Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Tue, 07 Apr 2015 14:58:49 +0200 |
| parents | 8f2fb6bec986 060cdf93040c |
| children | 2fd31d8e6b58 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2014, 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 |
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34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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35 |
| 1972 | 36 // Thread-Local Edens support |
| 0 | 37 |
| 38 // static member initialization | |
| 14310 | 39 size_t ThreadLocalAllocBuffer::_max_size = 0; |
| 0 | 40 unsigned ThreadLocalAllocBuffer::_target_refills = 0; |
| 41 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL; | |
| 42 | |
| 43 void ThreadLocalAllocBuffer::clear_before_allocation() { | |
| 44 _slow_refill_waste += (unsigned)remaining(); | |
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45 // In debug mode we expect the storage above top to be uninitialized |
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46 // or filled with a padding object. |
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47 assert(top() == NULL || *(intptr_t*)top() != 0, "overzeroing detected"); |
| 0 | 48 make_parsable(true); // also retire the TLAB |
| 49 } | |
| 50 | |
| 51 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
| 52 global_stats()->initialize(); | |
| 53 | |
| 14310 | 54 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { |
| 0 | 55 thread->tlab().accumulate_statistics(); |
| 56 thread->tlab().initialize_statistics(); | |
| 57 } | |
| 58 | |
| 59 // Publish new stats if some allocation occurred. | |
| 60 if (global_stats()->allocation() != 0) { | |
| 61 global_stats()->publish(); | |
| 62 if (PrintTLAB) { | |
| 63 global_stats()->print(); | |
| 64 } | |
| 65 } | |
| 66 } | |
| 67 | |
| 68 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
| 14310 | 69 Thread* thread = myThread(); |
| 70 size_t capacity = Universe::heap()->tlab_capacity(thread); | |
| 71 size_t used = Universe::heap()->tlab_used(thread); | |
| 0 | 72 |
| 73 _gc_waste += (unsigned)remaining(); | |
| 14310 | 74 size_t total_allocated = thread->allocated_bytes(); |
| 75 size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc; | |
| 76 _allocated_before_last_gc = total_allocated; | |
| 0 | 77 |
| 78 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
| 79 print_stats("gc"); | |
| 80 } | |
| 81 | |
| 82 if (_number_of_refills > 0) { | |
| 14310 | 83 // Update allocation history if a reasonable amount of eden was allocated. |
| 84 bool update_allocation_history = used > 0.5 * capacity; | |
| 0 | 85 |
| 86 if (update_allocation_history) { | |
| 87 // Average the fraction of eden allocated in a tlab by this | |
| 88 // thread for use in the next resize operation. | |
| 89 // _gc_waste is not subtracted because it's included in | |
| 90 // "used". | |
| 14310 | 91 // The result can be larger than 1.0 due to direct to old allocations. |
| 92 // These allocations should ideally not be counted but since it is not possible | |
| 93 // to filter them out here we just cap the fraction to be at most 1.0. | |
| 94 double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used); | |
| 0 | 95 _allocation_fraction.sample(alloc_frac); |
| 96 } | |
| 97 global_stats()->update_allocating_threads(); | |
| 98 global_stats()->update_number_of_refills(_number_of_refills); | |
| 99 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
| 100 global_stats()->update_gc_waste(_gc_waste); | |
| 101 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
| 102 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
| 103 | |
| 104 } else { | |
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105 // (ds) _gc_waste can be non-zero (see above) even if _number_of_refills is 0 |
| 0 | 106 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && |
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107 _slow_refill_waste == 0/* && _gc_waste == 0*/, |
| 0 | 108 "tlab stats == 0"); |
| 109 } | |
| 110 global_stats()->update_slow_allocations(_slow_allocations); | |
| 111 } | |
| 112 | |
| 113 // Fills the current tlab with a dummy filler array to create | |
| 114 // an illusion of a contiguous Eden and optionally retires the tlab. | |
| 115 // Waste accounting should be done in caller as appropriate; see, | |
| 116 // for example, clear_before_allocation(). | |
| 117 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
| 118 if (end() != NULL) { | |
| 119 invariants(); | |
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120 |
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121 if (retire) { |
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122 myThread()->incr_allocated_bytes(used_bytes()); |
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123 } |
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124 |
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125 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
| 0 | 126 |
| 127 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
| 128 set_start(NULL); | |
| 129 set_top(NULL); | |
| 130 set_pf_top(NULL); | |
| 131 set_end(NULL); | |
| 132 } | |
| 133 } | |
| 134 assert(!(retire || ZeroTLAB) || | |
| 135 (start() == NULL && end() == NULL && top() == NULL), | |
| 136 "TLAB must be reset"); | |
| 137 } | |
| 138 | |
| 139 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
| 14310 | 140 if (ResizeTLAB) { |
| 141 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 142 thread->tlab().resize(); | |
| 143 } | |
| 0 | 144 } |
| 145 } | |
| 146 | |
| 147 void ThreadLocalAllocBuffer::resize() { | |
| 14310 | 148 // Compute the next tlab size using expected allocation amount |
| 149 assert(ResizeTLAB, "Should not call this otherwise"); | |
| 150 size_t alloc = (size_t)(_allocation_fraction.average() * | |
| 151 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
| 152 size_t new_size = alloc / _target_refills; | |
| 0 | 153 |
| 14310 | 154 new_size = MIN2(MAX2(new_size, min_size()), max_size()); |
| 0 | 155 |
| 14310 | 156 size_t aligned_new_size = align_object_size(new_size); |
| 0 | 157 |
| 14310 | 158 if (PrintTLAB && Verbose) { |
| 159 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
| 160 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
| 161 myThread(), myThread()->osthread()->thread_id(), | |
| 162 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
| 0 | 163 } |
| 14310 | 164 set_desired_size(aligned_new_size); |
| 165 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 0 | 166 } |
| 167 | |
| 168 void ThreadLocalAllocBuffer::initialize_statistics() { | |
| 169 _number_of_refills = 0; | |
| 170 _fast_refill_waste = 0; | |
| 171 _slow_refill_waste = 0; | |
| 172 _gc_waste = 0; | |
| 173 _slow_allocations = 0; | |
| 174 } | |
| 175 | |
| 176 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
| 177 HeapWord* top, | |
| 178 size_t new_size) { | |
| 179 _number_of_refills++; | |
| 180 if (PrintTLAB && Verbose) { | |
| 181 print_stats("fill"); | |
| 182 } | |
| 183 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
| 184 initialize(start, top, start + new_size - alignment_reserve()); | |
| 185 | |
| 186 // Reset amount of internal fragmentation | |
| 187 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 188 } | |
| 189 | |
| 190 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
| 191 HeapWord* top, | |
| 192 HeapWord* end) { | |
| 193 set_start(start); | |
| 194 set_top(top); | |
| 195 set_pf_top(top); | |
| 196 set_end(end); | |
| 197 invariants(); | |
| 198 } | |
| 199 | |
| 200 void ThreadLocalAllocBuffer::initialize() { | |
| 201 initialize(NULL, // start | |
| 202 NULL, // top | |
| 203 NULL); // end | |
| 204 | |
| 205 set_desired_size(initial_desired_size()); | |
| 206 | |
| 207 // Following check is needed because at startup the main (primordial) | |
| 208 // thread is initialized before the heap is. The initialization for | |
| 209 // this thread is redone in startup_initialization below. | |
| 210 if (Universe::heap() != NULL) { | |
| 211 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
| 212 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
| 213 _allocation_fraction.sample(alloc_frac); | |
| 214 } | |
| 215 | |
| 216 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 217 | |
| 218 initialize_statistics(); | |
| 219 } | |
| 220 | |
| 221 void ThreadLocalAllocBuffer::startup_initialization() { | |
| 222 | |
| 223 // Assuming each thread's active tlab is, on average, | |
| 224 // 1/2 full at a GC | |
| 225 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
| 226 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
| 227 | |
| 228 _global_stats = new GlobalTLABStats(); | |
| 229 | |
| 230 // During jvm startup, the main (primordial) thread is initialized | |
| 231 // before the heap is initialized. So reinitialize it now. | |
| 232 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
| 233 Thread::current()->tlab().initialize(); | |
| 234 | |
| 235 if (PrintTLAB && Verbose) { | |
| 236 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
| 237 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
| 238 } | |
| 239 } | |
| 240 | |
| 241 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
| 20756 | 242 size_t init_sz = 0; |
| 0 | 243 |
| 244 if (TLABSize > 0) { | |
| 20756 | 245 init_sz = TLABSize / HeapWordSize; |
| 246 } else if (global_stats() != NULL) { | |
| 0 | 247 // Initial size is a function of the average number of allocating threads. |
| 248 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
| 249 | |
| 250 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
| 251 (nof_threads * target_refills()); | |
| 252 init_sz = align_object_size(init_sz); | |
| 253 } | |
| 20756 | 254 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); |
| 0 | 255 return init_sz; |
| 256 } | |
| 257 | |
| 258 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
| 259 Thread* thrd = myThread(); | |
| 260 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
| 261 size_t alloc = _number_of_refills * _desired_size; | |
| 262 double waste_percent = alloc == 0 ? 0.0 : | |
| 263 100.0 * waste / alloc; | |
| 14310 | 264 size_t tlab_used = Universe::heap()->tlab_used(thrd); |
| 0 | 265 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" |
| 266 " desired_size: " SIZE_FORMAT "KB" | |
| 267 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
| 268 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
| 269 " slow: %dB fast: %dB\n", | |
| 270 tag, thrd, thrd->osthread()->thread_id(), | |
| 271 _desired_size / (K / HeapWordSize), | |
| 272 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
| 273 _allocation_fraction.average(), | |
| 274 _allocation_fraction.average() * tlab_used / K, | |
| 275 _number_of_refills, waste_percent, | |
| 276 _gc_waste * HeapWordSize, | |
| 277 _slow_refill_waste * HeapWordSize, | |
| 278 _fast_refill_waste * HeapWordSize); | |
| 279 } | |
| 280 | |
| 281 void ThreadLocalAllocBuffer::verify() { | |
| 282 HeapWord* p = start(); | |
| 283 HeapWord* t = top(); | |
| 284 HeapWord* prev_p = NULL; | |
| 285 while (p < t) { | |
| 286 oop(p)->verify(); | |
| 287 prev_p = p; | |
| 288 p += oop(p)->size(); | |
| 289 } | |
| 290 guarantee(p == top(), "end of last object must match end of space"); | |
| 291 } | |
| 292 | |
| 293 Thread* ThreadLocalAllocBuffer::myThread() { | |
| 294 return (Thread*)(((char *)this) + | |
| 295 in_bytes(start_offset()) - | |
| 296 in_bytes(Thread::tlab_start_offset())); | |
| 297 } | |
| 298 | |
| 299 | |
| 300 GlobalTLABStats::GlobalTLABStats() : | |
| 301 _allocating_threads_avg(TLABAllocationWeight) { | |
| 302 | |
| 303 initialize(); | |
| 304 | |
| 305 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
| 306 | |
| 307 if (UsePerfData) { | |
| 308 | |
| 309 EXCEPTION_MARK; | |
| 310 ResourceMark rm; | |
| 311 | |
| 312 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
| 313 _perf_allocating_threads = | |
| 314 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 315 | |
| 316 cname = PerfDataManager::counter_name("tlab", "fills"); | |
| 317 _perf_total_refills = | |
| 318 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 319 | |
| 320 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
| 321 _perf_max_refills = | |
| 322 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 323 | |
| 324 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
| 325 _perf_allocation = | |
| 326 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 327 | |
| 328 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
| 329 _perf_gc_waste = | |
| 330 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 331 | |
| 332 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
| 333 _perf_max_gc_waste = | |
| 334 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 335 | |
| 336 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
| 337 _perf_slow_refill_waste = | |
| 338 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 339 | |
| 340 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
| 341 _perf_max_slow_refill_waste = | |
| 342 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 343 | |
| 344 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
| 345 _perf_fast_refill_waste = | |
| 346 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 347 | |
| 348 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
| 349 _perf_max_fast_refill_waste = | |
| 350 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 351 | |
| 352 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
| 353 _perf_slow_allocations = | |
| 354 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 355 | |
| 356 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
| 357 _perf_max_slow_allocations = | |
| 358 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 359 } | |
| 360 } | |
| 361 | |
| 362 void GlobalTLABStats::initialize() { | |
| 363 // Clear counters summarizing info from all threads | |
| 364 _allocating_threads = 0; | |
| 365 _total_refills = 0; | |
| 366 _max_refills = 0; | |
| 367 _total_allocation = 0; | |
| 368 _total_gc_waste = 0; | |
| 369 _max_gc_waste = 0; | |
| 370 _total_slow_refill_waste = 0; | |
| 371 _max_slow_refill_waste = 0; | |
| 372 _total_fast_refill_waste = 0; | |
| 373 _max_fast_refill_waste = 0; | |
| 374 _total_slow_allocations = 0; | |
| 375 _max_slow_allocations = 0; | |
| 376 } | |
| 377 | |
| 378 void GlobalTLABStats::publish() { | |
| 379 _allocating_threads_avg.sample(_allocating_threads); | |
| 380 if (UsePerfData) { | |
| 381 _perf_allocating_threads ->set_value(_allocating_threads); | |
| 382 _perf_total_refills ->set_value(_total_refills); | |
| 383 _perf_max_refills ->set_value(_max_refills); | |
| 384 _perf_allocation ->set_value(_total_allocation); | |
| 385 _perf_gc_waste ->set_value(_total_gc_waste); | |
| 386 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
| 387 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
| 388 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
| 389 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
| 390 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
| 391 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
| 392 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 void GlobalTLABStats::print() { | |
| 397 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
| 398 double waste_percent = _total_allocation == 0 ? 0.0 : | |
| 399 100.0 * waste / _total_allocation; | |
| 400 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
| 401 " slow allocs: %d max %d waste: %4.1f%%" | |
| 402 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 403 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 404 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
| 405 _allocating_threads, | |
| 406 _total_refills, _max_refills, | |
| 407 _total_slow_allocations, _max_slow_allocations, | |
| 408 waste_percent, | |
| 409 _total_gc_waste * HeapWordSize, | |
| 410 _max_gc_waste * HeapWordSize, | |
| 411 _total_slow_refill_waste * HeapWordSize, | |
| 412 _max_slow_refill_waste * HeapWordSize, | |
| 413 _total_fast_refill_waste * HeapWordSize, | |
| 414 _max_fast_refill_waste * HeapWordSize); | |
| 415 } |