Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 17983:57aecf00a0cd
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author | neliasso |
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date | Fri, 13 Jun 2014 08:40:35 +0000 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 060cdf93040c |
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 | |
17727 | 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(); | |
45 make_parsable(true); // also retire the TLAB | |
46 } | |
47 | |
48 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
49 global_stats()->initialize(); | |
50 | |
17727 | 51 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { |
0 | 52 thread->tlab().accumulate_statistics(); |
53 thread->tlab().initialize_statistics(); | |
54 } | |
55 | |
56 // Publish new stats if some allocation occurred. | |
57 if (global_stats()->allocation() != 0) { | |
58 global_stats()->publish(); | |
59 if (PrintTLAB) { | |
60 global_stats()->print(); | |
61 } | |
62 } | |
63 } | |
64 | |
65 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
17727 | 66 Thread* thread = myThread(); |
67 size_t capacity = Universe::heap()->tlab_capacity(thread); | |
68 size_t used = Universe::heap()->tlab_used(thread); | |
0 | 69 |
70 _gc_waste += (unsigned)remaining(); | |
17727 | 71 size_t total_allocated = thread->allocated_bytes(); |
72 size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc; | |
73 _allocated_before_last_gc = total_allocated; | |
0 | 74 |
75 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
76 print_stats("gc"); | |
77 } | |
78 | |
79 if (_number_of_refills > 0) { | |
17727 | 80 // Update allocation history if a reasonable amount of eden was allocated. |
81 bool update_allocation_history = used > 0.5 * capacity; | |
0 | 82 |
83 if (update_allocation_history) { | |
84 // Average the fraction of eden allocated in a tlab by this | |
85 // thread for use in the next resize operation. | |
86 // _gc_waste is not subtracted because it's included in | |
87 // "used". | |
17727 | 88 // The result can be larger than 1.0 due to direct to old allocations. |
89 // These allocations should ideally not be counted but since it is not possible | |
90 // to filter them out here we just cap the fraction to be at most 1.0. | |
91 double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used); | |
0 | 92 _allocation_fraction.sample(alloc_frac); |
93 } | |
94 global_stats()->update_allocating_threads(); | |
95 global_stats()->update_number_of_refills(_number_of_refills); | |
96 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
97 global_stats()->update_gc_waste(_gc_waste); | |
98 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
99 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
100 | |
101 } else { | |
102 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && | |
103 _slow_refill_waste == 0 && _gc_waste == 0, | |
104 "tlab stats == 0"); | |
105 } | |
106 global_stats()->update_slow_allocations(_slow_allocations); | |
107 } | |
108 | |
109 // Fills the current tlab with a dummy filler array to create | |
110 // an illusion of a contiguous Eden and optionally retires the tlab. | |
111 // Waste accounting should be done in caller as appropriate; see, | |
112 // for example, clear_before_allocation(). | |
113 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
114 if (end() != NULL) { | |
115 invariants(); | |
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116 |
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117 if (retire) { |
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118 myThread()->incr_allocated_bytes(used_bytes()); |
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119 } |
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120 |
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121 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
0 | 122 |
123 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
124 set_start(NULL); | |
125 set_top(NULL); | |
126 set_pf_top(NULL); | |
127 set_end(NULL); | |
128 } | |
129 } | |
130 assert(!(retire || ZeroTLAB) || | |
131 (start() == NULL && end() == NULL && top() == NULL), | |
132 "TLAB must be reset"); | |
133 } | |
134 | |
135 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
17727 | 136 if (ResizeTLAB) { |
137 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
138 thread->tlab().resize(); | |
139 } | |
0 | 140 } |
141 } | |
142 | |
143 void ThreadLocalAllocBuffer::resize() { | |
17727 | 144 // Compute the next tlab size using expected allocation amount |
145 assert(ResizeTLAB, "Should not call this otherwise"); | |
146 size_t alloc = (size_t)(_allocation_fraction.average() * | |
147 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
148 size_t new_size = alloc / _target_refills; | |
0 | 149 |
17727 | 150 new_size = MIN2(MAX2(new_size, min_size()), max_size()); |
0 | 151 |
17727 | 152 size_t aligned_new_size = align_object_size(new_size); |
0 | 153 |
17727 | 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); | |
0 | 159 } |
17727 | 160 set_desired_size(aligned_new_size); |
161 set_refill_waste_limit(initial_refill_waste_limit()); | |
0 | 162 } |
163 | |
164 void ThreadLocalAllocBuffer::initialize_statistics() { | |
165 _number_of_refills = 0; | |
166 _fast_refill_waste = 0; | |
167 _slow_refill_waste = 0; | |
168 _gc_waste = 0; | |
169 _slow_allocations = 0; | |
170 } | |
171 | |
172 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
173 HeapWord* top, | |
174 size_t new_size) { | |
175 _number_of_refills++; | |
176 if (PrintTLAB && Verbose) { | |
177 print_stats("fill"); | |
178 } | |
179 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
180 initialize(start, top, start + new_size - alignment_reserve()); | |
181 | |
182 // Reset amount of internal fragmentation | |
183 set_refill_waste_limit(initial_refill_waste_limit()); | |
184 } | |
185 | |
186 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
187 HeapWord* top, | |
188 HeapWord* end) { | |
189 set_start(start); | |
190 set_top(top); | |
191 set_pf_top(top); | |
192 set_end(end); | |
193 invariants(); | |
194 } | |
195 | |
196 void ThreadLocalAllocBuffer::initialize() { | |
197 initialize(NULL, // start | |
198 NULL, // top | |
199 NULL); // end | |
200 | |
201 set_desired_size(initial_desired_size()); | |
202 | |
203 // Following check is needed because at startup the main (primordial) | |
204 // thread is initialized before the heap is. The initialization for | |
205 // this thread is redone in startup_initialization below. | |
206 if (Universe::heap() != NULL) { | |
207 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
208 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
209 _allocation_fraction.sample(alloc_frac); | |
210 } | |
211 | |
212 set_refill_waste_limit(initial_refill_waste_limit()); | |
213 | |
214 initialize_statistics(); | |
215 } | |
216 | |
217 void ThreadLocalAllocBuffer::startup_initialization() { | |
218 | |
219 // Assuming each thread's active tlab is, on average, | |
220 // 1/2 full at a GC | |
221 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
222 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
223 | |
224 _global_stats = new GlobalTLABStats(); | |
225 | |
226 // During jvm startup, the main (primordial) thread is initialized | |
227 // before the heap is initialized. So reinitialize it now. | |
228 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
229 Thread::current()->tlab().initialize(); | |
230 | |
231 if (PrintTLAB && Verbose) { | |
232 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
233 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
234 } | |
235 } | |
236 | |
237 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
238 size_t init_sz; | |
239 | |
240 if (TLABSize > 0) { | |
241 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
242 } else if (global_stats() == NULL) { | |
243 // Startup issue - main thread initialized before heap initialized. | |
244 init_sz = min_size(); | |
245 } else { | |
246 // Initial size is a function of the average number of allocating threads. | |
247 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
248 | |
249 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
250 (nof_threads * target_refills()); | |
251 init_sz = align_object_size(init_sz); | |
252 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
253 } | |
254 return init_sz; | |
255 } | |
256 | |
257 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
258 Thread* thrd = myThread(); | |
259 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
260 size_t alloc = _number_of_refills * _desired_size; | |
261 double waste_percent = alloc == 0 ? 0.0 : | |
262 100.0 * waste / alloc; | |
17727 | 263 size_t tlab_used = Universe::heap()->tlab_used(thrd); |
0 | 264 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" |
265 " desired_size: " SIZE_FORMAT "KB" | |
266 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
267 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
268 " slow: %dB fast: %dB\n", | |
269 tag, thrd, thrd->osthread()->thread_id(), | |
270 _desired_size / (K / HeapWordSize), | |
271 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
272 _allocation_fraction.average(), | |
273 _allocation_fraction.average() * tlab_used / K, | |
274 _number_of_refills, waste_percent, | |
275 _gc_waste * HeapWordSize, | |
276 _slow_refill_waste * HeapWordSize, | |
277 _fast_refill_waste * HeapWordSize); | |
278 } | |
279 | |
280 void ThreadLocalAllocBuffer::verify() { | |
281 HeapWord* p = start(); | |
282 HeapWord* t = top(); | |
283 HeapWord* prev_p = NULL; | |
284 while (p < t) { | |
285 oop(p)->verify(); | |
286 prev_p = p; | |
287 p += oop(p)->size(); | |
288 } | |
289 guarantee(p == top(), "end of last object must match end of space"); | |
290 } | |
291 | |
292 Thread* ThreadLocalAllocBuffer::myThread() { | |
293 return (Thread*)(((char *)this) + | |
294 in_bytes(start_offset()) - | |
295 in_bytes(Thread::tlab_start_offset())); | |
296 } | |
297 | |
298 | |
299 GlobalTLABStats::GlobalTLABStats() : | |
300 _allocating_threads_avg(TLABAllocationWeight) { | |
301 | |
302 initialize(); | |
303 | |
304 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
305 | |
306 if (UsePerfData) { | |
307 | |
308 EXCEPTION_MARK; | |
309 ResourceMark rm; | |
310 | |
311 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
312 _perf_allocating_threads = | |
313 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
314 | |
315 cname = PerfDataManager::counter_name("tlab", "fills"); | |
316 _perf_total_refills = | |
317 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
318 | |
319 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
320 _perf_max_refills = | |
321 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
322 | |
323 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
324 _perf_allocation = | |
325 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
326 | |
327 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
328 _perf_gc_waste = | |
329 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
330 | |
331 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
332 _perf_max_gc_waste = | |
333 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
334 | |
335 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
336 _perf_slow_refill_waste = | |
337 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
338 | |
339 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
340 _perf_max_slow_refill_waste = | |
341 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
342 | |
343 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
344 _perf_fast_refill_waste = | |
345 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
346 | |
347 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
348 _perf_max_fast_refill_waste = | |
349 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
350 | |
351 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
352 _perf_slow_allocations = | |
353 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
354 | |
355 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
356 _perf_max_slow_allocations = | |
357 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
358 } | |
359 } | |
360 | |
361 void GlobalTLABStats::initialize() { | |
362 // Clear counters summarizing info from all threads | |
363 _allocating_threads = 0; | |
364 _total_refills = 0; | |
365 _max_refills = 0; | |
366 _total_allocation = 0; | |
367 _total_gc_waste = 0; | |
368 _max_gc_waste = 0; | |
369 _total_slow_refill_waste = 0; | |
370 _max_slow_refill_waste = 0; | |
371 _total_fast_refill_waste = 0; | |
372 _max_fast_refill_waste = 0; | |
373 _total_slow_allocations = 0; | |
374 _max_slow_allocations = 0; | |
375 } | |
376 | |
377 void GlobalTLABStats::publish() { | |
378 _allocating_threads_avg.sample(_allocating_threads); | |
379 if (UsePerfData) { | |
380 _perf_allocating_threads ->set_value(_allocating_threads); | |
381 _perf_total_refills ->set_value(_total_refills); | |
382 _perf_max_refills ->set_value(_max_refills); | |
383 _perf_allocation ->set_value(_total_allocation); | |
384 _perf_gc_waste ->set_value(_total_gc_waste); | |
385 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
386 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
387 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
388 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
389 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
390 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
391 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
392 } | |
393 } | |
394 | |
395 void GlobalTLABStats::print() { | |
396 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
397 double waste_percent = _total_allocation == 0 ? 0.0 : | |
398 100.0 * waste / _total_allocation; | |
399 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
400 " slow allocs: %d max %d waste: %4.1f%%" | |
401 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
402 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
403 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
404 _allocating_threads, | |
405 _total_refills, _max_refills, | |
406 _total_slow_allocations, _max_slow_allocations, | |
407 waste_percent, | |
408 _total_gc_waste * HeapWordSize, | |
409 _max_gc_waste * HeapWordSize, | |
410 _total_slow_refill_waste * HeapWordSize, | |
411 _max_slow_refill_waste * HeapWordSize, | |
412 _total_fast_refill_waste * HeapWordSize, | |
413 _max_fast_refill_waste * HeapWordSize); | |
414 } |