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annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 14521:29ccc4cbabca
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author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 12 Mar 2014 13:30:08 +0100 |
parents | d8041d695d19 |
children | 4ca6dc0799b6 |
rev | line source |
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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" | |
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31 #include "runtime/thread.inline.hpp" |
1972 | 32 #include "utilities/copy.hpp" |
0 | 33 |
1972 | 34 // Thread-Local Edens support |
0 | 35 |
36 // static member initialization | |
14310 | 37 size_t ThreadLocalAllocBuffer::_max_size = 0; |
0 | 38 unsigned ThreadLocalAllocBuffer::_target_refills = 0; |
39 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL; | |
40 | |
41 void ThreadLocalAllocBuffer::clear_before_allocation() { | |
42 _slow_refill_waste += (unsigned)remaining(); | |
43 make_parsable(true); // also retire the TLAB | |
44 } | |
45 | |
46 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
47 global_stats()->initialize(); | |
48 | |
14310 | 49 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { |
0 | 50 thread->tlab().accumulate_statistics(); |
51 thread->tlab().initialize_statistics(); | |
52 } | |
53 | |
54 // Publish new stats if some allocation occurred. | |
55 if (global_stats()->allocation() != 0) { | |
56 global_stats()->publish(); | |
57 if (PrintTLAB) { | |
58 global_stats()->print(); | |
59 } | |
60 } | |
61 } | |
62 | |
63 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
14310 | 64 Thread* thread = myThread(); |
65 size_t capacity = Universe::heap()->tlab_capacity(thread); | |
66 size_t used = Universe::heap()->tlab_used(thread); | |
0 | 67 |
68 _gc_waste += (unsigned)remaining(); | |
14310 | 69 size_t total_allocated = thread->allocated_bytes(); |
70 size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc; | |
71 _allocated_before_last_gc = total_allocated; | |
0 | 72 |
73 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
74 print_stats("gc"); | |
75 } | |
76 | |
77 if (_number_of_refills > 0) { | |
14310 | 78 // Update allocation history if a reasonable amount of eden was allocated. |
79 bool update_allocation_history = used > 0.5 * capacity; | |
0 | 80 |
81 if (update_allocation_history) { | |
82 // Average the fraction of eden allocated in a tlab by this | |
83 // thread for use in the next resize operation. | |
84 // _gc_waste is not subtracted because it's included in | |
85 // "used". | |
14310 | 86 // The result can be larger than 1.0 due to direct to old allocations. |
87 // These allocations should ideally not be counted but since it is not possible | |
88 // to filter them out here we just cap the fraction to be at most 1.0. | |
89 double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used); | |
0 | 90 _allocation_fraction.sample(alloc_frac); |
91 } | |
92 global_stats()->update_allocating_threads(); | |
93 global_stats()->update_number_of_refills(_number_of_refills); | |
94 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
95 global_stats()->update_gc_waste(_gc_waste); | |
96 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
97 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
98 | |
99 } else { | |
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100 // (ds) _gc_waste can be non-zero (see above) even if _number_of_refills is 0 |
0 | 101 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && |
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102 _slow_refill_waste == 0/* && _gc_waste == 0*/, |
0 | 103 "tlab stats == 0"); |
104 } | |
105 global_stats()->update_slow_allocations(_slow_allocations); | |
106 } | |
107 | |
108 // Fills the current tlab with a dummy filler array to create | |
109 // an illusion of a contiguous Eden and optionally retires the tlab. | |
110 // Waste accounting should be done in caller as appropriate; see, | |
111 // for example, clear_before_allocation(). | |
112 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
113 if (end() != NULL) { | |
114 invariants(); | |
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115 |
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116 if (retire) { |
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117 myThread()->incr_allocated_bytes(used_bytes()); |
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118 } |
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119 |
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120 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
0 | 121 |
122 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
123 set_start(NULL); | |
124 set_top(NULL); | |
125 set_pf_top(NULL); | |
126 set_end(NULL); | |
127 } | |
128 } | |
129 assert(!(retire || ZeroTLAB) || | |
130 (start() == NULL && end() == NULL && top() == NULL), | |
131 "TLAB must be reset"); | |
132 } | |
133 | |
134 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
14310 | 135 if (ResizeTLAB) { |
136 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
137 thread->tlab().resize(); | |
138 } | |
0 | 139 } |
140 } | |
141 | |
142 void ThreadLocalAllocBuffer::resize() { | |
14310 | 143 // Compute the next tlab size using expected allocation amount |
144 assert(ResizeTLAB, "Should not call this otherwise"); | |
145 size_t alloc = (size_t)(_allocation_fraction.average() * | |
146 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
147 size_t new_size = alloc / _target_refills; | |
0 | 148 |
14310 | 149 new_size = MIN2(MAX2(new_size, min_size()), max_size()); |
0 | 150 |
14310 | 151 size_t aligned_new_size = align_object_size(new_size); |
0 | 152 |
14310 | 153 if (PrintTLAB && Verbose) { |
154 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
155 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
156 myThread(), myThread()->osthread()->thread_id(), | |
157 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
0 | 158 } |
14310 | 159 set_desired_size(aligned_new_size); |
160 set_refill_waste_limit(initial_refill_waste_limit()); | |
0 | 161 } |
162 | |
163 void ThreadLocalAllocBuffer::initialize_statistics() { | |
164 _number_of_refills = 0; | |
165 _fast_refill_waste = 0; | |
166 _slow_refill_waste = 0; | |
167 _gc_waste = 0; | |
168 _slow_allocations = 0; | |
169 } | |
170 | |
171 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
172 HeapWord* top, | |
173 size_t new_size) { | |
174 _number_of_refills++; | |
175 if (PrintTLAB && Verbose) { | |
176 print_stats("fill"); | |
177 } | |
178 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
179 initialize(start, top, start + new_size - alignment_reserve()); | |
180 | |
181 // Reset amount of internal fragmentation | |
182 set_refill_waste_limit(initial_refill_waste_limit()); | |
183 } | |
184 | |
185 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
186 HeapWord* top, | |
187 HeapWord* end) { | |
188 set_start(start); | |
189 set_top(top); | |
190 set_pf_top(top); | |
191 set_end(end); | |
192 invariants(); | |
193 } | |
194 | |
195 void ThreadLocalAllocBuffer::initialize() { | |
196 initialize(NULL, // start | |
197 NULL, // top | |
198 NULL); // end | |
199 | |
200 set_desired_size(initial_desired_size()); | |
201 | |
202 // Following check is needed because at startup the main (primordial) | |
203 // thread is initialized before the heap is. The initialization for | |
204 // this thread is redone in startup_initialization below. | |
205 if (Universe::heap() != NULL) { | |
206 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
207 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
208 _allocation_fraction.sample(alloc_frac); | |
209 } | |
210 | |
211 set_refill_waste_limit(initial_refill_waste_limit()); | |
212 | |
213 initialize_statistics(); | |
214 } | |
215 | |
216 void ThreadLocalAllocBuffer::startup_initialization() { | |
217 | |
218 // Assuming each thread's active tlab is, on average, | |
219 // 1/2 full at a GC | |
220 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
221 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
222 | |
223 _global_stats = new GlobalTLABStats(); | |
224 | |
225 // During jvm startup, the main (primordial) thread is initialized | |
226 // before the heap is initialized. So reinitialize it now. | |
227 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
228 Thread::current()->tlab().initialize(); | |
229 | |
230 if (PrintTLAB && Verbose) { | |
231 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
232 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
233 } | |
234 } | |
235 | |
236 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
237 size_t init_sz; | |
238 | |
239 if (TLABSize > 0) { | |
240 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
241 } else if (global_stats() == NULL) { | |
242 // Startup issue - main thread initialized before heap initialized. | |
243 init_sz = min_size(); | |
244 } else { | |
245 // Initial size is a function of the average number of allocating threads. | |
246 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
247 | |
248 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
249 (nof_threads * target_refills()); | |
250 init_sz = align_object_size(init_sz); | |
251 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
252 } | |
253 return init_sz; | |
254 } | |
255 | |
256 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
257 Thread* thrd = myThread(); | |
258 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
259 size_t alloc = _number_of_refills * _desired_size; | |
260 double waste_percent = alloc == 0 ? 0.0 : | |
261 100.0 * waste / alloc; | |
14310 | 262 size_t tlab_used = Universe::heap()->tlab_used(thrd); |
0 | 263 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" |
264 " desired_size: " SIZE_FORMAT "KB" | |
265 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
266 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
267 " slow: %dB fast: %dB\n", | |
268 tag, thrd, thrd->osthread()->thread_id(), | |
269 _desired_size / (K / HeapWordSize), | |
270 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
271 _allocation_fraction.average(), | |
272 _allocation_fraction.average() * tlab_used / K, | |
273 _number_of_refills, waste_percent, | |
274 _gc_waste * HeapWordSize, | |
275 _slow_refill_waste * HeapWordSize, | |
276 _fast_refill_waste * HeapWordSize); | |
277 } | |
278 | |
279 void ThreadLocalAllocBuffer::verify() { | |
280 HeapWord* p = start(); | |
281 HeapWord* t = top(); | |
282 HeapWord* prev_p = NULL; | |
283 while (p < t) { | |
284 oop(p)->verify(); | |
285 prev_p = p; | |
286 p += oop(p)->size(); | |
287 } | |
288 guarantee(p == top(), "end of last object must match end of space"); | |
289 } | |
290 | |
291 Thread* ThreadLocalAllocBuffer::myThread() { | |
292 return (Thread*)(((char *)this) + | |
293 in_bytes(start_offset()) - | |
294 in_bytes(Thread::tlab_start_offset())); | |
295 } | |
296 | |
297 | |
298 GlobalTLABStats::GlobalTLABStats() : | |
299 _allocating_threads_avg(TLABAllocationWeight) { | |
300 | |
301 initialize(); | |
302 | |
303 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
304 | |
305 if (UsePerfData) { | |
306 | |
307 EXCEPTION_MARK; | |
308 ResourceMark rm; | |
309 | |
310 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
311 _perf_allocating_threads = | |
312 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
313 | |
314 cname = PerfDataManager::counter_name("tlab", "fills"); | |
315 _perf_total_refills = | |
316 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
317 | |
318 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
319 _perf_max_refills = | |
320 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
321 | |
322 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
323 _perf_allocation = | |
324 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
325 | |
326 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
327 _perf_gc_waste = | |
328 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
329 | |
330 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
331 _perf_max_gc_waste = | |
332 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
333 | |
334 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
335 _perf_slow_refill_waste = | |
336 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
337 | |
338 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
339 _perf_max_slow_refill_waste = | |
340 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
341 | |
342 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
343 _perf_fast_refill_waste = | |
344 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
345 | |
346 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
347 _perf_max_fast_refill_waste = | |
348 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
349 | |
350 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
351 _perf_slow_allocations = | |
352 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
353 | |
354 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
355 _perf_max_slow_allocations = | |
356 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
357 } | |
358 } | |
359 | |
360 void GlobalTLABStats::initialize() { | |
361 // Clear counters summarizing info from all threads | |
362 _allocating_threads = 0; | |
363 _total_refills = 0; | |
364 _max_refills = 0; | |
365 _total_allocation = 0; | |
366 _total_gc_waste = 0; | |
367 _max_gc_waste = 0; | |
368 _total_slow_refill_waste = 0; | |
369 _max_slow_refill_waste = 0; | |
370 _total_fast_refill_waste = 0; | |
371 _max_fast_refill_waste = 0; | |
372 _total_slow_allocations = 0; | |
373 _max_slow_allocations = 0; | |
374 } | |
375 | |
376 void GlobalTLABStats::publish() { | |
377 _allocating_threads_avg.sample(_allocating_threads); | |
378 if (UsePerfData) { | |
379 _perf_allocating_threads ->set_value(_allocating_threads); | |
380 _perf_total_refills ->set_value(_total_refills); | |
381 _perf_max_refills ->set_value(_max_refills); | |
382 _perf_allocation ->set_value(_total_allocation); | |
383 _perf_gc_waste ->set_value(_total_gc_waste); | |
384 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
385 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
386 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
387 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
388 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
389 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
390 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
391 } | |
392 } | |
393 | |
394 void GlobalTLABStats::print() { | |
395 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
396 double waste_percent = _total_allocation == 0 ? 0.0 : | |
397 100.0 * waste / _total_allocation; | |
398 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
399 " slow allocs: %d max %d waste: %4.1f%%" | |
400 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
401 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
402 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
403 _allocating_threads, | |
404 _total_refills, _max_refills, | |
405 _total_slow_allocations, _max_slow_allocations, | |
406 waste_percent, | |
407 _total_gc_waste * HeapWordSize, | |
408 _max_gc_waste * HeapWordSize, | |
409 _total_slow_refill_waste * HeapWordSize, | |
410 _max_slow_refill_waste * HeapWordSize, | |
411 _total_fast_refill_waste * HeapWordSize, | |
412 _max_fast_refill_waste * HeapWordSize); | |
413 } |