Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 21187:f74b9f898cf2
NodeLIRBuilder: move creation of jump from moveToPhi() to visitEndNode().
author | Josef Eisl <josef.eisl@jku.at> |
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date | Mon, 20 Apr 2015 11:56:21 +0200 |
parents | 2fd31d8e6b58 |
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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(!ZapUnusedHeapArea || 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 } |