Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 2426:1d1603768966
7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
Summary: Update the copyright to be 2010 on all changed files in OpenJDK
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Tue, 05 Apr 2011 14:12:31 -0700 |
| parents | b1a2afa37ec4 |
| children | f08d439fab8c |
| 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" | |
| 31 #include "utilities/copy.hpp" | |
| 32 #ifdef TARGET_OS_FAMILY_linux | |
| 33 # include "thread_linux.inline.hpp" | |
| 34 #endif | |
| 35 #ifdef TARGET_OS_FAMILY_solaris | |
| 36 # include "thread_solaris.inline.hpp" | |
| 37 #endif | |
| 38 #ifdef TARGET_OS_FAMILY_windows | |
| 39 # include "thread_windows.inline.hpp" | |
| 40 #endif | |
| 0 | 41 |
| 1972 | 42 // Thread-Local Edens support |
| 0 | 43 |
| 44 // static member initialization | |
| 45 unsigned ThreadLocalAllocBuffer::_target_refills = 0; | |
| 46 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL; | |
| 47 | |
| 48 void ThreadLocalAllocBuffer::clear_before_allocation() { | |
| 49 _slow_refill_waste += (unsigned)remaining(); | |
| 50 make_parsable(true); // also retire the TLAB | |
| 51 } | |
| 52 | |
| 53 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
| 54 global_stats()->initialize(); | |
| 55 | |
| 56 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
| 57 thread->tlab().accumulate_statistics(); | |
| 58 thread->tlab().initialize_statistics(); | |
| 59 } | |
| 60 | |
| 61 // Publish new stats if some allocation occurred. | |
| 62 if (global_stats()->allocation() != 0) { | |
| 63 global_stats()->publish(); | |
| 64 if (PrintTLAB) { | |
| 65 global_stats()->print(); | |
| 66 } | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
| 71 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
| 72 size_t unused = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / HeapWordSize; | |
| 73 size_t used = capacity - unused; | |
| 74 | |
| 75 // Update allocation history if a reasonable amount of eden was allocated. | |
| 76 bool update_allocation_history = used > 0.5 * capacity; | |
| 77 | |
| 78 _gc_waste += (unsigned)remaining(); | |
| 79 | |
| 80 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
| 81 print_stats("gc"); | |
| 82 } | |
| 83 | |
| 84 if (_number_of_refills > 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". | |
| 91 size_t allocation = _number_of_refills * desired_size(); | |
| 92 double alloc_frac = allocation / (double) used; | |
| 93 _allocation_fraction.sample(alloc_frac); | |
| 94 } | |
| 95 global_stats()->update_allocating_threads(); | |
| 96 global_stats()->update_number_of_refills(_number_of_refills); | |
| 97 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
| 98 global_stats()->update_gc_waste(_gc_waste); | |
| 99 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
| 100 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
| 101 | |
| 102 } else { | |
| 103 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && | |
| 104 _slow_refill_waste == 0 && _gc_waste == 0, | |
| 105 "tlab stats == 0"); | |
| 106 } | |
| 107 global_stats()->update_slow_allocations(_slow_allocations); | |
| 108 } | |
| 109 | |
| 110 // Fills the current tlab with a dummy filler array to create | |
| 111 // an illusion of a contiguous Eden and optionally retires the tlab. | |
| 112 // Waste accounting should be done in caller as appropriate; see, | |
| 113 // for example, clear_before_allocation(). | |
| 114 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
| 115 if (end() != NULL) { | |
| 116 invariants(); | |
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117 |
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118 if (retire) { |
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119 myThread()->incr_allocated_bytes(used_bytes()); |
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120 } |
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121 |
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122 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
| 0 | 123 |
| 124 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
| 125 set_start(NULL); | |
| 126 set_top(NULL); | |
| 127 set_pf_top(NULL); | |
| 128 set_end(NULL); | |
| 129 } | |
| 130 } | |
| 131 assert(!(retire || ZeroTLAB) || | |
| 132 (start() == NULL && end() == NULL && top() == NULL), | |
| 133 "TLAB must be reset"); | |
| 134 } | |
| 135 | |
| 136 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
| 137 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
| 138 thread->tlab().resize(); | |
| 139 } | |
| 140 } | |
| 141 | |
| 142 void ThreadLocalAllocBuffer::resize() { | |
| 143 | |
| 144 if (ResizeTLAB) { | |
| 145 // Compute the next tlab size using expected allocation amount | |
| 146 size_t alloc = (size_t)(_allocation_fraction.average() * | |
| 147 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
| 148 size_t new_size = alloc / _target_refills; | |
| 149 | |
| 150 new_size = MIN2(MAX2(new_size, min_size()), max_size()); | |
| 151 | |
| 152 size_t aligned_new_size = align_object_size(new_size); | |
| 153 | |
| 154 if (PrintTLAB && Verbose) { | |
| 155 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
| 156 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
| 157 myThread(), myThread()->osthread()->thread_id(), | |
| 158 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
| 159 } | |
| 160 set_desired_size(aligned_new_size); | |
| 161 | |
| 162 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 163 } | |
| 164 } | |
| 165 | |
| 166 void ThreadLocalAllocBuffer::initialize_statistics() { | |
| 167 _number_of_refills = 0; | |
| 168 _fast_refill_waste = 0; | |
| 169 _slow_refill_waste = 0; | |
| 170 _gc_waste = 0; | |
| 171 _slow_allocations = 0; | |
| 172 } | |
| 173 | |
| 174 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
| 175 HeapWord* top, | |
| 176 size_t new_size) { | |
| 177 _number_of_refills++; | |
| 178 if (PrintTLAB && Verbose) { | |
| 179 print_stats("fill"); | |
| 180 } | |
| 181 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
| 182 initialize(start, top, start + new_size - alignment_reserve()); | |
| 183 | |
| 184 // Reset amount of internal fragmentation | |
| 185 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 186 } | |
| 187 | |
| 188 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
| 189 HeapWord* top, | |
| 190 HeapWord* end) { | |
| 191 set_start(start); | |
| 192 set_top(top); | |
| 193 set_pf_top(top); | |
| 194 set_end(end); | |
| 195 invariants(); | |
| 196 } | |
| 197 | |
| 198 void ThreadLocalAllocBuffer::initialize() { | |
| 199 initialize(NULL, // start | |
| 200 NULL, // top | |
| 201 NULL); // end | |
| 202 | |
| 203 set_desired_size(initial_desired_size()); | |
| 204 | |
| 205 // Following check is needed because at startup the main (primordial) | |
| 206 // thread is initialized before the heap is. The initialization for | |
| 207 // this thread is redone in startup_initialization below. | |
| 208 if (Universe::heap() != NULL) { | |
| 209 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
| 210 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
| 211 _allocation_fraction.sample(alloc_frac); | |
| 212 } | |
| 213 | |
| 214 set_refill_waste_limit(initial_refill_waste_limit()); | |
| 215 | |
| 216 initialize_statistics(); | |
| 217 } | |
| 218 | |
| 219 void ThreadLocalAllocBuffer::startup_initialization() { | |
| 220 | |
| 221 // Assuming each thread's active tlab is, on average, | |
| 222 // 1/2 full at a GC | |
| 223 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
| 224 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
| 225 | |
| 226 _global_stats = new GlobalTLABStats(); | |
| 227 | |
| 228 // During jvm startup, the main (primordial) thread is initialized | |
| 229 // before the heap is initialized. So reinitialize it now. | |
| 230 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
| 231 Thread::current()->tlab().initialize(); | |
| 232 | |
| 233 if (PrintTLAB && Verbose) { | |
| 234 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
| 235 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
| 236 } | |
| 237 } | |
| 238 | |
| 239 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
| 240 size_t init_sz; | |
| 241 | |
| 242 if (TLABSize > 0) { | |
| 243 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
| 244 } else if (global_stats() == NULL) { | |
| 245 // Startup issue - main thread initialized before heap initialized. | |
| 246 init_sz = min_size(); | |
| 247 } else { | |
| 248 // Initial size is a function of the average number of allocating threads. | |
| 249 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
| 250 | |
| 251 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
| 252 (nof_threads * target_refills()); | |
| 253 init_sz = align_object_size(init_sz); | |
| 254 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
| 255 } | |
| 256 return init_sz; | |
| 257 } | |
| 258 | |
| 259 const size_t ThreadLocalAllocBuffer::max_size() { | |
| 260 | |
| 261 // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE]. | |
| 262 // This restriction could be removed by enabling filling with multiple arrays. | |
| 263 // If we compute that the reasonable way as | |
| 264 // header_size + ((sizeof(jint) * max_jint) / HeapWordSize) | |
| 265 // we'll overflow on the multiply, so we do the divide first. | |
| 266 // We actually lose a little by dividing first, | |
| 267 // but that just makes the TLAB somewhat smaller than the biggest array, | |
| 268 // which is fine, since we'll be able to fill that. | |
| 269 | |
| 270 size_t unaligned_max_size = typeArrayOopDesc::header_size(T_INT) + | |
| 271 sizeof(jint) * | |
| 272 ((juint) max_jint / (size_t) HeapWordSize); | |
| 273 return align_size_down(unaligned_max_size, MinObjAlignment); | |
| 274 } | |
| 275 | |
| 276 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
| 277 Thread* thrd = myThread(); | |
| 278 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
| 279 size_t alloc = _number_of_refills * _desired_size; | |
| 280 double waste_percent = alloc == 0 ? 0.0 : | |
| 281 100.0 * waste / alloc; | |
| 282 size_t tlab_used = Universe::heap()->tlab_capacity(thrd) - | |
| 283 Universe::heap()->unsafe_max_tlab_alloc(thrd); | |
| 284 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" | |
| 285 " desired_size: " SIZE_FORMAT "KB" | |
| 286 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
| 287 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
| 288 " slow: %dB fast: %dB\n", | |
| 289 tag, thrd, thrd->osthread()->thread_id(), | |
| 290 _desired_size / (K / HeapWordSize), | |
| 291 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
| 292 _allocation_fraction.average(), | |
| 293 _allocation_fraction.average() * tlab_used / K, | |
| 294 _number_of_refills, waste_percent, | |
| 295 _gc_waste * HeapWordSize, | |
| 296 _slow_refill_waste * HeapWordSize, | |
| 297 _fast_refill_waste * HeapWordSize); | |
| 298 } | |
| 299 | |
| 300 void ThreadLocalAllocBuffer::verify() { | |
| 301 HeapWord* p = start(); | |
| 302 HeapWord* t = top(); | |
| 303 HeapWord* prev_p = NULL; | |
| 304 while (p < t) { | |
| 305 oop(p)->verify(); | |
| 306 prev_p = p; | |
| 307 p += oop(p)->size(); | |
| 308 } | |
| 309 guarantee(p == top(), "end of last object must match end of space"); | |
| 310 } | |
| 311 | |
| 312 Thread* ThreadLocalAllocBuffer::myThread() { | |
| 313 return (Thread*)(((char *)this) + | |
| 314 in_bytes(start_offset()) - | |
| 315 in_bytes(Thread::tlab_start_offset())); | |
| 316 } | |
| 317 | |
| 318 | |
| 319 GlobalTLABStats::GlobalTLABStats() : | |
| 320 _allocating_threads_avg(TLABAllocationWeight) { | |
| 321 | |
| 322 initialize(); | |
| 323 | |
| 324 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
| 325 | |
| 326 if (UsePerfData) { | |
| 327 | |
| 328 EXCEPTION_MARK; | |
| 329 ResourceMark rm; | |
| 330 | |
| 331 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
| 332 _perf_allocating_threads = | |
| 333 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 334 | |
| 335 cname = PerfDataManager::counter_name("tlab", "fills"); | |
| 336 _perf_total_refills = | |
| 337 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 338 | |
| 339 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
| 340 _perf_max_refills = | |
| 341 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 342 | |
| 343 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
| 344 _perf_allocation = | |
| 345 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 346 | |
| 347 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
| 348 _perf_gc_waste = | |
| 349 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 350 | |
| 351 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
| 352 _perf_max_gc_waste = | |
| 353 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 354 | |
| 355 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
| 356 _perf_slow_refill_waste = | |
| 357 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 358 | |
| 359 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
| 360 _perf_max_slow_refill_waste = | |
| 361 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 362 | |
| 363 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
| 364 _perf_fast_refill_waste = | |
| 365 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 366 | |
| 367 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
| 368 _perf_max_fast_refill_waste = | |
| 369 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
| 370 | |
| 371 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
| 372 _perf_slow_allocations = | |
| 373 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 374 | |
| 375 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
| 376 _perf_max_slow_allocations = | |
| 377 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
| 378 } | |
| 379 } | |
| 380 | |
| 381 void GlobalTLABStats::initialize() { | |
| 382 // Clear counters summarizing info from all threads | |
| 383 _allocating_threads = 0; | |
| 384 _total_refills = 0; | |
| 385 _max_refills = 0; | |
| 386 _total_allocation = 0; | |
| 387 _total_gc_waste = 0; | |
| 388 _max_gc_waste = 0; | |
| 389 _total_slow_refill_waste = 0; | |
| 390 _max_slow_refill_waste = 0; | |
| 391 _total_fast_refill_waste = 0; | |
| 392 _max_fast_refill_waste = 0; | |
| 393 _total_slow_allocations = 0; | |
| 394 _max_slow_allocations = 0; | |
| 395 } | |
| 396 | |
| 397 void GlobalTLABStats::publish() { | |
| 398 _allocating_threads_avg.sample(_allocating_threads); | |
| 399 if (UsePerfData) { | |
| 400 _perf_allocating_threads ->set_value(_allocating_threads); | |
| 401 _perf_total_refills ->set_value(_total_refills); | |
| 402 _perf_max_refills ->set_value(_max_refills); | |
| 403 _perf_allocation ->set_value(_total_allocation); | |
| 404 _perf_gc_waste ->set_value(_total_gc_waste); | |
| 405 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
| 406 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
| 407 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
| 408 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
| 409 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
| 410 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
| 411 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
| 412 } | |
| 413 } | |
| 414 | |
| 415 void GlobalTLABStats::print() { | |
| 416 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
| 417 double waste_percent = _total_allocation == 0 ? 0.0 : | |
| 418 100.0 * waste / _total_allocation; | |
| 419 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
| 420 " slow allocs: %d max %d waste: %4.1f%%" | |
| 421 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 422 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
| 423 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
| 424 _allocating_threads, | |
| 425 _total_refills, _max_refills, | |
| 426 _total_slow_allocations, _max_slow_allocations, | |
| 427 waste_percent, | |
| 428 _total_gc_waste * HeapWordSize, | |
| 429 _max_gc_waste * HeapWordSize, | |
| 430 _total_slow_refill_waste * HeapWordSize, | |
| 431 _max_slow_refill_waste * HeapWordSize, | |
| 432 _total_fast_refill_waste * HeapWordSize, | |
| 433 _max_fast_refill_waste * HeapWordSize); | |
| 434 } |