Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 18777:76cbf5f33f82
Truffle-DSL: fixed bug for polymorphic execute optimization.
author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 05 Jan 2015 02:38:44 +0100 |
parents | ee26b8eb1601 |
children | 8f2fb6bec986 |
rev | line source |
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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 } |