Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 17746:a258f8cb530f
8029255: G1: Reference processing should not enqueue references on the shared SATB queue
Reviewed-by: brutisso, tschatzl
| author | pliden |
|---|---|
| date | Fri, 10 Jan 2014 09:53:53 +0100 |
| parents | cfd4aac53239 |
| children | d8041d695d19 78bbf4d43a14 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "memory/genCollectedHeap.hpp" | |
| 27 #include "memory/resourceArea.hpp" | |
| 28 #include "memory/threadLocalAllocBuffer.inline.hpp" | |
| 29 #include "memory/universe.inline.hpp" | |
| 30 #include "oops/oop.inline.hpp" | |
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31 #include "runtime/thread.inline.hpp" |
| 1972 | 32 #include "utilities/copy.hpp" |
| 0 | 33 |
| 1972 | 34 // Thread-Local Edens support |
| 0 | 35 |
| 36 // static member initialization | |
| 17727 | 37 size_t ThreadLocalAllocBuffer::_max_size = 0; |
| 0 | 38 unsigned ThreadLocalAllocBuffer::_target_refills = 0; |
| 39 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL; | |
| 40 | |
| 41 void ThreadLocalAllocBuffer::clear_before_allocation() { | |
| 42 _slow_refill_waste += (unsigned)remaining(); | |
| 43 make_parsable(true); // also retire the TLAB | |
| 44 } | |
| 45 | |
| 46 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
| 47 global_stats()->initialize(); | |
| 48 | |
| 17727 | 49 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { |
| 0 | 50 thread->tlab().accumulate_statistics(); |
| 51 thread->tlab().initialize_statistics(); | |
| 52 } | |
| 53 | |
| 54 // Publish new stats if some allocation occurred. | |
| 55 if (global_stats()->allocation() != 0) { | |
| 56 global_stats()->publish(); | |
| 57 if (PrintTLAB) { | |
| 58 global_stats()->print(); | |
| 59 } | |
| 60 } | |
| 61 } | |
| 62 | |
| 63 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
| 17727 | 64 Thread* thread = myThread(); |
| 65 size_t capacity = Universe::heap()->tlab_capacity(thread); | |
| 66 size_t used = Universe::heap()->tlab_used(thread); | |
| 0 | 67 |
| 68 _gc_waste += (unsigned)remaining(); | |
| 17727 | 69 size_t total_allocated = thread->allocated_bytes(); |
| 70 size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc; | |
| 71 _allocated_before_last_gc = total_allocated; | |
| 0 | 72 |
| 73 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
| 74 print_stats("gc"); | |
| 75 } | |
| 76 | |
| 77 if (_number_of_refills > 0) { | |
| 17727 | 78 // Update allocation history if a reasonable amount of eden was allocated. |
| 79 bool update_allocation_history = used > 0.5 * capacity; | |
| 0 | 80 |
| 81 if (update_allocation_history) { | |
| 82 // Average the fraction of eden allocated in a tlab by this | |
| 83 // thread for use in the next resize operation. | |
| 84 // _gc_waste is not subtracted because it's included in | |
| 85 // "used". | |
| 17727 | 86 // The result can be larger than 1.0 due to direct to old allocations. |
| 87 // These allocations should ideally not be counted but since it is not possible | |
| 88 // to filter them out here we just cap the fraction to be at most 1.0. | |
| 89 double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used); | |
| 0 | 90 _allocation_fraction.sample(alloc_frac); |
| 91 } | |
| 92 global_stats()->update_allocating_threads(); | |
| 93 global_stats()->update_number_of_refills(_number_of_refills); | |
| 94 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
| 95 global_stats()->update_gc_waste(_gc_waste); | |
| 96 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
| 97 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
| 98 | |
| 99 } else { | |
| 100 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && | |
| 101 _slow_refill_waste == 0 && _gc_waste == 0, | |
| 102 "tlab stats == 0"); | |
| 103 } | |
| 104 global_stats()->update_slow_allocations(_slow_allocations); | |
| 105 } | |
| 106 | |
| 107 // Fills the current tlab with a dummy filler array to create | |
| 108 // an illusion of a contiguous Eden and optionally retires the tlab. | |
| 109 // Waste accounting should be done in caller as appropriate; see, | |
| 110 // for example, clear_before_allocation(). | |
| 111 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
| 112 if (end() != NULL) { | |
| 113 invariants(); | |
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114 |
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115 if (retire) { |
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116 myThread()->incr_allocated_bytes(used_bytes()); |
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117 } |
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118 |
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119 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
| 0 | 120 |
| 121 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
| 122 set_start(NULL); | |
| 123 set_top(NULL); | |
| 124 set_pf_top(NULL); | |
| 125 set_end(NULL); | |
| 126 } | |
| 127 } | |
| 128 assert(!(retire || ZeroTLAB) || | |
| 129 (start() == NULL && end() == NULL && top() == NULL), | |
| 130 "TLAB must be reset"); | |
| 131 } | |
| 132 | |
| 133 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
| 17727 | 134 if (ResizeTLAB) { |
| 135 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 136 thread->tlab().resize(); | |
| 137 } | |
| 0 | 138 } |
| 139 } | |
| 140 | |
| 141 void ThreadLocalAllocBuffer::resize() { | |
| 17727 | 142 // Compute the next tlab size using expected allocation amount |
| 143 assert(ResizeTLAB, "Should not call this otherwise"); | |
| 144 size_t alloc = (size_t)(_allocation_fraction.average() * | |
| 145 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
| 146 size_t new_size = alloc / _target_refills; | |
| 0 | 147 |
| 17727 | 148 new_size = MIN2(MAX2(new_size, min_size()), max_size()); |
| 0 | 149 |
| 17727 | 150 size_t aligned_new_size = align_object_size(new_size); |
| 0 | 151 |
| 17727 | 152 if (PrintTLAB && Verbose) { |
| 153 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
| 154 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
| 155 myThread(), myThread()->osthread()->thread_id(), | |
| 156 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
| 0 | 157 } |
| 17727 | 158 set_desired_size(aligned_new_size); |
| 159 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 0 | 160 } |
| 161 | |
| 162 void ThreadLocalAllocBuffer::initialize_statistics() { | |
| 163 _number_of_refills = 0; | |
| 164 _fast_refill_waste = 0; | |
| 165 _slow_refill_waste = 0; | |
| 166 _gc_waste = 0; | |
| 167 _slow_allocations = 0; | |
| 168 } | |
| 169 | |
| 170 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
| 171 HeapWord* top, | |
| 172 size_t new_size) { | |
| 173 _number_of_refills++; | |
| 174 if (PrintTLAB && Verbose) { | |
| 175 print_stats("fill"); | |
| 176 } | |
| 177 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
| 178 initialize(start, top, start + new_size - alignment_reserve()); | |
| 179 | |
| 180 // Reset amount of internal fragmentation | |
| 181 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 182 } | |
| 183 | |
| 184 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
| 185 HeapWord* top, | |
| 186 HeapWord* end) { | |
| 187 set_start(start); | |
| 188 set_top(top); | |
| 189 set_pf_top(top); | |
| 190 set_end(end); | |
| 191 invariants(); | |
| 192 } | |
| 193 | |
| 194 void ThreadLocalAllocBuffer::initialize() { | |
| 195 initialize(NULL, // start | |
| 196 NULL, // top | |
| 197 NULL); // end | |
| 198 | |
| 199 set_desired_size(initial_desired_size()); | |
| 200 | |
| 201 // Following check is needed because at startup the main (primordial) | |
| 202 // thread is initialized before the heap is. The initialization for | |
| 203 // this thread is redone in startup_initialization below. | |
| 204 if (Universe::heap() != NULL) { | |
| 205 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
| 206 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
| 207 _allocation_fraction.sample(alloc_frac); | |
| 208 } | |
| 209 | |
| 210 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 211 | |
| 212 initialize_statistics(); | |
| 213 } | |
| 214 | |
| 215 void ThreadLocalAllocBuffer::startup_initialization() { | |
| 216 | |
| 217 // Assuming each thread's active tlab is, on average, | |
| 218 // 1/2 full at a GC | |
| 219 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
| 220 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
| 221 | |
| 222 _global_stats = new GlobalTLABStats(); | |
| 223 | |
| 224 // During jvm startup, the main (primordial) thread is initialized | |
| 225 // before the heap is initialized. So reinitialize it now. | |
| 226 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
| 227 Thread::current()->tlab().initialize(); | |
| 228 | |
| 229 if (PrintTLAB && Verbose) { | |
| 230 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
| 231 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
| 236 size_t init_sz; | |
| 237 | |
| 238 if (TLABSize > 0) { | |
| 239 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
| 240 } else if (global_stats() == NULL) { | |
| 241 // Startup issue - main thread initialized before heap initialized. | |
| 242 init_sz = min_size(); | |
| 243 } else { | |
| 244 // Initial size is a function of the average number of allocating threads. | |
| 245 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
| 246 | |
| 247 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
| 248 (nof_threads * target_refills()); | |
| 249 init_sz = align_object_size(init_sz); | |
| 250 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
| 251 } | |
| 252 return init_sz; | |
| 253 } | |
| 254 | |
| 255 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
| 256 Thread* thrd = myThread(); | |
| 257 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
| 258 size_t alloc = _number_of_refills * _desired_size; | |
| 259 double waste_percent = alloc == 0 ? 0.0 : | |
| 260 100.0 * waste / alloc; | |
| 17727 | 261 size_t tlab_used = Universe::heap()->tlab_used(thrd); |
| 0 | 262 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" |
| 263 " desired_size: " SIZE_FORMAT "KB" | |
| 264 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
| 265 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
| 266 " slow: %dB fast: %dB\n", | |
| 267 tag, thrd, thrd->osthread()->thread_id(), | |
| 268 _desired_size / (K / HeapWordSize), | |
| 269 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
| 270 _allocation_fraction.average(), | |
| 271 _allocation_fraction.average() * tlab_used / K, | |
| 272 _number_of_refills, waste_percent, | |
| 273 _gc_waste * HeapWordSize, | |
| 274 _slow_refill_waste * HeapWordSize, | |
| 275 _fast_refill_waste * HeapWordSize); | |
| 276 } | |
| 277 | |
| 278 void ThreadLocalAllocBuffer::verify() { | |
| 279 HeapWord* p = start(); | |
| 280 HeapWord* t = top(); | |
| 281 HeapWord* prev_p = NULL; | |
| 282 while (p < t) { | |
| 283 oop(p)->verify(); | |
| 284 prev_p = p; | |
| 285 p += oop(p)->size(); | |
| 286 } | |
| 287 guarantee(p == top(), "end of last object must match end of space"); | |
| 288 } | |
| 289 | |
| 290 Thread* ThreadLocalAllocBuffer::myThread() { | |
| 291 return (Thread*)(((char *)this) + | |
| 292 in_bytes(start_offset()) - | |
| 293 in_bytes(Thread::tlab_start_offset())); | |
| 294 } | |
| 295 | |
| 296 | |
| 297 GlobalTLABStats::GlobalTLABStats() : | |
| 298 _allocating_threads_avg(TLABAllocationWeight) { | |
| 299 | |
| 300 initialize(); | |
| 301 | |
| 302 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
| 303 | |
| 304 if (UsePerfData) { | |
| 305 | |
| 306 EXCEPTION_MARK; | |
| 307 ResourceMark rm; | |
| 308 | |
| 309 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
| 310 _perf_allocating_threads = | |
| 311 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 312 | |
| 313 cname = PerfDataManager::counter_name("tlab", "fills"); | |
| 314 _perf_total_refills = | |
| 315 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 316 | |
| 317 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
| 318 _perf_max_refills = | |
| 319 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 320 | |
| 321 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
| 322 _perf_allocation = | |
| 323 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 324 | |
| 325 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
| 326 _perf_gc_waste = | |
| 327 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 328 | |
| 329 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
| 330 _perf_max_gc_waste = | |
| 331 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 332 | |
| 333 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
| 334 _perf_slow_refill_waste = | |
| 335 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 336 | |
| 337 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
| 338 _perf_max_slow_refill_waste = | |
| 339 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 340 | |
| 341 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
| 342 _perf_fast_refill_waste = | |
| 343 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 344 | |
| 345 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
| 346 _perf_max_fast_refill_waste = | |
| 347 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 348 | |
| 349 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
| 350 _perf_slow_allocations = | |
| 351 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 352 | |
| 353 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
| 354 _perf_max_slow_allocations = | |
| 355 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 356 } | |
| 357 } | |
| 358 | |
| 359 void GlobalTLABStats::initialize() { | |
| 360 // Clear counters summarizing info from all threads | |
| 361 _allocating_threads = 0; | |
| 362 _total_refills = 0; | |
| 363 _max_refills = 0; | |
| 364 _total_allocation = 0; | |
| 365 _total_gc_waste = 0; | |
| 366 _max_gc_waste = 0; | |
| 367 _total_slow_refill_waste = 0; | |
| 368 _max_slow_refill_waste = 0; | |
| 369 _total_fast_refill_waste = 0; | |
| 370 _max_fast_refill_waste = 0; | |
| 371 _total_slow_allocations = 0; | |
| 372 _max_slow_allocations = 0; | |
| 373 } | |
| 374 | |
| 375 void GlobalTLABStats::publish() { | |
| 376 _allocating_threads_avg.sample(_allocating_threads); | |
| 377 if (UsePerfData) { | |
| 378 _perf_allocating_threads ->set_value(_allocating_threads); | |
| 379 _perf_total_refills ->set_value(_total_refills); | |
| 380 _perf_max_refills ->set_value(_max_refills); | |
| 381 _perf_allocation ->set_value(_total_allocation); | |
| 382 _perf_gc_waste ->set_value(_total_gc_waste); | |
| 383 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
| 384 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
| 385 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
| 386 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
| 387 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
| 388 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
| 389 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
| 390 } | |
| 391 } | |
| 392 | |
| 393 void GlobalTLABStats::print() { | |
| 394 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
| 395 double waste_percent = _total_allocation == 0 ? 0.0 : | |
| 396 100.0 * waste / _total_allocation; | |
| 397 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
| 398 " slow allocs: %d max %d waste: %4.1f%%" | |
| 399 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 400 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 401 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
| 402 _allocating_threads, | |
| 403 _total_refills, _max_refills, | |
| 404 _total_slow_allocations, _max_slow_allocations, | |
| 405 waste_percent, | |
| 406 _total_gc_waste * HeapWordSize, | |
| 407 _max_gc_waste * HeapWordSize, | |
| 408 _total_slow_refill_waste * HeapWordSize, | |
| 409 _max_slow_refill_waste * HeapWordSize, | |
| 410 _total_fast_refill_waste * HeapWordSize, | |
| 411 _max_fast_refill_waste * HeapWordSize); | |
| 412 } |