Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 18697:ee26b8eb1601
Check for overzeroing in the TLAB
| author | Tom Rodriguez <tom.rodriguez@oracle.com> |
|---|---|
| date | Tue, 16 Dec 2014 13:28:33 -0800 |
| parents | 52b4284cb496 |
| children | 8f2fb6bec986 |
| 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(); | |
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57 #ifdef GRAAL |
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58 for (jint i = 0; i < thread->get_gpu_hsail_tlabs_count(); i++) { |
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59 thread->get_gpu_hsail_tlab_at(i)->accumulate_statistics(); |
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60 thread->get_gpu_hsail_tlab_at(i)->initialize_statistics(); |
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61 } |
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62 #endif |
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63 |
| 0 | 64 } |
| 65 | |
| 66 // Publish new stats if some allocation occurred. | |
| 67 if (global_stats()->allocation() != 0) { | |
| 68 global_stats()->publish(); | |
| 69 if (PrintTLAB) { | |
| 70 global_stats()->print(); | |
| 71 } | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
| 14310 | 76 Thread* thread = myThread(); |
| 77 size_t capacity = Universe::heap()->tlab_capacity(thread); | |
| 78 size_t used = Universe::heap()->tlab_used(thread); | |
| 0 | 79 |
| 80 _gc_waste += (unsigned)remaining(); | |
| 14310 | 81 size_t total_allocated = thread->allocated_bytes(); |
| 82 size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc; | |
| 83 _allocated_before_last_gc = total_allocated; | |
| 0 | 84 |
| 85 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
| 86 print_stats("gc"); | |
| 87 } | |
| 88 | |
| 89 if (_number_of_refills > 0) { | |
| 14310 | 90 // Update allocation history if a reasonable amount of eden was allocated. |
| 91 bool update_allocation_history = used > 0.5 * capacity; | |
| 0 | 92 |
| 93 if (update_allocation_history) { | |
| 94 // Average the fraction of eden allocated in a tlab by this | |
| 95 // thread for use in the next resize operation. | |
| 96 // _gc_waste is not subtracted because it's included in | |
| 97 // "used". | |
| 14310 | 98 // The result can be larger than 1.0 due to direct to old allocations. |
| 99 // These allocations should ideally not be counted but since it is not possible | |
| 100 // to filter them out here we just cap the fraction to be at most 1.0. | |
| 101 double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used); | |
| 0 | 102 _allocation_fraction.sample(alloc_frac); |
| 103 } | |
| 104 global_stats()->update_allocating_threads(); | |
| 105 global_stats()->update_number_of_refills(_number_of_refills); | |
| 106 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
| 107 global_stats()->update_gc_waste(_gc_waste); | |
| 108 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
| 109 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
| 110 | |
| 111 } else { | |
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112 // (ds) _gc_waste can be non-zero (see above) even if _number_of_refills is 0 |
| 0 | 113 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && |
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114 _slow_refill_waste == 0/* && _gc_waste == 0*/, |
| 0 | 115 "tlab stats == 0"); |
| 116 } | |
| 117 global_stats()->update_slow_allocations(_slow_allocations); | |
| 118 } | |
| 119 | |
| 120 // Fills the current tlab with a dummy filler array to create | |
| 121 // an illusion of a contiguous Eden and optionally retires the tlab. | |
| 122 // Waste accounting should be done in caller as appropriate; see, | |
| 123 // for example, clear_before_allocation(). | |
| 124 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
| 125 if (end() != NULL) { | |
| 126 invariants(); | |
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127 |
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128 if (retire) { |
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129 myThread()->incr_allocated_bytes(used_bytes()); |
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130 } |
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131 |
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132 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
| 0 | 133 |
| 134 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
| 135 set_start(NULL); | |
| 136 set_top(NULL); | |
| 137 set_pf_top(NULL); | |
| 138 set_end(NULL); | |
| 139 } | |
| 140 } | |
| 141 assert(!(retire || ZeroTLAB) || | |
| 142 (start() == NULL && end() == NULL && top() == NULL), | |
| 143 "TLAB must be reset"); | |
| 144 } | |
| 145 | |
| 146 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
| 14310 | 147 if (ResizeTLAB) { |
| 148 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 149 thread->tlab().resize(); | |
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150 #ifdef GRAAL |
| 18041 | 151 for (jint i = 0; i < thread->get_gpu_hsail_tlabs_count(); i++) { |
| 152 thread->get_gpu_hsail_tlab_at(i)->resize(); | |
| 153 } | |
| 154 #endif | |
| 14310 | 155 } |
| 0 | 156 } |
| 157 } | |
| 158 | |
| 159 void ThreadLocalAllocBuffer::resize() { | |
| 14310 | 160 // Compute the next tlab size using expected allocation amount |
| 161 assert(ResizeTLAB, "Should not call this otherwise"); | |
| 162 size_t alloc = (size_t)(_allocation_fraction.average() * | |
| 163 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
| 164 size_t new_size = alloc / _target_refills; | |
| 0 | 165 |
| 14310 | 166 new_size = MIN2(MAX2(new_size, min_size()), max_size()); |
| 0 | 167 |
| 14310 | 168 size_t aligned_new_size = align_object_size(new_size); |
| 0 | 169 |
| 14310 | 170 if (PrintTLAB && Verbose) { |
| 171 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
| 172 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
| 173 myThread(), myThread()->osthread()->thread_id(), | |
| 174 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
| 0 | 175 } |
| 14310 | 176 set_desired_size(aligned_new_size); |
| 177 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 0 | 178 } |
| 179 | |
| 180 void ThreadLocalAllocBuffer::initialize_statistics() { | |
| 181 _number_of_refills = 0; | |
| 182 _fast_refill_waste = 0; | |
| 183 _slow_refill_waste = 0; | |
| 184 _gc_waste = 0; | |
| 185 _slow_allocations = 0; | |
| 186 } | |
| 187 | |
| 188 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
| 189 HeapWord* top, | |
| 190 size_t new_size) { | |
| 191 _number_of_refills++; | |
| 192 if (PrintTLAB && Verbose) { | |
| 193 print_stats("fill"); | |
| 194 } | |
| 195 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
| 196 initialize(start, top, start + new_size - alignment_reserve()); | |
| 197 | |
| 198 // Reset amount of internal fragmentation | |
| 199 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 200 } | |
| 201 | |
| 202 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
| 203 HeapWord* top, | |
| 204 HeapWord* end) { | |
| 205 set_start(start); | |
| 206 set_top(top); | |
| 207 set_pf_top(top); | |
| 208 set_end(end); | |
| 209 invariants(); | |
| 210 } | |
| 211 | |
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212 void ThreadLocalAllocBuffer::initialize(Thread* owning_thread) { |
| 0 | 213 initialize(NULL, // start |
| 214 NULL, // top | |
| 215 NULL); // end | |
| 216 | |
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217 _owning_thread = owning_thread; |
| 0 | 218 set_desired_size(initial_desired_size()); |
| 219 | |
| 220 // Following check is needed because at startup the main (primordial) | |
| 221 // thread is initialized before the heap is. The initialization for | |
| 222 // this thread is redone in startup_initialization below. | |
| 223 if (Universe::heap() != NULL) { | |
| 224 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
| 225 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
| 226 _allocation_fraction.sample(alloc_frac); | |
| 227 } | |
| 228 | |
| 229 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 230 | |
| 231 initialize_statistics(); | |
| 232 } | |
| 233 | |
| 234 void ThreadLocalAllocBuffer::startup_initialization() { | |
| 235 | |
| 236 // Assuming each thread's active tlab is, on average, | |
| 237 // 1/2 full at a GC | |
| 238 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
| 239 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
| 240 | |
| 241 _global_stats = new GlobalTLABStats(); | |
| 242 | |
| 243 // During jvm startup, the main (primordial) thread is initialized | |
| 244 // before the heap is initialized. So reinitialize it now. | |
| 245 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
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246 Thread::current()->tlab().initialize(Thread::current()); |
| 0 | 247 |
| 248 if (PrintTLAB && Verbose) { | |
| 249 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
| 250 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
| 255 size_t init_sz; | |
| 256 | |
| 257 if (TLABSize > 0) { | |
| 258 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
| 259 } else if (global_stats() == NULL) { | |
| 260 // Startup issue - main thread initialized before heap initialized. | |
| 261 init_sz = min_size(); | |
| 262 } else { | |
| 263 // Initial size is a function of the average number of allocating threads. | |
| 264 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
| 265 | |
| 266 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
| 267 (nof_threads * target_refills()); | |
| 268 init_sz = align_object_size(init_sz); | |
| 269 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
| 270 } | |
| 271 return init_sz; | |
| 272 } | |
| 273 | |
| 274 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
| 275 Thread* thrd = myThread(); | |
| 276 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
| 277 size_t alloc = _number_of_refills * _desired_size; | |
| 278 double waste_percent = alloc == 0 ? 0.0 : | |
| 279 100.0 * waste / alloc; | |
| 14310 | 280 size_t tlab_used = Universe::heap()->tlab_used(thrd); |
| 0 | 281 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" |
| 282 " desired_size: " SIZE_FORMAT "KB" | |
| 283 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
| 284 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
| 285 " slow: %dB fast: %dB\n", | |
| 286 tag, thrd, thrd->osthread()->thread_id(), | |
| 287 _desired_size / (K / HeapWordSize), | |
| 288 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
| 289 _allocation_fraction.average(), | |
| 290 _allocation_fraction.average() * tlab_used / K, | |
| 291 _number_of_refills, waste_percent, | |
| 292 _gc_waste * HeapWordSize, | |
| 293 _slow_refill_waste * HeapWordSize, | |
| 294 _fast_refill_waste * HeapWordSize); | |
| 295 } | |
| 296 | |
| 297 void ThreadLocalAllocBuffer::verify() { | |
| 298 HeapWord* p = start(); | |
| 299 HeapWord* t = top(); | |
| 300 HeapWord* prev_p = NULL; | |
| 301 while (p < t) { | |
| 302 oop(p)->verify(); | |
| 303 prev_p = p; | |
| 304 p += oop(p)->size(); | |
| 305 } | |
| 306 guarantee(p == top(), "end of last object must match end of space"); | |
| 307 } | |
| 308 | |
| 309 Thread* ThreadLocalAllocBuffer::myThread() { | |
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310 return _owning_thread; |
| 0 | 311 } |
| 312 | |
| 313 | |
| 314 GlobalTLABStats::GlobalTLABStats() : | |
| 315 _allocating_threads_avg(TLABAllocationWeight) { | |
| 316 | |
| 317 initialize(); | |
| 318 | |
| 319 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
| 320 | |
| 321 if (UsePerfData) { | |
| 322 | |
| 323 EXCEPTION_MARK; | |
| 324 ResourceMark rm; | |
| 325 | |
| 326 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
| 327 _perf_allocating_threads = | |
| 328 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 329 | |
| 330 cname = PerfDataManager::counter_name("tlab", "fills"); | |
| 331 _perf_total_refills = | |
| 332 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 333 | |
| 334 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
| 335 _perf_max_refills = | |
| 336 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 337 | |
| 338 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
| 339 _perf_allocation = | |
| 340 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 341 | |
| 342 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
| 343 _perf_gc_waste = | |
| 344 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 345 | |
| 346 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
| 347 _perf_max_gc_waste = | |
| 348 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 349 | |
| 350 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
| 351 _perf_slow_refill_waste = | |
| 352 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 353 | |
| 354 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
| 355 _perf_max_slow_refill_waste = | |
| 356 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 357 | |
| 358 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
| 359 _perf_fast_refill_waste = | |
| 360 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 361 | |
| 362 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
| 363 _perf_max_fast_refill_waste = | |
| 364 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 365 | |
| 366 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
| 367 _perf_slow_allocations = | |
| 368 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 369 | |
| 370 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
| 371 _perf_max_slow_allocations = | |
| 372 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 void GlobalTLABStats::initialize() { | |
| 377 // Clear counters summarizing info from all threads | |
| 378 _allocating_threads = 0; | |
| 379 _total_refills = 0; | |
| 380 _max_refills = 0; | |
| 381 _total_allocation = 0; | |
| 382 _total_gc_waste = 0; | |
| 383 _max_gc_waste = 0; | |
| 384 _total_slow_refill_waste = 0; | |
| 385 _max_slow_refill_waste = 0; | |
| 386 _total_fast_refill_waste = 0; | |
| 387 _max_fast_refill_waste = 0; | |
| 388 _total_slow_allocations = 0; | |
| 389 _max_slow_allocations = 0; | |
| 390 } | |
| 391 | |
| 392 void GlobalTLABStats::publish() { | |
| 393 _allocating_threads_avg.sample(_allocating_threads); | |
| 394 if (UsePerfData) { | |
| 395 _perf_allocating_threads ->set_value(_allocating_threads); | |
| 396 _perf_total_refills ->set_value(_total_refills); | |
| 397 _perf_max_refills ->set_value(_max_refills); | |
| 398 _perf_allocation ->set_value(_total_allocation); | |
| 399 _perf_gc_waste ->set_value(_total_gc_waste); | |
| 400 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
| 401 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
| 402 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
| 403 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
| 404 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
| 405 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
| 406 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
| 407 } | |
| 408 } | |
| 409 | |
| 410 void GlobalTLABStats::print() { | |
| 411 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
| 412 double waste_percent = _total_allocation == 0 ? 0.0 : | |
| 413 100.0 * waste / _total_allocation; | |
| 414 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
| 415 " slow allocs: %d max %d waste: %4.1f%%" | |
| 416 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 417 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 418 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
| 419 _allocating_threads, | |
| 420 _total_refills, _max_refills, | |
| 421 _total_slow_allocations, _max_slow_allocations, | |
| 422 waste_percent, | |
| 423 _total_gc_waste * HeapWordSize, | |
| 424 _max_gc_waste * HeapWordSize, | |
| 425 _total_slow_refill_waste * HeapWordSize, | |
| 426 _max_slow_refill_waste * HeapWordSize, | |
| 427 _total_fast_refill_waste * HeapWordSize, | |
| 428 _max_fast_refill_waste * HeapWordSize); | |
| 429 } |