756 | if (_cm->mark_stack_size() > target_size) { |
tonyp@2973 | 3757 | if (_cm->verbose_low()) { |
johnc@4173 | 3758 | gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
johnc@4173 | 3759 | _worker_id, target_size); |
tonyp@2973 | 3760 | } |
ysr@777 | 3761 | |
ysr@777 | 3762 | while (!has_aborted() && _cm->mark_stack_size() > target_size) { |
ysr@777 | 3763 | get_entries_from_global_stack(); |
ysr@777 | 3764 | drain_local_queue(partially); |
ysr@777 | 3765 | } |
ysr@777 | 3766 | |
tonyp@2973 | 3767 | if (_cm->verbose_low()) { |
johnc@4173 | 3768 | gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
johnc@4173 | 3769 | _worker_id, _cm->mark_stack_size()); |
tonyp@2973 | 3770 | } |
ysr@777 | 3771 | } |
ysr@777 | 3772 | } |
ysr@777 | 3773 | |
ysr@777 | 3774 | // SATB Queue has several assumptions on whether to call the par or |
ysr@777 | 3775 | // non-par versions of the methods. this is why some of the code is |
ysr@777 | 3776 | // replicated. We should really get rid of the single-threaded version |
ysr@777 | 3777 | // of the code to simplify things. |
ysr@777 | 3778 | void CMTask::drain_satb_buffers() { |
tonyp@2973 | 3779 | if (has_aborted()) return; |
ysr@777 | 3780 | |
ysr@777 | 3781 | // We set this so that the regular clock knows that we're in the |
ysr@777 | 3782 | // middle of draining buffers and doesn't set the abort flag when it |
ysr@777 | 3783 | // notices that SATB buffers are available for draining. It'd be |
ysr@777 | 3784 | // very counter productive if it did that. :-) |
ysr@777 | 3785 | _draining_satb_buffers = true; |
ysr@777 | 3786 | |
ysr@777 | 3787 | CMObjectClosure oc(this); |
ysr@777 | 3788 | SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
tonyp@2973 | 3789 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@4173 | 3790 | satb_mq_set.set_par_closure(_worker_id, &oc); |
tonyp@2973 | 3791 | } else { |
ysr@777 | 3792 | satb_mq_set.set_closure(&oc); |
tonyp@2973 | 3793 | } |
ysr@777 | 3794 | |
ysr@777 | 3795 | // This keeps claiming and applying the closure to completed buffers |
ysr@777 | 3796 | // until we run out of buffers or we need to abort. |
jmasa@2188 | 3797 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
ysr@777 | 3798 | while (!has_aborted() && |
johnc@4173 | 3799 | satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
tonyp@2973 | 3800 | if (_cm->verbose_medium()) { |
johnc@4173 | 3801 | gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
tonyp@2973 | 3802 | } |
ysr@777 | 3803 | statsOnly( ++_satb_buffers_processed ); |
ysr@777 | 3804 | regular_clock_call(); |
ysr@777 | 3805 | } |
ysr@777 | 3806 | } else { |
ysr@777 | 3807 | while (!has_aborted() && |
ysr@777 | 3808 | satb_mq_set.apply_closure_to_completed_buffer()) { |
tonyp@2973 | 3809 | if (_cm->verbose_medium()) { |
johnc@4173 | 3810 | gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
tonyp@2973 | 3811 | } |
ysr@777 | 3812 | statsOnly( ++_satb_buffers_processed ); |
ysr@777 | 3813 | regular_clock_call(); |
ysr@777 | 3814 | } |
ysr@777 | 3815 | } |
ysr@777 | 3816 | |
ysr@777 | 3817 | if (!concurrent() && !has_aborted()) { |
ysr@777 | 3818 | // We should only do this during remark. |
tonyp@2973 | 3819 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@4173 | 3820 | satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
tonyp@2973 | 3821 | } else { |
ysr@777 | 3822 | satb_mq_set.iterate_closure_all_threads(); |
tonyp@2973 | 3823 | } |
ysr@777 | 3824 | } |
ysr@777 | 3825 | |
ysr@777 | 3826 | _draining_satb_buffers = false; |
ysr@777 | 3827 | |
tonyp@1458 | 3828 | assert(has_aborted() || |
tonyp@1458 | 3829 | concurrent() || |
tonyp@1458 | 3830 | satb_mq_set.completed_buffers_num() == 0, "invariant"); |
ysr@777 | 3831 | |
tonyp@2973 | 3832 | if (G1CollectedHeap::use_parallel_gc_threads()) { |
johnc@4173 | 3833 | satb_mq_set.set_par_closure(_worker_id, NULL); |
tonyp@2973 | 3834 | } else { |
ysr@777 | 3835 | satb_mq_set.set_closure(NULL); |
tonyp@2973 | 3836 | } |
ysr@777 | 3837 | |
ysr@777 | 3838 | // again, this was a potentially expensive operation, decrease the |
ysr@777 | 3839 | // limits to get the regular clock call early |
ysr@777 | 3840 | decrease_limits(); |
ysr@777 | 3841 | } |
ysr@777 | 3842 | |
ysr@777 | 3843 | void CMTask::print_stats() { |
johnc@4173 | 3844 | gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
johnc@4173 | 3845 | _worker_id, _calls); |
ysr@777 | 3846 | gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
ysr@777 | 3847 | _elapsed_time_ms, _termination_time_ms); |
ysr@777 | 3848 | gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", |
ysr@777 | 3849 | _step_times_ms.num(), _step_times_ms.avg(), |
ysr@777 | 3850 | _step_times_ms.sd()); |
ysr@777 | 3851 | gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", |
ysr@777 | 3852 | _step_times_ms.maximum(), _step_times_ms.sum()); |
ysr@777 | 3853 | |
ysr@777 | 3854 | #if _MARKING_STATS_ |
ysr@777 | 3855 | gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", |
ysr@777 | 3856 | _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), |
ysr@777 | 3857 | _all_clock_intervals_ms.sd()); |
ysr@777 | 3858 | gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", |
ysr@777 | 3859 | _all_clock_intervals_ms.maximum(), |
ysr@777 | 3860 | _all_clock_intervals_ms.sum()); |
ysr@777 | 3861 | gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", |
ysr@777 | 3862 | _clock_due_to_scanning, _clock_due_to_marking); |
ysr@777 | 3863 | gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", |
ysr@777 | 3864 | _objs_scanned, _objs_found_on_bitmap); |
ysr@777 | 3865 | gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", |
ysr@777 | 3866 | _local_pushes, _local_pops, _local_max_size); |
ysr@777 | 3867 | gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", |
ysr@777 | 3868 | _global_pushes, _global_pops, _global_max_size); |
ysr@777 | 3869 | gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", |
ysr@777 | 3870 | _global_transfers_to,_global_transfers_from); |
tonyp@3691 | 3871 | gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
ysr@777 | 3872 | gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
ysr@777 | 3873 | gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", |
ysr@777 | 3874 | _steal_attempts, _steals); |
ysr@777 | 3875 | gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); |
ysr@777 | 3876 | gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", |
ysr@777 | 3877 | _aborted_overflow, _aborted_cm_aborted, _aborted_yield); |
ysr@777 | 3878 | gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", |
ysr@777 | 3879 | _aborted_timed_out, _aborted_satb, _aborted_termination); |
ysr@777 | 3880 | #endif // _MARKING_STATS_ |
ysr@777 | 3881 | } |
ysr@777 | 3882 | |
ysr@777 | 3883 | /***************************************************************************** |
ysr@777 | 3884 | |
ysr@777 | 3885 | The do_marking_step(time_target_ms) method is the building block |
ysr@777 | 3886 | of the parallel marking framework. It can be called in parallel |
ysr@777 | 3887 | with other invocations of do_marking_step() on different tasks |
ysr@777 | 3888 | (but only one per task, obviously) and concurrently with the |
ysr@777 | 3889 | mutator threads, or during remark, hence it eliminates the need |
ysr@777 | 3890 | for two versions of the code. When called during remark, it will |
ysr@777 | 3891 | pick up from where the task left off during the concurrent marking |
ysr@777 | 3892 | phase. Interestingly, tasks are also claimable during evacuation |
ysr@777 | 3893 | pauses too, since do_marking_step() ensures that it aborts before |
ysr@777 | 3894 | it needs to yield. |
ysr@777 | 3895 | |
ysr@777 | 3896 | The data structures that is uses to do marking work are the |
ysr@777 | 3897 | following: |
ysr@777 | 3898 | |
ysr@777 | 3899 | (1) Marking Bitmap. If there are gray objects that appear only |
ysr@777 | 3900 | on the bitmap (this happens either when dealing with an overflow |
ysr@777 | 3901 | or when the initial marking phase has simply marked the roots |
ysr@777 | 3902 | and didn't push them on the stack), then tasks claim heap |
ysr@777 | 3903 | regions whose bitmap they then scan to find gray objects. A |
ysr@777 | 3904 | global finger indicates where the end of the last claimed region |
ysr@777 | 3905 | is. A local finger indicates how far into the region a task has |
ysr@777 | 3906 | scanned. The two fingers are used to determine how to gray an |
ysr@777 | 3907 | object (i.e. whether simply marking it is OK, as it will be |
ysr@777 | 3908 | visited by a task in the future, or whether it needs to be also |
ysr@777 | 3909 | pushed on a stack). |
ysr@777 | 3910 | |
ysr@777 | 3911 | (2) Local Queue. The local queue of the task which is accessed |
ysr@777 | 3912 | reasonably efficiently by the task. Other tasks can steal from |
ysr@777 | 3913 | it when they run out of work. Throughout the marking phase, a |
ysr@777 | 3914 | task attempts to keep its local queue short but not totally |
ysr@777 | 3915 | empty, so that entries are available for stealing by other |
ysr@777 | 3916 | tasks. Only when there is no more work, a task will totally |
ysr@777 | 3917 | drain its local queue. |
ysr@777 | 3918 | |
ysr@777 | 3919 | (3) Global Mark Stack. This handles local queue overflow. During |
ysr@777 | 3920 | marking only sets of entries are moved between it and the local |
ysr@777 | 3921 | queues, as access to it requires a mutex and more fine-grain |
ysr@777 | 3922 | interaction with it which might cause contention. If it |
ysr@777 | 3923 | overflows, then the marking phase should restart and iterate |
ysr@777 | 3924 | over the bitmap to identify gray objects. Throughout the marking |
ysr@777 | 3925 | phase, tasks attempt to keep the global mark stack at a small |
ysr@777 | 3926 | length but not totally empty, so that entries are available for |
ysr@777 | 3927 | popping by other tasks. Only when there is no more work, tasks |
ysr@777 | 3928 | will totally drain the global mark stack. |
ysr@777 | 3929 | |
tonyp@3691 | 3930 | (4) SATB Buffer Queue. This is where completed SATB buffers are |
ysr@777 | 3931 | made available. Buffers are regularly removed from this queue |
ysr@777 | 3932 | and scanned for roots, so that the queue doesn't get too |
ysr@777 | 3933 | long. During remark, all completed buffers are processed, as |
ysr@777 | 3934 | well as the filled in parts of any uncompleted buffers. |
ysr@777 | 3935 | |
ysr@777 | 3936 | The do_marking_step() method tries to abort when the time target |
ysr@777 | 3937 | has been reached. There are a few other cases when the |
ysr@777 | 3938 | do_marking_step() method also aborts: |
ysr@777 | 3939 | |
ysr@777 | 3940 | (1) When the marking phase has been aborted (after a Full GC). |
ysr@777 | 3941 | |
tonyp@3691 | 3942 | (2) When a global overflow (on the global stack) has been |
tonyp@3691 | 3943 | triggered. Before the task aborts, it will actually sync up with |
tonyp@3691 | 3944 | the other tasks to ensure that all the marking data structures |
tonyp@3691 | 3945 | (local queues, stacks, fingers etc.) are re-initialised so that |
tonyp@3691 | 3946 | when do_marking_step() completes, the marking phase can |
tonyp@3691 | 3947 | immediately restart. |
ysr@777 | 3948 | |
ysr@777 | 3949 | (3) When enough completed SATB buffers are available. The |
ysr@777 | 3950 | do_marking_step() method only tries to drain SATB buffers right |
ysr@777 | 3951 | at the beginning. So, if enough buffers are available, the |
ysr@777 | 3952 | marking step aborts and the SATB buffers are processed at |
ysr@777 | 3953 | the beginning of the next invocation. |
ysr@777 | 3954 | |
ysr@777 | 3955 | (4) To yield. when we have to yield then we abort and yield |
ysr@777 | 3956 | right at the end of do_marking_step(). This saves us from a lot |
ysr@777 | 3957 | of hassle as, by yielding we might allow a Full GC. If this |
ysr@777 | 3958 | happens then objects will be compacted underneath our feet, the |
ysr@777 | 3959 | heap might shrink, etc. We save checking for this by just |
ysr@777 | 3960 | aborting and doing the yield right at the end. |
ysr@777 | 3961 | |
ysr@777 | 3962 | From the above it follows that the do_marking_step() method should |
ysr@777 | 3963 | be called in a loop (or, otherwise, regularly) until it completes. |
ysr@777 | 3964 | |
ysr@777 | 3965 | If a marking step completes without its has_aborted() flag being |
ysr@777 | 3966 | true, it means it has completed the current marking phase (and |
ysr@777 | 3967 | also all other marking tasks have done so and have all synced up). |
ysr@777 | 3968 | |
ysr@777 | 3969 | A method called regular_clock_call() is invoked "regularly" (in |
ysr@777 | 3970 | sub ms intervals) throughout marking. It is this clock method that |
ysr@777 | 3971 | checks all the abort conditions which were mentioned above and |
ysr@777 | 3972 | decides when the task should abort. A work-based scheme is used to |
ysr@777 | 3973 | trigger this clock method: when the number of object words the |
ysr@777 | 3974 | marking phase has scanned or the number of references the marking |
ysr@777 | 3975 | phase has visited reach a given limit. Additional invocations to |
ysr@777 | 3976 | the method clock have been planted in a few other strategic places |
ysr@777 | 3977 | too. The initial reason for the clock method was to avoid calling |
ysr@777 | 3978 | vtime too regularly, as it is quite expensive. So, once it was in |
ysr@777 | 3979 | place, it was natural to piggy-back all the other conditions on it |
ysr@777 | 3980 | too and not constantly check them throughout the code. |
ysr@777 | 3981 | |
ysr@777 | 3982 | *****************************************************************************/ |
ysr@777 | 3983 | |
johnc@2494 | 3984 | void CMTask::do_marking_step(double time_target_ms, |
johnc@2494 | 3985 | bool do_stealing, |
johnc@2494 | 3986 | bool do_termination) { |
tonyp@1458 | 3987 | assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
tonyp@1458 | 3988 | assert(concurrent() == _cm->concurrent(), "they should be the same"); |
tonyp@1458 | 3989 | |
ysr@777 | 3990 | G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
tonyp@1458 | 3991 | assert(_task_queues != NULL, "invariant"); |
tonyp@1458 | 3992 | assert(_task_queue != NULL, "invariant"); |
johnc@4173 | 3993 | assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
tonyp@1458 | 3994 | |
tonyp@1458 | 3995 | assert(!_claimed, |
tonyp@1458 | 3996 | "only one thread should claim this task at any one time"); |
ysr@777 | 3997 | |
ysr@777 | 3998 | // OK, this doesn't safeguard again all possible scenarios, as it is |
ysr@777 | 3999 | // possible for two threads to set the _claimed flag at the same |
ysr@777 | 4000 | // time. But it is only for debugging purposes anyway and it will |
ysr@777 | 4001 | // catch most problems. |
ysr@777 | 4002 | _claimed = true; |
ysr@777 | 4003 | |
ysr@777 | 4004 | _start_time_ms = os::elapsedVTime() * 1000.0; |
ysr@777 | 4005 | statsOnly( _interval_start_time_ms = _start_time_ms ); |
ysr@777 | 4006 | |
ysr@777 | 4007 | double diff_prediction_ms = |
ysr@777 | 4008 | g1_policy->get_new_prediction(&_marking_step_diffs_ms); |
ysr@777 | 4009 | _time_target_ms = time_target_ms - diff_prediction_ms; |
ysr@777 | 4010 | |
ysr@777 | 4011 | // set up the variables that are used in the work-based scheme to |
ysr@777 | 4012 | // call the regular clock method |
ysr@777 | 4013 | _words_scanned = 0; |
ysr@777 | 4014 | _refs_reached = 0; |
ysr@777 | 4015 | recalculate_limits(); |
ysr@777 | 4016 | |
ysr@777 | 4017 | // clear all flags |
ysr@777 | 4018 | clear_has_aborted(); |
johnc@2494 | 4019 | _has_timed_out = false; |
ysr@777 | 4020 | _draining_satb_buffers = false; |
ysr@777 | 4021 | |
ysr@777 | 4022 | ++_calls; |
ysr@777 | 4023 | |
tonyp@2973 | 4024 | if (_cm->verbose_low()) { |
johnc@4173 | 4025 | gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
ysr@777 | 4026 | "target = %1.2lfms >>>>>>>>>>", |
johnc@4173 | 4027 | _worker_id, _calls, _time_target_ms); |
tonyp@2973 | 4028 | } |
ysr@777 | 4029 | |
ysr@777 | 4030 | // Set up the bitmap and oop closures. Anything that uses them is |
ysr@777 | 4031 | // eventually called from this method, so it is OK to allocate these |
ysr@777 | 4032 | // statically. |
ysr@777 | 4033 | CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); |
tonyp@2968 | 4034 | G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
tonyp@2968 | 4035 | set_cm_oop_closure(&cm_oop_closure); |
ysr@777 | 4036 | |
ysr@777 | 4037 | if (_cm->has_overflown()) { |
tonyp@3691 | 4038 | // This can happen if the mark stack overflows during a GC pause |
tonyp@3691 | 4039 | // and this task, after a yield point, restarts. We have to abort |
tonyp@3691 | 4040 | // as we need to get into the overflow protocol which happens |
tonyp@3691 | 4041 | // right at the end of this task. |
ysr@777 | 4042 | set_has_aborted(); |
ysr@777 | 4043 | } |
ysr@777 | 4044 | |
ysr@777 | 4045 | // First drain any available SATB buffers. After this, we will not |
ysr@777 | 4046 | // look at SATB buffers before the next invocation of this method. |
ysr@777 | 4047 | // If enough completed SATB buffers are queued up, the regular clock |
ysr@777 | 4048 | // will abort this task so that it restarts. |
ysr@777 | 4049 | drain_satb_buffers(); |
ysr@777 | 4050 | // ...then partially drain the local queue and the global stack |
ysr@777 | 4051 | drain_local_queue(true); |
ysr@777 | 4052 | drain_global_stack(true); |
ysr@777 | 4053 | |
ysr@777 | 4054 | do { |
ysr@777 | 4055 | if (!has_aborted() && _curr_region != NULL) { |
ysr@777 | 4056 | // This means that we're already holding on to a region. |
tonyp@1458 | 4057 | assert(_finger != NULL, "if region is not NULL, then the finger " |
tonyp@1458 | 4058 | "should not be NULL either"); |
ysr@777 | 4059 | |
ysr@777 | 4060 | // We might have restarted this task after an evacuation pause |
ysr@777 | 4061 | // which might have evacuated the region we're holding on to |
ysr@777 | 4062 | // underneath our feet. Let's read its limit again to make sure |
ysr@777 | 4063 | // that we do not iterate over a region of the heap that |
ysr@777 | 4064 | // contains garbage (update_region_limit() will also move |
ysr@777 | 4065 | // _finger to the start of the region if it is found empty). |
ysr@777 | 4066 | update_region_limit(); |
ysr@777 | 4067 | // We will start from _finger not from the start of the region, |
ysr@777 | 4068 | // as we might be restarting this task after aborting half-way |
ysr@777 | 4069 | // through scanning this region. In this case, _finger points to |
ysr@777 | 4070 | // the address where we last found a marked object. If this is a |
ysr@777 | 4071 | // fresh region, _finger points to start(). |
ysr@777 | 4072 | MemRegion mr = MemRegion(_finger, _region_limit); |
ysr@777 | 4073 | |
tonyp@2973 | 4074 | if (_cm->verbose_low()) { |
johnc@4173 | 4075 | gclog_or_tty->print_cr("[%u] we're scanning part " |
ysr@777 | 4076 | "["PTR_FORMAT", "PTR_FORMAT") " |
ysr@777 | 4077 | "of region "PTR_FORMAT, |
johnc@4173 | 4078 | _worker_id, _finger, _region_limit, _curr_region); |
tonyp@2973 | 4079 | } |
ysr@777 | 4080 | |
ysr@777 | 4081 | // Let's iterate over the bitmap of the part of the |
ysr@777 | 4082 | // region that is left. |
tonyp@3691 | 4083 | if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
ysr@777 | 4084 | // We successfully completed iterating over the region. Now, |
ysr@777 | 4085 | // let's give up the region. |
ysr@777 | 4086 | giveup_current_region(); |
ysr@777 | 4087 | regular_clock_call(); |
ysr@777 | 4088 | } else { |
tonyp@1458 | 4089 | assert(has_aborted(), "currently the only way to do so"); |
ysr@777 | 4090 | // The only way to abort the bitmap iteration is to return |
ysr@777 | 4091 | // false from the do_bit() method. However, inside the |
ysr@777 | 4092 | // do_bit() method we move the _finger to point to the |
ysr@777 | 4093 | // object currently being looked at. So, if we bail out, we |
ysr@777 | 4094 | // have definitely set _finger to something non-null. |
tonyp@1458 | 4095 | assert(_finger != NULL, "invariant"); |
ysr@777 | 4096 | |
ysr@777 | 4097 | // Region iteration was actually aborted. So now _finger |
ysr@777 | 4098 | // points to the address of the object we last scanned. If we |
ysr@777 | 4099 | // leave it there, when we restart this task, we will rescan |
ysr@777 | 4100 | // the object. It is easy to avoid this. We move the finger by |
ysr@777 | 4101 | // enough to point to the next possible object header (the |
ysr@777 | 4102 | // bitmap knows by how much we need to move it as it knows its |
ysr@777 | 4103 | // granularity). |
apetrusenko@1749 | 4104 | assert(_finger < _region_limit, "invariant"); |
apetrusenko@1749 | 4105 | HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
apetrusenko@1749 | 4106 | // Check if bitmap iteration was aborted while scanning the last object |
apetrusenko@1749 | 4107 | if (new_finger >= _region_limit) { |
tonyp@3691 | 4108 | giveup_current_region(); |
apetrusenko@1749 | 4109 | } else { |
tonyp@3691 | 4110 | move_finger_to(new_finger); |
apetrusenko@1749 | 4111 | } |
ysr@777 | 4112 | } |
ysr@777 | 4113 | } |
ysr@777 | 4114 | // At this point we have either completed iterating over the |
ysr@777 | 4115 | // region we were holding on to, or we have aborted. |
ysr@777 | 4116 | |
ysr@777 | 4117 | // We then partially drain the local queue and the global stack. |
ysr@777 | 4118 | // (Do we really need this?) |
ysr@777 | 4119 | drain_local_queue(true); |
ysr@777 | 4120 | drain_global_stack(true); |
ysr@777 | 4121 | |
ysr@777 | 4122 | // Read the note on the claim_region() method on why it might |
ysr@777 | 4123 | // return NULL with potentially more regions available for |
ysr@777 | 4124 | // claiming and why we have to check out_of_regions() to determine |
ysr@777 | 4125 | // whether we're done or not. |
ysr@777 | 4126 | while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { |
ysr@777 | 4127 | // We are going to try to claim a new region. We should have |
ysr@777 | 4128 | // given up on the previous one. |
tonyp@1458 | 4129 | // Separated the asserts so that we know which one fires. |
tonyp@1458 | 4130 | assert(_curr_region == NULL, "invariant"); |
tonyp@1458 | 4131 | assert(_finger == NULL, "invariant"); |
tonyp@1458 | 4132 | assert(_region_limit == NULL, "invariant"); |
tonyp@2973 | 4133 | if (_cm->verbose_low()) { |
johnc@4173 | 4134 | gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
tonyp@2973 | 4135 | } |
johnc@4173 | 4136 | HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
ysr@777 | 4137 | if (claimed_region != NULL) { |
ysr@777 | 4138 | // Yes, we managed to claim one |
ysr@777 | 4139 | statsOnly( ++_regions_claimed ); |
ysr@777 | 4140 | |
tonyp@2973 | 4141 | if (_cm->verbose_low()) { |
johnc@4173 | 4142 | gclog_or_tty->print_cr("[%u] we successfully claimed " |
ysr@777 | 4143 | "region "PTR_FORMAT, |
johnc@4173 | 4144 | _worker_id, claimed_region); |
tonyp@2973 | 4145 | } |
ysr@777 | 4146 | |
ysr@777 | 4147 | setup_for_region(claimed_region); |
tonyp@1458 | 4148 | assert(_curr_region == claimed_region, "invariant"); |
ysr@777 | 4149 | } |
ysr@777 | 4150 | // It is important to call the regular clock here. It might take |
ysr@777 | 4151 | // a while to claim a region if, for example, we hit a large |
ysr@777 | 4152 | // block of empty regions. So we need to call the regular clock |
ysr@777 | 4153 | // method once round the loop to make sure it's called |
ysr@777 | 4154 | // frequently enough. |
ysr@777 | 4155 | regular_clock_call(); |
ysr@777 | 4156 | } |
ysr@777 | 4157 | |
ysr@777 | 4158 | if (!has_aborted() && _curr_region == NULL) { |
tonyp@1458 | 4159 | assert(_cm->out_of_regions(), |
tonyp@1458 | 4160 | "at this point we should be out of regions"); |
ysr@777 | 4161 | } |
ysr@777 | 4162 | } while ( _curr_region != NULL && !has_aborted()); |
ysr@777 | 4163 | |
ysr@777 | 4164 | if (!has_aborted()) { |
ysr@777 | 4165 | // We cannot check whether the global stack is empty, since other |
tonyp@3691 | 4166 | // tasks might be pushing objects to it concurrently. |
tonyp@1458 | 4167 | assert(_cm->out_of_regions(), |
tonyp@1458 | 4168 | "at this point we should be out of regions"); |
ysr@777 | 4169 | |
tonyp@2973 | 4170 | if (_cm->verbose_low()) { |
johnc@4173 | 4171 | gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
tonyp@2973 | 4172 | } |
ysr@777 | 4173 | |
ysr@777 | 4174 | // Try to reduce the number of available SATB buffers so that |
ysr@777 | 4175 | // remark has less work to do. |
ysr@777 | 4176 | drain_satb_buffers(); |
ysr@777 | 4177 | } |
ysr@777 | 4178 | |
ysr@777 | 4179 | // Since we've done everything else, we can now totally drain the |
ysr@777 | 4180 | // local queue and global stack. |
ysr@777 | 4181 | drain_local_queue(false); |
ysr@777 | 4182 | drain_global_stack(false); |
ysr@777 | 4183 | |
ysr@777 | 4184 | // Attempt at work stealing from other task's queues. |
johnc@2494 | 4185 | if (do_stealing && !has_aborted()) { |
ysr@777 | 4186 | // We have not aborted. This means that we have finished all that |
ysr@777 | 4187 | // we could. Let's try to do some stealing... |
ysr@777 | 4188 | |
ysr@777 | 4189 | // We cannot check whether the global stack is empty, since other |
tonyp@3691 | 4190 | // tasks might be pushing objects to it concurrently. |
tonyp@1458 | 4191 | assert(_cm->out_of_regions() && _task_queue->size() == 0, |
tonyp@1458 | 4192 | "only way to reach here"); |
ysr@777 | 4193 | |
tonyp@2973 | 4194 | if (_cm->verbose_low()) { |
johnc@4173 | 4195 | gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
tonyp@2973 | 4196 | } |
ysr@777 | 4197 | |
ysr@777 | 4198 | while (!has_aborted()) { |
ysr@777 | 4199 | oop obj; |
ysr@777 | 4200 | statsOnly( ++_steal_attempts ); |
ysr@777 | 4201 | |
johnc@4173 | 4202 | if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
tonyp@2973 | 4203 | if (_cm->verbose_medium()) { |
johnc@4173 | 4204 | gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
johnc@4173 | 4205 | _worker_id, (void*) obj); |
tonyp@2973 | 4206 | } |
ysr@777 | 4207 | |
ysr@777 | 4208 | statsOnly( ++_steals ); |
ysr@777 | 4209 | |
tonyp@1458 | 4210 | assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
tonyp@1458 | 4211 | "any stolen object should be marked"); |
ysr@777 | 4212 | scan_object(obj); |
ysr@777 | 4213 | |
ysr@777 | 4214 | // And since we're towards the end, let's totally drain the |
ysr@777 | 4215 | // local queue and global stack. |
ysr@777 | 4216 | drain_local_queue(false); |
ysr@777 | 4217 | drain_global_stack(false); |
ysr@777 | 4218 | } else { |
ysr@777 | 4219 | break; |
ysr@777 | 4220 | } |
ysr@777 | 4221 | } |
ysr@777 | 4222 | } |
ysr@777 | 4223 | |
tonyp@2848 | 4224 | // If we are about to wrap up and go into termination, check if we |
tonyp@2848 | 4225 | // should raise the overflow flag. |
tonyp@2848 | 4226 | if (do_termination && !has_aborted()) { |
tonyp@2848 | 4227 | if (_cm->force_overflow()->should_force()) { |
tonyp@2848 | 4228 | _cm->set_has_overflown(); |
tonyp@2848 | 4229 | regular_clock_call(); |
tonyp@2848 | 4230 | } |
tonyp@2848 | 4231 | } |
tonyp@2848 | 4232 | |
ysr@777 | 4233 | // We still haven't aborted. Now, let's try to get into the |
ysr@777 | 4234 | // termination protocol. |
johnc@2494 | 4235 | if (do_termination && !has_aborted()) { |
ysr@777 | 4236 | // We cannot check whether the global stack is empty, since other |
tonyp@3691 | 4237 | // tasks might be concurrently pushing objects on it. |
tonyp@1458 | 4238 | // Separated the asserts so that we know which one fires. |
tonyp@1458 | 4239 | assert(_cm->out_of_regions(), "only way to reach here"); |
tonyp@1458 | 4240 | assert(_task_queue->size() == 0, "only way to reach here"); |
ysr@777 | 4241 | |
tonyp@2973 | 4242 | if (_cm->verbose_low()) { |
johnc@4173 | 4243 | gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
tonyp@2973 | 4244 | } |
ysr@777 | 4245 | |
ysr@777 | 4246 | _termination_start_time_ms = os::elapsedVTime() * 1000.0; |
ysr@777 | 4247 | // The CMTask class also extends the TerminatorTerminator class, |
ysr@777 | 4248 | // hence its should_exit_termination() method will also decide |
ysr@777 | 4249 | // whether to exit the termination protocol or not. |
ysr@777 | 4250 | bool finished = _cm->terminator()->offer_termination(this); |
ysr@777 | 4251 | double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
ysr@777 | 4252 | _termination_time_ms += |
ysr@777 | 4253 | termination_end_time_ms - _termination_start_time_ms; |
ysr@777 | 4254 | |
ysr@777 | 4255 | if (finished) { |
ysr@777 | 4256 | // We're all done. |
ysr@777 | 4257 | |
johnc@4173 | 4258 | if (_worker_id == 0) { |
ysr@777 | 4259 | // let's allow task 0 to do this |
ysr@777 | 4260 | if (concurrent()) { |
tonyp@1458 | 4261 | assert(_cm->concurrent_marking_in_progress(), "invariant"); |
ysr@777 | 4262 | // we need to set this to false before the next |
ysr@777 | 4263 | // safepoint. This way we ensure that the marking phase |
ysr@777 | 4264 | // doesn't observe any more heap expansions. |
ysr@777 | 4265 | _cm->clear_concurrent_marking_in_progress(); |
ysr@777 | 4266 | } |
ysr@777 | 4267 | } |
ysr@777 | 4268 | |
ysr@777 | 4269 | // We can now guarantee that the global stack is empty, since |
tonyp@1458 | 4270 | // all other tasks have finished. We separated the guarantees so |
tonyp@1458 | 4271 | // that, if a condition is false, we can immediately find out |
tonyp@1458 | 4272 | // which one. |
tonyp@1458 | 4273 | guarantee(_cm->out_of_regions(), "only way to reach here"); |
tonyp@1458 | 4274 | guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
tonyp@1458 | 4275 | guarantee(_task_queue->size() == 0, "only way to reach here"); |
tonyp@1458 | 4276 | guarantee(!_cm->has_overflown(), "only way to reach here"); |
tonyp@1458 | 4277 | guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
ysr@777 | 4278 | |
tonyp@2973 | 4279 | if (_cm->verbose_low()) { |
johnc@4173 | 4280 | gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
tonyp@2973 | 4281 | } |
ysr@777 | 4282 | } else { |
ysr@777 | 4283 | // Apparently there's more work to do. Let's abort this task. It |
ysr@777 | 4284 | // will restart it and we can hopefully find more things to do. |
ysr@777 | 4285 | |
tonyp@2973 | 4286 | if (_cm->verbose_low()) { |
johnc@4173 | 4287 | gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
johnc@4173 | 4288 | _worker_id); |
tonyp@2973 | 4289 | } |
ysr@777 | 4290 | |
ysr@777 | 4291 | set_has_aborted(); |
ysr@777 | 4292 | statsOnly( ++_aborted_termination ); |
ysr@777 | 4293 | } |
ysr@777 | 4294 | } |
ysr@777 | 4295 | |
ysr@777 | 4296 | // Mainly for debugging purposes to make sure that a pointer to the |
ysr@777 | 4297 | // closure which was statically allocated in this frame doesn't |
ysr@777 | 4298 | // escape it by accident. |
tonyp@2968 | 4299 | set_cm_oop_closure(NULL); |
ysr@777 | 4300 | double end_time_ms = os::elapsedVTime() * 1000.0; |
ysr@777 | 4301 | double elapsed_time_ms = end_time_ms - _start_time_ms; |
ysr@777 | 4302 | // Update the step history. |
ysr@777 | 4303 | _step_times_ms.add(elapsed_time_ms); |
ysr@777 | 4304 | |
ysr@777 | 4305 | if (has_aborted()) { |
ysr@777 | 4306 | // The task was aborted for some reason. |
ysr@777 | 4307 | |
ysr@777 | 4308 | statsOnly( ++_aborted ); |
ysr@777 | 4309 | |
johnc@2494 | 4310 | if (_has_timed_out) { |
ysr@777 | 4311 | double diff_ms = elapsed_time_ms - _time_target_ms; |
ysr@777 | 4312 | // Keep statistics of how well we did with respect to hitting |
ysr@777 | 4313 | // our target only if we actually timed out (if we aborted for |
ysr@777 | 4314 | // other reasons, then the results might get skewed). |
ysr@777 | 4315 | _marking_step_diffs_ms.add(diff_ms); |
ysr@777 | 4316 | } |
ysr@777 | 4317 | |
ysr@777 | 4318 | if (_cm->has_overflown()) { |
ysr@777 | 4319 | // This is the interesting one. We aborted because a global |
ysr@777 | 4320 | // overflow was raised. This means we have to restart the |
ysr@777 | 4321 | // marking phase and start iterating over regions. However, in |
ysr@777 | 4322 | // order to do this we have to make sure that all tasks stop |
ysr@777 | 4323 | // what they are doing and re-initialise in a safe manner. We |
ysr@777 | 4324 | // will achieve this with the use of two barrier sync points. |
ysr@777 | 4325 | |
tonyp@2973 | 4326 | if (_cm->verbose_low()) { |
johnc@4173 | 4327 | gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
tonyp@2973 | 4328 | } |
ysr@777 | 4329 | |
johnc@4173 | 4330 | _cm->enter_first_sync_barrier(_worker_id); |
ysr@777 | 4331 | // When we exit this sync barrier we know that all tasks have |
ysr@777 | 4332 | // stopped doing marking work. So, it's now safe to |
ysr@777 | 4333 | // re-initialise our data structures. At the end of this method, |
ysr@777 | 4334 | // task 0 will clear the global data structures. |
ysr@777 | 4335 | |
ysr@777 | 4336 | statsOnly( ++_aborted_overflow ); |
ysr@777 | 4337 | |
ysr@777 | 4338 | // We clear the local state of this task... |
ysr@777 | 4339 | clear_region_fields(); |
ysr@777 | 4340 | |
ysr@777 | 4341 | // ...and enter the second barrier. |
johnc@4173 | 4342 | _cm->enter_second_sync_barrier(_worker_id); |
ysr@777 | 4343 | // At this point everything has bee re-initialised and we're |
ysr@777 | 4344 | // ready to restart. |
ysr@777 | 4345 | } |
ysr@777 | 4346 | |
ysr@777 | 4347 | if (_cm->verbose_low()) { |
johnc@4173 | 4348 | gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
ysr@777 | 4349 | "elapsed = %1.2lfms <<<<<<<<<<", |
johnc@4173 | 4350 | _worker_id, _time_target_ms, elapsed_time_ms); |
tonyp@2973 | 4351 | if (_cm->has_aborted()) { |
johnc@4173 | 4352 | gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
johnc@4173 | 4353 | _worker_id); |
tonyp@2973 | 4354 | } |
ysr@777 | 4355 | } |
ysr@777 | 4356 | } else { |
tonyp@2973 | 4357 | if (_cm->verbose_low()) { |
johnc@4173 | 4358 | gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
ysr@777 | 4359 | "elapsed = %1.2lfms <<<<<<<<<<", |
johnc@4173 | 4360 | _worker_id, _time_target_ms, elapsed_time_ms); |
tonyp@2973 | 4361 | } |
ysr@777 | 4362 | } |
ysr@777 | 4363 | |
ysr@777 | 4364 | _claimed = false; |
ysr@777 | 4365 | } |
ysr@777 | 4366 | |
johnc@4173 | 4367 | CMTask::CMTask(uint worker_id, |
ysr@777 | 4368 | ConcurrentMark* cm, |
johnc@3463 | 4369 | size_t* marked_bytes, |
johnc@3463 | 4370 | BitMap* card_bm, |
ysr@777 | 4371 | CMTaskQueue* task_queue, |
ysr@777 | 4372 | CMTaskQueueSet* task_queues) |
ysr@777 | 4373 | : _g1h(G1CollectedHeap::heap()), |
johnc@4173 | 4374 | _worker_id(worker_id), _cm(cm), |
ysr@777 | 4375 | _claimed(false), |
ysr@777 | 4376 | _nextMarkBitMap(NULL), _hash_seed(17), |
ysr@777 | 4377 | _task_queue(task_queue), |
ysr@777 | 4378 | _task_queues(task_queues), |
tonyp@2968 | 4379 | _cm_oop_closure(NULL), |
johnc@3463 | 4380 | _marked_bytes_array(marked_bytes), |
johnc@3463 | 4381 | _card_bm(card_bm) { |
tonyp@1458 | 4382 | guarantee(task_queue != NULL, "invariant"); |
tonyp@1458 | 4383 | guarantee(task_queues != NULL, "invariant"); |
ysr@777 | 4384 | |
ysr@777 | 4385 | statsOnly( _clock_due_to_scanning = 0; |
ysr@777 | 4386 | _clock_due_to_marking = 0 ); |
ysr@777 | 4387 | |
ysr@777 | 4388 | _marking_step_diffs_ms.add(0.5); |
ysr@777 | 4389 | } |
tonyp@2717 | 4390 | |
tonyp@2717 | 4391 | // These are formatting macros that are used below to ensure |
tonyp@2717 | 4392 | // consistent formatting. The *_H_* versions are used to format the |
tonyp@2717 | 4393 | // header for a particular value and they should be kept consistent |
tonyp@2717 | 4394 | // with the corresponding macro. Also note that most of the macros add |
tonyp@2717 | 4395 | // the necessary white space (as a prefix) which makes them a bit |
tonyp@2717 | 4396 | // easier to compose. |
tonyp@2717 | 4397 | |
tonyp@2717 | 4398 | // All the output lines are prefixed with this string to be able to |
tonyp@2717 | 4399 | // identify them easily in a large log file. |
tonyp@2717 | 4400 | #define G1PPRL_LINE_PREFIX "###" |
tonyp@2717 | 4401 | |
tonyp@2717 | 4402 | #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
tonyp@2717 | 4403 | #ifdef _LP64 |
tonyp@2717 | 4404 | #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
tonyp@2717 | 4405 | #else // _LP64 |
tonyp@2717 | 4406 | #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
tonyp@2717 | 4407 | #endif // _LP64 |
tonyp@2717 | 4408 | |
tonyp@2717 | 4409 | // For per-region info |
tonyp@2717 | 4410 | #define G1PPRL_TYPE_FORMAT " %-4s" |
tonyp@2717 | 4411 | #define G1PPRL_TYPE_H_FORMAT " %4s" |
tonyp@2717 | 4412 | #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
tonyp@2717 | 4413 | #define G1PPRL_BYTE_H_FORMAT " %9s" |
tonyp@2717 | 4414 | #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
tonyp@2717 | 4415 | #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
tonyp@2717 | 4416 | |
tonyp@2717 | 4417 | // For summary info |
tonyp@2717 | 4418 | #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
tonyp@2717 | 4419 | #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
tonyp@2717 | 4420 | #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
tonyp@2717 | 4421 | #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
tonyp@2717 | 4422 | |
tonyp@2717 | 4423 | G1PrintRegionLivenessInfoClosure:: |
tonyp@2717 | 4424 | G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
tonyp@2717 | 4425 | : _out(out), |
tonyp@2717 | 4426 | _total_used_bytes(0), _total_capacity_bytes(0), |
tonyp@2717 | 4427 | _total_prev_live_bytes(0), _total_next_live_bytes(0), |
tonyp@2717 | 4428 | _hum_used_bytes(0), _hum_capacity_bytes(0), |
tonyp@2717 | 4429 | _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
tonyp@2717 | 4430 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
tonyp@2717 | 4431 | MemRegion g1_committed = g1h->g1_committed(); |
tonyp@2717 | 4432 | MemRegion g1_reserved = g1h->g1_reserved(); |
tonyp@2717 | 4433 | double now = os::elapsedTime(); |
tonyp@2717 | 4434 | |
tonyp@2717 | 4435 | // Print the header of the output. |
tonyp@2717 | 4436 | _out->cr(); |
tonyp@2717 | 4437 | _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
tonyp@2717 | 4438 | _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
tonyp@2717 | 4439 | G1PPRL_SUM_ADDR_FORMAT("committed") |
tonyp@2717 | 4440 | G1PPRL_SUM_ADDR_FORMAT("reserved") |
tonyp@2717 | 4441 | G1PPRL_SUM_BYTE_FORMAT("region-size"), |
tonyp@2717 | 4442 | g1_committed.start(), g1_committed.end(), |
tonyp@2717 | 4443 | g1_reserved.start(), g1_reserved.end(), |
johnc@3182 | 4444 | HeapRegion::GrainBytes); |
tonyp@2717 | 4445 | _out->print_cr(G1PPRL_LINE_PREFIX); |
tonyp@2717 | 4446 | _out->print_cr(G1PPRL_LINE_PREFIX |
tonyp@2717 | 4447 | G1PPRL_TYPE_H_FORMAT |
tonyp@2717 | 4448 | G1PPRL_ADDR_BASE_H_FORMAT |
tonyp@2717 | 4449 | G1PPRL_BYTE_H_FORMAT |
tonyp@2717 | 4450 | G1PPRL_BYTE_H_FORMAT |
tonyp@2717 | 4451 | G1PPRL_BYTE_H_FORMAT |
tonyp@2717 | 4452 | G1PPRL_DOUBLE_H_FORMAT, |
tonyp@2717 | 4453 | "type", "address-range", |
tonyp@2717 | 4454 | "used", "prev-live", "next-live", "gc-eff"); |
johnc@3173 | 4455 | _out->print_cr(G1PPRL_LINE_PREFIX |
johnc@3173 | 4456 | G1PPRL_TYPE_H_FORMAT |
johnc@3173 | 4457 | G1PPRL_ADDR_BASE_H_FORMAT |
johnc@3173 | 4458 | G1PPRL_BYTE_H_FORMAT |
johnc@3173 | 4459 | G1PPRL_BYTE_H_FORMAT |
johnc@3173 | 4460 | G1PPRL_BYTE_H_FORMAT |
johnc@3173 | 4461 | G1PPRL_DOUBLE_H_FORMAT, |
johnc@3173 | 4462 | "", "", |
johnc@3173 | 4463 | "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
tonyp@2717 | 4464 | } |
tonyp@2717 | 4465 | |
tonyp@2717 | 4466 | // It takes as a parameter a reference to one of the _hum_* fields, it |
tonyp@2717 | 4467 | // deduces the corresponding value for a region in a humongous region |
tonyp@2717 | 4468 | // series (either the region size, or what's left if the _hum_* field |
tonyp@2717 | 4469 | // is < the region size), and updates the _hum_* field accordingly. |
tonyp@2717 | 4470 | size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
tonyp@2717 | 4471 | size_t bytes = 0; |
tonyp@2717 | 4472 | // The > 0 check is to deal with the prev and next live bytes which |
tonyp@2717 | 4473 | // could be 0. |
tonyp@2717 | 4474 | if (*hum_bytes > 0) { |
johnc@3182 | 4475 | bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
tonyp@2717 | 4476 | *hum_bytes -= bytes; |
tonyp@2717 | 4477 | } |
tonyp@2717 | 4478 | return bytes; |
tonyp@2717 | 4479 | } |
tonyp@2717 | 4480 | |
tonyp@2717 | 4481 | // It deduces the values for a region in a humongous region series |
tonyp@2717 | 4482 | // from the _hum_* fields and updates those accordingly. It assumes |
tonyp@2717 | 4483 | // that that _hum_* fields have already been set up from the "starts |
tonyp@2717 | 4484 | // humongous" region and we visit the regions in address order. |
tonyp@2717 | 4485 | void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
tonyp@2717 | 4486 | size_t* capacity_bytes, |
tonyp@2717 | 4487 | size_t* prev_live_bytes, |
tonyp@2717 | 4488 | size_t* next_live_bytes) { |
tonyp@2717 | 4489 | assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
tonyp@2717 | 4490 | *used_bytes = get_hum_bytes(&_hum_used_bytes); |
tonyp@2717 | 4491 | *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
tonyp@2717 | 4492 | *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
tonyp@2717 | 4493 | *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
tonyp@2717 | 4494 | } |
tonyp@2717 | 4495 | |
tonyp@2717 | 4496 | bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
tonyp@2717 | 4497 | const char* type = ""; |
tonyp@2717 | 4498 | HeapWord* bottom = r->bottom(); |
tonyp@2717 | 4499 | HeapWord* end = r->end(); |
tonyp@2717 | 4500 | size_t capacity_bytes = r->capacity(); |
tonyp@2717 | 4501 | size_t used_bytes = r->used(); |
tonyp@2717 | 4502 | size_t prev_live_bytes = r->live_bytes(); |
tonyp@2717 | 4503 | size_t next_live_bytes = r->next_live_bytes(); |
tonyp@2717 | 4504 | double gc_eff = r->gc_efficiency(); |
tonyp@2717 | 4505 | if (r->used() == 0) { |
tonyp@2717 | 4506 | type = "FREE"; |
tonyp@2717 | 4507 | } else if (r->is_survivor()) { |
tonyp@2717 | 4508 | type = "SURV"; |
tonyp@2717 | 4509 | } else if (r->is_young()) { |
tonyp@2717 | 4510 | type = "EDEN"; |
tonyp@2717 | 4511 | } else if (r->startsHumongous()) { |
tonyp@2717 | 4512 | type = "HUMS"; |
tonyp@2717 | 4513 | |
tonyp@2717 | 4514 | assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
tonyp@2717 | 4515 | _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
tonyp@2717 | 4516 | "they should have been zeroed after the last time we used them"); |
tonyp@2717 | 4517 | // Set up the _hum_* fields. |
tonyp@2717 | 4518 | _hum_capacity_bytes = capacity_bytes; |
tonyp@2717 | 4519 | _hum_used_bytes = used_bytes; |
tonyp@2717 | 4520 | _hum_prev_live_bytes = prev_live_bytes; |
tonyp@2717 | 4521 | _hum_next_live_bytes = next_live_bytes; |
tonyp@2717 | 4522 | get_hum_bytes(&used_bytes, &capacity_bytes, |
tonyp@2717 | 4523 | &prev_live_bytes, &next_live_bytes); |
tonyp@2717 | 4524 | end = bottom + HeapRegion::GrainWords; |
tonyp@2717 | 4525 | } else if (r->continuesHumongous()) { |
tonyp@2717 | 4526 | type = "HUMC"; |
tonyp@2717 | 4527 | get_hum_bytes(&used_bytes, &capacity_bytes, |
tonyp@2717 | 4528 | &prev_live_bytes, &next_live_bytes); |
tonyp@2717 | 4529 | assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
tonyp@2717 | 4530 | } else { |
tonyp@2717 | 4531 | type = "OLD"; |
tonyp@2717 | 4532 | } |
tonyp@2717 | 4533 | |
tonyp@2717 | 4534 | _total_used_bytes += used_bytes; |
tonyp@2717 | 4535 | _total_capacity_bytes += capacity_bytes; |
tonyp@2717 | 4536 | _total_prev_live_bytes += prev_live_bytes; |
tonyp@2717 | 4537 | _total_next_live_bytes += next_live_bytes; |
tonyp@2717 | 4538 | |
tonyp@2717 | 4539 | // Print a line for this particular region. |
tonyp@2717 | 4540 | _out->print_cr(G1PPRL_LINE_PREFIX |
tonyp@2717 | 4541 | G1PPRL_TYPE_FORMAT |
tonyp@2717 | 4542 | G1PPRL_ADDR_BASE_FORMAT |
tonyp@2717 | 4543 | G1PPRL_BYTE_FORMAT |
tonyp@2717 | 4544 | G1PPRL_BYTE_FORMAT |
tonyp@2717 | 4545 | G1PPRL_BYTE_FORMAT |
tonyp@2717 | 4546 | G1PPRL_DOUBLE_FORMAT, |
tonyp@2717 | 4547 | type, bottom, end, |
tonyp@2717 | 4548 | used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
tonyp@2717 | 4549 | |
tonyp@2717 | 4550 | return false; |
tonyp@2717 | 4551 | } |
tonyp@2717 | 4552 | |
tonyp@2717 | 4553 | G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
tonyp@2717 | 4554 | // Print the footer of the output. |
tonyp@2717 | 4555 | _out->print_cr(G1PPRL_LINE_PREFIX); |
tonyp@2717 | 4556 | _out->print_cr(G1PPRL_LINE_PREFIX |
tonyp@2717 | 4557 | " SUMMARY" |
tonyp@2717 | 4558 | G1PPRL_SUM_MB_FORMAT("capacity") |
tonyp@2717 | 4559 | G1PPRL_SUM_MB_PERC_FORMAT("used") |
tonyp@2717 | 4560 | G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
tonyp@2717 | 4561 | G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
tonyp@2717 | 4562 | bytes_to_mb(_total_capacity_bytes), |
tonyp@2717 | 4563 | bytes_to_mb(_total_used_bytes), |
tonyp@2717 | 4564 | perc(_total_used_bytes, _total_capacity_bytes), |
tonyp@2717 | 4565 | bytes_to_mb(_total_prev_live_bytes), |
tonyp@2717 | 4566 | perc(_total_prev_live_bytes, _total_capacity_bytes), |
tonyp@2717 | 4567 | bytes_to_mb(_total_next_live_bytes), |
tonyp@2717 | 4568 | perc(_total_next_live_bytes, _total_capacity_bytes)); |
tonyp@2717 | 4569 | _out->cr(); |
tonyp@2717 | 4570 | } |